MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC.

Depositor

OPTION ONE MORTGAGE CORPORATION

Master Servicer

and

WELLS FARGO BANK, N.A.

Trustee

POOLING AND SERVICING AGREEMENT

Dated as of May 1, 2005

MASTR Asset Backed Securities Trust 2005-OPT1

Mortgage Pass-Through Certificates

Series 2005-OPT1

TABLE OF CONTENTS

ARTICLE I DEFINITIONS

Section 1.01.	Defined Terms.
Section 1.02.	Allocation of Certain Interest Shortfalls.
Section 1.03.	Rights of the NIMS Insurer.

ARTICLE II CONVEYANCE OF MORTGAGE LOANS; ORIGINAL ISSUANCE OF CERTIFICATES

Section 2.01.	Conveyance of the Mortgage Loans.
Section 2.02.	Acceptance of REMIC I by Trustee.
Section 2.03.	Repurchase or Substitution of Mortgage Loans by the Originator or the Seller.
Section 2.04.	Reserved.
Section 2.05.	Representations, Warranties and Covenants of the Master Servicer.
Section 2.06.	Issuance of the REMIC I Regular Interests and the Class R-I Interest.
Section 2.07.	Conveyance of REMIC Regular Interests and Acceptance of REMIC I, REMIC II, REMIC III and REMIC IV by the Trustee.
Section 2.08.	Issuance of Class R Certificates and the Class R-X Certificates.

ARTICLE III ADMINISTRATION AND SERVICING OF THE MORTGAGE LOANS

Section 3.01.

Master Servicer to Act as Master Servicer.

Section 3.02.

Sub-Servicing Agreements Between Master Servicer and Sub-Servicers.

Section 3.03.

Successor Sub-Servicers.

Section 3.04.

Liability of the Master Servicer.

Section 3.05.

No Contractual Relationship Between Sub-Servicers and the NIMS Insurer, the Trustee or Certificateholders.

Section 3.06.

Assumption or Termination of Sub-Servicing Agreements by Trustee.

Section 3.07.

Collection of Certain Mortgage Loan Payments.

Section 3.08.

Sub-Servicing Accounts.

Section 3.09.

Collection of Taxes, Assessments and Similar Items; Servicing Accounts.

Section 3.10.

Collection Account and Distribution Account.

Section 3.11.

Withdrawals from the Collection Account and Distribution Account.

Section 3.12.

Investment of Funds in the Collection Account and the Distribution Account.

Section 3.13.

[Reserved].

Section 3.14.

Maintenance of Hazard Insurance and Errors and Omissions and Fidelity Coverage.

Section 3.15.

Enforcement of Due-On-Sale Clauses; Assumption Agreements.

Section 3.16.

Realization Upon Defaulted Mortgage Loans.

Section 3.17.

Trustee to Cooperate; Release of Mortgage Files.

Section 3.18.

Servicing Compensation.

Section 3.19.

Reports to the Trustee; Collection Account Statements.

Section 3.20.

Statement as to Compliance.

Section 3.21.

Independent Public Accountants’ Servicing Report.

Section 3.22.

Access to Certain Documentation.

Section 3.23.

Title, Management and Disposition of REO Property.

Section 3.24.

Obligations of the Master Servicer in Respect of Prepayment Interest Shortfalls.

Section 3.25.

[Reserved].

Section 3.26.	Obligations of the Master Servicer in Respect of Mortgage Rates and Monthly Payments.
Section 3.27.	Solicitations.
Section 3.28.	Net WAC Rate Carryover Reserve Account.
Section 3.29.	Advance Facility
Section 3.30.	PMI Policies; Claims under the PMI Policies.

ARTICLE IV PAYMENTS TO CERTIFICATEHOLDERS

Section 4.01.	Distributions.
Section 4.02.	Statements to Certificateholders.
Section 4.03.	Remittance Reports; Advances.
Section 4.04.	Allocation of Realized Losses.
Section 4.05.	Compliance with Withholding Requirements.
Section 4.06.	Exchange Commission; Additional Information.

ARTICLE V THE CERTIFICATES

Section 5.01.	The Certificates.
Section 5.02.	Registration of Transfer and Exchange of Certificates.
Section 5.03.	Mutilated, Destroyed, Lost or Stolen Certificates.
Section 5.04.	Persons Deemed Owners.
Section 5.05.	Certain Available Information.

ARTICLE VI THE DEPOSITOR AND THE MASTER SERVICER

Section 6.01.	Liability of the Depositor and the Master Servicer.
Section 6.02.	Merger or Consolidation of the Depositor or the Master Servicer.
Section 6.03.	Limitation on Liability of the Depositor, the Master Servicer and Others.
Section 6.04.	Limitation on Resignation of the Master Servicer.
Section 6.05.	Rights of the Depositor in Respect of the Master Servicer.
Section 6.06.	[Reserved].

ARTICLE VII DEFAULT

Section 7.01.	Master Servicer Events of Default.
Section 7.02.	Trustee to Act; Appointment of Successor.
Section 7.03.	Notification to Certificateholders.
Section 7.04.	Waiver of Master Servicer Events of Default.
Section 7.05.	Survivability of Master Servicer Liabilities.

ARTICLE VIII CONCERNING THE TRUSTEE

Section 8.01.	Duties of Trustee.
Section 8.02.	Certain Matters Affecting the Trustee.
Section 8.03.	Trustee not Liable for Certificates or Mortgage Loans.
Section 8.04.	Trustee May Own Certificates.
Section 8.05.	Trustee’s Fees and Expenses.
Section 8.06.	Eligibility Requirements for Trustee.
Section 8.07.	Resignation and Removal of the Trustee.
Section 8.08.	Successor Trustee.
Section 8.09.	Merger or Consolidation of Trustee.

Section 8.10.	Appointment of Co-Trustee or Separate Trustee.
Section 8.11.	Appointment of Office or Agency.
Section 8.12.	Representations and Warranties.

ARTICLE IX TERMINATION

Section 9.01.	Termination Upon Repurchase or Liquidation of All Mortgage Loans.
Section 9.02.	Additional Termination Requirements.

ARTICLE X REMIC PROVISIONS

Section 10.01.	REMIC Administration.
Section 10.02.	Prohibited Transactions and Activities.
Section 10.03.	Master Servicer and Trustee Indemnification.

ARTICLE XI MISCELLANEOUS PROVISIONS

Section 11.01.	Amendment.
Section 11.02.	Recordation of Agreement; Counterparts.
Section 11.03.	Limitation on Rights of Certificateholders.
Section 11.04.	Governing Law.
Section 11.05.	Notices.
Section 11.06.	Severability of Provisions.
Section 11.07.	Notice to Rating Agencies and the NIMS Insurer.
Section 11.08.	Article and Section References.
Section 11.09.	Grant of Security Interest.
Section 11.10.	Third Party Rights.

Exhibits

Exhibit A-1

Form of Class A-1 Certificate

Exhibit A-2

Form of Class A-2 Certificate

Exhibit A-3

Form of Class A-3 Certificate

Exhibit A-4

Form of Class A-4 Certificate

Exhibit A-5

Form of Class A-5 Certificate

Exhibit A-6

Form of Class M-1 Certificate

Exhibit A-7

Form of Class M-2 Certificate

Exhibit A-8

Form of Class M-3 Certificate

Exhibit A-9

Form of Class M-4 Certificate

Exhibit A-10

Form of Class M-5 Certificate

Exhibit A-11

Form of Class M-6 Certificate

Exhibit A-12

Form of Class M-7 Certificate

Exhibit A-13

Form of Class M-8 Certificate

Exhibit A-14

Form of Class M-9 Certificate

Exhibit A-15

Form of Class M-10 Certificate

Exhibit A-16

Form of Class M-11 Certificate

Exhibit A-17

Form of Class CE Certificate

Exhibit A-18

Form of Class P Certificate

Exhibit A-19

Form of Class R Certificate

Exhibit A-20

Form of Class R-X Certificate

Exhibit B

[Reserved]

Exhibit C-1

Form of Trustee’s Initial Certification

Exhibit C-2

Form of Trustee’s Final Certification

Exhibit C-3

Form of Trustee’s Receipt of Mortgage Notes

Exhibit D

Form of Mortgage Loan Purchase Agreement

Exhibit E

Request for Release

Exhibit F-1

Form of Transferor Representation Letter and Form of Transferee Representation Letter in Connection with Transfer of the Class CE Certificates, Class P Certificates or Residual Certificates Pursuant to Rule 144A Under the 1933 Act

Exhibit F-2

Form of Transfer Affidavit and Agreement and Form of Transferor Affidavit in Connection with Transfer of Residual Certificates

Exhibit G

Form of Certification with respect to ERISA and the Code

Exhibit H

Form of Report Pursuant to Section 4.06

Exhibit I

Form of Lost Note Affidavit

Exhibit J-1

Form of Certification to Be Provided by the Master Servicer with Form 10-K

Exhibit J-2

Form of Certification to Be Provided by the Trustee with Form 10-K

Exhibit K

[Reserved]

Exhibit L

Form of Cap Contracts

Schedule 1

Mortgage Loan Schedule

Schedule 2

Prepayment Charge Schedule

Schedule 3

PMI Mortgage Loans

This Pooling and Servicing Agreement, is dated and effective as of May 1, 2005, among MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC. as Depositor, OPTION ONE MORTGAGE CORPORATION as Master Servicer and WELLS FARGO BANK, N.A. as Trustee.

PRELIMINARY STATEMENT:

The Depositor intends to sell pass-through certificates to be issued hereunder in multiple classes, which in the aggregate will evidence the entire beneficial ownership interest in each REMIC (as defined herein) created hereunder. The Trust Fund will consist of a segregated pool of assets comprised of the Mortgage Loans and certain other related assets subject to this Agreement.

REMIC I

As provided herein, the Trustee will elect to treat the segregated pool of assets consisting of the Mortgage Loans and certain other related assets (other than the Master Servicer Prepayment Charge Payment Amount, the Net WAC Rate Carryover Reserve Account and the Cap Contracts) subject to this Agreement as a REMIC for federal income tax purposes, and such segregated pool of assets will be designated as “REMIC I.” The Class R-I Interest will be the sole class of “residual interests” in REMIC I for purposes of the REMIC Provisions (as defined herein). The following table irrevocably sets forth the designation, the REMIC I Remittance Rate, the initial Uncertificated Balance and, for purposes of satisfying Treasury regulation section 1.860G-1(a)(4)(iii), the “latest possible maturity date” for each of the REMIC I Regular Interests (as defined herein). None of the REMIC I Regular Interests will be certificated.

Designation	REMIC I Remittance Rate	Initial Uncertificated Balance ($)	Latest Possible Maturity Date⁽¹⁾
I-LTAA	Variable⁽²⁾	785,171,068.17	March 25, 2035
I-LTA1	Variable⁽²⁾	3,334,050.00	March 25, 2035
I-LTA2	Variable⁽²⁾	370,455.00	March 25, 2035
I-LTA3	Variable⁽²⁾	1,583,060.00	March 25, 2035
I-LTA4	Variable⁽²⁾	1,238,450.00	March 25, 2035
I-LTA5	Variable⁽²⁾	228,060.00	March 25, 2035
I-LTM1	Variable⁽²⁾	232,345.00	March 25, 2035
I-LTM2	Variable⁽²⁾	188,280.00	March 25, 2035
I-LTM3	Variable⁽²⁾	124,185.00	March 25, 2035
I-LTM4	Variable⁽²⁾	196,295.00	March 25, 2035
I-LTM5	Variable⁽²⁾	68,100.00	March 25, 2035
I-LTM6	Variable⁽²⁾	76,115.00	March 25, 2035
I-LTM7	Variable⁽²⁾	92,135.00	March 25, 2035
I-LTM8	Variable⁽²⁾	72,110.00	March 25, 2035
I-LTM9	Variable⁽²⁾	76,115.00	March 25, 2035
I-LTM10	Variable⁽²⁾	40,060.00	March 25, 2035
I-LTM11	Variable⁽²⁾	36,055.00	March 25, 2035
I-LTP	Variable⁽²⁾	100.00	March 25, 2035
I-LTZZ	Variable⁽²⁾	8,068,029.35	March 25, 2035
I-1SUB	Variable⁽²⁾	13,798.51	March 25, 2035
I-1GRP	Variable⁽²⁾	87,888.62	March 25, 2035
I-2SUB	Variable⁽²⁾	11,358.98	March 25, 2035
I-2GRP	Variable⁽²⁾	72,350.38	March 25, 2035
I-XX	Variable⁽²⁾	801,009,571.02	March 25, 2035

________________

⁽¹⁾	For purposes of Section 1.860G-1(a)(4)(iii) of the Treasury regulations, the Distribution Date immediately following the maturity date for the Mortgage Loan with the latest maturity date has been designated as the “latest possible maturity date” for each REMIC I Regular Interest.
⁽²⁾	Calculated in accordance with the definition of “REMIC I Remittance Rate” herein.

REMIC II

As provided herein, the Trustee will elect to treat the segregated pool of assets consisting of the REMIC I Regular Interests as a REMIC for federal income tax purposes, and such segregated pool of assets will be designated as “REMIC II.” The Class R-II Interest will evidence the sole class of “residual interests” in REMIC II for purposes of the REMIC Provisions under federal income tax law. The following table irrevocably sets forth the designation, the Pass-Through Rate, the initial aggregate Certificate Principal Balance and, for purposes of satisfying Treasury regulation section 1.860G-1(a)(4)(iii), the “latest possible maturity date” for the indicated Classes of Certificates.

Designation	Pass-Through Rate	Initial Aggregate Certificate Principal Balance ($)	Latest Possible Maturity Date⁽¹⁾
Class A-1	Variable⁽²⁾	666,810,000.00	March 25, 2035
Class A-2	Variable⁽²⁾	74,091,000.00	March 25, 2035
Class A-3	Variable⁽²⁾	316,612,000.00	March 25, 2035
Class A-4	Variable⁽²⁾	247,690,000.00	March 25, 2035
Class A-5	Variable⁽²⁾	45,612,000.00	March 25, 2035
Class M-1	Variable⁽²⁾	46,469,000.00	March 25, 2035
Class M-2	Variable⁽²⁾	37,656,000.00	March 25, 2035
Class M-3	Variable⁽²⁾	24,837,000.00	March 25, 2035
Class M-4	Variable⁽²⁾	39,259,000.00	March 25, 2035
Class M-5	Variable⁽²⁾	13,620,000.00	March 25, 2035
Class M-6	Variable⁽²⁾	15,223,000.00	March 25, 2035
Class M-7	Variable⁽²⁾	18,427,000.00	March 25, 2035
Class M-8	Variable⁽²⁾	14,422,000.00	March 25, 2035
Class M-9	Variable⁽²⁾	15,223,000.00	March 25, 2035
Class M-10	Variable⁽²⁾	8,012,000.00	March 25, 2035
Class M-11	Variable⁽²⁾	7,211,000.00	March 25, 2035
Class CE Interest	Variable⁽²⁾	11,215,935.04	March 25, 2035
Class P Interest	N/A⁽⁴⁾	100.00	March 25, 2035

_______________

⁽¹⁾	For purposes of Section 1.860G-1(a)(4)(iii) of the Treasury regulations, the Distribution Date immediately following the maturity date for the Mortgage Loans with the latest maturity date has been designated as the “latest possible maturity date” for each Class of Certificates.
⁽²⁾	Calculated in accordance with the definition of “Pass-Through Rate” herein.
⁽³⁾	The Class CE Interest will accrue interest at their variable Pass-Through Rate on the Notional Amount of the Class CE Certificates outstanding from time to time which shall equal the Uncertificated Balance of the REMIC I Regular Interests (other than REMIC I Regular Interest I-LTP). The Class CE Interest will not accrue interest on their Certificate Principal Balance.
⁽⁴⁾	The Class P Interest will not accrue interest.

REMIC III

As provided herein, the Trustee shall make an election to treat the segregated pool of assets consisting of the Class CE Interest as a REMIC for federal income tax purposes, and such segregated pool of assets will be designated as “REMIC III.” The Class R-III Interest represents the sole class of “residual interests” in REMIC III for purposes of the REMIC Provisions.

The following table sets forth (or describes) the Class designation, Pass-Through Rate and initial aggregate Certificate Principal Balance for the indicated Class of Certificates that represents a “regular interest” in REMIC III created hereunder:

Class Designation	Pass-Through Rate	Initial Aggregate Certificate Principal Balance	Latest Possible Maturity Date⁽¹⁾
Class CE Certificates	Variable⁽²⁾	$11,215,935.04	March 25, 2035

_______________

⁽¹⁾	For purposes of Section 1.860G-1(a)(4)(iii) of the Treasury regulations, the Distribution Date immediately following the maturity date for the Mortgage Loans with the latest maturity date has been designated as the “latest possible maturity date” for the Class CE Certificates.
⁽²⁾	The Class CE Certificates will receive 100% of amounts received in respect of the Class CE Interest.

REMIC IV

As provided herein, the Trustee shall make an election to treat the segregated pool of assets consisting of the Class P Interest as a REMIC for federal income tax purposes, and such segregated pool of assets will be designated as “REMIC IV.” The Class R-IV Interest represents the sole class of “residual interests” in REMIC IV for purposes of the REMIC Provisions.

Class Designation	Pass-Through Rate	Initial Aggregate Certificate Principal Balance	Latest Possible Maturity Date⁽¹⁾
Class P Certificates	Variable⁽²⁾	$100.00	March 25, 2035

_______________

⁽¹⁾	For purposes of Section 1.860G-1(a)(4)(iii) of the Treasury regulations, the Distribution Date immediately following the maturity date for the Mortgage Loans with the latest maturity date has been designated as the “latest possible maturity date” for the Class P Certificates.
⁽²⁾	The Class P Certificates will receive 100% of amounts received in respect of the Class P Interest.

As of the Cut-off Date, the Original Mortgage Loans had an aggregate Principal Balance equal to $1,602,390,035.04. As of the Cut-off Date, the Group I Mortgage Loans had an Aggregate Principal Balance equal to $878,886,199.51 and the Group II Mortgage Loans had an Aggregate Principal Balance equal to $723,503,835.53.

In consideration of the mutual agreements herein contained, the Depositor, the Master Servicer and the Trustee agree as follows:

ARTICLE I

DEFINITIONS

Section 1.01.

Defined Terms.

Whenever used in this Agreement, including, without limitation, in the Preliminary Statement hereto, the following words and phrases, unless the context otherwise requires, shall have the meanings specified in this Article. Unless otherwise specified, all calculations described herein shall be made on the basis of a 360-day year consisting of twelve 30-day months.

“Accepted Servicing Practices”: The servicing standards set forth in Section 3.01.

“Accrual Period”: With respect to the Class A Certificates and the Mezzanine Certificates and each Distribution Date, the period commencing on the preceding Distribution Date (or in the case of the first such Accrual Period, commencing on the Closing Date) and ending on the day preceding the current Distribution Date. With respect to the Class CE Certificates and the REMIC I Regular Interests and each Distribution Date, the calendar month prior to the month of such Distribution Date.

“Adjustable-Rate Mortgage Loan”: Each of the Mortgage Loans identified in the Mortgage Loan Schedule as having a Mortgage Rate that is subject to adjustment.

“Adjusted Net Maximum Mortgage Rate”: With respect to any Mortgage Loan (or the related REO Property), as of any date of determination, a per annum rate of interest equal to the applicable Maximum Mortgage Rate for such Mortgage Loan (or the Mortgage Rate in the case of any Fixed-Rate Mortgage Loan) as of the first day of the month preceding the month in which the related Distribution Date occurs minus the sum of (i) the Trustee Fee Rate, (ii) the Servicing Fee Rate and (iii) the related PMI Insurer Fee Rate, if applicable.

“Adjusted Net Mortgage Rate”: With respect to any Mortgage Loan (or the related REO Property), as of any date of determination, a per annum rate of interest equal to the applicable Mortgage Rate for such Mortgage Loan as of the first day of the month preceding the month in which the related Distribution Date occurs minus the sum of (i) the Trustee Fee Rate, (ii) the Servicing Fee Rate and (iii) the related PMI Insurer Fee Rate, if applicable.

“Adjustment Date”: With respect to each Adjustable-Rate Mortgage Loan, the first day of the month in which the Mortgage Rate of such Mortgage Loan changes pursuant to the related Mortgage Note. The first Adjustment Date following the Cut-off Date as to each Adjustable-Rate Mortgage Loan is set forth in the Mortgage Loan Schedule.

“Advance”: As to any Mortgage Loan or REO Property, any advance made by the Master Servicer in respect of any Distribution Date pursuant to Section 4.03.

“Advance Facility”: As defined in Section 3.29 hereof.

“Advancing Person”: As defined in Section 3.29 hereof.

“Affiliate”: With respect to any specified Person, any other Person controlling or controlled by or under common control with such specified Person. For the purposes of this definition, “control” when used with respect to any specified Person means the power to direct the management and policies of such Person, directly or indirectly, whether through the ownership of voting securities, by contract or otherwise, and the terms “controlling” and “controlled” have meanings correlative to the foregoing.

“Aggregate Loss Severity Percentage”: With respect to any Distribution Date, the percentage equivalent of a fraction, the numerator of which is the aggregate amount of Realized Losses incurred on any Mortgage Loans from the Cut-off Date to the last day of the preceding calendar month and the denominator of which is the aggregate principal balance of such Mortgage Loans immediately prior to the liquidation of such Mortgage Loans.

“Agreement”: This Pooling and Servicing Agreement and all amendments hereof and supplements hereto.

“Allocated Realized Loss Amount”: With respect to any Distribution Date and any Class of Mezzanine Certificates, the sum of (i) any Realized Losses allocated to such Class of Certificates on such Distribution Date and (ii) the amount of any Allocated Realized Loss Amount for such Class of Certificates remaining unpaid from the previous Distribution Date and reduced by the amount of any Subsequent Recoveries added to the Certificate Principal Balance of such Class of Certificates.

“Assignment”: An assignment of Mortgage, notice of transfer or equivalent instrument, in recordable form (excepting therefrom, if applicable, the mortgage recordation information which has not been required pursuant to Section 2.01 hereof or returned by the applicable recorder’s office), which is sufficient under the laws of the jurisdiction wherein the related Mortgaged Property is located to reflect of record the sale of the Mortgage, which assignment, notice of transfer or equivalent instrument may be in the form of one or more blanket assignments covering Mortgages secured by Mortgaged Properties located in the same county, if permitted by law.

“Available Funds”: With respect to any Distribution Date, an amount equal to the excess of (i) the sum of (a) the aggregate of the related Monthly Payments received on the Mortgage Loans on or prior to the related Determination Date, (b) Net Liquidation Proceeds, Insurance Proceeds, Principal Prepayments, proceeds from repurchases of and substitutions for such Mortgage Loans and other unscheduled recoveries of principal and interest in respect of the Mortgage Loans received during the related Prepayment Period, (c) the aggregate of any amounts received in respect of a related REO Property withdrawn from any REO Account and deposited in the Collection Account for such Distribution Date, (d) the aggregate of any amounts deposited in the Collection Account by the Master Servicer in respect of related Prepayment Interest Shortfalls for such Distribution Date, (e) the aggregate of any Advances made by the Master Servicer for such Distribution Date in respect of the Mortgage Loans and (f) the aggregate of any related advances made by the Trustee in respect of the Mortgage Loans for such Distribution Date pursuant to Section 7.02 over (ii) the sum of (a) amounts reimbursable or payable to the Master Servicer pursuant to Section 3.11(a), (b) Extraordinary Trust Fund Expenses reimbursable to the Trustee pursuant to Section 3.11(b), (c) amounts deposited in the

Collection Account or the Distribution Account pursuant to clauses (a) through (f) above, as the case may be, in error, (d) the amount of any Prepayment Charges collected by the Master Servicer in connection with the full or partial prepayment of any of the Mortgage Loans and any Master Servicer Prepayment Charge Payment Amount, (e) the Trustee Fee and any indemnification amounts owed to the Trustee payable from the Distribution Account pursuant to Section 8.05 and (f) the PMI Insurer Fee payable to each PMI Insurer from the Distribution Account.

“Balloon Mortgage Loan”: A Mortgage Loan that provides for the payment of the unamortized principal balance of such Mortgage Loan in a single payment at the maturity of such Mortgage Loan that is substantially greater than the preceding monthly payment.

“Balloon Payment”: A payment of the unamortized principal balance of a Mortgage Loan in a single payment at the maturity of such Mortgage Loan that is substantially greater than the preceding Monthly Payment.

“Bankruptcy Code”: The Bankruptcy Reform Act of 1978 (Title 11 of the United States Code), as amended.

“Book-Entry Certificate”: The Class A Certificates and the Mezzanine Certificates for so long as the Certificates of such Class shall be registered in the name of the Depository or its nominee.

“Book-Entry Custodian”: The custodian appointed pursuant to Section 5.01.

“Business Day”: Any day other than a Saturday, a Sunday or a day on which banking or savings and loan institutions in the State of California, the State of New York, the Commonwealth of Pennsylvania, or in the cities in which the Corporate Trust Office of the Trustee is located, are authorized or obligated by law or executive order to be closed.

“Cap Contracts”: The Group I Cap Contract, the Group II Cap Contract and the Mezzanine Cap Contract between the Trustee on behalf of the Trust Fund and the counterparty thereunder, for the benefit of the Holders of the Offered Certificates, in the form annexed hereto as Exhibit L.

“Certificate”: Any one of the Mortgage Pass-Through Certificates, Series 2005-OPT1, Class A-1, Class A-2, Class A-3, Class A-4, Class A-5, Class M-1, Class M-2, Class M-3, Class M-4, Class M-5, Class M-6, Class M-7, Class M-8, Class M-9, Class M-10, Class M-11, Class CE, Class P, Class R or Class R-X, issued under this Agreement.

“Certificate Factor”: With respect to any Class of Regular Certificates as of any Distribution Date, a fraction, expressed as a decimal carried to six places, the numerator of which is the aggregate Certificate Principal Balance (or the Notional Amount, in the case of the Class CE Certificates) of such Class of Certificates on such Distribution Date (after giving effect to any distributions of principal and allocations of Realized Losses in reduction of the Certificate Principal Balance (or the Notional Amount, in the case of the Class CE Certificates) of such Class of Certificates to be made on such Distribution Date), and the denominator of which is the

initial aggregate Certificate Principal Balance (or the Notional Amount, in the case of the Class CE Certificates) of such Class of Certificates as of the Closing Date.

“Certificate Margin”: With respect to the Class A-1 Certificates and REMIC I Regular Interest I-LTA1, 0.305% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.610% in the case of each Distribution Date thereafter.

With respect to the Class A-2 Certificates and REMIC I Regular Interest I-LTA2, 0.260% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.520% in the case of each Distribution Date thereafter.

With respect to the Class A-3 Certificates and REMIC I Regular Interest I-LTA3, 0.090% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.180% in the case of each Distribution Date thereafter.

With respect to the Class A-4 Certificates and REMIC I Regular Interest I-LTA4, 0.180% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.360% in the case of each Distribution Date thereafter.

With respect to the Class A-5 Certificates and REMIC I Regular Interest I-LTA5, 0.310% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.620% in the case of each Distribution Date thereafter.

With respect to the Class M-1 Certificates and REMIC I Regular Interest I-LTM1, 0.400% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.600% in the case of each Distribution Date thereafter.

With respect to the Class M-2 Certificates and REMIC I Regular Interest I-LTM2, 0.420% in the case of each Distribution Date through and including the Distribution Date on

which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.630% in the case of each Distribution Date thereafter.

With respect to the Class M-3 Certificates and REMIC I Regular Interest I-LTM3, 0.460% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.690% in the case of each Distribution Date thereafter.

With respect to the Class M-4 Certificates and REMIC I Regular Interest I-LTM4, 0.500% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.750% in the case of each Distribution Date thereafter.

With respect to the Class M-5 Certificates and REMIC I Regular Interest I-LTM5, 0.600% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 0.900% in the case of each Distribution Date thereafter.

With respect to the Class M-6 Certificates and REMIC I Regular Interest I-LTM6, 0.680% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 1.020% in the case of each Distribution Date thereafter.

With respect to the Class M-7 Certificates and REMIC I Regular Interest I-LTM7, 0.920% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 1.380% in the case of each Distribution Date thereafter.

With respect to the Class M-8 Certificates and REMIC I Regular Interest I-LTM8, 1.000% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 1.500% in the case of each Distribution Date thereafter.

With respect to the Class M-9 Certificates and REMIC I Regular Interest I-LTM9, 1.750% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 2.625% in the case of each Distribution Date thereafter.

With respect to the Class M-10 Certificates and REMIC I Regular Interest I-LTM10, 2.500% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 3.750% in the case of each Distribution Date thereafter.

With respect to the Class M-11 Certificates and REMIC I Regular Interest I-LTM11, 3.500% in the case of each Distribution Date through and including the Distribution Date on which the aggregate Principal Balance of the Mortgage Loans (and properties acquired in respect thereof) remaining in the Trust Fund is reduced to less than 10% of the aggregate Cut-off Date Principal Balance of the Mortgage Loans and 5.250% in the case of each Distribution Date thereafter.

“Certificateholder” or “Holder”: The Person in whose name a Certificate is registered in the Certificate Register, except that a Disqualified Organization or a Non-United States Person shall not be a Holder of a Residual Certificate for any purposes hereof and, solely for the purposes of giving any consent pursuant to this Agreement, any Certificate registered in the name of the Depositor or the Master Servicer or any Affiliate thereof shall be deemed not to be outstanding and the Voting Rights to which it is entitled shall not be taken into account in determining whether the requisite percentage of Voting Rights necessary to effect any such consent has been obtained, except as otherwise provided in Section 11.01. The Trustee and the NIMS Insurer may conclusively rely upon a certificate of the Depositor or the Master Servicer in determining whether a Certificate is held by an Affiliate thereof. All references herein to “Holders” or “Certificateholders” shall reflect the rights of Certificate Owners as they may indirectly exercise such rights through the Depository and participating members thereof, except as otherwise specified herein; provided, however, that the Trustee and the NIMS Insurer shall be required to recognize as a “Holder” or “Certificateholder” only the Person in whose name a Certificate is registered in the Certificate Register.

“Certificate Owner”: With respect to a Book-Entry Certificate, the Person who is the beneficial owner of such Certificate as reflected on the books of the Depository or on the books of a Depository Participant or on the books of an indirect participating brokerage firm for which a Depository Participant acts as agent.

“Certificate Principal Balance”: With respect to each Class A Certificate, Mezzanine Certificate or Class P Certificate as of any date of determination plus any Subsequent Recoveries added to the Certificate Principal Balance of such Certificate pursuant to Section 4.01, the Certificate Principal Balance of such Certificate on the Distribution Date immediately prior to such date of determination, minus all distributions allocable to principal made thereon

and Realized Losses allocated thereto on such immediately prior Distribution Date (or, in the case of any date of determination up to and including the first Distribution Date, the initial Certificate Principal Balance of such Certificate, as stated on the face thereof). With respect to each Class CE Certificate as of any date of determination, an amount equal to the Percentage Interest evidenced by such Certificate times the excess, if any, of (A) the then aggregate Uncertificated Balances of the REMIC I Regular Interests over (B) the then aggregate Certificate Principal Balances of the Class A Certificates, the Mezzanine Certificates and the Class P Certificates then outstanding.

“Certificate Register”: The register maintained pursuant to Section 5.02.

“Class”: Collectively, all of the Certificates bearing the same class designation.

“Class A Certificates”: Any Class A-1 Certificate, Class A-2 Certificate, Class A-3 Certificate, Class A-4 Certificate or Class A-5 Certificate.

“Class A Principal Distribution Amount”: With respect to any Distribution Date, the sum of (i) the Senior Group I Principal Distribution Amount and (ii) the Senior Group II Principal Distribution Amount.

“Class A-1 Certificate”: Any one of the Class A-1 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-1 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class A-2 Certificate”: Any one of the Class A-2 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-2 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

Class A-3 Certificate”: Any one of the Class A-3 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-3 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

Class A-4 Certificate”: Any one of the Class A-4 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-4 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

Class A-5 Certificate”: Any one of the Class A-5 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-5 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class CE Certificate”: Any one of the Class CE Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-17 and evidencing a Regular Interest in REMIC III for purposes of the REMIC Provisions.

“Class CE Interest”: An uncertificated interest in the Trust Fund held by the Trustee on behalf of the Holders of the Class CE Certificates, evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-1 Certificate”: Any one of the Class M-1 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-6 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-1 Principal Distribution Amount”: The excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date) and (ii) the Certificate Principal Balance of the Class M-1 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 74.40% and (ii) the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-2 Certificate”: Any one of the Class M-2 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-7 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-2 Principal Distribution Amount”: The excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date) and (iii) the Certificate Principal Balance of the Class M-2 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 79.10% and (ii) the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-3 Certificate”: Any one of the Class M-3 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-8 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-3 Principal Distribution Amount”: With respect to any Distribution Date, the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2

Certificates (after taking into account the distribution of the Class M-2 Principal Distribution Amount on such Distribution Date) and (iv) the Certificate Principal Balance of the Class M-3 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 82.20% and (ii) the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-4 Certificate”: Any one of the Class M-4 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-9 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-4 Principal Distribution Amount”: With respect to any Distribution Date, the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2 Certificates (after taking into account the distribution of the Class M-2 Principal Distribution Amount on such Distribution Date), (iv) the Certificate Principal Balance of the Class M-3 Certificates (after taking into account the distribution of the Class M-3 Principal Distribution Amount on such Distribution Date) and (v) the Certificate Principal Balance of the Class M-4 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 87.10% and (ii) the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-5 Certificate”: Any one of the Class M-5 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-10 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-5 Principal Distribution Amount”: With respect to any Distribution Date, the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2 Certificates (after taking into account the distribution of the Class M-2 Principal Distribution

Amount on such Distribution Date), (iv) the Certificate Principal Balance of the Class M-3 Certificates (after taking into account the distribution of the Class M-3 Principal Distribution Amount on such Distribution Date), (v) the Certificate Principal Balance of the Class M-4 Certificates (after taking into account the distribution of the Class M-4 Principal Distribution Amount on such Distribution Date) and (vi) the Certificate Principal Balance of the Class M-5 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 88.80% and (ii) the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-6 Certificate”: Any one of the Class M-6 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-11 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-6 Principal Distribution Amount” is an amount equal to the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2 Certificates (after taking into account the distribution of the Class M-2 Principal Distribution Amount on such Distribution Date), (iv) the Certificate Principal Balance of the Class M-3 Certificates (after taking into account the distribution of the Class M-3 Principal Distribution Amount on such Distribution Date), (v) the Certificate Principal Balance of the Class M-4 Certificates (after taking into account the distribution of the Class M-4 Principal Distribution Amount on such Distribution Date), (vi) the Certificate Principal Balance of the Class M-5 Certificates (after taking into account the distribution of the Class M-5 Principal Distribution Amount on such Distribution Date) and (vii) the Certificate Principal Balance of the Class M-6 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 90.70% and (ii) the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-7 Certificate”: Any one of the Class M-7 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-12 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-7 Principal Distribution Amount” is an amount equal to the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2 Certificates (after taking into account the distribution of the Class M-2 Principal Distribution Amount on such Distribution Date), (iv) the Certificate Principal Balance of the Class M-3 Certificates (after taking into account the distribution of the Class M-3 Principal Distribution Amount on such Distribution Date), (v) the Certificate Principal Balance of the Class M-4 Certificates (after taking into account the distribution of the Class M-4 Principal Distribution Amount on such Distribution Date), (vi) the Certificate Principal Balance of the Class M-5 Certificates (after taking into account the distribution of the Class M-5 Principal Distribution Amount on such Distribution Date), (vii) the Certificate Principal Balance of the Class M-6 Certificates (after taking into account the distribution of the Class M-6 Principal Distribution Amount on such Distribution Date) and (viii) the Certificate Principal Balance of the Class M-7 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 93.00% and (ii) the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-8 Certificate”: Any one of the Class M-8 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-13 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-8 Principal Distribution Amount” is an amount equal to the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2 Certificates (after taking into account the distribution of the Class M-2 Principal Distribution Amount on such Distribution Date), (iv) the Certificate Principal Balance of the Class M-3 Certificates (after taking into account the distribution of the Class M-3 Principal Distribution Amount on such Distribution Date), (v) the Certificate Principal Balance of the Class M-4 Certificates (after taking into account the distribution of the Class M-4 Principal Distribution Amount on such Distribution Date), (vi) the Certificate Principal Balance of the Class M-5 Certificates (after taking into account the distribution of the Class M-5 Principal Distribution Amount on such Distribution Date), (vii) the Certificate Principal Balance of the Class M-6 Certificates (after taking into account the distribution of the Class M-6 Principal Distribution Amount on such Distribution Date), (viii) the Certificate Principal Balance of the Class M-7 Certificates (after

taking into account the distribution of the Class M-7 Principal Distribution Amount on such Distribution Date) and (ix) the Certificate Principal Balance of the Class M-8 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 94.80% and (ii) the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-9 Certificate”: Any one of the Class M-9 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-14 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-9 Principal Distribution Amount” is an amount equal to the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2 Certificates (after taking into account the distribution of the Class M-2 Principal Distribution Amount on such Distribution Date), (iv) the Certificate Principal Balance of the Class M-3 Certificates (after taking into account the distribution of the Class M-3 Principal Distribution Amount on such Distribution Date), (v) the Certificate Principal Balance of the Class M-4 Certificates (after taking into account the distribution of the Class M-4 Principal Distribution Amount on such Distribution Date), (vi) the Certificate Principal Balance of the Class M-5 Certificates (after taking into account the distribution of the Class M-5 Principal Distribution Amount on such Distribution Date), (vii) the Certificate Principal Balance of the Class M-6 Certificates (after taking into account the distribution of the Class M-6 Principal Distribution Amount on such Distribution Date), (viii) the Certificate Principal Balance of the Class M-7 Certificates (after taking into account the distribution of the Class M-7 Principal Distribution Amount on such Distribution Date), (ix) the Certificate Principal Balance of the Class M-8 Certificates (after taking into account the distribution of the Class M-8 Principal Distribution Amount on such Distribution Date) and (x) the Certificate Principal Balance of the Class M-9 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 96.70% and (ii) the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-10 Certificate”: Any one of the Class M-10 Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-15 and evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class M-10 Principal Distribution Amount” is an amount equal to the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2 Certificates (after taking into account the distribution of the Class M-2 Principal Distribution Amount on such Distribution Date), (iv) the Certificate Principal Balance of the Class M-3 Certificates (after taking into account the distribution of the Class M-3 Principal Distribution Amount on such Distribution Date), (v) the Certificate Principal Balance of the Class M-4 Certificates (after taking into account the distribution of the Class M-4 Principal Distribution Amount on such Distribution Date), (vi) the Certificate Principal Balance of the Class M-5 Certificates (after taking into account the distribution of the Class M-5 Principal Distribution Amount on such Distribution Date), (vii) the Certificate Principal Balance of the Class M-6 Certificates (after taking into account the distribution of the Class M-6 Principal Distribution Amount on such Distribution Date), (viii) the Certificate Principal Balance of the Class M-7 Certificates (after taking into account the distribution of the Class M-7 Principal Distribution Amount on such Distribution Date), (ix) the Certificate Principal Balance of the Class M-8 Certificates (after taking into account the distribution of the Class M-8 Principal Distribution Amount on such Distribution Date), (x) the Certificate Principal Balance of the Class M-9 Certificates (after taking into account the distribution of the Class M-9 Principal Distribution Amount on such Distribution Date) and (xi) the Certificate Principal Balance of the Class M-10 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 97.70% and (ii) the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class M-11 Principal Distribution Amount” is an amount equal to the excess of (x) the sum of (i) the aggregate Certificate Principal Balance of the Class A Certificates (after taking into account the distribution of the Class A Principal Distribution Amount on such Distribution Date), (ii) the Certificate Principal Balance of the Class M-1 Certificates (after taking into account the distribution of the Class M-1 Principal Distribution Amount on such Distribution Date), (iii) the Certificate Principal Balance of the Class M-2 Certificates (after taking into account the distribution of the Class M-2 Principal Distribution Amount on such Distribution Date), (iv) the Certificate Principal Balance of the Class M-3 Certificates (after taking into account the distribution of the Class M-3 Principal Distribution Amount on such Distribution Date), (v) the Certificate Principal Balance of the Class M-4 Certificates (after

taking into account the distribution of the Class M-4 Principal Distribution Amount on such Distribution Date), (vi) the Certificate Principal Balance of the Class M-5 Certificates (after taking into account the distribution of the Class M-5 Principal Distribution Amount on such Distribution Date), (vii) the Certificate Principal Balance of the Class M-6 Certificates (after taking into account the distribution of the Class M-6 Principal Distribution Amount on such Distribution Date), (viii) the Certificate Principal Balance of the Class M-7 Certificates (after taking into account the distribution of the Class M-7 Principal Distribution Amount on such Distribution Date), (ix) the Certificate Principal Balance of the Class M-8 Certificates (after taking into account the distribution of the Class M-8 Principal Distribution Amount on such Distribution Date), (x) the Certificate Principal Balance of the Class M-9 Certificates (after taking into account the distribution of the Class M-9 Principal Distribution Amount on such Distribution Date), (xi) the Certificate Principal Balance of the Class M-10 Certificates (after taking into account the distribution of the Class M-10 Principal Distribution Amount on such Distribution Date) and (xii) the Certificate Principal Balance of the Class M-11 Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 98.60% and (ii) the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $8,011,950.18.

“Class P Certificate”: Any one of the Class P Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-18 and evidencing a Regular Interest in REMIC IV for purposes of the REMIC Provisions.

“Class P Interest”: An uncertificated interest in the Trust Fund held by the Trustee on behalf of the Holders of the Class P Certificates, evidencing a Regular Interest in REMIC II for purposes of the REMIC Provisions.

“Class R Certificate”: Any one of the Class R Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-19 and evidencing the ownership of the Class R-I Interest and the Class R-II Interest.

“Class R-X Certificate”: Any one of the Class R-X Certificates executed, authenticated and delivered by the Trustee, substantially in the form annexed hereto as Exhibit A-20 and evidencing the ownership of the Class R-III Interest and the Class R-IV Interest.

“Class R-I Interest”: The uncertificated Residual Interest in REMIC I.

“Class R-II Interest”: The uncertificated Residual Interest in REMIC II.

“Class R-III Interest”: The uncertificated Residual Interest in REMIC III.

“Class R-IV Interest”: The uncertificated Residual Interest in REMIC IV.

“Closing Date”: May 12, 2005.

“Code”: The Internal Revenue Code of 1986, as amended.

“Collection Account”: The segregated account or accounts created and maintained, or caused to be created and maintained, by the Master Servicer pursuant to Section 3.10(a), which shall be entitled “Option One Mortgage Corporation, as Master Servicer for Wells Fargo Bank, N.A., as Trustee, in trust for the registered holders of MASTR Asset Backed Securities Trust 2005-OPT1, Mortgage Pass-Through Certificates.” The Collection Account must be an Eligible Account.

“Commission”: The Securities and Exchange Commission.

“Compensating Interest”: As defined in Section 3.24 hereof.

“Corporate Trust Office”: The principal corporate trust office of the Trustee at which at any particular time its corporate trust business in connection with this Agreement shall be administered, which office, at the date of the execution of this instrument is located (i) for Certificate transfer purposes, at Sixth Street and Marquette Avenue, Minneapolis, Minnesota 55479-0113, Attention: Corporate Trust Services – MASTR Series 2005-OPT1 and (ii) for all other purposes, at 9062 Old Annapolis Road, Columbia, Maryland 21045, Attention: MASTR Series 2005-OPT1, or at such other address as the Trustee may designate from time to time by notice to the Certificateholders, the Depositor and the Master Servicer.

“Corresponding Certificate”: With respect to (i) REMIC I Regular Interest I-LTA1, (ii) REMIC I Regular Interest I-LTA2, (iii) REMIC I Regular Interest I-LTA3, (iv) REMIC I Regular Interest I-LTA4, (v) REMIC I Regular Interest I-LTA5, (vi) REMIC I Regular Interest I-LTM1, (vii) REMIC I Regular Interest I-LTM2, (viii) REMIC I Regular Interest I-LTM3, (ix) REMIC I Regular Interest I-LTM4, (x) REMIC I Regular Interest I-LTM5, (xi) REMIC I Regular Interest I-LTM6, (xii) REMIC I Regular Interest I-LTM7, (xiii) REMIC I Regular Interest I-LTM8, (xiv) REMIC I Regular Interest I-LTM9, (xv) REMIC I Regular Interest I-LTM10, (xvi) REMIC I Regular Interest I-LTM11 and (xvii) REMIC I Regular Interest I-LTP, (i) the Class A-1 Certificates, (ii) the Class A-2 Certificates, (iii) the Class A-3 Certificates, (iv) the Class A-4 Certificates, (v) the Class A-5 Certificates, (vi) the Class M-1 Certificates, (vii) the Class M-2 Certificates, (viii) the Class M-3 Certificates, (ix) the Class M-4 Certificates, (x) the Class M-5 Certificates, (xi) the Class M-6 Certificates, (xii) the Class M-7 Certificates, (xiii) the Class M-8 Certificates, (xiv) the Class M-9 Certificates, (xv) the Class M-10 Certificates, (xvi) the Class M-11 Certificates and (xvii) the Class P Certificates, respectively.

“Credit Enhancement Percentage”: For any Distribution Date, the percentage equivalent of a fraction, the numerator of which is the sum of the aggregate Certificate Principal Balances of the Mezzanine Certificates and the Class CE Certificates, and the denominator of which is the aggregate Stated Principal Balance of the Mortgage Loans, calculated prior to taking into account distributions of principal on the Mortgage Loans and distribution of the Group I Principal Distribution Amount and the Group II Principal Distribution Amount to the Certificates then entitled to distributions of principal on such Distribution Date.

“Cumulative Loss Percentage”: With respect to any Distribution Date, the percentage equivalent of a fraction, the numerator of which is the aggregate amount of Realized Losses incurred from the Cut-off Date to the last day of the preceding calendar month and the denominator of which is the sum of the aggregate Stated Principal Balance of the Mortgage Loans as of the Cut-off Date.

“Cut-off Date”: With respect to each Original Mortgage Loan, May 1, 2005. With respect to all Qualified Substitute Mortgage Loans, their respective dates of substitution. References herein to the “Cut-off Date,” when used with respect to more than one Mortgage Loan, shall be to the respective Cut-off Dates for such Mortgage Loans.

“Cut-off Date Principal Balance”: With respect to any Mortgage Loan, the unpaid principal balance thereof as of the Cut-off Date of such Mortgage Loan (or as of the applicable date of substitution with respect to a Qualified Substitute Mortgage Loan), after giving effect to scheduled payments due on or before the Cut-off Date, whether or not received.

“Debt Service Reduction”: With respect to any Mortgage Loan, a reduction in the scheduled Monthly Payment for such Mortgage Loan by a court of competent jurisdiction in a proceeding under the Bankruptcy Code, except such a reduction resulting from a Deficient Valuation.

“Deficient Valuation”: With respect to any Mortgage Loan, a valuation of the related Mortgaged Property by a court of competent jurisdiction in an amount less than the then outstanding principal balance of the Mortgage Loan, which valuation results from a proceeding initiated under the Bankruptcy Code.

“Definitive Certificates”: As defined in Section 5.01(b).

“Deleted Mortgage Loan”: A Mortgage Loan replaced or to be replaced by a Qualified Substitute Mortgage Loan.

“Delinquency Master Servicer Termination Trigger”: A Delinquency Master Servicer Termination Trigger will have occurred with respect to the Certificates on a Distribution Date if the Three Month Rolling Delinquency Percentage for the Mortgage Loans exceeds 16.00%.

“Delinquency Percentage”: As of the last day of the related Due Period, the percentage equivalent of a fraction, the numerator of which is the aggregate Stated Principal Balance of all Mortgage Loans that, as of the last day of the previous calendar month, are 60 or more days delinquent, are in foreclosure, have been converted to REO Properties or have been discharged by reason of bankruptcy, and the denominator of which is the aggregate Stated Principal Balance of the Mortgage Loans and REO Properties as of the last day of the previous calendar month.

“Depositor”: Mortgage Asset Securitization Transactions, Inc., a Delaware corporation, or its successor in interest.

“Depository”: The Depository Trust Company, or any successor Depository hereafter named. The nominee of the initial Depository, for purposes of registering those Certificates that are to be Book-Entry Certificates, is CEDE & Co. The Depository shall at all times be a “clearing corporation” as defined in Section 8-102(3) of the Uniform Commercial Code of the State of New York and a “clearing agency” registered pursuant to the provisions of Section 17A of the Securities Exchange Act of 1934, as amended.

“Depository Participant”: A broker, dealer, bank or other financial institution or other Person for whom from time to time a Depository effects book-entry transfers and pledges of securities deposited with the Depository.

“Determination Date”: With respect to any Distribution Date, the 15^th day of the calendar month in which such Distribution Date occurs or, if such 15^th day is not a Business Day, the Business Day immediately preceding such 15^th day.

“Directly Operate”: With respect to any REO Property, the furnishing or rendering of services to the tenants thereof, the management or operation of such REO Property, the holding of such REO Property primarily for sale to customers, the performance of any construction work thereon or any use of such REO Property in a trade or business conducted by REMIC I other than through an Independent Contractor; provided, however, that the Trustee (or the Master Servicer on behalf of the Trustee) shall not be considered to Directly Operate an REO Property solely because the Trustee (or the Master Servicer on behalf of the Trustee) establishes rental terms, chooses tenants, enters into or renews leases, deals with taxes and insurance, or makes decisions as to repairs or capital expenditures with respect to such REO Property.

“Disqualified Organization”: Any of the following: (i) the United States, any State or political subdivision thereof, any possession of the United States, or any agency or instrumentality of any of the foregoing (other than an instrumentality which is a corporation if all of its activities are subject to tax and, except for Freddie Mac, a majority of its board of directors is not selected by such governmental unit), (ii) any foreign government, any international organization, or any agency or instrumentality of any of the foregoing, (iii) any organization (other than certain farmers’ cooperatives described in Section 521 of the Code) which is exempt from the tax imposed by Chapter 1 of the Code (including the tax imposed by Section 511 of the Code on unrelated business taxable income), (iv) rural electric and telephone cooperatives described in Section 1381(a)(2)(C) of the Code, (v) an “electing large partnership” and (vi) any other Person so designated by the Trustee based upon an Opinion of Counsel that the holding of an Ownership Interest in a Residual Certificate by such Person may cause any of REMIC I or REMIC II or any Person having an Ownership Interest in any Class of Certificates (other than such Person) to incur a liability for any federal tax imposed under the Code that would not otherwise be imposed but for the Transfer of an Ownership Interest in a Residual Certificate to such Person. The terms “United States,” “State” and “international organization” shall have the meanings set forth in Section 7701 of the Code or successor provisions.

“Distribution Account”: The segregated trust account or accounts created and maintained by the Trustee pursuant to Section 3.10(b), which shall be entitled “Wells Fargo Bank, N.A., as Trustee, in trust for the registered holders of MASTR Asset Backed Securities

Trust 2005-OPT1, Mortgage Pass-Through Certificates.” The Distribution Account must be an Eligible Account.

“Distribution Date”: The 25^th day of any month, or if such 25^th day is not a Business Day, the Business Day immediately following such 25^th day, commencing in June 2005.

“Due Date”: With respect to each Distribution Date, the first day of the calendar month in which such Distribution Date occurs, which is generally the day of the month on which the Monthly Payment is due on a Mortgage Loan, exclusive of any days of grace.

“Due Period”: With respect to any Distribution Date, the period commencing on the second day of the month immediately preceding the month in which such Distribution Date occurs and ending on the related Due Date.

“Eligible Account”: Any of (i) an account or accounts maintained with a federal or state chartered depository institution or trust company the short-term unsecured debt obligations of which (or, in the case of a depository institution or trust company that is the principal subsidiary of a holding company, the short-term unsecured debt obligations of such holding company) are rated P-1 by Moody’s, F-1 by Fitch or A-1+ by S&P (or comparable ratings if Moody’s, Fitch and S&P are not the Rating Agencies) at the time any amounts are held on deposit therein, (ii) an account or accounts the deposits in which are fully insured by the FDIC (to the limits established by such corporation), the uninsured deposits in which account are otherwise secured such that, as evidenced by an Opinion of Counsel delivered to the NIMS Insurer, the Trustee and to each Rating Agency, the Certificateholders will have a claim with respect to the funds in such account or a perfected first priority security interest against such collateral (which shall be limited to Permitted Investments) securing such funds that is superior to claims of any other depositors or creditors of the depository institution with which such account is maintained, (iii) a trust account or accounts maintained with the trust department of a federal or state chartered depository institution, national banking association or trust company acting in its fiduciary capacity or (iv) an account otherwise acceptable to the NIMS Insurer and to each Rating Agency without reduction or withdrawal of their then current ratings of the Certificates as evidenced by a letter from each Rating Agency to the Trustee and the NIMS Insurer. Eligible Accounts may bear interest.

“ERISA”: The Employee Retirement Income Security Act of 1974, as amended.

“Escrow Payments”: The amounts constituting ground rents, taxes, assessments, water rates, fire and hazard insurance premiums and other payments required to be escrowed by the Mortgagor with the mortgagee pursuant to any Mortgage Loan.

