ASSIGNMENT AND ASSUMPTION AGREEMENT

This ASSIGNMENT AND ASSUMPTION AGREEMENT dated April 1, 2007 (this “Assignment Agreement”), is among Goldman Sachs Mortgage Company, a New York limited partnership (the “Assignor”), GS Mortgage Securities Corp., a Delaware corporation (the “Assignee”) and Residential Funding Company, LLC, a Delaware limited liability company (the “Company” or the “Servicer”).

WHEREAS, the Company sold to the Assignor, on a servicing retained basis, certain mortgage loans listed on the mortgage loan schedule attached as Schedule A hereto (the “Mortgage Loans”) pursuant to the Standard Terms and Provisions of Sale and Servicing Agreement dated as of September 29, 2005, as supplemented by the Reference Agreement dated as of February 9, 2007, and the Reference Agreement dated as of March 6, 2007 (the “Servicing Agreement”), by and between the Company and the Assignor;

WHEREAS, the Assignee has agreed on certain terms and conditions to purchase from the Assignor the Mortgage Loans, each of which Mortgage Loans is subject to the provisions of the Servicing Agreement; and

WHEREAS, pursuant to a Master Servicing and Trust Agreement dated as of April 1, 2007 (the “Trust Agreement”), among the Assignor, as depositor, Deutsche Bank National Trust Company, as trustee (the “Trustee”), Wells Fargo Bank, N.A. (“Wells Fargo”), as securities administrator and master servicer (the “Master Servicer”), and each of Deutsche Bank National Trust Company and U.S. Bank National Association, as custodians, the Assignee will transfer the Mortgage Loans to the Trustee, together with the Assignee’s rights in the Servicing Agreement related to the Mortgage Loans;

For and in consideration of the sum of TEN DOLLARS ($10.00) and other valuable consideration the receipt and sufficiency of which hereby are acknowledged, and of the mutual covenants herein contained, the parties hereto hereby agree as follows:

1. Assignment and Assumption.

a. With respect to the Mortgage Loans, the Assignor hereby grants, transfers and assigns to the Assignee all of the right, title and interest of the Assignor, as Owner, in, to and under the Servicing Agreement (other than the rights of the Assignor to indemnification thereunder) and the Mortgage Loans delivered thereunder by the Company to the Assignor.

b. The Assignor represents and warrants to the Assignee that the Assignor has not taken any action that would serve to impair or encumber the Assignor’s ownership interest in the Mortgage Loans since the date of the Servicing Agreement.

c. The Servicer and the Assignor shall have the right to amend, modify or terminate the Servicing Agreement without the joinder of the Assignee with respect to mortgage loans not conveyed to the Assignee hereunder; provided, however, that such amendment, modification or termination shall not affect or be binding on the Assignee.

Notwithstanding anything to the contrary in the Servicing Agreement, in the event the Servicer is obligated to make an advance pursuant to the Servicing Agreement, the aggregate payment due shall be the minimum monthly payment due under the mortgage note, net of servicing fees.

2. Accuracy of Agreement. The Servicer and the Assignor represent and warrant to the Assignee that (i) attached hereto as Exhibit 1 is a true, accurate and complete copy of the Servicing Agreement, (ii) the Servicing Agreement is in full force and effect as of the date hereof, (iii) other than as specified in the Assignment Assumption and Recognition Agreement dated as of April 1, 2007, among the Assignee, the Trustee, the Servicer and the Master Servicer, executed contemporaneously herewith, the Servicing Agreement has not been amended or modified in any respect and (iv) no notice of termination has been given to the Servicer under the Servicing Agreement.

3. Representations and Warranties of the Assignor. The Assignor warrants and represents to, and covenants with, the Assignee that:

a. The Assignor is the lawful owner of the Mortgage Loans with the full right to transfer such Mortgage Loans, which transfer is made subject to the terms and provisions of the Servicing Agreement but free from any other claims and encumbrances;

b. The Assignor has not received notice of, and has no knowledge of, any offsets, counterclaims or other defenses available to the Company with respect to the Servicing Agreement or the Mortgage Loans;

c. Unless noted below, the Assignor has not waived or agreed to any waiver under, or agreed to any amendment or other modification of, the Servicing Agreement or the Mortgage Loans, including without limitation the transfer of the servicing obligations under the Servicing Agreement. The Assignor has no knowledge of, and has not received notice of, any waivers under or amendments or other modifications of, or assignments of rights or obligations under, the Servicing Agreement or the Mortgage Loans;

