Custodial Agreement

THIS AGREEMENT, dated as of the date set forth on the cover page hereof, among UBS Warburg Real Estate Securities Inc. (the “Participant”), the Custodian whose name is set forth on the cover page hereof (the “Custodian”) and the Seller whose name is set forth on the cover page hereof (the “Seller”).

WHEREAS, the Participant, the Seller and the Custodian are parties to the Custodial Agreement, dated as of [ ] (the “Original Custodial Agreement”);

WHEREAS, in connection with the Original Custodial Agreement, the Participant agreed to purchase, from time to time, at its sole election from the Seller, Participation Certificates (as defined in the Original Custodial Agreement) representing 100% ownership interest in certain residential first mortgage loans; and

WHEREAS, in connection with the Original Custodial Agreement, the Seller was obligated to service the Mortgage Loans (as defined in the Original Custodial Agreement); and

WHEREAS, in connection with the Original Custodial Agreement, the Participant desired to have the Custodian (1) take possession of the mortgage notes evidencing the Mortgage Loans (as defined in the Original Custodial Agreement), along with certain other documents specified herein, as the custodian for and bailee of the Participant or any assignees of the Participant in accordance with the terms and conditions thereof and (2) act as authenticating agent for the Participation Certificates (as defined in the Original Custodial Agreement); and

WHEREAS, in connection with the Original Custodial Agreement, the Seller caused the Mortgage Loans (as defined in the Original Custodial Agreement) evidenced by a Participation Certificate (as defined in the Original Custodial Agreement) to back a Security (as defined in the Original Custodial Agreement), which the Participant or its designee may have received in substitution for the related Participation Certificate (as defined in the Original Custodial Agreement); and

WHEREAS, in connection with the Original Custodial Agreement, upon an assignment by the Participant to an assignee relating to the financing of the Participant’s purchase of Participation Certificates (as defined in the Original Custodial Agreement), the rights of the Participant under the Original Custodial Agreement shall have been exercisable solely by such assignee; and

WHEREAS, the Participant, the Custodian and the Seller desire to amend and restate the Original Custodial Agreement as provided herein;

NOW THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree that the Original Custodial Agreement be amended and restated in its entirety as follows:

WHEREAS, the Participant has agreed to purchase, from time to time, at its sole election from the Seller, participation certificates (the “Participation Certificates”) representing 100% ownership interest in certain residential first mortgage loans (the “Mortgage Loans”) pursuant to the terms and conditions of an Amended and Restated Mortgage Loan Participation Agreement, dated as of the date set forth on the cover page thereof (the “Participation Agreement”), between the Participant and the Seller; and

WHEREAS, the Seller is obligated to service the Mortgage Loans pursuant to the terms and conditions of the Participation Agreement; and

WHEREAS, the Participant desires to have the Custodian (1) take possession of the mortgage notes evidencing the Mortgage Loans, along with certain other documents specified herein, as the custodian for and bailee of the Participant or any assignees of the Participant in accordance with the terms and conditions hereof and (2) act as authenticating agent for the Participation Certificates; and

WHEREAS, the Seller will cause the Mortgage Loans evidenced by a Participation Certificate to back a Security (as defined below), which the Participant or its designee will receive in substitution for the related Participation Certificate; and

WHEREAS, upon an assignment by the Participant to an assignee relating to the financing of the Participant’s purchase of Participation Certificates, the rights of the Participant under this Agreement shall be exercisable solely by such assignee; and

As used in this Agreement, the following terms shall have the following meanings:

“Custodian”: The Custodian set forth on the cover page hereof and its permitted successors hereunder.

“Discount”: With respect to each Participation Certificate, the amount of the adjustment to the Trade Price of the related Security agreed upon by Seller and Participant to reserve for the possibility that Seller may be unable to perform its obligations under the Participation Agreement in accordance with their terms.

“Electronic Agent”: The electronic agent identified in the Electronic Tracking Agreement.

“Electronic Tracking Agreement”: The Electronic Tracking Agreement, substantially in the form set forth in Exhibit G hereto, dated as of the date hereof, among the Participant, the Seller, an electronic agent and Mortgage Electronic Registration Systems, Inc., as the same shall be amended, supplemented or otherwise modified from time to time; provided that if no Mortgage Loans are or will be MERS Designated Mortgage Loans, all references herein to the Electronic Tracking Agreement shall be disregarded.

“FHLMC Guide”: The Freddie Mac Sellers’ and Servicers’ Guide, as such Guide may hereafter from time to time be amended.

“FHLMC Mortgage Loan”: With respect to any FHLMC Participation Certificate or any FHLMC Security, a mortgage loan that is in Strict Compliance with the eligibility requirements specified for the applicable FHLMC Program described in the FHLMC Guide.

“FHLMC Participation Certificate”: With respect to the FHLMC Program, a certificate, in the form of Exhibit A, issued by Seller and authenticated by the Custodian, evidencing the 100% undivided ownership interest in the Mortgage Loans that are either (a) set forth on a copy of the FHLMC Form 11 (Mortgage Submission Schedule) attached to such Participation Certificate or (b) identified on a computer tape compatible with MIDANET as belonging to the mortgage loan pool described in such Participation Certificate.

“FHLMC Program”: The FHLMC Home Mortgage Guarantor Program or the FHLMC FHA/VA Home Mortgage Guarantor Program, as such Programs are described in the FHLMC Guide.

“FHLMC Security”: A modified pass-through mortgage-backed participation certificate, evidenced by a book-entry credit made by a Securities Intermediary that is a participant of the Federal Reserve Bank of New York, issued and guaranteed, with respect to timely payment of interest and ultimate payment of principal, by FHLMC and backed by a pool of FHLMC Mortgage Loans, in substantially the principal amount and with substantially the other terms as specified with respect to such FHLMC Security in the related Takeout Commitment, if any.

“FNMA” or “Fannie Mae”: Federal National Mortgage Association or any successor thereto.

“FNMA Guide”: The Fannie Mae MBS Selling and Servicing Guide, as such Guide may hereafter from time to time be amended.

“FNMA Mortgage Loan”: With respect to any FNMA Participation Certificate or any FNMA Security, a mortgage loan that is in Strict Compliance with the eligibility requirements specified for the applicable FNMA Program described in the FNMA Guide.