“Estate in Real Property”: A fee simple estate in a parcel of land.

“Excess Overcollateralized Amount”: With respect to the Class A Certificates and the Mezzanine Certificates and any Distribution Date, the excess, if any, of (i) the Overcollateralized Amount for such Distribution Date, assuming that 100% of the Principal

Remittance Amount is applied as a principal payment on such Distribution Date over (ii) the Overcollateralization Target Amount for such Distribution Date.

“Extra Principal Distribution Amount”: With respect to any Distribution Date, the lesser of (x) the Monthly Interest Distributable Amount payable on the Class CE Certificates on such Distribution Date as reduced by Realized Losses allocated thereto with respect to such Distribution Date pursuant to Section 4.04 and (y) the Overcollateralization Deficiency Amount for such Distribution Date.

“Extraordinary Trust Fund Expense”: Any amounts reimbursable to the Trustee, or any director, officer, employee or agent of the Trustee from the Trust Fund pursuant to Section 8.05 or Section 10.01(c) and any amounts payable from the Distribution Account in respect of taxes pursuant to Section 10.01(g)(iii).

“Fannie Mae”: Fannie Mae, formally known as the Federal National Mortgage Association, or any successor thereto.

“FDIC”: Federal Deposit Insurance Corporation or any successor thereto.

“Final Recovery Determination”: With respect to any defaulted Mortgage Loan or any REO Property (other than a Mortgage Loan or REO Property purchased by the Originator, the Seller, the Depositor or the Master Servicer pursuant to or as contemplated by Section 2.03, Section 3.16(c) or Section 9.01), a determination made by the Master Servicer that all Insurance Proceeds, Liquidation Proceeds and other payments or recoveries which the Master Servicer, in its reasonable good faith judgment, expects to be finally recoverable in respect thereof have been so recovered. The Master Servicer shall maintain records, prepared by a Servicing Officer, of each Final Recovery Determination made thereby.

“Fitch”: Fitch Ratings, or its successor in interest.

“Fixed-Rate Mortgage Loan”: Each of the Mortgage Loans identified in the Mortgage Loan Schedule as having a Mortgage Rate that is fixed.

“Formula Rate”: For any Distribution Date and the Offered Certificates, the lesser of (i) One-Month LIBOR plus the related Certificate Margin and (ii) the Maximum Cap Rate.

“Freddie Mac”: Freddie Mac, formally known as the Federal Home Loan Mortgage Corporation, or any successor thereto.

“Gross Margin”: With respect to each Adjustable-Rate Mortgage Loan, the fixed percentage set forth in the related Mortgage Note that is added to the Index on each Adjustment Date in accordance with the terms of the related Mortgage Note used to determine the Mortgage Rate for such Adjustable-Rate Mortgage Loan.

“Group I Allocation Percentage”: With respect to any Distribution Date, the percentage equivalent of a fraction, the numerator of which is (i) the Group I Principal

Remittance Amount for such Distribution Date, and the denominator of which is (ii) the Principal Remittance Amount for such Distribution Date.

“Group I Basic Principal Distribution Amount”: With respect to any Distribution Date, the excess of (i) the Group I Principal Remittance Amount for such Distribution Date over (ii)(a) the Overcollateralization Release Amount, if any, for such Distribution Date multiplied by (b) the Group I Allocation Percentage.

“Group I Cap Contract”: The Cap Contract between the Trustee on behalf of the Trust Fund and the counterparty thereunder, for the benefit of the Holders of the Group I Certificates.

“Group I Certificates”: The Class A-1 Certificates and the Class A-2 Certificates.

“Group I Interest Remittance Amount”: With respect to any Distribution Date, that portion of the Available Funds for such Distribution Date attributable to interest received or advanced with respect to the Group I Mortgage Loans.

“Group I Mortgage Loan”: A Mortgage Loan assigned to Loan Group I with a principal balance that conforms to Fannie Mae and Freddie Mac loan limits.

“Group I Principal Distribution Amount”: With respect to any Distribution Date, the sum of (i) the Group I Basic Principal Distribution Amount for such Distribution Date and (ii)(a) the Extra Principal Distribution Amount for such Distribution Date multiplied by (b) the Group I Allocation Percentage.

“Group I Principal Remittance Amount”: With respect to any Distribution Date, the sum of (i) each scheduled payment of principal collected or advanced on the Group I Mortgage Loans by the Master Servicer that were due during the related Due Period, (ii) the principal portion of all partial and full principal prepayments of the Group I Mortgage Loans applied by the Master Servicer during the related Prepayment Period, (iii) the principal portion of all related Net Liquidation Proceeds, Insurance Proceeds and Subsequent Recoveries received during such Prepayment Period with respect to the Group I Mortgage Loans, (iv) that portion of the Purchase Price, representing principal of any repurchased Group I Mortgage Loan, deposited to the Collection Account during such Prepayment Period, (v) the principal portion of any related Substitution Adjustment Amounts deposited in the Collection Account during such Prepayment Period with respect to the Group I Mortgage Loans and (vi) on the Distribution Date on which the Trust Fund is to be terminated pursuant to Section 9.01, that portion of the Termination Price, in respect of principal on the Group I Mortgage Loans.

“Group II Allocation Percentage”: With respect to any Distribution Date, the percentage equivalent of a fraction, the numerator of which is (i) the Group II Principal Remittance Amount for such Distribution Date, and the denominator of which is (ii) the Principal Remittance Amount for such Distribution Date.

“Group II Basic Principal Distribution Amount”: With respect to any Distribution Date, the excess of (i) the Group II Principal Remittance Amount for such Distribution Date over

(ii)(a) the Overcollateralization Release Amount, if any, for such Distribution Date multiplied by (b) the Group II Allocation Percentage.

“Group II Cap Contract”: The Cap Contract between the Trustee on behalf of the Trust Fund and the counterparty thereunder, for the benefit of the Holders of the Group II Certificates.

“Group II Certificates”: The Class A-3 Certificates, the Class A-4 Certificates and the Class A-5 Certificates.

“Group II Interest Remittance Amount”: With respect to any Distribution Date, that portion of the Available Funds for such Distribution Date attributable to interest received or advanced with respect to the Group II Mortgage Loans.

“Group II Mortgage Loan”: A Mortgage Loan assigned to Loan Group II with a principal balance that may or may not conform to Fannie Mae and Freddie Mac loan limits.

“Group II Principal Distribution Amount”: With respect to any Distribution Date, the sum of (i) the Group II Basic Principal Distribution Amount for such Distribution Date and (ii)(a) the Extra Principal Distribution Amount for such Distribution Date multiplied by (b) the Group II Allocation Percentage.

“Group II Principal Remittance Amount”: With respect to any Distribution Date, the sum of (i) each scheduled payment of principal collected or advanced on the Group II Mortgage Loans by the Master Servicer that were due during the related Due Period, (ii) the principal portion of all partial and full principal prepayments of the Group II Mortgage Loans applied by the Master Servicer during the related Prepayment Period, (iii) the principal portion of all related Net Liquidation Proceeds, Insurance Proceeds and Subsequent Recoveries received during such Prepayment Period with respect to the Group II Mortgage Loans, (iv) that portion of the Purchase Price, representing principal of any repurchased Group II Mortgage Loan, deposited to the Collection Account during such Prepayment Period, (v) the principal portion of any related Substitution Adjustment Amounts deposited in the Collection Account during such Prepayment Period with respect to the Group II Mortgage Loans and (vi) on the Distribution Date on which the Trust Fund is to be terminated pursuant to Section 9.01, that portion of the Termination Price, in respect of principal on the Group II Mortgage Loans.

“Highest Priority”: As of any date of determination, the Class of Mezzanine Certificates then outstanding with a Certificate Principal Balance greater than zero, with the highest priority for payments pursuant to Section 4.01, in the following order: Class M-1, Class M-2, Class M-3, Class M-4, Class M-5, Class M-6, Class M-7, Class M-8, Class M-9, Class M-10 and Class M-11 Certificates.

“Indenture”: An indenture relating to the issuance of notes secured by the Class CE Certificates, the Class P Certificates and/or the Class R Certificates (or any portion thereof) which may or may not be guaranteed by the NIMS Insurer.

“Independent”: When used with respect to any specified Person, any such Person who (a) is in fact independent of the Depositor, the Seller, the Master Servicer, the Originator and their respective Affiliates, (b) does not have any direct financial interest in or any material indirect financial interest in the Depositor, the Seller, the Originator, the Master Servicer or any Affiliate thereof, and (c) is not connected with the Depositor, the Seller, the Originator, the Master Servicer or any Affiliate thereof as an officer, employee, promoter, underwriter, trustee, partner, director or Person performing similar functions; provided, however, that a Person shall not fail to be Independent of the Depositor, the Seller, the Originator, the Master Servicer or any Affiliate thereof merely because such Person is the beneficial owner of 1% or less of any class of securities issued by the Depositor, the Seller, the Originator, the Master Servicer or any Affiliate thereof, as the case may be.

“Independent Contractor”: Either (i) any Person (other than the Master Servicer) that would be an “independent contractor” with respect to REMIC I within the meaning of Section 856(d)(3) of the Code if REMIC I were a real estate investment trust (except that the ownership tests set forth in that section shall be considered to be met by any Person that owns, directly or indirectly, 35% or more of any Class of Certificates), so long as REMIC I does not receive or derive any income from such Person and provided that the relationship between such Person and REMIC I is at arm’s length, all within the meaning of Treasury Regulation Section 1.856-4(b)(5), or (ii) any other Person (including the Master Servicer) if the Trustee has received an Opinion of Counsel to the effect that the taking of any action in respect of any REO Property by such Person, subject to any conditions therein specified, that is otherwise herein contemplated to be taken by an Independent Contractor will not cause such REO Property to cease to qualify as “foreclosure property” within the meaning of Section 860G(a)(8) of the Code (determined without regard to the exception applicable for purposes of Section 860D(a) of the Code), or cause any income realized in respect of such REO Property to fail to qualify as Rents from Real Property.

“Index”: With respect to each Adjustable Rate Mortgage Loan and with respect to each related Adjustment Date, the index as specified in the related Mortgage Note.

“Insurance Proceeds”: Proceeds of any title policy, hazard policy or other insurance policy, including each PMI Policy, covering a Mortgage Loan, to the extent such proceeds are not to be applied to the restoration of the related Mortgaged Property or released to the Mortgagor in accordance with the procedures that the Master Servicer would follow in servicing mortgage loans held for its own account, subject to the terms and conditions of the related Mortgage Note and Mortgage.

“Interest Determination Date”: With respect to the Class A Certificates, the Mezzanine Certificates, REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10 and REMIC I Regular Interest I-LTM11 and any Accrual Period therefor, the second LIBOR Business Day preceding the commencement of such Accrual Period.

“Late Collections”: With respect to any Mortgage Loan and any Due Period, all amounts received subsequent to the Determination Date immediately following such Due Period, whether as late payments of Monthly Payments or as Insurance Proceeds, Liquidation Proceeds or otherwise, which represent late payments or collections of principal and/or interest due (without regard to any acceleration of payments under the related Mortgage and Mortgage Note) but delinquent for such Due Period and not previously recovered.

“LIBOR Business Day”: Any day on which banks are open for dealing in foreign currency and exchange in London and New York City.

“Liquidated Mortgage Loan”: As to any Distribution Date, any Mortgage Loan in respect of which the Master Servicer has determined, in accordance with the servicing procedures specified herein, as of the end of the related Prepayment Period, that all Liquidation Proceeds which it expects to recover with respect to the liquidation of the Mortgage Loan or disposition of the related REO Property have been recovered.

“Liquidation Event”: With respect to any Mortgage Loan, any of the following events: (i) such Mortgage Loan is paid in full; (ii) a Final Recovery Determination is made as to such Mortgage Loan; or (iii) such Mortgage Loan is removed from REMIC I by reason of its being purchased, sold or replaced pursuant to or as contemplated by Section 2.03, Section 3.16(c) or Section 9.01. With respect to any REO Property, either of the following events: (i) a Final Recovery Determination is made as to such REO Property; or (ii) such REO Property is removed from REMIC I by reason of its being purchased pursuant to Section 9.01.

“Liquidation Proceeds”: The amount (other than amounts received in respect of the rental of any REO Property prior to REO Disposition) received by the Master Servicer in connection with (i) the taking of all or a part of a Mortgaged Property by exercise of the power of eminent domain or condemnation, (ii) the liquidation of a defaulted Mortgage Loan through a trustee’s sale, foreclosure sale or otherwise, or (iii) the repurchase, substitution or sale of a Mortgage Loan or an REO Property pursuant to or as contemplated by Section 2.03, Section 3.16(c), Section 3.23 or Section 9.01.

“Loan-to-Value Ratio”: As of any date of determination, the fraction, expressed as a percentage, the numerator of which is the principal balance of the related Mortgage Loan at such date and the denominator of which is the Value of the related Mortgaged Property.

“Loan Group”: Any of Loan Group I or Loan Group II, as the context requires.

“Loan Group I”: The group of Mortgage Loans identified in the Mortgage Loan Schedule as having been assigned to Loan Group I.

“Loan Group II”: The group of Mortgage Loans identified in the Mortgage Loan Schedule as having been assigned to Loan Group II.

“Loss Severity Percentage”: With respect to any Distribution Date, the percentage equivalent of a fraction, the numerator of which is the amount of Realized Losses incurred on a

Mortgage Loan and the denominator of which is the principal balance of such Mortgage Loan immediately prior to the liquidation of such Mortgage Loan.

“Marker Rate”: With respect to the Class CE Interest and any Distribution Date, a per annum rate equal to two (2) times the weighted average of the REMIC I Remittance Rate for each of REMIC I Regular Interests I-LTA1, I-LTA2, I-LTA3, I-LTA4, I-LTA5, I-LTM1, I-LTM2, I-LTM3, I-LTM4, I-LTM5, I-LTM6, I-LTM7, I-LTM8, I-LTM9, I-LTM10, I-LTM11 and I-LTZZ, with the rate on each such REMIC I Regular Interest (other than the REMIC I Regular Interest I-LTZZ) subject to a cap equal to the lesser of (a) One-Month LIBOR plus the related Certificate Margin for the corresponding Certificate and (b) the related Net WAC Cap rate for the purpose of this calculation for such Distribution Date and with the rate on REMIC I Regular Interest I-LTZZ subject to a cap of zero for the purpose of this calculation; provided, however, that solely for this purpose, calculations of the REMIC I Remittance Rate and the related caps with respect to such REMIC I Regular Interests (other than REMIC I Regular Interest I-LTZZ) shall be multiplied by a fraction, the numerator of which is the actual number of days in the Accrual Period and the denominator of which is 30.

“Master Servicer”: Option One Mortgage Corporation or any successor master servicer appointed as herein provided, in its capacity as Master Servicer hereunder.

“Master Servicer Event of Default”: One or more of the events described in Section 7.01.

“Master Servicer Prepayment Charge Payment Amount”: The amounts payable by the Master Servicer in respect of any Prepayment Charges pursuant to Section 2.05 or Section 3.01.

“Master Servicer Remittance Date”: With respect to any Distribution Date, by 1:00 p.m. New York time the Business Day immediately preceding the related Distribution Date.

“Maximum Cap Rate”: For any Distribution Date with respect to the Offered Certificates, a per annum rate equal to the weighted average of the Adjusted Net Maximum Mortgage Rates of the Mortgage Loans multiplied by a fraction, the numerator of which is 30 and the denominator of which is the actual number of days elapsed in the related Accrual Period.

“Maximum I-LTZZ Uncertificated Interest Deferral Amount”: With respect to any Distribution Date, the excess of (i) accrued interest at the REMIC I Remittance Rate applicable to REMIC I Regular Interest I-LTZZ for such Distribution Date on a balance equal to the Uncertificated Balance of REMIC I Regular Interest I-LTZZ minus the REMIC I Overcollateralization Amount, in each case for such Distribution Date, over (ii) Uncertificated Interest on REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10 and

REMIC I Regular Interest I-LTM11 for such Distribution Date, with the rate on REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10 and REMIC I Regular Interest I-LTM11 subject to a cap equal to the lesser of (i) One-Month LIBOR plus the related Certificate Margin for the corresponding Certificate and (ii) the related Net WAC Cap Rate; provided, however, each cap shall be multiplied by a fraction, the numerator of which is the actual number of days in the related Accrual Period and the denominator of which is 30.

“Maximum Mortgage Rate”: With respect to each Adjustable-Rate Mortgage Loan, the percentage set forth in the related Mortgage Note as the maximum Mortgage Rate thereunder.

“Mezzanine Cap Contract”: The Cap Contract between the Trustee on behalf of the Trust Fund and the counterparty thereunder, for the benefit of the Holders of the Mezzanine Certificates.

“Mezzanine Certificate”: Any Class M-1 Certificate, Class M-2 Certificate, Class M-3 Certificate, Class M-4 Certificate, Class M-5 Certificate, Class M-6 Certificate, Class M-7 Certificate, Class M-8 Certificate, Class M-9 Certificate or Class M-10 Certificate.

“Minimum Mortgage Rate”: With respect to each Adjustable-Rate Mortgage Loan, the percentage set forth in the related Mortgage Note as the minimum Mortgage Rate thereunder.

“Monthly Interest Distributable Amount”: With respect to the Class A Certificates, the Mezzanine Certificates and the Class CE Certificates and any Distribution Date, the amount of interest accrued during the related Accrual Period at the related Pass-Through Rate on the Certificate Principal Balance (or Notional Amount in the case of the Class CE Certificates) of such Class immediately prior to such Distribution Date, reduced by any Prepayment Interest Shortfalls (to the extent not covered by payments made by the Master Servicer pursuant to Section 3.24) and Relief Act Interest Shortfalls (allocated to such Certificate based on its respective entitlements to interest irrespective of any Prepayment Interest Shortfalls and Relief Act Interest Shortfalls for such Distribution Date). The Monthly Interest Distributable Amount will be calculated for the Class A Certificates and the Mezzanine Certificates on the basis of the actual number of days in the related Accrual Period, based on a 360-day year.

“Monthly Payment”: With respect to any Mortgage Loan, the scheduled monthly payment of principal and interest on such Mortgage Loan which is payable by the related Mortgagor from time to time under the related Mortgage Note, determined: (a) after giving effect to (i) any Deficient Valuation and/or Debt Service Reduction with respect to such Mortgage Loan and (ii) any reduction in the amount of interest collectible from the related Mortgagor pursuant to the Relief Act; (b) without giving effect to any extension granted or agreed to by the

Master Servicer pursuant to Section 3.07 and (c) on the assumption that all other amounts, if any, due under such Mortgage Loan are paid when due.

“Monthly Statement”: The statement prepared by the Trustee pursuant to Section 4.02.

“Moody’s”: Moody’s Investors Service, Inc. or its successor in interest.

“Mortgage”: The mortgage, deed of trust or other instrument creating a first or second lien on, or first or second priority security interest in, a Mortgaged Property securing a Mortgage Note.

“Mortgage File”: The mortgage documents listed in Section 2.01 pertaining to a particular Mortgage Loan and any additional documents required to be added to the Mortgage File pursuant to this Agreement.

“Mortgage Loan”: Each mortgage loan transferred and assigned to the Trustee and delivered to the Trustee pursuant to Section 2.01 or Section 2.03(b) of this Agreement, as held from time to time as a part of the Trust, the Mortgage Loans so held being identified in the Mortgage Loan Schedule.

“Mortgage Loan Purchase Agreement”: The agreement among the Seller, the Originator and the Depositor, regarding the sale of the Mortgage Loans by the Seller to the Depositor, substantially in the form of Exhibit D annexed hereto.

“Mortgage Loan Schedule”: As of any date, the list of Mortgage Loans included in REMIC I on such date, attached hereto as Schedule 1. The Mortgage Loan Schedule shall set forth the following information with respect to each Mortgage Loan:

(1)	the Mortgage Loan identifying number;
(2)	[reserved];
(3)	the state and zip code of the Mortgaged Property;

(4) a code indicating whether the Mortgaged Property was represented by the borrower, at the time of origination, as being owner-occupied;

(5)	the type of Residential Dwelling constituting the Mortgaged Property;
(6)	the original months to maturity;

(7) the stated remaining months to maturity from the Cut-off Date based on the original amortization schedule;

(8)	the Loan-to-Value Ratio at origination;
(9)	the Mortgage Rate in effect immediately following the Cut-off Date;

(10) the date on which the first Monthly Payment was due on the Mortgage Loan;

(11)	the stated maturity date;
(12)	the amount of the Monthly Payment at origination;

(13) the amount of the Monthly Payment due on the first Due Date after the Cut-off Date;

(14) the last Due Date on which a Monthly Payment was actually applied to the unpaid Stated Principal Balance;

(15)	the original principal amount of the Mortgage Loan;

(16) the Stated Principal Balance of the Mortgage Loan as of the close of business on the Cut-off Date;

(17) a code indicating the purpose of the Mortgage Loan (i.e., purchase financing, rate/term refinancing, cash-out refinancing);

(18)	the Mortgage Rate at origination;

(19) a code indicating the documentation program (i.e., full documentation, limited documentation, stated income documentation);

(20)	the risk grade;
(21)	the Value of the Mortgaged Property;
(22)	the sale price of the Mortgaged Property, if applicable;

(23) the actual unpaid principal balance of the Mortgage Loan as of the Cut-off Date;

(24)	the type and term of the related Prepayment Charge;
(25)	the rounding code;
(26)	the program code;
(27)	a code indicating the lien priority for Mortgage Loans;

(28) with respect to each Adjustable Rate Mortgage Loan, the Minimum Mortgage Rate;

(29) with respect to each Adjustable Rate Mortgage Loan, the Maximum Mortgage Rate;

(30)	with respect to each Adjustable Rate Mortgage Loan, the Gross Margin;

(31) with respect to each Adjustable Rate Mortgage Loan, the next Adjustment Date;

(32) with respect to each Adjustable Rate Mortgage Loan, the Periodic Rate Cap;

(33)	whether such Mortgage Loan is covered under one of the PMI Policies;
(34)	the credit score (“FICO”) of such Mortgage Loan; and
(35)	the total amount of points and fees charged such Mortgage Loan.

The Mortgage Loan Schedule shall set forth the following information with respect to the Mortgage Loans in the aggregate and for each Loan Group as of the Cut-off Date: (1) the number of Mortgage Loans (separately identifying the number of Fixed-Rate Mortgage Loans and the number of Adjustable-Rate Mortgage Loans); (2) the current Principal Balance of the Mortgage Loans; (3) the weighted average Mortgage Rate of the Mortgage Loans and (4) the weighted average maturity of the Mortgage Loans. The Mortgage Loan Schedule shall be amended from time to time by the Depositor in accordance with the provisions of this Agreement. With respect to any Qualified Substitute Mortgage Loan, the Cut-off Date shall refer to the related Cut-off Date for such Mortgage Loan, determined in accordance with the definition of Cut-off Date herein.

“Mortgage Note”: The original executed note or other evidence of the indebtedness of a Mortgagor under a Mortgage Loan.

“Mortgage Pool”: The pool of Mortgage Loans, identified on Schedule 1 and existing from time to time thereafter, and any REO Properties acquired in respect thereof.

“Mortgage Rate”: With respect to each Mortgage Loan, the annual rate at which interest accrues on such Mortgage Loan from time to time in accordance with the provisions of the related Mortgage Note, which rate with respect to the Adjustable-Rate Mortgage Loans, (A) as of any date of determination until the first Adjustment Date following the Cut-off Date shall be the rate set forth in the Mortgage Loan Schedule as the Mortgage Rate in effect immediately following the Cut-off Date and (B) as of any date of determination thereafter shall be the rate as adjusted on the most recent Adjustment Date equal to the sum, rounded to the nearest or next highest 0.125% as provided in the Mortgage Note, of the Index, as most recently available as of a date prior to the Adjustment Date as set forth in the related Mortgage Note, plus the related Gross Margin; provided that the Mortgage Rate on such Adjustable-Rate Mortgage Loan on any Adjustment Date shall never be more than the lesser of (i) the sum of the Mortgage Rate in effect immediately prior to the Adjustment Date plus the related Periodic Rate Cap, if any, and (ii) the related Maximum Mortgage Rate, and shall never be less than the greater of (i) the Mortgage Rate in effect immediately prior to the Adjustment Date less the Periodic Rate Cap, if any, and (ii) the related Minimum Mortgage Rate. With respect to each Mortgage Loan that becomes an REO Property, as of any date of determination, the annual rate determined in accordance with

the immediately preceding sentence as of the date such Mortgage Loan became an REO Property.

“Mortgaged Property”: The underlying property securing a Mortgage Loan, including any REO Property, consisting of an Estate in Real Property improved by a Residential Dwelling.

“Mortgagor”: The obligor on a Mortgage Note.

“Net Liquidation Proceeds”: With respect to any Liquidated Mortgage Loan or any other disposition of related Mortgaged Property (including REO Property) the related Liquidation Proceeds and Insurance Proceeds net of Advances, Servicing Advances, Servicing Fees and any other accrued and unpaid servicing fees received and retained in connection with the liquidation of such Mortgage Loan or Mortgaged Property.

“Net Monthly Excess Cashflow”: With respect to each Distribution Date, the sum of (a) any Overcollateralization Release Amount for such Distribution Date and (b) the excess of (x) Available Funds for such Distribution Date over (y) the sum for such Distribution Date of (A) the Monthly Interest Distributable Amounts for the Class A Certificates and the Mezzanine Certificates, (B) the Unpaid Interest Shortfall Amounts for the Class A Certificates and (C) the Principal Remittance Amount.

“Net Mortgage Rate”: With respect to any Mortgage Loan (or the related REO Property) as of any date of determination, a per annum rate of interest equal to the then applicable Mortgage Rate for such Mortgage Loan minus the Servicing Fee Rate.

“Net WAC Rate”: For any Distribution Date with respect to the Group I Certificates, a per annum rate equal to the product of (x) the weighted average of the Adjusted Net Mortgage Rates of the Group I Mortgage Loans, weighted based on their outstanding Principal Balances as of the first day of the calendar month preceding the month in which the Distribution Date occurs and (y) a fraction, the numerator of which is 30 and the denominator of which is the actual number of days elapsed in the related Accrual Period. For federal income tax purposes, the economic equivalent of such rate shall be expressed as the weighted average of the REMIC I Remittance Rate on REMIC I Regular Interest I-LT1GRP, weighted on the basis of the Uncertificated Balance of such REMIC I Regular Interest.

For any Distribution Date with respect to the Group II Certificates, a per annum rate equal to the product of (x) the weighted average of the Adjusted Net Mortgage Rates of the Group II Mortgage Loans, weighted based on their outstanding Principal Balances as of the first day of the calendar month preceding the month in which the Distribution Date occurs and (y) a fraction, the numerator of which is 30 and the denominator of which is the actual number of days elapsed in the related Accrual Period. For federal income tax purposes, the economic equivalent of such rate shall be expressed as the weighted average of the REMIC I Remittance Rate on REMIC I Regular Interest I-LT2GRP, weighted on the basis of the Uncertificated Balance of such REMIC I Regular Interest.

For any Distribution Date with respect to the Mezzanine Certificates, a per annum rate equal to the product of (x) the weighted average of the Adjusted Net Mortgage Rates of the Group I Mortgage Loans and the Group II Mortgage Loans, weighted in proportion to the results of subtracting from the aggregate Stated Principal Balance of each Loan Group the Certificate Principal Balance of the related Class of Class A Certificates and (y) for each Class of Mezzanine Certificates a fraction, the numerator of which is 30 and the denominator of which is the actual number of days elapsed in the related Accrual Period. For federal income tax purposes, the economic equivalent of such rate shall be expressed as the weighted average of the REMIC I Remittance Rates on (a) REMIC I Regular Interest I-LT1SUB, subject to a cap and a floor equal to the Adjusted Net Mortgage Rates of the Group I Mortgage Loans and (b) REMIC I Regular Interest I-LT2SUB, subject to a cap and a floor equal to the Adjusted Net Mortgage Rates of the Group II Mortgage Loans, weighted, in each case, on the basis of the Uncertificated Balance of each such REMIC I Regular Interest.

“Net WAC Rate Carryover Amount”: With respect to the Class A Certificates and the Mezzanine Certificates and any Distribution Date, the sum of (A) the positive excess of (i) the amount of interest accrued on such Class of Certificates on such Distribution Date calculated at the related Formula Rate, over (ii) the amount of interest accrued on such Class of Certificates at the related Net WAC Rate for such Distribution Date and (B) the Net WAC Rate Carryover Amount for the previous Distribution Date not previously paid, together with interest thereon at a rate equal to the Formula Rate for such Class of Certificates for such Distribution Date and for such Accrual Period.

“Net WAC Rate Carryover Reserve Account”: The account established and maintained pursuant to Section 3.28.

“New Lease”: Any lease of REO Property entered into on behalf of REMIC I, including any lease renewed or extended on behalf of REMIC I, if REMIC I has the right to renegotiate the terms of such lease.

“NIMS Insurer”: Any insurer that is guaranteeing certain payments under notes secured by collateral which includes all or a portion of the Class CE Certificates, the Class P Certificates and/or the Class R Certificates.

“Nonrecoverable Advance”: Any Advance previously made or proposed to be made in respect of a Mortgage Loan or REO Property that, in the good faith business judgment of the Master Servicer, will not or, in the case of a proposed Advance, would not be ultimately recoverable from related Late Collections, Insurance Proceeds or Liquidation Proceeds on such Mortgage Loan or REO Property as provided herein.

“Nonrecoverable Servicing Advance”: Any Servicing Advance previously made or proposed to be made in respect of a Mortgage Loan or REO Property that, in the good faith business judgment of the Master Servicer, will not or, in the case of a proposed Servicing Advance, would not be ultimately recoverable from related Late Collections, Insurance Proceeds or Liquidation Proceeds on such Mortgage Loan or REO Property as provided herein.

“Non-United States Person”: Any Person other than a United States Person.

“Notional Amount”: With respect to the Class CE Interest and any Distribution Date, the Uncertificated Balance of the REMIC I Regular Interests (other than REMIC I Regular Interest I-LTP) for such Distribution Date.

“Offered Certificates”: The Class A Certificates and the Mezzanine Certificates.

“Officers’ Certificate”: A certificate signed by the Chairman of the Board, the Vice Chairman of the Board, the President or a vice president (however denominated), and by the Treasurer, the Secretary, or one of the assistant treasurers or assistant secretaries of the Master Servicer, the Originator, the Seller or the Depositor, as applicable.

“One-Month LIBOR”: With respect to the Class A Certificates, the Mezzanine Certificates, REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10 and REMIC I Regular Interest I-LTM11 and any Accrual Period therefor, the rate determined by the Trustee on the related Interest Determination Date on the basis of the offered rate for one-month U.S. dollar deposits, as such rate appears on Telerate Page 3750 as of 11:00 a.m. (London time) on such Interest Determination Date; provided that if such rate does not appear on Telerate Page 3750, the rate for such date will be determined on the basis of the offered rates of the Reference Banks for one-month U.S. dollar deposits, as of 11:00 a.m. (London time) on such Interest Determination Date. In such event, the Trustee will request the principal London office of each of the Reference Banks to provide a quotation of its rate. If on such Interest Determination Date, two or more Reference Banks provide such offered quotations, One-Month LIBOR for the related Accrual Period shall be the arithmetic mean of such offered quotations (rounded upwards if necessary to the nearest whole multiple of 1/16%). If on such Interest Determination Date, fewer than two Reference Banks provide such offered quotations, One-Month LIBOR for the related Accrual Period shall be the higher of (i) LIBOR as determined on the previous Interest Determination Date and (ii) the Reserve Interest Rate. Notwithstanding the foregoing, if, under the priorities described above, LIBOR for an Interest Determination Date would be based on LIBOR for the previous Interest Determination Date for the third consecutive Interest Determination Date, the Trustee shall select, after consultation with the NIMS Insurer, an alternative comparable index (over which the Trustee has no control), used for determining one-month Eurodollar lending rates that is calculated and published (or otherwise made available) by an independent party.

“Opinion of Counsel”: A written opinion of counsel, who may, without limitation, be salaried counsel for the Depositor or the Master Servicer, acceptable to the Trustee, except that any opinion of counsel relating to (a) the qualification of any of Trust REMIC as a REMIC or (b) compliance with the REMIC Provisions must be an opinion of Independent counsel.

“Original Mortgage Loan”: Any of the Mortgage Loans included in REMIC I as of the Closing Date.

“Originator”: Option One Mortgage Corporation.

“Overcollateralization Deficiency Amount”: With respect to any Distribution Date, the amount, if any, by which the Overcollateralization Target Amount exceeds the Overcollateralized Amount on such Distribution Date (after giving effect to distributions in respect of the Group I Basic Principal Distribution Amount and the Group II Basic Principal Distribution Amount on such Distribution Date).

“Overcollateralization Release Amount”: With respect to any Distribution Date, the lesser of (x) the Principal Remittance Amount for such Distribution Date and (y) the Excess Overcollateralized Amount.

“Overcollateralization Target Amount”: With respect to any Distribution Date, (i) prior to the Stepdown Date, an amount equal to 0.70% of the aggregate Stated Principal Balance of the Mortgage Loans as of the Cut-off Date, (ii) on or after the Stepdown Date provided a Trigger Event is not in effect, the greater of (x) 1.40% of the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (y) $8,011,950.18 or (iii) on or after the Stepdown Date and if a Trigger Event is in effect, the Overcollateralization Target Amount for the immediately preceding Distribution Date.

“Overcollateralized Amount”: For any Distribution Date, the amount equal to (i) the aggregate Principal Balance of the Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) as of the related Determination Date minus (ii) the sum of the aggregate Certificate Principal Balance of the Class A Certificates, the Mezzanine Certificates and the Class P Certificates as of such Distribution Date after giving effect to distributions to be made on such Distribution Date.

“Ownership Interest”: As to any Certificate, any ownership or security interest in such Certificate, including any interest in such Certificate as the Holder thereof and any other interest therein, whether direct or indirect, legal or beneficial, as owner or as pledgee.

“Pass-Through Rate”: With respect to the Class A Certificates and the Mezzanine Certificates and any Distribution Date, a rate per annum equal to the lesser of (i) the related Formula Rate for such Distribution Date and (ii) the Net WAC Rate for such Distribution Date.

With respect to the Class CE Interest and any Distribution Date, a rate per annum equal to the percentage equivalent of a fraction, the numerator of which is the sum of the amounts calculated pursuant to clauses (A) through (S) below, and the denominator of which is the aggregate Uncertificated Balance of REMIC I Regular Interest I-LTAA, I-LTA1, I-LTA2, I-LTA3, I-LTA4, I-LTA5, I-LTM1, I-LTM2, I-LTM3, I-LTM4, I-LTM5, I-LTM6, I-LTM7, I-LTM8, I-LTM9, I-LTM10, I-LTM11 and I-LTZZ. For purposes of calculating the Pass-Through Rate for the Class CE Interest, the numerator is equal to the sum of the following components:

(A) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTAA minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTAA;

(B) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTA1 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTA1;

(C) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTA2 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTA2;

(D) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTA3 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTA3;

(E) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTA4 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTA4;

(F) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTA5 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTA5;

(G) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM1 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM1;

(H) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM2 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM2;

(I) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM3 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM3;

(J) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM4 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM4;

(K) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTMV5 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM5;

(L) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTMV6 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM6;

(M) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM7 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM7;

(N) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM8 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM8;

(O) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM9 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM9;

(P) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM10 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM10;

(Q) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTM11 minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTM11;

(R) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTZZ minus the Marker Rate, applied to an amount equal to the Uncertificated Balance of REMIC I Regular Interest I-LTZZ; and

(S)	100% of the interest on REMIC I Regular Interest I-LTP.

With respect to the Class CE Certificates, 100% of the interest distributable to the Class CE Interest, expressed as a per annum rate.

“Percentage Interest”: With respect to any Class of Certificates (other than the Residual Certificates), the undivided percentage ownership in such Class evidenced by such Certificate, expressed as a percentage, the numerator of which is the initial Certificate Principal Balance or Notional Amount represented by such Certificate and the denominator of which is the aggregate initial Certificate Principal Balance or Notional Amount of all of the Certificates of such Class. The Class A Certificates and the Mezzanine Certificates are issuable only in minimum Percentage Interests corresponding to minimum initial Certificate Principal Balances of $25,000 and integral multiples of $1.00 in excess thereof. The Class P Certificates are issuable only in Percentage Interests corresponding to initial Certificate Principal Balances of $20 and integral multiples thereof. The Class CE Certificates are issuable only in minimum Percentage Interests corresponding to minimum initial Certificate Principal Balances of $10,000 and integral multiples of $1.00 in excess thereof; provided, however, that a single Certificate of each such Class of Certificates may be issued having a Percentage Interest corresponding to the remainder of the aggregate initial Certificate Principal Balance or Notional Amount of such Class or to an otherwise authorized denomination for such Class plus such remainder. With respect to any Residual Certificate, the undivided percentage ownership in such Class evidenced by such Certificate, as set forth on the face of such Certificate. The Residual Certificates are issuable in Percentage Interests of 20% and multiples thereof.

“Periodic Rate Cap”: With respect to each Adjustable-Rate Mortgage Loan and any Adjustment Date therefor, the fixed percentage set forth in the related Mortgage Note, which is the maximum amount by which the Mortgage Rate for such Mortgage Loan may increase or decrease (without regard to the Maximum Mortgage Rate or the Minimum Mortgage Rate) on such Adjustment Date from the Mortgage Rate in effect immediately prior to such Adjustment Date.

“Permitted Investments”: Any one or more of the following obligations or securities acquired at a purchase price of not greater than par, regardless of whether issued or managed by the Depositor, the Master Servicer, the NIMS Insurer, the Trustee or any of their respective Affiliates or for which an Affiliate of the NIMS Insurer or Trustee serves as an advisor:

(i) direct obligations of, or obligations fully guaranteed as to timely payment of principal and interest by, the United States or any agency or instrumentality thereof, provided such obligations are backed by the full faith and credit of the United States;

(ii) (A) demand and time deposits in, certificates of deposit of, bankers’ acceptances issued by or federal funds sold by any depository institution or trust company (including the Trustee or its agent acting in their respective commercial capacities) incorporated under the laws of the United States of America or any state thereof and subject to supervision and examination by federal and/or state authorities, so long as, at the time of such investment or contractual commitment providing for such investment, such depository institution or trust company (or, if the only Rating Agency is S&P, in the case of the principal depository institution in a depository institution holding company, debt obligations of the depository institution holding company) or its ultimate parent has a short-term uninsured debt rating in the highest available rating category of Moody’s, Fitch and S&P and provided that each such investment has an original maturity of no more than 365 days; and provided further that, if the only Rating Agency is S&P and if the depository or trust company is a principal subsidiary of a bank holding company and the debt obligations of such subsidiary are not separately rated, the applicable rating shall be that of the bank holding company; and, provided further that, if the original maturity of such short-term obligations of a domestic branch of a foreign depository institution or trust company shall exceed 30 days, the short-term rating of such institution shall be A-1+ in the case of S&P if S&P is the Rating Agency; and (B) any other demand or time deposit or deposit which is fully insured by the FDIC;

(iii) repurchase obligations with a term not to exceed 30 days with respect to any security described in clause (i) above and entered into with a depository institution or trust company (acting as principal) rated A-1+ or higher by S&P, F-1+ or higher by Fitch and A2 or higher by Moody’s, provided, however, that collateral transferred pursuant to such repurchase obligation must be of the type described in clause (i) above and must (A) be valued daily at current market prices plus accrued interest, (B) pursuant to such valuation, be equal, at all times, to 105% of the cash transferred by the Trustee in exchange for such collateral and (C) be delivered to the Trustee or, if the Trustee is supplying the collateral, an agent for the Trustee, in such a manner as to accomplish perfection of a security interest in the collateral by possession of certificated securities;

(iv) securities bearing interest or sold at a discount that are issued by any corporation incorporated under the laws of the United States of America or any State thereof and that are rated by a Rating Agency in its highest long-term unsecured rating category at the time of such investment or contractual commitment providing for such investment;

(v) commercial paper (including both non-interest-bearing discount obligations and interest-bearing obligations payable on demand or on a specified date not more than 30 days after the date of acquisition thereof) that is rated by a Rating Agency in its highest short-term unsecured debt rating available at the time of such investment;

(vi) units of money market funds, including those managed or advised by the Trustee or its Affiliates, that have been rated “AAA” by S&P, “AAA” by Fitch (if so rated by Fitch) and “Aaa” by Moody’s; and

(vii) if previously confirmed in writing to the Trustee and consented to by the NIMS Insurer, any other demand, money market or time deposit, or any other obligation, security or investment, as may be acceptable to the Rating Agencies in writing as a permitted investment of funds backing securities having ratings equivalent to its highest initial rating of the Class A Certificates;

provided, that no instrument described hereunder shall evidence either the right to receive (a) only interest with respect to the obligations underlying such instrument or (b) both principal and interest payments derived from obligations underlying such instrument and the interest and principal payments with respect to such instrument provide a yield to maturity at par greater than 120% of the yield to maturity at par of the underlying obligations.

“Permitted Transferee”: Any Transferee of a Residual Certificate other than a Disqualified Organization or Non-United States Person.

“Person”: Any individual, corporation, partnership, limited liability company, joint venture, association, joint-stock company, trust, unincorporated organization or government or any agency or political subdivision thereof.

“Plan”: Any employee benefit plan or certain other retirement plans and arrangements, including individual retirement accounts and annuities, Keogh plans and bank collective investment funds and insurance company general or separate accounts in which such plans, accounts or arrangements are invested, that are subject to ERISA or Section 4975 of the Code.

“PMI Insurers”: Mortgage Guaranty Insurance Corporation, a Wisconsin stock insurance corporation, and Radian Guaranty Inc., a Pennsylvania corporation, or either of their successors in interest.

“PMI Insurer Fee”: The amount payable to each PMI Insurer on each Distribution Date, which amount shall equal (a) one twelfth of the product of (i) the related PMI Insurer Fee Rate, multiplied by (ii) the aggregate Principal Balance of the related PMI Mortgage Loans and any

related REO Properties as of the first day of the related Due Period (after giving effect to scheduled payments of principal due during the Due Period relating to the previous Distribution Date, to the extent received or advanced) plus (b) any taxes on related PMI Mortgage Loans located in West Virginia and Kentucky.

“PMI Insurer Fee Rate”: With respect to each PMI Mortgage Loan covered by the PMI Policy issued by Mortgage Guaranty Insurance Corporation, 1.09% per annum and with respect to each PMI Mortgage Loan that is covered by the PMI Policy issued by Radian Guaranty Inc., 0.90% per annum.

“PMI Mortgage Loans”: The list of Mortgage Loans insured by each of the PMI Insurer attached hereto as Schedule 3.

“PMI Policy”: With respect to the PMI Policy issued by Mortgage Guaranty Insurance Corporation, the primary mortgage insurance policy no. 22-400-4-3229 with respect to the related PMI Mortgage Loans, including all endorsements thereto dated the Closing Date, issued by Mortgage Guaranty Insurance Corporation and the Commitment Letter, dated May 10, 2005, among Mortgage Guaranty Insurance Corporation, the Seller and the Trustee.

With respect to the PMI Policy issued by Radian Guaranty Inc., the primary mortgage insurance policy no. 61368 (policy reference number: #05-998027) with respect to the related PMI Mortgage Loans, including all endorsements thereto dated the Closing Date, issued by Radian Guaranty Inc. and the Commitment Letter, dated May 12, 2005, between Radian Guaranty Inc. and the Seller.

“Prepayment Assumption”: As defined in the Prospectus Supplement.

“Prepayment Charge”: With respect to any Prepayment Period, any prepayment premium, fee, penalty or charge payable by a Mortgagor in connection with any full or partial Principal Prepayment on a Mortgage Loan pursuant to the terms of the related Mortgage Note (other than any Master Servicer Prepayment Charge Payment Amount).

“Prepayment Charge Schedule”: As of any date, the list of Prepayment Charges on the Mortgage Loans included in REMIC I on such date, attached hereto as Schedule 2 (including the Prepayment Charge Summary attached thereto). The Prepayment Charge Schedule shall set forth the following information with respect to each related Mortgage Loan:

(i)	the Mortgage Loan identifying number;
(ii)	a code indicating the type of Prepayment Charge;
(iii)	the state of origination of the related Mortgage Loan;

(iv) the date on which the first monthly payment was due on the related Mortgage Loan;

(v)	the term of the related Mortgage Loan; and

(vi)	the principal balance of the related Mortgage Loan as of the Cut-off Date.

The Prepayment Charge Schedule shall be amended from time to time by the Depositor in accordance with the provisions of this Agreement and a copy of such amended Prepayment Charge Schedule shall be furnished by the Master Servicer to the NIMS Insurer.

“Prepayment Interest Excess”: With respect to any Distribution Date, for each Mortgage Loan that was the subject of a Principal Prepayment in full during the portion of the related Prepayment Period occurring between the first day and the Determination Date of the calendar month in which such Distribution Date occurs, an amount equal to interest (to the extent received) at the applicable Net Mortgage Rate on the amount of such Principal Prepayment for the number of days commencing on the first day of the calendar month in which such Distribution Date occurs and ending on the date on which such prepayment is so applied.

“Prepayment Interest Shortfall”: With respect to any Distribution Date, for each Mortgage Loan that was the subject of a Principal Prepayment in full during the portion of the related Prepayment Period occurring between the first day of the related Prepayment Period and the last day of the calendar month preceding the month in which such Distribution Date occurs, an amount equal to interest at the applicable Net Mortgage Rate on the amount of such Principal Prepayment for the number of days commencing on the date on which the prepayment is applied and ending on the last day of the calendar month preceding the month in which such Distribution Date occurs. The obligations of the Master Servicer in respect of any Prepayment Interest Shortfall are set forth in Section 3.24.

“Prepayment Period”: With respect to any Distribution Date, the period commencing on the day after the Determination Date in the calendar month preceding the calendar month in which such Distribution Date occurs (or, in the case of the first Distribution Date, commencing on May 1, 2005) and ending on the Determination Date of the calendar month in which such Distribution Date occurs.

“Principal Balance”: As to any Mortgage Loan other than a Liquidated Mortgage Loan, and any day, the related Cut-off Date Principal Balance, minus all collections credited against the Cut-off Date Principal Balance of any such Mortgage Loan. For purposes of this definition, a Liquidated Mortgage Loan shall be deemed to have a Principal Balance equal to the Principal Balance of the related Mortgage Loan as of the final recovery of related Liquidation Proceeds and a Principal Balance of zero thereafter. As to any REO Property and any day, the Principal Balance of the related Mortgage Loan immediately prior to such Mortgage Loan becoming REO Property.

“Principal Prepayment”: Any payment of principal made by the Mortgagor on a Mortgage Loan which is received in advance of its scheduled Due Date and which is not accompanied by an amount of interest representing the full amount of scheduled interest due on any Due Date in any month or months subsequent to the month of prepayment.

“Principal Remittance Amount”: With respect to any Distribution Date, the sum of the Group I Principal Remittance Amount and the Group II Principal Remittance Amount.

“Prospectus Supplement”: That certain Prospectus Supplement dated May 10, 2005 relating to the public offering of the Class A Certificates and the Mezzanine Certificates.

“PTCE”: A Prohibited Transaction Class Exemption issued by the United States Department of Labor which provides that exemptive relief is available to any party to any transaction which satisfies the conditions of the exemption.

“Purchase Price”: With respect to any Mortgage Loan or REO Property to be purchased pursuant to or as contemplated by Section 2.03, Section 3.16(c) or Section 9.01, and as confirmed by an Officer’s Certificate from the Master Servicer and to the Trustee an amount equal to the sum of (i) 100% of the Stated Principal Balance thereof as of the date of purchase (or such other price as provided in Section 9.01), (ii) in the case of (x) a Mortgage Loan, accrued interest on such Stated Principal Balance at the applicable Net Mortgage Rate in effect from time to time from the Due Date as to which interest was last covered by a payment by the Mortgagor or an advance by the Master Servicer, which payment or advance had as of the date of purchase been distributed pursuant to Section 4.01, through the end of the calendar month in which the purchase is to be effected and (y) an REO Property, the sum of (1) accrued interest on such Stated Principal Balance at the applicable Net Mortgage Rate in effect from time to time from the Due Date as to which interest was last covered by a payment by the Mortgagor or an advance by the Master Servicer through the end of the calendar month immediately preceding the calendar month in which such REO Property was acquired, plus (2) REO Imputed Interest for such REO Property for each calendar month commencing with the calendar month in which such REO Property was acquired and ending with the calendar month in which such purchase is to be effected, net of the total of all net rental income, Insurance Proceeds, Liquidation Proceeds and Advances that as of the date of purchase had been distributed as or to cover REO Imputed Interest pursuant to Section 4.01, (iii) any unreimbursed Servicing Advances and Advances (including Nonrecoverable Advances and Nonrecoverable Servicing Advances) and any unpaid Servicing Fees allocable to such Mortgage Loan or REO Property, (iv) any amounts previously withdrawn from the Collection Account in respect of such Mortgage Loan or REO Property pursuant to Section 3.11(a)(ix) and Section 3.16(b), and (v) in the case of a Mortgage Loan required to be purchased pursuant to Section 2.03, expenses reasonably incurred or to be incurred by the Master Servicer, the NIMS Insurer or the Trustee in respect of the breach or defect giving rise to the purchase obligation including any costs and damages incurred by the Trust in connection with any violation by such loan of any predatory or abusive lending law.

“Qualified Substitute Mortgage Loan”: A mortgage loan substituted for a Deleted Mortgage Loan pursuant to the terms of this Agreement which must, on the date of such substitution, (i) have an outstanding Principal Balance, after application of all scheduled payments of principal and interest due during or prior to the month of substitution, not in excess of the Principal Balance of the Deleted Mortgage Loan as of the Due Date in the calendar month during which the substitution occurs, (ii) have a Mortgage Rate not less than (and not more than one percentage point in excess of) the Mortgage Rate of the Deleted Mortgage Loan, (iii) with respect to any Adjustable-Rate Mortgage Loan, have a Maximum Mortgage Rate not less than the Maximum Mortgage Rate on the Deleted Mortgage Loan, (iv) with respect to any Adjustable-Rate Mortgage Loan, have a Minimum Mortgage Rate not less than the Minimum Mortgage Rate of the Deleted Mortgage Loan, (v) with respect to any Adjustable-Rate Mortgage Loan, have a Gross Margin equal to the Gross Margin of the Deleted Mortgage Loan, (vi) with

respect to any Adjustable-Rate Mortgage Loan, have a next Adjustment Date not more than two months later than the next Adjustment Date on the Deleted Mortgage Loan, (vii) have a remaining term to maturity not greater than (and not more than one year less than) that of the Deleted Mortgage Loan, (viii) have the same Due Date as the Due Date on the Deleted Mortgage Loan, (ix) have a Loan-to-Value Ratio as of the date of substitution equal to or lower than the Loan-to-Value Ratio of the Deleted Mortgage Loan as of such date, (x) have a risk grading determined by the Originator at least equal to the risk grading assigned on the Deleted Mortgage Loan, (xi) have a Prepayment Charge provision at least equal to the Prepayment Charge provision in the Deleted Mortgage Loan, (xii) be covered by a PMI Policy if the Deleted Mortgage Loan was covered by a PMI Policy and (xiii) conform to each representation and warranty set forth in Section 6 of the Mortgage Loan Purchase Agreement applicable to the Deleted Mortgage Loan. In the event that one or more mortgage loans are substituted for one or more Deleted Mortgage Loans, the amounts described in clause (i) hereof shall be determined on the basis of aggregate principal balances, the Mortgage Rates described in clause (ii) hereof shall be determined on the basis of weighted average Mortgage Rates, the terms described in clause (vii) hereof shall be determined on the basis of weighted average remaining term to maturity, the Loan-to-Value Ratios described in clause (ix) hereof shall be satisfied as to each such mortgage loan, the risk gradings described in clause (x) hereof shall be satisfied as to each such mortgage loan and, except to the extent otherwise provided in this sentence, the representations and warranties described in clause (xiii) hereof must be satisfied as to each Qualified Substitute Mortgage Loan or in the aggregate, as the case may be.

“Rating Agency or Rating Agencies”: Fitch, Moody’s and S&P or their successors. If such agencies or their successors are no longer in existence, “Rating Agencies” shall be such nationally recognized statistical rating agencies, or other comparable Persons, designated by the Depositor, notice of which designation shall be given to the Trustee and the Master Servicer.

“Realized Loss”: With respect to each Mortgage Loan as to which a Final Recovery Determination has been made, an amount (not less than zero) equal to (i) the unpaid Principal Balance of such Mortgage Loan as of the commencement of the calendar month in which the Final Recovery Determination was made, plus (ii) accrued interest from the Due Date as to which interest was last paid by the Mortgagor through the end of the calendar month in which such Final Recovery Determination was made, calculated in the case of each calendar month during such period (A) at an annual rate equal to the annual rate at which interest was then accruing on such Mortgage Loan and (B) on a principal amount equal to the Stated Principal Balance of such Mortgage Loan as of the close of business on the Distribution Date during such calendar month, plus (iii) any amounts previously withdrawn from the Collection Account in respect of such Mortgage Loan pursuant to Section 3.11(a)(ix) and Section 3.16(b), minus (iv) the proceeds, if any, received in respect of such Mortgage Loan during the calendar month in which such Final Recovery Determination was made, net of amounts that are payable therefrom to the Master Servicer with respect to such Mortgage Loan pursuant to Section 3.11(a)(iii).

