UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) July 11, 2005

GMAC Commercial Mortgage Securities, Inc.
(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction
of incorporation)

333-123974-01
(Commission
File Number)

23-2811925
(IRS Employer
Identification No.)

200 Witmer Road, Horsham, Pennsylvania
(Address of principal executive offices)

19044
(Zip Code)

Registrant's telephone number, including area code 215-328-3164

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Section 8 - Other Events

Item 8.01. Other Events.

This current report on Form 8-K relates to the monthly distribution reported to the holders of GMAC Commercial Mortgage Securities, Inc. Mortgage Pass-Through Certificates, series 2005-C1, which was made on July 11, 2005.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

99.1 Monthly distribution report pursuant to section 4.02 of the Pooling and Servicing Agreement for the distribution on July 11, 2005.

(Exhibit No. Description)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LASALLE BANK NATIONAL ASSOCIATION, IN ITS CAPACITY AS TRUSTEE UNDER THE POOLING AND SERVICING AGREEMENT ON BEHALF OF GMAC COMMERCIAL MORTGAGE SECURITIES, INC., REGISTRANT

By: /s/ Russell Goldenberg
Russell Goldenberg
Group Senior Vice President

Date: July 14, 2005

GMAC Commercial Mortgage Securities, Inc.

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Reporting Package Table of Contents

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Administrator:
Ann Kelly 312.904.1487
ann.kelly@abnamro.com

Analyst:
Clifford Song 714.259.6244
Clifford.Song@abnamro.com

Statement Date:

135 S. LaSalle Street, Suite 1625
Chicago, IL 60603
USA

Statements to Certificateholders
Cash Reconciliation Summary
Bond Interest Reconciliation
Shortfall Summary Report

Rating Information

Asset-Backed Facts ~ 15 Month Loan Status Summary
Asset-Backed Facts ~ 15 Month Loan Payoff/Loss Summary

Mortgage Loan Characteristics
Delinquent Loan Detail
Historical Collateral Prepayment

Page 2-6
Page 7-9
Page 10
Page 11

Page 12-13

Page 14-16
Page 17-19

Page 20-22
Page 23

Page 24

Loan Level Detail

Specially Serviced (Part I) - Loan Detail
Specially Serviced (Part II) - Servicer Comments
Historical REO Report

Modified Loan Detail
Realized Loss Detail
Appraisal Reduction Detail

Page 25-28

Page 29
Page 30
Page 31

Page 32
Page 33
Page 34

Page(s)

Information is available for this issue from the following sources

Issue Id:

Monthly Data File
Name:

GMAC05C1

GMAC05C1_200507_3.ZIP

Closing Date:

First Payment Date:

Rated Final Payment: Date:

6-Jun-05
11-Jul-05

11-May-43

Parties to The Transaction

Issuer: GMAC Commercial Mortgage Securities, Inc.

Depositor: GMAC Commercial Mortgage Securities, Inc.

Underwriter: Deutsche Bank Securities Inc./GMAC Commercial Holding Capital Markets Corp./Morgan Stanley & Co. Incorporated

Master Servicer: GMAC Commercial Mortgage Corporation

Special Servicer: GMAC Commercial Mortgage Corporation

Rating Agency: Fitch Ratings/Standard & Poor's Ratings Services

800.246.5761

LaSalle Factor Line

LaSalle Web Site

Servicer Web Site

www.gmaccm.com

www.etrustee.net

Page 1 of 34

Class

CUSIP

Original

Opening

Principal

Negative

Closing

Interest

Pass-Through

Per $ 1000

Next Rate(3)

WAC:
WAMM:

Payment Date:
Prior Payment:
Next Payment:
Record Date:

5.503992%

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

GMAC Commercial Mortgage Securities, Inc.

Mortgage Pass-Through Certificates

Series 2005-C1

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

REMIC III

Statement Date:

ABN AMRO Acct: 722718.1

1000.000000000

9.740461275

0.000000000

990.259538725

3.506666667

Fixed

0.00

0.000000000

4.2080000000%

0.000000000

361849M41

A-1

61,200,000.00

596,116.23

0.00

60,603,883.77

214,608.00

61,200,000.00

1000.000000000

0.175619654

0.000000000

999.824380346

3.845833321

Fixed

0.00

0.000000000

4.6150000000%

0.000000000

361849M58

A-1A

344,507,000.00

60,502.20

0.00

344,446,497.80

1,324,916.50

344,507,000.00

1000.000000000

0.000000000

1000.000000000

3.725833333

Fixed

0.00

0.000000000

4.4710000000%

0.000000000

361849M66

A-2

300,000,000.00

0.00

300,000,000.00

1,117,750.00

300,000,000.00

1000.000000000

0.000000000

1000.000000000

3.781666684

Fixed

0.00

0.000000000

4.5380000000%

0.000000000

361849M74

A-3

187,300,000.00

0.00

187,300,000.00

708,306.17

187,300,000.00

1000.000000000

0.000000000

1000.000000000

3.849166667

Fixed

0.00

0.000000000

4.6190000000%

0.000000000

361849M82

A-4

68,100,000.00

0.00

68,100,000.00

262,128.25

68,100,000.00

1000.000000000

0.000000000

1000.000000000

3.914166640

Fixed

0.00

0.000000000

4.6970000000%

0.000000000

361849Q21

A-5

157,393,000.00

0.00

157,393,000.00

616,062.43

157,393,000.00

1000.000000000

0.000000000

999.589063167

0.079820612

0.00

0.000000000

0.0957847339%

0.000000000

361849N65

X-1

1,597,857,327.00

0.00

1,597,200,708.57

127,541.95

1,597,857,327.00

1000.000000000

0.000000000

1000.000000000

0.648352960

0.00

0.000000000

0.7780235519%

0.000000000

361849M90

X-2

1,490,771,000.00

0.00

1,490,771,000.00

966,545.79

1,490,771,000.00

1000.000000000

0.000000000

1000.000000000

3.961666677

Fixed

0.00

0.000000000

4.7540000000%

0.000000000

361849Q39

A-M

159,785,000.00

0.00

159,785,000.00

633,014.91

159,785,000.00

1000.000000000

0.000000000

1000.000000000

4.004999961

Fixed

0.00

0.000000000

4.8060000000%

0.000000000

361849N24

A-J

127,829,000.00

0.00

127,829,000.00

511,955.14

127,829,000.00

1000.000000000

0.000000000

1000.000000000

4.113333333

Fixed

0.00

0.000000000

4.9360000000%

0.000000000

361849N32

33,954,000.00

0.00

33,954,000.00

139,664.12

33,954,000.00

1000.000000000

0.000000000

1000.000000000

4.156666389

4.9880000000%

0.00

0.000000000

4.9880000000%

0.000000000

361849N40

11,984,000.00

0.00

11,984,000.00

49,813.49

11,984,000.00

1000.000000000

0.000000000

1000.000000000

4.214166806

5.0570000000%

0.00

0.000000000

5.0570000000%

0.000000000

361849N57

23,968,000.00

0.00

23,968,000.00

101,005.15

23,968,000.00

1000.000000000

0.000000000

1000.000000000

4.295833281

5.1550000000%

0.00

0.000000000

5.1550000000%

0.000000000

361849N73

15,979,000.00

0.00

15,979,000.00

68,643.12

15,979,000.00

1000.000000000

0.000000000

1000.000000000

4.033333333

4.8400000000%

0.00

0.000000000

4.8400000000%

0.000000000

361849N81

15,978,000.00

0.00

15,978,000.00

64,444.60

15,978,000.00

Page 2 of 34

Notes: (1) N denotes notional balance not included in total (2) Accrued Interest Plus/Minus Interest Adjustment Minus Deferred Interest equals Interest Payment (3) Estimated. * Denotes Controlling Class

Class

CUSIP

Original

Opening

Principal

Negative

Closing

Interest

Pass-Through

Per $ 1000

Next Rate(3)

WAC:
WAMM:

Payment Date:
Prior Payment:
Next Payment:
Record Date:

5.503992%

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

GMAC Commercial Mortgage Securities, Inc.