d. Neither the Assignor nor anyone acting on its behalf has offered, transferred, pledged sold or otherwise disposed of the Mortgage Loans or any interest in the Mortgage Loans to, or solicited any offer to buy or accept a transfer, pledge or other disposition of the Mortgage Loans or any interest in the Mortgage Loans from, or otherwise approached or negotiated with respect to the Mortgage Loans, any interest in the Mortgage Loans with, any Person in any manner, or made any general solicitation by means of general advertising or in any other manner, or taken any other action which would constitute a distribution of the Mortgage Loans under the Securities Act of 1933 (the “Securities Act”) or which would render the disposition of the Mortgage Loans a violation of Section 5 of the Securities Act or require registration pursuant thereto;

e. The Assignor has been duly organized and is validly existing as a limited partnership in good standing under the laws of the State of New York with full power and authority to enter into and perform its obligations under the Servicing Agreement and this Assignment Agreement;

f. This Assignment Agreement has been duly executed and delivered by the Assignor, and, assuming due authorization, execution and delivery by each of the other parties hereto, constitutes a legal, valid, and binding agreement of the Assignor, enforceable against it in accordance with its terms, subject to bankruptcy, insolvency, reorganization, moratorium, or other similar laws affecting creditors’ rights generally and to general principles of equity regardless of whether enforcement is sought in a proceeding in equity or at law;

g. The execution, delivery and performance by the Assignor of this Assignment Agreement and the consummation of the transactions contemplated hereby do not require the consent or approval of, the giving of notice to, the registration with, or the taking of any other action in respect of, any state, federal or other governmental authority or agency, except such as has been obtained, given, effected or taken prior to the date thereof;

h. The execution and delivery of this Assignment Agreement have been duly authorized by all necessary partnership action on the part of the Assignor; neither the execution and delivery by the Assignor of this Assignment Agreement, nor the consummation by the Assignor of the transactions herein contemplated, nor compliance by the Assignor with the provisions hereof, will conflict with or result in a breach of, or constitute a default under, any of the provisions of the governing documents of the Assignor or any law, governmental rule or regulation or any material judgment, decree or order binding on the Assignor or any of its properties, or any of the provisions of any material indenture, mortgage, deed of trust, contract or other instrument to which the Assignor is a party or by which it is bound;

i. There are no actions, suits or proceedings pending or, to the knowledge of the Assignor, threatened, before or by any court, administrative agency, arbitrator or governmental body (A) with respect to any of the transactions contemplated by this Assignment Agreement or (B) with respect to any other matter that in the judgment of the Assignor will be determined adversely to the Assignor and will if determined adversely to the Assignor materially adversely affect its ability to perform its obligations under this Assignment Agreement;

j. Except for the sale to the Assignee, the Assignor has not assigned or pledged any Mortgage Note or the related Mortgage or any interest or participation therein;

k. The Assignor has not satisfied, canceled, or subordinated in whole or in part, or rescinded the Mortgage, and the Assignor has not released the Mortgaged Property from the lien of the Mortgage, in whole or in part, nor has the Assignor executed an instrument that would effect any such release, cancellation, subordination, or rescission. The Assignor has not released any Mortgagor, in whole or in part, except in connection with an assumption agreement or other agreement approved by the related federal insurer, to the extent such approval was required;

l. With respect to each Mortgage Loan, the representations and warranties contained in Section 2.04(b) of the Servicing Agreement, to the extent they relate to matters arising on or after the related Closing Date (as defined in the Servicing Agreement), are true and correct as of the date of this Assignment Agreement. For purposes of making the representations and warranties contemplated in the foregoing sentence, each reference in Section 2.04(b) of the Servicing Agreement to (i) the “Cut-off Date” shall be deemed to be a reference to April 1, 2007, (ii) the “Mortgage Loan Schedule” shall be deemed to be a reference to Exhibit 1 hereto and (iii) the “Closing Date” shall be deemed to be a reference to May 8, 2007; and

m. No Mortgage Loan is classified as a “high cost” mortgage loan under Section 32 of the Home Ownership and Equity Protection Act of 1994, as amended, and no Mortgage Loan is considered a “high cost” mortgage loan under any applicable federal, state or local predatory or abusive lending law (or a similarly classified loan using different terminology under a law imposing heightened regulatory scrutiny or additional legal liability for residential mortgage loans having high interest rates, points and/or fees). No Transferred Mortgage Loan is a “High Cost Loan” or “Covered Loan,” as applicable, as such terms are defined in the then current Standard & Poor’s LEVELSâ Glossary and no Mortgage Loan originated on or after October 1, 2002 through March 6, 2003 is governed by the Georgia Fair Lending Act.