With respect to any REO Property as to which a Final Recovery Determination has been made, an amount (not less than zero) equal to (i) the unpaid principal balance of the related Mortgage Loan as of the date of acquisition of such REO Property on behalf of REMIC I, plus (ii) accrued interest from the Due Date as to which interest was last paid by the Mortgagor

in respect of the related Mortgage Loan through the end of the calendar month immediately preceding the calendar month in which such REO Property was acquired, calculated in the case of each calendar month during such period (A) at an annual rate equal to the annual rate at which interest was then accruing on the related Mortgage Loan and (B) on a principal amount equal to the Stated Principal Balance of the related Mortgage Loan as of the close of business on the Distribution Date during such calendar month, plus (iii) REO Imputed Interest for such REO Property for each calendar month commencing with the calendar month in which such REO Property was acquired and ending with the calendar month in which such Final Recovery Determination was made, plus (iv) any amounts previously withdrawn from the Collection Account in respect of the related Mortgage Loan pursuant to Section 3.11(a)(ix) and Section 3.16(b), minus (v) the aggregate of all Advances and Servicing Advances (in the case of Servicing Advances, without duplication of amounts netted out of the rental income, Insurance Proceeds and Liquidation Proceeds described in clause (vi) below) made by the Master Servicer in respect of such REO Property or the related Mortgage Loan for which the Master Servicer has been or, in connection with such Final Recovery Determination, will be reimbursed pursuant to Section 3.23 out of rental income, Insurance Proceeds and Liquidation Proceeds received in respect of such REO Property, minus (vi) the total of all net rental income, Insurance Proceeds and Liquidation Proceeds received in respect of such REO Property that has been, or in connection with such Final Recovery Determination, will be transferred to the Distribution Account pursuant to Section 3.23.

With respect to each Mortgage Loan which has become the subject of a Deficient Valuation, the difference between the principal balance of the Mortgage Loan outstanding immediately prior to such Deficient Valuation and the principal balance of the Mortgage Loan as reduced by the Deficient Valuation.

With respect to each Mortgage Loan which has become the subject of a Debt Service Reduction, the portion, if any, of the reduction in each affected Monthly Payment attributable to a reduction in the Mortgage Rate imposed by a court of competent jurisdiction. Each such Realized Loss shall be deemed to have been incurred on the Due Date for each affected Monthly Payment.

If the Master Servicer receives Subsequent Recoveries with respect to any Mortgage Loan, the amount of the Realized Loss with respect to that Mortgage Loan will be reduced to the extent such recoveries are applied to principal distributions on any Distribution Date.

“Record Date”: With respect to each Distribution Date and any Book-Entry Certificate, the Business Day immediately preceding such Distribution Date. With respect to each Distribution Date and any other Certificates and any Definitive Certificates, the last Business Day of the month immediately preceding the month in which such Distribution Date occurs.

“Reference Banks”: Deutsche Bank AG, Barclay’s Bank PLC, The Tokyo Mitsubishi Bank and National Westminster Bank PLC and their successors in interest; provided, however, that if any of the foregoing banks are not suitable to serve as a Reference Bank, then any leading banks selected by the Trustee (after consultation with the NIMS Insurer) which are

engaged in transactions in Eurodollar deposits in the international Eurocurrency market (i) with an established place of business in London, (ii) not controlling, under the control of or under common control with the Depositor or any Affiliate thereof and (iii) which have been designated as such by the Trustee.

“Refinanced Mortgage Loan”: A Mortgage Loan the proceeds of which were not used to purchase the related Mortgaged Property.

“Regular Certificate”: Any Class A Certificate, Mezzanine Certificate, Class CE Certificate or Class P Certificate.

“Regular Interest”: A “regular interest” in a REMIC within the meaning of Section 860G(a)(1) of the Code.

“Relief Act”: The Servicemembers Civil Relief Act.

“Relief Act Interest Shortfall”: With respect to any Distribution Date and any Mortgage Loan, any reduction in the amount of interest collectible on such Mortgage Loan for the most recently ended calendar month as a result of the application of the Relief Act.

“REMIC”: A “real estate mortgage investment conduit” within the meaning of Section 860D of the Code.

“REMIC I”: The segregated pool of assets subject hereto, constituting the primary trust created hereby and to be administered hereunder, with respect to which a REMIC election is to be made, consisting of: (i) such Mortgage Loans and Prepayment Charges as from time to time are subject to this Agreement, together with the Mortgage Files relating thereto, and together with all collections thereon and proceeds thereof; (ii) any REO Property, together with all collections thereon and proceeds thereof; (iii) the Trustee’s rights with respect to the Mortgage Loans under all insurance policies, including the PMI Policies, required to be maintained pursuant to this Agreement and any proceeds thereof; (iv) the Depositor’s rights under the Mortgage Loan Purchase Agreement (including any security interest created thereby); (v) the Collection Account (other than any amounts representing any Master Servicer Prepayment Charge Payment Amount), the Distribution Account (other than any amounts representing any Master Servicer Prepayment Charge Payment Amount) and any REO Account, and such assets that are deposited therein from time to time and any investments thereof, together with any and all income, proceeds and payments with respect thereto. Notwithstanding the foregoing, however, REMIC I specifically excludes the Net WAC Rate Carryover Reserve Account, the Cap Contracts, the Master Servicer Prepayment Charge Payment Amounts, all payments and other collections of principal and interest due on the Mortgage Loans on or before the Cut-off Date and all Prepayment Charges payable in connection with Principal Prepayments made before the Cut-off Date.

“REMIC I Interest Loss Allocation Amount”: With respect to any Distribution Date, an amount (subject to adjustment based on the actual number of days elapsed in the respective Accrual Periods for the indicated Regular Interests for such Distribution Date) equal to (a) the product of (i) 50% of the aggregate Stated Principal Balance of the Mortgage Loans

and REO Properties then outstanding and (ii) the REMIC I Remittance Rate for REMIC I Regular Interest I-LTAA minus the Marker Rate, divided by (b) 12.

“REMIC I Marker Allocation Percentage”: 50% of any amount payable or loss attributable from the Mortgage Loans, which shall be allocated to REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10, REMIC I Regular Interest I-LTM11, REMIC I Regular Interest I-LTZZ and REMIC I Regular Interest I-LTP.

“REMIC I Overcollateralized Amount”: With respect to any date of determination, (i) 0.50% of the aggregate Uncertificated Balances of the REMIC I Regular Interests minus (ii) the aggregate of the Uncertificated Balances of REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10 and REMIC I Regular Interest I-LTM11, in each case as of such date of determination.

“REMIC I Principal Loss Allocation Amount”: With respect to any Distribution Date, an amount equal to the product of (i) 50% of the aggregate Stated Principal Balance of the Mortgage Loans and REO Properties then outstanding and (ii) 1 minus a fraction, the numerator of which is two times the aggregate of the Uncertificated Balances of REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10 and REMIC I Regular Interest I-LTM11 and the denominator of which is the aggregate of the Uncertificated Balances of REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10, REMIC I Regular Interest I-LTM11 and REMIC I Regular Interest I-LTZZ.

“REMIC I Regular Interest”: Any of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a “regular interest” in REMIC I. Each REMIC I Regular Interest shall accrue interest at the related REMIC I

Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto. The designations for the respective REMIC I Regular Interests are set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTAA”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTAA shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTA1”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTA1 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTA2”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTA2 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTA3”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTA3 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTA4”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTA4 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTA5”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTA5 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM1”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM1 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM2”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM2 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM3”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM3 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM4”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM4 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM5”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM5 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM6”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM6 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM7”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM7 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal,

subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM8”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM8 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM9”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM9 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM10”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM10 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTM11”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTM11 shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTP”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTP shall be entitled to any Prepayment Charges collected by the Master Servicer and to a distribution of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTZZ”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTZZ shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LT1SUB”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest

in REMIC I. REMIC I Regular Interest I-LT1SUB shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LT1GRP”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LT1GRP shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LT2SUB”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LT2SUB shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LT2GRP”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LT2GRP shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Regular Interest I-LTXX”: One of the separate non-certificated beneficial ownership interests in REMIC I issued hereunder and designated as a Regular Interest in REMIC I. REMIC I Regular Interest I-LTXX shall accrue interest at the related REMIC I Remittance Rate in effect from time to time, and shall be entitled to distributions of principal, subject to the terms and conditions hereof, in an aggregate amount equal to its initial Uncertificated Balance as set forth in the Preliminary Statement hereto.

“REMIC I Remittance Rate”: With respect to REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10, REMIC I Regular Interest I-LTM11, REMIC I Regular Interest I-LTZZ, REMIC I Regular Interest I-LTP, REMIC I Regular Interest I-LT1SUB, REMIC I Regular Interest I-LT2SUB and REMIC I Regular Interest I-LTXX, the weighted average of the Adjusted Net Mortgage Rates of the Mortgage Loans. With respect to REMIC I Regular Interest I-LT1GRP, the weighted average of the Adjusted Net Mortgage Rates of the Group I Mortgage Loans and with respect REMIC I Regular Interest I-LT2GRP, the weighted average of the Adjusted Net Mortgage Rates of the Group II Mortgage Loans.

“REMIC I Subordinated Balance Ratio”: The ratio among the Uncertificated Balances of each REMIC I Regular Interest ending with the designation “SUB,”, equal to the ratio among, with respect to each such REMIC I Regular Interest, the excess of (x) the aggregate Stated Principal Balance of the Mortgage Loans in the related Loan Group over (y) the Current Principal Amount of the Class A Certificates in the related Loan Group.

“REMIC I Sub WAC Allocation Percentage”: 50% of any amount payable from or loss attributable to the Mortgage Loans, which shall be allocated to REMIC I Regular Interest I-LT1SUB, REMIC I Regular Interest I-LT1GRP, REMIC I Regular Interest I-LT2SUB, REMIC I Regular Interest I-LT2GRP and REMIC I Regular Interest I-LTXX.

“REMIC I Required Overcollateralized Amount”: 0.50% of the Overcollateralization Target Amount.

“REMIC II”: The segregated pool of assets consisting of all of the REMIC I Regular Interests conveyed in trust to the Trustee, for the benefit of the REMIC II Certificateholders pursuant to Section 2.07, and all amounts deposited therein, with respect to which a separate REMIC election is to be made.

“REMIC II Certificate”: Any Regular Certificate (other than the Class CE Certificates or Class P Certificates) or Class R Certificate.

“REMIC II Certificateholder”: The Holder of any REMIC II Certificate.

“REMIC II Regular Interest”: Any Class A Certificate, Mezzanine Certificate, the Class CE Interest or the Class P Interest.

“REMIC III”: The segregated pool of assets consisting of all of the Class CE Interest conveyed in trust to the Trustee, for the benefit of the Holders of the Regular Certificates and the Class R-X Certificate (in respect of the Class R-III Interest), pursuant to Article II hereunder, and all amounts deposited therein, with respect to which a separate REMIC election is to be made.

“REMIC IV”: The segregated pool of assets consisting of all of the Class P Interest conveyed in trust to the Trustee, for the benefit of the Holders of the Regular Certificates and the Class R-X Certificate (in respect of the Class R-IV Interest), pursuant to Article II hereunder, and all amounts deposited therein, with respect to which a separate REMIC election is to be made.

“REMIC Provisions”: Provisions of the federal income tax law relating to real estate mortgage investment conduits, which appear at Section 860A through 860G of the Code, and related provisions, and proposed, temporary and final regulations and published rulings, notices and announcements promulgated thereunder, as the foregoing may be in effect from time to time.

“REMIC Regular Interests”: The REMIC 1 Regular Interests, the REMIC 2 Regular Interests, the Class CE Interest and the Class P Interest.

“Remittance Report”: A report prepared by the Master Servicer and delivered to the Trustee and the NIMS Insurer pursuant to Section 4.03.

“Rents from Real Property”: With respect to any REO Property, gross income of the character described in Section 856(d) of the Code as being included in the term “rents from real property.”

“REO Account”: The account or accounts maintained, or caused to be maintained, by the Master Servicer in respect of an REO Property pursuant to Section 3.23.

“REO Disposition”: The sale or other disposition of an REO Property on behalf of REMIC I.

“REO Imputed Interest”: As to any REO Property, for any calendar month during which such REO Property was at any time part of REMIC I, one month’s interest at the applicable Net Mortgage Rate on the Stated Principal Balance of such REO Property (or, in the case of the first such calendar month, of the related Mortgage Loan, if appropriate) as of the close of business on the Distribution Date in such calendar month.

“REO Property”: A Mortgaged Property acquired by the Master Servicer on behalf of REMIC I through foreclosure or deed-in-lieu of foreclosure, as described in Section 3.23.

“Request for Release”: A release signed by a Servicing Officer, in the form of Exhibit E attached hereto.

“Reserve Interest Rate”: With respect to any Interest Determination Date, the rate per annum that the Trustee determines to be either (i) the arithmetic mean (rounded upwards if necessary to the nearest whole multiple of 1/16%) of the one-month U.S. dollar lending rates which New York City banks selected by the Trustee are quoting on the relevant Interest Determination Date to the principal London offices of leading banks in the London interbank market or (ii) in the event that the Trustee can determine no such arithmetic mean, the lowest one-month U.S. dollar lending rate which New York City banks selected by the Trustee are quoting on such Interest Determination Date to leading European banks.

“Residential Dwelling”: Any one of the following: (i) a detached one-family dwelling, (ii) a detached two- to four-family dwelling, (iii) a one-family dwelling unit in a Fannie Mae eligible condominium project, (iv) a manufactured home, or (v) a detached one-family dwelling in a planned unit development, none of which is a co-operative or mobile home.

“Residual Certificate”: Any one of the Class R Certificates or the Class R-X Certificates.

“Residual Interest”: The sole class of “residual interests” in a REMIC within the meaning of Section 860G(a)(2) of the Code.

“Responsible Officer”: When used with respect to the Trustee, the Chairman or Vice Chairman of the Board of Directors or Trustees, the Chairman or Vice Chairman of the

Executive or Standing Committee of the Board of Directors or Trustees, the President, the Chairman of the Committee on Trust Matters, any vice president, any assistant vice president, the Secretary, any assistant secretary, the Treasurer, any assistant treasurer, the Cashier, any assistant cashier, any trust officer or assistant trust officer, the Controller and any assistant controller or any other officer of the Trustee, customarily performing functions similar to those performed by any of the above designated officers and, with respect to a particular matter, to whom such matter is referred because of such officer’s knowledge of and familiarity with the particular subject.

“S&P”: Standard & Poor’s Ratings Services, a division of The McGraw-Hill Companies, Inc., or its successor in interest.

“Seller”: UBS Real Estate Securities Inc. or its successor in interest, in its capacity as seller under the Mortgage Loan Purchase Agreement.

“Senior Group I Principal Distribution Amount”: The excess of (x) the aggregate Certificate Principal Balance of the Group I Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 68.60% and (ii) the aggregate Stated Principal Balance of the Group I Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Stated Principal Balance of the Group I Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $4.394,431.00.

“Senior Group II Principal Distribution Amount”: The excess of (x) the aggregate Certificate Principal Balance of the Group II Certificates immediately prior to such Distribution Date over (y) the lesser of (A) the product of (i) 68.60% and (ii) the aggregate Stated Principal Balance of the Group II Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and (B) the excess of the aggregate Stated Principal Balance of the Group II Mortgage Loans as of the last day of the related Due Period (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) over $3,617,519.18.

“Sequential Trigger Event”: A Sequential Trigger Event will be in effect if, with respect to any Distribution Date before the 37^th Distribution Date, the aggregate amount of Realized Losses incurred since the Cut-off Date through the last day of the related Due Period (reduced by Subsequent Recoveries received through the last day of such Due Period) divided by the aggregate Stated Principal Balance of the Mortgage Loans as of the Cut-off Date exceeds 2.00%, or if, on or after the 37^th Distribution Date, a Trigger Event is in effect.

“Servicing Account”: The account or accounts created and maintained pursuant to Section 3.09.

“Servicing Advances”: All customary, reasonable and necessary “out of pocket” costs and expenses (including reasonable attorneys’ fees and expenses) incurred by the Master Servicer in the performance of its servicing obligations, including, but not limited to, the cost of (i) the preservation, restoration, inspection and protection of the Mortgaged Property, (ii) any enforcement or judicial proceedings, including foreclosures, (iii) the management and liquidation of the REO Property and (iv) compliance with the obligations under Sections 3.01, 3.09, 3.16, and 3.23.

“Servicing Fee”: With respect to each Mortgage Loan and for any calendar month, an amount equal to one month’s interest (or in the event of any payment of interest which accompanies a Principal Prepayment in full or in part made by the Mortgagor during such calendar month, interest for the number of days covered by such payment of interest) at the Servicing Fee Rate on the same principal amount on which interest on such Mortgage Loan accrues for such calendar month. A portion of such Servicing Fee may be retained by any Sub-Servicer as its servicing compensation.

“Servicing Fee Rate”: 0.30% per annum for the first 10 Due Periods, 0.40% per annum for the 11^th through 30^th Due Periods and 0.65% per annum for all Due Periods thereafter, in each case, on the Principal Balance of each Mortgage Loan.

“Servicing Officer”: Any representative of the Master Servicer involved in, or responsible for, the administration and servicing of Mortgage Loans, whose name and specimen signature appear on a list of Servicing Officers furnished by the Master Servicer to the Trustee and the Depositor on the Closing Date, as such list may from time to time be amended.

“Servicing Standard”: Shall mean the standards set forth in Section 3.01.

“Servicing Transfer Costs”: Shall mean all reasonable costs and expenses incurred by the Trustee in connection with the transfer of servicing from a predecessor servicer, including, without limitation, any reasonable costs or expenses associated with the complete transfer of all servicing data and the completion, correction or manipulation of such servicing data as may be required by the Trustee to correct any errors or insufficiencies in the servicing data or otherwise to enable the Trustee to service the Mortgage Loans properly and effectively.

“Single Certificate”: With respect to any Class of Certificates (other than the Class P Certificates and the Residual Certificates), a hypothetical Certificate of such Class evidencing a Percentage Interest for such Class corresponding to an initial Certificate Principal Balance of $1,000. With respect to the Class P Certificates and the Residual Certificates, a hypothetical Certificate of such Class evidencing a 100% Percentage Interest in such Class.

“Startup Day”: With respect to each Trust REMIC, the day designated as such pursuant to Section 10.01(b) hereof.

“Stated Principal Balance”: With respect to any Mortgage Loan: (a) as of any date of determination up to but not including the Distribution Date on which the proceeds, if any, of a Liquidation Event with respect to such Mortgage Loan would be distributed, the Cut-off Date Principal Balance of such Mortgage Loan, as shown in the Mortgage Loan Schedule, minus the sum of (i) the principal portion of each Monthly Payment due on a Due Date subsequent to the Cut-off Date, to the extent received from the Mortgagor or advanced by the Master Servicer and distributed pursuant to Section 4.01 on or before such date of determination, (ii) all Principal Prepayments received after the Cut-off Date, to the extent distributed pursuant to Section 4.01 on or before such date of determination, (iii) all Liquidation Proceeds and Insurance Proceeds applied by the Master Servicer as recoveries of principal in accordance with the provisions of Section 3.16, to the extent distributed pursuant to Section 4.01 on or before such date of determination, and (iv) any Realized Loss incurred with respect thereto as a result of a Deficient Valuation made during or prior to the Prepayment Period for the most recent Distribution Date coinciding with or preceding such date of determination; and (b) as of any date of determination coinciding with or subsequent to the Distribution Date on which the proceeds, if any, of a Liquidation Event with respect to such Mortgage Loan would be distributed, zero. With respect to any REO Property: (a) as of any date of determination up to but not including the Distribution Date on which the proceeds, if any, of a Liquidation Event with respect to such REO Property would be distributed, an amount (not less than zero) equal to the Stated Principal Balance of the related Mortgage Loan as of the date on which such REO Property was acquired on behalf of REMIC I, minus if such REO Property was acquired before the Distribution Date in any calendar month, the principal portion of the Monthly Payment due on the Due Date in the calendar month of acquisition, to the extent advanced by the Master Servicer and distributed pursuant to Section 4.01 on or before such date of determination; and (b) as of any date of determination coinciding with or subsequent to the Distribution Date on which the proceeds, if any, of a Liquidation Event with respect to such REO Property would be distributed, zero.

“Stepdown Date”: The earlier to occur of (i) the Distribution Date on which the aggregate Certificate Principal Balance of the Class A Certificates is zero and (ii) the later to occur of (x) the Distribution Date occurring in June 2008 and (y) the first Distribution Date on which the Credit Enhancement Percentage (calculated for this purpose only after taking into account distributions of principal on the Mortgage Loans but prior to distribution of the Group I Principal Distribution Amount and the Group II Principal Distribution Amount to the Holders of the Certificates then entitled to distributions of principal on such Distribution Date) is greater than or equal to 31.40%.

“Sub-Servicer”: Any Person with which the Master Servicer has entered into a Sub-Servicing Agreement and which meets the qualifications of a Sub-Servicer pursuant to Section 3.02.

“Sub-Servicing Account”: An account established by a Sub-Servicer which meets the requirements set forth in Section 3.08 and is otherwise acceptable to the Master Servicer.

“Sub-Servicing Agreement”: The written contract between the Master Servicer and a Sub-Servicer relating to servicing and administration of certain Mortgage Loans as provided in Section 3.02.

“Subsequent Recoveries”: As of any Distribution Date, amounts received by the Servicer (net of any related expenses permitted to be reimbursed pursuant to Section 3.11) specifically related to a Mortgage Loan that was the subject of a liquidation or an REO Disposition prior to the related Prepayment Period that resulted in a Realized Loss.

“Substitution Adjustment Amount”: As defined in Section 2.03(b).

“Tax Returns”: The federal income tax return on Internal Revenue Service Form 1066, U.S. Real Estate Mortgage Investment Conduit Income Tax Return, including Schedule Q thereto, Quarterly Notice to Residual Interest Holders of REMIC Taxable Income or Net Loss Allocation, or any successor forms, to be filed on behalf of the Trust Fund due to the classification of portions thereof as REMICs under the REMIC Provisions, together with any and all other information reports or returns that may be required to be furnished to the Certificateholders or filed with the Internal Revenue Service or any other governmental taxing authority under any applicable provisions of federal, state or local tax laws.

“Telerate Page 3750”: The display designated as page “3750” on the Dow Jones Telerate Capital Markets Report (or such other page as may replace page 3750 on that report for the purpose of displaying London interbank offered rates of major banks).

“Termination Price”: As defined in Section 9.01.

“Terminator”: As defined in Section 9.01.

“Three Month Rolling Delinquency Percentage”: With respect to the Mortgage Loans and any Distribution Date, the average for the three most recent calendar months of the fraction, expressed as a percentage, the numerator of which is (x) the sum (without duplication) of the aggregate of the Principal Balances of all Mortgage Loans that are (i) 60 or more days Delinquent, (ii) in bankruptcy and 60 or more days Delinquent, (iii) in foreclosure and 60 or more days Delinquent or (iv) REO Properties, and the denominator of which is (y) the sum of the Principal Balances of the Mortgage Loans, in the case of both (x) and (y), as of the Close of Business on the last Business Day of each of the three most recent calendar months.

“Transfer”: Any direct or indirect transfer, sale, pledge, hypothecation, or other form of assignment of any Ownership Interest in a Certificate.

“Transferee”: Any Person who is acquiring by Transfer any Ownership Interest in a Certificate.

“Transferor”: Any Person who is disposing by Transfer of any Ownership Interest in a Certificate.

“Trigger Event”: A Trigger Event is in effect with respect to any Distribution Date on or after the Stepdown Date if:

(a) the percentage obtained by dividing (x) the aggregate Stated Principal Balance of Mortgage Loans Delinquent 60 days or more or are in foreclosure, have been converted to REO Properties or have been discharged by reason of bankruptcy by (y) the aggregate Stated Principal

Balance of the Mortgage Loans, in each case, as of the last day of the previous calendar month, exceeds 48.00% of the Credit Enhancement Percentage; or

(b) the aggregate amount of Realized Losses incurred since the Cut-off Date through the last day of the related Due Period (reduced by the aggregate amount of Subsequent Recoveries received since the Cut-off Date through the last day of the related Due Period) divided by the aggregate Principal Balance of the Mortgage Loans as of the Cut-off Date exceeds the applicable percentages set forth below with respect to such Distribution Date:

Distribution Date Occurring In	Percentage
June 2008 through May 2009	2.00% for the first month plus an additional 1/12^th of 0.50% each month thereafter.
June 2009 through May 2010	2.50% for the first month plus an additional 1/12^th of 0.50% each month thereafter.
June 2010 through May 2011	3.00% for the first month plus an additional 1/12^th of 0.50% each month thereafter.
June 2011 and thereafter	3.25% for the first month plus an additional 1/12^th of 0.50% each month thereafter.

“Trust”: MASTR Asset Backed Securities Trust 2005-OPT1.

“Trust Fund”: Collectively, all of the assets of REMIC I, REMIC II, REMIC III, REMIC IV, the Net WAC Rate Carryover Reserve Account (including any payments made under the Cap Contracts deposited therein) and the other assets conveyed by the Depositor to the Trustee pursuant to Section 2.01.

“Trust REMIC”: Any of REMIC I, REMIC II, REMIC III or REMIC IV.

“Trustee”: Wells Fargo Bank, N.A., a national banking association, or its successor in interest, or any successor trustee appointed as herein provided.

“Trustee Fee”: The amount payable to the Trustee on each Distribution Date pursuant to Section 8.05 as compensation for all services rendered by it in the execution of the trust hereby created and in the exercise and performance of any of the powers and duties of the Trustee hereunder, which amount shall equal the product of (x) one-twelfth of the Trustee Fee Rate and (y) the aggregate Stated Principal Balance of the Mortgage Loans as of the last day of the related Due Period (or, in the case of the initial Distribution Date, as of the Cut-off Date), calculated on the basis of a 360-day year consisting of twelve 30-day months.

“Trustee Fee Rate”: 0.0035% per annum.

“Uncertificated Balance”: The amount of any REMIC Regular Interest outstanding as of any date of determination. As of the Closing Date, the Uncertificated Balance of each REMIC Regular Interest shall equal the amount set forth in the Preliminary Statement hereto as its initial uncertificated balance. On each Distribution Date, the Uncertificated Balance of each REMIC Regular Interest shall be reduced by all distributions of principal made on such REMIC Regular Interest on such Distribution Date pursuant to Section 4.01 and, if and to the extent necessary and appropriate, shall be further reduced on such Distribution Date by Realized Losses as provided in Section 4.04. The Uncertificated Balance of REMIC I Regular Interest I-LTZZ shall be increased by interest deferrals as provided in Section 4.01(a)(1)(i). The Uncertificated Balance of each REMIC Regular Interest shall never be less than zero. With respect to the Class CE Interest as of any date of determination, an amount equal to the excess, if

any, of (A) the then aggregate Uncertificated Principal Balances of the REMIC I Regular Interests over (B) the then aggregate Certificate Principal Balances of the Class A Certificates, Mezzanine Certificates and the Class P Interest then outstanding.

“Uncertificated Interest”: With respect to any REMIC Regular Interest for any Distribution Date, one month’s interest at the REMIC Remittance Rate applicable to such REMIC I Regular Interest for such Distribution Date, accrued on the Uncertificated Balance thereof immediately prior to such Distribution Date. Uncertificated Interest in respect of any REMIC I Regular Interest shall accrue on the basis of a 360-day year consisting of twelve 30-day months. Uncertificated Interest with respect to each Distribution Date, as to any REMIC Regular Interest, shall be reduced by an amount equal to the sum of (a) the aggregate Prepayment Interest Shortfall, if any, for such Distribution Date to the extent not covered by payments pursuant to Section 3.24 and (b) the aggregate amount of any Relief Act Interest Shortfall, if any allocated, in each case, to such REMIC Regular Interest pursuant to Section 1.02. In addition, Uncertificated Interest with respect to each Distribution Date, as to any REMIC Regular Interest shall be reduced by Realized Losses, if any, allocated to such REMIC Regular Interest pursuant to Section 1.02 and Section 4.04.

“Underwriters’ Exemption”: As defined in the Prospectus Supplement.

“Uninsured Cause”: Any cause of damage to a Mortgaged Property such that the complete restoration of such property is not fully reimbursable by the hazard insurance policies required to be maintained pursuant to Section 3.14.

“United States Person”: A citizen or resident of the United States, a corporation, partnership or other entity created or organized in, or under the laws of, the United States, any state thereof or, District of Columbia (except, in the case of a partnership, to the extent provided in regulations) provided that, for purposes solely of the restrictions on the transfer of Class R Certificates, no partnership or other entity treated as a partnership for United States federal income tax purposes shall be treated as a United States Person unless all persons that own an interest in such partnership either directly or through any entity that is not a corporation for United States federal income tax purposes are required by the applicable operative agreement to be United States Persons or an estate whose income is subject to United States federal income tax regardless of its source, or a trust if a court within the United States is able to exercise primary supervision over the administration of the trust and one or more United States persons have the authority to control all substantial decisions of the trust. To the extent prescribed in regulations by the Secretary of the Treasury, a trust which was in existence on August 20, 1996 (other than a trust treated as owned by the grantor under subpart E of part I of subchapter J of chapter 1 of the Code), and which was treated as a United States person on August 20, 1996 may elect to continue to be treated as a United States person notwithstanding the previous sentence. The term “United States” shall have the meaning set forth in Section 7701 of the Code.

“Unpaid Interest Shortfall Amount”: With respect to the Class A Certificates and the Mezzanine Certificates and (i) the first Distribution Date, zero, and (ii) any Distribution Date after the first Distribution Date, the amount, if any, by which (a) the sum of (1) the Monthly Interest Distributable Amount for such Class for the immediately preceding Distribution Date and (2) the outstanding Unpaid Interest Shortfall Amount, if any, for such Class for such

preceding Distribution Date exceeds (b) the aggregate amount distributed on such Class in respect of interest pursuant to clause (a) of this definition on such preceding Distribution Date, plus interest on the amount of interest due but not paid on the Certificates of such Class on such preceding Distribution Date, to the extent permitted by law, at the Pass-Through Rate for such Class for the related Accrual Period.

“Value”: With respect to any Mortgage Loan, and the related Mortgaged Property, the lesser of:

	(i)	the lesser of (a) the value thereof as determined by an appraisal made for the originator of the Mortgage Loan at the time of origination of the Mortgage Loan by an appraiser who met the minimum requirements of Fannie Mae and Freddie Mac, and (b) the value thereof as determined by a review appraisal conducted by the Originator in the event any such review appraisal determines an appraised value more than 10% lower than the value thereof, in the case of a Mortgaged Loan with a Loan-to-Value Ratio less than or equal to 80%, or more than 5% lower than the value thereof, in the case of a Mortgage Loan with a Loan-to-Value Ratio greater than 80%, as determined by the appraisal referred to in clause (i)(a) above; and

	(ii)	the purchase price paid for the related Mortgaged Property by the Mortgagor with the proceeds of the Mortgage Loan; provided, however, that in the case of a refinanced Mortgage Loan (which is a Mortgage Loan the proceeds of which were not used to purchase the related Mortgaged Property) or a Mortgage Loan originated in connection with a “lease option purchase” if the “lease option purchase price” was set 12 months or more prior to origination, such value of the Mortgaged Property is based solely upon clause (i) above.

“Voting Rights”: The portion of the voting rights of all of the Certificates which is allocated to any Certificate. With respect to any date of determination, 98% of all Voting Rights will be allocated among the holders of the Class A Certificates, the Mezzanine Certificates and the Class CE Certificates in proportion to the then outstanding Certificate Principal Balances of their respective Certificates, 1% of all Voting Rights will be allocated to the holders of the Class P Certificates and 1% of all Voting Rights will be allocated among the holders of the Residual Certificates. The Voting Rights allocated to each Class of Certificate shall be allocated among Holders of each such Class in accordance with their respective Percentage Interests as of the most recent Record Date.

Section 1.02.

Allocation of Certain Interest Shortfalls.

For purposes of calculating the amount of the Monthly Interest Distributable Amount for the Class A Certificates, the Mezzanine Certificates and the Class CE Certificates for any Distribution Date, (1) the aggregate amount of any Prepayment Interest Shortfalls (to the extent not covered by payments by the Master Servicer pursuant to Section 3.24) and any Relief Act Interest Shortfall incurred in respect of the Mortgage Loans for any Distribution Date shall be allocated first, to the Class CE Certificates based on, and to the extent of, one month’s interest

at the then applicable respective Pass-Through Rate on the respective Notional Amount of each such Certificate and, thereafter, among the Class A Certificates and the Mezzanine Certificates on a pro rata basis based on, and to the extent of, one month’s interest at the then applicable respective Pass-Through Rate on the respective Certificate Principal Balance of each such Certificate and (2) the aggregate amount of any Realized Losses and Net WAC Rate Carryover Amounts incurred for any Distribution Date shall be allocated to the Class CE Certificates based on, and to the extent of, one month’s interest at the then applicable respective Pass-Through Rate on the respective Notional Amount of each such Certificate.

For purposes of calculating the amount of Uncertificated Interest for the REMIC I Regular Interests for any Distribution Date:

	(A)	The REMIC I Marker Allocation Percentage of the aggregate amount of any Prepayment Interest Shortfalls (to the extent not covered by payments by the Master Servicer pursuant to Section 3.24) and the REMIC I Marker Allocation Percentage of the aggregate amount of any Relief Act Interest Shortfalls incurred in respect of the Mortgage Loans for any Distribution Date shall be allocated among REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10, REMIC I Regular Interest I-LTM11 and REMIC I Regular Interest I-LTZZ pro rata based on, and to the extent of, one month’s interest at the then applicable respective Pass-Through Rate on the respective Uncertificated Balance of each such REMIC I Regular Interest; and

	(B)	The REMIC I Sub WAC Allocation Percentage of the aggregate amount of any Prepayment Interest Shortfalls (to the extent not covered by payments by the Master Servicer pursuant to Section 3.24) and the REMIC I Sub WAC Allocation Percentage of the aggregate amount of any Relief Act Interest Shortfalls incurred in respect of the Mortgage Loans for any Distribution Date shall be allocated first, to Uncertificated Interest payable to REMIC I Regular Interest I-LT1SUB, REMIC I Regular Interest I-LT1GRP, REMIC I Regular Interest I-LT2SUB, REMIC I Regular Interest I-LT2GRP and REMIC I Regular Interest I-LTXX, pro rata based on, and to the extent of, one month’s interest at the then applicable respective Pass-Through Rate on the respective Uncertificated Balance of each such REMIC I Regular Interest.

Section 1.03.

Rights of the NIMS Insurer.

Each of the rights of the NIMS Insurer set forth in this Agreement shall exist so long as (i) the NIMS Insurer has undertaken to guarantee certain payments of notes issued pursuant to the Indenture and (ii) the notes issued pursuant to the Indenture remain outstanding or the NIMS Insurer is owed amounts in respect of its guarantee of payment on such notes; provided, however, the NIMS Insurer shall not have any rights hereunder (except pursuant to Section 11.01 and any rights to indemnification hereunder in the case of clause (ii) below) so long as (i) the NIMS Insurer has not undertaken to guarantee certain payments of notes issued pursuant to the Indenture or (ii) any default has occurred and is continuing under the insurance policy issued by the NIMS Insurer with respect to such notes.

ARTICLE II

CONVEYANCE OF MORTGAGE LOANS;

ORIGINAL ISSUANCE OF CERTIFICATES

Section 2.01.

Conveyance of the Mortgage Loans.

The Depositor, concurrently with the execution and delivery hereof, does hereby transfer, assign, set over and otherwise convey to the Trustee without recourse, for the benefit of the Certificateholders, all the right, title and interest of the Depositor, including any security interest therein for the benefit of the Depositor, in and to the Mortgage Loans identified on the Mortgage Loan Schedule, the rights of the Depositor under the Mortgage Loan Purchase Agreement, and all other assets included or to be included in REMIC I. Such assignment includes all interest and principal received by the Depositor or the Master Servicer on or with respect to the Mortgage Loans (other than payments of principal and interest due on such Mortgage Loans on or before the Cut-off Date). The Depositor herewith delivers to the Trustee an executed original Mortgage Loan Purchase Agreement and PMI Policies.

In connection with such transfer and assignment, the Depositor does hereby deliver to, and deposit with, the Trustee the following documents or instruments with respect to each Mortgage Loan so transferred and assigned (a “Mortgage File”):

(i) the original Mortgage Note, endorsed in blank or in the following form: “Pay to the order of Wells Fargo Bank, N.A., as Trustee under the applicable agreement, without recourse,” with all prior and intervening endorsements showing a complete chain of endorsement from the originator to the Person so endorsing to the Trustee;

(ii) the original Mortgage with evidence of recording thereon, and the original recorded power of attorney, if the Mortgage was executed pursuant to a power of attorney, with evidence of recording thereon;

(iii)

an original Assignment in blank;

(iv) the original recorded Assignment or Assignments showing a complete chain of assignment from the originator to the Person assigning the Mortgage to the Trustee as contemplated by the immediately preceding clause (iii);

(v) the original or copies of each assumption, modification, written assurance or substitution agreement, if any; and

(vi) the original lender’s title insurance policy, together with all endorsements or riders that were issued with or subsequent to the issuance of such policy, insuring the priority of the Mortgage as a first or second lien on the Mortgaged Property represented therein as a fee interest vested in the Mortgagor, or in the event such original title policy is unavailable, a written commitment or uniform binder or preliminary report of title issued by the title insurance or escrow company.

With respect to a maximum of approximately 2.00% of the Original Mortgage Loans, by outstanding principal balance of the Original Mortgage Loans as of the Cut-off Date, if any original Mortgage Note referred to in Section 2.01(i) above cannot be located, the obligations of the Depositor to deliver such documents shall be deemed to be satisfied upon delivery to the Trustee of a photocopy of such Mortgage Note, if available, with a lost note affidavit substantially in the form of Exhibit I attached hereto. If any of the original Mortgage Notes for which a lost note affidavit was delivered to the Trustee is subsequently located, such original Mortgage Note shall be delivered to the Trustee within three Business Days.

The Master Servicer, in its capacity as Originator, shall promptly (within sixty Business Days following the later of the Closing Date and the date of receipt by the Trustee of the recording information for a Mortgage, but in no event later than ninety days following the Closing Date) submit or cause to be submitted for recording, at no expense to the Trust Fund, the Trustee or the Depositor, in the appropriate public office for real property records, each Assignment referred to in Sections 2.01(iii) and (iv) above and in connection therewith, the Master Servicer shall cause each original Assignment to be executed in the following form: “Wells Fargo Bank, N.A., as Trustee under the applicable agreement.” In the event that any such Assignment is lost or returned unrecorded because of a defect therein, the Master Servicer shall promptly prepare or cause to be prepared a substitute Assignment or cure or cause to be cured such defect, as the case may be, and thereafter cause each such Assignment to be duly recorded.

Notwithstanding the foregoing, the Assignments of Mortgage shall not be required to be submitted for recording (except with respect to any Mortgage Loan located in Maryland) unless the Depositor is informed by the Rating Agencies that such failure to record would result in a withdrawal or a downgrading by any Rating Agency of the rating on any Class of Certificates; provided, however, each Assignment shall be submitted in the manner described above, at no expense to the Trust Fund or the Trustee, upon the earliest to occur of: (i) reasonable direction by the Holders of Certificates entitled to at least 25% of the Voting Rights or the NIMS Insurer, (ii) the occurrence of a Master Servicer Event of Default, (iii) the occurrence of a bankruptcy, insolvency or foreclosure relating to the Originator, (iv) the occurrence of a servicing transfer as described in Section 7.02 hereof, (v) upon receipt of notice from the Master Servicer, the occurrence of a bankruptcy, insolvency or foreclosure relating to the Mortgagor under the related Mortgage and (vi) upon receipt of notice from the Master Servicer, any Mortgage Loan that is 90 days or more delinquent. Upon the occurrence of one of the events set forth in the immediately preceding sentence, the Master Servicer, in its capacity as Originator, shall deliver such Assignments for recording as provided above, promptly and in any event within 30 days following receipt of notice by the Master Servicer.

If any of the documents referred to in Sections 2.01(ii), (iii) or (iv) above has, as of the Closing Date, been submitted for recording but either (x) has not been returned from the applicable public recording office or (y) has been lost or such public recording office has retained the original of such document, the obligations of the Depositor to deliver such documents shall be deemed to be satisfied upon (1) delivery to the Trustee of a copy of each such document certified by the Originator in the case of (x) above or the applicable public recording office in the case of (y) above to be a true and complete copy of the original that was submitted for recording and (2) if such copy is certified by the Originator, delivery to the Trustee promptly upon receipt thereof of either the original or a copy of such document certified by the applicable

public recording office to be a true and complete copy of the original. Pursuant to the Mortgage Loan Purchase Agreement, notice shall be provided to the Trustee and the Rating Agencies by the Originator if delivery pursuant to clause (2) above will be made more than 180 days after the Closing Date.

If the original lender’s title insurance policy was not delivered pursuant to Section 2.01(vi) above, the Depositor shall deliver or cause to be delivered to the Trustee, promptly after receipt thereof, the original lender’s title insurance policy. The Depositor shall deliver or cause to be delivered to the Trustee promptly upon receipt thereof any other original documents constituting a part of a Mortgage File received with respect to any Mortgage Loan, including, but not limited to, any original documents evidencing an assumption or modification of any Mortgage Loan.

All original documents relating to the Mortgage Loans that are not delivered to the Trustee are and shall be held by or on behalf of the Originator, the Seller, the Depositor or the Master Servicer, as the case may be, in trust for the benefit of the Trustee on behalf of the Certificateholders. In the event that any such original document is required pursuant to the terms of this Section 2.01 to be a part of a Mortgage File, such document shall be delivered promptly to the Trustee. Any such original document delivered to or held by the Depositor that is not required pursuant to the terms of this Section to be a part of a Mortgage File, shall be delivered promptly to the Master Servicer.

The parties hereto understand and agree that it is not intended that any Mortgage Loan be included in the Trust that is a high-cost home loan as defined by the Homeownership and Equity Protection Act of 1994 or any other applicable predatory or abusive lending laws.

The Depositor hereby directs the Trustee to execute, deliver and perform its obligations under the Cap Contracts on the Closing Date and thereafter on behalf of the Trust and the Holders of the Group I Certificates, the Group II Certificates and Mezzanine Certificates. The Seller, the Depositor, the Master Servicer and the Holders of the Group I Certificates, the Group II Certificates and Mezzanine Certificates by their acceptance of such Certificates acknowledge and agree that the Trustee shall execute, deliver and perform the Trust’s obligations under the Cap Contracts and shall do so solely in its capacity as Trustee of the Trust Fund and not in its individual capacity.

Section 2.02.

Acceptance of REMIC I by Trustee.

The Trustee acknowledges receipt, subject to the provisions of Section 2.01 and subject to any exceptions noted on the exception report described in the next paragraph below, of the documents referred to in Section 2.01 (other than such documents described in Section 2.01(v)) above and all other assets included in the definition of “REMIC I” under clauses (i), (iii), (iv) and (v) (to the extent of amounts deposited into the Distribution Account) and declares that it holds and will hold such documents and the other documents delivered to it constituting a Mortgage File, and that it holds or will hold all such assets and such other assets included in the definition of “REMIC I” in trust for the exclusive use and benefit of all present and future Certificateholders.

The Trustee agrees to execute and deliver to the Depositor and the NIMS Insurer on or prior to the Closing Date an acknowledgment of receipt of the original Mortgage Note (with any exceptions noted), substantially in the form attached as Exhibit C-3 hereto.

The Trustee agrees, for the benefit of the Certificateholders and the NIMS Insurer, to review each Mortgage File and, within 45 days of the Closing Date, to certify in substantially the form attached hereto as Exhibit C-1 that, as to each Mortgage Loan listed in the Mortgage Loan Schedule (other than any Mortgage Loan paid in full or any Mortgage Loan specifically identified in the exception report annexed thereto as not being covered by such certification), (i) all documents constituting part of such Mortgage File (other than such documents described in Section 2.01(v)) required to be delivered to it pursuant to this Agreement are in its possession, (ii) such documents have been reviewed by the Trustee and appear regular on their face and relate to such Mortgage Loan and (iii) based on the Trustee’s examination and only as to the foregoing, the information set forth in the Mortgage Loan Schedule that corresponds to items (1), (2), (3), (12), (15) and (18) of the definition of “Mortgage Loan Schedule” accurately reflects information set forth in the Mortgage File. It is herein acknowledged that, in conducting such review, the Trustee is under no duty or obligation (i) to inspect, review or examine any such documents, instruments, certificates or other papers to determine whether they are genuine, enforceable, or appropriate for the represented purpose or whether they have actually been recorded or that they are other than what they purport to be on their face or (ii) to determine whether any Mortgage File should include any of the documents specified in clause (v) of Section 2.01.

Prior to the first anniversary date of this Agreement the Trustee shall deliver to the Depositor, the NIMS Insurer and the Master Servicer a final certification in the form annexed hereto as Exhibit C-2 evidencing the completeness of the Mortgage Files, with any applicable exceptions noted thereon, and the Master Servicer shall forward a copy thereof to any Sub-Servicer.

If in the process of reviewing the Mortgage Files and making or preparing, as the case may be, the certifications referred to above, the Trustee finds any document or documents constituting a part of a Mortgage File to be missing or defective in any material respect, at the conclusion of its review the Trustee shall so notify the Depositor, the NIMS Insurer and the Master Servicer. In addition, upon the discovery by the Depositor, the NIMS Insurer, the Master Servicer or the Trustee of a breach of any of the representations and warranties made by the Originator or the Seller in the Mortgage Loan Purchase Agreement in respect of any Mortgage Loan which materially adversely affects such Mortgage Loan or the interests of the related Certificateholders in such Mortgage Loan, the party discovering such breach shall give prompt written notice to the other parties.

The Trustee shall, at the written request and expense of any Certificateholder, provide a written report to such Certificateholder of all Mortgage Files released to the Master Servicer for servicing purposes.

The Depositor and the Trustee intend that the assignment and transfer herein contemplated constitute a sale of the Mortgage Loans, the related Mortgage Notes and the related documents, conveying good title thereto free and clear of any liens and encumbrances, from the

Depositor to the Trustee in trust for the benefit of the Certificateholders and that such property not be part of the Depositor’s estate or property of the Depositor in the event of any insolvency by the Depositor. In the event that such conveyance is deemed to be, or to be made as security for, a loan, the parties intend that the Depositor shall be deemed to have granted and does hereby grant to the Trustee a first priority perfected security interest in all of the Depositor’s right, title and interest in and to the Mortgage Loans, the related Mortgage Notes and the related documents, and that this Agreement shall constitute a security agreement under applicable law.

Section 2.03.

Repurchase or Substitution of Mortgage Loans by the Originator or the Seller.

(a) Upon discovery or receipt of notice of any materially defective document in, or that a document is missing from, a Mortgage File or of the breach by the Originator or the Seller of any representation, warranty or covenant under the Mortgage Loan Purchase Agreement (including any representation, warranty or covenant regarding the Prepayment Charge Schedule) in respect of any Mortgage Loan that materially adversely affects the value of such Mortgage Loan or the interest therein of the Certificateholders, the Trustee shall promptly notify the Originator, the NIMS Insurer, the Seller and the Master Servicer of such defect, missing document or breach and request that the Originator or the Seller, as applicable, deliver such missing document or cure such defect or breach within 90 days from the date the Originator or the Seller, as applicable, was notified of such missing document, defect or breach, and if the Originator or the Seller, as applicable, does not deliver such missing document or cure such defect or breach in all material respects during such period, the Master Servicer, to the extent it is not the Originator, the Seller or an Affiliate of the Seller, and otherwise the Trustee, in accordance with Section 3.02(b), shall enforce the obligations of the Originator or the Seller, as applicable, under the Mortgage Loan Purchase Agreement to repurchase such Mortgage Loan from REMIC I at the Purchase Price within 90 days after the date on which the Originator or the Seller, as applicable, was notified (subject to Section 2.03(c)) of such missing document, defect or breach, if and to the extent that the Originator or the Seller, as applicable, is obligated to do so under the Mortgage Loan Purchase Agreement. The Purchase Price for the repurchased Mortgage Loan shall be remitted to the Master Servicer for deposit in the Collection Account and the Trustee, upon receipt of written certification from the Master Servicer of such deposit, shall release to the Originator or the Seller, as applicable, the related Mortgage File and the Trustee shall execute and deliver such instruments of transfer or assignment, in each case without recourse, as the Originator or the Seller, as applicable, shall furnish to it and as shall be necessary to vest in the Originator or the Seller, as applicable, any Mortgage Loan released pursuant hereto. The Trustee shall not have any further responsibility with regard to such Mortgage File. In lieu of repurchasing any such Mortgage Loan as provided above, if so provided in the Mortgage Loan Purchase Agreement, the Originator or the Seller, as applicable, may cause such Mortgage Loan to be removed from REMIC I (in which case it shall become a Deleted Mortgage Loan) and substitute one or more Qualified Substitute Mortgage Loans in the manner and subject to the limitations set forth in Section 2.03(b); provided, however, the Originator may not substitute a Qualified Substitute Mortgage Loan for any Deleted Mortgage Loan that violates any predatory or abusive lending law. It is understood and agreed that the obligation of the Originator or the Seller, as applicable, to cure or to repurchase (or to substitute for) any Mortgage Loan as to which a document is missing, a material defect in a constituent

document exists or as to which such a breach has occurred and is continuing shall constitute the sole remedy respecting such omission, defect or breach available to the Trustee and the Certificateholders.

(b) Any substitution of Qualified Substitute Mortgage Loans for Deleted Mortgage Loans made pursuant to Section 2.03(a) must be effected prior to the date which is two years after the Startup Day for REMIC I.

As to any Deleted Mortgage Loan for which the Originator or the Seller, as applicable, substitutes a Qualified Substitute Mortgage Loan or Loans, such substitution shall be effected by the Originator or the Seller, as applicable, delivering to the Trustee, for such Qualified Substitute Mortgage Loan or Loans, the Mortgage Note, the Mortgage, the Assignment to the Trustee, and such other documents and agreements, with all necessary endorsements thereon, as are required by Section 2.01, together with an Officers’ Certificate providing that each such Qualified Substitute Mortgage Loan satisfies the definition thereof and specifying the Substitution Adjustment Amount (as described below), if any, in connection with such substitution. The Trustee shall acknowledge receipt for such Qualified Substitute Mortgage Loan or Loans and, within ten Business Days thereafter, review such documents as specified in Section 2.02 and deliver to the Depositor, the NIMS Insurer and the Master Servicer, with respect to such Qualified Substitute Mortgage Loan or Loans, a certification substantially in the form attached hereto as Exhibit C-1, with any applicable exceptions noted thereon. Within one year of the date of substitution, the Trustee shall deliver to the Depositor, the NIMS Insurer and the Master Servicer a certification substantially in the form of Exhibit C-2 hereto with respect to such Qualified Substitute Mortgage Loan or Loans, with any applicable exceptions noted thereon. Monthly Payments due with respect to Qualified Substitute Mortgage Loans in the month of substitution are not part of REMIC I and will be retained by the Originator or the Seller, as applicable. For the month of substitution, distributions to Certificateholders will reflect the Monthly Payment due on such Deleted Mortgage Loan on or before the Due Date in the month of substitution, and the Originator or the Seller, as applicable, shall thereafter be entitled to retain all amounts subsequently received in respect of such Deleted Mortgage Loan. The Depositor shall give or cause to be given written notice to the Certificateholders and the NIMS Insurer that such substitution has taken place, shall amend the Mortgage Loan Schedule to reflect the removal of such Deleted Mortgage Loan from the terms of this Agreement and the substitution of the Qualified Substitute Mortgage Loan or Loans and shall deliver a copy of such amended Mortgage Loan Schedule to the Trustee and the NIMS Insurer. Upon such substitution, such Qualified Substitute Mortgage Loan or Loans shall constitute part of the Mortgage Pool and shall be subject in all respects to the terms of this Agreement and the Mortgage Loan Purchase Agreement, including, all applicable representations and warranties thereof included in the Mortgage Loan Purchase Agreement.

For any month in which the Originator or the Seller, as applicable, substitutes one or more Qualified Substitute Mortgage Loans for one or more Deleted Mortgage Loans, the Master Servicer will determine the amount (the “Substitution Adjustment Amount”), if any, by which the aggregate Purchase Price of all such Deleted Mortgage Loans exceeds the aggregate of, as to each such Qualified Substitute Mortgage Loan, the Principal Balance thereof as of the date of substitution, together with one month’s interest on such Principal Balance at the applicable Net Mortgage Rate, plus all outstanding Advances and Servicing Advances (including

Nonrecoverable Advances and Nonrecoverable Servicing Advances) related thereto. On the date of such substitution, the Originator or the Seller, as applicable, will deliver or cause to be delivered to the Master Servicer for deposit in the Collection Account an amount equal to the Substitution Adjustment Amount, if any, and the Trustee, upon receipt of the related Qualified Substitute Mortgage Loan or Loans and certification by the Master Servicer of such deposit, shall release to the Originator or the Seller, as applicable, the related Mortgage File or Files and the Trustee shall execute and deliver such instruments of transfer or assignment, in each case without recourse, the Originator or the Seller, as applicable, shall deliver to it and as shall be necessary to vest therein any Deleted Mortgage Loan released pursuant hereto.