Mortgage Pass-Through Certificates

Series 2005-C1

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

REMIC III

Statement Date:

ABN AMRO Acct: 722718.1

1000.000000000

0.000000000

1000.000000000

4.097499844

4.9170000000%

0.00

0.000000000

4.9170000000%

0.000000000

361849N99

15,979,000.00

0.00

15,979,000.00

65,473.95

15,979,000.00

1000.000000000

0.000000000

1000.000000000

4.390000000

5.2680000000%

0.00

0.000000000

5.2680000000%

0.000000000

361849P22

19,973,000.00

0.00

19,973,000.00

87,681.47

19,973,000.00

1000.000000000

0.000000000

1000.000000000

3.729167223

4.4750000000%

0.00

0.000000000

4.4750000000%

0.000000000

361849P30

5,992,000.00

0.00

5,992,000.00

22,345.17

5,992,000.00

1000.000000000

0.000000000

1000.000000000

3.729167223

4.4750000000%

0.00

0.000000000

4.4750000000%

0.000000000

361849P48

5,992,000.00

0.00

5,992,000.00

22,345.17

5,992,000.00

1000.000000000

0.000000000

1000.000000000

3.729166354

4.4750000000%

0.00

0.000000000

4.4750000000%

0.000000000

361849P55

7,989,000.00

0.00

7,989,000.00

29,792.31

7,989,000.00

1000.000000000

0.000000000

1000.000000000

3.729166458

4.4750000000%

0.00

0.000000000

4.4750000000%

0.000000000

361849P63

3,995,000.00

0.00

3,995,000.00

14,898.02

3,995,000.00

1000.000000000

0.000000000

1000.000000000

3.729166458

4.4750000000%

0.00

0.000000000

4.4750000000%

0.000000000

361849P71

3,995,000.00

0.00

3,995,000.00

14,898.02

3,995,000.00

1000.000000000

0.000000000

1000.000000000

3.729166249

4.4750000000%

0.00

0.000000000

4.4750000000%

0.000000000

361849P89

3,994,000.00

0.00

3,994,000.00

14,894.29

3,994,000.00

1000.000000000

0.000000000

1000.000000000

3.729166654

4.4750000000%

0.00

0.000000000

4.4750000000%

0.000000000

361849P97

21,971,327.00

0.00

21,971,327.00

81,934.74

21,971,327.00

0.000000000

0.00

0.000000000

N/A

0.000000000

111322640

R-III

0.00

0.000000000

0.00

0.000000000

N/A

0.000000000

111322624

R-I

0.00

0.000000000

0.00

0.000000000

N/A

0.000000000

111322632

R-II

0.00

Page 3 of 34

Class

CUSIP

Original

Opening

Principal

Negative

Closing

Interest

Pass-Through

Per $ 1000

Next Rate(3)

WAC:
WAMM:

Payment Date:
Prior Payment:
Next Payment:
Record Date:

5.503992%

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

GMAC Commercial Mortgage Securities, Inc.

Mortgage Pass-Through Certificates

Series 2005-C1

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

REMIC III

Statement Date:

ABN AMRO Acct: 722718.1

Total P&I Payment

0.00

1,597,857,327.00

7,917,281.19

Total

1,597,200,708.57

656,618.43

0.00

7,260,662.76

Page 4 of 34

Class

CUSIP

Original

Opening

Principal

Negative

Closing

Interest

Pass-Through

Per $ 1000

Next Rate(3)

WAC:
WAMM:

Payment Date:
Prior Payment:
Next Payment:
Record Date:

5.503992%

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

GMAC Commercial Mortgage Securities, Inc.

Mortgage Pass-Through Certificates

Series 2005-C1

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

Grantor Trust Q

Statement Date:

ABN AMRO Acct: 722718.1

0.000000000

0.00

0.000000000

N/A

0.000000000

111322608

0.00

Total P&I Payment

0.00

Total

0.00

Page 5 of 34

Class

CUSIP

Original

Opening

Principal

Negative

Closing

Interest

Pass-Through

Per $ 1000

Next Rate(3)

WAC:
WAMM:

Payment Date:
Prior Payment:
Next Payment:
Record Date:

5.503992%

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

GMAC Commercial Mortgage Securities, Inc.

Mortgage Pass-Through Certificates

Series 2005-C1

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

Grantor Trust W

Statement Date:

ABN AMRO Acct: 722718.1

0.000000000

0.00

0.000000000

N/A

0.000000000

111322616

0.00

Total P&I Payment

0.00

Total

0.00

Page 6 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Statement Date:

Cash Reconciliation Summary

Current Scheduled Interest

Interest Summary

Less Deferred Interest

Plus Gross Advance Interest

Less PPIS Reducing Scheduled Int

7,328,828.42

0.00
0.00

Less ASER Interest Adv Reduction

0.00

Less Other Adjustment

0.00

Total

7,328,828.42

Unscheduled Interest:
Prepayment Penalties

0.00

Yield Maintenance Penalties

0.00

Other Interest Proceeds

0.00

Total

0.00

Less Fees & Expenses Paid By/To Servicer

Less Fee Paid To Servicer

Less Fee Strips Paid by Servicer

Special Servicing Fees

Interest Due Serv on Advances

Recoup of Prior Advances

Misc. Fees & Expenses

Total Unscheduled Fees & Expenses
Total Interest Due Trust

Less Fees & Expenses Paid By/To Trust
Trustee Fee
Fee Strips
Misc. Fees
Interest Reserve Withholding

Plus Interest Reserve Deposit
Total

Total Interest Due Certs

Principal Summary

Scheduled Principal:
Current Scheduled Principal
Advanced Scheduled Principal
Scheduled Principal
Unscheduled Principal:
Curtailments
Prepayments in Full
Liquidation Proceeds
Repurchase Proceeds
Other Principal Proceeds
Total Unscheduled Principal
Remittance Principal

Remittance P&I Due Trust

Remittance P&I Due Certs

Pool Balance Summary

Beginning Pool
Scheduled Principal
Unscheduled Principal
Deferred Interest
Liquidations
Repurchases