It is understood and agreed that the representations and warranties set forth in this Section 3 shall survive delivery of the respective Mortgage Files to the [[Custodians]] and shall inure to the benefit of the Assignee and its assigns notwithstanding any restrictive or qualified endorsement or assignment. Upon the discovery by the Assignor or the Assignee and its assigns of a breach of the foregoing representations and warranties, the party discovering such breach shall give prompt written notice to the other parties to this Assignment Agreement, and in no event later than two (2) Business Days from the date of such discovery. It is understood and agreed that the obligations of the Assignor set forth in Section 6 below to repurchase a Mortgage Loan constitute the sole remedies available to the Assignee and its assigns on their behalf respecting a breach of the representations and warranties contained in this Section 3. It is further understood and agreed that the Assignor shall be deemed not to have made the representations and warranties in this Section 3 with respect to, and to the extent of, representations and warranties made, as to the matters covered in this Section 3, by the Servicer in the Servicing Agreement (or any officer’s certificate delivered pursuant thereto).

It is understood and agreed that the Assignor has made no representations or warranties to the Assignee other than those contained in this Section 3, and no other affiliate of the Assignor has made any representations or warranties of any kind to the Assignee.

4. Representations and Warranties of the Assignee. The Assignee warrants and represents to, and covenants with, the Assignor and the Company pursuant to Section 2.03 of the Servicing Agreement that:

a. The Assignee agrees to be bound, as Owner, by all of the terms, covenants and conditions of the Servicing Agreement and the Mortgage Loans and from and after the date hereof, the Assignee assumes for the benefit of each of the Company and the Assignor all of the Assignor’s obligations as Owner thereunder;

b. The Assignee understands that the Mortgage Loans have not been registered under the Securities Act or the securities laws of any state. The Assignee is not acquiring the Mortgage Loans with a view to or for sale or other transfer in connection with any distribution of the Mortgage Loans in any manner that would violate the Securities Act or any applicable state securities law. The Assignee considers itself a substantial, sophisticated institutional investor having such knowledge and experience in financial and business matters that it is capable of evaluating the merits and risks of investment in the Mortgage Loans. The Assignee has been furnished with all information regarding the Mortgage Loans that it has requested from the Assignor or the Company. Neither the Assignee nor anyone acting on its behalf has offered, transferred, pledged, sold or otherwise disposed of the Mortgage Loans, any interest in the Mortgage Loans to, or solicited any offer to buy or accept a transfer, pledge or other disposition of the Mortgage Loans, any interest in the Mortgage Loans from, or otherwise approached or negotiated with respect to the Mortgage Loans, any interest in the Mortgage Loans with, any Person in any manner, or made any general solicitation by means of general advertising or in any other manner or taken any other action, which would constitute a distribution of the Mortgage Loans under the Securities Act or which would render the disposition of the Mortgage Loans a violation of Section 5 of the Securities Act or require registration pursuant thereto, nor will it act, nor has it authorized or will it authorize any person to act, in such manner with respect to the Mortgage Loans;

c. The Assignee is either (i) not an employee benefit plan that is subject to the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), or Section 4975 of the Internal Revenue Code of 1986 (the “Code”)(a “Plan”) and not a Person acting, directly or indirectly, on behalf of or investing with “plan assets” of any such Plan or (ii) an employee benefit plan that is subject to ERISA and the assignment contemplated herein does not constitute and will not result in a non-exempt prohibited transaction under Section 406 of ERISA or Section 4975 of the Code;

d. The Assignee shall indemnify the Company for any loss or liability incurred by the Company arising (i) from any breach of warranty, representation or covenant of the Assignee made herein that materially and adversely affects the interests of the Company or (ii) by reasons of willful misfeasance, bad faith or negligence of the Assignee in the performance of its duties hereunder or by reason of reckless disregard of its obligations and duties hereunder;

e. The Assignee represents and warrants that it is a sophisticated investor able to evaluate the risks and merits of the transactions contemplated hereby, and that it has not relied in connection therewith upon any statements or representations of the Assignor or the Servicer other than those contained in the Servicing Agreement or this Assignment Agreement;

f. The Assignee hereto represents and warrants that it is duly and legally authorized to enter into this Assignment Agreement and to perform its obligations hereunder and under the Servicing Agreement; and

g. The Assignee hereto represents and warrants that this Assignment Agreement has been duly authorized, executed and delivered by it and (assuming due authorization, execution and delivery thereof by each of the other parties hereto) constitutes its legal, valid and binding obligation, enforceable in accordance with its terms, except as such enforcement may be limited by bankruptcy, insolvency, reorganization or other similar laws affecting the enforcement of creditors’ rights generally and by general equitable principles (regardless of whether such enforcement is considered in a proceeding in equity or at law).