In addition, the Originator or the Seller, as applicable, shall obtain at its own expense and deliver to the Trustee and the NIMS Insurer an Opinion of Counsel to the effect that such substitution will not cause (a) any federal tax to be imposed on any Trust REMIC, including without limitation, any federal tax imposed on “prohibited transactions” under Section 860F(a)(1) of the Code or on “contributions after the startup date” under Section 860G(d)(1) of the Code, or (b) any Trust REMIC to fail to qualify as a REMIC at any time that any Certificate is outstanding.

(c) Upon discovery by the Depositor, the NIMS Insurer, the Originator, the Seller, the Master Servicer or the Trustee that any Mortgage Loan does not constitute a “qualified mortgage” within the meaning of Section 860G(a)(3) of the Code, the party discovering such fact shall within two Business Days give written notice thereof to the other parties. In connection therewith, the Originator, the Seller or the Depositor shall repurchase or, subject to the limitations set forth in Section 2.03(b), substitute one or more Qualified Substitute Mortgage Loans for the affected Mortgage Loan within 90 days of the earlier of discovery or receipt of such notice with respect to such affected Mortgage Loan. Such repurchase or substitution shall be made by (i) the Originator or the Seller, as the case may be, if the affected Mortgage Loan’s status as a non-qualified mortgage is or results from a breach of any representation, warranty or covenant made by the Originator or the Seller, as the case may be, under the Mortgage Loan Purchase Agreement, or (ii) the Depositor, if the affected Mortgage Loan’s status as a non-qualified mortgage is a breach of no representation or warranty. Any such repurchase or substitution shall be made in the same manner as set forth in Section 2.03(a). The Trustee shall re-convey to the Depositor, the Originator or the Seller, as the case may be, the Mortgage Loan to be released pursuant hereto in the same manner, and on the same terms and conditions, as it would a Mortgage Loan repurchased for breach of a representation or warranty.

Section 2.04.	Reserved.
Section 2.05.	Representations, Warranties and Covenants of the Master Servicer.

The Master Servicer hereby represents, warrants and covenants to the Trustee, for the benefit of the Certificateholders and to the Depositor that as of the Closing Date or as of such date specifically provided herein:

(i) The Master Servicer is duly organized, validly existing, and in good standing under the laws of the jurisdiction of its formation and has all licenses necessary to carry on its business as now being conducted and is licensed, qualified and in good

standing in the states where the Mortgaged Property is located if the laws of such state require licensing or qualification in order to conduct business of the type conducted by the Master Servicer or to ensure the enforceability or validity of each Mortgage Loan; the Master Servicer has the power and authority to execute and deliver this Agreement and to perform in accordance herewith; the execution, delivery and performance of this Agreement (including all instruments of transfer to be delivered pursuant to this Agreement) by the Master Servicer and the consummation of the transactions contemplated hereby have been duly and validly authorized; this Agreement evidences the valid, binding and enforceable obligation of the Master Servicer, subject to applicable bankruptcy, insolvency, reorganization, moratorium or other similar laws affecting the enforcement of creditors’ rights generally; and all requisite corporate action has been taken by the Master Servicer to make this Agreement valid and binding upon the Master Servicer in accordance with its terms;

(ii) The consummation of the transactions contemplated by this Agreement are in the ordinary course of business of the Master Servicer and will not result in the breach of any term or provision of the charter or by-laws of the Master Servicer or result in the breach of any term or provision of, or conflict with or constitute a default under or result in the acceleration of any obligation under, any agreement, indenture or loan or credit agreement or other instrument to which the Master Servicer or its property is subject, or result in the violation of any law, rule, regulation, order, judgment or decree to which the Master Servicer or its property is subject;

(iii) The execution and delivery of this Agreement by the Master Servicer and the performance and compliance with its obligations and covenants hereunder do not require the consent or approval of any governmental authority or, if such consent or approval is required, it has been obtained;

(iv) This Agreement, and all documents and instruments contemplated hereby which are executed and delivered by the Master Servicer, constitute and will constitute valid, legal and binding obligations of the Master Servicer, enforceable in accordance with their respective terms, except as the enforcement thereof may be limited by applicable bankruptcy laws and general principles of equity;

(v)	[Reserved];

(vi) The Master Servicer does not believe, nor does it have any reason or cause to believe, that it cannot perform each and every covenant contained in this Agreement;

(vii) There is no action, suit, proceeding or investigation pending or, to its knowledge, threatened against the Master Servicer that, either individually or in the aggregate, (A) may result in any change in the business, operations, financial condition, properties or assets of the Master Servicer that might prohibit or materially and adversely affect the performance by such Master Servicer of its obligations under, or validity or enforceability of, this Agreement, or (B) may result in any material impairment of the right or ability of the Master Servicer to carry on its business substantially as now conducted, or (C) may result in any material liability on the part of the Master Servicer,

or (D) would draw into question the validity or enforceability of this Agreement or of any action taken or to be taken in connection with the obligations of the Master Servicer contemplated herein, or (E) would otherwise be likely to impair materially the ability of the Master Servicer to perform under the terms of this Agreement;

(viii) Neither this Agreement nor any information, certificate of an officer, statement furnished in writing or report delivered to the Trustee by the Master Servicer in connection with the transactions contemplated hereby contains any untrue statement of a material fact;

(ix) The Master Servicer covenants that its computer and other systems used in servicing the Mortgage Loans operate in a manner such that the Master Servicer can service the Mortgage Loans in accordance with the terms of this Agreement;

(x) The information set forth in the Prepayment Charge Schedule (including the Prepayment Charge Summary attached thereto) is complete, true and correct in all material respects on the date or dates when such information is furnished and each Prepayment Charge is permissible and enforceable in accordance with its terms (except to the extent that the enforceability thereof may be limited by bankruptcy, insolvency, moratorium, receivership and other similar laws affecting creditor’s rights generally or the collectibility thereof may be limited due to acceleration in connection with a foreclosure) under applicable state, federal and local law;

(xi) The Master Servicer will not waive any Prepayment Charge unless it is waived in accordance with the standard set forth in Section 3.01; and

(xii) The Master Servicer has accurately and fully reported, and will continue to accurately and fully report, its borrower credit files to each of the credit repositories in a timely manner.

It is understood and agreed that the representations, warranties and covenants set forth in this Section 2.05 shall survive delivery of the Mortgage Files to the Trustee and shall inure to the benefit of the Trustee, the Depositor and the Certificateholders. Upon discovery by any of the Depositor, the Master Servicer, the NIMS Insurer or the Trustee of a breach of any of the foregoing representations, warranties and covenants which materially and adversely affects the value of any Mortgage Loan or the interests therein of the Certificateholders, the party discovering such breach shall give prompt written notice (but in no event later than two Business Days following such discovery) to the NIMS Insurer and the Trustee. Subject to Section 7.01, unless such breach shall not be susceptible of cure within 90 days, the obligation of the Master Servicer set forth in this Section 2.05 to cure breaches shall constitute the sole remedy against the Master Servicer available to the Certificateholders, the Depositor and the Trustee on behalf of the Certificateholders respecting a breach of the representations, warranties and covenants contained in this Section 2.05. Notwithstanding the foregoing, within 90 days of the earlier of discovery by the Master Servicer or receipt of notice by the Master Servicer of the breach of the representation or covenant of the Master Servicer (in its capacity as Originator) set forth in Sections 2.05(x) or 2.05(xi) above which materially and adversely affects the interests of the Holders of the Class P Certificates in any Prepayment Charge, the Master Servicer shall remedy

such breach as follows: (a) if the representation made by the Master Servicer (in its capacity as Originator) in Section 2.05(x) above is breached and a Principal Prepayment has occurred in the applicable Prepayment Period or if a change of law subsequent to the Closing Date limits the enforceability of a Prepayment Charge (other than in the circumstances provided in Section 2.05(x) above), the Master Servicer (in its capacity as Originator) must pay the amount of the scheduled Prepayment Charge, for the benefit of the Holders of the Class P Certificates, by depositing such amount into the Collection Account, net of any amount previously collected by the Master Servicer and paid by the Master Servicer, for the benefit of the Holders of the Class P Certificates, in respect of such Prepayment Charge; and (b) if any of the covenants made by the Master Servicer in Section 2.05(xi) above is breached, the Master Servicer must pay the amount of such waived Prepayment Charge, for the benefit of the Holders of the Class P Certificates, by depositing such amount into the Collection Account.

Section 2.06.

Issuance of the REMIC I Regular Interests and the Class R-I Interest.

The Trustee acknowledges the assignment to it of the Mortgage Loans and the delivery to it of the Mortgage Files, subject to the provisions of Section 2.01 and Section 2.02, together with the assignment to it of all other assets included in REMIC I, the receipt of which is hereby acknowledged. Concurrently with such assignment and delivery and in exchange therefor, the Trustee, pursuant to the written request of the Depositor executed by an officer of the Depositor, has executed, authenticated and delivered to or upon the order of the Depositor, the Class R-I Interest in authorized denominations. The interests evidenced by the Class R-I Interest, together with the REMIC I Regular Interests, constitute the entire beneficial ownership interest in REMIC I. The rights of the Class R-I Interest and REMIC II (as holder of the REMIC I Regular Interests) to receive distributions from the proceeds of REMIC I in respect of the Class R-I Interest and the REMIC I Regular Interests, respectively, and all ownership interests evidenced or constituted by the Class R-I Interest and the REMIC I Regular Interests, shall be as set forth in this Agreement.

Section 2.07.

Conveyance of REMIC Regular Interests and Acceptance of REMIC I, REMIC II, REMIC III and REMIC IV by the Trustee.

(a) The Depositor, concurrently with the execution and delivery hereof, does hereby transfer, assign, set over and otherwise convey in trust to the Trustee without recourse all the right, title and interest of the Depositor in and to the assets described in the definition of REMIC I for the benefit of the holders of the REMIC I Regular Interests (which are uncertificated) and the Class R Certificates (in respect of the Class R-I Interest). The Trustee acknowledges receipt of the assets described in the definition of REMIC I and declares that it holds and will hold the same in trust for the exclusive use and benefit of the holders of the REMIC 1 Regular Interests and the Class R Certificates (in respect of the Class R-1 Interest). The interests evidenced by the Class R-1 Interest, together with the REMIC 1 Regular Interests, constitute the entire beneficial ownership interest in REMIC 1.

(b) The Depositor, concurrently with the execution and delivery hereof, does hereby transfer, assign, set over and otherwise convey in trust to the Trustee without recourse all the right, title and interest of the Depositor in and to the REMIC I Regular Interests (which are

uncertificated) for the benefit of the Holders of the Regular Certificates and the Class R Certificates (in respect of the Class R-II Interest). The Trustee acknowledges receipt of the REMIC I Regular Interests and declares that it holds and will hold the same in trust for the exclusive use and benefit of the Holders of the Regular Certificates. The interests evidenced by the Class R-II Interest, together with the Regular Certificates (other than the Class CE Certificates and the Class P Certificates), the Class CE Interest and the Class P Interest, constitute the entire beneficial ownership interest in REMIC II.

(c) The Depositor, concurrently with the execution and delivery hereof, does hereby transfer, assign, set over and otherwise convey in trust to the Trustee without recourse all the right, title and interest of the Depositor in and to the Class CE Interest (which is uncertificated) for the benefit of the Holders of the Class CE Certificates and the Class R-X Certificates (in respect of the Class R-III Interest). The Trustee acknowledges receipt of the Class CE Interest and declares that it holds and will hold the same in trust for the exclusive use and benefit of the Holders of the Class CE Certificates and the Class R-X Certificates (in respect of the Class R-III Interest). The interests evidenced by the Class R-III Interest, together with the Class CE Certificates, constitute the entire beneficial ownership interest in REMIC III.

(d) The Depositor, concurrently with the execution and delivery hereof, does hereby transfer, assign, set over and otherwise convey in trust to the Trustee without recourse all the right, title and interest of the Depositor in and to the Class P Interest (which is uncertificated) for the benefit of the Holders of the Class P Certificates and the Class R-X Certificates (in respect of the Class R-IV Interest). The Trustee acknowledges receipt of the Class P Interest and declares that it holds and will hold the same in trust for the exclusive use and benefit of the Holders of the Class P Certificates and the Class R-X Certificates (in respect of the Class R-IV Interest). The interests evidenced by the Class R-IV Interest, together with the Class P Certificates, constitute the entire beneficial ownership interest in REMIC IV.

Section 2.08.

Issuance of Class R Certificates and the Class R-X Certificates.

(a) The Trustee acknowledges the assignment to it of the REMIC I Regular Interests and, concurrently therewith and in exchange therefor, pursuant to the written request of the Depositor executed by an officer of the Depositor, the Trustee has executed, authenticated and delivered to or upon the order of the Depositor, the Class R Certificates in authorized denominations. The interests evidenced by the Class R Certificates, together with the REMIC II Certificates, constitute the entire beneficial ownership interest in REMIC II.

(b) The Trustee acknowledges the assignment to it of the Class CE Interest and the Class P Interest and, concurrently therewith and in exchange therefor, pursuant to the written request of the Depositor executed by an officer of the Depositor, the Trustee has executed, authenticated and delivered to or upon the order of the Depositor, the Class R-X Certificates in authorized denominations. The interests evidenced by the Class R-X Certificates, together with the Class CE Certificates and the Class P Certificates constitute the entire beneficial ownership interest in REMIC III and REMIC IV.

ARTICLE III

ADMINISTRATION AND SERVICING

OF THE MORTGAGE LOANS

Section 3.01.

Master Servicer to Act as Master Servicer.

The Master Servicer shall service and administer the Mortgage Loans on behalf of the Trust Fund and in the best interests of and for the benefit of all Certificateholders (as determined by the Master Servicer in its reasonable judgment) in accordance with the terms of this Agreement and the Mortgage Loans and, to the extent consistent with such terms, in the same manner in which it services and administers similar mortgage loans for its own portfolio, giving due consideration to customary and usual standards of practice of mortgage lenders and loan servicers administering similar mortgage loans but without regard to:

(A) any relationship that the Master Servicer, any Sub-Servicer or any Affiliate of the Master Servicer or any Sub-Servicer may have with the related Mortgagor;

(B) the ownership or non-ownership of any Certificate by the Master Servicer or any Affiliate of the Master Servicer;

(D) the Master Servicer’s or any Sub-Servicer’s right to receive compensation for its services hereunder or with respect to any particular transaction.

To the extent consistent with the foregoing, the Master Servicer (a) shall seek the timely and complete recovery of principal and interest on the Mortgage Notes and (b) shall waive (or permit a Sub-Servicer to waive) a Prepayment Charge only under the following circumstances: (i) such waiver is standard and customary in servicing similar Mortgage Loans, relates to a default or a reasonably foreseeable default and would, in the reasonable judgment of the Master Servicer, maximize recovery of total proceeds taking into account the value of such Prepayment Charge and the related Mortgage Loan or (ii) such Prepayment Charge is unenforceable in accordance with applicable law or the collection of such related Prepayment Charge would otherwise violate applicable law. If a Prepayment Charge is waived as permitted by meeting the standards described in clause (ii) above, then the Master Servicer is required to pay the amount of such waived Prepayment Charge, for the benefit of the Holders of the P Certificates, by depositing such amount into the Collection Account together with and at the time the amounts prepaid on the related Mortgage Loan is required to be deposited into the Collection Account. Subject only to the above-described servicing standards and the terms of this Agreement and of the Mortgage Loans, the Master Servicer shall have full power and authority, acting alone or through Sub-Servicers as provided in Section 3.02, to do or cause to be done any and all things in connection with such servicing and administration which it may deem necessary or desirable. Without limiting the generality of the foregoing, the Master Servicer in its own name or in the name of a Sub-Servicer is hereby authorized and empowered by the Trustee when

the Master Servicer believes it appropriate in its best judgment in accordance with the servicing standards set forth above, to execute and deliver, on behalf of the Certificateholders and the Trustee, and upon notice to the Trustee, any and all instruments of satisfaction or cancellation, or of partial or full release or discharge, and all other comparable instruments, with respect to the Mortgage Loans and the Mortgaged Properties and to institute foreclosure proceedings or obtain a deed-in-lieu of foreclosure so as to convert the ownership of such properties, and to hold or cause to be held title to such properties, on behalf of the Trustee and Certificateholders. The Master Servicer shall service and administer the Mortgage Loans in accordance with applicable state and federal law and shall provide to the Mortgagors any reports required to be provided to them thereby. The Master Servicer shall also comply in the performance of this Agreement with all reasonable rules and requirements of each insurer under any standard hazard insurance policy. Subject to Section 3.17, within 15 days of the Closing Date, the Trustee shall execute, at the written request of the Master Servicer, and furnish to the Master Servicer and any Sub-Servicer any special or limited powers of attorney for each county in which a Mortgaged Property is located and other documents necessary or appropriate to enable the Master Servicer or any Sub-Servicer to carry out their servicing and administrative duties hereunder; provided, such limited powers of attorney or other documents shall be prepared by the Master Servicer and submitted to the Trustee for execution. The Trustee shall not be liable for the actions of the Master Servicer or any Sub-Servicers under such powers of attorney.

Subject to Section 3.09 hereof, in accordance with the standards of the preceding paragraph, the Master Servicer shall advance or cause to be advanced funds as necessary for the purpose of effecting the timely payment of taxes and assessments on the Mortgaged Properties, which advances shall be Servicing Advances reimbursable in the first instance from related collections from the Mortgagors pursuant to Section 3.09, and further as provided in Section 3.11. Any cost incurred by the Master Servicer or by Sub-Servicers in effecting the timely payment of taxes and assessments on a Mortgaged Property shall not, for the purpose of calculating distributions to Certificateholders, be added to the unpaid Principal Balance of the related Mortgage Loan, notwithstanding that the terms of such Mortgage Loan so permit.

Notwithstanding anything in this Agreement to the contrary, the Master Servicer may not make any future advances with respect to a Mortgage Loan (except as provided in Section 4.03) and the Master Servicer shall not (i) permit any modification with respect to any Mortgage Loan that would change the Mortgage Rate, reduce or increase the Principal Balance (except for reductions resulting from actual payments of principal) or change the final maturity date on such Mortgage Loan (unless, as provided in Section 3.07, the Mortgagor is in default with respect to the Mortgage Loan or such default is, in the judgment of the Master Servicer, reasonably foreseeable) or (ii) permit any modification, waiver or amendment of any term of any Mortgage Loan that would both (A) effect an exchange or reissuance of such Mortgage Loan under Section 1001 of the Code (or Treasury regulations promulgated thereunder) and (B) cause any REMIC created hereunder to fail to qualify as a REMIC under the Code or the imposition of any tax on “prohibited transactions” or “contributions after the startup date” under the REMIC Provisions.

Section 3.02.

Sub-Servicing Agreements Between Master Servicer and Sub-Servicers.

(a) The Master Servicer may enter into Sub-Servicing Agreements with Sub-Servicers for the servicing and administration of the Mortgage Loans; provided, however, that (i) such agreements would not result in a withdrawal or a downgrading by any Rating Agency of the rating on any Class of Certificates and (ii) the NIMS Insurer shall have consented to such Sub-Servicing Agreement. The Trustee is hereby authorized to acknowledge, at the request of the Master Servicer, any Sub-Servicing Agreement that meets the requirements applicable to Sub-Servicing Agreements set forth in this Agreement and that is otherwise permitted under this Agreement.

Each Sub-Servicer shall be (i) authorized to transact business in the state or states where the related Mortgaged Properties it is to service are situated, if and to the extent required by applicable law to enable the Sub-Servicer to perform its obligations hereunder and under the Sub-Servicing Agreement and (ii) a Freddie Mac or Fannie Mae approved mortgage servicer. Each Sub-Servicing Agreement must impose on the Sub-Servicer requirements conforming to the provisions set forth in Section 3.08 and provide for servicing of the Mortgage Loans consistent with the terms of this Agreement. The Master Servicer will examine each Sub-Servicing Agreement and will be familiar with the terms thereof. The terms of any Sub-Servicing Agreement will not be inconsistent with any of the provisions of this Agreement. The Master Servicer and the Sub-Servicers may enter into and make amendments to the Sub-Servicing Agreements or enter into different forms of Sub-Servicing Agreements; provided, however, that any such amendments or different forms shall be consistent with and not violate the provisions of this Agreement, and that no such amendment or different form shall be made or entered into which could be reasonably expected to be materially adverse to the interests of the Certificateholders without the consent of the Holders of Certificates entitled to at least 66% of the Voting Rights; provided, further, that the consent of the Holders of Certificates entitled to at least 66% of the Voting Rights shall not be required (i) to cure any ambiguity or defect in a Sub-Servicing Agreement, (ii) to correct, modify or supplement any provisions of a Sub-Servicing Agreement, or (iii) to make any other provisions with respect to matters or questions arising under a Sub-Servicing Agreement, which, in each case, shall not be inconsistent with the provisions of this Agreement. Any variation without the consent of the Holders of Certificates entitled to at least 66% of the Voting Rights from the provisions set forth in Section 3.08 relating to insurance or priority requirements of Sub-Servicing Accounts, or credits and charges to the Sub-Servicing Accounts or the timing and amount of remittances by the Sub-Servicers to the Master Servicer, are conclusively deemed to be inconsistent with this Agreement and therefore prohibited. The Master Servicer shall deliver to the NIMS Insurer and the Trustee copies of all Sub-Servicing Agreements, and any amendments or modifications thereof, promptly upon the Master Servicer’s execution and delivery of such instruments.

(b) As part of its servicing activities hereunder, the Master Servicer, for the benefit of the Trustee and the Certificateholders, shall enforce the obligations of each Sub-Servicer under the related Sub-Servicing Agreement and of the Originator and the Seller under the Mortgage Loan Purchase Agreement, including, without limitation, any obligation to make advances in respect of delinquent payments as required by a Sub-Servicing Agreement, or to purchase a Mortgage Loan on account of missing or defective documentation or on account of a

breach of a representation, warranty or covenant, as described in Section 2.03(a). Such enforcement, including, without limitation, the legal prosecution of claims, termination of Sub-Servicing Agreements, and the pursuit of other appropriate remedies, shall be in such form and carried out to such an extent and at such time as the Master Servicer, in its good faith business judgment, would require were it the owner of the related Mortgage Loans. The Master Servicer shall pay the costs of such enforcement at its own expense, and shall be reimbursed therefor only (i) from a general recovery resulting from such enforcement, to the extent, if any, that such recovery exceeds all amounts due in respect of the related Mortgage Loans, or (ii) from a specific recovery of costs, expenses or attorneys’ fees against the party against whom such enforcement is directed. Enforcement of the Mortgage Loan Purchase Agreement against the Originator or the Seller shall be effected by the Master Servicer to the extent it is not the Originator, and otherwise by the Trustee in accordance with the foregoing provisions of this paragraph.

Section 3.03.

Successor Sub-Servicers.

The Master Servicer, with the consent of the NIMS Insurer, shall be entitled to terminate any Sub-Servicing Agreement and the rights and obligations of any Sub-Servicer pursuant to any Sub-Servicing Agreement in accordance with the terms and conditions of such Sub-Servicing Agreement. In the event of termination of any Sub-Servicer, all servicing obligations of such Sub-Servicer shall be assumed simultaneously by the Master Servicer without any act or deed on the part of such Sub-Servicer or the Master Servicer, and the Master Servicer either shall service directly the related Mortgage Loans or shall enter into a Sub-Servicing Agreement with a successor Sub-Servicer which qualifies under Section 3.02.

Any Sub-Servicing Agreement shall include the provision that such agreement may be immediately terminated by the Trustee (if the Trustee is acting as Master Servicer) without fee, in accordance with the terms of this Agreement, in the event that the Master Servicer (or the Trustee, if such party is then acting as Master Servicer) shall, for any reason, no longer be the Master Servicer (including termination due to a Master Servicer Event of Termination).

Section 3.04.

Liability of the Master Servicer.

Notwithstanding any Sub-Servicing Agreement or the provisions of this Agreement relating to agreements or arrangements between the Master Servicer and a Sub-Servicer or reference to actions taken through a Sub-Servicer or otherwise, the Master Servicer shall remain obligated and primarily liable to the Trustee and the Certificateholders for the servicing and administering of the Mortgage Loans in accordance with the provisions of Section 3.01 without diminution of such obligation or liability by virtue of such Sub-Servicing Agreements or arrangements or by virtue of indemnification from the Sub-Servicer and to the same extent and under the same terms and conditions as if the Master Servicer alone were servicing and administering the Mortgage Loans. The Master Servicer shall be entitled to enter into any agreement with a Sub-Servicer for indemnification of the Master Servicer by such Sub-Servicer and nothing contained in this Agreement shall be deemed to limit or modify such indemnification.

Section 3.05.

No Contractual Relationship Between Sub-Servicers and the NIMS Insurer, the Trustee or Certificateholders.

Any Sub-Servicing Agreement that may be entered into and any transactions or services relating to the Mortgage Loans involving a Sub-Servicer in its capacity as such shall be deemed to be between the Sub-Servicer and the Master Servicer alone, and the NIMS Insurer, the Trustee or Certificateholders shall not be deemed parties thereto and shall have no claims, rights, obligations, duties or liabilities with respect to the Sub-Servicer except as set forth in Section 3.06. The Master Servicer shall be solely liable for all fees owed by it to any Sub-Servicer, irrespective of whether the Master Servicer’s compensation pursuant to this Agreement is sufficient to pay such fees.

Section 3.06.

Assumption or Termination of Sub-Servicing Agreements by Trustee.

In the event the Master Servicer shall for any reason no longer be the servicer (including by reason of the occurrence of a Master Servicer Event of Termination), the Trustee shall thereupon assume all of the rights and obligations of the Master Servicer under each Sub-Servicing Agreement that the Master Servicer may have entered into, unless the Trustee elects to terminate any Sub-Servicing Agreement in accordance with its terms as provided in Section 3.03. Upon such assumption, the Trustee (or the successor servicer appointed pursuant to Section 7.02) shall be deemed, subject to Section 3.03, to have assumed all of the departing Master Servicer’s interest therein and to have replaced the departing Master Servicer as a party to each Sub-Servicing Agreement to the same extent as if each Sub-Servicing Agreement had been assigned to the assuming party, except that (i) the departing Master Servicer shall not thereby be relieved of any liability or obligations under any Sub-Servicing Agreement that arose before it ceased to be the Master Servicer and (ii) neither the Trustee nor any successor Master Servicer shall be deemed to have assumed any liability or obligation of the Master Servicer that arose before it ceased to be the Master Servicer.

The Master Servicer at its expense shall, upon request of the Trustee, deliver to the assuming party all documents and records relating to each Sub-Servicing Agreement and the Mortgage Loans then being serviced and an accounting of amounts collected and held by or on behalf of it, and otherwise use its best efforts to effect the orderly and efficient transfer of the Sub-Servicing Agreements to the assuming party. All Servicing Transfer Costs shall be paid by the predecessor Master Servicer upon presentation of reasonable documentation of such costs, and if such predecessor Master Servicer defaults in its obligation to pay such costs, such costs shall be paid by the successor Master Servicer or the Trustee (in which case the successor Master Servicer or the Trustee, as applicable, shall be entitled to reimbursement therefor from the assets of the Trust Fund).

Section 3.07.

Collection of Certain Mortgage Loan Payments.

The Master Servicer shall make reasonable efforts to collect all payments called for under the terms and provisions of the Mortgage Loans, and shall, to the extent such procedures shall be consistent with this Agreement and the terms and provisions of any applicable insurance policies, follow such collection procedures as it would follow with respect

to mortgage loans comparable to the Mortgage Loans and held for its own account. Consistent with the foregoing, the Master Servicer may in its discretion (i) waive any late payment charge or, if applicable, any penalty interest, or (ii) extend the due dates for the Monthly Payments due on a Mortgage Note for a period of not greater than 180 days; provided, however, that any extension pursuant to clause (ii) above shall not affect the amortization schedule of any Mortgage Loan for purposes of any computation hereunder, except as provided below; provided further that the NIMS Insurer’s prior written consent shall be required for any modification, waiver or amendment if in the aggregate the number of outstanding Mortgage Loans which have been modified, waived or amended exceeds 5% of the number of Mortgage Loans as of the Cut-off Date. In the event of any such arrangement pursuant to clause (ii) above, the Master Servicer shall make Advances on such Mortgage Loan during such extension pursuant to Section 4.03 and in accordance with the amortization schedule of such Mortgage Loan without modification thereof by reason of such arrangement. Notwithstanding the foregoing, in the event that any Mortgage Loan is in default or, in the judgment of the Master Servicer, such default is reasonably foreseeable, the Master Servicer, consistent with the standards set forth in Section 3.01, may also waive, modify or vary any term of such Mortgage Loan (including modifications that would change the Mortgage Rate, forgive the payment of principal or interest, capitalize past due Monthly Payments and outstanding Servicing Advances or extend the final maturity date of such Mortgage Loan), accept payment from the related Mortgagor of an amount less than the Stated Principal Balance in final satisfaction of such Mortgage Loan, or consent to the postponement of strict compliance with any such term or otherwise grant indulgence to any Mortgagor (any and all such waivers, modifications, variances, forgiveness of principal or interest, postponements, or indulgences collectively referred to herein as “forbearance”), provided, however, that in no event shall the Master Servicer grant any such forbearance (other than as permitted by the second sentence of this Section) with respect to any one Mortgage Loan more than once in any 12 month period or more than three times over the life of such Mortgage Loan. The Master Servicer’s analysis supporting any forbearance and the conclusion that any forbearance meets the standards of Section 3.01 shall be reflected in writing in the Mortgage File.

Section 3.08.

Sub-Servicing Accounts.

In those cases where a Sub-Servicer is servicing a Mortgage Loan pursuant to a Sub-Servicing Agreement, the Sub-Servicer will be required to establish and maintain one or more accounts (collectively, the “Sub-Servicing Account”). The Sub-Servicing Account shall be an Eligible Account and shall comply with all requirements of this Agreement relating to the Collection Account. The Sub-Servicer shall deposit in the clearing account in which it customarily deposits payments and collections on mortgage loans in connection with its mortgage loan servicing activities on a daily basis, and in no event more than one Business Day after the Sub-Servicer’s receipt thereof, all proceeds of Mortgage Loans received by the Sub-Servicer less its servicing compensation to the extent permitted by the Sub-Servicing Agreement, and shall thereafter deposit such amounts in the Sub-Servicing Account, in no event more than two Business Days after the receipt of such amounts. The Sub-Servicer shall thereafter deposit such proceeds in the Collection Account or remit such proceeds to the Master Servicer for deposit in the Collection Account not later than two Business Days after the deposit of such amounts in the Sub-Servicing Account. For purposes of this Agreement, the Master Servicer

shall be deemed to have received payments on the Mortgage Loans when the Sub-Servicer receives such payments.

Section 3.09.

Collection of Taxes, Assessments and Similar Items; Servicing Accounts.

The Master Servicer shall establish and maintain, or cause to be established and maintained, one or more accounts (the “Servicing Accounts”), into which all Escrow Payments shall be deposited and retained. Servicing Accounts shall be Eligible Accounts. The Master Servicer shall deposit in the clearing account in which it customarily deposits payments and collections on mortgage loans in connection with its mortgage loan servicing activities on a daily basis, and in no event more than one Business Day after the Master Servicer’s receipt thereof, all Escrow Payments collected on account of the Mortgage Loans and shall thereafter deposit such Escrow Payments in the Servicing Accounts, in no event more than two Business Days after the receipt of such Escrow Payments, all Escrow Payments collected on account of the Mortgage Loans for the purpose of effecting the timely payment of any such items as required under the terms of this Agreement. Withdrawals of amounts from a Servicing Account may be made only to (i) effect payment of taxes, assessments, hazard insurance premiums, and comparable items in a manner and at a time that assures that the lien priority of the Mortgage is not jeopardized (or, with respect to the payment of taxes, in a manner and at a time that avoids the loss of the Mortgaged Property due to a tax sale or the foreclosure as a result of a tax lien); (ii) reimburse the Master Servicer (or a Sub-Servicer to the extent provided in the related Sub-Servicing Agreement) out of related collections for any Servicing Advances made pursuant to Section 3.01 (with respect to taxes and assessments) and Section 3.14 (with respect to hazard insurance); (iii) refund to Mortgagors any sums as may be determined to be overages; (iv) pay interest, if required and as described below, to Mortgagors on balances in the Servicing Account; or (v) clear and terminate the Servicing Account at the termination of the Master Servicer’s obligations and responsibilities in respect of the Mortgage Loans under this Agreement in accordance with Article IX. In the event the Master Servicer shall deposit in a Servicing Account any amount not required to be deposited therein, it may at any time withdraw such amount from such Servicing Account, any provision herein to the contrary notwithstanding. The Master Servicer will be responsible for the administration of the Servicing Accounts and will be obligated to make Servicing Advances to such accounts when and as necessary to avoid the lapse of insurance coverage on the Mortgaged Property, or which the Master Servicer knows, or in the exercise of the required standard of care of the Master Servicer hereunder should know, is necessary to avoid the loss of the Mortgaged Property due to a tax sale or the foreclosure as a result of a tax lien. If any such payment has not been made and the Master Servicer receives notice of a tax lien that jeopardizes the lien of the Mortgage Loan, the Master Servicer will, within 10 business days of such notice, advance or cause to be advanced funds necessary to discharge such lien on the Mortgaged Property. As part of its servicing duties, the Master Servicer or Sub-Servicers shall pay to the Mortgagors interest on funds in the Servicing Accounts, to the extent required by law and, to the extent that interest earned on funds in the Servicing Accounts is insufficient, to pay such interest from its or their own funds, without any reimbursement therefor. The Master Servicer may pay to itself any excess interest on funds in the Servicing Accounts, to the extent such action is in conformity with the Servicing Standard, is permitted by law and such amounts are not required to be paid to Mortgagors or used for any of the other purposes set forth above.

Section 3.10.

Collection Account and Distribution Account.

(a) On behalf of the Trust Fund, the Master Servicer shall establish and maintain, or cause to be established and maintained, one or more accounts (such account or accounts, the “Collection Account”), held in trust for the benefit of the Trustee and the Certificateholders. On behalf of the Trust Fund, the Master Servicer shall deposit or cause to be deposited in the clearing account in which it customarily deposits payments and collections on mortgage loans in connection with its mortgage loan servicing activities on a daily basis, and in no event more than one Business Day after the Master Servicer’s receipt thereof, and shall thereafter deposit in the Collection Account, in no event more than two Business Days after the Master Servicer’s receipt thereof, as and when received or as otherwise required hereunder, the following payments and collections received or made by it subsequent to the Cut-off Date (other than in respect of principal or interest on the Mortgage Loans due on or before the Cut-off Date) or payments (other than Principal Prepayments) received by it on or prior to the Cut-off Date, but allocable to a Due Period subsequent thereto:

(i) all payments on account of principal, including Principal Prepayments (but not Prepayment Charges), on the Mortgage Loans;

(ii) all payments on account of interest (net of the related Servicing Fee) on each Mortgage Loan;

(iii) all Insurance Proceeds, Liquidation Proceeds, Subsequent Recoveries and condemnation proceeds (other than proceeds collected in respect of any particular REO Property and amounts paid in connection with a purchase of Mortgage Loans and REO Properties pursuant to Section 9.01);

(iv) any amounts required to be deposited pursuant to Section 3.12 in connection with any losses realized on Permitted Investments with respect to funds held in the Collection Account;

(v) any amounts required to be deposited by the Master Servicer pursuant to the second paragraph of Section 3.14(a) in respect of any blanket policy deductibles;

(vi) all proceeds of any Mortgage Loan repurchased or purchased in accordance with Section 2.03 or Section 9.01;

(vii) all amounts required to be deposited in connection with Substitution Adjustments pursuant to Section 2.03;

(viii) all Prepayment Charges collected by the Master Servicer and any Master Servicer Prepayment Charge Payment Amounts in connection with the Principal Prepayment of any of the Mortgage Loans; and

(ix)	without duplication, all payments of claims under each PMI Policy.

The foregoing requirements for deposit in the Collection Account shall be exclusive, it being understood and agreed that, without limiting the generality of the foregoing,

payments in the nature of Servicing Fees, late payment charges, assumption fees, insufficient funds charges and ancillary income (other than Prepayment Charges) need not be deposited by the Master Servicer in the Collection Account and may be retained by the Master Servicer as additional compensation. In the event the Master Servicer shall deposit in the Collection Account any amount not required to be deposited therein, it may at any time withdraw such amount from the Collection Account, any provision herein to the contrary notwithstanding.

(b) On behalf of the Trust Fund, the Trustee shall establish and maintain one or more accounts (such account or accounts, the “Distribution Account”), held in trust for the benefit of the Trustee and the Certificateholders. On behalf of the Trust Fund, the Master Servicer shall deliver to the Trustee in immediately available funds for deposit in the Distribution Account on or before 1:00 p.m. New York time (i) on the Master Servicer Remittance Date, that portion of the Available Funds (calculated without regard to the references in the definition thereof to amounts that may be withdrawn from the Distribution Account) for the related Distribution Date then on deposit in the Collection Account, the amount of all Prepayment Charges collected during the applicable Prepayment Period by the Master Servicer and Master Servicer Prepayment Charge Payment Amounts in connection with the Principal Prepayment of any of the Mortgage Loans then on deposit in the Collection Account and the amount of any funds reimbursable to an Advancing Person pursuant to Section 3.29, and (ii) on each Business Day as of the commencement of which the balance on deposit in the Collection Account exceeds $75,000 following any withdrawals pursuant to the next succeeding sentence, the amount of such excess, but only if the Collection Account constitutes an Eligible Account solely pursuant to clause (ii) of the definition of “Eligible Account.” If the balance on deposit in the Collection Account exceeds $75,000 as of the commencement of business on any Business Day and the Collection Account constitutes an Eligible Account solely pursuant to clause (ii) of the definition of “Eligible Account,” the Master Servicer shall, on or before 1:00 p.m. New York time on such Business Day, withdraw from the Collection Account any and all amounts payable or reimbursable to the Master Servicer, the Trustee, the Originator or any Sub-Servicer pursuant to Section 3.11 and shall pay such amounts to the Persons entitled thereto.

(c) Funds in the Collection Account and the Distribution Account may be invested in Permitted Investments in accordance with the provisions set forth in Section 3.12. The Master Servicer shall give notice to the NIMS Insurer and the Trustee of the location of the Collection Account maintained by it when established and prior to any change thereof. The Trustee shall give notice to the NIMS Insurer, the Master Servicer and the Depositor of the location of the Distribution Account when established and prior to any change thereof.

(d) Funds held in the Collection Account at any time may be delivered by the Master Servicer to the Trustee for deposit in an account (which may be the Distribution Account and must satisfy the standards for the Distribution Account as set forth in the definition thereof) and for all purposes of this Agreement shall be deemed to be a part of the Collection Account; provided, however, that the Trustee shall have the sole authority to withdraw any funds held pursuant to this subsection (d). In the event the Master Servicer shall deliver to the Trustee for deposit in the Distribution Account any amount not required to be deposited therein, it may at any time request that the Trustee withdraw such amount from the Distribution Account and remit to it any such amount, any provision herein to the contrary notwithstanding. In addition, the Master Servicer, with respect to items (i) through (iv) below, shall deliver to the Trustee from

time to time for deposit, and the Trustee, with respect to items (i) through (iv) below, shall so deposit, in the Distribution Account:

(i)	any Advances, as required pursuant to Section 4.03;

(ii) any amounts required to be deposited pursuant to Section 3.23(d) or (f) in connection with any REO Property;

(iii) any amounts to be paid in connection with a purchase of Mortgage Loans and REO Properties pursuant to Section 9.01;

(iv) any Compensating Interest to be deposited pursuant to Section 3.24 in connection with any Prepayment Interest Shortfall; and

(v) any amounts required to be paid to the Trustee pursuant to the Agreement, including, but not limited to Section 3.06 and Section 7.02.

(e) The Master Servicer shall deposit in the Collection Account any amounts required to be deposited pursuant to Section 3.12(b) in connection with losses realized on Permitted Investments with respect to funds held in the Collection Account.

Section 3.11.

Withdrawals from the Collection Account and Distribution Account.

(a) The Master Servicer shall, from time to time, make withdrawals from the Collection Account for any of the following purposes or as described in Section 4.03:

(i) to remit to the Trustee for deposit in the Distribution Account the amounts required to be so remitted pursuant to Section 3.10(b) or permitted to be so remitted pursuant to the first sentence of Section 3.10(d);

(ii) subject to Section 3.16(d), to reimburse the Master Servicer for (a) any unreimbursed Advances to the extent of amounts received which represent Late Collections (net of the related Servicing Fees) of Monthly Payments, Liquidation Proceeds and Insurance Proceeds on Mortgage Loans with respect to which such Advances were made in accordance with the provisions of Section 4.03; or (b) any unreimbursed Advances with respect to the final liquidation of a Mortgage Loan that are Nonrecoverable Advances, but only to the extent that Late Collections, Liquidation Proceeds and Insurance Proceeds received with respect to such Mortgage Loan are insufficient to reimburse the Master Servicer for such unreimbursed Advances;

(iii) subject to Section 3.16(d), to pay the Master Servicer, any special servicer or any sub-servicer (a) any unpaid Servicing Fees, (b) any unreimbursed Servicing Advances with respect to each Mortgage Loan, but only to the extent of any Late Collections, Liquidation Proceeds, Insurance Proceeds and condemnation proceeds received with respect to such Mortgage Loan, and (c) any Servicing Advances with respect to the final liquidation of a Mortgage Loan that are Nonrecoverable Advances, but only to the extent that Late Collections, Liquidation Proceeds and Insurance Proceeds

received with respect to such Mortgage Loan are insufficient to reimburse the Master Servicer or any Sub-Servicer for Servicing Advances;

(iv) to pay to the Master Servicer as servicing compensation (in addition to the Servicing Fee) on the Master Servicer Remittance Date any interest or investment income earned on funds deposited in the Collection Account;

(v) to pay to the Originator, with respect to each Mortgage Loan that has previously been purchased or replaced pursuant to Section 2.03 or Section 3.16(c) all amounts received thereon subsequent to the date of purchase or substitution, as the case may be;

(vi) to reimburse the Master Servicer for any Advance or Servicing Advance previously made which the Master Servicer has determined to be a Nonrecoverable Advance in accordance with the provisions of Section 4.03;

(vii) to pay, or to reimburse the Master Servicer for Servicing Advances in respect of, expenses incurred in connection with any Mortgage Loan pursuant to Section 3.16(b);

(viii) to reimburse the Master Servicer for expenses incurred by or reimbursable to the Master Servicer pursuant to Section 6.03;

(ix) to reimburse the NIMS Insurer, the Master Servicer (if the Master Servicer is not an Affiliate of the Originator) or the Trustee, as the case may be, for enforcement expenses reasonably incurred in respect of the breach or defect giving rise to the purchase obligation under Section 2.03 of this Agreement that were included in the Purchase Price of the Mortgage Loan, including any expenses arising out of the enforcement of the purchase obligation;

(x)	to pay itself any Prepayment Interest Excess; and
(xi)	to clear and terminate the Collection Account pursuant to Section 9.01.

The foregoing requirements for withdrawal from the Collection Account shall be exclusive. In the event the Master Servicer shall deposit in the Collection Account any amount not required to be deposited therein, it may at any time withdraw such amount from the Collection Account, any provision herein to the contrary notwithstanding.

The Master Servicer shall keep and maintain separate accounting, on a Mortgage Loan by Mortgage Loan basis, for the purpose of justifying any withdrawal from the Collection Account, to the extent held by or on behalf of it, pursuant to subclauses (ii), (iii), (iv), (v), (vi), (vii) and (viii) above. The Master Servicer shall provide written notification to the NIMS Insurer and the Trustee, on or prior to the next succeeding Master Servicer Remittance Date, upon making any withdrawals from the Collection Account pursuant to subclause (vi) above; provided that an Officers’ Certificate in the form described under Section 4.03(d) shall suffice for such written notification to the Trustee in respect hereof.

(b) The Trustee shall, from time to time, make withdrawals from the Distribution Account, for any of the following purposes, without priority:

(i)	to make distributions in accordance with Section 4.01;

(ii) to pay itself the Trustee Fee and any Extraordinary Trust Fund Expenses pursuant to Section 8.05;

(iii)	to pay any amounts in respect of taxes pursuant to Section 10.01(g);
(iv)	to clear and terminate the Distribution Account pursuant to Section 9.01;

(v) to pay any amounts required to be paid to the Trustee pursuant to this Agreement, including but not limited to funds required to be paid pursuant to Section 3.06 and Section 7.02;

(vi) to pay to the Trustee, any interest or investment income earned on funds deposited in the Distribution Account;

(vii) to pay to an Advancing Person reimbursements for Advances and/or Servicing Advances pursuant to Section 3.29; and

(viii) to pay each PMI Insurer the related PMI Insurer Fee (which payment shall be prior to any payments and reimbursements pursuant to clauses (i), (iii), (iv), (v), (vi) and (vii) above).

Section 3.12.

Investment of Funds in the Collection Account and the Distribution Account.

(a) The Master Servicer may direct any depository institution maintaining the Collection Account and any REO Account to invest the funds on deposit in such accounts, and the Trustee may invest the funds on deposit in the Distribution Account (each such account, for the purposes of this Section 3.12 an “Investment Account”). All investments pursuant to this Section 3.12 shall be in one or more Permitted Investments bearing interest or sold at a discount, and maturing, unless payable on demand, (i) no later than the Business Day immediately preceding the date on which such funds are required to be withdrawn from such account pursuant to this Agreement, if a Person other than the Trustee is the obligor thereon or if such investment is managed or advised by a Person other than the Trustee or an Affiliate of the Trustee, and (ii) no later than the date on which such funds are required to be withdrawn from such account pursuant to this Agreement, if the Trustee is the obligor thereon or if such investment is managed or advised by the Trustee or any Affiliate. All such Permitted Investments shall be held to maturity, unless payable on demand. Any investment of funds in an Investment Account shall be made in the name of the Trustee (in its capacity as such), or in the name of a nominee of the Trustee. The Trustee shall be entitled to sole possession (except with respect to investment direction of funds held in the Collection Account or any REO Account and any income and gain realized thereon) over each such investment, and any certificate or other instrument evidencing any such investment shall be delivered directly to the Trustee or its agent, together with any

document of transfer necessary to transfer title to such investment to the Trustee or its nominee. In the event amounts on deposit in an Investment Account are at any time invested in a Permitted Investment payable on demand, the Trustee shall:

(x) consistent with any notice required to be given thereunder, demand that payment thereon be made on the last day such Permitted Investment may otherwise mature hereunder in an amount equal to the lesser of (1) all amounts then payable thereunder and (2) the amount required to be withdrawn on such date; and

(y) demand payment of all amounts due thereunder promptly upon determination by a Responsible Officer of the Trustee that such Permitted Investment would not constitute a Permitted Investment in respect of funds thereafter on deposit in the Investment Account.

(b) All income and gain realized from the investment of funds deposited in the Collection Account and any REO Account held by or on behalf of the Master Servicer shall be for the benefit of the Master Servicer and shall be subject to its withdrawal in accordance with Section 3.11 or Section 3.23, as applicable. The Master Servicer shall deposit in the Collection Account or any REO Account, as applicable, the amount of any loss of principal incurred in respect of any such Permitted Investment made with funds in such account immediately upon realization of such loss.

(c) All income and gain realized from the investment of funds deposited in the Distribution Account shall be for the benefit of the Trustee. The Trustee shall deposit in the Distribution Account the amount of any loss of principal incurred in respect of any such Permitted Investment made with funds in such accounts immediately upon realization of such loss.

(d) Except as otherwise expressly provided in this Agreement, if any default occurs in the making of a payment due under any Permitted Investment, or if a default occurs in any other performance required under any Permitted Investment, the Trustee may and, subject to Section 8.01 and Section 8.02(a)(v), upon the request of the NIMS Insurer or the Holders of Certificates representing more than 50% of the Voting Rights allocated to any Class of Certificates, shall take such action as may be appropriate to enforce such payment or performance, including the institution and prosecution of appropriate proceedings.

Section 3.13.

[Reserved].

Section 3.14.

Maintenance of Hazard Insurance and Errors and Omissions and Fidelity Coverage.

(a) The Master Servicer shall cause to be maintained for each Mortgage Loan hazard insurance with extended coverage on the Mortgaged Property in an amount which is at least equal to the lesser of (i) the current Principal Balance of such Mortgage Loan and (ii) the amount necessary to fully compensate for any damage or loss to the improvements that are a part of such property on a replacement cost basis, in each case in an amount not less than such amount as is necessary to avoid the application of any coinsurance clause contained in the related

hazard insurance policy. The Master Servicer shall also cause to be maintained hazard insurance with extended coverage on each REO Property in an amount which is at least equal to the lesser of (i) the maximum insurable value of the improvements which are a part of such property and (ii) the outstanding Principal Balance of the related Mortgage Loan at the time it became an REO Property. The Master Servicer will comply in the performance of this Agreement with all reasonable rules and requirements of each insurer under any such hazard policies. Any amounts to be collected by the Master Servicer under any such policies (other than amounts to be applied to the restoration or repair of the property subject to the related Mortgage or amounts to be released to the Mortgagor in accordance with the procedures that the Master Servicer would follow in servicing loans held for its own account, subject to the terms and conditions of the related Mortgage and Mortgage Note) shall be deposited in the Collection Account, subject to withdrawal pursuant to Section 3.11, if received in respect of a Mortgage Loan, or in the REO Account, subject to withdrawal pursuant to Section 3.23, if received in respect of an REO Property. Any cost incurred by the Master Servicer in maintaining any such insurance shall not, for the purpose of calculating distributions to Certificateholders, be added to the unpaid Principal Balance of the related Mortgage Loan, notwithstanding that the terms of such Mortgage Loan so permit. It is understood and agreed that no earthquake or other additional insurance is to be required of any Mortgagor other than pursuant to such applicable laws and regulations as shall at any time be in force and as shall require such additional insurance. If the Mortgaged Property or REO Property is at any time in an area identified in the Federal Register by the Federal Emergency Management Agency as having special flood hazards and flood insurance has been made available, the Master Servicer will cause to be maintained a flood insurance policy in respect thereof. Such flood insurance shall be in an amount equal to the lesser of (i) the unpaid Principal Balance of the related Mortgage Loan and (ii) the maximum amount of such insurance available for the related Mortgaged Property under the national flood insurance program (assuming that the area in which such Mortgaged Property is located is participating in such program).

In the event that the Master Servicer shall obtain and maintain a blanket policy with an insurer having a General Policy Rating of B:III or better in Best’s Key Rating Guide (or such other rating that is comparable to such rating) insuring against hazard losses on all of the Mortgage Loans, it shall conclusively be deemed to have satisfied its obligations as set forth in the first two sentences of this Section 3.14, it being understood and agreed that such policy may contain a deductible clause, in which case the Master Servicer shall, in the event that there shall not have been maintained on the related Mortgaged Property or REO Property a policy complying with the first two sentences of this Section 3.14, and there shall have been one or more losses which would have been covered by such policy, deposit to the Collection Account from its own funds the amount not otherwise payable under the blanket policy because of such deductible clause. In connection with its activities as administrator and servicer of the Mortgage Loans, the Master Servicer agrees to prepare and present, on behalf of itself, the Trustee and Certificateholders, claims under any such blanket policy in a timely fashion in accordance with the terms of such policy.

(b) The Master Servicer shall keep in force during the term of this Agreement a policy or policies of insurance covering errors and omissions for failure in the performance of the Master Servicer’s obligations under this Agreement, which policy or policies shall be in such

form and amount that would meet the requirements of Fannie Mae or Freddie Mac if it were the purchaser of the Mortgage Loans, unless the Master Servicer has obtained a waiver of such requirements from Fannie Mae or Freddie Mac. The Master Servicer shall provide the Trustee and the NIMS Insurer, upon request, with copies of such insurance policies and fidelity bond. The Master Servicer shall also maintain a fidelity bond in the form and amount that would meet the requirements of Fannie Mae or Freddie Mac, unless the Master Servicer has obtained a waiver of such requirements from Fannie Mae or Freddie Mac. The Master Servicer shall be deemed to have complied with this provision if an Affiliate of the Master Servicer has such errors and omissions and fidelity bond coverage and, by the terms of such insurance policy or fidelity bond, the coverage afforded thereunder extends to the Master Servicer. Any such errors and omissions policy and fidelity bond shall by its terms not be cancelable without thirty days’ prior written notice to the Trustee and the NIMS Insurer. The Master Servicer shall also cause each Sub-Servicer to maintain a policy of insurance covering errors and omissions and a fidelity bond which would meet such requirements.

Section 3.15.

Enforcement of Due-On-Sale Clauses; Assumption Agreements.

