GMACM MORTGAGE LOAN TRUST 2005-AR1
Not Applicable.
Not Applicable.
Not Applicable.
Not Applicable.
The registrant is not aware of any material legal proceeding with          respect to the company, the servicer or the trustee, as related to          the trust.
No matter was submitted to a vote or consent of Holders of the Offered          Certificates during the fiscal year covered by this report.  PART II
The  Trust  does  not issue stock.  There is  currently no  established          public  trading  for the  Certificates. As  of December 31,  2005,  the          number of holders of all classes of Notes was 30.
Not Applicable.
Not Applicable.
Not Applicable.
Not Applicable.
There  was  no change of accountants or  disagreement with  accountants          on  any  matter of  accounting  principles or  practices  or  financial          disclosure.
Not Applicable.
Not Applicable.                                        -2-    PART III
Not Applicable.
Not Applicable.
Not Applicable.
Not Applicable.
Not Applicable.  PART IV
(a)      Exhibit 31.1   Rule 13a-14(a)/15d-14(a) Certification           Exhibit 99.1   Annual Independent Accountants' Servicing Reports                         concerning servicing activities           Exhibit 99.2   Report of Management as to Compliance with Minimum                         Servicing Standards           Exhibit 99.3   Annual Statements of Compliance under the Pooling and                         Servicing Agreements           Exhibit 99.4   Aggregate Statement of Principal and Interest                         Distributions to Certificate Holders (b)      Not Applicable.  (c)      Not Applicable.                                       -3-      SIGNATURES  Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange Act of 1934,  the  registrant  has duly  caused  this report to be signed on its behalf  by the  undersigned,  there  unto duly  authorized,  on this 20th day of March, 2006.          By:  GMAC MORTGAGE CORPORATION, as Servicer          By:  /s/ Anthony N. Renzi              -------------------------        Name: Anthony N. Renzi       Title: Executive Vice President         Date: March 20, 2006                                          -4-   SUPPLEMENTAL  INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO SECTION 15(D) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED SECURITIES PURSUANT TO SECTION 12 OF THE ACT.  The  registrant  has not sent an annual report or proxy material to its security holders.  The registrant  will not be sending an annual report or proxy material to its security holders subsequent to the filing of this form.                                        -5-                                     EXHIBIT INDEX  Exhibit     Description - -------     -----------  31.1        Rule 13a-14(a)/15d-14(a) Certification  99.1        Annual Independent Accountants' Servicing Reports concerning             servicing activities  99.2        Report of Management as to Compliance with Minimum Servicing             Standards  99.3        Annual Statements of Compliance under the Pooling and Servicing             Agreements  99.4        Aggregate Statement of Principal and Interest Distributions to             Certificate Holders                                         -6-                                     Exhibit 31.1                                   CERTIFICATION                                 ---------------       I, Anthony N. Renzi, certify that:  1.   I have  reviewed  the annual  report on Form 10-K for the fiscal year ended      December 31, 2005, and all reports on Form 8-K containing  distribution  or      servicing  reports filed in respect of periods included in the year covered      by this annual report, of GMACM Mortgage Loan Trust 2005-AR1.  2.   Based on my knowledge,  the information in these reports, taken as a whole,      does not contain any untrue statement of a material fact or omit to state a      material  fact  necessary  to make  the  statements  made,  in light of the      circumstances  under which such  statements were made, not misleading as of      the last day of the period covered by that annual report;  3.   Based on my knowledge,  the distribution or servicing  information required      to be  provided  to the  trustee  by the  servicer  under the  pooling  and      servicing,  or  similar,  agreement,  for  inclusion  in these  reports  is      included in these reports;  4.   I am  responsible  for reviewing the  activities  performed by the servicer      under the pooling and  servicing,  or  similar,  agreement  and based on my      knowledge and the annual  compliance  review required under that agreement,      and except as  disclosed in the reports,  the  servicer has  fulfilled  its      obligations  under  that  agreement; and  5.   