5. Recognition of Assignee. From and after the date hereof, the Company shall note the transfer of the Mortgage Loans to the Assignee in its books and records, shall recognize the Assignee as the owner of the Mortgage Loans and shall service the Mortgage Loans for the benefit of the Assignee. The Company acknowledges that the Mortgage Loans may become part of a REMIC and the Company shall service the Mortgage Loans in accordance with the Servicing Agreement, the terms of which are incorporated herein by reference, but in no event in a manner that would (i) cause any REMIC to fail to qualify as a REMIC or (ii) result in the imposition of a tax upon any REMIC (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). It is the intention of the Assignor, the Company and the Assignee that the Servicing Agreement shall be binding upon and inure to the benefit of the Company and the Assignee and their respective successors and assigns.

6. Repurchase of Mortgage Loans.

Upon discovery or notice of any breach by the Assignor of any representation, warranty or covenant under this Assignment Agreement that materially and adversely affects the value of any Mortgage Loan or the interest of the Assignee therein (it being understood that any such defect or breach shall be deemed to have materially and adversely affected the value of the related Mortgage Loan or the interest of the Assignee therein if the Assignee incurs a loss as a result of such defect or breach), the Assignee promptly shall request that the Assignor cure such breach and, if the Assignor does not cure such breach in all material respects within 60 days of the earlier of either discovery by the Assignor of such breach or the date on which it is notified of the breach, the Assignee may enforce the Assignor’s obligation hereunder to purchase such Mortgage Loan from the Assignee at the Purchase Price (as defined in the Trust Agreement). Notwithstanding the foregoing, however, if such breach is a Qualification Defect (as defined in the Trust Agreement), then such cure or repurchase must take place within 45 days of discovery of such Qualification Defect.

In the event of a repurchase of any Mortgage Loan by the Assignor, the Assignee shall promptly deliver to the Assignor or its designee the related Mortgage File and shall assign to the Assignor all of the Assignee’s rights under the Servicing Agreement, but only insofar as the Servicing Agreement relates to such Mortgage Loan.

Except as specifically set forth herein, the Assignee shall have no responsibility to enforce any provision of this Assignment Agreement, to oversee compliance hereof or to take notice of any breach or default thereof.

7. Continuing Effect. Except as contemplated hereby, the Servicing Agreement shall remain in full force and effect in accordance with its terms.

8. Governing Law. THIS ASSIGNMENT AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICT OF LAW PROVISIONS (OTHER THAN SECTION 5-1401 OF THE GENERAL OBLIGATIONS LAW), AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

9. Notices. All demands and notices hereunder shall be in writing and shall be deemed to have been duly given if personally delivered at or mailed by registered mail, postage prepaid, or sent by overnight courier to (a) in the case of the Company, Residential Funding Company, LLC, 8400 Normandale Lake Boulevard, Suite 250, Minneapolis, Minnesota 55437, Attention: Office of the President, and Residential Funding Company, LLC, 2255 N. Ontario Street, Suite 400, Burbank, California 91504, Attention: Bond Administration Manager and/or such other address as may hereafter be furnished to the Owner in writing by the Company; (b) in the case of the Assignee, GS Mortgage Securities Corp., 85 Broad Street, New York, New York 10004, Attention: Christina House, Tel.: (212) 357-4778, Fax: (212) 902-3000 and/or such other address as may hereafter be furnished by the Assignee; and (c) in the case of the Assignor, Goldman Sachs Mortgage Company, 85 Broad Street, New York, New York 10004, Attention: Christina House, Tel.: (212) 357-4778, Fax: (212) 902-3000, and/or such other address as may hereafter be furnished by the Assignor.

10. This Assignment Agreement may be executed in counterparts, each of which when so executed shall be deemed to be an original and all of which when taken together shall constitute one and the same instrument.

11. Capitalized words and phrases used but not otherwise defined in this Assignment Agreement shall have the respective meanings assigned to them in the Servicing Agreement.

[SIGNATURE PAGES TO FOLLOW]

IN WITNESS WHEREOF, the parties have caused this Assignment Agreement to be executed by their duly authorized officers as of the date first above written.

ASSIGNEE:

GS MORTGAGE SECURITIES CORP.

By: /s/ Michelle Gill

Name: Michelle Gill

Title: Vice President

ASSIGNOR:

GOLDMAN SACHS MORTGAGE COMPANY

By: Goldman Sachs Real Estate Funding

Corp., its General Partner

By: /s/ Greg A. Finck

Name: Greg A. Finck

Title: Managing Director

SERVICER:

RESIDENTIAL FUNDING COMPANY, LLC

By: /s/ Heather Anderson

Name: Heather Anderson

Title: Associate

SCHEDULE A

[To be retained in a separate closing binder entitled “GSR 2007-OA1 Mortgage Loan Schedules”

at the Washington D.C. Offices of McKee Nelson LLP]

A-1

EXHIBIT 1

Servicing Agreement

1-1

GSR Mortgage Loan Trust 2007-OA1 8-K