The Master Servicer will, to the extent it has knowledge of any conveyance or prospective conveyance of any Mortgaged Property by any Mortgagor (whether by absolute conveyance or by contract of sale, and whether or not the Mortgagor remains or is to remain liable under the Mortgage Note and/or the Mortgage), exercise its rights to accelerate the maturity of such Mortgage Loan under the “due-on-sale” clause, if any, applicable thereto; provided, however, that the Master Servicer shall not be required to take such action if in its sole business judgment the Master Servicer believes it is not in the best interests of the Trust Fund and shall not exercise any such rights if prohibited by law from doing so. If the Master Servicer reasonably believes it is unable under applicable law to enforce such “due-on-sale” clause, or if any of the other conditions set forth in the proviso to the preceding sentence apply, the Master Servicer will enter into an assumption and modification agreement from or with the person to whom such property has been conveyed or is proposed to be conveyed, pursuant to which such person becomes liable under the Mortgage Note and, to the extent permitted by applicable state law, the Mortgagor remains liable thereon. The Master Servicer is also authorized to enter into a substitution of liability agreement with such person, pursuant to which the original Mortgagor is released from liability and such person is substituted as the Mortgagor and becomes liable under the Mortgage Note, provided that no such substitution shall be effective unless such person satisfies the underwriting criteria of the Master Servicer and has a credit risk rating at least equal to that of the original Mortgagor. In connection with any assumption or substitution, the Master Servicer shall apply such underwriting standards and follow such practices and procedures as shall be normal and usual in its general mortgage servicing activities and as it applies to other mortgage loans owned solely by it. The Master Servicer shall not take or enter into any assumption and modification agreement, however, unless (to the extent practicable in the circumstances) it shall have received confirmation, in writing, of the continued effectiveness of any applicable hazard insurance policy. Any fee collected by the Master Servicer in respect of an assumption, modification or substitution of liability agreement shall be retained by the Master Servicer as additional servicing compensation. In connection with any such assumption, no material term of the Mortgage Note (including but not limited to the related Mortgage Rate and the amount of the Monthly Payment) may be amended or modified, except as otherwise required

pursuant to the terms thereof. The Master Servicer shall notify the Trustee that any such substitution, modification or assumption agreement has been completed by forwarding to the Trustee the executed original of such substitution, modification or assumption agreement, which document shall be added to the related Mortgage File and shall, for all purposes, be considered a part of such Mortgage File to the same extent as all other documents and instruments constituting a part thereof.

Notwithstanding the foregoing paragraph or any other provision of this Agreement, the Master Servicer shall not be deemed to be in default, breach or any other violation of its obligations hereunder by reason of any assumption of a Mortgage Loan by operation of law or by the terms of the Mortgage Note or any assumption which the Master Servicer may be restricted by law from preventing, for any reason whatever. For purposes of this Section 3.15, the term “assumption” is deemed to also include a sale (of the Mortgaged Property) subject to the Mortgage that is not accompanied by an assumption or substitution of liability agreement.

Section 3.16.

Realization Upon Defaulted Mortgage Loans.

(a) The Master Servicer shall use its best efforts, in as practical a time frame as possible and consistent with Servicing Standard, to foreclose upon or otherwise comparably convert the ownership of properties securing such of the Mortgage Loans as come into and continue in default and as to which no satisfactory arrangements can be made for collection of delinquent payments pursuant to Section 3.07. The Master Servicer shall be responsible for all costs and expenses incurred by it in any such proceedings; provided, however, that such costs and expenses will be recoverable as Servicing Advances by the Master Servicer as contemplated in Section 3.11 and Section 3.23. The foregoing is subject to the provision that, in any case in which a Mortgaged Property shall have suffered damage from an Uninsured Cause, the Master Servicer shall not be required to expend its own funds toward the restoration of such property unless it shall determine in its discretion that such restoration will increase the proceeds of liquidation of the related Mortgage Loan after reimbursement to itself for such expenses.

(b) Notwithstanding the foregoing provisions of this Section 3.16 or any other provision of this Agreement, with respect to any Mortgage Loan as to which the Master Servicer has received actual notice of, or has actual knowledge of, the presence of any toxic or hazardous substance on the related Mortgaged Property, the Master Servicer shall not, on behalf of the Trustee, either (i) obtain title to such Mortgaged Property as a result of or in lieu of foreclosure or otherwise, or (ii) otherwise acquire possession of, or take any other action with respect to, such Mortgaged Property, if, as a result of any such action, the Trustee, the Trust Fund or the Certificateholders would be considered to hold title to, to be a “mortgagee-in-possession” of, or to be an “owner” or “operator” of such Mortgaged Property within the meaning of the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended from time to time, or any comparable law, unless the Master Servicer has also previously determined, based on its reasonable judgment and a report prepared by a Person who regularly conducts environmental audits using customary industry standards, that:

(1) such Mortgaged Property is in compliance with applicable environmental laws or, if not, that it would be in the best economic interest of the Trust Fund to take

such actions as are necessary to bring the Mortgaged Property into compliance therewith; and

(2) there are no circumstances present at such Mortgaged Property relating to the use, management or disposal of any hazardous substances, hazardous materials, hazardous wastes, or petroleum-based materials for which investigation, testing, monitoring, containment, clean-up or remediation could be required under any federal, state or local law or regulation, or that if any such materials are present for which such action could be required, that it would be in the best economic interest of the Trust Fund to take such actions with respect to the affected Mortgaged Property.

Notwithstanding the foregoing, if such environmental audit reveals, or if the Master Servicer has actual knowledge or notice, that such Mortgaged Property contains such wastes or substances, the Master Servicer shall not foreclose or accept a deed in lieu of foreclosure without the prior written consent of the NIMS Insurer.

The cost of the environmental audit report contemplated by this Section 3.16 shall be advanced by the Master Servicer, subject to the Master Servicer’s right to be reimbursed therefor from the Collection Account as provided in Section 3.11(a)(vii), such right of reimbursement being prior to the rights of Certificateholders to receive any amount in the Collection Account received in respect of the affected Mortgage Loan or other Mortgage Loans.

If the Master Servicer determines, as described above, that it is in the best economic interest of the Trust Fund to take such actions as are necessary to bring any such Mortgaged Property into compliance with applicable environmental laws, or to take such action with respect to the containment, clean-up or remediation of hazardous substances, hazardous materials, hazardous wastes or petroleum-based materials affecting any such Mortgaged Property, then the Master Servicer shall take such action as it deems to be in the best economic interest of the Trust Fund; provided that any amounts disbursed by the Master Servicer pursuant to this Section 3.16(b) shall constitute Servicing Advances, subject to Section 4.03(d). The cost of any such compliance, containment, cleanup or remediation shall be advanced by the Master Servicer, subject to the Master Servicer’s right to be reimbursed therefor from the Collection Account as provided in Section 3.11(a)(iii) and (a)(vii), such right of reimbursement being prior to the rights of Certificateholders to receive any amount in the Collection Account received in respect of the affected Mortgage Loan or other Mortgage Loans.

(c)(i) The NIMS Insurer may, at its option, purchase a Mortgage Loan which has become 90 or more days delinquent or for which the Master Servicer has accepted a deed in lieu of foreclosure. Prior to purchase pursuant to this Section 3.16(c)(i), the Master Servicer shall be required to continue to make Advances pursuant to Section 4.03. The NIMS Insurer shall not use any procedure in selecting Mortgage Loans to be repurchased which is materially adverse to the interests of the Certificateholders. The NIMS Insurer shall purchase such delinquent Mortgage Loan at a price equal to the Purchase Price of such Mortgage Loan. Any such purchase of a Mortgage Loan pursuant to this Section 3.16(c)(i) shall be accomplished by remittance to the Master Servicer for deposit in the Collection Account of the amount of the Purchase Price. The Trustee shall immediately effectuate the conveyance of such delinquent

Mortgage Loan to the NIMS Insurer to the extent necessary to vest in the NIMS Insurer title to such Mortgage Loan, including the prompt delivery of all documentation to the NIMS Insurer.

(ii) The Master Servicer may, at its option, purchase a Mortgage Loan which has become 90 or more days delinquent or for which the Master Servicer has accepted a deed in lieu of foreclosure. Prior to purchase pursuant to this Section 3.16(c)(ii), the Master Servicer shall be required to continue to make Advances pursuant to Section 4.03. The Master Servicer shall purchase such delinquent Mortgage Loan at a price equal to the Purchase Price of such Mortgage Loan. Any such purchase of a Mortgage Loan pursuant to this Section 3.16(c)(ii) shall be accomplished by deposit in the Collection Account of the amount of the Purchase Price. The Trustee shall immediately effectuate the conveyance of such delinquent Mortgage Loan to the Master Servicer to the extent necessary, including the prompt delivery of all documentation to the Master Servicer.

Notwithstanding the foregoing: (A) if the Master Servicer purchases any delinquent Mortgage Loans pursuant to this Section 3.16(c)(ii), it must purchase Mortgage Loans that are delinquent the greatest number of days before it may purchase any that are delinquent any fewer number of days; (B) if the Master Servicer purchases some but not all Mortgage Loans that are delinquent any given number of days, it must purchase Mortgage Loans having the same delinquency status in the order of lowest Principal Balance to highest Principal Balance; and (C) the Master Servicer may at any time relinquish its rights to purchase delinquent Mortgage Loans pursuant to this Section 3.16(c)(ii) in writing delivered to the Trustee, and from and after the taking of such action by the Master Servicer, the provisions of this Section 3.16(c)(ii) shall no longer be of any force or effect.

(d) Proceeds received in connection with any Final Recovery Determination, as well as any recovery resulting from a partial collection of Insurance Proceeds, Liquidation Proceeds or condemnation proceeds, in respect of any Mortgage Loan, will be applied in the following order of priority: first, to unpaid Servicing Fees; second, to reimburse the Master Servicer or any Sub-Servicer for any related unreimbursed Servicing Advances pursuant to Section 3.11(a)(iii) and Advances pursuant to Section 3.11(a)(ii); third, to accrued and unpaid interest on the Mortgage Loan, to the date of the Final Recovery Determination, or to the Due Date prior to the Distribution Date on which such amounts are to be distributed if not in connection with a Final Recovery Determination; and fourth, as a recovery of principal of the Mortgage Loan. The portion of the recovery so allocated to unpaid Servicing Fees shall be reimbursed to the Master Servicer or any Sub-Servicer pursuant to Section 3.11(a)(iii).

Section 3.17.

Trustee to Cooperate; Release of Mortgage Files.

(a) Upon the payment in full of any Mortgage Loan, or the receipt by the Master Servicer of a notification that payment in full shall be escrowed in a manner customary for such purposes, the Master Servicer shall deliver to the Trustee, in written (with two executed copies) or electronic format, a Request for Release in the form of Exhibit E (which certification shall include a statement to the effect that all amounts received or to be received in connection with such payment which are required to be deposited in the Collection Account pursuant to Section 3.10 have been or will be so deposited) signed by a Servicing Officer (or in a mutually agreeable electronic format that will, in lieu of a signature on its face, originate from a Servicing

Officer) and shall request delivery to it of the Mortgage File. Upon receipt of such certification and request, the Trustee shall, within three Business Days, release and send by overnight mail, at the expense of the Master Servicer, the related Mortgage File to the Master Servicer. The Trustee agrees to indemnify the Master Servicer, out of its own funds, for any loss, liability or expense (other than special, indirect, punitive or consequential damages which will not be paid by the Trustee) incurred by the Master Servicer as a proximate result of the Trustee’s breach of its obligations pursuant to this Section 3.17. No expenses incurred in connection with any instrument of satisfaction or deed of re-conveyance shall be chargeable to the Collection Account or the Distribution Account.

(b) From time to time and as appropriate for the servicing or foreclosure of any Mortgage Loan, including, for this purpose, collection under any insurance policy relating to the Mortgage Loans, the Trustee shall, upon any request made by or on behalf of the Master Servicer and delivery to the Trustee, in written (with two executed copies) or electronic format, of a Request for Release in the form of Exhibit E signed by a Servicing Officer (or in a mutually agreeable electronic format that will, in lieu of a signature on its face, originate from a Servicing Officer), release the related Mortgage File to the Master Servicer within three Business Days, and the Trustee shall, at the direction of the Master Servicer, execute such documents as shall be necessary to the prosecution of any such proceedings. Such Request for Release shall obligate the Master Servicer to return each and every document previously requested from the Mortgage File to the Trustee when the need therefor by the Master Servicer no longer exists, unless the Mortgage Loan has been liquidated and the Liquidation Proceeds relating to the Mortgage Loan have been deposited in the Collection Account or the Mortgage File or such document has been delivered to an attorney, or to a public trustee or other public official as required by law, for purposes of initiating or pursuing legal action or other proceedings for the foreclosure of the Mortgaged Property either judicially or non-judicially, and the Master Servicer has delivered, or caused to be delivered, to the Trustee an additional Request for Release certifying as to such liquidation or action or proceedings. Upon the request of the Trustee, the Master Servicer shall provide notice to the Trustee of the name and address of the Person to which such Mortgage File or such document was delivered and the purpose or purposes of such delivery. Upon receipt of a Request for Release, in written (with two executed copies) or electronic format, from a Servicing Officer stating that such Mortgage Loan was liquidated and that all amounts received or to be received in connection with such liquidation that are required to be deposited into the Collection Account have been so deposited, or that such Mortgage Loan has become an REO Property, such Mortgage Loan shall be released by the Trustee to the Master Servicer or its designee.

(c) Upon written certification of a Servicing Officer, the Trustee shall execute and deliver to the Master Servicer or the Sub-Servicer, as the case may be, copies of, any court pleadings, requests for trustee’s sale or other documents necessary to the foreclosure or trustee’s sale in respect of a Mortgaged Property or to any legal action brought to obtain judgment against any Mortgagor on the Mortgage Note or Mortgage or to obtain a deficiency judgment, or to enforce any other remedies or rights provided by the Mortgage Note or Mortgage or otherwise available at law or in equity. Each such certification shall include a request that such pleadings or documents be executed by the Trustee and a statement as to the reason such documents or pleadings are required and that the execution and delivery thereof by the Trustee will not

invalidate or otherwise affect the lien of the Mortgage, except for the termination of such a lien upon completion of the foreclosure or trustee’s sale.

Section 3.18.

Servicing Compensation.

As compensation for the activities of the Master Servicer hereunder, the Master Servicer shall be entitled to the Servicing Fee with respect to each Mortgage Loan payable solely from payments of interest in respect of such Mortgage Loan, subject to Section 3.24. In addition, the Master Servicer shall be entitled to recover unpaid Servicing Fees out of Insurance Proceeds, Liquidation Proceeds or condemnation proceeds to the extent permitted by Section 3.11(a)(iii) and out of amounts derived from the operation and sale of an REO Property to the extent permitted by Section 3.23. Except as provided in Section 3.29 and Section 6.06, the right to receive the Servicing Fee may not be transferred in whole or in part except in connection with the transfer of all of the Master Servicer’s responsibilities and obligations under this Agreement; provided, however, that the Master Servicer may pay from the Servicing Fee any amounts due to a Sub-Servicer pursuant to a Sub-Servicing Agreement entered into under Section 3.02.

Additional servicing compensation in the form of assumption fees, late payment charges, insufficient funds charges, ancillary income or otherwise (other than Prepayment Charges) shall be retained by the Master Servicer only to the extent such fees or charges are received by the Master Servicer. The Master Servicer shall also be entitled pursuant to Section 3.11(a)(iv) to withdraw from the Collection Account and pursuant to Section 3.23(b) to withdraw from any REO Account, as additional servicing compensation, interest or other income earned on deposits therein, subject to Section 3.12 and Section 3.24. The Master Servicer shall be required to pay all expenses incurred by it in connection with its servicing activities hereunder (including premiums for the insurance required by Section 3.14, to the extent such premiums are not paid by the related Mortgagors or by a Sub-Servicer and servicing compensation of each Sub-Servicer) and shall not be entitled to reimbursement therefor except as specifically provided herein.

The Master Servicer shall be entitled to any Prepayment Interest Excess, which it may withdraw from the Collection Account pursuant to Section 3.11(a)(ix).

Section 3.19.

Reports to the Trustee; Collection Account Statements.

Not later than twenty days after each Distribution Date, the Master Servicer shall forward to the Trustee, the NIMS Insurer and the Depositor the most current available bank statement for the Collection Account. Copies of such statement shall be provided by the Trustee to any Certificateholder and to any Person identified to the Trustee as a prospective transferee of a Certificate, upon request at the expense of the requesting party, provided such statement is delivered by the Master Servicer to the Trustee.

Section 3.20.

Statement as to Compliance.

The Master Servicer will deliver to the Trustee, the NIMS Insurer and the Depositor not later than March 10^th of each calendar year, commencing in 2006, an Officers’ Certificate stating, as to each signatory thereof, that (i) a review of the activities of the Master

Servicer during the preceding calendar year and of performance under this Agreement has been made under such officers’ supervision and (ii) to the best of such officers’ knowledge, based on such review, the Master Servicer has fulfilled all of its obligations under this Agreement throughout such year, or, if there has been a default in the fulfillment of any such obligation, specifying each such default known to such officer and the nature and status thereof. Copies of any such statement shall be provided by the Trustee to any Certificateholder and to any Person identified to the Trustee as a prospective transferee of a Certificate, upon request at the expense of the requesting party, provided such statement is delivered by the Master Servicer to the Trustee.

Section 3.21.

Independent Public Accountants’ Servicing Report.

Not later than March 10^th of each calendar year, commencing in 2006, the Master Servicer, at its expense, shall cause a nationally recognized firm of independent certified public accountants to furnish to the Master Servicer a report stating that (i) it has obtained a letter of representation regarding certain matters from the management of the Master Servicer which includes an assertion that the Master Servicer has complied with certain minimum residential mortgage loan servicing standards, identified in the Uniform Single Attestation Program for Mortgage Bankers established by the Mortgage Bankers Association of America, with respect to the servicing of residential mortgage loans during the most recently completed calendar year and (ii) on the basis of an examination conducted by such firm in accordance with standards established by the American Institute of Certified Public Accountants, such representation is fairly stated in all material respects, subject to such exceptions and other qualifications that may be appropriate. In rendering its report such firm may rely, as to matters relating to the direct servicing of residential mortgage loans by Sub-Servicers, upon comparable reports of firms of independent certified public accountants rendered on the basis of examinations conducted in accordance with the same standards (rendered within one year of such report) with respect to those Sub-Servicers. Immediately upon receipt of such report, the Master Servicer shall furnish a copy of such report to the Trustee, the NIMS Insurer and each Rating Agency. Copies of such statement shall be provided by the Trustee to any Certificateholder upon request at the Master Servicer’s expense, provided that such statement is delivered by the Master Servicer to the Trustee.

Section 3.22.

Access to Certain Documentation.

The Master Servicer shall provide to the Office of Thrift Supervision, the FDIC, and any other federal or state banking or insurance regulatory authority that may exercise authority over any Certificateholder, access to the documentation regarding the Mortgage Loans required by applicable laws and regulations. Such access shall be afforded without charge, but only upon reasonable request and during normal business hours at the offices of the Master Servicer designated by it. In addition, access to the documentation regarding the Mortgage Loans will be provided to any Certificateholder, the Trustee, the NIMS Insurer and to any Person identified to the Master Servicer as a prospective transferee of a Certificate, upon reasonable request during normal business hours at the offices of the Master Servicer designated by it at the expense of the Person requesting such access.

Section 3.23.

Title, Management and Disposition of REO Property.

(a) The deed or certificate of sale of any REO Property shall be taken in the name of Wells Fargo Bank, N.A., as Trustee for MASTR Asset Backed Securities Trust 2005-OPT1 or its nominee or the name of any successor Trustee, its nominee or any successor, in trust for the benefit of the Certificateholders of MASTR Asset Backed Securities Trust 2005-OPT1. The Master Servicer, on behalf of REMIC I, shall sell any REO Property as soon as practical and in any event no later than the end of the third full taxable year after the taxable year in which such REMIC acquires ownership of such REO Property for purposes of Section 860G(a)(8) of the Code or request from the Internal Revenue Service, no later than 60 days before the day on which the three-year grace period would otherwise expire, an extension of such three-year period, unless the Master Servicer shall have delivered to the Trustee and the NIMS Insurer an Opinion of Counsel acceptable to the NIMS Insurer and addressed to the Trustee, the NIMS Insurer and the Depositor, to the effect that the holding by the REMIC of such REO Property subsequent to three years after its acquisition will not result in the imposition on the REMIC of taxes on “prohibited transactions” thereof, as defined in Section 860F of the Code, or cause any of the REMICs created hereunder to fail to qualify as a REMIC under Federal law at any time that any Certificates are outstanding. The Master Servicer shall manage, conserve, protect and operate each REO Property for the Certificateholders solely for the purpose of its prompt disposition and sale in a manner which does not cause such REO Property to fail to qualify as “foreclosure property” within the meaning of Section 860G(a)(8) of the Code or result in the receipt by any of the REMICs created hereunder of any “income from non-permitted assets” within the meaning of Section 860F(a)(2)(B) of the Code, or any “net income from foreclosure property” which is subject to taxation under the REMIC Provisions.

(b) The Master Servicer shall separately account for all funds collected and received in connection with the operation of any REO Property and shall establish and maintain, or cause to be established and maintained, with respect to REO Properties an account held in trust for the Trustee for the benefit of the Certificateholders (the “REO Account”), which shall be an Eligible Account. The Master Servicer shall be permitted to allow the Collection Account to serve as the REO Account, subject to separate ledgers for each REO Property. The Master Servicer shall be entitled to retain or withdraw any interest income paid on funds deposited in the REO Account.

(c) The Master Servicer shall have full power and authority, subject only to the specific requirements and prohibitions of this Agreement, to do any and all things in connection with any REO Property as are consistent with the manner in which the Master Servicer manages and operates similar property owned by the Master Servicer or any of its Affiliates, all on such terms and for such period (subject to the requirement of prompt disposition set forth in Section 3.23(a)) as the Master Servicer deems to be in the best interests of Certificateholders. In connection therewith, the Master Servicer shall deposit, or cause to be deposited in the clearing account in which it customarily deposits payments and collections on mortgage loans in connection with its mortgage loan servicing activities on a daily basis, and in no event more than one Business Day after the Master Servicer’s receipt thereof, and shall thereafter deposit in the REO Account, in no event more than two Business Days after the Master Servicer’s receipt thereof, all revenues received by it with respect to an REO Property

and shall withdraw therefrom funds necessary for the proper operation, management and maintenance of such REO Property including, without limitation:

(i)	all insurance premiums due and payable in respect of such REO Property;

(ii) all real estate taxes and assessments in respect of such REO Property that may result in the imposition of a lien thereon; and

(iii)

all costs and expenses necessary to maintain such REO Property.

To the extent that amounts on deposit in the REO Account with respect to an REO Property are insufficient for the purposes set forth in clauses (i) through (iii) above with respect to such REO Property, the Master Servicer shall advance from its own funds such amount as is necessary for such purposes if, but only if, the Master Servicer would make such advances if the Master Servicer owned the REO Property and if in the Master Servicer’s judgment, the payment of such amounts will be recoverable from the rental or sale of the REO Property.

Notwithstanding the foregoing, neither the Master Servicer nor the Trustee shall:

(A) authorize the Trust Fund to enter into, renew or extend any New Lease with respect to any REO Property, if the New Lease by its terms will give rise to any income that does not constitute Rents from Real Property;

(B) authorize any amount to be received or accrued under any New Lease other than amounts that will constitute Rents from Real Property;

(C) authorize any construction on any REO Property, other than the completion of a building or other improvement thereon, and then only if more than ten percent of the construction of such building or other improvement was completed before default on the related Mortgage Loan became imminent, all within the meaning of Section 856(e)(4)(B) of the Code; or

(D) authorize any Person to Directly Operate any REO Property on any date more than 90 days after its date of acquisition by the Trust Fund;

unless, in any such case, the Master Servicer has obtained an Opinion of Counsel, provided to the Trustee and the NIMS Insurer, to the effect that such action will not cause such REO Property to fail to qualify as “foreclosure property” within the meaning of Section 860G(a)(8) of the Code at any time that it is held by the REMIC, in which case the Master Servicer may take such actions as are specified in such Opinion of Counsel.

The Master Servicer may contract with any Independent Contractor for the operation and management of any REO Property, provided that:

(1) the terms and conditions of any such contract shall not be inconsistent herewith;

(2) any such contract shall require, or shall be administered to require, that the Independent Contractor pay all costs and expenses incurred in connection with the operation and management of such REO Property, including those listed above and remit all related revenues (net of such costs and expenses) to the Master Servicer as soon as practicable, but in no event later than thirty days following the receipt thereof by such Independent Contractor;

(3) none of the provisions of this Section 3.23(c) relating to any such contract or to actions taken through any such Independent Contractor shall be deemed to relieve the Master Servicer of any of its duties and obligations to the Trustee on behalf of the Certificateholders with respect to the operation and management of any such REO Property; and

(4) the Master Servicer shall be obligated with respect thereto to the same extent as if it alone were performing all duties and obligations in connection with the operation and management of such REO Property.

The Master Servicer shall be entitled to enter into any agreement with any Independent Contractor performing services for it related to its duties and obligations hereunder for indemnification of the Master Servicer by such Independent Contractor, and nothing in this Agreement shall be deemed to limit or modify such indemnification. The Master Servicer shall be solely liable for all fees owed by it to any such Independent Contractor, irrespective of whether the Master Servicer’s compensation pursuant to Section 3.18 is sufficient to pay such fees; provided, however, that to the extent that any payments made by such Independent Contractor would constitute Servicing Advances if made by the Master Servicer, such amounts shall be reimbursable as Servicing Advances made by the Master Servicer.

(d) In addition to the withdrawals permitted under Section 3.23(c), the Master Servicer may from time to time make withdrawals from the REO Account for any REO Property: (i) to pay itself or any Sub-Servicer unpaid Servicing Fees in respect of the related Mortgage Loan; and (ii) to reimburse itself or any Sub-Servicer for unreimbursed Servicing Advances and Advances made in respect of such REO Property or the related Mortgage Loan. Upon liquidation of any REO Property, the Master Servicer shall withdraw from each REO Account maintained by it and deposit into the Distribution Account in accordance with Section 3.10(d)(ii), for distribution on the related Distribution Date in accordance with Section 4.01, any income from the related REO Property received by the Master Servicer, net of any withdrawals made pursuant to Section 3.23(c) or this Section 3.23(d)

(e) Subject to the time constraints set forth in Section 3.23(a), each REO Disposition shall be carried out by the Master Servicer in a manner, at such price and upon such terms and conditions as shall be normal and usual in its Servicing Standard.

(f) The proceeds from the REO Disposition, net of any amount required by law to be remitted to the Mortgagor under the related Mortgage Loan and net of any payment or reimbursement to the Master Servicer or any Sub-Servicer as provided above, shall be deposited in the Distribution Account in accordance with Section 3.10(d)(ii) on the Master Servicer Remittance Date in the month following the receipt thereof for distribution on the related

Distribution Date in accordance with Section 4.01. Any REO Disposition shall be for cash only (unless changes in the REMIC Provisions made subsequent to the Startup Day allow a sale for other consideration).

(g) The Master Servicer shall file information returns with respect to the receipt of mortgage interest received in a trade or business, reports of foreclosures and abandonments of any Mortgaged Property and cancellation of indebtedness income with respect to any Mortgaged Property as required by Sections 6050H, 6050J and 6050P of the Code, respectively. Such reports shall be in form and substance sufficient to meet the reporting requirements imposed by such Sections 6050H, 6050J and 6050P of the Code.

Section 3.24.

Obligations of the Master Servicer in Respect of Prepayment

Interest Shortfalls.

Not later than 1:00 p.m. New York time on each Master Servicer Remittance Date, the Master Servicer shall remit to the Distribution Account an amount (“Compensating Interest”) equal to the lesser of (A) the aggregate of the Prepayment Interest Shortfalls for the related Distribution Date and (B) its aggregate Servicing Fee received in the related Due Period, any interest or investment income earned on funds deposited in the Collection Account and any Prepayment Interest Excess earned during the related Prepayment Period. The Master Servicer shall not have the right to reimbursement for any amounts remitted to the Trustee in respect of Compensating Interest. Such amounts so remitted shall be included in the Available Funds and distributed therewith on the next Distribution Date. The Master Servicer shall not be obligated to pay Compensating Interest with respect to Relief Act Interest Shortfalls.

Section 3.25.	[Reserved].
Section 3.26.	Obligations of the Master Servicer in Respect of Mortgage

Rates and Monthly Payments.

In the event that a shortfall in any collection on or liability with respect to the Mortgage Loans in the aggregate results from or is attributable to adjustments to Mortgage Rates, Monthly Payments or Stated Principal Balances that were made by the Master Servicer in a manner not consistent with the terms of the related Mortgage Note and this Agreement, the Master Servicer, upon discovery or receipt of notice thereof, immediately shall deposit in the Collection Account from its own funds the amount of any such shortfall and shall indemnify and hold harmless the Trust Fund, the Trustee, the Depositor and any successor servicer in respect of any such liability. Such indemnities shall survive the termination or discharge of this Agreement. Notwithstanding the foregoing, this Section 3.26 shall not limit the ability of the Master Servicer to seek recovery of any such amounts from the related Mortgagor under the terms of the related Mortgage Note, as permitted by law.

Section 3.27.

Solicitations.

From and after the Closing Date, the Master Servicer agrees that it will not take any action or permit or cause any action to be taken by any of its agents and Affiliates, or by any independent contractors or independent mortgage brokerage companies on the Master Servicer’s

behalf, to personally, by telephone, mail or electronic mail, solicit the Mortgagor under any Mortgage Loan for the purpose of refinancing such Mortgage Loan; provided, that the Master Servicer may solicit any Mortgagor for whom the Master Servicer has received a request for verification of mortgage, a request for demand for payoff, a mortgagor initiated written or verbal communication indicating a desire to prepay the related Mortgage Loan, another mortgage company has pulled a credit report on the mortgagor or the mortgagor initiates a title search; provided further, it is understood and agreed that promotions undertaken by the Master Servicer or any of its Affiliates which (i) concern optional insurance products or other additional products or (ii) are directed to the general public at large, including, without limitation, mass mailings based on commercially acquired mailing lists, newspaper, radio and television advertisements shall not constitute solicitation under this Section, nor is the Master Servicer prohibited from responding to unsolicited requests or inquiries made by a Mortgagor or an agent of a Mortgagor. Furthermore, the Master Servicer shall be permitted to include in its monthly statements to borrowers or otherwise, statements regarding the availability of the Master Servicer’s counseling services with respect to refinancing mortgage loans.

Section 3.28.

Net WAC Rate Carryover Reserve Account.

No later than the Closing Date, the Trustee shall establish and maintain with itself a separate, segregated trust account titled, “Net WAC Rate Carryover Reserve Account, Wells Fargo Bank, N.A., as Trustee, in trust for the registered holders of MASTR Asset Backed Securities Trust 2005-OPT1, Mortgage Pass-Through Certificates.” The amounts deposited in the Net WAC Rate Carryover Reserve Account shall consist of any payments received by the Trustee under the Cap Contracts and deposited into the Net WAC Carryover Reserve Account for the benefit of the Class A Certificates and the Mezzanine Certificates.

On each Distribution Date as to which there is a Net WAC Rate Carryover Amount payable to the Class A Certificates and/or the Mezzanine Certificates, the Trustee has been directed by the Class CE Certificateholders to, and therefore will, deposit into the Net WAC Rate Carryover Reserve Account the amounts described in Section 4.01(a)(4)(xv), rather than distributing such amounts to the Class CE Certificateholders. On each such Distribution Date, the Trustee shall hold all such amounts for the benefit of the Holders of the Class A Certificates and the Mezzanine Certificates, and will distribute such amounts to the Holders of the Class A Certificates and/or the Mezzanine Certificates in the amounts and priorities set forth in Section 4.01(d).

For federal and state income tax purposes, the Class CE Certificateholders will be deemed to be the owners of the Net WAC Rate Carryover Reserve Account and all amounts deposited into the Net WAC Rate Carryover Reserve Account (other than amounts deposited pursuant to a Cap Contract) shall be treated as amounts distributed by REMIC II to the Holders of the Class CE Interest and by REMIC III to the Holders of the Class CE Certificates. Upon the termination of the Trust Fund, or the payment in full of the Class A Certificates and the Mezzanine Certificates, all amounts remaining on deposit in the Net WAC Rate Carryover Reserve Account will be released by the Trust Fund and distributed to the Class CE Certificateholders or their designees. The Net WAC Rate Carryover Reserve Account will be part of the Trust Fund but not part of any REMIC and any payments to the Holders of the Class A Certificates or the Mezzanine Certificates of Net WAC Rate Carryover Amounts will not be

payments with respect to a “regular interest” in a REMIC within the meaning of Code Section 860(G)(a)(1).

By accepting a Class CE Certificate, each Class CE Certificateholder hereby agrees to direct the Trustee, and the Trustee hereby is directed, to deposit into the Net WAC Rate Carryover Reserve Account the amounts described above on each Distribution Date as to which there is any Net WAC Rate Carryover Amount rather than distributing such amounts to the Class CE Certificateholders. By accepting a Class CE Certificate, each Class CE Certificateholder further agrees that such direction is given for good and valuable consideration, the receipt and sufficiency of which is acknowledged by such acceptance.

At the direction of the Holders of a majority in Percentage Interest in the Class CE Certificates, the Trustee shall direct any depository institution maintaining the Net WAC Rate Carryover Reserve Account to invest the funds in such account in one or more Permitted Investments bearing interest or sold at a discount, and maturing, unless payable on demand, (i) no later than the Business Day immediately preceding the date on which such funds are required to be withdrawn from such account pursuant to this Agreement, if a Person other than the Trustee or an Affiliate manages or advises such investment, and (ii) no later than the date on which such funds are required to be withdrawn from such account pursuant to this Agreement, if the Trustee or an Affiliate manages or advises such investment. If no investment direction of the Holders of a majority in Percentage Interest in the Class CE Certificates with respect to the Net WAC Rate Carryover Reserve Account is received by the Trustee, the Trustee shall invest the funds in such account in Permitted Investments managed by the Trustee or an Affiliate of the kind described in clause (vi) of the definition of Permitted Investments. All income and gain earned upon such investment shall be deposited into the Net WAC Rate Carryover Reserve Account.

For federal tax return and information reporting, the value of the right of the Group I Certificateholders, the Group II Certificateholders and the Mezzanine Certificateholders to receive payments from the Net WAC Rate Carryover Reserve Account in respect of any Net Wac Rate Carryover Amount shall be $597,000, $190,000 and $333,000, respectively.

Section 3.29.

Advance Facility

(a) The Master Servicer and/or the Trustee on behalf of the Trust Fund, in either case, with the consent of the NIMS Insurer and the Master Servicer in the case of the Trustee, is hereby authorized to enter into a facility with any Person which provides that such Person (an “Advancing Person”) may fund Advances and/or Servicing Advances to the Trust Fund under this Agreement, although no such facility shall reduce or otherwise affect the Master Servicer’s obligation to fund such Advances and/or Servicing Advances. If the Master Servicer enters into such an Advance Facility pursuant to this Section 3.29, upon reasonable request of the Advancing Person, the Trustee shall execute a letter of acknowledgment, confirming its receipt of notice of the existence of such Advance Facility. To the extent that an Advancing Person funds any Advance or any Servicing Advance and provides the Trustee with notice acknowledged by the Master Servicer that such Advancing Person is entitled to reimbursement, such Advancing Person shall be entitled to receive reimbursement pursuant to this Agreement for such amount to the extent provided in Section 3.29(b). Such notice from the Advancing Person

must specify the amount of the reimbursement, the Section of this Agreement that permits the applicable Advance or Servicing Advance to be reimbursed and the section(s) of the Advance Facility that entitle the Advancing Person to request reimbursement from the Trustee, rather than the Master Servicer, and include the Master Servicer’s acknowledgment thereto or proof of an Event of Default under the Advance Facility. The Trustee shall have no duty or liability with respect to any calculation of any reimbursement to be paid to an Advancing Person and shall be entitled to rely without independent investigation on the Advancing Person’s notice provided pursuant to this Section 3.29. An Advancing Person whose obligations hereunder are limited to the funding of Advances and/or Servicing Advances shall not be required to meet the qualifications of a Master Servicer or a Sub-Servicer pursuant to Section 6.06 hereof and will not be deemed to be a Sub-Servicer under this Agreement. If the terms of a facility proposed to be entered into with an Advancing Person by the Trust Fund would not materially and adversely affect the interests of any Certificateholder, then the NIMS Insurer shall not withhold its consent to the Trust Fund’s entering such facility.

(b) If an Advancing Facility is entered into, then the Master Servicer shall not be permitted to reimburse itself therefor under Section 3.11(a)(ii), Section 3.11(a)(iii), Section 3.11(a)(iv), Section 3.11(a)(vii), Section 3.11(a)(viii) and Section 4.04(b) prior to the remittance to the Trust Fund, but instead the Master Servicer shall include such amounts in the applicable remittance to the Trustee made pursuant to Section 3.10(a). The Trustee is hereby authorized to pay to the Advancing Person, reimbursements for Advances and Servicing Advances from the Distribution Account to the same extent the Master Servicer would have been permitted to reimburse itself for such Advances and/or Servicing Advances in accordance with Section 3.11(a)(ii), Section 3.11(a)(iii), Section 3.11(a)(vi), Section 3.11(a)(vii), Section 3.11(a)(viii) or Section 4.04(b), as the case may be, had the Master Servicer itself funded such Advance or Servicing Advance. The Trustee is hereby authorized to pay directly to the Advancing Person such portion of the Servicing Fee as the parties to any advance facility agree.

(c) All Advances and Servicing Advances made pursuant to the terms of this Agreement shall be deemed made and shall be reimbursed on a “first in-first out” (FIFO) basis.

(d) Any amendment to this Section 3.29 or to any other provision of this Agreement that may be necessary or appropriate to effect the terms of an Advance Facility as described generally in this Section 3.29, including amendments to add provisions relating to a successor master servicer, may be entered into by the Trustee and the Master Servicer without the consent of any Certificateholder but with the consent of the NIMS Insurer, notwithstanding anything to the contrary in this Agreement.

Section 3.30.

PMI Policies; Claims under the PMI Policies.

Notwithstanding anything to the contrary elsewhere in this Article III, the Master Servicer shall not agree to any modification or assumption of a PMI Mortgage Loan or take any other action with respect to a PMI Mortgage Loan that could result in denial of coverage under either PMI Policy. The Master Servicer shall notify the PMI Insurer that the Trustee, on behalf of the Certificateholders, is the Insured, as that term is defined in each PMI Policy, for each PMI Mortgage Loan. The Master Servicer shall, on behalf of the Trustee, prepare and file on a timely basis with the related PMI Insurer, with a copy to the Trustee, all claims which may be

made under the related PMI Policy with respect to the related PMI Mortgage Loans. Consistent with all rights and obligations hereunder, the Master Servicer shall take all actions required under each PMI Policy as a condition to the payment of any such claim. Any amount received from any PMI Insurer with respect to any such related PMI Mortgage Loan shall be deposited by the Master Servicer, no later than two Business Days following receipt thereof, into the Collection Account. The Trustee shall withdraw from the Distribution Account on each Distribution Date and pay to the related PMI Insurer the related PMI Insurer Fee in accordance with the terms of the related PMI Policy.

ARTICLE IV

PAYMENTS TO CERTIFICATEHOLDERS

Section 4.01.

Distributions.

(a)(1) On each Distribution Date, the following amounts, in the following order of priority, shall be distributed by REMIC I to REMIC II on account of the REMIC I Regular Interests or withdrawn from the Distribution Account and distributed to the holders of the Class R Certificates (in respect of the Class R-I Interest), as the case may be:

(i) (a) to Holders of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10, REMIC I Regular Interest I-LTM11, REMIC I Regular Interest I-LTZZ and REMIC I Regular Interest I-LTP, pro rata, in an amount equal to (A) the Uncertificated Interest for such Distribution Date, plus (B) any amounts in respect thereof remaining unpaid from previous Distribution Dates. Amounts payable as Uncertificated Interest in respect of REMIC I Regular Interest I-LTZZ shall be reduced and deferred when the REMIC I Overcollateralized Amount is less than the REMIC I Required Overcollateralization Amount, by the lesser of (x) the amount of such difference and (y) the Maximum I-LTZZ Uncertificated Interest Deferral Amount and such amount will be payable to the Holders of REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10 and REMIC I Regular Interest I-LTM11 in the same proportion as the Overcollateralization Deficiency Amount is allocated to the Corresponding Certificates and the Uncertificated Balance of REMIC I Regular Interest I-LTZZ shall be increased by such amount; and

(b) to Holders of REMIC I Regular Interest I-LT1SUB, REMIC I Regular Interest I-LT1GRP, REMIC I Regular Interest I-LT2SUB, REMIC I Regular Interest I-LT2GRP and REMIC I Regular Interest I-LTXX, pro rata, in an amount equal to (A) the Uncertificated Interest for such Distribution Date, plus (B) any amounts in respect thereof remaining unpaid from previous Distribution Dates;

(ii) second, to the Holders of REMIC I Regular Interests, in an amount equal to the remainder of the REMIC I Marker Allocation Percentage of Available Funds for such Distribution Date after the distributions made pursuant to clause (i) above, allocated as follows:

(a) 98.00% of such remainder (other than amounts payable under clause (c) below) to the Holders of REMIC I Regular Interest I-LTAA and REMIC I Regular Interest I-LTP, until the Uncertificated Balance of such REMIC I Regular Interest is reduced to zero, provided, however, that REMIC I Regular Interest I-LTP shall not be reduced until the Distribution Date immediately following the expiration of the latest Prepayment Charge as identified on the Prepayment Charge Schedule or any Distribution Date thereafter, at which point such amount shall be distributed to REMIC I Regular Interest I-LTP, until $100 has been distributed pursuant to this clause;

(b) 2.00% of such remainder (other than amounts payable under clause (c) below), first, to the Holders of REMIC I Regular Interest I-LTA1, REMIC I Regular Interest I-LTA2, REMIC I Regular Interest I-LTA3, REMIC I Regular Interest I-LTA4, REMIC I Regular Interest I-LTA5, REMIC I Regular Interest I-LTM1, REMIC I Regular Interest I-LTM2, REMIC I Regular Interest I-LTM3, REMIC I Regular Interest I-LTM4, REMIC I Regular Interest I-LTM5, REMIC I Regular Interest I-LTM6, REMIC I Regular Interest I-LTM7, REMIC I Regular Interest I-LTM8, REMIC I Regular Interest I-LTM9, REMIC I Regular Interest I-LTM10 and REMIC I Regular Interest I-LTM11, 1.00% of and in the same proportion as principal payments are allocated to the Corresponding Certificates, until the Uncertificated Balances of such REMIC I Regular Interests are reduced to zero and second, to the Holders of REMIC I Regular Interest I-LTZZ until the Uncertificated Balance of such REMIC I Regular Interest is reduced to zero; then

provided, however, that (i) 98.00% and (ii) 2.00% of any principal payments that are attributable to an Overcollateralization Release Amount shall be allocated to Holders of (i) REMIC I Regular Interest I-LTAA and REMIC I Regular Interest I-LTP, in that order and (ii) REMIC I Regular Interest I-LTZZ, respectively; provided that REMIC I Regular Interest I-LTP shall not be reduced until the Distribution Date immediately following the expiration of the latest Prepayment Charge as identified on the Prepayment Charge Schedule or any Distribution Date thereafter, at which point such amount shall be distributed to REMIC I Regular Interest I-LTP, until $100 has been distributed pursuant to this clause.

On each Distribution Date, all amounts representing Prepayment Charges in respect of the Mortgage Loans received during the related Prepayment Period and any Master Servicer Prepayment Charge Payment Amount paid by the Master Servicer during the related Prepayment Period will be distributed by REMIC I to the Holders of REMIC I Regular Interest I-LTP. The payment of the foregoing amounts to the Holders of REMIC I Regular Interest I-LTP shall not reduce the Uncertificated Balance thereof.

(iii) to the Holders of REMIC I Regular Interests, in an amount equal to the remainder of the REMIC I Sub WAC Allocation Percentage of Available Funds for such Distribution Date after the distributions made pursuant to clause (i) above, allocated so that:

distributions of principal shall be deemed to be made to the REMIC I Regular Interests first, so as to keep the Uncertificated Balance of each REMIC I Regular Interest ending with the designation “GRP” equal to 0.01% of the aggregate Stated Principal Balance of the Mortgage Loans in the related Loan Group; second, to each REMIC I Regular Interest ending with the designation “SUB,” so that the Uncertificated Balance of each such REMIC I Regular Interest is equal to 0.01% of the excess of (x) the aggregate Stated Principal Balance of the Mortgage Loans in the related Loan Group over (y) the Certificate Principal Balance of the Class A Certificate in the related Loan Group (except that if any such excess is a larger number than in the preceding distribution period, the least amount of principal shall be distributed to such REMIC I Regular Interests such that the REMIC I Subordinated Balance Ratio is maintained); and third, any remaining principal to REMIC I Regular Interest I-LTXX.

(2)(I) On each Distribution Date, the Trustee shall withdraw from the Distribution Account that portion of Available Funds for such Distribution Date consisting of the Group I Interest Remittance Amount for such Distribution Date, and make the following distributions in the order of priority described below, in each case to the extent of the Group I Interest Remittance Amount remaining for such Distribution Date:

(i) concurrently, to the Holders of each Class of Group I Certificates on a pro rata basis based on the entitlement of each such class, the related Monthly Interest Distributable Amount and the related Unpaid Interest Shortfall Amount, if any, for such Certificates for such Distribution Date; and

(ii) concurrently, to the Holders of each Class of Group II Certificates on a pro rata basis based on the entitlement of each such class, an amount equal to the excess, if any, of (x) the amount required to be distributed pursuant to Section 4.01(a)(2)(II)(i) below for such Distribution Date over (y) the amount actually distributed pursuant to such section from the Group II Interest Remittance Amount.

(II) On each Distribution Date the Trustee shall withdraw from the Distribution Account that portion of Available Funds for such Distribution Date consisting of the Group II Interest Remittance Amount for such Distribution Date, and make the following distributions in the order of priority described below, in each case to the extent of the Group II Interest Remittance Amount remaining for such Distribution Date:

(i) concurrently, to the Holders of each Class of Group II Certificates on a pro rata basis based on the entitlement of each such class, related the Monthly Interest Distributable Amount and the related Unpaid Interest Shortfall Amount, if any, for such Certificates for such Distribution Date; and

(ii) concurrently, to the Holders of each Class of Group I Certificates on a pro rata basis based on the entitlement of each such class, an amount equal to the excess, if any, of (x) the amount required to be distributed pursuant to Section 4.01(a)(2)(I)(i) above for such Distribution Date over (y) the amount actually distributed pursuant to such section from the Group I Interest Remittance Amount.

(III) On each Distribution Date, following the distributions made pursuant to Section 4.01(a)(2)(I) and (II) above, the Trustee shall make the following distributions in the order of priority described below, in each case to the extent of the sum of the Group I Interest Remittance Amount and the Group II Interest Remittance Amount remaining undistributed for such Distribution Date:

(i) to the Holders of the Class M-1 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(ii) to the Holders of the Class M-2 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(iii) to the Holders of the Class M-3 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(iv) to the Holders of the Class M-4 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(v) to the Holders of the Class M-5 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(vi) to the Holders of the Class M-6 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(vii) to the Holders of the Class M-7 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(viii) to the Holders of the Class M-8 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(ix) to the Holders of the Class M-9 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates;

(x) to the Holders of the Class M-10 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates; and

(xi) to the Holders of the Class M-11 Certificates, the Monthly Interest Distributable Amount allocable to such Certificates.

(3)(I) On each Distribution Date (a) prior to the Stepdown Date or (b) on which a Trigger Event is in effect, distributions in respect of principal to the extent of the Group I Principal Distribution Amount shall be made in the following amounts and order of priority:

(i) to the Holders of the Group I Certificates (allocated among the Group I Certificates in the priority described below), until the Certificate Principal Balance thereof has been reduced to zero; and

(ii) to the holders of the Group II Certificates (allocated among the Group II Certificates in the priority described below) after taking into account the distribution of the Group II Principal Distribution Amount already distributed as described in Section 4.01(a)(3)(II)(i) below, until the Certificate Principal Balance of such class has been reduced to zero.

(II) On each Distribution Date (a) prior to the Stepdown Date or (b) on which a Trigger Event is in effect, distributions in respect of principal to the extent of the Group II Principal Distribution Amount shall be made in the following amounts and order of priority:

(i) to the Holders of the Group II Certificates (allocated among the Group II Certificates in the priority described below), until the Certificate Principal Balance thereof has been reduced to zero; and

(ii) to the holders of the Group I Certificates (allocated among the Group I Certificates in the priority described below), after taking into account the distribution of the Group I Principal Distribution Amount already distributed as described in Section 4.01(a)(3)(I)(i) above, until the Certificate Principal Balance of such class has been reduced to zero.

(III) On each Distribution Date (a) prior to the Stepdown Date or (b) on which a Trigger Event is in effect, distributions in respect of principal to the extent of the sum of the Group I Principal Distribution Amount and the Group II Principal Distribution Amount remaining undistributed for such Distribution Date shall be made in the following amounts and order of priority:

(i) to the Holders of the Class M-1 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(ii) to the Holders of the Class M-2 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(iii) to the Holders of the Class M-3 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(iv) to the Holders of the Class M-4 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(v) to the Holders of the Class M-5 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(vi) to the Holders of the Class M-6 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(vii) to the Holders of the Class M-7 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(viii) to the Holders of the Class M-8 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(ix) to the Holders of the Class M-9 Certificates, until the Certificate Principal Balance thereof has been reduced to zero;

(x) to the Holders of the Class M-10 Certificates, until the Certificate Principal Balance thereof has been reduced to zero; and

(xi) to the Holders of the Class M-11 Certificates, until the Certificate Principal Balance thereof has been reduced to zero.

(IV) On each Distribution Date (a) on or after the Stepdown Date and (b) on which a Trigger Event is not in effect, distributions in respect of principal to the extent of the Group I Principal Distribution Amount shall be made in the following amounts and order of priority:

(i) to the Holders of the Group I Certificates (allocated among the Group II Certificates in the priority described below), the Group I Senior Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero; and

(ii) to the Holders of the Group II Certificates (allocated among the Group II Certificates in the priority described below), after taking into account the distribution of the Group II Principal Distribution Amount as described in Section 4.01(a)(3)(V)(i) below, up to an amount equal to the Group II Senior Principal Distribution Amount remaining undistributed, until the Certificate Principal Balance of each such class has been reduced to zero.

(V) On each Distribution Date (a) on or after the Stepdown Date and (b) on which a Trigger Event is not in effect, distributions in respect of principal to the extent of the Group II Principal Distribution Amount shall be made in the following amounts and order of priority:

(i) to the Holders of the Group II Certificates (allocated among the Group II Certificates in the priority described below), the Group II Senior Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero; and

(ii) to the holders of the Group I Certificates (allocated among the Group I Certificates in the priority described below), after taking into account the distribution of the Group I Principal Distribution Amount, as described in Section 4.01(a)(3)(IV)(i) above, up to an amount equal to the Group I Senior Principal Distribution Amount remaining undistributed, until the Certificate Principal Balance of each such class has been reduced to zero.

(VI) On each Distribution Date (a) on or after the Stepdown Date and (b) on which a Trigger Event is not in effect, distributions in respect of principal to the extent of the sum of the Group I Principal Distribution Amount and the Group II Principal Distribution

Amount remaining undistributed for such Distribution Date shall be made in the following amounts and order of priority:

(i) to the Holders of the Class M-1 Certificates, the Class M-1 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(ii) to the Holders of the Class M-2 Certificates, the Class M-2 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(iii) to the Holders of the Class M-3 Certificates, the Class M-3 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(iv) to the Holders of the Class M-4 Certificates, the Class M-4 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(v) to the Holders of the Class M-5 Certificates, the Class M-5 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(vi) to the Holders of the Class M-6 Certificates, the Class M-6 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(vii) to the Holders of the Class M-7 Certificates, the Class M-7 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(viii) to the Holders of the Class M-8 Certificates, the Class M-8 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(ix) to the Holders of the Class M-9 Certificates, the Class M-9 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero;

(x) to the Holders of the Class M-10 Certificates, the Class M-10 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero; and

(xi) to the Holders of the Class M-11 Certificates, the Class M-11 Principal Distribution Amount until the Certificate Principal Balance thereof has been reduced to zero.

With respect to the Group I Certificates, all principal distributions will be distributed on a pro rata basis based on the Certificate Principal Balance of each such class, with the exception that if a Sequential Trigger Event is in effect, principal distributions will be allocated sequentially to the Class A-1 Certificates and Class A-2 Certificates, in that order, until their respective Certificate Principal Balances have been reduced to zero.

With respect to the Group II Certificates, all principal distributions will be distributed sequentially, to the Class A-3 Certificates, Class A-4 Certificates and Class A-5 Certificates, in that order, until their respective Certificate Principal Balances have been reduced to zero.

Notwithstanding anything contained herein to the contrary, on any Distribution Date on which the aggregate Certificate Principal Balance of the Class A Certificates, the Mezzanine Certificates and the Class CE Certificates has been reduced to zero, all distributions of principal to the Group I Certificates or Group II Certificates, as applicable, will be distributed on a pro rata basis based on the Certificate Principal Balance of each such class.