“FNMA Participation Certificate”: With respect to the FNMA Program, a certificate, in the form of Exhibit A, issued by Seller and authenticated by the Custodian and evidencing the 100% undivided ownership interest in the Mortgage Loans set forth on Fannie Mae Form 2005 (Schedule of Mortgages).

“FNMA Program”: The FNMA Guaranteed Mortgage-Backed Securities Programs, as described in the FNMA Guide.

“FNMA Security”: An ownership interest in a pool of FNMA Mortgage Loans, evidenced by a book-entry credit made by a Securities Intermediary that is a participant of the Federal Reserve Bank of New York, in substantially the principal amount and with substantially the other terms as specified with respect to such FNMA Security in the related Takeout Commitment, if any.

“GNMA Guide”: The GNMA Mortgage-Backed Securities Guide I or II, as such Guide may hereafter from time to time be amended.

“GNMA Mortgage Loan”: With respect to any GNMA Participation Certificate or any GNMA Security, a mortgage loan that is in Strict Compliance with the eligibility requirements specified for the applicable GNMA Program in the applicable GNMA Guide.

“GNMA Participation Certificate”: With respect to the GNMA Program, a certificate, in the form of Exhibit A, issued by Seller and authenticated by the Custodian and evidencing the 100% undivided ownership interest in the Mortgage Loans set forth on the Form HUD 11706 (Schedule of Pooled Mortgages).

“GNMA Program”: The GNMA Mortgage-Backed Securities Programs, as described in a GNMA Guide.

“GNMA Security”: A fully-modified pass-through mortgage-backed certificate guaranteed by GNMA, evidenced by a book-entry credit made by a Securities Intermediary that is a participant of The Depository Trust Company and backed by a pool of GNMA Mortgage Loans, in substantially the principal amount and with substantially the other terms as specified with respect to such GNMA Security in the related Takeout Commitment, if any.

“HUD”: The United States Department of Housing and Urban Development or any successor thereto.

“Initial Purchase Price”: With respect to each Participation Certificate, the Trade Price of the Security to be backed by the Mortgage Loans evidenced by the Participation Certificate less the Discount.

“Interim Funder”: With respect to each MERS Designated Mortgage Loan, the Person named on the MERS^® System as the interim funder pursuant to the MERS Procedures Manual.

“MERS Designated Mortgage Loan”: MERS Designated Mortgage Loan shall have the meaning assigned to such term in Section 3 of the Electronic Tracking Agreement; provided that no Mortgage Loan shall be considered a MERS Designated Mortgage Loan unless an Electronic Tracking Agreement shall have been entered into.

“MERS Identification Number”: The eighteen digit number permanently assigned to each MERS Designated Mortgage Loan.

“MERS Procedures Manual”: The MERS Procedures Manual attached as Exhibit B to the Electronic Tracking Agreement, as it may be amended, supplemented or modified from time to time.

“MERS Report”: The schedule listing MERS Designated Mortgage Loans and other information prepared by the Electronic Agent pursuant to the Electronic Tracking Agreement.

“MERS^® System”: The Electronic Agent’s mortgage electronic registry system, as more particularly described in the MERS Procedures Manual.

“MIDANET”: The FHLMC automated system by which sellers and servicers of mortgage loans to FHLMC transfer mortgage summary and record data or mortgage accounting and servicing information from their computer system or service bureau to FHLMC, as more fully described in the FHLMC Guide.

“Mortgage”: A mortgage, deed of trust or other security instrument securing a Mortgage Note.

“Mortgage Loan”: A GNMA Mortgage Loan, a FNMA Mortgage Loan or a FHLMC Mortgage Loan.

“Mortgaged Property”: The property subject to the lien of the Mortgage securing a Mortgage Note.

“Original Custodial Agreement”: Shall have the meaning assigned to such term in the recitals hereof.

“Participant”: UBS Warburg Real Estate Securities Inc. and its successors in interest, including, but not limited to, any lender, designee or Assignee to whom a Participation Certificate or a Security shall be pledged or assigned.

“Participation Certificate”: A GNMA Participation Certificate, a FNMA Participation Certificate or a FHLMC Participation Certificate.

“Securities Intermediary”: As defined in Section 8-102(a)(14) of the Uniform Commercial Code.

“Strict Compliance” shall mean compliance of the Seller and the Mortgage Loans with the requirements of the GNMA, FNMA or FHLMC Guide, as applicable and as amended by any agreements between the Seller and the Applicable Agency, sufficient to enable the Seller to issue and GNMA to guarantee, or FNMA or FHLMC to issue and guarantee a Security, provided, however, that, until copies of any such agreements between the Seller and the Applicable Agency have been provided to the Participant by the Seller, such agreements shall be deemed, as between the Seller and the Participant, not to amend the requirements of the GNMA, FNMA or FHLMC Guide as applicable.

“Successor Servicer”: An entity, that is a GNMA-approved issuer, a GNMA-approved servicer, a FHA-approved mortgagee, a VA-approved lender, a FNMA-approved lender or FHLMC-approved seller/servicer, as applicable, in good standing and designated by Participant, to replace Seller as issuer and servicer, mortgagee or seller/servicer of the Mortgage Loans or the Securities related thereto.

“Takeout Commitment”: A trade confirmation from the Takeout Investor to Seller confirming the details of a forward trade between the Takeout Investor and Seller with respect to one or more Securities, which trade confirmation shall be enforceable and in full force and effect, and shall be validly and effectively assigned to Participant pursuant to a trade assignment, and relate to pools of Mortgage Loans that satisfy the “good-delivery guidelines” of The Bond Market Association as set forth in the Association’s Uniform Practices Manual.

“Takeout Investor”: A securities dealer or other financial institution, acceptable to Participant, who has made a Takeout Commitment.

“Trade Price”: The price specified in a Takeout Commitment at which a Takeout Investor is obligated to purchase the Security specified in such Takeout Commitment.

“Warehouse Lender”: Any lender providing financing to the Seller for the purpose of originating Mortgage Loans, which lender has a security interest in such Mortgage Loans as collateral for the obligations of the Seller to such lender.