The  reports  disclose  all  significant   deficiencies   relating  to  the      servicer's  compliance with the minimum servicing  standards based upon the      report provided by an independent  public  accountant , after  conducting a      review in  compliance  with the  Uniform  Single  Attestation  Program  for      Mortgage  Bankers,  or similar  procedure,  as set forth in the pooling and      servicing,  or similar,  agreement,  that is included in these reports.       In giving the certifications above, I have reasonably relied on information provided to me by the following unaffiliated parties: JPMorgan Chase Bank, N.A.   By:    GMAC MORTGAGE CORPORATION   By:    /s/ Anthony N. Renzi         ------------------------  Name:  Anthony N. Renzi  Title: Executive Vice President  Date:  March 20, 2006                                       EXHIBIT 99.1                 Annual Independent Accountants' Servicing Reports                         Concerning Servicing Activities                          ------------------------------                                                  PricewaterhouseCoopers LLP                                                 PricewaterhouseCoopers Center                                                 300 Madison Avenue                                                 New York NY 10017                                                 Telephone (646) 741 3000                                                 Facsimile (813) 286 6000                         Report of Independent Accountants  To the Board of Directors and Shareholder of GMAC Mortgage Corporation:  We have examined management's  assertion about GMAC Mortgage Corporation and its subsidiaries  (the "Company")  compliance with the minimum  servicing  standards identified  in the Mortgage  Bankers  Association  of America's  Uniform  Single Attestation  Program for Mortgage  Bankers ("USAP") as of and for the year ended December 31, 2005 included in the accompanying management assertion (see Exhibit I).  Management is responsible  for the Company's  compliance with those minimum servicing standards. Our responsibility is to express an opinion on management's assertion about the Company's compliance based on our examination.  Our  examination  was  performed  in  accordance  with   attestation   standards established  by the  American  Institute of Certified  Public  Accountants  and, accordingly,  included examining,  on a test basis, evidence about the Company's compliance  with the  minimum  servicing  standards  and  performing  such other procedures as we considered necessary in the circumstances.  We believe that our examination  provides a reasonable  basis for our opinion.  Our examination does not provide a legal  determination on the Company's  compliance with the minimum servicing standards.  In our  opinion,  management's  assertion  that the  Company  complied  with the aforementioned minimum servicing standards as of and for the year ended December 31, 2005 is fairly stated, in all material respects.    /s/ PricewaterhouseCoopers, LLP  --------------------------------  PricewaterhouseCooper, LLP   March 21, 2006                                       EXHIBIT 99.2                    Report of Management as to Compliance with                           Minimum Servicing Standards                          ------------------------------   GMAC Mortgage                                                                 Exhibit I                     Management's Assertion Concerning Compliance                      with USAP Minimum Servicing Standards  March 21, 2006  As of and for the year ended December 31, 2005,  GMAC Mortgage  Corporation  and its subsidiaries (the "Company") have complied in all material respects with the minimum  servicing  standards set forth in the Mortgage  Bankers  Association of America's Uniform Single Attestation Program for Mortgage Bankers ("USAP").  As of and for this same  period,  the Company had in effect a fidelity  bond and errors and omissions  policies in the amounts of $350,000,000 and  $100,000,000, respectively.    /s/ Jim Hillsman  -------------------  Jim Hillsman  Chief Operating Officer  GMAC Residential Holding Corp   /s/ Dave Bricker  -------------------  Dave Bricker  Chief Financial Officer  GMAC Residential Holding Corp   /s/ Tony Renzi  -------------------  Tony Renzi  Executive Vice President,  National Servicing Administration  GMAC Residential Holding Corp                                         EXHIBIT 99.3                          Annual Statements of Compliance                    under the Pooling and Servicing Agreements                          -------------------------------  February 28, 2006  RESIDENTIAL ASSET MORTGAGE PRODUCTS DIANE WALLACE c/o JPMORGAN CHASE BANK 4 New York Plaza - 6th Floor New York, NY  10004  RE:  Annual Officers Statement of Compliance      Year Ending 2005      GMACM Investor Agreement #41232, Deal 2005-AR1  GMAC Mortgage Corporation ("GMACM") hereby certifies to the best of our knowledge and belief, that for the calendar year 2005:  1.   