(4) On each Distribution Date, the Net Monthly Excess Cashflow shall be distributed as follows:

(i) to the Holders of the Class or Classes of Certificates then entitled to receive distributions in respect of principal, in an amount equal to any Extra Principal Distribution Amount, distributable to such Holders as part of the Group I Principal Distribution Amount and/or the Group II Principal Distribution Amount as described under Section 4.01(a)(3) above;

(ii) to the Holders of the Class M-1 Certificates, in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(iii) to the Holders of the Class M-1 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(iv) to the Holders of the Class M-2 Certificates, in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(v) to the Holders of the Class M-2 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(vi) to the Holders of the Class M-3 Certificates, in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(vii) to the Holders of the Class M-3 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(viii) to the Holders of the Class M-4 Certificates, in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(ix) to the Holders of the Class M-4 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(x) to the Holders of the Class M-5 Certificates in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(xi) to the Holders of the Class M-5 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(xii) to the Holders of the Class M-6 Certificates in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(xiii) to the Holders of the Class M-6 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(xiv) to the Holders of the Class M-7 Certificates in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(xv) to the Holders of the Class M-7 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(xvi) to the Holders of the Class M-8 Certificates in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(xvii) to the Holders of the Class M-8 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(xviii) to the Holders of the Class M-9 Certificates in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(xix) to the Holders of the Class M-9 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(xx) to the Holders of the Class M-10 Certificates in an amount equal to the Unpaid Interest Shortfall Amount allocable to such Certificates;

(xxi) to the Holders of the Class M-10 Certificates, in an amount equal to the Allocated Realized Loss Amount allocable to such Certificates;

(xxii) to the Net WAC Rate Carryover Reserve Account, the amount of any Net WAC Rate Carryover Amount and any other amounts required by Section 3.28, after taking into account amounts received under the Cap Contracts;

(xxiii) to the Holders of the Class CE Certificates, the Monthly Interest Distributable Amount for such Class and any remaining Overcollateralization Release Amount for such Distribution Date;

(xxiv) if such Distribution Date follows the Prepayment Period during which occurs the latest date on which a Prepayment Charge may be required to be paid in respect of any Mortgage Loans, to the Holders of the Class P Certificates, in reduction of

the Certificate Principal Balance thereof, until the Certificate Principal Balance thereof is reduced to zero; and

(xxv) any remaining amounts to the Holders of the Residual Certificates (in respect of the appropriate Class R Interest).

Following the foregoing distributions, an amount equal to the amount of Subsequent Recoveries deposited into the Collection Account pursuant to Section 3.10 shall be applied to increase the Certificate Principal Balance of the Class of Certificates with the Highest Priority up to the extent of such Realized Losses previously allocated to that Class of Certificates pursuant to Section 4.04. An amount equal to the amount of any remaining Subsequent Recoveries shall be applied to increase the Certificate Principal Balance of the Class of Certificates with the next Highest Priority, up to the amount of such Realized Losses previously allocated to that Class of Certificates pursuant to Section 4.04. Holders of such Certificates will not be entitled to any distribution in respect of interest on the amount of such increases for any Accrual Period preceding the Distribution Date on which such increase occurs. Any such increases shall be applied to the Certificate Principal Balance of each Certificate of such Class in accordance with its respective Percentage Interest.

Without limiting the provisions of Section 9.01(b), by acceptance of the Residual Certificates the Holders of the Residual Certificates agree, and it is the understanding of the parties hereto, that for so long as any of the notes issued pursuant to the Indenture are outstanding or any amounts are reimbursable or payable to the NIMS Insurer in accordance with the terms of the Indenture, to pledge their rights to receive any amounts otherwise distributable to the Holders of the Class R Certificates (and such rights are hereby assigned and transferred) to the Holders of the Class CE Certificates.

(b) On each Distribution Date, after making the distributions of the Available Funds as set forth above, the Trustee will first, withdraw from the Net WAC Rate Carryover Reserve Account all income from the investment of funds in the Net WAC Rate Carryover Reserve Account and distribute such amount to the Holders of the Class CE Certificates, and second, withdraw from the Net WAC Rate Carryover Reserve Account, to the extent of amounts remaining on deposit therein, the amount of any Net WAC Rate Carryover Amount for such Distribution Date and distribute such amount in the following order of priority:

(A) concurrently, to the Group I Certificates on a pro rata basis based on the Net WAC Rate Carryover Amount for each such class, the related Net WAC Rate Carryover Amount for such Class, but only to the extent of amounts paid under the Group I Cap Contract;

(B) concurrently, to the Group II Certificates on a pro rata basis based on the Net WAC Rate Carryover Amount for each such class, the related Net WAC Rate Carryover Amount for such Class, but only to the extent of amounts paid under the Group II Cap Contract;

(C) concurrently, to the Mezzanine Certificates, on a pro rata basis based on the Net WAC Rate Carryover Amount for each such Class, but only to the extent of amounts paid under the Mezzanine Cap Contract;

(D) to the Class A Certificates and the Mezzanine Certificates, any related unpaid Net WAC Rate Carryover Amount (after taking into account distributions pursuant to (A), (B) and (C) above), distributed in the following order of priority:

(i) to the Class A Certificates, on a pro rata basis based on the remaining Net WAC Rate Carryover Amount for each such Class;

(ii)	to the Class M-1 Certificates;
(iii)	to the Class M-2 Certificates;
(iv)	to the Class M-3 Certificates;
(v)	to the Class M-4 Certificates;
(vi)	to the Class M-5 Certificates;
(vii)	to the Class M-6 Certificates;
(viii)	to the Class M-7 Certificates;
(ix)	to the Class M-8 Certificates;
(x)	to the Class M-9 Certificates; and
(xi)	to the Class M-10 Certificates.

On each Distribution Date, the Trustee shall withdraw any amounts then on deposit in the Distribution Account that represent (i) Prepayment Charges collected by the Master Servicer in connection with the Principal Prepayment of any of the Mortgage Loans or (ii) any Master Servicer Prepayment Charge Payment Amount, and shall distribute such amounts to the Holders of the Class P Certificates. Such distributions shall not be applied to reduce the Certificate Principal Balance of the Class P Certificates.

(c) All distributions made with respect to each Class of Certificates on each Distribution Date shall be allocated pro rata among the outstanding Certificates in such Class based on their respective Percentage Interests. Distributions in respect of each Class of Certificates on each Distribution Date will be made to the Holders of the respective Class of record on the related Record Date (except as otherwise provided in Section 4.01(e) or Section 9.01 respecting the final distribution on such Class), based on the aggregate Percentage Interest represented by their respective Certificates, and shall be made by wire transfer of immediately available funds to the account of any such Holder at a bank or other entity having appropriate facilities therefor, if such Holder shall have so notified the Trustee in writing at least five Business Days prior to the Record Date immediately prior to such Distribution Date and is the registered owner of Certificates having an initial aggregate Certificate Principal Balance or Notional Amount that is in excess of the lesser of (i) $5,000,000 or (ii) two-thirds of the initial Certificate Principal Balance or Notional Amount of such Class of Certificates, or otherwise by check mailed by first class mail to the address of such Holder appearing in the Certificate

Register. The final distribution on each Certificate will be made in like manner, but only upon presentment and surrender of such Certificate at the Corporate Trust Office of the Trustee or such other location specified in the notice to Certificateholders of such final distribution.

Each distribution with respect to a Book-Entry Certificate shall be paid to the Depository, as Holder thereof, and the Depository shall be responsible for crediting the amount of such distribution to the accounts of its Depository Participants in accordance with its normal procedures. Each Depository Participant shall be responsible for disbursing such distribution to the Certificate Owners that it represents and to each indirect participating brokerage firm (a “brokerage firm” or “indirect participating firm”) for which it acts as agent. Each brokerage firm shall be responsible for disbursing funds to the Certificate Owners that it represents. None of the Trustee, the Depositor or the Master Servicer shall have any responsibility therefor except as otherwise provided by this Agreement or applicable law.

(d) The rights of the Certificateholders to receive distributions in respect of the Certificates, and all interests of the Certificateholders in such distributions, shall be as set forth in this Agreement. None of the Holders of any Class of Certificates, the Trustee or the Master Servicer shall in any way be responsible or liable to the Holders of any other Class of Certificates in respect of amounts properly previously distributed on the Certificates.

(e) Except as otherwise provided in Section 9.01, whenever the Trustee expects that the final distribution with respect to any Class of Certificates will be made on the next Distribution Date, the Trustee shall, no later than three (3) days before the related Distribution Date, mail to each Holder on such date of such Class of Certificates a notice to the effect that:

(i) the Trustee expects that the final distribution with respect to such Class of Certificates will be made on such Distribution Date but only upon presentation and surrender of such Certificates at the office of the Trustee therein specified, and

(ii) no interest shall accrue on such Certificates from and after the end of the related Accrual Period.

Any funds not distributed to any Holder or Holders of Certificates of such Class on such Distribution Date because of the failure of such Holder or Holders to tender their Certificates shall, on such date, be set aside and held in trust by the Trustee and credited to the account of the appropriate non-tendering Holder or Holders. If any Certificates as to which notice has been given pursuant to this Section 4.01(e) shall not have been surrendered for cancellation within six months after the time specified in such notice, the Trustee shall mail a second notice to the remaining non-tendering Certificateholders to surrender their Certificates for cancellation in order to receive the final distribution with respect thereto. If within one year after the second notice all such Certificates shall not have been surrendered for cancellation, the Trustee shall, directly or through an agent, mail a final notice to the remaining non-tendering Certificateholders concerning surrender of their Certificates but shall continue to hold any remaining funds for the benefit of non-tendering Certificateholders. The costs and expenses of maintaining the funds in trust and of contacting such Certificateholders shall be paid out of the assets remaining in the Trust Fund. If within one year after the final notice any such Certificates

shall not have been surrendered for cancellation, the Trustee shall pay to UBS Securities LLC all such amounts, and all rights of non-tendering Certificateholders in or to such amounts shall thereupon cease. No interest shall accrue or be payable to any Certificateholder on any amount held in trust by the Trustee as a result of such Certificateholder’s failure to surrender its Certificate(s) for final payment thereof in accordance with this Section 4.01(e). Any such amounts held in trust by the Trustee shall be held in an Eligible Account and the Trustee may direct any depository institution maintaining such account to invest the funds in one or more Permitted Investments. All income and gain realized from the investment of funds deposited in such accounts held in trust by the Trustee shall be for the benefit of the Trustee; provided, however, that the Trustee shall deposit in such account the amount of any loss of principal incurred in respect of any such Permitted Investment made with funds in such accounts immediately upon the realization of such loss.

(f) Notwithstanding anything to the contrary herein, (i) in no event shall the Certificate Principal Balance of a Class A Certificate or a Mezzanine Certificate be reduced more than once in respect of any particular amount both (a) allocated to such Certificate in respect of Realized Losses pursuant to Section 4.04 and (b) distributed to the Holder of such Certificate in reduction of the Certificate Principal Balance thereof pursuant to this Section 4.01 from Net Monthly Excess Cashflow and (ii) in no event shall the Uncertificated Balance of a REMIC I Regular Interest be reduced more than once in respect of any particular amount both (a) allocated to such REMIC I Regular Interest in respect of Realized Losses pursuant to Section 4.04 and (b) distributed on such REMIC I Regular Interest in reduction of the Uncertificated Balance thereof pursuant to this Section 4.01.

Section 4.02.

Statements to Certificateholders.

On each Distribution Date, the Trustee shall prepare and make available to each Holder of the Regular Certificates and the NIMS Insurer, a statement as to the distributions made on such Distribution Date setting forth:

(i) the amount of the distribution made on such Distribution Date to the Holders of the Certificates of each Class allocable to principal, and the amount of the distribution made on such Distribution Date to the Holders of the Class P Certificates allocable to Prepayment Charges and Master Servicer Prepayment Charge Payment Amounts;

(ii) the amount of the distribution made on such Distribution Date to the Holders of the Certificates of each Class allocable to interest;

(iii) the aggregate Servicing Fee received by the Master Servicer during the related Due Period and such other customary information as the Trustee deems necessary or desirable, or which a Certificateholder reasonably requests, to enable Certificateholders to prepare their tax returns;

(iv)	the aggregate amount of Advances for such Distribution Date;

(v) the aggregate Stated Principal Balance of the Mortgage Loans and any REO Properties as of the close of business on such Distribution Date;

(vi) the number, aggregate Principal Balance, weighted average remaining term to maturity and weighted average Mortgage Rate of the Mortgage Loans as of the related Due Date;

(vii) the number and aggregate unpaid principal balance of Mortgage Loans (a) delinquent 30 to 59 days, (b) delinquent 60 to 89 days, (c) delinquent 90 or more days, in each case, as of the last day of the preceding calendar month, (d) as to which foreclosure proceedings have been commenced and (e) with respect to which the related Mortgagor has filed for protection under applicable bankruptcy laws, with respect to whom bankruptcy proceedings are pending or with respect to whom bankruptcy protection is in force;

(viii) the total number and cumulative principal balance of all REO Properties as of the close of business on the last day of the preceding Prepayment Period;

(ix)	[reserved];

(x) the aggregate amount of Principal Prepayments made during the related Prepayment Period;

(xi) the aggregate amount of Realized Losses incurred during the related Prepayment Period, the cumulative amount of Realized Losses and the aggregate amount of Subsequent Recoveries received during the related Prepayment Period and the cumulative amount of Subsequent Recoveries received since the Closing Date;

(xii) the aggregate amount of Extraordinary Trust Fund Expenses withdrawn from the Collection Account or the Distribution Account for such Distribution Date;

(xiii) the aggregate Certificate Principal Balance and Notional Amount, as applicable, of each Class of Certificates, after giving effect to the distributions, and allocations of Realized Losses, made on such Distribution Date, separately identifying any reduction thereof due to allocations of Realized Losses;

(xiv) the Certificate Factor for each such Class of Certificates applicable to such Distribution Date;

(xv) the Monthly Interest Distributable Amount in respect of the Class A Certificates, the Mezzanine Certificates and the Class CE Certificates for such Distribution Date and the Unpaid Interest Shortfall Amount, if any, with respect to the Class A Certificates and the Mezzanine Certificates on such Distribution Date, separately identifying any reduction thereof due to allocations of Realized Losses, Prepayment Interest Shortfalls and Relief Act Interest Shortfalls;

(xvi) the aggregate amount of any Prepayment Interest Shortfall for such Distribution Date, to the extent not covered by payments by the Master Servicer pursuant to Section 3.24;

(xvii) the aggregate amount of Relief Act Interest Shortfalls for such Distribution Date;

(xviii) the Overcollateralization Target Amount, Overcollateralized Amount and Overcollateralization Deficiency Amount and the Credit Enhancement Percentage for such Distribution Date;

(xix) the respective Pass-Through Rates applicable to the Class A Certificates, the Mezzanine Certificates and the Class CE Certificates for such Distribution Date and the Pass-Through Rate applicable to the Class A Certificates and the Mezzanine Certificates for the immediately succeeding Distribution Date;

(xx)	[reserved];
(xxi)	the Aggregate Loss Severity Percentage;
(xxii)	when the Stepdown Date or Trigger Event has occurred;
(xxiii)	the Available Funds;

(xxiv) the Net WAC Rate Carryover Amount for the Class A Certificates and the Mezzanine Certificates, if any, for such Distribution Date, the amount remaining unpaid after reimbursements therefor on such Distribution Date and any amounts received under the Cap Contracts;

(xxv) (A) the amount of payments received related to claims under each PMI Policy during the related Prepayment Period (and the number of Mortgage Loans to which such payments related) and (B) the cumulative amount of payments received related to claims under each PMI Policy since the Closing Date (and the number of Mortgage Loans to which such payments related); and

(xxvi) (A) the dollar amount of claims made under each PMI Policy that were denied during the Prepayment Period (and the number of Mortgage Loans to which such denials related) and (B) the dollar amount of the cumulative claims made under each PMI Policy that were denied since the Closing Date (and the number of Mortgage Loans to which such denials related).

The Trustee will make such statement (and, at its option, any additional files containing the same information in an alternative format) available each month to Certificateholders, the NIMS Insurer and the Rating Agencies via the Trustee’s internet website, which shall initially be located at “www.ctslink.com”. Assistance in using the website can be obtained by calling the Trustee’s customer service desk at (301) 815-6600. Parties that are unable to use the above distribution option are entitled to have a paper copy mailed to them via

first class mail by calling the customer service desk and indicating such. The Trustee shall have the right to change the way such statements are distributed in order to make such distribution more convenient and/or more accessible to the above parties and the Trustee shall provide timely and adequate notification to all above parties regarding any such changes. As a condition to access the Trustee’s internet website, the Trustee may require registration and the acceptance of a disclaimer. The Trustee will not be liable for the dissemination of information in accordance with this Agreement. The Trustee shall also be entitled to rely on but shall not be responsible for the content or accuracy of any information provided by third parties for purposes of preparing the distribution date statement and may affix thereto any disclaimer it deems appropriate in its reasonable discretion (without suggesting liability on the part of any other party thereto).

In the case of information furnished pursuant to subclauses (i) through (iii) above, the amounts shall be expressed as a dollar amount per Single Certificate of the relevant Class.

Within a reasonable period of time after the end of each calendar year, the Trustee shall, upon written request, furnish to each Person who at any time during the calendar year was a Holder of a Regular Certificate and the NIMS Insurer a statement containing the information set forth in subclauses (i) through (iii) above, aggregated for such calendar year or applicable portion thereof during which such person was a Certificateholder. Such obligation of the Trustee shall be deemed to have been satisfied to the extent that substantially comparable information shall be provided by the Trustee pursuant to any requirements of the Code as from time to time are in force.

On each Distribution Date, the Trustee shall forward to the Depositor, the NIMS Insurer, the Trustee, to each Holder of a Residual Certificate and to the Master Servicer, a copy of the reports forwarded to the Regular Certificateholders on such Distribution Date and a statement setting forth the amounts, if any, actually distributed with respect to the Residual Certificates, respectively, on such Distribution Date.

Within a reasonable period of time after the end of each calendar year, the Trustee shall furnish to each Person who at any time during the calendar year was a Holder of a Residual Certificate and the NIMS Insurer a statement setting forth the amount, if any, actually distributed with respect to the Residual Certificates, as appropriate, aggregated for such calendar year or applicable portion thereof during which such Person was a Certificateholder.

The Trustee shall, upon request, furnish to each Certificateholder and the NIMS Insurer, during the term of this Agreement, such periodic, special, or other reports or information, whether or not provided for herein, as shall be reasonable with respect to the Certificateholder, or otherwise with respect to the purposes of this Agreement, all such reports or information to be provided at the expense of the Certificateholder in accordance with such reasonable and explicit instructions and directions as the Certificateholder may provide. For purposes of this Section 4.02, the Trustee’s duties are limited to the extent that the Trustee receives timely reports as required from the Master Servicer.

On each Distribution Date the Trustee shall provide Bloomberg Financial Markets, L.P. (“Bloomberg”) CUSIP level factors for each class of Certificates as of such Distribution Date, using a format and media mutually acceptable to the Trustee and Bloomberg.

Section 4.03.

Remittance Reports; Advances.

(a) On the third Business Day following each Determination Date but in no event later than the earlier of (i) such date which would allow the indenture trustee to submit a claim to the NIMS Insurer under the Indenture so as to allow a timely payment by the NIMS Insurer under the insurance policy related to the notes insured by the NIMS Insurer and (ii) the 20^th day of each month (or if such 20^th day is not a Business Day, the preceding Business Day), the Master Servicer shall deliver to the Trustee and the NIMS Insurer by telecopy or electronic mail (or by such other means as the Master Servicer and the Trustee may agree from time to time) a Remittance Report with respect to the related Distribution Date. On the same date, the Master Servicer shall forward to the Trustee by overnight mail a computer readable magnetic tape or electronically transmit (in a format acceptable to the Trustee) a data file containing the information set forth in such Remittance Report with respect to the related Distribution Date. Such Remittance Report will include (i) the amount of Advances to be made by the Master Servicer in respect of the related Distribution Date, the aggregate amount of Advances outstanding after giving effect to such Advances, and the aggregate amount of Nonrecoverable Advances in respect of such Distribution Date and (ii) such other information with respect to the Mortgage Loans as the Trustee may reasonably require to perform the calculations necessary to make the distributions contemplated by Section 4.01 and to prepare the statements to Certificateholders contemplated by Section 4.02. The Trustee shall not be responsible to recompute, recalculate or verify any information provided to it by the Master Servicer.

(b) The amount of Advances to be made by the Master Servicer for any Distribution Date shall equal, subject to Section 4.03(d), the sum of (i) the aggregate amount of Monthly Payments (with each interest portion thereof net of the related Servicing Fee), due on the related Due Date in respect of the Mortgage Loans, which Monthly Payments were delinquent as of the close of business on the related Determination Date and (ii) with respect to each REO Property, which REO Property was acquired during or prior to the related Prepayment Period and as to which REO Property an REO Disposition did not occur during the related Prepayment Period, an amount equal to the excess, if any, of the REO Imputed Interest on such REO Property for the most recently ended calendar month, over the net income from such REO Property transferred to the Distribution Account pursuant to Section 3.23 for distribution on such Distribution Date. For purposes of the preceding sentence, the Monthly Payment on each Balloon Mortgage Loan with a delinquent Balloon Payment is equal to the assumed monthly payment that would have been due on the related Due Date based on the original principal amortization schedule for the such Balloon Mortgage Loan.

By 1:00 p.m. New York time on the Master Servicer Remittance Date, the Master Servicer shall remit in immediately available funds to the Trustee for deposit in the Distribution Account an amount equal to the aggregate amount of Advances, if any, to be made in respect of the Mortgage Loans and REO Properties for the related Distribution Date either (i) from its own funds or (ii) from the Collection Account, to the extent of funds held therein for future distribution (in which case it will cause to be made an appropriate entry in the records of Collection Account that amounts held for future distribution have been, as permitted by this Section 4.03, used by the Master Servicer in discharge of any such Advance) or (iii) in the form of any combination of (i) and (ii) aggregating the total amount of Advances to be made by the Master Servicer with respect to the Mortgage Loans and REO Properties. Any amounts held for

future distribution and so used shall be appropriately reflected in the Master Servicer’s records and replaced by the Master Servicer by deposit in the Collection Account on or before any future Master Servicer Remittance Date to the extent that the Available Funds for the related Distribution Date (determined without regard to Advances to be made on the Master Servicer Remittance Date) shall be less than the total amount that would be distributed to the Certificateholders pursuant to Section 4.01 on such Distribution Date if such amounts held for future distributions had not been so used to make Advances. The Trustee will provide notice to the Master Servicer and the NIMS Insurer by telecopy by the close of business on the third Business Day prior to the Distribution Date in the event that the amount remitted by the Master Servicer to the Trustee on such date is less than the Advances required to be made by the Master Servicer for the related Distribution Date.

(c) The obligation of the Master Servicer to make such Advances is mandatory, notwithstanding any other provision of this Agreement but subject to (d) below, and, with respect to any Mortgage Loan or REO Property, shall continue until a Final Recovery Determination in connection therewith or the removal thereof from the Trust Fund pursuant to any applicable provision of this Agreement, except as otherwise provided in this Section.

(d) Notwithstanding anything herein to the contrary, no Advance or Servicing Advance shall be required to be made hereunder by the Master Servicer if such Advance or Servicing Advance would, if made, constitute a Nonrecoverable Advance or Nonrecoverable Servicing Advance, respectively. The determination by the Master Servicer that it has made a Nonrecoverable Advance or a Nonrecoverable Servicing Advance or that any proposed Advance or Servicing Advance, if made, would constitute a Nonrecoverable Advance or Nonrecoverable Servicing Advance, respectively, shall be evidenced by an Officers’ Certificate of the Master Servicer delivered to the Depositor, the NIMS Insurer and the Trustee.

Section 4.04.

Allocation of Realized Losses.

(a) Prior to each Determination Date, the Master Servicer shall determine as to each Mortgage Loan and REO Property: (i) the total amount of Realized Losses, if any, incurred in connection with any Final Recovery Determinations made during the related Prepayment Period; and (ii) the respective portions of such Realized Losses allocable to interest and allocable to principal. Prior to each Determination Date, the Master Servicer shall also determine as to each Mortgage Loan: (i) the total amount of Realized Losses, if any, incurred in connection with any Deficient Valuations made during the related Prepayment Period; and (ii) the total amount of Realized Losses, if any, incurred in connection with Debt Service Reductions in respect of Monthly Payments due during the related Due Period. The information described in the preceding sentence that is to be supplied by the Master Servicer shall be evidenced by an Officers’ Certificate delivered to the Trustee by the Master Servicer prior to the Determination Date immediately following the end of the Prepayment Period during which any such Realized Loss was incurred.

(b) All Realized Losses on the Mortgage Loans shall be allocated by the Trustee on each Distribution Date as follows: first, to Net Monthly Excess Cashflow; second, to the Class CE Certificates, until the Certificate Principal Balance thereof has been reduced to zero; third, to the Class M-10 Certificates, until the respective Certificate Principal Balance

thereof has been reduced to zero; fourth, to the Class M-9 Certificates, until the respective Certificate Principal Balance thereof has been reduced to zero; fifth, to the Class M-8 Certificates, until the respective Certificate Principal Balance thereof has been reduced to zero; sixth, to the Class M-7 Certificates, until the respective Certificate Principal Balance thereof has been reduced to zero; seventh, to the Class M-6 Certificates, until the respective Certificate Principal Balance thereof has been reduced to zero; eighth, to the Class M-5 Certificates, until the respective Certificate Principal Balance thereof has been reduced to zero; ninth, to the Class M-4 Certificates, until the Certificate Principal Balance thereof has been reduced to zero; tenth, to the Class M-3 Certificates, until the Certificate Principal Balance thereof has been reduced to zero; eleventh, to the Class M-2 Certificates, until the Certificate Principal Balance thereof has been reduced to zero; and twelfth, to the Class M-1 Certificates, until the Certificate Principal Balance thereof has been reduced to zero. All Realized Losses to be allocated to the Certificate Principal Balances of all Classes on any Distribution Date shall be so allocated after the actual distributions to be made on such date as provided above. All references above to the Certificate Principal Balance of any Class of Certificates shall be to the Certificate Principal Balance of such Class immediately prior to the relevant Distribution Date, before reduction thereof by any Realized Losses, in each case to be allocated to such Class of Certificates, on such Distribution Date.

Any allocation of Realized Losses to a Mezzanine Certificate on any Distribution Date shall be made by reducing the Certificate Principal Balance thereof by the amount so allocated; any allocation of Realized Losses to a Class CE Certificate shall be made by reducing the amount otherwise payable in respect thereof pursuant to Section 4.01(a)(4)(xvii). No allocations of any Realized Losses shall be made to the Certificate Principal Balances of the Class A Certificates or the Class P Certificates.

As used herein, an allocation of a Realized Loss on a “pro rata basis” among two or more specified Classes of Certificates means an allocation on a pro rata basis, among the various Classes so specified, to each such Class of Certificates on the basis of their then outstanding Certificate Principal Balances prior to giving effect to distributions to be made on such Distribution Date. All Realized Losses and all other losses allocated to a Class of Certificates hereunder will be allocated among the Certificates of such Class in proportion to the Percentage Interests evidenced thereby.

(c)(i) The REMIC I Marker Percentage of all Realized Losses on the Mortgage Loans shall be allocated by the Trustee on each Distribution Date to the following REMIC I Regular Interests in the specified percentages, as follows:

First, to Uncertificated Interest payable to the REMIC I Regular Interest I-LTAA and REMIC I Regular Interest I-LTZZ up to an aggregate amount equal to the REMIC I Interest Loss Allocation Amount, 98% and 2%, respectively;

Second, to the Uncertificated Balances of the REMIC I Regular Interest I-LTAA and REMIC I Regular Interest I-LTZZ up to an aggregate amount equal to the REMIC I Principal Loss Allocation Amount, 98% and 2%, respectively;

Third, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM11 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balances of REMIC I Regular Interest I-LTM10 has been reduced to zero;

Fourth, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM10 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balances of REMIC I Regular Interest I-LTM9 has been reduced to zero;

Fifth, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM9 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balances of REMIC I Regular Interest I-LTM10 has been reduced to zero;

Sixth, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM8 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balances of REMIC I Regular Interest I-LTM7 has been reduced to zero;

Seventh, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM7 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balances of REMIC I Regular Interest I-LTM7 has been reduced to zero;

Eighth, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM6 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balances of REMIC I Regular Interest I-LTM7 has been reduced to zero;

Ninth, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM5 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balances of REMIC I Regular Interest I-LTM5 has been reduced to zero;

Tenth, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM4 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balance of REMIC I Regular Interest I-LTM4 has been reduced to zero;

Eleventh, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM3 and REMIC I Regular Interest I-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balance of REMIC I Regular Interest I-LTM3 has been reduced to zero;

Twelfth, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM2 and REMIC I Regular Interest I-LTZZ, 98%,

1% and 1%, respectively, until the Uncertificated Balance of REMIC I Regular Interest I-LTM2 has been reduced to zero; and

Thirteenth, to the Uncertificated Balances of REMIC I Regular Interest I-LTAA, REMIC I Regular Interest I-LTM1 and REMIC I Regular Interest II-LTZZ, 98%, 1% and 1%, respectively, until the Uncertificated Balance of REMIC I Regular Interest I-LTM1 has been reduced to zero.

(ii) The REMIC I Sub WAC Allocation Percentage of all Realized Losses shall be applied after all distributions have been made on each Distribution Date first, so as to keep the Uncertificated Balance of each REMIC I Regular Interest ending with the designation “GRP” equal to 0.01% of the aggregate Stated Principal Balance of the Mortgage Loans in the related Loan Group; second, to each REMIC I Regular Interest ending with the designation “SUB,” so that the Uncertificated Balance of each such REMIC I Regular Interest is equal to 0.01% of the excess of (x) the aggregate Stated Principal Balance of the Mortgage Loans in the related Loan Group over (y) the Certificate Principal Balance of the Class A Certificate in the related Loan Group (except that if any such excess is a larger number than in the preceding distribution period, the least amount of Realized Losses shall be applied to such REMIC I Regular Interests such that the REMIC I Subordinated Balance Ratio is maintained); and third, any remaining Realized Losses shall be allocated to REMIC I Regular Interest I-LTXX.

Section 4.05.

Compliance with Withholding Requirements.

Notwithstanding any other provision of this Agreement, the Trustee shall comply with all federal withholding requirements respecting payments to Certificateholders of interest or original issue discount that the Trustee reasonably believes are applicable under the Code. The consent of Certificateholders shall not be required for such withholding. In the event the Trustee does withhold any amount from interest or original issue discount payments or advances thereof to any Certificateholder pursuant to federal withholding requirements, the Trustee shall indicate the amount withheld to such Certificateholders.

Section 4.06.

Exchange Commission; Additional Information.

(a) The Trustee and the Master Servicer shall reasonably cooperate with the Depositor in connection with satisfying the reporting requirements of the Trust Fund under the Exchange Act. The Trustee shall prepare and sign on behalf of the Trust Fund any Forms 8-K customary for similar securities as required by the Exchange Act and the Rules and Regulations of the Commission thereunder, and the Trustee shall file (via the Commission’s Electronic Data Gathering and Retrieval System) such forms on behalf of the Trust Fund. The Trustee shall prepare and the Master Servicer shall sign any Form 10-K in the form attached hereto as Exhibit H, which includes as exhibits (i) the Certification (as defined in (b) below), (ii) the Master Servicer’s annual statement of compliance described under Section 3.20 and (iii) the accountant’s report described under Section 3.21 and the Trustee shall file (via the Commission’s Electronic Data Gathering and Retrieval System) such forms on behalf of the Trust Fund. To the extent that the Commission requires any additional information to be filed pursuant to a Form 10-K, the Trustee shall prepare, the Master Servicer shall sign and the Trustee shall promptly file an amended Form 10-K containing such additional information. The Trustee shall subject to the

provisions of Sections 8.01 and 8.02 hereof, indemnify and hold harmless the Master Servicer and its officers, directors and Affiliates from and against any losses, damages, penalties, fines, forfeitures, reasonable and necessary legal fees and related costs, judgments and other costs and expenses arising out of or based upon third party claims relating to information included in any Form 10-K provided by the Trustee other than any losses, damages, penalties, fines, forfeitures, reasonable and necessary legal fees and related costs arising out of third party claims relating to information contained in the Certification, the Master Servicer’s annual statement of compliance described under Section 3.20 and the accountant’s report described under Section 3.21 which are included in such Form 10-K.

(b) Each Form 8-K shall be filed by the Trustee within 15 days after each Distribution Date with a copy of the Monthly Statement for such Distribution Date as an exhibit thereto. On or prior to March 31^st of each year, commencing in 2006 (or such earlier date as may be required by the Exchange Act and the Rules and Regulations of the Commission), the Trustee shall file a Form 10-K, in substance as required by applicable law or applicable Commission staff’s interpretations. Such Form 10-K shall include as exhibits the Master Servicer’s annual statement of compliance described under Section 3.20 and the accountant’s report described under Section 3.21, in each case to the extent they have been timely delivered to the Trustee. If they are not so timely delivered, the Trustee shall file an amended Form 10-K including such documents as exhibits reasonably promptly after they are delivered to the Trustee. The Trustee shall have no liability with respect to any failure to properly prepare or file such periodic reports resulting from or relating to (a) the Trustee’s inability or failure to obtain any information not resulting from its own negligence or willful misconduct or (b) any inaccuracy in such periodic reports resulting from incorrect information provided to the Trustee by the Master Servicer in a Remittance Report or otherwise. The Form 10-K shall also include a certification in the form attached hereto as Exhibit J-1 (the “Certification”), which shall be signed by the Master Servicer.

(c) In addition, the Trustee shall sign a certification (in the form attached hereto as Exhibit J-2) for the benefit of the Master Servicer and its officers, directors and Affiliates regarding certain aspects of the Certification (provided, however, that the Trustee shall not undertake an analysis of the accountant’s report attached as an exhibit to the Form 10-K). The Trustee’s certification shall be delivered to the Master Servicer by no later than March 15^th of each year, commencing in 2006 (or if such day is not a Business Day, the immediately preceding Business Day) and the Master Servicer shall deliver the Certification to the Trustee for filing no later than March 25^th of each year (or if such day is not a Business Day, the immediately preceding Business Day).

In addition, (i) the Trustee shall, subject to the provisions of Sections 8.01 and 8.02, indemnify and hold harmless the Depositor and the Master Servicer and their respective officers, directors and Affiliates from and against any losses, damages, penalties, fines, forfeitures, reasonable and necessary legal fees and related costs, judgments and other costs and expenses arising out of or based upon a breach of the Trustee’s obligations under this Section 4.06(c) or the Trustee’s negligence, bad faith or willful misconduct in connection therewith, and (ii) the Master Servicer shall indemnify and hold harmless the Depositor, the Trustee and their respective officers, directors and Affiliates from and against any losses, damages, penalties, fines, forfeitures, reasonable and necessary legal fees and related costs, judgments and other costs and expenses arising out of or based upon a breach of the Master Servicer’s obligations

under this Section 4.06(c) or the Master Servicer’s negligence, bad faith or willful misconduct in connection therewith. If the indemnification provided for herein is unavailable or insufficient to hold harmless the Depositor or the Master Servicer, then (i) the Trustee agrees that it shall contribute to the amount paid or payable by the Depositor or the Master Servicer, as applicable, as a result of the losses, claims, damages or liabilities of the Depositor or the Master Servicer, as applicable, in such proportion as is appropriate to reflect the relative fault of the Depositor or the Master Servicer, as applicable, on the one hand and the Trustee on the other in connection with a breach of the Trustee’s obligations under this Section 4.06(c) or the Trustee’s negligence, bad faith or willful misconduct in connection therewith and (ii) the Master Servicer agrees that it shall contribute to the amount paid or payable by the Depositor or the Trustee, as applicable, as a result of the losses, claims, damages or liabilities of the Depositor or the Trustee, as applicable, in such proportion as is appropriate to reflect the relative fault of the Depositor or the Trustee, as applicable, on the one hand and the Master Servicer on the other in connection with a breach of the Master Servicer’s obligations under this Section 4.06(c) or the Master Servicer’s negligence, bad faith or willful misconduct in connection therewith. Notwithstanding any other provision in this Agreement to the contrary, the Master Servicer shall not have any responsibility or liability to any party relating to the certification or information prepared, certified or distributed by the Trustee or any other party other than the Master Servicer unless such information was derived from erroneous or incomplete information required to be provided by the Master Servicer under this Agreement.

(d) Upon any filing with the Commission pursuant to this Section 4.06, the Trustee shall promptly deliver to the Depositor a copy of any executed report, statement or information.

(e) Prior to January 30 of the first year in which the Trustee is able to do so under applicable law, the Trustee shall file a Form 15 Suspension Notification with respect to the Trust Fund.

ARTICLE V

THE CERTIFICATES

Section 5.01.

The Certificates.

(a) The Certificates in the aggregate will represent the entire beneficial ownership interest in the Mortgage Loans and all other assets included in REMIC I.

The Certificates will be substantially in the forms annexed hereto as Exhibits A-1 through A-20. The Certificates of each Class will be issuable in registered form only, in denominations of authorized Percentage Interests as described in the definition thereof. Each Certificate will share ratably in all rights of the related Class.

Upon original issue, the Certificates shall be executed by the Trustee and authenticated and delivered by the Trustee to or upon the order of the Depositor. The Certificates shall be executed by manual or facsimile signature on behalf of the Trustee by an authorized signatory. Certificates bearing the manual or facsimile signatures of individuals who were at any time the proper officers of the Trustee shall bind the Trustee notwithstanding that such individuals or any of them have ceased to hold such offices prior to the authentication and delivery of such Certificates or did not hold such offices at the date of such Certificates. No Certificate shall be entitled to any benefit under this Agreement or be valid for any purpose, unless there appears on such Certificate a certificate of authentication substantially in the form provided herein executed by the Trustee by manual signature, and such certificate of authentication shall be conclusive evidence, and the only evidence, that such Certificate has been duly authenticated and delivered hereunder. All Certificates shall be dated the date of their authentication.

(b) The Class A Certificates and the Mezzanine Certificates shall initially be issued as one or more Certificates held by the Book-Entry Custodian or, if appointed to hold such Certificates as provided below, the Depository and registered in the name of the Depository or its nominee and, except as provided below, registration of such Certificates may not be transferred by the Trustee except to another Depository that agrees to hold such Certificates for the respective Certificate Owners with Ownership Interests therein. The Certificate Owners shall hold their respective Ownership Interests in and to such Certificates through the book-entry facilities of the Depository and, except as provided below, shall not be entitled to definitive, fully registered Certificates (“Definitive Certificates”) in respect of such Ownership Interests. All transfers by Certificate Owners of their respective Ownership Interests in the Book-Entry Certificates shall be made in accordance with the procedures established by the Depository Participant or brokerage firm representing such Certificate Owner. Each Depository Participant shall only transfer the Ownership Interests in the Book-Entry Certificates of Certificate Owners it represents or of brokerage firms for which it acts as agent in accordance with the Depository’s normal procedures. The Trustee is hereby initially appointed as the Book-Entry Custodian and hereby agrees to act as such in accordance herewith and in accordance with the agreement that it has with the Depository authorizing it to act as such. The Book-Entry Custodian may, and, if it is no longer qualified to act as such, the Book-Entry Custodian shall, appoint, by a written instrument delivered to the Depositor, the Master Servicer and the Trustee, any other transfer

agent (including the Depository or any successor Depository) to act as Book-Entry Custodian under such conditions as the predecessor Book-Entry Custodian and the Depository or any successor Depository may prescribe, provided that the predecessor Book-Entry Custodian shall not be relieved of any of its duties or responsibilities by reason of any such appointment of other than the Depository. If the Trustee resigns or is removed in accordance with the terms hereof, the Trustee, the successor trustee or, if it so elects, the Depository shall immediately succeed to its predecessor’s duties as Book-Entry Custodian. The Depositor shall have the right to inspect, and to obtain copies of, any Certificates held as Book-Entry Certificates by the Book-Entry Custodian.

The Trustee, the Master Servicer and the Depositor may for all purposes (including the making of payments due on the Book-Entry Certificates) deal with the Depository as the authorized representative of the Certificate Owners with respect to the Book-Entry Certificates for the purposes of exercising the rights of Certificateholders hereunder. The rights of Certificate Owners with respect to the Book-Entry Certificates shall be limited to those established by law and agreements between such Certificate Owners and the Depository Participants and brokerage firms representing such Certificate Owners. Multiple requests and directions from, and votes of, the Depository as Holder of the Book-Entry Certificates with respect to any particular matter shall not be deemed inconsistent if they are made with respect to different Certificate Owners. The Trustee may establish a reasonable record date in connection with solicitations of consents from or voting by Certificateholders and shall give notice to the Depository of such record date.

If (i)(A) the Depositor advises the Trustee in writing that the Depository is no longer willing or able to properly discharge its responsibilities as Depository, and (B) the Depositor is unable to locate a qualified successor (ii) the Depositor notifies the Trustee and the Depository of its intent to terminate the book-entry system through the Depoistory and, upon receipt of notice of such intent from the Depository, the Certificate Owners agree to such termination or (iii) after the occurrence of a Master Servicer Event of Default, Certificate Owners representing in the aggregate not less than 51% of the Ownership Interests of the Book-Entry Certificates advise the Trustee through the Depository, in writing, that the continuation of a book-entry system through the Depository is no longer in the best interests of the Certificate Owners, the Trustee shall notify all Certificate Owners, through the Depository, of the occurrence of any such event and of the availability of Definitive Certificates to Certificate Owners requesting the same. Upon surrender to the Trustee of the Book-Entry Certificates by the Book-Entry Custodian or the Depository, as applicable, accompanied by registration instructions from the Depository for registration of transfer, the Trustee shall cause the Definitive Certificates to be issued. Such Definitive Certificates will be issued in minimum denominations of $25,000, except that any beneficial ownership that was represented by a Book-Entry Certificate in an amount less than $25,000 immediately prior to the issuance of a Definitive Certificate shall be issued in a minimum denomination equal to the amount represented by such Book-Entry Certificate. None of the Depositor, the Master Servicer or the Trustee shall be liable for any delay in the delivery of such instructions and may conclusively rely on, and shall be protected in relying on, such instructions. Upon the issuance of Definitive Certificates all references herein to obligations imposed upon or to be performed by the Depository shall be deemed to be imposed upon and performed by the Trustee, to the extent applicable with respect to such Definitive

Certificates, and the Trustee shall recognize the Holders of the Definitive Certificates as Certificateholders hereunder.

Section 5.02.

Registration of Transfer and Exchange of Certificates.

(a) The Trustee shall cause to be kept at one of the offices or agencies to be appointed by the Trustee in accordance with the provisions of Section 8.11, a Certificate Register for the Certificates in which, subject to such reasonable regulations as it may prescribe, the Trustee shall provide for the registration of Certificates and of transfers and exchanges of Certificates as herein provided.

(b) No transfer of any Class CE Certificate, Class P Certificate or Residual Certificate shall be made unless that transfer is made pursuant to an effective registration statement under the Securities Act of 1933, as amended (the “1933 Act”), and effective registration or qualification under applicable state securities laws, or is made in a transaction that does not require such registration or qualification. In the event that such a transfer of a Class CE Certificate, Class P Certificate or Residual Certificate is to be made without registration or qualification (other than in connection with the initial transfer of any such Certificate by the Depositor to an affiliate of the Depositor), the Trustee shall require receipt of: (i) if such transfer is purportedly being made in reliance upon Rule 144A under the 1933 Act, written certifications from the Certificateholder desiring to effect the transfer and from such Certificateholder’s prospective transferee, substantially in the forms attached hereto as Exhibit F-1; and (ii) in all other cases, an Opinion of Counsel satisfactory to it that such transfer may be made without such registration or qualification (which Opinion of Counsel shall not be an expense of the Trust Fund or of the Depositor, the Trustee, the Master Servicer in its capacity as such or any Sub-Servicer), together with copies of the written certification(s) of the Certificateholder desiring to effect the transfer and/or such Certificateholder’s prospective transferee upon which such Opinion of Counsel is based, if any. None of the Depositor, the Master Servicer or the Trustee is obligated to register or qualify any such Certificates under the 1933 Act or any other securities laws or to take any action not otherwise required under this Agreement to permit the transfer of such Certificates without registration or qualification. Any Certificateholder desiring to effect the transfer of any such Certificate shall, and does hereby agree to, indemnify the Trustee, the Depositor and the Master Servicer against any liability that may result if the transfer is not so exempt or is not made in accordance with such federal and state laws.

(c) No transfer of a Class CE Certificate, Class P Certificate or Residual Certificate or any interest therein shall be made to any Plan subject to ERISA or Section 4975 of the Code, any Person acting, directly or indirectly, on behalf of any such Plan or any Person acquiring such Certificates with “Plan Assets” of a Plan within the meaning of the Department of Labor regulation promulgated at 29 C. F. R. § 2510.3-101 (“Plan Assets”), as certified by such transferee in the form of Exhibit G, unless the Depositor, the Trustee and the Master Servicer are provided with an Opinion of Counsel which establishes to the satisfaction of the Depositor, the Trustee and the Master Servicer that the purchase of such Certificates is permissible under applicable law, will not constitute or result in any prohibited transaction under ERISA or Section 4975 of the Code and will not subject the Depositor, the Master Servicer, the NIMS Insurer, the Trustee or the Trust Fund to any obligation or liability (including obligations or liabilities under ERISA or Section 4975 of the Code) in addition to those undertaken in this Agreement, which

Opinion of Counsel shall not be an expense of the Depositor, the Master Servicer, the Trustee or the Trust Fund. Neither an Opinion of Counsel nor any certification will be required in connection with the initial transfer of any such Certificate by the Depositor to an affiliate of the Depositor (in which case, the Depositor or any affiliate thereof shall have deemed to have represented that such affiliate is not a Plan or a Person investing Plan Assets) and the Trustee shall be entitled to conclusively rely upon a representation (which, upon the request of the Trustee, shall be a written representation) from the Depositor of the status of such transferee as an affiliate of the Depositor.

Each beneficial owner of a Mezzanine Certificates or any interest therein shall be deemed to have represented, by virtue of its acquisition or holding of that certificate or interest therein, that either (i) it is not a Plan investor, (ii) it has acquired and is holding such Mezzanine Certificates in reliance on the Underwriters’ Exemption, and that it understands that there are certain conditions to the availability of the Underwriters’ Exemption, including that the Mezzanine Certificates must be rated, at the time of purchase, not lower than” BBB-“ (or its equivalent) by Fitch, Moody’s or S&P or (iii) (1) it is an insurance company, (2) the source of funds used to acquire or hold the certificate or interest therein is an “insurance company general account,” as such term is defined in PTCE 95-60, and (3) the conditions in Sections I and III of PTCE 95-60 have been satisfied.

If any Mezzanine Certificate, Class CE Certificate, Class P Certificate or Residual Certificate or any interest therein is acquired or held in violation of the provisions of the preceding two paragraphs, the last preceding permitted beneficial owner will be treated as the beneficial owner of that Certificate retroactive to the date of transfer to the purported beneficial owner. Any purported beneficial owner whose acquisition or holding of any such Certificate or interest therein was effected in violation of the provisions of the preceding two paragraphs shall indemnify and hold harmless the Depositor, the Master Servicer, the NIMS Insurer, the Trustee and the Trust Fund from and against any and all liabilities, claims, costs or expenses incurred by those parties as a result of that acquisition or holding.

(d)(i) Each Person who has or who acquires any Ownership Interest in a Residual Certificate shall be deemed by the acceptance or acquisition of such Ownership Interest to have agreed to be bound by the following provisions and to have irrevocably authorized the Trustee or its designee under clause (iii)(A) below to deliver payments to a Person other than such Person and to negotiate the terms of any mandatory sale under clause (iii)(B) below and to execute all instruments of Transfer and to do all other things necessary in connection with any such sale. The rights of each Person acquiring any Ownership Interest in a Residual Certificate are expressly subject to the following provisions:

(A) Each Person holding or acquiring any Ownership Interest in a Residual Certificate shall be a Permitted Transferee and shall promptly notify the Trustee of any change or impending change in its status as a Permitted Transferee.

(B) In connection with any proposed Transfer of any Ownership Interest in a Residual Certificate, the Trustee shall require delivery to it, and shall not register the Transfer of any Residual Certificate until its receipt of, an affidavit and agreement (a “Transfer Affidavit and Agreement,” in the form attached hereto as Exhibit F-2) from the

proposed Transferee, in form and substance satisfactory to the Trustee, representing and warranting, among other things, that such Transferee is a Permitted Transferee, that it is not acquiring its Ownership Interest in the Residual Certificate that is the subject of the proposed Transfer as a nominee, trustee or agent for any Person that is not a Permitted Transferee, that for so long as it retains its Ownership Interest in a Residual Certificate, it will endeavor to remain a Permitted Transferee, and that it has reviewed the provisions of this Section 5.02(d) and agrees to be bound by them.

(C) Notwithstanding the delivery of a Transfer Affidavit and Agreement by a proposed Transferee under clause (B) above, if a Responsible Officer of the Trustee who is assigned to this transaction has actual knowledge that the proposed Transferee is not a Permitted Transferee, no Transfer of an Ownership Interest in a Residual Certificate to such proposed Transferee shall be effected.

(D) Each Person holding or acquiring any Ownership Interest in a Residual Certificate shall agree (x) to require a Transfer Affidavit and Agreement in the form attached hereto as Exhibit F-2 from any other Person to whom such Person attempts to transfer its Ownership Interest in a Residual Certificate and (y) not to transfer its Ownership Interest unless it provides a Transferor Affidavit (in the form attached hereto as Exhibit F-2) to the Trustee stating that, among other things, it has no actual knowledge that such other Person is not a Permitted Transferee.

(E) Each Person holding or acquiring an Ownership Interest in a Residual Certificate, by purchasing an Ownership Interest in such Certificate, agrees to give the Trustee written notice that it is a “pass-through interest holder” within the meaning of temporary Treasury regulation Section 1.67-3T(a)(2)(i)(A) immediately upon acquiring an Ownership Interest in a Residual Certificate, if it is, or is holding an Ownership Interest in a Residual Certificate on behalf of, a “pass-through interest holder.”

(ii) The Trustee will register the Transfer of any Residual Certificate only if it shall have received the Transfer Affidavit and Agreement and all of such other documents as shall have been reasonably required by the Trustee as a condition to such registration. In addition, no Transfer of a Residual Certificate shall be made unless the Trustee shall have received a representation letter from the Transferee of such Certificate to the effect that such Transferee is a Permitted Transferee.

(iii)(A) If any purported Transferee shall become a Holder of a Residual Certificate in violation of the provisions of this Section 5.02(d), then the last preceding Permitted Transferee shall be restored, to the extent permitted by law, to all rights as holder thereof retroactive to the date of registration of such Transfer of such Residual Certificate. The Trustee shall be under no liability to any Person for any registration of Transfer of a Residual Certificate that is in fact not permitted by this Section 5.02(d) or for making any payments due on such Certificate to the holder thereof or for taking any other action with respect to such holder under the provisions of this Agreement.

(B) If any purported Transferee shall become a holder of a Residual Certificate in violation of the restrictions in this Section 5.02(d) and to the extent that the retroactive restoration of the rights of the holder of such Residual Certificate as described in clause (iii)(A) above shall be invalid, illegal or unenforceable, then the Trustee shall have the right, without notice to the holder or any prior holder of such Residual Certificate, to sell such Residual Certificate to a purchaser selected by the Trustee on such terms as the Trustee may choose. Such purported Transferee shall promptly endorse and deliver each Residual Certificate in accordance with the instructions of the Trustee. Such purchaser may be the Trustee itself or any Affiliate of the Trustee. The proceeds of such sale, net of the commissions (which may include commissions payable to the Trustee or its Affiliates), expenses and taxes due, if any, will be remitted by the Trustee to such purported Transferee. The terms and conditions of any sale under this clause (iii)(B) shall be determined in the sole discretion of the Trustee, and the Trustee shall not be liable to any Person having an Ownership Interest in a Residual Certificate as a result of its exercise of such discretion.

(iv) The Trustee shall make available to the Internal Revenue Service and those Persons specified by the REMIC Provisions all information necessary to compute any tax imposed (A) as a result of the Transfer of an Ownership Interest in a Residual Certificate to any Person who is a Disqualified Organization, including the information described in Treasury regulations sections 1.860D-1(b)(5) and 1.860E-2(a)(5) with respect to the “excess inclusions” of such Residual Certificate and (B) as a result of any regulated investment company, real estate investment trust, common Trust, partnership, trust, estate or organization described in Section 1381 of the Code that holds an Ownership Interest in a Residual Certificate having as among its record holders at any time any Person which is a Disqualified Organization. Reasonable compensation for providing such information may be accepted by the Trustee.

(v) The provisions of this Section 5.02(d) set forth prior to this subsection (v) may be modified, added to or eliminated, provided that there shall have been delivered to the Trustee and the NIMS Insurer at the expense of the party seeking to modify, add to or eliminate any such provision the following:

(A) written notification from each Rating Agency to the effect that the modification, addition to or elimination of such provisions will not cause such Rating Agency to downgrade its then-current ratings of any Class of Certificates; and

(B) an Opinion of Counsel, in form and substance satisfactory to the Trustee and the NIMS Insurer, to the effect that such modification of, addition to or elimination of such provisions will not cause any Trust REMIC to cease to qualify as a REMIC and will not cause any Trust REMIC to be subject to an entity-level tax caused by the Transfer of any Residual Certificate to a Person that is not a Permitted Transferee or a Person other than the prospective transferee to be subject to a REMIC-tax caused by the Transfer of a Residual Certificate to a Person that is not a Permitted Transferee.