“Wire Instructions”: The wire instructions set forth in a letter, in the form of Exhibit E, executed by the Seller, the Warehouse Lender and the Custodian, receipt of which has been acknowledged by the Participant.

Section 2. Delivery of Documents. (a) The Seller has delivered and released, or will deliver and release, to the Custodian the documents identified in the succeeding paragraph pertaining to each of the Mortgage Loans identified in the Mortgage Loan Schedule (“Mortgage Loan Schedule”) attached to each Participation Certificate that may be issued from time to time pursuant to the Participation Agreement. A copy of each such Mortgage Loan Schedule has been, or will be, delivered by the Seller to the Custodian at or before the time of delivery to the Custodian of such documents related to the Mortgage Loans identified in such Mortgage Loan Schedule. In addition, with respect to MERS Designated Mortgage Loans, the Seller has delivered, or will deliver, to the Custodian the related MERS Report.

No Participation Certificate shall be authenticated hereunder unless the Seller shall have delivered to the Custodian the related Mortgage Loan Schedule and each of the following with respect to the Mortgage Loans identified in such Mortgage Loan Schedule, in form and content acceptable to the Participant:

(A) The original Mortgage bearing evidence that the Mortgage has been duly recorded in the records of the jurisdiction in which the Mortgaged Property is located; or

(B) A copy of the Mortgage together with an officer’s certificate (which may be a blanket officer’s certificate of Seller covering all such Mortgage Loans), or a certificate from the recorder’s office, certifying that such copy represents a true and correct reproduction of the original Mortgage and that such original has been duly recorded or delivered for recordation in the appropriate records of the jurisdiction in which the Mortgaged Property is located; or

(C) With respect to each MERS Designated Mortgage Loan, the requirements set forth in the Electronic Tracking Agreement have been satisfied;

The Mortgage Loan documents referred to in clause (i), (ii), (iii), (iv) and (v) of this Section 2(a), are referred to herein as the “Mortgage File”, provided, however, that upon transmission by the Custodian by overnight courier of the document referenced in clause (i) of Section 2(a) to FHLMC when the Seller has appointed FHLMC as custodian, the Mortgage File shall not include the document referenced in clause (i) of Section 2(a). The Seller shall promptly deliver to the Custodian all additional original documents evidencing an assumption or modification of a Mortgage Loan approved by the Seller.

(b) In addition, the Seller shall (i) on the date of this Agreement, deliver to Custodian a certificate as to the incumbency and signature of each officer of the Seller executing any document in connection with this Agreement or the Participation Agreement and, thereafter, whenever there is a change in such certificate; and (ii) in respect of each Mortgage Loan identified in each Mortgage Loan Schedule and prior to the authentication by the Custodian of the related Participation Certificate, (A) deliver to the Custodian for transmission to GNMA, FNMA or FHLMC, as the case may be, the documents listed in Exhibit C-1, Exhibit C-2 or Exhibit C-3, as applicable (the “Applicable Agency Documents”), which documents shall be fully completed and executed and sufficient to permit GNMA, FNMA or FHLMC, as the case

may be, to deliver a Security in respect of the related Mortgage Loans, and (B) deliver to Participant a copy of the Seller’s letter to Custodian listing all Applicable Agency Documents delivered by the Seller to the Custodian with respect to such Participation Certificate and in compliance with this Section 2(b).

(c) The Custodian, in accordance with the provisions of Section 4, shall deliver to GNMA, FNMA or FHLMC, as the case may be, within one (1) business day of Certification (as defined below) the Applicable Agency Documents, fully completed and executed and sufficient to permit GNMA, FNMA or FHLMC, as the case may be, to deliver a Security in respect of the related Mortgage Loans. If the Custodian, for any reason whatsoever, is unable to complete and/or deliver the Applicable Agency Documents in compliance with this Section 2(c), the Custodian shall give prompt oral notice thereof to the Participant, followed by written notice specifying the reason(s) therefor, which notice shall be delivered via facsimile transmission on the same day that oral notice is given.

Section 3. Custodian as Custodian for, and Bailee of, Participant and Assignees. (a) With respect to each Mortgage Note and each Assignment of Mortgage (except with respect to MERS Designated Mortgage Loans) and all other documents constituting each Mortgage File which are delivered to the Custodian or which at any time come into the possession of the Custodian, the Custodian, subject to the provisions of paragraphs (b) and (c) of this Section, shall act solely in the capacity of custodian for, and bailee of, the Participant. The Custodian shall hold all documents constituting the Mortgage File received by it for the exclusive use and benefit of the Participant, and shall make disposition thereof only in accordance with the written instructions furnished by the Participant. The Custodian shall segregate and maintain continuous custody of all documents constituting the Mortgage File received by it in secure and fire-resistant facilities in accordance with customary standards for such custody and shall mark the file folders therefor to indicate that the Mortgage File is being held for the Participant. Notwithstanding anything in this Section 3 to the contrary, upon delivery of a Security to the Participant or its designee, the Custodian shall automatically cease to hold the related Mortgage File on behalf of the Participant, and this Agreement shall thereupon cease to be of any effect with respect thereto.

(b) With respect to each Participation Certificate and/or each related Mortgage Note, Assignment of Mortgage and related Security, the Participant shall, upon assigning, pledging or granting a security interest therein to an Assignee, notify the Custodian and such Assignee in writing that it has assigned, pledged or granted a security interest in each Participation Certificate and/or each related Mortgage Note, Assignment of Mortgage and related Security to such Assignee. Subject to any limitations in any agreement between such Assignee and the Participant, such Assignee, upon notice, as provided in Section 17, may (i) require the Custodian to act with respect to the related Mortgage File solely in the capacity of custodian for, and bailee of, such Assignee, (ii) require the Custodian to hold such Mortgage File for the exclusive use and benefit of such Assignee, (iii) assume the rights of Participant under this Agreement to furnish written instructions to the Custodian as to the disposition of such Mortgage File and such rights shall be exercisable solely by such Assignee, (iv) require the Custodian to give such Assignee written acknowledgement to the effect set forth in (i), (ii) and (iii), and (v) take all such actions under the Electronic Tracking Agreement which are necessary to effectuate any of the foregoing. The failure of the Custodian to give the written acknowledgement referred

to in (iv) above shall not affect the validity of such assignment, pledge or grant of a security interest. The effects of the Participant’s notice to the Custodian set forth in (i) to (iii) above shall continue until the Custodian is otherwise notified in writing by such Assignee, except that upon the delivery of the Security to the Participant or its designee, the Custodian shall automatically cease to hold the Mortgage File on behalf of the Assignee, and this Agreement shall thereupon cease to be of any effect with respect thereto. Mortgage Notes and Assignments of Mortgages as to which the Participant has assigned, pledged or granted a security interest to an Assignee are sometimes referred to in this Agreement as “Assigned Mortgage Loans.”