A  review  of the  activities  of the  Seller/Servicer  and of  performance      according  to  the   Seller/Servicer   contract  has  been  made under such      undersigned Officer's supervision. 2.   To the  best of the  undersigned  Officer's  knowledge,  and  based on such      review, the  Seller/Servicer  has fulfilled all its  obligations  under the      Guides for such year. 3.   GMACM is currently an approved FNMA and FHLMC Servicer in good standing. 4.   If applicable, GMACM has filed the information returns with respect to the      receipt of mortgage interest pursuant to Sections 6050H, 5060J and 6050P of      the Code,  received in a trade or  business,  reports of  foreclosures  and      abandonment's  of  any  Mortgaged  Property  and  the  information  returns      relating  to  cancellation  of  indebtedness  income  with  respect  to any      Mortgaged Property. 4.   All hazard,  flood, FHA mortgage  insurance and primary mortgage  insurance      premiums,  taxes,  ground rents,  assessments and other lienable items have      been paid in connection with the mortgaged properties. 5.   All property inspections have been completed as required. 6.   Compliance relative to Adjustable Rate Mortgages has been met. 7.   Fidelity Bond and Errors and Omissions  Insurance  coverage is current,  in      full force and effect.  Servicer:    GMAC Mortgage Corporation  By:          /s/ Michael Kacergis              ------------------------ Name:        Michael Kacergis  Title:       Manager              Enterprise Risk Management              Enterprise Servicing Group Risk and Compliance                                      EXHIBIT 99.4          Aggregate Statement of Principal and Interest Distributions to                                Certificate Holders                          -------------------------------          - -----------------------------------------------------------------------------------------------------------------------------------                                   DISTRIBUTION IN DOLLARS - ----------------------------------------------------------------------------------------------------------------------------------- CUSIP        ORIGINAL PRIN       PAID PRIN          PAID INT          TOTAL PAID     ENDING PRIN BALANCE    CERT POOL FACTOR - ----------------------------------------------------------------------------------------------------------------------------------- 76112BKK5   12,000,000.00          26,253.10         5,203.16          31,456.26        11,973,746.90          997.81224167 76112BKL3   34,000,000.00          74,383.79        14,742.26          89,126.05        33,925,616.21          997.81224147 76112BKY5    1,615,000.00           3,533.23           700.26           4,233.49         1,611,466.77          997.81224149 76112BKM1   81,923,000.00         165,603.54        39,825.17         205,428.71        81,757,396.46          997.97854644 76112BKN9  156,115,000.00         271,092.15        72,728.19         343,820.34       155,843,907.85          998.26350991 76112BKP4   21,512,000.00          26,835.42        10,400.13          37,235.55        21,485,164.58          998.75253719 76112BKS8    7,796,000.00             214.70         4,071.31           4,286.01         7,795,785.30          999.97246024 76112BKT6    3,198,000.00              88.07         1,670.10           1,758.17         3,197,911.93          999.97246091 76112BKU3    1,999,000.00              55.05         1,043.93           1,098.98         1,998,944.95          999.97246123 76112BKQ2   75,612,000.00          93,784.34        40,339.40         134,123.74        75,518,215.66          998.75966328 76112BKR0               -                  -             1.01               1.01                    -        1,000.00000000 76112BKV1    1,993,993.39              49.52           939.50             989.02         1,993,943.87          999.97516541 76112BKW9    1,399,000.00              38.52           730.60             769.12         1,398,961.48          999.97246605 76112BKX7      799,723.00              22.02           417.66             439.68           799,700.98          999.97246547 - -----------------------------------------------------------------------------------------------------------------------------------     -----END PRIVACY-ENHANCED MESSAGE-----