The Trustee shall forward to the NIMS Insurer a copy of the items delivered to it pursuant to (A) and (B) above.

(e) Subject to the preceding subsections, upon surrender for registration of transfer of any Certificate at any office or agency of the Trustee maintained for such purpose pursuant to Section 8.11, the Trustee shall execute, authenticate and deliver, in the name of the designated Transferee or Transferees, one or more new Certificates of the same Class of a like aggregate Percentage Interest.

(d) (f) At the option of the Holder thereof, any Certificate may be exchanged for other Certificates of the same Class with authorized denominations and a like aggregate Percentage Interest, upon surrender of such Certificate to be exchanged at any office or agency of the Trustee maintained for such purpose pursuant to Section 8.11. Whenever any Certificates are so surrendered for exchange, the Trustee shall execute, authenticate and deliver, the Certificates which the Certificateholder making the exchange is entitled to receive. Every Certificate presented or surrendered for transfer or exchange shall (if so required by the Trustee) be duly endorsed by, or be accompanied by a written instrument of transfer in the form satisfactory to the Trustee duly executed by, the Holder thereof or his attorney duly authorized in writing. In addition, (i) with respect to each Class R Certificate, the holder thereof may exchange, in the manner described above, such Class R Certificate for two separate certificates, each representing such holder’s respective Percentage Interest in the Class R-I Interest and the Class R-II Interest, respectively, in each case that was evidenced by the Class R Certificate being exchanged and (ii) with respect to each Class R-X Certificate, the holder thereof may exchange, in the manner described above, such Class R-X Certificate for two separate certificates, each representing such holder’s respective Percentage Interest in the Class R-III Interest and the Class R-IV Interest, respectively, in each case that was evidenced by the Class R-X Certificate being exchanged.

(g) No service charge to the Certificateholders shall be made for any transfer or exchange of Certificates, but the Trustee may require payment of a sum sufficient to cover any tax or governmental charge that may be imposed in connection with any transfer or exchange of Certificates.

(h) All Certificates surrendered for transfer and exchange shall be canceled and destroyed by the Trustee in accordance with its customary procedures.

Section 5.03.

Mutilated, Destroyed, Lost or Stolen Certificates.

If (i) any mutilated Certificate is surrendered to the Trustee, or the Trustee receives evidence to its satisfaction of the destruction, loss or theft of any Certificate, and (ii) there is delivered to the Trustee and the NIMS Insurer such security or indemnity as may be required by it to save it harmless, then, in the absence of actual knowledge by the Trustee that such Certificate has been acquired by a bona fide purchaser, the Trustee shall execute, authenticate and deliver, in exchange for or in lieu of any such mutilated, destroyed, lost or stolen Certificate, a new Certificate of the same Class and of like denomination and Percentage Interest. Upon the issuance of any new Certificate under this Section, the Trustee may require the payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto and any other expenses (including the fees and expenses of the Trustee) connected therewith. Any replacement Certificate issued pursuant to this Section shall constitute complete and indefeasible evidence of ownership in the applicable REMIC created hereunder, as

if originally issued, whether or not the lost, stolen or destroyed Certificate shall be found at any time.

Section 5.04.

Persons Deemed Owners.

The Depositor, the Master Servicer, the NIMS Insurer, the Trustee and any agent of any of them may treat the Person in whose name any Certificate is registered as the owner of such Certificate for the purpose of receiving distributions pursuant to Section 4.01 and for all other purposes whatsoever, and none of the Depositor, the Master Servicer, the NIMS Insurer, the Trustee or any agent of any of them shall be affected by notice to the contrary.

Section 5.05.

Certain Available Information.

On or prior to the date of the first sale of any Class CE Certificate, Class P Certificate or Residual Certificate to an Independent third party, the Depositor shall provide to the Trustee ten copies of any private placement memorandum or other disclosure document used by the Depositor in connection with the offer and sale of such Certificates. In addition, if any such private placement memorandum or disclosure document is revised, amended or supplemented at any time following the delivery thereof to the Trustee, the Depositor promptly shall inform the Trustee of such event and shall deliver to the Trustee ten copies of the private placement memorandum or disclosure document, as revised, amended or supplemented. The Trustee shall maintain at its Corporate Trust Office and shall make available free of charge during normal business hours for review by any Holder of a Certificate or any Person identified to the Trustee as a prospective transferee of a Certificate, originals or copies of the following items: (i) in the case of a Holder or prospective transferee of a Class CE Certificate, Class P Certificate or Residual Certificate, the related private placement memorandum or other disclosure document relating to such Class of Certificates, in the form most recently provided to the Trustee; and (ii) in all cases, (A) this Agreement and any amendments hereof entered into pursuant to Section 11.01, (B) all monthly statements required to be delivered to Certificateholders of the relevant Class pursuant to Section 4.02 since the Closing Date, and all other notices, reports, statements and written communications delivered to the Certificateholders of the relevant Class pursuant to this Agreement since the Closing Date, (C) all certifications delivered by a Responsible Officer of the Trustee since the Closing Date pursuant to Section 10.01(h), (D) any and all Officers’ Certificates delivered to the Trustee by the Master Servicer since the Closing Date to evidence the Master Servicer’s determination that any Advance or Servicing Advance was, or if made, would be a Nonrecoverable Advance or Nonrecoverable Servicing Advance, respectively, and (E) any and all Officers’ Certificates delivered to the Trustee by the Master Servicer since the Closing Date pursuant to Section 4.04(a). Copies and mailing of any and all of the foregoing items will be available from the Trustee upon request at the expense of the Person requesting the same.

ARTICLE VI

THE DEPOSITOR AND THE MASTER SERVICER

Section 6.01.

Liability of the Depositor and the Master Servicer.

The Depositor and the Master Servicer each shall be liable in accordance herewith only to the extent of the obligations specifically imposed by this Agreement upon them in their respective capacities as Depositor and Master Servicer and undertaken hereunder by the Depositor and the Master Servicer herein.

Section 6.02.

Merger or Consolidation of the Depositor or the Master Servicer.

Subject to the following paragraph, the Depositor will keep in full effect its existence, rights and franchises as a corporation under the laws of the jurisdiction of its incorporation. Subject to the following paragraph, the Master Servicer will keep in full effect its existence, rights and franchises as a corporation under the laws of the jurisdiction of its incorporation. The Depositor and the Master Servicer each will obtain and preserve its qualification to do business as a foreign corporation in each jurisdiction in which such qualification is or shall be necessary to protect the validity and enforceability of this Agreement, the Certificates or any of the Mortgage Loans and to perform its respective duties under this Agreement.

The Depositor or the Master Servicer may be merged or consolidated with or into any Person, or transfer all or substantially all of its assets to any Person, in which case any Person resulting from any merger or consolidation to which the Depositor or the Master Servicer shall be a party, or any Person succeeding to the business of the Depositor or the Master Servicer, shall be the successor of the Depositor or the Master Servicer, as the case may be, hereunder, without the execution or filing of any paper or any further act on the part of any of the parties hereto, anything herein to the contrary notwithstanding; provided, however, that the successor or surviving Person to the Master Servicer shall be qualified to service mortgage loans on behalf of Fannie Mae or Freddie Mac; and provided further that the Rating Agencies’ ratings of the Class A Certificates and the Mezzanine Certificates in effect immediately prior to such merger or consolidation will not be qualified, reduced or withdrawn as a result thereof (as evidenced by a letter to such effect from the Rating Agencies).

Section 6.03.

Limitation on Liability of the Depositor, the Master Servicer and Others.

(a) The Master Servicer (except the Trustee if it is required to succeed the Master Servicer hereunder) indemnifies and holds the NIMS Insurer and each Certificateholder harmless against any and all claims, losses, penalties, fines, forfeitures, reasonable legal fees and related costs, judgments, and any other costs, fees and expenses that the NIMS Insurer and any Certificateholder may sustain in any way related to the failure of the Master Servicer to perform its duties and service the Mortgage Loans in compliance with the terms of this Agreement. The Master Servicer shall immediately notify the NIMS Insurer and each Certificateholder if a claim is made that may result in such claims, losses, penalties, fines, forfeitures, legal fees or related

costs, judgments, or any other costs, fees and expenses, and the Master Servicer shall assume (with the consent of the Trustee) the defense of any such claim and pay all expenses in connection therewith, including reasonable counsel fees, and promptly pay, discharge and satisfy any judgment or decree which may be entered against the NIMS Insurer and/or the Certificateholder in respect of such claim. The provisions of this Section 6.03 shall survive the termination of this Agreement and the payment of the outstanding Certificates.

(b) None of the Depositor, the NIMS Insurer, the Master Servicer or any of the directors, officers, employees or agents of the Depositor or the Master Servicer shall be under any liability to the Trust Fund or the Certificateholders for any action taken or for refraining from the taking of any action in good faith pursuant to this Agreement, or for errors in judgment; provided, however, that this provision shall not protect the Depositor, the Master Servicer or any such person against any breach of warranties, representations or covenants made herein, or against any specific liability imposed on the Master Servicer pursuant hereto, or against any liability which would otherwise be imposed by reason of willful misfeasance, bad faith or gross negligence in the performance of duties or by reason of reckless disregard of obligations and duties hereunder or a breach of a representation or warranty hereunder or, in the case of the Master Servicer, a breach of the servicing standard set forth in Section 3.01. The Depositor, the NIMS Insurer and the Master Servicer and any director, officer, employee or agent of the Depositor, the NIMS Insurer or the Master Servicer may rely in good faith on any document of any kind which, prima facie, is properly executed and submitted by any Person respecting any matters arising hereunder. The Depositor, the NIMS Insurer, the Master Servicer and any director, officer, employee or agent of the Depositor, the NIMS Insurer or the Master Servicer shall be indemnified and held harmless by the Trust Fund against any loss, liability or expense incurred in connection with any legal action relating to this Agreement or the Certificates, other than any loss, liability or expense relating to any specific Mortgage Loan or Mortgage Loans (except as any such loss, liability or expense shall be otherwise reimbursable pursuant to this Agreement) or any loss, liability or expense incurred by reason of willful misfeasance, bad faith or gross negligence in the performance of duties hereunder or by reason of reckless disregard of obligations and duties hereunder. Neither the Depositor, the NIMS Insurer nor the Master Servicer shall be under any obligation to appear in, prosecute or defend any legal action unless such action is related to its respective duties under this Agreement and, in its opinion, does not involve it in any expense or liability; provided, however, that each of the Depositor, the NIMS Insurer and the Master Servicer may in its discretion undertake any such action which it may deem necessary or desirable with respect to this Agreement and the rights and duties of the parties hereto and the interests of the Certificateholders hereunder. In such event, unless the Depositor or the Master Servicer acts without the consent of Holders of Certificates entitled to at least 51% of the Voting Rights, the legal expenses and costs of such action and any liability resulting therefrom (except any loss, liability or expense incurred by reason of willful misfeasance, bad faith or gross negligence in the performance of duties hereunder or by reason of reckless disregard of obligations and duties hereunder) shall be expenses, costs and liabilities of the Trust Fund, and the Depositor, the NIMS Insurer and the Master Servicer shall be entitled to be reimbursed therefor from the Collection Account as and to the extent provided in Section 3.11, any such right of reimbursement being prior to the rights of the Certificateholders to receive any amount in the Collection Account. Without limiting the foregoing, the Master Servicer shall undertake to defend any claims against the Trust Fund, the Trustee, the NIMS

Insurer and/or itself initiated by a Borrower or otherwise related to the servicing of any Mortgage Loan.

Section 6.04.

Limitation on Resignation of the Master Servicer.

The Master Servicer shall not resign from the obligations and duties hereby imposed on it except upon determination that its duties hereunder are no longer permissible under applicable law. Any such determination pursuant to the preceding sentence permitting the resignation of the Master Servicer shall be evidenced by an Opinion of Counsel to such effect obtained at the expense of the Master Servicer and delivered to the Trustee and the NIMS Insurer. No resignation of the Master Servicer shall become effective until the Trustee or a successor servicer acceptable to the NIMS Insurer shall have assumed the Master Servicer’s responsibilities, duties, liabilities (other than those liabilities arising prior to the appointment of such successor) and obligations under this Agreement. Any such resignation shall not relieve the Master Servicer of responsibility for any of the obligations specified in Sections 7.01 and 7.02 as obligations that survive the resignation or termination of the Master Servicer.

Except as expressly provided herein, the Master Servicer shall not assign or transfer any of its rights, benefits or privileges hereunder to any other Person, or delegate to or subcontract with, or authorize or appoint any other Person to perform any of the duties, covenants or obligations to be performed by the Master Servicer hereunder. The foregoing prohibition on assignment shall not prohibit the Master Servicer from designating a Sub-Servicer as payee of any indemnification amount payable to the Master Servicer hereunder; provided, however, that as provided in Section 3.06 hereof, no Sub-Servicer shall be a third-party beneficiary hereunder and the parties hereto shall not be required to recognize any Sub-Servicer as an indemnitee under this Agreement. If, pursuant to any provision hereof, the duties of the Master Servicer are transferred to a successor master servicer, the entire amount of the Servicing Fee and other compensation payable to the Master Servicer pursuant hereto shall thereafter be payable to such successor master servicer.

Section 6.05.

Rights of the Depositor in Respect of the Master Servicer.

The Master Servicer shall afford (and any Sub-Servicing Agreement shall provide that each Sub-Servicer shall afford) the Depositor, the NIMS Insurer and the Trustee, upon reasonable notice, during normal business hours, access to all records maintained by the Master Servicer (and any such Sub-Servicer) in respect of the Master Servicer’s rights and obligations hereunder and access to officers of the Master Servicer (and those of any such Sub-Servicer) responsible for such obligations. Upon request, the Master Servicer shall furnish to the Depositor, the NIMS Insurer and the Trustee its (and any such Sub-Servicer’s) most recent financial statements and such other information relating to the Master Servicer’s capacity to perform its obligations under this Agreement as it possesses (and that any such Sub-Servicer possesses). To the extent such information is not otherwise available to the public, the Depositor, the NIMS Insurer and the Trustee shall not disseminate any information obtained pursuant to the preceding two sentences without the Master Servicer’s written consent, except as required pursuant to this Agreement or to the extent that it is appropriate to do so (i) in working with legal counsel, auditors, taxing authorities or other governmental agencies or (ii) pursuant to any law, rule, regulation, order, judgment, writ, injunction or decree of any court or governmental

authority having jurisdiction over the Depositor and the Trustee or the Trust Fund, and in any case, the Depositor, the NIMS Insurer or the Trustee as the case may be, shall use its best efforts to assure the confidentiality of any such disseminated non-public information. The Depositor may, but is not obligated to, enforce the obligations of the Master Servicer under this Agreement and may, but is not obligated to, perform, or cause a designee to perform, any defaulted obligation of the Master Servicer under this Agreement or exercise the rights of the Master Servicer under this Agreement; provided that the Master Servicer shall not be relieved of any of its obligations under this Agreement by virtue of such performance by the Depositor or its designee. The Depositor shall not have any responsibility or liability for any action or failure to act by the Master Servicer and is not obligated to supervise the performance of the Master Servicer under this Agreement or otherwise.

Section 6.06.

[Reserved].

ARTICLE VII

DEFAULT

Section 7.01.

Master Servicer Events of Default.

(a) “Master Servicer Event of Default,” wherever used herein, means any one of the following events:

(i) any failure by the Master Servicer to remit to the Trustee for distribution to the Certificateholders any payment (other than an Advance required to be made from its own funds on any Master Servicer Remittance Date pursuant to Section 4.03) required to be made under the terms of the Certificates and this Agreement which continues unremedied for a period of one Business Day after the date upon which written notice of such failure, requiring the same to be remedied, shall have been given to the Master Servicer by the Depositor or the Trustee (in which case notice shall be provided by telecopy), or to the Master Servicer, the Depositor and the Trustee by the NIMS Insurer or the Holders of Certificates entitled to at least 25% of the Voting Rights; or

(ii) any failure on the part of the Master Servicer duly to observe or perform in any material respect any other of the covenants or agreements on the part of the Master Servicer contained in this Agreement, or the breach by the Master Servicer of any representation and warranty contained in Section 2.05, which continues unremedied for a period of 30 days (or if such failure or breach cannot be remedied within 30 days, then such remedy shall have been commenced within 30 days and diligently pursued thereafter; provided, however, that in no event shall such failure or breach be allowed to exist for a period of greater than 90 days) after the earlier of (i) the date on which written notice of such failure, requiring the same to be remedied, shall have been given to the Master Servicer by the Depositor, the Trustee or to the Master Servicer, the Depositor and the Trustee by the NIMS Insurer or the Holders of Certificates entitled to at least 25% of the Voting Rights and (ii) actual knowledge of such failure by a Servicing Officer of the Master Servicer; or

(iii) a decree or order of a court or agency or supervisory authority having jurisdiction in the premises in an involuntary case under any present or future federal or state bankruptcy, insolvency or similar law or the appointment of a conservator or receiver or liquidator in any insolvency, readjustment of debt, marshalling of assets and liabilities or similar proceeding, or for the winding-up or liquidation of its affairs, shall have been entered against the Master Servicer and such decree or order shall have remained in force undischarged or unstayed for a period of 90 days; or

(iv) the Master Servicer shall consent to the appointment of a conservator or receiver or liquidator in any insolvency, readjustment of debt, marshalling of assets and liabilities or similar proceedings of or relating to it or of or relating to all or substantially all of its property; or

(v) the Master Servicer shall admit in writing its inability to pay its debts generally as they become due, file a petition to take advantage of any applicable insolvency or reorganization statute, make an assignment for the benefit of its creditors, or voluntarily suspend payment of its obligations; or

(vi) any failure by the Master Servicer of the Delinquency Master Servicer Termination Trigger; or

(vii) any failure of the Master Servicer to make any Advance on any Master Servicer Remittance Date required to be made from its own funds pursuant to Section 4.03 which continues unremedied until 5:00 p.m. New York time on such Master Servicer Remittance Date.

If a Master Servicer Event of Default described in clauses (i) through (vi) of this Section shall occur, then, and in each and every such case, so long as such Master Servicer Event of Default shall not have been remedied, the Depositor or the Trustee may, and at the written direction of the Holders of Certificates entitled to at least 51% of Voting Rights or the NIMS Insurer, the Trustee shall, by notice in writing to the Master Servicer (and to the Depositor if given by the Trustee or to the Trustee if given by the Depositor), terminate all of the rights and obligations of the Master Servicer in its capacity as Master Servicer under this Agreement, to the extent permitted by law, and in and to the Mortgage Loans and the proceeds thereof. If a Master Servicer Event of Default described in clause (vii) hereof shall occur, the Trustee shall, by notice in writing to the Master Servicer, the Depositor and the NIMS Insurer, terminate all of the rights and obligations of the Master Servicer in its capacity as Master Servicer under this Agreement and in and to the Mortgage Loans and the proceeds thereof. On or after the receipt by the Master Servicer of such written notice, all authority and power of the Master Servicer under this Agreement, whether with respect to the Certificates (other than as a Holder of any Certificate) or the Mortgage Loans or otherwise, shall pass to and be vested in the Trustee pursuant to and under this Section, and, without limitation, the Trustee is hereby authorized and empowered, as attorney-in-fact or otherwise, to execute and deliver, on behalf of and at the expense of the Master Servicer, any and all documents and other instruments and to do or accomplish all other acts or things necessary or appropriate to effect the purposes of such notice of termination, whether to complete the transfer and endorsement or assignment of the Mortgage Loans and related documents, or otherwise. The Master Servicer agrees to promptly (and in any event no later than ten Business Days subsequent to such notice) provide the Trustee with all documents and records requested by it to enable it to assume the Master Servicer’s functions under this Agreement, and to cooperate with the Trustee in effecting the termination of the Master Servicer’s responsibilities and rights under this Agreement, including, without limitation, the transfer within one Business Day to the Trustee for administration by it of all cash amounts which at the time shall be or should have been credited by the Master Servicer to the Collection Account held by or on behalf of the Master Servicer, the Distribution Account or any REO Account or Servicing Account held by or on behalf of the Master Servicer or thereafter be received with respect to the Mortgage Loans or any REO Property serviced by the Master Servicer (provided, however, that the Master Servicer shall continue to be entitled to receive all amounts accrued or owing to it under this Agreement on or prior to the date of such termination, whether in respect of Advances or otherwise, and shall continue to be entitled to the benefits of Section 6.03, notwithstanding any such termination, with respect to events occurring prior to

such termination). For purposes of this Section 7.01, the Trustee shall not be deemed to have knowledge of a Master Servicer Event of Default unless a Responsible Officer of the Trustee assigned to and working in the Trustee’s Corporate Trust Office has actual knowledge thereof or unless written notice of any event which is in fact such a Master Servicer Event of Default is received by the Trustee and such notice references the Certificates, the Trust Fund or this Agreement.

Section 7.02.

Trustee to Act; Appointment of Successor.

(a)(1) From the time the Master Servicer (and the Trustee, if notice is sent by the Holders of Certificates entitled to at least 51% of Voting Rights or the NIMS Insurer) receives a notice of termination, the Trustee (or such other successor Master Servicer as is acceptable to the NIMS Insurer) shall be the successor in all respects to the Master Servicer in its capacity as Master Servicer under this Agreement and the transactions set forth or provided for herein, and all the responsibilities, duties and liabilities relating thereto and arising thereafter shall be assumed by the Trustee (except for any representations or warranties of the Master Servicer under this Agreement, the responsibilities, duties and liabilities contained in Section 2.05 (other than with respect to Section 2.05(x)) and the obligation to deposit amounts in respect of losses pursuant to Section 3.12) by the terms and provisions hereof; provided, however, the Trustee shall immediately assume the Master Servicer’s obligations to make Advances pursuant to Section 4.03; provided, further, however, that if the Trustee is prohibited by law or regulation from obligating itself to make advances regarding delinquent mortgage loans, then the Trustee shall not be obligated to make Advances pursuant to Section 4.03; and provided further, that any failure to perform such duties or responsibilities caused by the Master Servicer’s failure to provide information required by Section 7.01 shall not be considered a default by the Trustee as successor to the Master Servicer hereunder. It is understood and acknowledged by the parties hereto that there will be a period of transition (not to exceed 90 days) before the transition of servicing obligations is fully effective. As compensation therefor, the Trustee shall be entitled to the Servicing Fee and all funds relating to the Mortgage Loans to which the Master Servicer would have been entitled if it had continued to act hereunder. Notwithstanding the above and subject to Section 7.02(a)(2) below, the Trustee if it shall be unwilling to so act, or shall, if it is unable to so act or if it is prohibited by law from making advances regarding delinquent mortgage loans or if the Holders of Certificates entitled to at least 51% of the Voting Rights or the NIMS Insurer so request in writing to the Trustee, promptly appoint or petition a court of competent jurisdiction to appoint, an established mortgage loan servicing institution acceptable to each Rating Agency and the NIMS Insurer and having a net worth of not less than $15,000,000, as the successor to the Master Servicer under this Agreement in the assumption of all or any part of the responsibilities, duties or liabilities of the Master Servicer under this Agreement.

Pending appointment of a successor to the Master Servicer hereunder, unless the Trustee is prohibited by law from so acting, the Trustee shall act in such capacity as hereinabove provided. In connection with such appointment and assumption, the successor shall be entitled to receive compensation out of payments on Mortgage Loans in an amount equal to the compensation which the Master Servicer would otherwise have received pursuant to Section 3.18 (or such other compensation as the Trustee and such successor shall agree, not to exceed the Servicing Fee). The appointment of a successor Master Servicer shall not affect any liability of

the predecessor Master Servicer which may have arisen under this Agreement prior to its termination as Master Servicer to pay any deductible under an insurance policy pursuant to Section 3.14 or to indemnify the NIMS Insurer pursuant to Section 6.03), nor shall any successor Master Servicer be liable for any acts or omissions of the predecessor Master Servicer or for any breach by such Master Servicer of any of its representations or warranties contained herein or in any related document or agreement. The Trustee and such successor shall take such action, consistent with this Agreement, as shall be necessary to effectuate any such succession. All Servicing Transfer Costs shall be paid by the predecessor Master Servicer upon presentation of reasonable documentation of such costs, and if such predecessor Master Servicer defaults in its obligation to pay such costs, such costs shall be paid by the successor Master Servicer or the Trustee (in which case the successor Master Servicer or the Trustee, as applicable, shall be entitled to reimbursement therefor from the assets of the Trust Fund pursuant to Section 3.11(b)).

(2) No appointment of a successor to the Master Servicer under this Agreement shall be effective until the assumption by the successor of all of the Master Servicer’s responsibilities, duties and liabilities hereunder. In connection with such appointment and assumption described herein, the Trustee may make such arrangements for the compensation of such successor out of payments on Mortgage Loans as it and such successor shall agree; provided, however, that no such compensation shall be in excess of that permitted the Master Servicer as such hereunder. The Depositor, the Trustee and such successor shall take such action, consistent with this Agreement, as shall be necessary to effectuate any such succession. Pending appointment of a successor to the Master Servicer under this Agreement or the Trustee shall act in such capacity as hereinabove provided.

Any successor to the Master Servicer, including the Trustee, shall during the term of its service as servicer continue to service and administer the Mortgage Loans for the benefit of Certificateholders, and maintain in force a policy or policies of insurance covering errors and omissions in the performance of its obligations as Master Servicer hereunder and a Fidelity Bond in respect of its officers, employees and agents to the same extent as the Master Servicer is so required pursuant to Section 3.14.

(b)	[Reserved].
Section 7.03.		Notification to Certificateholders.

(a) Upon any termination of the Master Servicer pursuant to Section 7.01 above or any appointment of a successor to the Master Servicer pursuant to Section 7.02 above, the Trustee shall give prompt written notice thereof to Certificateholders and the NIMS Insurer at their respective addresses appearing in the Certificate Register.

(b) Not later than the later of 60 days after the occurrence of any event, which constitutes or which, with notice or lapse of time or both, would constitute a Master Servicer Event of Default or five days after a Responsible Officer of the Trustee becomes aware of the occurrence of such an event, the Trustee shall transmit by mail to the NIMS Insurer and to all Holders of Certificates notice of each such occurrence, unless such default or Master Servicer Event of Default shall have been cured or waived.

Section 7.04.

Waiver of Master Servicer Events of Default.

The Holders representing at least 66% of the Voting Rights (with the consent of the NIMS Insurer) evidenced by all Classes of Certificates affected by any default or Master Servicer Event of Default hereunder may waive such default or Master Servicer Event of Default; provided, however, that a default or Master Servicer Event of Default under clause (i) or (vii) of Section 7.01 may be waived only by all of the Holders of the Regular Certificates (with the consent of the NIMS Insurer). Upon any such waiver of a default or Master Servicer Event of Default, such default or Master Servicer Event of Default shall cease to exist and shall be deemed to have been remedied for every purpose hereunder. No such waiver shall extend to any subsequent or other default or Master Servicer Event of Default or impair any right consequent thereon except to the extent expressly so waived. Notice of any such waiver shall be given by the Trustee to the Rating Agencies and the NIMS Insurer.

Section 7.05.

Survivability of Master Servicer Liabilities.

Notwithstanding anything herein to the contrary, upon termination of the Master Servicer hereunder, any liabilities of the Master Servicer which accrued prior to such termination shall survive such termination.

ARTICLE VIII

CONCERNING THE TRUSTEE

Section 8.01.

Duties of Trustee.

The Trustee prior to the occurrence of a Master Servicer Event of Default and after the curing of all Master Servicer Events of Default which may have occurred, undertakes to perform such duties and only such duties as are specifically set forth in this Agreement. During a Master Servicer Event of Default, the Trustee shall exercise such of the rights and powers vested in it by this Agreement, and use the same degree of care and skill in their exercise as a prudent person would exercise or use under the circumstances in the conduct of such person’s own affairs. Any permissive right of the Trustee enumerated in this Agreement shall not be construed as a duty.

The Trustee upon receipt of all resolutions, certificates, statements, opinions, reports, documents, orders or other instruments furnished to it, which are specifically required to be furnished pursuant to any provision of this Agreement, shall examine them to determine whether they conform to the requirements of this Agreement. If any such instrument is found not to conform to the requirements of this Agreement in a material manner, it shall take such action as it deems appropriate to have the instrument corrected, and if the instrument is not corrected to its satisfaction, it will provide notice thereof to the Certificateholders and the NIMS Insurer.

No provision of this Agreement shall be construed to relieve the Trustee from liability for its own negligent action, its own negligent failure to act or its own misconduct; provided, however, that:

(i) Prior to the occurrence of a Master Servicer Event of Default, and after the curing of all such Master Servicer Events of Default which may have occurred, the duties and obligations of the Trustee shall be determined solely by the express provisions of this Agreement, the Trustee shall be liable except for the performance of such duties and obligations as are specifically set forth in this Agreement, no implied covenants or obligations shall be read into this Agreement against the Trustee, and in the absence of bad faith on the part of the Trustee, the Trustee may conclusively rely, as to the truth of the statements and the correctness of the opinions expressed therein, upon any certificates or opinions furnished to the Trustee that conform to the requirements of this Agreement;

(ii) The Trustee shall not be personally liable for an error of judgment made in good faith by a Responsible Officer or Responsible Officers of it unless it shall be proved that it was negligent in ascertaining the pertinent facts; and

(iii) The Trustee shall not be personally liable with respect to any action taken, suffered or omitted to be taken by it in good faith in accordance with the direction of the NIMS Insurer or the Holders of Certificates entitled to at least 25% of the Voting Rights relating to the time, method and place of conducting any proceeding for any remedy available to it or exercising any trust or power conferred upon it under this Agreement.

Section 8.02.		Certain Matters Affecting the Trustee.
(a)	Except as otherwise provided in Section 8.01:

(i) The Trustee may request and rely upon and shall be protected in acting or refraining from acting upon any resolution, Officers’ Certificate, certificate of auditors or any other certificate, statement, instrument, opinion, report, notice, request, consent, order, appraisal, bond or other paper or document reasonably believed by it to be genuine and to have been signed or presented by the proper party or parties;

(ii) The Trustee may consult with counsel and any Opinion of Counsel shall be full and complete authorization and protection in respect of any action taken or suffered or omitted by it hereunder in good faith and in accordance with such Opinion of Counsel;

(iii) The Trustee shall not be under any obligation to exercise any of the trusts or powers vested in it by this Agreement or to institute, conduct or defend any litigation hereunder or in relation hereto at the request, order or direction of any of the Certificateholders or the NIMS Insurer, pursuant to the provisions of this Agreement, unless such Certificateholders or the NIMS Insurer, as applicable, shall have offered to the Trustee reasonable security or indemnity against the costs, expenses and liabilities which may be incurred therein or thereby; nothing contained herein shall, however, relieve the Trustee of the obligation, upon the occurrence of a Master Servicer Event of Default (which has not been cured or waived), to exercise such of the rights and powers vested in it by this Agreement, and to use the same degree of care and skill in their exercise as a prudent person would exercise or use under the circumstances in the conduct of such person’s own affairs;

(iv) The Trustee shall not be personally liable for any action taken, suffered or omitted by it in good faith and believed by it to be authorized or within the discretion or rights or powers conferred upon it by this Agreement;

(v) Prior to the occurrence of a Master Servicer Event of Default hereunder and after the curing of all Master Servicer Events of Default which may have occurred, the Trustee shall not be bound to make any investigation into the facts or matters stated in any resolution, certificate, statement, instrument, opinion, report, notice, request, consent, order, approval, bond or other paper or document, unless requested in writing to do so by the NIMS Insurer or the Holders of Certificates entitled to at least 25% of the Voting Rights; provided, however, that if the payment within a reasonable time to the Trustee, of the costs, expenses or liabilities likely to be incurred by it in the making of such investigation is, in the opinion of the Trustee, not reasonably assured to the Trustee, by such Certificateholders, the Trustee may require reasonable indemnity against such expense, or liability from such Certificateholders or the NIMS Insurer, as applicable, as a condition to taking any such action;

(vi) The Trustee may execute any of the trusts or powers hereunder or perform any duties hereunder either directly or by or through agents or attorneys; and

(vii) The Trustee shall not be personally liable for any loss resulting from the investment of funds held in the Collection Account at the direction of the Master Servicer pursuant to Section 3.12.

(b) All rights of action under this Agreement or under any of the Certificates, enforceable by the Trustee, may be enforced by it without the possession of any of the Certificates, or the production thereof at the trial or other proceeding relating thereto, and any such suit, action or proceeding instituted by the Trustee shall be brought in its name for the benefit of all the Holders of such Certificates, subject to the provisions of this Agreement.

(c) The Trustee is hereby directed by the Depositor to execute and deliver the Cap Contracts on behalf of the Trust Fund in the form presented to it by the Depositor.

Section 8.03.

Trustee not Liable for Certificates or Mortgage Loans.

The recitals contained herein and in the Certificates (other than the signature of the Trustee, the authentication of the Trustee on the Certificates, the acknowledgments of the Trustee contained in Article II and the representations and warranties of the Trustee in Section 8.12) shall be taken as the statements of the Depositor and the Trustee shall not assume any responsibility for their correctness. The Trustee shall not make any representations or warranties as to the validity or sufficiency of this Agreement (other than as specifically set forth in Section 8.12) or of the Certificates (other than the signature of the Trustee, and authentication of the Trustee on the Certificates) or of any Mortgage Loan or related document. The Trustee shall not be accountable for the use or application by the Depositor of any of the Certificates or of the proceeds of such Certificates, or for the use or application of any funds paid to the Depositor or the Master Servicer in respect of the Mortgage Loans or deposited in or withdrawn from the Collection Account by the Master Servicer, other than any funds held by or on behalf of the Trustee in accordance with Section 3.10.

Section 8.04.

Trustee May Own Certificates.

The Trustee in its individual capacity or any other capacity may become the owner or pledgee of Certificates with the same rights it would have if it were not the Trustee.

Section 8.05.

Trustee’s Fees and Expenses.

The Trustee shall be entitled to withdraw from the Distribution Account, pursuant to Section 3.11(b), on each Distribution Date and pay to itself the Trustee Fee. The Trustee and any director, officer, employee or agent of the Trustee, shall be indemnified by the Trust Fund and held harmless against any loss, liability or expense (not including expenses, disbursements and advances incurred or made by the Trustee including the compensation and the expenses and disbursements of its agents and counsel, in the ordinary course of the Trustee’s performance in accordance with the provisions of this Agreement) incurred by the Trustee arising out of or in connection with the acceptance or administration of its obligations and duties under this Agreement up to a limit of $600,000 per calendar year, other than any loss, liability or expense (i) resulting from any breach of the Master Servicer’s obligations in connection with this Agreement, (ii) that constitutes a specific liability of the Trustee pursuant to Section 10.01(g) or

(iii) any loss, liability or expense incurred by reason of willful misfeasance, bad faith or negligence in the performance of duties hereunder or by reason of reckless disregard of obligations and duties hereunder as a result of a breach of the Trustee’s obligations under Article X hereof. The Master Servicer agrees to indemnify the Trustee, from, and hold it harmless against, any loss, liability or expense arising in respect of any breach by the Master Servicer of its obligations in connection with this Agreement. Such indemnity shall survive the termination or discharge of this Agreement and the resignation or removal of the Trustee. Any payment hereunder made by the Master Servicer to the Trustee shall be from the Master Servicer’s own funds, without reimbursement from REMIC I therefor. Notwithstanding anything herein to the contrary, the Trustee shall be reimbursed from the Trust Fund for all Servicing Transfer Costs without regard to the annual limitation.

Section 8.06.

Eligibility Requirements for Trustee.

The Trustee hereunder shall at all times be a corporation or an association (other than the Depositor, the Originator, the Seller, the Master Servicer or any Affiliate of the foregoing) organized and doing business under the laws of any state or the United States of America, authorized under such laws to exercise corporate trust powers, having a combined capital and surplus of at least $50,000,000 (or a member of a bank holding company whose capital and surplus is at least $50,000,000) and subject to supervision or examination by federal or state authority. If such corporation or association publishes reports of conditions at least annually, pursuant to law or to the requirements of the aforesaid supervising or examining authority, then for the purposes of this Section the combined capital and surplus of such corporation or association shall be deemed to be its combined capital and surplus as set forth in its most recent report of conditions so published. In case at any time the Trustee shall cease to be eligible in accordance with the provisions of this Section, the Trustee shall resign immediately in the manner and with the effect specified in Section 8.07.

Section 8.07.

Resignation and Removal of the Trustee.

The Trustee may at any time resign and be discharged from the trust hereby created by giving written notice thereof to the Depositor, the NIMS Insurer, the Master Servicer and to the Certificateholders. Upon receiving such notice of resignation, the Depositor shall promptly appoint a successor trustee acceptable to the NIMS Insurer by written instrument, in duplicate, which instrument shall be delivered to the resigning Trustee and to the successor trustee. A copy of such instrument shall be delivered to the Certificateholders, the Trustee and the Master Servicer by the Depositor. If no successor trustee shall have been so appointed and have accepted appointment within 30 days after the giving of such notice of resignation, the resigning Trustee may petition any court of competent jurisdiction for the appointment of a successor trustee.

If at any time the Trustee shall cease to be eligible in accordance with the provisions of Section 8.06 and shall fail to resign after written request therefor by the Depositor or the NIMS Insurer, or if at any time the Trustee shall become incapable of acting, or shall be adjudged bankrupt or insolvent, or a receiver of the Trustee or of its property shall be appointed, or any public officer shall take charge or control of the Trustee or of its property or affairs for the purpose of rehabilitation, conservation or liquidation, then the Depositor or the NIMS Insurer

may remove the and appoint a successor trustee acceptable to the NIMS Insurer by written instrument, in duplicate, which instrument shall be delivered to the Trustee so removed and to the successor trustee. A copy of such instrument shall be delivered to the Certificateholders, the Trustee and the Master Servicer by the Depositor.

The Holders of Certificates entitled to at least 51% of the Voting Rights (or the NIMS Insurer upon failure of the Trustee to perform its obligations hereunder) may at any time remove the Trustee and appoint a successor trustee acceptable to the NIMS Insurer by written instrument or instruments, in triplicate, signed by such Holders or their attorneys-in-fact duly authorized, one complete set of which instruments shall be delivered to the Depositor, one complete set to the Trustee so removed and one complete set to the successor so appointed. A copy of such instrument shall be delivered to the Certificateholders and the Master Servicer by the Depositor.

Any resignation or removal of the Trustee and appointment of a successor trustee, pursuant to any of the provisions of this Section shall not become effective until acceptance of appointment by the successor trustee as provided in Section 8.08. Notwithstanding the foregoing, in the event the Trustee is unable to continue to perform its obligations pursuant to the terms of this Agreement prior to the appointment of a successor, the Trustee shall be obligated to perform such obligations until a new trustee is appointed. Such performance shall be without prejudice to any claim by a party hereto or beneficiary hereof resulting from the Trustee’s breach of its obligations hereunder.

Section 8.08.

Successor Trustee.

Any successor trustee appointed as provided in Section 8.07 shall execute, acknowledge and deliver to the Depositor, the NIMS Insurer and its predecessor trustee an instrument accepting such appointment hereunder, and thereupon the resignation or removal of the predecessor trustee shall become effective and such successor trustee, without any further act, deed or conveyance, shall become fully vested with all the rights, powers, duties and obligations of its predecessor hereunder, with the like effect as if originally named as trustee herein. The predecessor trustee shall deliver to the successor trustee all Mortgage Files and related documents and statements to the extent held by it hereunder, as well as all moneys, held by it hereunder, and the Depositor and the predecessor trustee shall execute and deliver such instruments and do such other things as may reasonably be required for more fully and certainly vesting and confirming in the successor trustee all such rights, powers, duties and obligations.

No successor trustee shall accept appointment as provided in this Section unless at the time of such acceptance such successor trustee shall be eligible under the provisions of Section 8.06 and the appointment of such successor trustee shall not result in a downgrading of any Class of Certificates by any Rating Agency, as evidenced by a letter from each Rating Agency.

Upon acceptance of appointment by a successor trustee, as provided in this Section, the Depositor shall mail notice of the succession of such trustee hereunder to all Holders of Certificates at their addresses as shown in the Certificate Register. If the Depositor fails to

mail such notice within 10 days after acceptance of appointment by the successor trustee, the successor trustee shall cause such notice to be mailed at the expense of the Depositor.

Section 8.09.

Merger or Consolidation of Trustee.

Any corporation or association into which either the Trustee may be merged or converted or with which it may be consolidated or any corporation or association resulting from any merger, conversion or consolidation to which the Trustee shall be a party, or any corporation or association succeeding to the business of the Trustee shall be the successor of the Trustee hereunder, provided such corporation or association shall be eligible under the provisions of Section 8.06, without the execution or filing of any paper or any further act on the part of any of the parties hereto, anything herein to the contrary notwithstanding.

Section 8.10.

Appointment of Co-Trustee or Separate Trustee.

Notwithstanding any other provisions hereof, at any time, for the purpose of meeting any legal requirements of any jurisdiction in which any part of REMIC I or property securing the same may at the time be located, the Trustee shall have the power and shall execute and deliver all instruments to appoint one or more Persons approved by the Trustee and the NIMS Insurer to act as co-trustee or co-trustees, jointly with the Trustee, or separate trustee or separate trustees, of all or any part of REMIC I, and to vest in such Person or Persons, in such capacity, such title to REMIC I, or any part thereof, and, subject to the other provisions of this Section 8.10, such powers, duties, obligations, rights and trusts as the Trustee may consider necessary or desirable. Any such co-trustee or separate trustee shall be subject to the written approval of the NIMS Insurer. If the NIMS Insurer shall not have joined in such appointment within 15 days after the receipt by it of a request to do so, the Trustee alone shall have the power to make such appointment. No co-trustee or separate trustee hereunder shall be required to meet the terms of eligibility as a successor trustee under Section 8.06 hereunder and no notice to Holders of Certificates of the appointment of co-trustee(s) or separate trustee(s) shall be required under Section 8.08 hereof.

In the case of any appointment of a co-trustee or separate trustee pursuant to this Section 8.10 all rights, powers, duties and obligations conferred or imposed upon the Trustee shall be conferred or imposed upon and exercised or performed by the Trustee and such separate trustee or co-trustee jointly, except to the extent that under any law of any jurisdiction in which any particular act or acts are to be performed by the Trustee (whether as Trustee hereunder or as successor to a defaulting Master Servicer hereunder), the Trustee shall be incompetent or unqualified to perform such act or acts, in which event such rights, powers, duties and obligations (including the holding of title to REMIC I or any portion thereof in any such jurisdiction) shall be exercised and performed by such separate trustee or co-trustee at the direction of the Trustee.

Any notice, request or other writing given to the Trustee shall be deemed to have been given to each of the then separate trustees and co-trustees, as effectively as if given to each of them. Every instrument appointing any separate trustee or co-trustee shall refer to this Agreement and the conditions of this Article VIII. Each separate trustee and co-trustee, upon its acceptance of the trust conferred, shall be vested with the estates or property specified in its

instrument of appointment, either jointly with the Trustee, or separately, as may be provided therein, subject to all the provisions of this Agreement, specifically including every provision of this Agreement relating to the conduct of, affecting the liability of, or affording protection to, the Trustee. Every such instrument shall be filed with the Trustee and a copy thereof given to the NIMS Insurer.

Any separate trustee or co-trustee may, at any time, constitute the Trustee, its agent or attorney-in-fact, with full power and authority, to the extent not prohibited by law, to do any lawful act under or in respect of this Agreement on its behalf and in its name. If any separate trustee or co-trustee shall die, become incapable of acting, resign or be removed, all of its estates, properties, rights, remedies and trusts shall vest in and be exercised by the Trustee, to the extent permitted by law, without the appointment of a new or successor trustee or co-trustee.

Section 8.11.

Appointment of Office or Agency.

The Trustee will appoint an office or agency in the City of Minneapolis, Minnesota where the Certificates may be surrendered for registration of transfer or exchange, and presented for final distribution, and where notices and demands to or upon the Trustee in respect of the Certificates and this Agreement may be served.

Section 8.12.

Representations and Warranties.

The Trustee hereby represents and warrants to the Master Servicer and the Depositor, as of the Closing Date, that:

(i) It is a national banking association duly organized, validly existing and in good standing under the laws of the United States of America.

(ii) The execution and delivery of this Agreement by it, and the performance and compliance with the terms of this Agreement by it, will not violate its articles of association or bylaws or constitute a default (or an event which, with notice or lapse of time, or both, would constitute a default) under, or result in the breach of, any material agreement or other instrument to which it is a party or which is applicable to it or any of its assets.

(iii) It has the full power and authority to enter into and consummate all transactions contemplated by this Agreement, has duly authorized the execution, delivery and performance of this Agreement, and has duly executed and delivered this Agreement.

(iv) This Agreement, assuming due authorization, execution and delivery by the other parties hereto, constitutes a valid, legal and binding obligation of it, enforceable against it in accordance with the terms hereof, subject to (A) applicable bankruptcy, insolvency, receivership, reorganization, moratorium and other laws affecting the enforcement of creditors’ rights generally, and (B) general principles of equity, regardless of whether such enforcement is considered in a proceeding in equity or at law.

(v) It is not in violation of, and its execution and delivery of this Agreement and its performance and compliance with the terms of this Agreement will not constitute a violation of, any law, any order or decree of any court or arbiter, or any order, regulation or demand of any federal, state or local governmental or regulatory authority, which violation, in its good faith and reasonable judgment, is likely to affect materially and adversely either the ability of it to perform its obligations under this Agreement or its financial condition.

(vi) No litigation is pending or, to the best of its knowledge, threatened against it, which would prohibit it from entering into this Agreement or, in its good faith reasonable judgment, is likely to materially and adversely affect either the ability of it to perform its obligations under this Agreement or its financial condition.

ARTICLE IX

TERMINATION

Section 9.01.

Termination Upon Repurchase or Liquidation of All Mortgage Loans.

(a) Subject to Section 9.02, the respective obligations and responsibilities under this Agreement of the Depositor, the Master Servicer and the Trustee (other than the obligations of the Master Servicer to the Trustee pursuant to Section 8.05 and of the Master Servicer to make remittances to the Trustee and the Trustee to make payments in respect of the REMIC I Regular Interests and the Classes of Certificates as hereinafter set forth) shall terminate upon payment to the Certificateholders and the deposit of all amounts held by or on behalf of the Trustee and required hereunder to be so paid or deposited on the Distribution Date coinciding with or following the earlier to occur of (i) the purchase by the Terminator (as defined below) of all Mortgage Loans and each REO Property remaining in REMIC I and (ii) the final payment or other liquidation (or any advance with respect thereto) of the last Mortgage Loan or REO Property remaining in REMIC I; provided, however, that in no event shall the trust created hereby continue beyond the expiration of 21 years from the death of the last survivor of the descendants of Joseph P. Kennedy, the late ambassador of the United States to the Court of St. James, living on the date hereof. Subject to Section 3.10 hereof, the purchase by the Terminator of all Mortgage Loans and each REO Property remaining in REMIC I shall be at a price (the “Termination Price”) equal to the aggregate fair market value of all of the assets of REMIC I (as determined by the Terminator and the Trustee, as of the close of business on the third Business Day next preceding the date upon which notice of any such termination is furnished to Certificateholders pursuant to the third paragraph of this Section 9.01) plus accrued and unpaid interest thereon at the weighted average of the Mortgage Rates through the end of the Due Period preceding the final Distribution Date plus unreimbursed Servicing Advances, Advances, any unpaid Servicing Fees allocable to such Mortgage Loans and REO Properties and any accrued and unpaid Net WAC Rate Carryover Amount; provided, however, such option may only be exercised if (i) the Termination Price is sufficient to pay all interest accrued on, as well as amounts necessary to retire the principal balance of, each class of notes issued pursuant to the Indenture and any remaining amounts owed to the trustee under the Indenture and the NIMS Insurer on the date such option is exercised and (ii) the fair market value of the Mortgage Loans and REO Properties determined as described above is at least equal to the Principal Balance of the Mortgage Loans (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and the appraised value of the REO Properties. Notwithstanding the foregoing, if the condition set forth in clause (i) above is satisfied but the condition set forth in clause (ii) above is not satisfied, then if the Terminator is the Master Servicer or the NIMS Insurer, such Terminator may nevertheless exercise such option by paying a higher Termination Price equal to the Principal Balance of the Mortgage Loans (after giving effect to scheduled payments of principal due during the related Due Period, to the extent received or advanced, and unscheduled collections of principal received during the related Prepayment Period) and the appraised value of the REO Properties plus accrued and unpaid interest thereon at the weighted average of the Mortgage Rates through the end of the Due Period

preceding the final Distribution Date plus unreimbursed Servicing Advances, Advances, any unpaid Servicing Fees allocable to such Mortgage Loans and REO Properties and any accrued and unpaid Net WAC Rate Carryover Amount, provided that the payment of such higher Termination Price is not prohibited by any regulatory institution under whose supervision such Terminator may be conducting its business at such time.

(b) The majority holder of the Class CE Certificates (so long as such holder is not an affiliate of the Seller) or if such majority holder fails to exercise such right, the NIMS Insurer shall have the right (the party exercising such right, the “Terminator”), to purchase all of the Mortgage Loans and each REO Property remaining in REMIC I pursuant to clause (i) of the preceding paragraph no later than the Determination Date in the month immediately preceding the Distribution Date on which the Certificates will be retired; provided, however, that the Terminator may elect to purchase all of the Mortgage Loans and each REO Property remaining in REMIC I pursuant to clause (i) above only if the aggregate Stated Principal Balance of the Mortgage Loans and each REO Property remaining in the Trust Fund at the time of such election is reduced to less than 10% of the aggregate Stated Principal Balance of the Mortgage Loans as of the Cut-off Date. By acceptance of the Residual Certificates, the Holder of the Residual Certificates agrees for so long as any notes insured by the NIMS Insurer and secured by all or a portion of the Class CE, Class P or Class R Certificates are outstanding, in connection with any termination hereunder, to assign and transfer any amounts in excess of par, and to the extent received in respect of such termination, to pay any such amounts to the Holders of the Class CE Certificates.

(c) Notice of the liquidation of the Certificates shall be given promptly by the Trustee by letter to Certificateholders and the NIMS Insurer mailed (a) in the event such notice is given in connection with the purchase of the Mortgage Loans and each REO Property by the Terminator, not earlier than the 10^th day and not later than the 20^th day of the month next preceding the month of the final distribution on the Certificates or (b) otherwise during the month of such final distribution on or before the Determination Date in such month, in each case specifying (i) the Distribution Date upon which the Trust Fund will terminate and the final payment in respect of the REMIC I Regular Interests and the Certificates will be made upon presentation and surrender of the related Certificates at the office of the Trustee therein designated, (ii) the amount of any such final payment, (iii) that no interest shall accrue in respect of the REMIC I Regular Interests or the Certificates from and after the Accrual Period relating to the final Distribution Date therefor and (iv) that the Record Date otherwise applicable to such Distribution Date is not applicable, payments being made only upon presentation and surrender of the Certificates at the office of the Trustee. In the event such notice is given in connection with the purchase of all of the Mortgage Loans and each REO Property remaining in REMIC I by the Terminator, the Terminator shall deliver to the Trustee for deposit in the Distribution Account not later than the last Business Day of the month next preceding the month of the final distribution on the Certificates an amount in immediately available funds equal to the Termination Price. The Trustee shall remit to the Master Servicer from such funds deposited in the Distribution Account (i) any amounts which the Master Servicer would be permitted to withdraw and retain from the Collection Account pursuant to Section 3.11 and (ii) any other amounts otherwise payable by the Trustee to the Master Servicer from amounts on deposit in the Distribution Account pursuant to the terms of this Agreement, in each case prior to making any

final distributions pursuant to Section 10.01(d) below. Upon certification to the Trustee by the Terminator of the making of such final deposit, the Trustee shall promptly release to the Terminator the Mortgage Files for the remaining Mortgage Loans, and the Trustee shall execute all assignments, endorsements and other instruments necessary to effectuate such transfer.

(d) Upon presentation of the Certificates by the Certificateholders on the final Distribution Date, the Trustee shall distribute to each Certificateholder so presenting and surrendering its Certificates the amount otherwise distributable on such Distribution Date in accordance with Section 4.01 in respect of the Certificates so presented and surrendered. Any funds not distributed to any Holder or Holders of Certificates being retired on such Distribution Date because of the failure of such Holder or Holders to tender their Certificates shall, on such date, be set aside and held in trust and credited to the account of the appropriate non-tendering Holder or Holders. If any Certificates as to which notice has been given pursuant to this Section 9.01 shall not have been surrendered for cancellation within six months after the time specified in such notice, the Trustee shall mail a second notice to the remaining non-tendering Certificateholders to surrender their Certificates for cancellation in order to receive the final distribution with respect thereto. If within one year after the second notice all such Certificates shall not have been surrendered for cancellation, the Trustee shall, directly or through an agent, mail a final notice to the remaining non-tendering Certificateholders concerning surrender of their Certificates. The costs and expenses of maintaining the funds in trust and of contacting such Certificateholders shall be paid out of the assets remaining in the Trust Fund. If within one year after the final notice any such Certificates shall not have been surrendered for cancellation, the Trustee shall pay to UBS Securities LLC all such amounts, and all rights of non-tendering Certificateholders in or to such amounts shall thereupon cease. No interest shall accrue or be payable to any Certificateholder on any amount held in trust by the Trustee as a result of such Certificateholder’s failure to surrender its Certificate(s) for final payment thereof in accordance with this Section 9.01. Any such amounts held in trust by the Trustee shall be held in an Eligible Account and the Trustee may direct any depository institution maintaining such account to invest the funds in one or more Permitted Investments. All income and gain realized from the investment of funds deposited in such accounts held in trust by the Trustee shall be for the benefit of the Trustee; provided, however, that the Trustee shall deposit in such account the amount of any loss of principal incurred in respect of any such Permitted Investment made with funds in such accounts immediately upon the realization of such loss.