(c) The Seller and the Participant acknowledge that the Warehouse Lender, if any, identified from time to time in each Exhibit B-1 Letter to be received by the Custodian pursuant to Section 2(a), is a Warehouse Lender for the Seller. The Seller and the Participant acknowledge that, in accordance with the terms of each Exhibit B-1 Letter to be received by the Custodian pursuant to Section 2(a) (except when the Warehouse Lender is the Participant), pursuant to which each such Warehouse Lender conditionally releases its security interest in Mortgage Loans referred to in the related Exhibit B-1 Letter, such release shall not be effective until the funds referred to in such Exhibit B-1 Letter (a “Warehouse Payment”) are received in accordance with the Wire Instructions. Until receipt of a Warehouse Payment, the interest of the related Warehouse Lender in such Mortgage Loans shall continue and remain in full force and effect, and the Participant shall have no interest in the Mortgage Loans which is not subordinate to the interest of each Warehouse Lender in such Mortgage Loans. The Seller and the Participant acknowledge and agree to the foregoing arrangements.

(d) In order to enable the Custodian to make the Certification described in Section 4(a), Participant shall, promptly after the execution of this Agreement, deliver to Custodian a limited power of attorney, in the form of Exhibit D (the “Limited Power”), authorizing the Custodian, as attorney-in-fact of the Participant, upon receipt of Exhibit F letter, if applicable (i) to complete a new form HUD 11711A (Release of Security Interest), Fannie Mae Form 2004 (Security Release Certification), FHLMC Form 939 (Security Settlement Information and Delivery Authorization) or FHLMC Form 996 (Warehouse Lender Release of Security Interest), as applicable, naming the Participant as the “warehouse lender” on each such form with respect to the applicable Mortgage Loans; (ii) to substitute such completed forms for the corresponding forms, if any, previously delivered to the Custodian by the Seller, naming a person other than the Participant as “warehouse lender;” and (iii) to include such completed substituted forms among the documents to be delivered by the Custodian pursuant to Section 4(a)(ii).

Section 4. Certification of Receipt by Custodian. (a) Prior to authenticating a Participation Certificate, the Custodian shall ascertain that all documents required to be delivered to it pursuant to Section 2 in respect of each Mortgage Loan Schedule are in its possession and shall certify (the “Certification”) to Participant that:

As to each MERS Designated Mortgage Loan, the Custodian shall verify the related “MERS Identification Number” listed on the related Mortgage Note, the Mortgage Loan Schedule and the MERS Report.

Upon receipt of all the documents required to be delivered to it pursuant to Section 2, Custodian shall execute the Participation Certificate and deliver to Participant by overnight courier the fully completed Participation Certificate and Mortgage Loan Schedule attached thereto, a copy of each Exhibit B-1 Letter or Exhibit B-2 Letter and a fully completed copy of (i) Form HUD 11705 (Schedule of Subscribers), (ii) Fannie Mae Form 2014 (Delivery Schedule) or (iii) a copy of FHLMC Form 381 (Contract Delivery Summary) and a copy of FHLMC Form 939 (Settlement and Information Multiple Registration Form), as the case may be, designating the Participant as the party authorized to receive the Securities, executed by the Seller and relating to the Securities to be backed by the Mortgage Loans. The execution by the Custodian of each Participation Certificate shall constitute an express representation and warranty by the Custodian to the Participant that the Custodian has performed the Certification with respect to the Participation Certificate, the Mortgage Loans evidenced thereby and the documents referenced in Section 2 received from the Seller in connection therewith.

Section 5. Custodian’s Fees and Expenses; Successor Custodian. (a) It is understood that the Custodian will charge such fees for its services under this Agreement as are set forth in a separate agreement between the Custodian and the Seller, the payment of which, together with the Custodian’s expenses in connection herewith, shall be solely the obligation of the Seller. The Custodian has no lien on, and shall not attempt to place a lien on, any of the Mortgage Loans or proceeds thereof to secure the payment of its fees.

(b) The Custodian or any successor Custodian may resign at any time by giving 30 days’ written notice to the Seller and the Participant. Such resignation shall take effect upon (i) the appointment of a successor Custodian by the Seller, which successor Custodian shall be a bank or trust company acceptable to the Participant, each Assignee and to GNMA, FNMA or FHLMC, as applicable, and (ii) delivery of all the Mortgage Files to the successor Custodian.

(c) The Seller may (and shall, upon the written request of the Participant) at any time remove and discharge the Custodian or any successor Custodian thereafter appointed from the performance of its duties under this Agreement by written notice from the Seller to the Custodian or the successor Custodian, with copies to the Participant. Such removal shall take effect upon (i) the appointment of a successor Custodian by the Seller, which Custodian shall be a bank or trust company acceptable to the Participant, each Assignee and to GNMA, FNMA or FHLMC, as applicable, and (ii) delivery of all the Mortgage Files to the successor Custodian.

(d) In the event of any such resignation or removal, the Custodian shall, at the expense of the Seller, promptly transfer to the successor Custodian within thirty (30) days all Mortgage Files being administered under this Agreement and the successor Custodian shall hold such Mortgage Files in accordance with this Agreement. In the event of any such appointment, the Seller shall be responsible for the fees of the successor Custodian.

(e) The Seller agrees to indemnify, reimburse and hold harmless the Custodian, its directors, officers, employees and agents from and against any and all liability, loss and expense, including counsel fees and disbursements arising from or connected with the Custodian’s execution and performance of this Agreement including but not limited to claims of third parties, including the Participant, except in the case of loss, liability or expenses resulting from the gross negligence or willful misconduct on the part of the Custodian. The foregoing indemnification shall survive the termination or assignment of this Agreement.

