FIRST ADDENDUM TO ADMINISTRATIVE SERVICES AGREEMENT

Exhibit 10.21

Final 6/1/07

FIRST ADDENDUM TO ADMINISTRATIVE SERVICES AGREEMENT

This First Addendum dated and effective as of June 1, 2007 (the “Addendum”) is made to the Administrative Services Agreement dated as of November 22, 2006 (the “Agreement”) by and between GMAC Mortgage, LLC (the “Affiliate”), a Delaware limited liability company, and GMAC Bank on behalf of itself and its subsidiaries, GMACB Asset Management Corp. and GMAC Wholesale Mortgage Corp (the “Bank” or “GMACB”), a Utah industrial bank.

Explanatory Statement

1. The Affiliate and the Bank wish to amend the Agreement to provide additional terms and conditions governing the Affiliate’s performance of Services on behalf of the Bank.

2. It is the intent of the Bank and the Affiliate that this Addendum comply with the requirements of Sections 23A and 23B of the Federal Reserve Act and the Federal Reserve Board’s Regulation W.

NOW, THEREFORE, in consideration of the mutual covenants and promises contained herein, the parties hereto, intending to be legally bound, hereby agree as follows:

1. The capitalized terms used herein, unless otherwise defined, shall have the meanings set forth in the Agreement.

2. Sub-section 1.1 of the Agreement is hereby amended and restated in its entirety as follows:

1.1 Applicable Requirements . Applicable Requirements means (a) all federal, state and local legal and regulatory requirements (including statutes, rules, regulations and ordinances) applicable to the Bank, (b) all other requirements and guidelines of FDIC, the Utah Department of Financial Institutions, and any other governmental body or officer having jurisdiction over the Bank, (c) all judicial and administrative judgments, orders, stipulations, awards, writs, and injunctions applicable to the Bank, (d) the Bank’s Affiliate Transaction Policy, as it may be amended from time to time.

3. Sub-section 6.3 of the Agreement is hereby amended and restated in its entirety as follows:

6.3 Information and Reports; Cooperation in Audits, Reviews and Inspections . The Affiliate shall prepare and deliver to the Bank, regularly and on a timely basis, such information and reports as the Bank shall reasonably request or require from time to time regarding any and all aspects of the Services. The Affiliate shall cooperate with the Bank and its accountants, auditors, fidelity and deposit insurance underwriters, and federal and state regulators and other similar parties in conducting such audits, reviews and inspections of the Services as the Bank and such parties shall reasonably require from time to time. Such cooperation shall include providing access upon reasonable notice to books, records, management, and physical locations of the Affiliate that pertain to the implementation of this Agreement.

4. Section 14 of the Agreement is hereby amended and supplemented by the insertion of the following sub-section 14.16:

14.16 Incorporation of Exhibits; Exhibits attached hereto shall be incorporated herein and shall be understood to be a part hereof as though included in the body of this Agreement.

5. Exhibit A to the Agreement is hereby amended and replaced in its entirety by the Schedule of Services attached as Exhibit A hereto.

6. Exhibit B to the Agreement is hereby deleted.

7. Any conflict between the provisions of this Addendum and those of the Agreement shall be resolved in favor of the provisions of this Addendum. Except as expressly set forth in this Addendum, no modification of the Agreement is made or intended to be made by this Addendum, and the Agreement, as amended by this Addendum, is confirmed and reaffirmed by the Affiliate and the Bank and shall be and remain in full force and effect.

IN WITNESS WHEREOF, each of the undersigned parties to this Addendum has caused this Addendum to be duly executed in its name by one of its duly authorized officers or members, all as of the date first above written.

2

Exhibit A

SCHEDULE OF SERVICES AND FACILITIES TO BE PROVIDED BY GMACM

GMACM shall be responsible for providing the following Services to GMAC Bank:

(A) Provide and/or facilitate payroll services for GMAC Bank, including maintenance of human resources and payroll systems, payroll processing, transmission of payroll interface file to accounting, payroll tax withholding and remittance, W-2 processing and filing;

(B) In connection with the employees referred to in clause (A) above, prepare and file, or cause to be prepared and filed, all federal, state and local payroll and wage tax returns and such reports and documents, make such payments and perform all other acts, as may be necessary or proper to comply with the terms and conditions of the Social Security, unemployment, workers’ compensation and all other applicable laws, ordinances and regulations of each jurisdiction in which they may be employed, except that the Bank will be responsible for filing all appropriate EEO-1 reports regarding the employees of GMAC Bank, and GMACM agrees to provide any necessary information from its payroll system to assist with said reports;

(C) Administer all benefits provided to employees and provide other human resources services, including, without limitation, administering and approving any compensation or benefit payments, establishing and administering personnel policies, providing employee relations services, providing training services; and

(D) Provide staffing resources to attract, interview and hire new employees of GMAC Bank, including, without limitation, approving new employees’ compensation.

All services identified above shall be provided to GMAC Bank and its subsidiaries at no charge.