Ending Pool

Balance

Count

Principal

Interest

Prior Outstanding
Plus Current Period
Less Recovered

Ending Outstanding

Servicing Fee Summary

Current Servicing Fees
Plus Fees Advanced for PPIS
Less Reduction for PPIS
Plus Delinquent Servicing Fees

Total Servicing Fees

PPIS Summary

Gross PPIS
Reduced by PPIE
Reduced by Shortfalls in Fees
Reduced by Other Amounts

PPIS Reducing Scheduled
Interest

PPIS Reducing Servicing Fee
PPIS Due Certificate

0.00

0.00
0.00

0.00

7,262,393.78

)

(1,731.01

0.00
0.00
0.00

)

(1,731.01

656,618.43

0.00

656,618.43

0.00
0.00
0.00
0.00
0.00
0.00

656,618.43

7,919,012.21

7,917,281.20

1,597,857,327.88

656,618.43

0.00

0.00
0.00

0.00

1,597,200,709.45

0.00

66,434.63

0.00
0.00
0.00

66,434.63

0.00
0.00
0.00
0.00
0.00
0.00

0.00

)

(66,434.63

7,260,662.77

Interest Not Advanced (

Current Period

)

0.00

Workout Fees
Liquidation Fees

0.00
0.00

Less Non Recovered

0.00

0.00
0.00

0.00

Advance Summary (Advance Made by Servicer)

Page 7 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Statement Date:

Cash Reconciliation Summary Group I Loans

Current Scheduled Interest

Interest Summary

Less Deferred Interest

Plus Gross Advance Interest

Less PPIS Reducing Scheduled Int

5,727,851.98

0.00
0.00

Less ASER Interest Adv Reduction

0.00

Less Other Adjustment

0.00

Total

5,727,851.98

Unscheduled Interest:
Prepayment Penalties

0.00

Yield Maintenance Penalties

0.00

Other Interest Proceeds

0.00

Total

0.00

Less Fees & Expenses Paid By/To Servicer

Less Fee Paid To Servicer

Less Fee Strips Paid by Servicer

Special Servicing Fees

Interest Due Serv on Advances

Recoup of Prior Advances

Misc. Fees & Expenses

Total Unscheduled Fees & Expenses
Total Interest Due Trust

Less Fees & Expenses Paid By/To Trust
Trustee Fee
Fee Strips
Misc. Fees
Interest Reserve Withholding

Plus Interest Reserve Deposit
Total

Total Interest Due Certs

Principal Summary

Remittance P&I Due Trust

Remittance P&I Due Certs

Pool Balance Summary

Beginning Pool
Scheduled Principal
Unscheduled Principal
Deferred Interest
Liquidations
Repurchases

Ending Pool

Balance

Count

Principal

Interest

Prior Outstanding
Plus Current Period
Less Recovered

Ending Outstanding

Servicing Fee Summary

Current Servicing Fees
Plus Fees Advanced for PPIS
Less Reduction for PPIS
Plus Delinquent Servicing Fees

Total Servicing Fees

PPIS Summary

Gross PPIS
Reduced by PPIE
Reduced by Shortfalls in Fees
Reduced by Other Amounts

PPIS Reducing Scheduled
Interest

PPIS Reducing Servicing Fee
PPIS Due Certificate

0.00

0.00
0.00

0.00

5,676,145.83

)

(1,357.80

0.00
0.00
0.00

)

(1,357.80

596,116.23

0.00

596,116.23

0.00
0.00
0.00
0.00
0.00
0.00

596,116.23

6,272,262.06

6,270,904.26

1,253,349,907.10

596,116.23

0.00

0.00
0.00

0.00

1,252,753,790.87

0.00

51,706.15

0.00
0.00
0.00

51,706.15

0.00
0.00
0.00
0.00
0.00
0.00

0.00

)

(51,706.15

5,674,788.03

Interest Not Advanced (

Current Period

)

0.00

Workout Fees
Liquidation Fees

0.00
0.00

Less Non Recovered

0.00

0.00
0.00

0.00

Advance Summary (Advance Made by Servicer)

Page 8 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Statement Date:

Cash Reconciliation Summary Group II Loans

Current Scheduled Interest

Interest Summary

Less Deferred Interest

Plus Gross Advance Interest

Less PPIS Reducing Scheduled Int

1,600,976.44

0.00
0.00

Less ASER Interest Adv Reduction

0.00

Less Other Adjustment

0.00

Total

1,600,976.44

Unscheduled Interest:
Prepayment Penalties

0.00

Yield Maintenance Penalties

0.00

Other Interest Proceeds

0.00

Total

0.00

Less Fees & Expenses Paid By/To Servicer

Less Fee Paid To Servicer

Less Fee Strips Paid by Servicer

Special Servicing Fees

Interest Due Serv on Advances

Recoup of Prior Advances

Misc. Fees & Expenses

Total Unscheduled Fees & Expenses
Total Interest Due Trust

Less Fees & Expenses Paid By/To Trust
Trustee Fee
Fee Strips
Misc. Fees
Interest Reserve Withholding

Plus Interest Reserve Deposit
Total

Total Interest Due Certs

Principal Summary

Remittance P&I Due Trust

Remittance P&I Due Certs

Pool Balance Summary

Beginning Pool
Scheduled Principal
Unscheduled Principal
Deferred Interest
Liquidations
Repurchases

Ending Pool

Balance

Count

Principal

Interest

Prior Outstanding
Plus Current Period
Less Recovered

Ending Outstanding

Servicing Fee Summary

Current Servicing Fees
Plus Fees Advanced for PPIS
Less Reduction for PPIS
Plus Delinquent Servicing Fees

Total Servicing Fees

PPIS Summary

Gross PPIS
Reduced by PPIE
Reduced by Shortfalls in Fees
Reduced by Other Amounts

PPIS Reducing Scheduled
Interest

PPIS Reducing Servicing Fee
PPIS Due Certificate

0.00

0.00
0.00

0.00

1,586,247.96

)

(373.22

0.00
0.00
0.00

)

(373.22

60,502.20

0.00

60,502.20

0.00
0.00
0.00
0.00
0.00
0.00

60,502.20

1,646,750.16

1,646,376.94

344,507,420.78

60,502.20

0.00

0.00
0.00

0.00

344,446,918.58

0.00

14,728.48

0.00
0.00
0.00

14,728.48

0.00
0.00
0.00
0.00
0.00
0.00

0.00

)

(14,728.48

1,585,874.74

Interest Not Advanced (

Current Period

)

0.00

Workout Fees
Liquidation Fees

0.00
0.00

Less Non Recovered

0.00

0.00
0.00

0.00

Advance Summary (Advance Made by Servicer)

Page 9 of 34

GMAC Commercial Mortgage Securities, Inc.

