Document:

<PAGE>
                                                                   EXHIBIT 10.14

                                                                       EXECUTION

                          THORNBURG MORTGAGE SECURITIES
                            TRUST 2003-6, as Issuer,

                      THORNBURG MORTGAGE HOME LOANS, INC.,
                                   as Seller,

                    STRUCTURED ASSET SECURITIES CORPORATION,
                                  as Depositor,

                           WELLS FARGO BANK MINNESOTA,
                    NATIONAL ASSOCIATION, as Master Servicer,

                                       and

                      DEUTSCHE BANK NATIONAL TRUST COMPANY,
                              as Indenture Trustee

                           ---------------------------

                          SALE AND SERVICING AGREEMENT

                          Dated as of December 1, 2003
                           ---------------------------

                   THORNBURG MORTGAGE SECURITIES TRUST 2003-6
                             MORTGAGE-BACKED NOTES,
                                  SERIES 2003-6

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                                TABLE OF CONTENTS

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ARTICLE I DEFINITIONS......................................................................1

Section 1.01.     Definitions...............................................................1
Section 1.02.     Calculations Respecting Mortgage Loans...................................28
Section 1.03.     Calculations Respecting Accrued Interest.................................29

ARTICLE II CONVEYANCE OF MORTGAGE LOANS....................................................29

Section 2.01.     Conveyance of Mortgage Loans.............................................29
Section 2.02.     Acceptance of Trust Estate; Review of Documentation......................33
Section 2.03.     Grant Clause.............................................................34

ARTICLE III REPRESENTATIONS AND WARRANTIES.................................................35

Section 3.01.     Representations and Warranties of the Depositor..........................35
Section 3.02.     Representations and Warranties of the Master Servicer....................37
Section 3.03.     Repurchase or Substitution of Mortgage Loans by Seller...................39
Section 3.04.     Representations and Warranties of the Seller with Respect to
                  the Mortgage Loans.......................................................42
Section 3.05.     Representations and Warranties of the Seller.............................43
Section 3.06.     Covenants of the Seller..................................................44

ARTICLE IV ADMINISTRATION AND SERVICING OF MORTGAGE LOANS BY THE MASTER SERVICER...........45

Section 4.01.     Master Servicer to Service and Administer the Mortgage Loans.............45
Section 4.02.     Monitoring of Servicers..................................................46
Section 4.03.     Fidelity Bond............................................................47
Section 4.04.     Power to Act; Procedures.................................................47
Section 4.05.     Due-on-Sale Clauses; Assumption Agreement................................48
Section 4.06      Release of Mortgage Files................................................49
Section 4.07.     Documents, Records and Funds in Possession of Master Servicer
                  To Be Held for Indenture Trustee.........................................50
Section 4.08.     Standard Hazard Insurance and Flood Insurance Policies...................50
Section 4.09.     Maintenance of the Primary Insurance Policies............................51
Section 4.10.     Indenture Trustee to Retain Possession of Certain Insurance
                  Policies and Documents...................................................51
Section 4.11.     Realization Upon Defaulted Mortgage Loans................................52
Section 4.12.     Compensation to the Master Servicer......................................52
Section 4.13.     REO Property.............................................................52
Section 4.14.     Annual Officer's Certificate as to Compliance............................53
Section 4.15.     Annual Independent Accountant's Servicing Report.........................53
Section 4.16.     Reports Filed with Securities and Exchange Commission....................54
Section 4.17.     Amendments to Master Servicing Guide and Correspondent Sellers Guide.....55
</TABLE>

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Section 4.18.     Optional or Required Purchase of Certain Mortgage Loans..................55
Section 4.19.     Closing Certificate and Opinion..........................................56
Section 4.20.     Liabilities of the Master Servicer.......................................56
Section 4.21.     Merger or Consolidation of the Master Servicer...........................56
Section 4.22.     Indemnification of the Indemnified Persons...............................57
Section 4.23.     Limitations on Liability of the Master Servicer and Others...............57
Section 4.24.     Master Servicer Not to Resign............................................59
Section 4.25.     Successor Master Servicer................................................59
Section 4.26.     Sale and Assignment of Master Servicing..................................59
Section 4.27.     Determination of LIBOR...................................................60
Section 4.28.     Realization upon Troubled Mortgage Loans.................................60