A. Provide internal information technology services to GMAC Bank necessary for the operation of its business and, in connection therewith, purchase and maintain computer hardware, software, databases and all computer networks necessary to permit GMAC Bank to conduct its activities in a professional manner and service its clients and others with whom it may deal. GMACM represents and warrants to GMAC Bank that all of the data and other information obtained by GMAC Bank from its clients or others with whom it deals shall be held in strict trust and confidence and shall only be accessible by persons engaged in the operation of GMAC Bank’s business, unless otherwise specifically consented to in writing by GMAC Bank. GMACM acknowledges that a high level of confidentiality is necessary in order for GMAC Bank to compete effectively for clients and to have its reports acceptable to financial institutions and others for whom they are intended. GMACM will, therefore, secure such information and data within GMAC Bank’s information system so that it will not be accessible by unauthorized persons.

B. GMAC BANK INFORMATION TECHNOLOGY INFRASTRUCTURE OPERATIONS SERVICE AGREEMENT

GMAC Bank IT infrastructure operations are governed by a specific service agreement.

See attachment II for detailed terms and conditions.

C. Provide services of a qualified Chief Information Officer (“CIO”) and necessary support staffing to the Bank to serve as part of senior management, reporting directly to the President with matrix reporting roles within the GMACM/GMAC Residential IT organization. The CIO is responsible for bridging business needs and information technology, including working with the business to define their needs and provide cost-effective solutions. The CIO’s responsibilities include but are not limited to the following :

1) Providing strategic information technology direction and solutions to business partners in support of revenue generation, diversification, retention, and key bank programs and goals.

2) Working closely with the business leadership to define long term information technology vision.

3) Developing a comprehensive strategy for management information needs, including new systems solutions or major improvements to existing application systems, and related hardware acquisition and integration.

4) Directing all IT related strategic and tactical planning and systems implementation activities associated with the business.

5) Establishing, monitoring and enforcing policies and procedure direction, technical standards, methodologies, and priorities.

6) Working with GMACR finance and senior GMACR managers to develop appropriate cost allocations models, IT software development budgets, and cost reductions.

7) Managing IT vendor relationships.

8) Managing, planning and implementing applications development efforts including new and legacy systems, enhancements and maintenance.

9) Overseeing business requirement analysis and implementation, managing priorities, and ensuring standards of excellence and user satisfaction.

10) Providing cutting edge and relevant technology expertise for business development purposes to ensure a competitive edge.

11) Providing strategic and tactical planning, development, evaluation, and coordination of the information technology applications

D. Information Security Program and Policy.

See Attachments III for complete Information Security Program and Policy

All services identified above shall be provided to GMAC Bank and its subsidiaries at no charge.

Maintain appropriate records of all GMAC Bank activities hereunder and make such records available for inspection by the Bank, by counsel, regulators, auditors and authorized agents of GMAC Bank, upon prior written notice at any time during normal business hours. Consult with GMAC Bank and furnish advice and recommendations with respect to Generally Accepted Accounting Principles/Financial Reporting issues.

(A) Accounting Information Systems (AIS) . Daily monitoring of transaction feeds to General Ledger system. General Ledger system use, maintenance and user support. Ad hoc report preparation and testing as requested by GMAC Bank.

(B) Accounts Payable . Pay all authorized bills and charges incurred by GMAC Bank in the operation of its business, Invoice imaging and retrieval, 1099 processing, positive pay file procedures, vendor file maintenance and customer service related to all.

(C) Default. Preparation of OTS Schedules VA and PD quarterly, classification of assets, delinquency reporting, adequacy of loan loss reserves, other analysis and reporting as requested. Provide support for regulatory examinations and Audits. Provide support to GMAC Bank officers and staff for financial forecasting of credit loss and delinquency trends.

(D) Enterprise Reporting Accounting . Preparation of reconciliation for the following products in accordance with generally accepted accounting principles: Home equity Loans, Home Equity Lines, Home Equity Purchase Premium general accounts and Accrued Interest Receivable. Research and clearing of reconciliation items via journal entry.

(E) Fixed Assets . Load Fixed Assets to the system, perform Fixed Asset Reporting and monthly file maintenance and processing of journal entries.

(F) Lending Accounting . In accordance with generally accepted accounting principles, provide daily processing of loans purchased and sold by GMAC Bank as well as preparation of all necessary journal entries to record these transactions. Identification of loans on Bank’s balance sheet for elimination entries. Preparation of journal entries to record loan activity not related to sales or purchases.

(G) Tax . Prepare for execution, cause to be filed and pay such income, franchise, personal property or other tax returns and filings of GMAC Bank as shall be required to be filed by applicable law and/or as governed by agreements with affiliates. Provide tax planning advice where applicable and prepare tax accrual information as necessary to satisfy quarterly and annual estimated payments.

PRICING TERMS :

All services identified above shall be provided to GMAC Bank and its subsidiaries at no charge.

Provide daily cash and treasury management services as directed by GMAC Bank Treasurer, including daily reserve calculations, loan funding and wire activity as required by GMAC Bank in the operation of its business; Accurately record and report the cash position and results of GMAC Bank to Bank management. Provide short, medium and long term cash forecasting for three-year business model, as required by GMAC Bank ALCO. Provide necessary information required to complete quarterly thrift financial report. Assist/advise in interest rate risk analysis as required by OTS TB 13A; assist in analyzing results with Bank Treasury to ensure compliance with GMAC Bank’s Asset/Liability Committee guidelines.