Class

Accrued

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Bond Interest Reconciliation

Deductions

Allocable

Deferred &

Prior

Prepay-

Other

Additions

Interest

Credit Support

Original

Current(4)

Accrual

Int. Short-

falls Due

ment

Interest

Int erest (2)

Payment

Amount

PPIS

Int erest

Certificate

Accretion

Interest

Loss/Exp

Interest

Penalties

Proceeds (1)

Interest

Shortfalls

Certificate

Rate

Pass

Thru

Method Days

Outstanding

Remaining

Statement Date:

Distributable

Current Period

(Shortfall)/

Recovery

Int Accrual

on Prior

Shortfall (3)

3.00
1.00

0.00

A-1

214,608.00

0.00

30.00%

30.01%

30/360

4.208000000%

0.00

A-1A

1,324,916.50

0.00

30.00%

30.01%

30/360

4.615000000%

0.00

A-2

1,117,750.00

0.00

30.00%

30.01%

30/360

4.471000000%

0.00

A-3

708,306.17

0.00

30.00%

30.01%

30/360

4.538000000%

0.00

A-4

262,128.25

0.00

30.00%

30.01%

30/360

4.619000000%

0.00

A-5

616,062.43

0.00

30.00%

30.01%

30/360

4.697000000%

0.00

X-1

127,541.95

0.00

30/360

0.095784734%

0.00

X-2

966,545.79

0.00

30/360

0.778023552%

0.00

A-M

633,014.91

0.00

20.00%

20.01%

30/360

4.754000000%

0.00

A-J

511,955.14

0.00

12.00%

30/360

4.806000000%

0.00

139,664.12

0.00

9.88%

30/360

4.936000000%

0.00

49,813.49

0.00

9.13%

30/360

4.988000000%

0.00

101,005.15

0.00

7.63%

30/360

5.057000000%

0.00

68,643.12

0.00

6.63%

30/360

5.155000000%

0.00

64,444.60

0.00

5.63%

30/360

4.840000000%

0.00

65,473.95

0.00

4.63%

30/360

4.917000000%

0.00

87,681.47

0.00

3.38%

30/360

5.268000000%

0.00

22,345.17

0.00

3.00%

30/360

4.475000000%

0.00

22,345.17

0.00

2.63%

30/360

4.475000000%

0.00

29,792.31

0.00

2.13%

30/360

4.475000000%

0.00

14,898.02

0.00

1.88%

30/360

4.475000000%

0.00

14,898.02

0.00

1.63%

30/360

4.475000000%

0.00

14,894.29

0.00

1.38%

30/360

4.475000000%

0.00

81,934.74

0.00

0.00%

30/360

4.475000000%

0.00

30/360

0.000000000%

0.00

30/360

0.000000000%

0.00

7,260,662.76

0.00

(2) Accrued - Deductions + Additions Interest

(3) Includes interest accrued on outstanding Interest Shortfalls and/or Loss Allocations. Where applicable.

Page 10 of 34

(1) Other Interest Proceeds are additional interest amounts specifically allocated to the bond(s) and used in determining the bonds Distributable Interest.

(4) Determined as follows: (A) the ending balance of all the classes less (B) the sum of (i) the ending balance of the class and (ii) the ending balance of all classes which are not subordinate to the class divided by (A).

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Interest Adjustments Summary

Statement Date:

0.00

Special Servicing Fees

Workout Fees

Liquidation Fees

Legal Fees

0.00

Misc. Fees & Expenses Paid by/to Servicer

Interest Paid to Servicer on Outstanding Advances

0.00

ASER Interest Advance Reduction

Interest Not Advanced (Current Period)

Recoup of Prior Advances by Servicer

0.00

Servicing Fees Paid Servicer on Loans Not Advanced

Misc. Fees & Expenses Paid by Trust

0.00

Shortfall Due to Rate Modification

Total Shortfall Allocated to the Bonds

Total Interest Adjustment to the Bonds

0.00

Shortfall Allocated to the Bonds:

Excess Allocated to the Bonds:

Other Interest Proceeds Due the Bonds

Yield Maintenance Penalties Due the Bonds

Prepayment Penalties Due the Bonds

Recovered ASER Interest Due the Bonds

Recovered Interest Due the Bonds

Less Total Shortfall Allocated to the Bonds

Total Excess Allocated to the Bonds

0.00

0.00

Total Excess Allocated to the Bonds

0.00

0.00

Aggregate Interest Adjustment Allocated to the Bonds

0.00

Prepayment Interest Excess Due the Bonds

0.00

ARD Excess Interest

0.00

Net Prepayment Int. Shortfalls Allocated to the Bonds

Other Interest Loss

Interest Income

0.00

Page 11 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Rating Information

Class

CUSIP

Fitch

Moody's

S&P

Fitch

Moody's

S&P

Original Ratings

Rating Change/Change Date(1)

Statement Date:

A-1

361849M41

AAA

A-1A

361849M58

AAA

A-2

361849M66

AAA

A-3

361849M74

AAA

A-4

361849M82

AAA

A-5

361849Q21

AAA

X-1

361849N65

AAA

X-2

361849M90

AAA

A-M

361849Q39

AAA

A-J

361849N24

AAA

361849N32

361849N40

AA-

361849N57

361849N73

A-

361849N81

BBB+

361849N99

BBB

361849P22

BBB-

361849P30

BB+

361849P48

361849P55

BB-

361849P63

B+

361849P71

Page 12 of 34

NR - Designates that the class was not rated by the rating agency.

(1)

Changed ratings provided on this report are based on information provided by the applicable rating agency via electronic transmission. It shall be understood that this transmission will generally have been provided to

LaSalle within 30 days of the payment date listed on this statement. Because ratings may have changed during the 30 day window, or may not be being provided by the rating agency in an electronic format and therefore not
being updated on this report, LaSalle recommends that investors obtain current rating information directly from the rating agency.

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Rating Information

Class

CUSIP

Fitch

Moody's

S&P

Fitch

Moody's

S&P

Original Ratings

Rating Change/Change Date(1)

Statement Date:

361849P89

B-

361849P97

111322608

111322616

Page 13 of 34

NR - Designates that the class was not rated by the rating agency.

(1)

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary

Distribution

Date

Delinq 1 Month

Delinq 2 Months

Delinq 3+ Months

Foreclosure

REO

Modifications

Specially Serviced

Bankruptcy

# Balance

Delinquency Aging Categories

Special Event Categories (1)

Statement Date:

ABN AMRO Acct: 722718.1

0.00%

11-Jul-05

(1) Note: Modification, Specially Serviced & Bankruptcy Totals are Included in the Appropriate Delinquency Aging Category

Page 14 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary

Distribution

Date

Delinq 1 Month

Delinq 2 Months

Delinq 3+ Months

Foreclosure

REO

Modifications

Specially Serviced

Bankruptcy

# Balance

Delinquency Aging Categories

Special Event Categories (1)

Statement Date:

Group I Loans

ABN AMRO Acct: 722718.1

0.00%

11-Jul-05

(1) Note: Modification, Specially Serviced & Bankruptcy Totals are Included in the Appropriate Delinquency Aging Category

Page 15 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary

Distribution

Date

Delinq 1 Month

Delinq 2 Months

Delinq 3+ Months

Foreclosure

REO

Modifications

Specially Serviced

Bankruptcy

# Balance

Delinquency Aging Categories

Special Event Categories (1)

Statement Date:

Group II Loans

ABN AMRO Acct: 722718.1

0.00%

11-Jul-05

(1) Note: Modification, Specially Serviced & Bankruptcy Totals are Included in the Appropriate Delinquency Aging Category

Page 16 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Distribution

Date

Ending Pool (1)

Payoffs(2)

Penalties

Appraisal Reduct. (2)

Liquidations (2)

Realized Losses (2)

Remaining Term

Curr Weighted Avg.