(f) The standard of care to be exercised by Custodian in the performance of its duties under this Agreement shall be to exercise the same degree of care as Custodian exercises when it holds mortgage loan documents as security for its own loans, if any, or warehouse loans. Custodian is an agent, bailee and custodian only and is not intended to be, nor shall it be construed to be (except only as agent, bailee and custodian), a representative, trustee or fiduciary of or for either Seller, the Agency, Participant or Assignee. The Custodian shall not be bound in any way by any agreement or contract other than this Agreement and the exhibits and schedules hereto and any other agreement to which it is a party. The Custodian shall not be

required to ascertain or inquire as to the performance or observance of any of the conditions or agreements to be performed or observed by any other party, except as specifically provided in this Agreement and the exhibits and schedules hereto. The Custodian disclaims any responsibility for the validity or accuracy of the recitals to this Agreement and any representations and warranties contained herein, unless specifically identified as recitals, representations or warranties of the Custodian.

Section 6. Default. If the Seller fails to fulfill any of its obligations under the Participation Agreement, the Electronic Tracking Agreement or hereunder or in connection with the exercise by Participant of any remedy pursuant to Section 3(c) of the Participation Agreement then, subject to the provisions of Section 3(b), the Participant may, by written notice to the Custodian, (a) require the Custodian to complete the endorsements on the Mortgage Notes held by the Custodian and/or (b) require the Custodian to deliver to Participant or Successor Servicer the Mortgage Files to which the failure relates and (c) take such actions under the Electronic Tracking Agreement on behalf of the Purchaser as are necessary to effectuate the foregoing.

Section 7. Access to Documents. Upon reasonable prior written notice to the Custodian, the Participant (and with respect to Assigned Mortgage Loans, each Assignee) and their agents, accountants, attorneys and auditors will be permitted during normal business hours to examine and copy the Mortgage Files, documents, records and other papers in possession of or under the control of the Custodian relating to any or all of the Mortgage Loans in which the Participant has an interest. Upon the written request of the Participant (and with respect to Assigned Mortgage Loans, each Assignee) and at the cost and expense of the Participant, the Custodian shall provide the Participant (and with respect to Assigned Mortgage Loans, each Assignee) with copies of the Mortgage Notes, Mortgages, Assignment of Mortgages and other documents relating to any of the Mortgage Loans in which the Participant (and with respect to Assigned Mortgage Loans, each Assignee) has an interest.

Section 8. Assignment by Participant. The Participant may assign, pledge or grant a security interest in any or all of its rights under this Agreement and the Electronic Tracking Agreement to one or more Assignees in connection with the assignment, pledge or grant of a security interest in a Participation Certificate, and/or related Mortgage Notes, Assignments of Mortgages and related Security. In addition to the notice required by Section 3(b), the Participant shall give written notice thereof to the Seller and the Custodian. The failure of the Participant to give such notice shall not affect the validity of any such assignment, pledge or grant of a security interest. If the Participant does, however, fail to give such notice to the Seller and the Custodian, then the Assignee may give such notice to the Seller and the Custodian. Upon receipt of such notice by the Seller and the Custodian, copies of all communications required to be sent hereunder to the Participant shall be sent to both the Participant and each Assignee (at its address set forth in such notice of assignment). Subject to any limitations in any agreement between such Assignee and the Participant, such Assignee may, upon notice as provided in Section 16 hereof, directly enforce and exercise such rights under this Agreement that have been assigned or pledged to it or are the subject of a security interest granted to it and, until otherwise notified by such Assignee, the Participant shall no longer have any of such rights.

Section 9. Insurance. The Custodian shall, at its own expense, maintain at all times during the existence of this Agreement (a) fidelity insurance, (b) theft of documents insurance, (c) forgery insurance and (d) errors and omissions insurance. All such insurance shall be in amounts, with standard coverage and subject to deductibles, all as is customary for insurance typically maintained by banks which act as custodians and be in such amounts and with insurance companies reasonably acceptable to the Participant. A certificate of the respective insurer as to each such policy, with a copy of such policy attached, shall be furnished to the Participant, upon request, containing the insured’s statement or endorsement that such insurance shall not terminate prior to receipt by the Participant, by registered mail, of 30 days’ notice thereof.

Section 10. Representations, Warranties and Covenants of the Custodian. The Custodian hereby represents and warrants to, and covenants with, the Seller and the Participant that, as of the date hereof and at all times while Custodian is performing services under this Agreement:

(a) The Custodian is duly organized, validly existing and in good standing under the laws of the jurisdiction of its incorporation and fully satisfies the requirements for acting as a GNMA custodian, a FNMA custodian and a FHLMC custodian, and

(b) The Custodian has the full power and authority to hold each Mortgage Loan and to execute, deliver and perform, and to enter into and consummate all transactions contemplated by, this Agreement, has duly authorized the execution, delivery and performance of this Agreement and has duly executed and delivered this Agreement, and this Agreement constitutes a legal, valid and binding obligation of the Custodian, enforceable against it in accordance with its terms.

(c) Neither the execution and delivery by the Custodian of this Agreement, nor the consummation by the Custodian of any of the transactions contemplated hereby, nor the fulfillment by the Custodian of the terms hereof, will conflict with, or violate, result in a material breach of or constitute a material default (with or without notice or lapse of time, or both) under (i) any term or provision of the Certificate of Incorporation or By-laws of the Custodian or any governmental rule applicable to the Custodian or (ii) any term or provision of any indenture or other agreement or instrument, to which the Custodian is a party or by which the Custodian or any material portion of its properties are bound. No governmental action is required by or with respect to the Custodian in connection with the execution and delivery of this Agreement by the Custodian or the consummation by the Custodian of the transactions contemplated hereby.

(d) As of the date hereof, with respect to the Original Custodial Agreement, no default has occurred and is continuing with respect to the Custodian.

Section 11. Indemnification by Custodian. The Custodian agrees to indemnify and hold the Seller and Participant, and their respective designees harmless against any and all liabilities, obligations, losses, damages, penalties, actions, judgements, suits, costs, or out-of-pocket expenses, including reasonable attorney’s fees, that may be imposed on, incurred by, or asserted against it or them in any way relating to or arising out of the Custodian’s gross negligence or willful misconduct or any breach of the covenants, conditions, representations or warranties contained herein. The foregoing indemnification shall survive any termination or assignment of this Agreement.