Immediately following the deposit of funds in trust hereunder in respect of the Certificates, the Trust Fund shall terminate.

Section 9.02.

Additional Termination Requirements.

(a) In the event that the Terminator purchases all the Mortgage Loans and each REO Property or the final payment on or other liquidation of the last Mortgage Loan or REO Property remaining in REMIC I pursuant to Section 9.01, the Trust Fund shall be terminated in accordance with the following additional requirements:

(i) The Trustee shall specify the first day in the 90-day liquidation period in a statement attached to each Trust REMIC’s final Tax Return pursuant to Treasury regulation Section 1.860F-1 and shall satisfy all requirements of a qualified liquidation

under Section 860F of the Code and any regulations thereunder, as evidenced by an Opinion of Counsel obtained at the expense of the Terminator;

(ii) During such 90-day liquidation period and, at or prior to the time of making of the final payment on the Certificates, the Trustee shall sell all of the assets of REMIC I to the Terminator for cash; and

(iii) At the time of the making of the final payment on the Certificates, the Trustee shall distribute or credit, or cause to be distributed or credited, to the Holders of the Residual Certificates all cash on hand in the Trust Fund (other than cash retained to meet claims), and the Trust Fund shall terminate at that time.

(b) At the expense of the requesting Terminator, the Depositor shall prepare or cause to be prepared the documentation required in connection with the adoption of a plan of liquidation of each Trust REMIC pursuant to this Section 9.02.

(c) By their acceptance of Certificates, the Holders thereof hereby agree to authorize the Trustee to specify the 90-day liquidation period for each Trust REMIC, which authorization shall be binding upon all successor Certificateholders.

ARTICLE X

REMIC PROVISIONS

Section 10.01.

REMIC Administration.

(a) The Trustee shall elect to treat each Trust REMIC as a REMIC under the Code and, if necessary, under applicable state law. Each such election will be made by the Trustee on Form 1066 or other appropriate federal tax or information return or any appropriate state return for the taxable year ending on the last day of the calendar year in which the Certificates are issued. For the purposes of the REMIC election in respect of REMIC I, the REMIC I Regular Interests shall be designated as the Regular Interests in REMIC I and the Class R-I Interest shall be designated as the Residual Interest in REMIC I. The Class A Certificates and the Mezzanine Certificates (exclusive of any right to receive payments from the Net WAC Rate Carryover Reserve Account), the Class CE Interest and the Class P Interest shall be designated as the Regular Interests in REMIC II and the Class R-II Interest shall be designated as the Residual Interest in REMIC II. The CE Certificates shall be designated as the Regular Interests in REMIC III and the Class R-III Interest shall be designated as the Residual Interest in REMIC III. The P Certificates shall be designated as the Regular Interests in REMIC IV and the Class R-IV Interest shall be designated as the Residual Interest in REMIC IV. The Trustee shall not permit the creation of any “interests” in any Trust REMIC (within the meaning of Section 860G of the Code) other than the REMIC I Regular Interests, the Class CE Interest, the Class P Interest and the interests represented by the Certificates.

(b) The Closing Date is hereby designated as the “Startup Day” of each Trust REMIC within the meaning of Section 860G(a)(9) of the Code.

(c) The Trustee shall be reimbursed for any and all expenses relating to any tax audit of the Trust Fund (including, but not limited to, any professional fees or any administrative or judicial proceedings with respect to any Trust REMIC that involve the Internal Revenue Service or state tax authorities), including the expense of obtaining any tax related Opinion of Counsel except as specified herein. The Trustee, as agent for each Trust REMIC’s tax matters person shall (i) act on behalf of the Trust Fund in relation to any tax matter or controversy involving any Trust REMIC and (ii) represent the Trust Fund in any administrative or judicial proceeding relating to an examination or audit by any governmental taxing authority with respect thereto. The holder of the largest Percentage Interest of the Residual Certificates shall be designated, in the manner provided under Treasury regulations section 1.860F-4(d) and Treasury regulations section 301.6231(a)(7)-1, as the tax matters person of the related REMIC created hereunder. By their acceptance thereof, the holder of the largest Percentage Interest of the Residual Certificates hereby agrees to irrevocably appoint the Trustee or an Affiliate as its agent to perform all of the duties of the tax matters person for the Trust Fund.

(d) The Trustee shall prepare, sign and file all of the Tax Returns (including Form 8811, which must be filed within 30 days following the Closing Date) in respect of each Trust REMIC. The expenses of preparing and filing such returns shall be borne by the Trustee without any right of reimbursement therefor.

(e) The Trustee shall perform on behalf of each Trust REMIC all reporting and other tax compliance duties that are the responsibility of such REMIC under the Code, the REMIC Provisions or other compliance guidance issued by the Internal Revenue Service or any state or local taxing authority. Among its other duties, as required by the Code, the REMIC Provisions or other such compliance guidance, the Trustee shall provide (i) to any Transferor of a Residual Certificate such information as is necessary for the application of any tax relating to the transfer of a Residual Certificate to any Person who is not a Permitted Transferee, (ii) to the Certificateholders such information or reports as are required by the Code or the REMIC Provisions including reports relating to interest, original issue discount and market discount or premium (using the prepayment assumption as required) and (iii) to the Internal Revenue Service the name, title, address and telephone number of the person who will serve as the representative of each Trust REMIC. The Depositor shall provide or cause to be provided to the Trustee, within ten (10) days after the Closing Date, all information or data that the Trustee reasonably determines to be relevant for tax purposes as to the valuations and issue prices of the Certificates, including, without limitation, the price, yield, prepayment assumption and projected cash flow of the Certificates.

(f) The Trustee shall take such action and shall cause each Trust REMIC to take such action as shall be necessary to create or maintain the status thereof as a REMIC under the REMIC Provisions. The Trustee shall not take any action or cause the Trust Fund to take any action or fail to take (or fail to cause to be taken) any action that, under the REMIC Provisions, if taken or not taken, as the case may be, could (i) endanger the status of any Trust REMIC as a REMIC or (ii) result in the imposition of a tax upon the Trust Fund (including but not limited to the tax on prohibited transactions as defined in Section 860F(a)(2) of the Code and the tax on contributions to a REMIC set forth in Section 860G(d) of the Code) (either such event, an “Adverse REMIC Event”) unless the Trustee and the NIMS Insurer has received an Opinion of Counsel, addressed to the Trustee (at the expense of the party seeking to take such action but in no event at the expense of the Trustee) to the effect that the contemplated action will not, with respect to any Trust REMIC, endanger such status or result in the imposition of such a tax, nor shall the Master Servicer take or fail to take any action (whether or not authorized hereunder) as to which the Trustee and the NIMS Insurer has advised it in writing that it has received an Opinion of Counsel to the effect that an Adverse REMIC Event could occur with respect to such action; provided that the Master Servicer may conclusively rely on such Opinion of Counsel and shall incur no liability for its action or failure to act in accordance with such Opinion of Counsel. In addition, prior to taking any action with respect to any Trust REMIC or the respective assets of each, or causing any Trust REMIC to take any action, which is not contemplated under the terms of this Agreement, the Master Servicer will consult with the Trustee, the NIMS Insurer or its designee, in writing, with respect to whether such action could cause an Adverse REMIC Event to occur with respect to any Trust REMIC and the Master Servicer shall not take any such action or cause any Trust REMIC to take any such action as to which the Trustee or the NIMS Insurer has advised it in writing that an Adverse REMIC Event could occur; provided that the Master Servicer may conclusively rely on such writing and shall incur no liability for its action or failure to act in accordance with such writing. The Trustee or the NIMS Insurer may consult with counsel to make such written advice, and the cost of same shall be borne by the party seeking to take the action not permitted by this Agreement, but in no event shall such cost be an expense of the Trustee. At all times as may be required by the Code, the Trustee will ensure that

substantially all of the assets of REMIC I will consist of “qualified mortgages” as defined in Section 860G(a)(3) of the Code and “permitted investments” as defined in Section 860G(a)(5) of the Code, to the extent such obligations are within the Trustee’s control and not otherwise inconsistent with the terms of this Agreement.

(g) In the event that any tax is imposed on “prohibited transactions” of any REMIC created hereunder as defined in Section 860F(a)(2) of the Code, on the “net income from foreclosure property” of such REMIC as defined in Section 860G(c) of the Code, on any contributions to any such REMIC after the Startup Day therefor pursuant to Section 860G(d) of the Code, or any other tax is imposed by the Code or any applicable provisions of state or local tax laws, such tax shall be charged (i) to the Trustee pursuant to Section 10.03 hereof, if such tax arises out of or results from a breach by the Trustee of any of its obligations under this Article X, (ii) to the Master Servicer pursuant to Section 10.03 hereof, if such tax arises out of or results from a breach by the Master Servicer of any of its obligations under Article III or this Article X, or (iii) against amounts on deposit in the Distribution Account and shall be paid by withdrawal therefrom.

(h) On or before April 15^th of each calendar year, commencing April 15, 2006, the Trustee shall deliver to each Rating Agency and the NIMS Insurer an Officer’s Certificate of the Trustee stating the Trustee’s compliance with this Article X (without regard to any action taken by any party other than the Trustee).

(i) The Trustee shall, for federal income tax purposes, maintain books and records with respect to each Trust REMIC on a calendar year and on an accrual basis.

(j) Following the Startup Day, neither the Master Servicer nor the Trustee shall accept any contributions of assets to any Trust REMIC other than in connection with any Qualified Substitute Mortgage Loan delivered in accordance with Section 2.03 unless it shall have received an Opinion of Counsel to the effect that the inclusion of such assets in the Trust Fund will not cause the related REMIC to fail to qualify as a REMIC at any time that any Certificates are outstanding or subject such REMIC to any tax under the REMIC Provisions or other applicable provisions of federal, state and local law or ordinances.

(k) Neither the Trustee nor the Master Servicer shall enter into any arrangement by which any Trust REMIC will receive a fee or other compensation for services nor permit either REMIC to receive any income from assets other than “qualified mortgages” as defined in Section 860G(a)(3) of the Code or “permitted investments” as defined in Section 860G(a)(5) of the Code.

Section 10.02.

Prohibited Transactions and Activities.

None of the Depositor, the Master Servicer or the Trustee shall sell, dispose of or substitute for any of the Mortgage Loans (except in connection with (i) the foreclosure of a Mortgage Loan, including but not limited to, the acquisition or sale of a Mortgaged Property acquired by deed in lieu of foreclosure, (ii) the bankruptcy of REMIC I, (iii) the termination of REMIC I pursuant to Article IX of this Agreement, (iv) a substitution pursuant to Article II of this Agreement or (v) a purchase of Mortgage Loans pursuant to Article II or III of this

Agreement), nor acquire any assets for any Trust REMIC (other than REO Property acquired in respect of a defaulted Mortgage Loan), nor sell or dispose of any investments in the Collection Account or the Distribution Account for gain, nor accept any contributions to any Trust REMIC after the Closing Date (other than a Qualified Substitute Mortgage Loan delivered in accordance with Section 2.03), unless it has received an Opinion of Counsel, addressed to the Trustee and the NIMS Insurer (at the expense of the party seeking to cause such sale, disposition, substitution, acquisition or contribution but in no event at the expense of the Trustee) that such sale, disposition, substitution, acquisition or contribution will not (a) affect adversely the status of any Trust REMIC as a REMIC or (b) cause any Trust REMIC to be subject to a tax on “prohibited transactions” or “contributions” pursuant to the REMIC Provisions.

Section 10.03.

Master Servicer and Trustee Indemnification.

(a) In the event that any Trust REMIC fails to qualify as a REMIC, loses its status as a REMIC, or incurs federal, state or local taxes as a result of a prohibited transaction or prohibited contribution under the REMIC Provisions due to (i) the negligent performance by the Trustee of its duties and obligations set forth herein or (ii) any state, local or franchise taxes imposed upon the Trust Fund as a result of the location of the Trustee or any co-trustee, the Trustee shall indemnify the NIMS Insurer and the Trust Fund against any and all Losses resulting from such negligence, including, without limitation, any reasonable attorneys’ fees imposed on or incurred as a result of a breach of the Trustee’s or any co-trustee’s covenants; provided, however, that the Trustee shall not be liable for any such Losses attributable to the action or inaction of the Master Servicer, the Depositor or the Holder of such Residual Certificate, as applicable, nor for any such Losses resulting from misinformation provided by the Holder of such Residual Certificate on which the Trustee has relied. The foregoing shall not be deemed to limit or restrict the rights and remedies of the Holder of such Residual Certificate now or hereafter existing at law or in equity. Notwithstanding the foregoing, however, in no event shall the Trustee have any liability (1) for any action or omission that is taken in accordance with and in compliance with the express terms of, or which is expressly permitted by the terms of, this Agreement, (2) for any Losses other than arising out of a negligent performance by the Trustee of its duties and obligations set forth herein, and (3) for any special or consequential damages to Certificateholders (in addition to payment of principal and interest on the Certificates).

(b) In the event that any Trust REMIC fails to qualify as a REMIC, loses its status as a REMIC, or incurs federal, state or local taxes as a result of a prohibited transaction or prohibited contribution under the REMIC Provisions due to (i) the negligent performance by the Master Servicer of its duties and obligations set forth herein or (ii) any state, local or franchise taxes imposed upon the Trust Fund as a result of the location of the Master Servicer or any sub-servicer, the Master Servicer shall indemnify the NIMS Insurer, the Trustee and the Trust Fund against any and all losses, claims, damages, liabilities or expenses (“Losses”) resulting from such negligence, including, without limitation, any reasonable attorneys’ fees imposed on or incurred as a result of a breach of the Master Servicer’s or any sub-servicer’s covenants; provided, however, that the Master Servicer shall not be liable for any such Losses attributable to the action or inaction of the Trustee, the Depositor or the Holder of such Residual Certificate, as applicable, nor for any such Losses resulting from misinformation provided by the Holder of such Residual Certificate on which the Master Servicer has relied. The foregoing shall not be

deemed to limit or restrict the rights and remedies of the Holder of such Residual Certificate now or hereafter existing at law or in equity. Notwithstanding the foregoing, however, in no event shall the Master Servicer have any liability (1) for any action or omission that is taken in accordance with and in compliance with the express terms of, or which is expressly permitted by the terms of, this Agreement, (2) for any Losses other than arising out of a negligent performance by the Master Servicer of its duties and obligations set forth herein, and (3) for any special or consequential damages to Certificateholders (in addition to payment of principal and interest on the Certificates).

ARTICLE XI

MISCELLANEOUS PROVISIONS

Section 11.01.

Amendment.

This Agreement may be amended from time to time by the Depositor, the Master Servicer and the Trustee with the consent of the NIMS Insurer and without the consent of any of the Certificateholders, (i) to cure any ambiguity or defect, (ii) to correct, modify or supplement any provisions herein (including to give effect to the expectations of Certificateholders), or (iii) to make any other provisions with respect to matters or questions arising under this Agreement which shall not be inconsistent with the provisions of this Agreement, provided that such action shall not adversely affect in any material respect the interests of any Certificateholder as evidenced by either (i) an Opinion of Counsel delivered to the Master Servicer, the Trustee and the NIMS Insurer or (ii) confirmation from the Rating Agencies, delivered to the Master Servicer, the Trustee and the NIMS Insurer, that such amendment will not result in the reduction or withdrawal of the rating of any outstanding Class of Certificates. No amendment shall be deemed to adversely affect in any material respect the interests of any Certificateholder who shall have consented thereto, and no Opinion of Counsel shall be required to address the effect of any such amendment on any such consenting Certificateholder.

This Agreement may also be amended from time to time by the Depositor, the Master Servicer, the NIMS Insurer and the Trustee with the consent of the NIMS Insurer and the Holders of Certificates entitled to at least 66% of the Voting Rights for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of this Agreement or of modifying in any manner the rights of the Holders of Certificates; provided, however, that no such amendment shall (i) reduce in any manner the amount of, or delay the timing of, payments received on Mortgage Loans which are required to be distributed on any Certificate without the consent of the Holder of such Certificate, (ii) adversely affect in any material respect the interests of the Holders of any Class of Certificates (as evidenced by either (i) an Opinion of Counsel delivered to the Trustee and the NIMS Insurer or (ii) confirmation from the Rating Agencies, delivered to the Master Servicer, the Trustee and the NIMS Insurer, that such action will not result in the reduction or withdrawal of the rating of any outstanding Class of Certificates) in a manner, other than as described in (i), or (iii) modify the consents required by the immediately preceding clauses (i) and (ii) without the consent of the Holders of all Certificates then outstanding. Notwithstanding any other provision of this Agreement, for purposes of the giving or withholding of consents pursuant to this Section 11.01, Certificates registered in the name of the Depositor or the Master Servicer or any Affiliate thereof shall be entitled to Voting Rights with respect to matters affecting such Certificates.

Notwithstanding any contrary provision of this Agreement, neither the Trustee nor the NIMS Insurer shall consent to any amendment to this Agreement unless it shall have first received an Opinion of Counsel satisfactory to the NIMS Insurer to the effect that such amendment will not result in the imposition of any tax on any Trust REMIC pursuant to the REMIC Provisions or cause any Trust REMIC to fail to qualify as a REMIC at any time that any Certificates are outstanding.

Promptly after the execution of any such amendment the Trustee shall furnish a copy of such amendment to each Certificateholder and the NIMS Insurer.

It shall not be necessary for the consent of Certificateholders under this Section 11.01 to approve the particular form of any proposed amendment, but it shall be sufficient if such consent shall approve the substance thereof. The manner of obtaining such consents and of evidencing the authorization of the execution thereof by Certificateholders shall be subject to such reasonable regulations as the Trustee may prescribe.

The cost of any Opinion of Counsel to be delivered pursuant to this Section 11.01 shall be borne by the Person seeking the related amendment, but in no event shall such Opinion of Counsel be an expense of the Trustee.

The Trustee may, but shall not be obligated to enter into any amendment pursuant to this Section that affects its rights, duties and immunities under this Agreement or otherwise.

Section 11.02.

Recordation of Agreement; Counterparts.

To the extent permitted by applicable law, this Agreement is subject to recordation in all appropriate public offices for real property records in all the counties or other comparable jurisdictions in which any or all of the properties subject to the Mortgages are situated, and in any other appropriate public recording office or elsewhere, such recordation to be effected by the Master Servicer at the expense of the Certificateholders, but only upon direction of the Trustee accompanied by an Opinion of Counsel to the effect that such recordation materially and beneficially affects the interests of the Certificateholders.

For the purpose of facilitating the recordation of this Agreement as herein provided and for other purposes, this Agreement may be executed simultaneously in any number of counterparts, each of which counterparts shall be deemed to be an original, and such counterparts shall constitute but one and the same instrument.

Section 11.03.

Limitation on Rights of Certificateholders.

The death or incapacity of any Certificateholder shall not operate to terminate this Agreement or the Trust, nor entitle such Certificateholder’s legal representatives or heirs to claim an accounting or to take any action or proceeding in any court for a partition or winding up of the Trust Fund, nor otherwise affect the rights, obligations and liabilities of the parties hereto or any of them.

No Certificateholder shall have any right to vote (except as expressly provided for herein) or in any manner otherwise control the operation and management of the Trust, or the obligations of the parties hereto, nor shall anything herein set forth, or contained in the terms of any of the Certificates, be construed so as to constitute the Certificateholders from time to time as partners or members of an association; nor shall any Certificateholder be under any liability to any third person by reason of any action taken by the parties to this Agreement pursuant to any provision hereof.

No Certificateholder shall have any right by virtue of any provision of this Agreement to institute any suit, action or proceeding in equity or at law upon or under or with respect to this Agreement, unless such Holder previously shall have given to the Trustee a written notice of default and of the continuance thereof, as hereinbefore provided, and unless also the Holders of Certificates entitled to at least 25% of the Voting Rights shall have made written request upon the Trustee to institute such action, suit or proceeding in its own name as Trustee hereunder and shall have offered to the Trustee such reasonable indemnity as it may require against the costs, expenses and liabilities to be incurred therein or thereby, and the Trustee, for 15 days after its receipt of such notice, request and offer of indemnity, shall have neglected or refused to institute any such action, suit or proceeding. It is understood and intended, and expressly covenanted by each Certificateholder with every other Certificateholder and the Trustee, that no one or more Holders of Certificates shall have any right in any manner whatsoever by virtue of any provision of this Agreement to affect, disturb or prejudice the rights of the Holders of any other of such Certificates, or to obtain or seek to obtain priority over or preference to any other such Holder, or to enforce any right under this Agreement, except in the manner herein provided and for the equal, ratable and common benefit of all Certificateholders. For the protection and enforcement of the provisions of this Section, each and every Certificateholder and the Trustee shall be entitled to such relief as can be given either at law or in equity.

Section 11.04.

Governing Law.

This Agreement shall be construed in accordance with the laws of the State of New York and the obligations, rights and remedies of the parties hereunder shall be determined in accordance with such laws.

Section 11.05.

Notices.

All directions, demands and notices hereunder shall be in writing and shall be deemed to have been duly given when received if personally delivered at or mailed by first class mail, postage prepaid, or by express delivery service or delivered in any other manner specified herein, to (a) in the case of the Depositor, 1285 Avenue of the Americas, New York, New York 10019, Attention: Glenn McIntyre (telecopy number (212) 713-2080), or such other address or telecopy number as may hereafter be furnished to the Master Servicer, the NIMS Insurer and the Trustee in writing by the Depositor, (b) in the case of the Master Servicer, 3 Ada, Irvine California 92618, Attention: Debbie Lonergan (telecopy number: (949) 790-7401), or such other address or telecopy number as may hereafter be furnished to the Trustee, the NIMS Insurer and the Depositor in writing by the Master Servicer, (c) in the case of the Trustee, Wells Fargo Bank, N.A., P.O. Box 98, Columbia, Maryland 21046, Attention: Client Manager—MASTR 20004-OPT2, with a copy to Wells Fargo Bank, N.A.., 9062 Old Annapolis Road, Columbia, Maryland 21045-1951, Attention: MASTR Series 2005-OPT1, or such other address or telecopy number as may hereafter be furnished to the Depositor, the NIMS Insurer and the Master Servicer in writing by the Trustee and (d) in the case of the NIMS Insurer, if any, as applicable, (i) Radian Insurance Inc., 1601 Market Street, Philadelphia, Pennsylvania 19103, Attention: General Counsel and (ii) Financial Security Assurance Inc., 350 Park Avenue, New York, New York 10022, Attn: Transaction Oversight, or such other address or telecopy number as may hereafter be furnished to the Master Servicer, the Depositor and the Trustee in writing by the NIMS Insurer. Any

notice required or permitted to be given to a Certificateholder shall be given by first class mail, postage prepaid, at the address of such Holder as shown in the Certificate Register. Any notice so mailed within the time prescribed in this Agreement shall be conclusively presumed to have been duly given when mailed, whether or not the Certificateholder receives such notice. A copy of any notice required to be telecopied hereunder also shall be mailed to the appropriate party in the manner set forth above.

Section 11.06.

Severability of Provisions.

If any one or more of the covenants, agreements, provisions or terms of this Agreement shall be for any reason whatsoever held invalid, then such covenants, agreements, provisions or terms shall be deemed severable from the remaining covenants, agreements, provisions or terms of this Agreement and shall in no way affect the validity or enforceability of the other provisions of this Agreement or of the Certificates or the rights of the Holders thereof.

Section 11.07.

Notice to Rating Agencies and the NIMS Insurer.

The Trustee shall use its best efforts promptly to provide notice to the Rating Agencies and the NIMS Insurer with respect to each of the following of which it has actual knowledge:

First,

Any material change or amendment to this Agreement;

Second, The occurrence of any Master Servicer Event of Default that has not been cured or waived;

Third,

The resignation or termination of the Master Servicer or the Trustee;

Fourth, The repurchase or substitution of Mortgage Loans pursuant to or as contemplated by Section 2.03;

Fifth,

The final payment to the Holders of any Class of Certificates;

Sixth, Any change in the location of the Collection Account or the Distribution Account;

Seventh, Any event that would result in the inability of the Trustee to make advances regarding delinquent Mortgage Loans; and

Eighth, The filing of any claim under any Master Servicer’s blanket bond and errors and omissions insurance policy required by Section 3.14 or the cancellation or material modification of coverage under any such instrument.

In addition, the Trustee shall promptly furnish to each Rating Agency and the NIMS Insurer copies of each report to Certificateholders described in Section 4.02 and the Master Servicer shall promptly furnish to each Rating Agency copies of the following:

First,

Each annual statement as to compliance described in Section 3.20; and

Second, Each annual independent public accountants’ servicing report described in Section 3.21.

Any such notice pursuant to this Section 11.07 shall be in writing and shall be deemed to have been duly given if personally delivered at or mailed by first class mail, postage prepaid, or by express delivery service to Fitch Ratings, One State Street, 32^nd Floor, New York, New York 10004, Moody’s Investors Service Inc., 99 Church Street, New York, New York 10004 and Standard & Poor’s Ratings Services, a division of The McGraw-Hill Companies, Inc., 55 Water Street, New York, New York 10007 or such other addresses as the Rating Agencies may designate in writing to the parties hereto.

Section 11.08.

Article and Section References.

All article and section references used in this Agreement, unless otherwise provided, are to articles and sections in this Agreement.

Section 11.09.

Grant of Security Interest.

It is the express intent of the parties hereto that the conveyance of the Mortgage Loans by the Depositor to the Trustee, be, and be construed as, a sale of the Mortgage Loans by the Depositor and not a pledge of the Mortgage Loans to secure a debt or other obligation of the Depositor. However, in the event that, notwithstanding the aforementioned intent of the parties, the Mortgage Loans are held to be property of the Depositor, then, (a) it is the express intent of the parties that such conveyance be deemed a pledge of the Mortgage Loans by the Depositor to the Trustee to secure a debt or other obligation of the Depositor and (b)(1) this Agreement shall also be deemed to be a security agreement within the meaning of Articles 8 and 9 of the Uniform Commercial Code as in effect from time to time in the State of New York; (2) the conveyance provided for in Section 2.01 hereof shall be deemed to be a grant by the Depositor to the Trustee of a security interest in all of the Depositor’s right, title and interest in and to the Mortgage Loans and all amounts payable to the holders of the Mortgage Loans in accordance with the terms thereof and all proceeds of the conversion, voluntary or involuntary, of the foregoing into cash, instruments, securities or other property, including without limitation all amounts, other than investment earnings, from time to time held or invested in the Collection Account and the Distribution Account, whether in the form of cash, instruments, securities or other property; (3) the obligations secured by such security agreement shall be deemed to be all of the Depositor’s obligations under this Agreement, including the obligation to provide to the Certificateholders the benefits of this Agreement relating to the Mortgage Loans and the Trust Fund; and (4) notifications to persons holding such property, and acknowledgments, receipts or confirmations from persons holding such property, shall be deemed notifications to, or acknowledgments, receipts or confirmations from, financial intermediaries, bailees or agents (as applicable) of the Trustee for the purpose of perfecting such security interest under applicable law. Accordingly, the Depositor hereby grants to the Trustee a security interest in the Mortgage Loans and all other property described in clause (2) of the preceding sentence, for the purpose of securing to the Trustee the performance by the Depositor of the obligations described in clause (3) of the preceding sentence. Notwithstanding the foregoing, the parties hereto intend the conveyance pursuant to Section 2.01 to be a true, absolute and unconditional sale of the Mortgage Loans and assets constituting the Trust Fund by the Depositor to the Trustee.

Section 11.10.

Third Party Rights.

The NIMs Insurer shall be deemed a third-party beneficiary of this Agreement to the same extent as if it were a party hereto, and shall have the right to enforce the provisions of this Agreement.

IN WITNESS WHEREOF, the Depositor, the Master Servicer and the Trustee have caused their names to be signed hereto by their respective officers thereunto duly authorized, in each case as of the day and year first above written.

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC.,

as Depositor

By:

/s/ Steve Warjank

Name: Steve Warjank

Title: Director

By:

/s/ Glenn McIntyre

Name: Glenn McIntyre

Title: Director

OPTION ONE MORTGAGE CORPORATION

as Master Servicer

By:

/s/ Charles R. Fulton

Name: Charles R. Fulton

Title: Vice President

WELLS FARGO BANK, N.A, as Trustee

By:

/s/ Amy Doyle

Name: Amy Doyle

Title: Vice President

STATE OF NEW YORK	)
	)	ss.:
COUNTY OF NEW YORK	)

On the day of May 2005, before me, a notary public in and for said State, personally appeared ________________, known to me to be a ________________ of Mortgage Asset Securitization Transactions, Inc., one of the corporations that executed the within instrument, and also known to me to be the person who executed it on behalf of said corporation, and acknowledged to me that such corporation executed the within instrument.

IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official seal the day and year in this certificate first above written.


	Notary Public

[Notarial Seal]

STATE OF_____________	)
	)	ss.:
COUNTY OF___________	)

On the ____ day of May 2005, before me, a notary public in and for said State, personally appeared _____________________, known to me to be __________________ of Option One Mortgage Corporation, one of the corporations that executed the within instrument, and also known to me to be the person who executed it on behalf of said corporation, and acknowledged to me that such corporation executed the within instrument.

IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official seal the day and year in this certificate first above written.


	Notary Public

[Notarial Seal]

STATE OF_____________	)
	)	ss.:
COUNTY OF___________	)

On the ____ day of May 2005, before me, a notary public in and for said State, personally appeared ______________, known to me to be a ____________ of Wells Fargo Bank, N.A., one of the corporations that executed the within instrument, and also known to me to be the person who executed it on behalf of said corporation, and acknowledged to me that such corporation executed the within instrument.

IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official seal the day and year in this certificate first above written.


	Notary Public

[Notarial Seal]

EXHIBIT A-1

FORM OF CLASS A-1 CERTIFICATE

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE TRUSTEE OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

SOLELY FOR U.S. FEDERAL INCOME TAX PURPOSES, THIS CERTIFICATE IS A “REGULAR INTEREST” IN A “REAL ESTATE MORTGAGE INVESTMENT CONDUIT,” AS THOSE TERMS ARE DEFINED, RESPECTIVELY, IN SECTIONS 860G AND 860D OF THE INTERNAL REVENUE CODE OF 1986 (THE “CODE”).

Series: 2005-OPT1

Pass-Through Rate: Variable

Cut-off Date and date of Pooling and Servicing Agreement: May 1, 2005

First Distribution Date: June 27, 2005

No. 1

Aggregate Certificate Principal Balance of the Class A-1 Certificates as of the Issue Date: $666,810,000

Denomination: $666,810,000

Master Servicer: Option One Mortgage Corporation

Trustee: Wells Fargo Bank, N.A.

Issue Date: May 12, 2005

CUSIP: 57643L HJ 8

DISTRIBUTIONS IN REDUCTION OF THE CERTIFICATE PRINCIPAL BALANCE OF THIS CERTIFICATE MAY BE MADE MONTHLY AS SET FORTH HEREIN. ACCORDINGLY, THE OUTSTANDING CERTIFICATE PRINCIPAL BALANCE HEREOF AT ANY TIME MAY BE LESS THAN THE AMOUNT SHOWN ABOVE AS THE DENOMINATION OF THIS CERTIFICATE.

A-1-1

MORTGAGE PASS-THROUGH CERTIFICATE

evidencing a beneficial ownership interest in a portion of a Trust Fund (the “Trust Fund”) consisting primarily of a pool of conventional one- to four-family, fixed-rate and adjustable-rate, first and second lien mortgage loans (the “Mortgage Loans”) formed and sold by

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC.

THIS CERTIFICATE DOES NOT REPRESENT AN OBLIGATION OF OR INTEREST IN MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC., THE MASTER SERVICER, THE TRUSTEE OR ANY OF THEIR RESPECTIVE AFFILIATES. NEITHER THIS CERTIFICATE NOR THE UNDERLYING MORTGAGE LOANS ARE GUARANTEED BY ANY AGENCY OR INSTRUMENTALITY OF THE UNITED STATES.

This certifies that Cede & Co. is the registered owner of a Percentage Interest (obtained by dividing the denomination of this Certificate by the aggregate Certificate Principal Balance of the Class A-1 Certificates as of the Issue Date) in that certain beneficial ownership interest evidenced by all the Class A-1 Certificates in REMIC II created pursuant to a Pooling and Servicing Agreement, dated as specified above (the “Agreement”), among Mortgage Asset Securitization Transactions, Inc. (hereinafter called the “Depositor,” which term includes any successor entity under the Agreement), the Master Servicer and the Trustee, a summary of certain of the pertinent provisions of which is set forth hereafter. To the extent not defined herein, the capitalized terms used herein have the meanings assigned in the Agreement. This Certificate is issued under and is subject to the terms, provisions and conditions of the Agreement, to which Agreement the Holder of this Certificate by virtue of the acceptance hereof assents and by which such Holder is bound.

Pursuant to the terms of the Agreement, distributions will be made on the 25^th day of each month or, if such 25^th day is not a Business Day, the Business Day immediately following (a “Distribution Date”), commencing on the First Distribution Date specified above, to the Person in whose name this Certificate is registered on the Record Date, in an amount equal to the product of the Percentage Interest evidenced by this Certificate and the amount required to be distributed to the Holders of Class A-1 Certificates on such Distribution Date pursuant to the Agreement.

All distributions to the Holder of this Certificate under the Agreement will be made or caused to be made by the Trustee by wire transfer in immediately available funds to the account of the Person entitled thereto if such Person shall have so notified the Trustee in writing at least five Business Days prior to the Record Date immediately prior to such Distribution Date and is the registered owner of Class A-1 Certificates the aggregate initial Certificate Principal Balance of which is in excess of the lesser of (i) $5,000,000 or (ii) two-thirds of the aggregate initial Certificate Principal Balance of the Class A Certificates, or otherwise by check mailed by first class mail to the address of the Person entitled thereto, as such name and address shall appear on the Certificate Register. Notwithstanding the above, the final distribution on this Certificate will be made after due notice by the Trustee of the pendency of such distribution and only upon presentation and surrender of this Certificate at the office or agency appointed by the Trustee for that purpose as provided in the Agreement.

A-1-2

The Pass-Through Rate applicable to the calculation of interest payable with respect to this Certificate on any Distribution Date shall equal a rate per annum equal to the lesser of (i) the related Formula Rate for such Distribution Date and (ii) the related Net WAC Pass-Through Rate for such Distribution Date.

This Certificate is one of a duly authorized issue of Certificates designated as Mortgage Pass-Through Certificates of the Series specified on the face hereof (herein called the “Certificates”) and representing a Percentage Interest in the Class of Certificates specified on the face hereof equal to the denomination specified on the face hereof divided by the aggregate Certificate Principal Balance of the Class of Certificates specified on the face hereof.

The Certificates are limited in right of payment to certain collections and recoveries respecting the Mortgage Loans, all as more specifically set forth herein and in the Agreement. As provided in the Agreement, withdrawals from the Collection Account and the Distribution Account may be made from time to time for purposes other than distributions to Certificateholders, such purposes including reimbursement of advances made, or certain expenses incurred, with respect to the Mortgage Loans.

The Agreement permits, with certain exceptions therein provided, the amendment thereof and the modification of the rights and obligations of the Depositor, the Master Servicer, the Trustee and the rights of the Certificateholders under the Agreement at any time by the Depositor, the Master Servicer and the Trustee with the consent of the Holders of Certificates entitled to at least 66% of the Voting Rights. Any such consent by the Holder of this Certificate shall be conclusive and binding on such Holder and upon all future Holders of this Certificate and of any Certificate issued upon the transfer hereof or in exchange herefor or in lieu hereof whether or not notation of such consent is made upon this Certificate. The Agreement also permits the amendment thereof, in certain limited circumstances, without the consent of the Holders of any of the Certificates.

As provided in the Agreement and subject to certain limitations therein set forth, the transfer of this Certificate is registrable in the Certificate Register upon surrender of this Certificate for registration of transfer at the offices or agencies appointed by the Trustee as provided in the Agreement, duly endorsed by, or accompanied by an assignment in the form below or other written instrument of transfer in form satisfactory to the Trustee duly executed by, the Holder hereof or such Holder’s attorney duly authorized in writing, and thereupon one or more new Certificates of the same Class in authorized denominations evidencing the same aggregate Percentage Interest will be issued to the designated transferee or transferees.

The Certificates are issuable in fully registered form only without coupons in Classes and denominations representing Percentage Interests specified in the Agreement. As provided in the Agreement and subject to certain limitations therein set forth, the Certificates are exchangeable for new Certificates of the same Class in authorized denominations evidencing the same aggregate Percentage Interest, as requested by the Holder surrendering the same. No service charge will be made for any such registration of transfer or exchange of Certificates, but the Trustee may require payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection with any transfer or exchange of Certificates.

The Depositor, the Master Servicer, the Trustee and any agent of the Depositor, the Master Servicer or the Trustee may treat the Person in whose name this Certificate is

A-1-3

registered as the owner hereof for all purposes, and none of the Depositor, the Master Servicer, the Trustee nor any such agent shall be affected by notice to the contrary.

The obligations created by the Agreement and the Trust Fund created thereby shall terminate upon payment to the Certificateholders of all amounts held by the Trustee and required to be paid to them pursuant to the Agreement following the earlier of (i) the final payment or other liquidation (or any advance with respect thereto) of the last Mortgage Loan and REO Property remaining in REMIC I and (ii) the purchase by the party designated in the Agreement at a price determined as provided in the Agreement from REMIC I of all the Mortgage Loans and all property acquired in respect of such Mortgage Loans. The Agreement permits, but does not require, the party designated in the Agreement to purchase from REMIC I all the Mortgage Loans and all property acquired in respect of any Mortgage Loan at a price determined as provided in the Agreement. The exercise of such right will effect early retirement of the Certificates; however, such right to purchase is subject to the aggregate Stated Principal Balance of the Mortgage Loans at the time of purchase being less than 10% of the aggregate principal balance of the Mortgage Loans as of the Cut-off Date.

The recitals contained herein shall be taken as statements of the Depositor and the Trustee assumes no responsibility for their correctness.

Unless the certificate of authentication hereon has been executed by the Trustee, by manual signature, this Certificate shall not be entitled to any benefit under the Agreement or be valid for any purpose.

A-1-4

IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly executed.

Dated: May ____, 2005

MASTR ASSET BACKED SECURITIES
TRUST 2005-OPT1

WELLS FARGO BANK, N.A., not in its
individual capacity, but solely as Trustee

By:

Authorized Officer

CERTIFICATE OF AUTHENTICATION

This is one of the Certificates referred to in the within-mentioned Agreement.

WELLS FARGO BANK, N.A., as Trustee

By:

Authorized Signatory

A-1-5

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM - as tenants in common	UNIF GIFT MIN ACT - Custodian
TEN ENT - as tenants by the entireties	(Cust) (Minor) under Uniform Gifts to Minors Act
JT TEN - as joint tenants with right of survivorship and not as tenants in common	_________________ (State)

Additional abbreviations may also be used though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto _____________________________________________________________________________________

_____________________________________________________________________________________

(Please print or typewrite name, address including postal zip code, and Taxpayer Identification Number of assignee) a Percentage Interest equal to ____% evidenced by the within Asset Backed Pass-Through Certificates and hereby authorize(s) the registration of transfer of such interest to assignee on the Certificate Register of the Trust Fund.

I (we) further direct the Trustee to issue a new Certificate of a like Percentage Interest and Class to the above named assignee and deliver such Certificate to the following address: _____________________________________________________________________________.

_____________________________________________________________________________.

Dated:


	Signature by or on behalf of assignor


	Signature Guaranteed

A-1-6

DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately available funds to ___________________________________________________________________________ _______________________________________________________________ for the account of _______________________________, account number ______________________________, or, if mailed by check, to________________________________________________________

_____________________________________________________________________________.

Applicable statements should be mailed to ____________________________________. This information is provided by ___________________________________________, the assignee named above, or ________________________________________, as its agent.

A-1-7

EXHIBIT A-2

FORM OF CLASS A-2 CERTIFICATE

Series: 2005-OPT1

Pass-Through Rate: Variable

Cut-off Date and date of Pooling and Servicing Agreement: May 1, 2005

First Distribution Date: June 27, 2005

No. 1

Aggregate Certificate Principal Balance of the Class A-2 Certificates as of the Issue Date: $74,091,000

Denomination: $74,091,000

Master Servicer: Option One Mortgage Corporation

Trustee: Wells Fargo Bank, N.A.

Issue Date: May 12, 2005

CUSIP: 57643L HK 5

A-2-1

MORTGAGE PASS-THROUGH CERTIFICATE

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC.

This certifies that Cede & Co. is the registered owner of a Percentage Interest (obtained by dividing the denomination of this Certificate by the aggregate Certificate Principal Balance of the Class A-2 Certificates as of the Issue Date) in that certain beneficial ownership interest evidenced by all the Class A-2 Certificates in REMIC II created pursuant to a Pooling and Servicing Agreement, dated as specified above (the “Agreement”), among Mortgage Asset Securitization Transactions, Inc. (hereinafter called the “Depositor,” which term includes any successor entity under the Agreement), the Master Servicer and the Trustee, a summary of certain of the pertinent provisions of which is set forth hereafter. To the extent not defined herein, the capitalized terms used herein have the meanings assigned in the Agreement. This Certificate is issued under and is subject to the terms, provisions and conditions of the Agreement, to which Agreement the Holder of this Certificate by virtue of the acceptance hereof assents and by which such Holder is bound.

Pursuant to the terms of the Agreement, distributions will be made on the 25^th day of each month or, if such 25^th day is not a Business Day, the Business Day immediately following (a “Distribution Date”), commencing on the First Distribution Date specified above, to the Person in whose name this Certificate is registered on the Record Date, in an amount equal to the product of the Percentage Interest evidenced by this Certificate and the amount required to be distributed to the Holders of Class A-2 Certificates on such Distribution Date pursuant to the Agreement.

All distributions to the Holder of this Certificate under the Agreement will be made or caused to be made by the Trustee by wire transfer in immediately available funds to the account of the Person entitled thereto if such Person shall have so notified the Trustee in writing at least five Business Days prior to the Record Date immediately prior to such Distribution Date and is the registered owner of Class A-2 Certificates the aggregate initial Certificate Principal Balance of which is in excess of the lesser of (i) $5,000,000 or (ii) two-thirds of the aggregate initial Certificate Principal Balance of the Class A Certificates, or otherwise by check mailed by first class mail to the address of the Person entitled thereto, as such name and address shall appear on the Certificate Register. Notwithstanding the above, the final distribution on this Certificate will be made after due notice by the Trustee of the pendency of such distribution and only upon presentation and surrender of this Certificate at the office or agency appointed by the Trustee for that purpose as provided in the Agreement.

A-2-2

The Depositor, the Master Servicer, the Trustee and any agent of the Depositor, the Master Servicer or the Trustee may treat the Person in whose name this Certificate is

A-2-3

registered as the owner hereof for all purposes, and none of the Depositor, the Master Servicer, the Trustee nor any such agent shall be affected by notice to the contrary.

The recitals contained herein shall be taken as statements of the Depositor and the Trustee assumes no responsibility for their correctness.

A-2-4

IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly executed.

Dated: May ____, 2005

MASTR ASSET BACKED SECURITIES
TRUST 2005-OPT1

WELLS FARGO BANK, N.A., not in its
individual capacity, but solely as Trustee

By:

Authorized Officer

CERTIFICATE OF AUTHENTICATION

This is one of the Certificates referred to in the within-mentioned Agreement.

WELLS FARGO BANK, N.A., as Trustee

By:

Authorized Signatory

A-2-5

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM - as tenants in common	UNIF GIFT MIN ACT - Custodian
TEN ENT - as tenants by the entireties	(Cust) (Minor) under Uniform Gifts to Minors Act
JT TEN - as joint tenants with right of survivorship and not as tenants in common	_________________ (State)

Additional abbreviations may also be used though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto _____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________.

Dated:


	Signature by or on behalf of assignor


	Signature Guaranteed

A-2-6

DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately available funds

to ___________________________________________________________________________

_______________________________________________________________ for the account of

_______________________________, account number ______________________________,

or, if mailed by check, to________________________________________________________

_____________________________________________________________________________.

Applicable statements should be mailed to ____________________________________.

This information is provided by ___________________________________________, the

assignee named above, or ________________________________________, as its agent.

A-2-7

EXHIBIT A-3

FORM OF CLASS A-3 CERTIFICATE

Series: 2005-OPT1

Pass-Through Rate: Variable

Cut-off Date and date of Pooling and Servicing Agreement: May 1, 2005

First Distribution Date: June 27, 2005

No. 1

Aggregate Certificate Principal Balance of the Class A-3 Certificates as of the Issue Date: $316,612,000

Denomination: $316,612,000

Master Servicer: Option One Mortgage Corporation

Trustee: Wells Fargo Bank, N.A.

Issue Date: May 12, 2005

CUSIP: 57643L HL 3

A-3-1

MORTGAGE PASS-THROUGH CERTIFICATE

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC.

This certifies that Cede & Co. is the registered owner of a Percentage Interest (obtained by dividing the denomination of this Certificate by the aggregate Certificate Principal Balance of the Class A-3 Certificates as of the Issue Date) in that certain beneficial ownership interest evidenced by all the Class A-3 Certificates in REMIC II created pursuant to a Pooling and Servicing Agreement, dated as specified above (the “Agreement”), among Mortgage Asset Securitization Transactions, Inc. (hereinafter called the “Depositor,” which term includes any successor entity under the Agreement), the Master Servicer and the Trustee, a summary of certain of the pertinent provisions of which is set forth hereafter. To the extent not defined herein, the capitalized terms used herein have the meanings assigned in the Agreement. This Certificate is issued under and is subject to the terms, provisions and conditions of the Agreement, to which Agreement the Holder of this Certificate by virtue of the acceptance hereof assents and by which such Holder is bound.

Pursuant to the terms of the Agreement, distributions will be made on the 25^th day of each month or, if such 25^th day is not a Business Day, the Business Day immediately following (a “Distribution Date”), commencing on the First Distribution Date specified above, to the Person in whose name this Certificate is registered on the Record Date, in an amount equal to the product of the Percentage Interest evidenced by this Certificate and the amount required to be distributed to the Holders of Class A-3 Certificates on such Distribution Date pursuant to the Agreement.

All distributions to the Holder of this Certificate under the Agreement will be made or caused to be made by the Trustee by wire transfer in immediately available funds to the account of the Person entitled thereto if such Person shall have so notified the Trustee in writing at least five Business Days prior to the Record Date immediately prior to such Distribution Date and is the registered owner of Class A-3 Certificates the aggregate initial Certificate Principal Balance of which is in excess of the lesser of (i) $5,000,000 or (ii) two-thirds of the aggregate initial Certificate Principal Balance of the Class A Certificates, or otherwise by check mailed by first class mail to the address of the Person entitled thereto, as such name and address shall appear on the Certificate Register. Notwithstanding the above, the final distribution on this Certificate will be made after due notice by the Trustee of the pendency of such distribution and only upon presentation and surrender of this Certificate at the office or agency appointed by the Trustee for that purpose as provided in the Agreement.

A-3-2

A-3-3

The Depositor, the Master Servicer, the Trustee and any agent of the Depositor, the Master Servicer or the Trustee may treat the Person in whose name this Certificate is registered as the owner hereof for all purposes, and none of the Depositor, the Master Servicer, the Trustee nor any such agent shall be affected by notice to the contrary.

The recitals contained herein shall be taken as statements of the Depositor and the Trustee assumes no responsibility for their correctness.

A-3-4

IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly executed.

Dated: May ____, 2005

MASTR ASSET BACKED SECURITIES
TRUST 2005-OPT1

WELLS FARGO BANK, N.A., not in its
individual capacity, but solely as Trustee

By:

Authorized Officer

CERTIFICATE OF AUTHENTICATION

This is one of the Certificates referred to in the within-mentioned Agreement.

WELLS FARGO BANK, N.A., as Trustee

By:

Authorized Signatory

A-3-5

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM - as tenants in common	UNIF GIFT MIN ACT - Custodian
TEN ENT - as tenants by the entireties	(Cust) (Minor) under Uniform Gifts to Minors Act
JT TEN - as joint tenants with right of survivorship and not as tenants in common	_________________ (State)

Additional abbreviations may also be used though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto __________________________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________.

Dated:


	Signature by or on behalf of assignor


	Signature Guaranteed

A-3-6

DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately available funds to

___________________________________________________________________________

_______________________________________________________________ for the account of

_______________________________, account number ______________________________,

or, if mailed by check, to________________________________________________________

_____________________________________________________________________________.

Applicable statements should be mailed to ____________________________________.

This information is provided by ___________________________________________,

the assignee named above, or ________________________________________, as its agent.

A-3-7

EXHIBIT A-4

FORM OF CLASS A-4 CERTIFICATE

Series: 2005-OPT1

Pass-Through Rate: Variable

Cut-off Date and date of Pooling and Servicing Agreement: May 1, 2005

First Distribution Date: June 27, 2005

No. 1

Aggregate Certificate Principal Balance of the Class A-4 Certificates as of the Issue Date: $247,690,000

Denomination: $247,690,000

Master Servicer: Option One Mortgage Corporation

Trustee: Wells Fargo Bank, N.A.

Issue Date: May 12, 2005

CUSIP: 57643L HM 1

A-4-1

MORTGAGE PASS-THROUGH CERTIFICATE

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC.

This certifies that Cede & Co. is the registered owner of a Percentage Interest (obtained by dividing the denomination of this Certificate by the aggregate Certificate Principal Balance of the Class A-4 Certificates as of the Issue Date) in that certain beneficial ownership interest evidenced by all the Class A-4 Certificates in REMIC II created pursuant to a Pooling and Servicing Agreement, dated as specified above (the “Agreement”), among Mortgage Asset Securitization Transactions, Inc. (hereinafter called the “Depositor,” which term includes any successor entity under the Agreement), the Master Servicer and the Trustee, a summary of certain of the pertinent provisions of which is set forth hereafter. To the extent not defined herein, the capitalized terms used herein have the meanings assigned in the Agreement. This Certificate is issued under and is subject to the terms, provisions and conditions of the Agreement, to which Agreement the Holder of this Certificate by virtue of the acceptance hereof assents and by which such Holder is bound.

Pursuant to the terms of the Agreement, distributions will be made on the 25^th day of each month or, if such 25^th day is not a Business Day, the Business Day immediately following (a “Distribution Date”), commencing on the First Distribution Date specified above, to the Person in whose name this Certificate is registered on the Record Date, in an amount equal to the product of the Percentage Interest evidenced by this Certificate and the amount required to be distributed to the Holders of Class A-4 Certificates on such Distribution Date pursuant to the Agreement.

All distributions to the Holder of this Certificate under the Agreement will be made or caused to be made by the Trustee by wire transfer in immediately available funds to the account of the Person entitled thereto if such Person shall have so notified the Trustee in writing at least five Business Days prior to the Record Date immediately prior to such Distribution Date and is the registered owner of Class A-4 Certificates the aggregate initial Certificate Principal Balance of which is in excess of the lesser of (i) $5,000,000 or (ii) two-thirds of the aggregate initial Certificate Principal Balance of the Class A Certificates, or otherwise by check mailed by first class mail to the address of the Person entitled thereto, as such name and address shall appear on the Certificate Register. Notwithstanding the above, the final distribution on this Certificate will be made after due notice by the Trustee of the pendency of such distribution and only upon presentation and surrender of this Certificate at the office or agency appointed by the Trustee for that purpose as provided in the Agreement.

A-4-2

A-4-3

The recitals contained herein shall be taken as statements of the Depositor and the Trustee assumes no responsibility for their correctness.

A-4-4

IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly executed.

Dated: May ____, 2005

MASTR ASSET BACKED SECURITIES
TRUST 2005-OPT1

WELLS FARGO BANK, N.A., not in its
individual capacity, but solely as Trustee

By:

Authorized Officer

CERTIFICATE OF AUTHENTICATION

This is one of the Certificates referred to in the within-mentioned Agreement.

WELLS FARGO BANK, N.A., as Trustee

By:

Authorized Signatory

A-4-5

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM - as tenants in common	UNIF GIFT MIN ACT - Custodian
TEN ENT - as tenants by the entireties	(Cust) (Minor) under Uniform Gifts to Minors Act
JT TEN - as joint tenants with right of survivorship and not as tenants in common	_________________ (State)

Additional abbreviations may also be used though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto _____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________.

Dated:


	Signature by or on behalf of assignor


	Signature Guaranteed

A-4-6

MASTR Asset Backed Securities Trust 2005-OPT1 8-K