ARTICLE V DEPOSITS AND PAYMENTS TO HOLDERS................................................60

Section 5.01.     Servicing Accounts.......................................................60
Section 5.02.     Collection Account.......................................................62
Section 5.03.     Permitted Withdrawals and Transfers from the Collection Account..........63
Section 5.04.     The Note Account.........................................................65
Section 5.05.     Yield Maintenance Account................................................66
Section 5.06.     Payments from the Note Account...........................................67
Section 5.07.     Allocation of Losses.....................................................69
Section 5.08.     The Certificate Account..................................................69
Section 5.09.     Control of the Trust Accounts............................................69
Section 5.10.     Statements...............................................................73
Section 5.11.     Advances.................................................................76
Section 5.12.     Compensating Interest Payments...........................................76
Section 5.13.     Termination Receipts.....................................................76

ARTICLE VI MASTER SERVICER EVENTS OF DEFAULT...............................................77

Section 6.01.     Master Servicer Events of Default; Indenture Trustee To Act;
                  Appointment of Successor.................................................77
Section 6.02.     Indenture Trustee to Act.................................................79
Section 6.03.     Waiver of Master Servicer Event of Default...............................80
Section 6.04.     Notification to Holders..................................................81

ARTICLE VII TERMINATION....................................................................81

Section 7.01.     Termination..............................................................81
Section 7.02.     Optional Note Purchase Right.............................................82
Section 7.03.     Optional Termination.....................................................82
Section 7.04.     Procedure Upon Termination...............................................82

ARTICLE VIII MISCELLANEOUS PROVISIONS......................................................83

Section 8.01.     Binding Nature of Agreement; Assignment..................................83
Section 8.02.     Entire Agreement.........................................................83
</TABLE>

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Section 8.03.     Amendment................................................................83
Section 8.04.     Acts of Securityholders..................................................84
Section 8.05.     Recordation of Agreement.................................................84
Section 8.06.     Governing Law............................................................85
Section 8.07.     Notices..................................................................85
Section 8.08.     Severability of Provisions...............................................85
Section 8.09.      Indulgences; No Waivers.................................................86
Section 8.10.     Headings Not To Affect Interpretation....................................86
Section 8.11.     Benefits of Agreement....................................................86
Section 8.12.     Special Notices to the Rating Agencies...................................86
Section 8.13.     Counterparts.............................................................87
Section 8.14.     Execution by the Issuer..................................................87
</TABLE>

ATTACHMENTS

Exhibit A-1        Form of Receipt of Mortgage Note
Exhibit A-2        Form of Interim Certification of Indenture Trustee
Exhibit A-3        Form of Final Certification of Indenture Trustee
Exhibit B          Request for Release of Documents and Receipt
Exhibit C          List of Servicing Agreements
Exhibit D          List of Servicers
Exhibit E          Form of Lost Note Affidavit

Schedule A         Mortgage Loan Schedule
Schedule B         Converted Mortgage Loan Schedule
Schedule C         Modified Mortgage Loan Schedule
Schedule D         Three-Year Hybrid Mortgage Loan Schedule
Schedule E         Five-Year Hybrid Mortgage Loan Schedule
Schedule F         Seven-Year Hybrid Mortgage Loan Schedule
Schedule G         Ten-Year Hybrid Mortgage Loan Schedule

                                      iii
<PAGE>
         This SALE AND SERVICING AGREEMENT, dated as of December 1, 2003 (the
"Agreement" or the "Sale and Servicing Agreement"), is by and among THORNBURG
MORTGAGE SECURITIES TRUST 2003-6, a Delaware business trust, as issuer (the
"Issuer"), THORNBURG MORTGAGE HOME LOANS, INC., a Delaware corporation, as
seller (the "Seller"), STRUCTURED ASSET SECURITIES CORPORATION, a Delaware
corporation, as depositor (the "Depositor"), DEUTSCHE BANK NATIONAL TRUST
COMPANY, as Indenture Trustee (the "Indenture Trustee") and WELLS FARGO BANK
MINNESOTA, NATIONAL ASSOCIATION, as master servicer (the "Master Servicer").