# Balance

# Amount

# Balance

# Amount

Life

Coupon Remit

Statement Date:

Amort

ABN AMRO Acct: 722718.1

Series 2005-C1

11-Jul-05

100.00%

1,597,200,709

99.96%

0.00%

242

5.50%

5.45%

(1) Percentage based on pool as of cutoff. (2) Percentage based on pool as of beginning of period.

Page 17 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Distribution

Date

Ending Pool (1)

Payoffs(2)

Penalties

Appraisal Reduct. (2)

Liquidations (2)

Realized Losses (2)

Remaining Term

Curr Weighted Avg.

# Balance

# Amount

# Balance

# Amount

Life

Coupon Remit

Statement Date:

Group I Loans

Amort

ABN AMRO Acct: 722718.1

Series 2005-C1

11-Jul-05

76.92%

1,252,753,791

78.40%

0.00%

247

5.48%

5.43%

(1) Percentage based on pool as of cutoff. (2) Percentage based on pool as of beginning of period.

Page 18 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Distribution

Date

Ending Pool (1)

Payoffs(2)

Penalties

Appraisal Reduct. (2)

Liquidations (2)

Realized Losses (2)

Remaining Term

Curr Weighted Avg.

# Balance

# Amount

# Balance

# Amount

Life

Coupon Remit

Statement Date:

Group II Loans

Amort

ABN AMRO Acct: 722718.1

Series 2005-C1

11-Jul-05

23.08%

344,446,919

21.56%

0.00%

225

5.58%

5.52%

(1) Percentage based on pool as of cutoff. (2) Percentage based on pool as of beginning of period.

Page 19 of 34

GMAC Commercial Mortgage Securities, Inc.

Mortgage Loan Characteristics

ABN AMRO Acct: 722718.1

Series 2005-C1

Mortgage Pass-Through Certificates

30-Jun-05

10-Aug-05

N/A

11-Jul-05

Record Date:

Next Payment:

Prior Payment:

Payment Date:

Statement Date:

Distribution of Mortgage Interest Rates

Distribution of Principal Balances

Distribution of Remaining Term (Balloon)

Distribution of Remaining Term (Fully Amortizing)

Page 20 of 34

Current Scheduled

Balance

# of

Loans

Scheduled

Balance

% of

Balance

Weighted Average

Term Coupon PFY DSCR

797,541

0.05

117

5.88

0.00

0 to

2,000,000

9,784,965

0.61

151

5.51

0.00

2,000,000 to

3,000,000

43,145,382

2.70

116

5.59

0.00

3,000,000 to

4,000,000

48,469,952

3.03

126

5.49

0.00

4,000,000 to

6,000,000

91,452,229

5.73

109

5.40

0.00

6,000,000 to

8,000,000

53,868,057

3.37

108

5.52

0.00

8,000,000 to 10,000,000

222,672,262

13.94

115

5.45

0.00

10,000,000 to 15,000,000

416,388,075

26.07

107

5.54

0.00

15,000,000 to 30,000,000

44,350,914

2.78

117

5.19

0.00

30,000,000 to 50,000,000

666,271,332

41.71

5.53

0.00

50,000,000 &

Above

180,000,000

797,541

1,597,200,709

100.00

Average Schedule Balance
Maximum Schedule Balance
Minimum Schedule Balance

17,551,656

Current Mortgage

Interest Rate

# of

Loans

Scheduled

Balance

% of

Balance

Weighted Average

Term Coupon PFY DSCR

44,658,860

2.80

117

4.85

0.00

0.100%

4.999%

310,582,902

19.45

5.13

0.00

5.000%

5.249%

698,992,326

43.76

104

5.40

0.00

5.250%

5.499%

270,640,582

16.94

5.63

0.00

5.500%

5.749%

134,523,805

8.42

110

5.86

0.00

5.750%

5.999%

97,266,040

6.09

6.42

0.00

6.000%

6.499%

40,536,195

2.54

118

6.71

0.00

6.500%

Above

1,597,200,709

Minimum Mortgage Interest Rate
Maximum Mortgage Interest Rate

100.00

4.766%
6.720%

Fully Amortizing

Mortgage Loans

# of

Loans

Scheduled

Balance

% of

Balance

Weighted Average

Term Coupon PFY DSCR

0.00

150

0.00

151

225

11,060,938

0.69

236

5.86

0.00

226

300

0.00

301

Above

239

235

11,060,938

Minimum Remaining Term
Maximum Remaining Term

0.69

Balloon

Mortgage Loans

# of

Loans

Scheduled

Balance

% of

Balance

Weighted Average

Term Coupon PFY DSCR

0.00

567,285,783

35.52

5.41

0.00

100,265,332

6.28

6.35

0.00

4,500,000

0.28

5.30

0.00

100

877,348,487

54.93

117

5.45

0.00

101

120

0.00

121

140

36,740,169

2.30

163

5.68

0.00

141

& Above

173

1,586,139,771

Minimum Remaining Term
Maximum Remaining Term

99.31

GMAC Commercial Mortgage Securities, Inc.

Mortgage Loan Characteristics

ABN AMRO Acct: 722718.1

Series 2005-C1

Mortgage Pass-Through Certificates

30-Jun-05

10-Aug-05

N/A

11-Jul-05

Record Date:

Next Payment:

Prior Payment:

Payment Date:

Statement Date:

Geographic Distribution

Distribution of DSCR (PFY)

Distribution of DSCR (Cutoff)