Section 12. No Adverse Interests. By its acceptance of each Mortgage File, the Custodian covenants and warrants to the Participant that the Custodian holds no adverse interests, by way of security or otherwise, in the related Mortgage Loan and the Custodian hereby waives and releases any such interest in such Mortgage Loan which it, acting as Custodian, has or which it may thereafter acquire prior to the time of release of such Mortgage Loan from the terms of this Agreement.

Section 13. Amendments. This Agreement may be amended from time to time only by written agreement of the Seller, the Participant and the Custodian except that, if this Agreement or any Participation Certificate shall have been assigned by Participant, no amendment shall affect any Mortgage Loans that relate to Participation Certificates that have been so assigned. Participant shall give at least five days’ prior written notice to each Assignee of any proposed amendment to this Agreement and shall furnish each Assignee with a copy of each such amendment within five days after it is executed and delivered.

Section 14. Recordation of Agreement. To the extent permitted by applicable law, this Agreement shall be filed and/or recorded by the Seller at its expense in all appropriate public offices on direction by the Participant accompanied by an opinion of counsel to the Participant (who may also be counsel employed by the Participant) to the effect that such filing and/or recordation would materially and beneficially affect the interests of the Participant.

Section 15. Execution in Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same instrument.

Section 16. Agreement for Exclusive Benefit of Parties; Assignment. This Agreement is for the exclusive benefit of the parties hereto and their respective successors and permitted assigns hereunder and shall not be deemed to give any legal or equitable right, remedy or claim to any other person whatsoever. This Agreement shall bind the parties hereto and their respective successors, but, except as provided in Section 9, shall not be assigned or pledged by any party without the prior written consent of the other parties. Written notice from an Assignee to the Custodian (with a copy to the Participant) that the Participant has defaulted in any material respect under any funding or loan agreement relating to the financing of the Participant’s purchase of Participation Certificates shall be conclusive for all purposes of this Agreement and after receipt of such notice, the Custodian shall act in accordance with the written instructions of the Assignee with respect to the related Mortgage Files.

Section 17. Effect of Invalidity of Provisions. In case any one or more of the provisions contained in this Agreement should be or become invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein or therein shall in no way be affected, prejudiced or disturbed thereby.

Section 18. Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of New York, without regard to conflict of laws rules.

Section 19. Consent to Service. Each party irrevocably consents to the service of process by registered or certified mail, postage prepaid, to it at its address given in or pursuant to Section 23.

Section 20. Submission to Jurisdiction. With respect to any claim arising out of this Agreement each party (a) irrevocably submits to the nonexclusive jurisdiction of the courts of the State of New York and the United States District Court located in the Borough of Manhattan in New York City, and (b) irrevocably waives (i) any objection which it may have at any time to the laying of venue of any suit, action or proceeding arising out of or relating hereto brought in any such court, (ii) any claim that any such suit, action or proceeding brought in any such court has been brought in any inconvenient forum and (iii) the right to object, with respect to such claim, suit, action or proceeding brought in any such court, that such court does not have jurisdiction over such party.

Section 21. Jurisdiction Not Exclusive. Nothing herein will be deemed to preclude either party hereto from bringing an action or proceeding in respect of this Agreement in any other jurisdiction other than as set forth in Section 20.

Section 22. Waiver of Jury Trial. Each party hereto irrevocably waives, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to this Agreement, any other agreement or the transactions contemplated hereby or thereby.

Section 23. Notices. Any notices, consents, directions and other communications given under this Agreement shall be in writing and shall be deemed to have been duly given when personally delivered at, or mailed by first-class mail, postage prepaid and sent to the addresses of the parties hereto set forth on the cover page hereof or such other address as any party shall give in a notice to the other parties pursuant to this Section.

Section 24. Authentication. No Participation Certificate shall be valid unless authenticated by the manual signature of an authorized officer of the Custodian. The Custodian hereby acknowledges that each time it authenticates a Participation Certificate, it is making an express representation and warranty to the Participant that it has performed the Certification as specified in Section 4(a).

Section 25. Construction. The headings in this Agreement are for convenience only and are not intended to influence its construction. References to Sections and Exhibits in this Agreement are to the Sections of and Exhibits to this Agreement. The Exhibits are part of this Agreement. In this Agreement, the singular includes the plural, the plural the singular, and the words “and” and “or” are used in the conjunctive or disjunctive as the sense and circumstances may require.

Section 26. Effect of Amendment and Restatement. Upon the execution of this Agreement and the Participation Agreement by all parties hereto and thereto, the Original Custodial Agreement shall be amended, restated and superseded in its entirety by this Agreement. The parties hereto acknowledge and agree that (a) the liens and security interests granted under the Original Custodial Agreement are in full force and effect and, upon the amendment and restatement of the Original Custodial Agreement and the related documents, such liens and security interests secure and continue to secure the payment and performance of Seller’s obligations under this Agreement and the related documents, (b) upon the effectiveness of such amendment and restatement, all outstanding Mortgage Loans under, and as defined in, the Original Custodial Agreement, shall be deemed to be outstanding as Mortgage Loans hereunder mutatis mutandis, in each case on the terms and conditions set forth in this Agreement, and (c) upon the effectiveness of such amendment and restatement, all outstanding Participation Certificates under, and as defined in the Original Custodial Agreement, shall be deemed to be outstanding as Participation Certificates hereunder mutatis mutandis, in each case on the terms and conditions set forth in this Agreement.

IN WITNESS WHEREOF, the Seller, the Participant and the Custodian have caused this Agreement to be duly executed as of the date and year first above written.

CRESCENT MORTGAGE SERVICES, INC.

By:		/s/
Name: Title: Telephone No.: Telecopy No.:

UBS WARBURG REAL ESTATE SECURITIES INC.