Page 21 of 34

Debt Service

Coverage Ratio

# of

Loans

Scheduled

Balance

% of

Balance

WAMM WAC PFY DSCR

0.00

0.010 1.090

0.00

1.100 1.190

0.00

1.200 1.290

0.00

1.300 1.390

0.00

1.400 1.490

0.00

1.500 1.590

0.00

1.600 1.690

0.00

1.700 1.790

0.00

1.800 1.890

0.00

1.900 1.990

0.00

2.000 & Above

1,597,200,709

100.00

5.50

0.00

Unknown

0.000
0.000

1,597,200,709

100.00

Minimum DSCR

Maximum DSCR

Debt Service

Coverage Ratio

# of

Loans

Scheduled

Balance

% of

Balance

WAMM WAC PFY DSCR

0.00

0.010 1.000

2,793,853

0.17

239

5.88

0.00

1.001 1.100

24,776,695

1.55

136

5.54

0.00

1.101 1.200

635,021,737

39.76

104

5.51

0.00

1.201 1.300

328,354,953

20.56

100

5.76

0.00

1.301 1.400

85,042,432

5.32

5.62

0.00

1.401 1.500

228,736,252

14.32

5.47

0.00

1.501 1.600

43,348,380

2.71

123

5.55

0.00

1.601 1.700

5,089,091

0.32

118

5.28

0.00

1.701 1.800

7,530,915

0.47

118

5.40

0.00

1.801 1.900

3,800,000

0.24

116

5.24

0.00

1.901 2.000

0.00

2.001 2.100

27,000,000

1.69

114

5.30

0.00

2.101 2.200

25,706,402

1.61

117

4.80

0.00

2.201 2.300

180,000,000

11.27

5.13

0.00

2.301 & Above

2.380

1.050

1,597,200,709 100.00

Minimum DSCR

Maximum DSCR

Geographic

Location

# of

Loans

Scheduled

Balance

% of

Balance

WAMM WAC PFY DSCR

New York

289,116,819

18.10

5.32

0.00

California

194,491,695

12.18

5.55

0.00

New Jersey

168,682,621

10.56

111

5.47

0.00

Texas

134,899,566

8.45

113

5.75

0.00

Undefined

106,679,782

6.68

6.36

0.00

Nevada

77,618,294

4.86

5.48

0.00

Michigan

77,216,743

4.83

5.50

0.00

Florida

75,862,006

4.75

106

5.18

0.00

Connecticut

63,300,000

3.96

116

5.49

0.00

Arkansas

57,001,404

3.57

124

5.44

0.00

Missouri

44,350,914

2.78

117

5.19

0.00

North Carolina

38,250,000

2.39

116

5.14

0.00

Colorado

36,382,829

2.28

109

5.39

0.00

Georgia

33,144,906

2.08

117

5.42

0.00

Maryland

31,212,631

1.95

5.59

0.00

District of Columbia

27,000,000

1.69

114

5.30

0.00

Pennsylvania

24,918,087

1.56

117

5.30

0.00

Virginia

23,425,765

1.47

115

5.35

0.00

Arizona

20,540,650

1.29

5.92

0.00

Washington

15,966,378

1.00

147

5.39

0.00

Illinois

12,400,000

0.78

119

5.27

0.00

New Hampshire

10,999,252

0.69

117

5.43

0.00

Utah

7,080,000

0.44

5.14

0.00

Oregon

6,886,285

0.43

101

5.31

0.00

Kentucky

4,500,707

0.28

235

6.08

0.00

Delaware

4,390,265

0.27

118

5.12

0.00

Alabama

3,792,800

0.24

118

5.84

0.00

Mississippi

3,700,000

0.23

5.58

0.00

West Virginia

3,390,309

0.21

118

5.74

0.00

100.00

1,597,200,709

GMAC Commercial Mortgage Securities, Inc.

Mortgage Loan Characteristics

ABN AMRO Acct: 722718.1

Series 2005-C1

Mortgage Pass-Through Certificates

30-Jun-05

10-Aug-05

N/A

11-Jul-05

Record Date:

Next Payment:

Prior Payment:

Payment Date:

Statement Date:

Distribution of Loan Seasoning

Distribution of Property Types

Distribution of Year Loans Maturing

Distribution of Amortization Type

Page 22 of 34

Property Types

# of

Loans

Scheduled

Balance

% of

Balance

WAMM WAC PFY DSCR

Office

660,092,271

41.33

5.40

0.00

Multifamily

344,446,919

21.57

5.58

0.00

Retail

245,734,218

15.39

118

5.45

0.00

Lodging

148,643,808

9.31

5.93

0.00

Industrial

93,882,719

5.88

123

5.38

0.00

Other

47,986,168

3.00

5.66

0.00

Self storage

24,134,607

1.51

116

5.75

0.00

Mixed use

17,880,000

1.12

5.27

0.00

Mobile home park

14,400,000

0.90

119

5.17

0.00

1,597,200,709

100.00

Amortization Type

# of

Loans

Scheduled

Balance

% of

Balance

WAMM WAC PFY DSCR

Amortizing/IO

24,878,765

1.56

173

5.84

0.00

AmortizingBalloon

508,005,006

31.81

104

5.74

0.00

Full Amortizing

11,060,938

0.69

236

5.86

0.00

IO Maturity Balloon

465,550,000

29.15

5.38

0.00

IO/Amortizing

587,706,000

36.80

109

5.38

0.00

1,597,200,709

100.00

Number of Months

# of

Loans

Scheduled

Balance

% of

Balance

WAMM WAC PFY DSCR

255,612,404

16.00

0.00

5.46

350,418,061

21.94

0.00

5.88

364,665,582

22.83

107

0.00

5.41

231,087,295

14.47

0.00

5.45

260,791,085

16.33

0.00

5.21

76,927,779

4.82

108

0.00

5.44

47,069,557

2.95

143

0.00

5.77

3,548,945

0.22

112

0.00

5.45

7,080,000

0.44

0.00

5.14

0.00

1,597,200,709

100.00

Year

# of

Loans

Scheduled

Balance

% of

Balance

WAMM WAC PFY DSCR

0.00

2005

0.00

2006

0.00

2007

0.00

2008

7,080,000

0.44

5.14

0.00

2009

652,971,116

40.88

5.56

0.00

2010

0.00

2011

7,500,000

0.47

5.30

0.00

2012

4,500,000

0.28

5.30

0.00

2013

21,239,738

1.33

113

5.73

0.00

2014

856,108,749

53.60

117

5.45

0.00

2015

47,801,107

2.99

180

5.72

0.00

2016 & Greater

100.00

1,597,200,709

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Delinquent Loan Detail

Disclosure

Control #

Paid
Thru
Date

Current P&I

Advance

Outst anding

P& I

Advances**

Out. Property

Protection
Advances

Loan Status

Code (1)

Special

Servicer

Transfer Date

Foreclosure

Date

Bankruptcy

Date

REO

Date

Statement Date:

Total

Page 23 of 34

A. In Grace Period

1. Delinq. 1 month

2. Delinq. 2 months

3. Delinquent 3 + months

4. Performing Matured Balloon

** Outstanding P&I Advances include the current period P&I Advances and may include Servicer and Trust Advances.

7. Foreclosure

9. REO

B. Late Payment but < 1 month delinq.

5. Non Performing Matured Balloon

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Historical Collateral Level Prepayment Report

Disclosure

Control #

Payoff

Period

Initial

Balance

Type

Payoff

Amount

Penalty

Amount

Prepayment

Date

Maturity

Date

Property

Type

Geographic

Location

Statement Date:

Cumulative

Current

Page 24 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Loan Level Detail

Disclosure

Control #

Group

Property

Type

Maturity

Date

PFY

DSCR

Operating
Statement

Date

Geo.

Location

Ending

Principal

Balance

Note
Rate

Scheduled

P&I

Prepayment

Amount

Prepayment

Date

Loan

Status

Code (1)

Statement Date:

5.13%

1-Feb-10

GMAC5C1A

Office

0.00

180,000,000

769,189

5.63%

1-Mar-10

GMAC5C1A

Office

0.00

100,000,000

469,216

5.46%

8-Jun-10

GMAC5C1B

Multifamily

0.00

100,000,000

455,000

6.44%

1-Nov-10

GMAC5C1A

Lodging

0.00

92,765,332

624,460

5.49%

1-Apr-15

GMAC5C1A

Office

0.00

79,686,000

364,563

5.44%

1-May-10

GMAC5C1A

Office

0.00

57,750,000

261,800

5.38%

1-Mar-15

GMAC5C1A

Office

0.00

56,070,000

251,381

5.19%

1-Apr-15

GMAC5C1A

Office

0.00

44,350,914

244,080

5.26%

1-Apr-15

GMAC5C1A

Industrial

0.00

21,500,000

94,242

5.26%

1-Apr-15

GMAC5C1A

Industrial

0.00

20,500,000

89,858

5.30%

1-Jan-15

GMAC5C1A

Lodging

0.00

27,000,000

119,250

5.84%

1-Apr-10

GMAC5C1A

Other

0.00

26,386,168

168,157

5.30%

1-Apr-15

GMAC5C1A

Retail

0.00

24,918,087

138,826

4.77%

1-Apr-15

GMAC5C1A

Lodging

0.00

24,908,860

130,653

5.84%

1-Dec-19

GMAC5C1A

Office

0.00

24,878,765

138,955

5.62%

1-Apr-10

GMAC5C1B

Multifamily

0.00

24,500,000

114,742

5.71%

1-May-10

GMAC5C1B

Multifamily

0.00

24,000,000

114,200

5.47%

1-Jun-15

GMAC5C1B

Multifamily

0.00

23,000,000

104,842

5.45%

1-Jan-15

GMAC5C1A

Other

0.00

21,600,000

98,100

6.72%

1-May-15

GMAC5C1B

Multifamily

0.00

21,366,504

137,368

5.11%

1-Apr-15

GMAC5C1B

Multifamily

0.00

21,250,000

90,490

5.35%

8-Apr-15

GMAC5C1A

Retail

0.00

20,760,000

92,555

4.96%

1-Mar-15

GMAC5C1B

Multifamily

0.00

19,750,000

81,633

Page 25 of 34

* NOI and DSCR, if available and reportable under the terms of the trust agreement, are based on information obtained from the related borrower, and no other party to the agreement shall be held liable for the accuracy or methodology used to

determine such figures.

(1) Legend:

A. In Grace Period

B. Late Payment but < 1 month delinq

1. Delinquent 1 month
2. Delinquent 2 months

3. Delinquent 3+ months

4. Performing Matured Balloon

7. Foreclosure

9. REO

5. Non Performing Matured Ballon

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Loan Level Detail

Disclosure

Control #

Group

Property

Type

Maturity

Date

PFY

DSCR

Operating
Statement

Date

Geo.

Location

Ending

Principal

Balance

Note
Rate

Scheduled

P&I

Prepayment

Amount

Prepayment

Date

Loan

Status

Code (1)

Statement Date:

6.69%

1-May-15

GMAC5C1B

Multifamily

0.00

19,169,691

122,765

5.35%

1-Mar-15

GMAC5C1A

Retail

0.00

17,500,000

78,021

5.95%

1-Apr-10

GMAC5C1A

Office

0.00

17,400,000

86,275

5.43%

1-May-15

GMAC5C1A

Retail

0.00

16,000,000

72,400

5.32%

1-Jun-15

GMAC5C1A

Industrial

0.00

14,880,000

65,906

5.01%

1-Feb-10

GMAC5C1A

Retail

0.00

14,500,000

60,538

5.17%

1-Jun-15

GMAC5C1A

Mobile home park

0.00

14,400,000

62,040

5.62%

1-Jun-15

GMAC5C1A

Retail

0.00

14,000,000

65,567

5.45%

1-May-15

GMAC5C1A

Office

0.00

13,971,122

79,052

5.35%

1-Feb-15

GMAC5C1B

Multifamily

0.00

13,600,000

60,633

5.47%

1-May-15

GMAC5C1B

Multifamily

0.00

13,500,000

61,549

5.27%

1-Jun-15

GMAC5C1A

Office

0.00

12,400,000

54,457

5.33%

1-Jun-15

GMAC5C1B

Multifamily

0.00

12,200,000

54,188

5.84%

1-Apr-15

GMAC5C1A

Office

0.00

12,164,239

71,895

5.35%

1-Apr-17

GMAC5C1A

Retail

0.00

11,861,404

66,451

5.80%

1-Jan-15

GMAC5C1B

Multifamily

0.00

11,210,960

66,188

5.43%

1-Apr-15

GMAC5C1A

Retail

0.00

10,999,252

67,396

5.54%

1-May-15

GMAC5C1A

Office

0.00

10,977,746

62,733

5.35%

1-Mar-15

GMAC5C1A

Mixed use

0.00

10,800,000

48,150

5.84%

1-Jun-15

GMAC5C1A

Retail

0.00

10,700,000

52,073

5.96%

1-Dec-14

GMAC5C1A

Self storage

0.00

10,365,505

67,203

5.35%

1-Feb-15

GMAC5C1A

Industrial

0.00

10,142,035

56,958

5.49%

1-Feb-15

GMAC5C1A

Retail

0.00

9,894,906

56,433

Page 26 of 34

determine such figures.

(1) Legend:

A. In Grace Period

B. Late Payment but < 1 month delinq

1. Delinquent 1 month
2. Delinquent 2 months

3. Delinquent 3+ months

4. Performing Matured Balloon

7. Foreclosure

9. REO

5. Non Performing Matured Ballon

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Loan Level Detail

Disclosure

Control #

Group

Property

Type

Maturity

Date

PFY

DSCR

Operating
Statement

Date

Geo.

Location

Ending

Principal

Balance

Note
Rate

Scheduled

P&I

Prepayment

Amount

Prepayment

Date

Loan

Status

Code (1)

Statement Date:

5.55%

1-May-15

GMAC5C1A

Retail

0.00

9,630,519

55,095

5.70%

1-Feb-15

GMAC5C1A

Retail

0.00

8,952,083

52,236

5.66%

1-Jun-15

GMAC5C1A

Retail

0.00

8,890,548

51,430

5.62%

1-Jun-15

GMAC5C1A

Retail

0.00

8,500,000

39,808

5.06%

1-Jan-10

GMAC5C1B

Multifamily

0.00

8,000,000

33,733

5.37%

1-Jun-15

GMAC5C1A

Retail

0.00

7,691,356

43,070

5.32%

1-Jun-15

GMAC5C1A

Industrial

0.00

7,760,000

34,370

5.30%

1-Mar-12

GMAC5C1A

Office

0.00

7,500,000

33,125

5.50%

1-Mar-15

GMAC5C1A

Office

0.00

7,329,821

41,789

5.53%

1-Dec-14

GMAC5C1B

Multifamily

0.00

7,325,288

42,042

5.28%

1-May-15

GMAC5C1B

Multifamily

0.00

7,250,000

31,900

5.62%

1-Jun-15

GMAC5C1A

Self storage

0.00

7,188,988

44,732

5.14%

1-Oct-09

GMAC5C1A

Mixed use

0.00

7,080,000

30,326

5.49%

1-Jun-15

GMAC5C1A

Office

0.00

6,712,631

38,113

5.54%

1-Apr-15

GMAC5C1A

Office

0.00

6,679,098

38,210

5.24%

1-Feb-15

GMAC5C1A

Office

0.00

6,561,723

36,405

5.16%

1-Mar-15

GMAC5C1A

Retail

0.00

6,250,000

26,875

5.82%

1-May-15

GMAC5C1A

Retail

0.00

6,123,325

36,075

5.63%

1-Apr-15

GMAC5C1A

Industrial

0.00

5,483,158

31,678

5.28%

1-May-15

GMAC5C1A

Office

0.00

5,188,877

28,811

5.66%

1-Jan-15

GMAC5C1A

Industrial

0.00

5,152,825

32,431

5.28%

1-May-15

GMAC5C1A

Retail

0.00

5,089,091

28,257

5.32%

1-Apr-15

GMAC5C1A

Retail

0.00

4,900,000

21,723

Page 27 of 34

determine such figures.

(1) Legend:

A. In Grace Period

B. Late Payment but < 1 month delinq

1. Delinquent 1 month
2. Delinquent 2 months

3. Delinquent 3+ months

4. Performing Matured Balloon

7. Foreclosure

9. REO

5. Non Performing Matured Ballon

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Loan Level Detail

Disclosure

Control #

Group

Property

Type

Maturity

Date

PFY

DSCR

Operating
Statement

Date

Geo.

Location

Ending

Principal

Balance

Note
Rate

Scheduled

P&I

Prepayment

Amount

Prepayment

Date

Loan

Status

Code (1)

Statement Date:

5.78%

1-May-15

GMAC5C1A

Retail

0.00

4,770,000

22,976

6.08%

1-Feb-25

GMAC5C1A

Industrial

0.00

4,500,707

32,808

5.30%

1-May-13

GMAC5C1B

Multifamily

0.00

4,500,000

19,875

5.45%

1-Jun-15

GMAC5C1A

Office

0.00

4,495,028

25,410

5.12%

1-May-15

GMAC5C1A

Retail

0.00

4,390,265

23,944

5.73%

1-Feb-10

GMAC5C1A

Lodging

0.00

3,969,615

25,116

5.71%

1-Jan-15

GMAC5C1A

Industrial

0.00

3,963,994

25,068

5.24%

1-Mar-15

GMAC5C1B

Multifamily

0.00

3,800,000

16,593

5.84%

1-May-15

GMAC5C1A

Retail

0.00

3,792,800

22,394

5.58%

1-Mar-25

GMAC5C1A

Retail

0.00

3,766,378

26,312

5.58%

1-May-10

GMAC5C1B

Multifamily

0.00

3,700,000

17,205

5.45%

1-Nov-14

GMAC5C1A

Retail

0.00

3,548,945

20,215

5.32%

1-May-15

GMAC5C1A

Office

0.00

3,492,577

19,479

5.74%

1-May-15

GMAC5C1A

Retail

0.00

3,390,309

21,369

5.41%

1-May-15

GMAC5C1A

Self storage

0.00

3,339,903

20,392

5.71%

1-Apr-15

GMAC5C1A

Self storage

0.00

3,240,211

18,884

5.78%

1-Apr-15

GMAC5C1B

Multifamily

0.00

3,140,650

18,443

5.88%

1-Jun-25

GMAC5C1A

Retail

0.00

2,793,853

19,867

5.35%

1-Feb-15

GMAC5C1A

Office

0.00

2,483,730

14,369

5.32%

1-Feb-15

GMAC5C1B

Multifamily

0.00

2,386,285

13,357

5.41%

1-Mar-15

GMAC5C1A

Retail

0.00

2,121,096

11,974

5.88%

1-Apr-15

GMAC5C1B

Multifamily

0.00

797,541

4,732

1,597,200,709

7,985,447

Page 28 of 34

determine such figures.

(1) Legend:

A. In Grace Period

B. Late Payment but < 1 month delinq

1. Delinquent 1 month
2. Delinquent 2 months

3. Delinquent 3+ months

4. Performing Matured Balloon

7. Foreclosure

9. REO

5. Non Performing Matured Ballon

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Specially Serviced (Part I) ~ Loan Detail (End of Period)

Disclosure

Control #

Servicing

Xfer Date

Balance

Note

Rate

Maturity

Date

Remaining

Property

Type

Geo.

Location

NOI

DSCR

NOI
Date

Schedule

Actual

Life

Statement Date:

Loan

Status

Code(1)

Page 29 of 34

(1) Legend:

A. P&I Adv - in Grace Period

B. P&I Adv - < one month delinq

1. P&I Adv - delinquent 1 month

2. P&I Adv - delinquent 2 months

3. P&I Adv - delinquent 3+ months

4. Mat. Balloon/Assumed P&I

7. Foreclosure

9. REO

5. Non Performing Mat. Balloon

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Specially Serviced Loan Detail (Part II) ~ Servicer Comments (End of Period)

Disclosure

Control #

Resolution

Strategy

Comments

Statement Date:

Page 30 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

Historical Collateral Level REO Report

Property

Type

Statement Date:

State

Actual

Balance

Scheduled

Balance

Recent

Appraisal

Value

Appraisal

Reduction

Amount

Date

Liquidated

Liquidation

Proceeds

Liquidation

Expenses

Realized

Loss

Disclosure

Control #

REO

Date

City

Appraisal

Date

ABN AMRO Acct: 722718.1

Page 31 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Modified Loan Detail

Disclosure

Control #

Modification

Date

Cutoff

Maturity

Date

Modification

Description

Modified

Maturity

Date

Statement Date:

Page 32 of 34

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Realized Loss Detail

Period

Disclosure

Control #

Appraisal

Date

Appraisal

Value

Beginning

Scheduled

Balance

Gross

Proceeds

Gross Proceeds

as a % of

Sched. Balance

Aggregate

Liquidation

Expenses *

Net

Liquidation

Proceeds

Net Proceeds

as a % of

Sched. Balance

Realized

Loss

Statement Date:

Current Total

Cumulative

Page 33 of 34

* Aggregate liquidation expenses also include outstanding P&I advances and unpaid servicing fees, unpaid trustee fees, etc..

GMAC Commercial Mortgage Securities, Inc.

Payment Date:
Prior Payment:
Next Payment:
Record Date:

11-Jul-05
11-Jul-05

N/A

10-Aug-05

30-Jun-05

Mortgage Pass-Through Certificates

Series 2005-C1

ABN AMRO Acct: 722718.1

Appraisal Reduction Detail

Disclosure

Control#

Appraisal

Red. Date

Scheduled

Balance

ASER

Note

Rate

Maturity

Date

Property

Type

Geographic

Location

Appraisal

Value Date

DSCR

Statement Date:

Remaining Term

Life

ARA

Amount

Current P&I

Advance

Page 34 of 34

GMAC Commercial Mortgage Securities, Inc. Series 2005-C1 Trust 8-K