By:		/s/
Name: Title: Telephone No.: Telecopy No.:		George A. Mangiaracina Executive Director (212) 713-3734



By:		/s/
Name: Title: Telephone No.: Telecopy No.:		Robert Carpenter Director (212) 713-8749

JPMORGAN CHASE BANK

By:		/s/
Name: Title: Telephone No.: Telecopy No.:

This Certificate is evidence that a one hundred percent (100%) undivided ownership interest in (including the right to receive the payments of principal of and interest on) the Mortgage Loans identified on the attached:

has been sold to Participant pursuant to the terms of that certain Amended and Restated Mortgage Loan Participation Agreement, dated January 31, 2003 (the “Agreement”) between CRESCENT MORTGAGE SERVICES, INC., as Seller, and UBS WARBURG REAL ESTATE SECURITIES INC., as Participant. Initially capitalized terms used herein and not defined herein shall have the meanings given them in the Agreement, the terms of which are hereby incorporated by reference and made a part of this Participation Certificate.

Upon Delivery of the related Security to Participant or its Assignee, Participant’s interest in the Mortgage Loans backing such Security shall cease.

This Participation Certificate may be amended only by a written agreement between Seller and Participant.

CRESCENT MORTGAGE SERVICES, INC.

By:
Its: Date:

AGGREGATE PRINCIPAL BALANCES OF THE MORTGAGE LOANS (GIVING EFFECT TO PAYMENTS MADE AS OF , 20 ): $


By:
Its:
Date:

Capitalized terms used herein but not defined herein shall have the meanings ascribed to such terms in the Amended and Restated Custodial Agreement, dated as of January 31, 2003, among UBS Warburg Real Estate Securities Inc., Crescent Mortgage Services, Inc. and JPMorgan Chase Bank.

We hereby release all right, interest or claim of any kind with respect to the mortgage loans referenced in the attached schedule (GNMA/FNMA/FHLMC Pool/Contract # ), such release to be effective automatically without any further action by any party, upon payment, in one or more installments, from UBS Warburg Real Estate Securities Inc., in accordance with the Wire Instructions in effect on the date of such payment, in immediately available funds, of an aggregate amount equal to the product of A multiplied by B (such product being rounded to the nearest $0.01) multiplied by C.*

Capitalized terms used herein but not defined herein shall have the meanings ascribed to such terms in the Amended and Restated Custodial Agreement, dated as of January 31, 2003, among UBS Warburg Real Estate Securities Inc. (the “Participant”), Crescent Mortgage Services, Inc. and JPMorgan Chase Bank.

With respect to the mortgage loans referenced in the attached schedule (GNMA/FNMA, FHLMC Pool/Contract # ), (a) we hereby certify to you that the mortgage loans are not subject to a lien of any Warehouse Lender and (b) we hereby release all right, interest or claim of any kind with respect to such mortgage loans, such release to be effective automatically without any further action by any party upon payment from Participant to Seller of an amount equal to the Initial Purchase Price, in accordance with the Wire Instructions in effect on the date of such payment.

That, pursuant to the terms of Section 3(d) of the Amended and Restated Custodial Agreement, dated January 31, 2003 (the “Custodial Agreement”), among UBS Warburg Real Estate Securities Inc. (the “Company”), Crescent Mortgage Services, Inc., and JPMorgan Chase Bank, the Company, hereby appoints [Title] of JPMorgan Chase Bank, as its attorney-in-fact in its name and on its behalf, with full power of substitution and revocation, to do, execute and perform all or any of the acts, deeds, matters and things hereinafter referred to:

1. To execute (under hand or personal seal) on behalf of the Company Form HUD 11711A (Release of Security Interest), Fannie Mae Form 2004 (Security Release Certification), FHLMC Form 939 (Security Settlement Information and Delivery Authorization) and FHLMC Form 996 (Warehouse Lender Release of Security Interest) all in accordance with the terms of Section 3(d) of the Custodial Agreement.

2. To appoint (whether under hand or seal) one or more substitute or substitutes as Attorney or Attorneys for all or any of the purposes aforesaid and to revoke the appointment of the same at will.

This Power of Attorney shall be effective from the date hereof and cease to be effective when revoked in writing by the Company.

UBS WARBURG REAL ESTATE SECURITIES INC.

By:
Name: Title:

Capitalized terms used herein and not defined herein shall have the meanings ascribed to such terms in the above-referenced Amended and Restated Custodial Agreement.

Set forth below are the Wire Instructions applicable to the above-referenced Amended and Restated Custodial Agreement.

Please acknowledge receipt of this letter in the space provided below. This letter supersedes and replaces any prior notice specifying the name of the Warehouse Lender and the Wire Instructions and shall remain in effect until superseded and replaced by a letter, in the form of this letter, executed by each of us and acknowledged by you.


Very truly yours, CRESCENT MORTGAGE SERVICES, INC.

By:
		[Title] [Warehouse Lender(s)]¹

By:

[Title]

[Custodian]


By:
		[Title]

In accordance with the Amended and Restated Custodial Agreement dated January 31, 2003 among UBS Warburg Real Estate Securities Inc. (the “Participant”), Crescent Mortgage Services, Inc. and JPMorgan Chase Bank (the “Custodian”), we hereby confirm that payment has been made by the Participant in accordance with the Exhibit B-1 letter previously delivered to you.

SIGNED
CRESCENT MORTGAGE SERVICES, INC.


Authorized Officer

PARTICIPANT:		UBS WARBURG REAL ESTATE SECURITIES INC.

ADDRESS:		1285 AVENUE OF THE AMERICAS NEW YORK, NEW YORK 10019 ATTENTION: GEORGE A. MANGIARACINA TELEPHONE: (212) 713-3734 ATTENTION: ROBERT CARPENTER
		TELEPHONE: (212) 713-8749

CUSTODIAN:		JPMORGAN CHASE BANK

ADDRESS:		450 WEST 33^RD STREET (15^TH FLOOR) NEW YORK, NEW YORK 10001

SELLER:		CRESCENT MORTGAGE SERVICES, INC.

ADDRESS:		115 PERIMETER CENTER PLACE SUITE 285 ATLANTA, GEORGIA 30346 ATTENTION: MIKE LEDDY

DATE:		JANUARY 31, 2003

		Page

SECTION 1.	DEFINITIONS.	2

SECTION 2.	DELIVERY OF DOCUMENTS	7

SECTION 3.	CUSTODIAN AS CUSTODIAN FOR, AND BAILEE OF, PARTICIPANT AND ASSIGNEES	9

SECTION 4.	CERTIFICATION OF RECEIPT BY CUSTODIAN	10

SECTION 5.	CUSTODIAN’S FEES AND EXPENSES; SUCCESSOR CUSTODIAN	12

SECTION 6.	DEFAULT	14

SECTION 7.	ACCESS TO DOCUMENTS	14

SECTION 8.	ASSIGNMENT BY PARTICIPANT	14

SECTION 9.	INSURANCE	15

SECTION 10.	REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE CUSTODIAN	15

SECTION 11.	INDEMNIFICATION BY CUSTODIAN	16

SECTION 12.	NO ADVERSE INTERESTS	16


SECTION 13.	AMENDMENTS	16

SECTION 14.	RECORDATION OF AGREEMENT	16

SECTION 15.	EXECUTION IN COUNTERPARTS	16

SECTION 16.	AGREEMENT FOR EXCLUSIVE BENEFIT OF PARTIES; ASSIGNMENT	16

SECTION 17.	EFFECT OF INVALIDITY OF PROVISIONS	17

SECTION 18.	GOVERNING LAW	17

SECTION 19.	CONSENT TO SERVICE	17

SECTION 20.	SUBMISSION TO JURISDICTION	17

SECTION 21.	JURISDICTION NOT EXCLUSIVE	17

SECTION 22.	WAIVER OF JURY TRIAL	17

SECTION 23.	NOTICES	17

SECTION 24.	AUTHENTICATION	17

SECTION 25.	CONSTRUCTION	18

SECTION 26.	EFFECT OF AMENDMENT AND RESTATEMENT	18

Exhibit A	Participation Certificate

*	A =	weighted average Trade Price
	B =	principal amount of the Mortgage Loans backing the Security
	C =	1 minus the Discount

(1)		Form HUD 11700 (Letter of Transmittal), if applicable;

(2)		Form HUD 11702 providing updated information with respect to key officers and employees, if applicable;

(3)		Form HUD 11705 (Schedule of Subscribers) completed with UBS Warburg Real Estate Securities Inc. as the only subscriber and with UBS Warburg Real Estate Securities Inc. or its designee as the only person authorized to take delivery of such GNMA Security;

(4)		Form HUD 11706 (Schedule of Pooled Mortgages), to be notarized and executed by the Custodian and a copy of the reverse side of form 11706 (Initial Certification);

(5)		Form HUD 11707 (Servicing Agreement);

(6)		Form HUD 11709 (Letter Agreement establishing Servicer’s Principal and Interest Custodial Account);

(7)		Form HUD 11711A (Release of Security Interest);¹

(8)		Form HUD 11711B (Certification and Agreement);

(9)		Form HUD 11715 (Custodial Agreement);

(10)		Form HUD 11716 (Summary of Guaranty Agreement) referencing the terms and conditions of GNMA’s guaranty;

(11)		Form HUD 11717 (Prospectus) for the Mortgage Loans included in form HUD 11706;

(12)		Form HUD 11720 (Letter Agreement for Servicer’s Escrow Custodial Account);

(13)		Updated information regarding fidelity insurance coverage and the financial and business condition of the Seller, if applicable; and

(14)		A copy of the Seller’s latest annual financial statement audited and certified (unless already submitted to GNMA).


Exhibit B-1		Warehouse Lender’s Release

Exhibit B-2		Seller’s Release

Exhibit C-1		GNMA Document List

Exhibit C-2		FNMA Document List

Exhibit C-3		FHLMC Document List

Exhibit D		Limited Power of Attorney

Exhibit E		Wire Instructions

Exhibit F		Confirmation of Payment

Exhibit G		Form of Electronic Tracking Agreement

[ ]	(a)	Form HUD 11706 (Schedule of Pooled Mortgages);

[ ]	(b)	Fannie Mae Form 2005 (Schedule of Mortgages); or

[ ]	(c)	FHLMC Form 11 (Mortgage Submission Schedule) or MIDANET computer tape;


(i)		Fannie Mae Form 2003 (Custodial Agreement);

(ii)		Fannie Mae Form 2004 (Security Release Certification) (executed by Participant and Seller);¹

(iii)		Fannie Mae Form 2005 (Schedule of Mortgages with Magnetic Tape Format Instructions) appropriately certified;

(iv)		Fannie Mae Form 2007 (Letter Agreement for Lender’s Principal and Interest Custodial Account); and, if Seller uses or plans to use a subservicer, Fannie Mae Form 2007A (Letter Agreement for Subservicer’s Principal Custodial Account);

(v)		Fannie Mae Form 2008 (Letter Agreement for Lender’s Taxes and Insurance Custodial Account) and, if Seller uses or plans to use a subservicer, Fannie Mae Form 2008A (Letter Agreement for Subservicer’s Taxes and Insurance Custodial Account); and

(vi)		Fannie Mae Form 2014 (Delivery Schedule) (listing Participant as the sole owner of the FNMA Security and the only person authorized to take delivery of such FNMA Security).


(i)		FHLMC Form 1035 (Custodial Agreement);

(ii)		FHLMC Form 381 (Contract Delivery Summary) and FHLMC Form 939 (Settlement and Information Multiple Registration Form) designating Participant as the party authorized to receive the Securities, executed by Seller and relating to the Securities to be backed by the Mortgage Loans, certified by Seller to be correct and unmodified copies of such forms in full force and effect;

(iii)		FHLMC Form 1034 (Custodial Certification Schedule);

(iv)		FHLMC Form 11 (Mortgage Submission Schedule), FHLMC Form 13SF (Mortgage Submission Voucher) or MIDANET computer tape;

(v)		FHLMC Form 3 (Summary Agreement);

(vi)		FHLMC Form 58 (Participation Certificate Home Mortgage Participation Program);

(vii)		FHLMC Form 1 (Fixed-Rate Mortgage Purchase Contract Conventional Home Mortgages);

(viii)		FHLMC Form 996 (Warehouse Lender Release of Security Interest);¹ and

(ix)		The original Mortgage Notes related to the Mortgage Loans identified in FHLMC Form 1034 (Custodial Certification Schedule) each endorsed, “Pay to the order of , without recourse” and signed in the name of the Seller by an authorized officer.²