                              PRELIMINARY STATEMENT

         WHEREAS, the Depositor has acquired the Mortgage Loans from Thornburg
Mortgage Home Loans, Inc. (the "Seller") pursuant to the Mortgage Loan Purchase
Agreement, and at the Closing Date is the owner of the Mortgage Loans and the
other property being conveyed by it to the Issuer hereunder for inclusion in the
Trust Estate;

         WHEREAS, on the Closing Date, the Depositor will acquire the Notes and
the Trust Certificate from the Issuer, as consideration for its transfer to the
Issuer of the Mortgage Loans and the other property constituting the Trust
Estate;

         WHEREAS, the Depositor has duly authorized the execution and delivery
of this Agreement to provide for the conveyance to the Issuer of the Mortgage
Loans and the other property constituting the Trust Estate and the servicing of
the Mortgage Loans;

         WHEREAS, pursuant to the Indenture, the Issuer will pledge the Mortgage
Loans, the Yield Maintenance Agreements and the other property constituting the
Trust Estate to the Indenture Trustee as security for the Notes;

         NOW, THEREFORE, in consideration of the mutual agreements herein
contained, the Issuer, the Depositor, the Seller, the Master Servicer and the
Indenture Trustee agree as follows:

                                   ARTICLE I

                                   DEFINITIONS

         Section 1.01 Definitions. The following words and phrases, unless the
context otherwise requires, shall have the following meanings:

         Accepted Servicing Practices: With respect to any Mortgage Loan, as
applicable, either (x) those customary mortgage servicing practices of prudent
mortgage servicing institutions that master service mortgage loans of the same
type and quality as such Mortgage Loan in the jurisdiction where the related
Mortgaged Property is located, to the extent applicable to the Indenture Trustee
or the Master Servicer (except in its capacity as successor to a Servicer), or
(y) as provided in the applicable Servicing Agreement, to the extent applicable
to any Servicer, but in no event below the standard set forth in clause (x).

                                       1
<PAGE>

         Accountant: A person engaged in the practice of accounting who (except
when this Agreement provides that an Accountant must be Independent) may be
employed by or affiliated with the Depositor or an Affiliate of the Depositor.

         Accrual Period: With respect to any Payment Date and any Class of
Notes, the period beginning on the Payment Date in the calendar month
immediately preceding the month in which the related Payment Date occurs (or, in
the case of the first Payment Date, beginning on December 22, 2003) and ending
on the day immediately preceding the related Payment Date.

         Additional Collateral: With respect to any Additional Collateral
Mortgage Loan, the marketable securities subject to a security interest pursuant
to the related pledge agreement.

         Additional Collateral Mortgage Loan: Each Mortgage Loan identified as
such in the Mortgage Loan Schedule and as to which Additional Collateral is then
required to be provided as security therefor.

         Additional Yield Maintenance Payment: For each Swap Agreement and any
Payment Date, any termination payments (excluding any Net Yield Maintenance
Payments) then payable by the Issuer to the Yield Maintenance Counterparty as a
result of an early termination of the related Swap Agreement.

         Adjustment Date: With respect to each Mortgage Loan, each adjustment
date on which the related Mortgage Rate changes pursuant to the related Mortgage
Note. The first Adjustment Date following the Cut-Off Date as to each Mortgage
Loan is set forth in the Mortgage Loan Schedule.

         Administration Agreement: The Administration Agreement dated as of
December 1, 2003 among the Issuer, the Administrator and the Depositor, as such
may be amended or supplemented from time to time.

         Administrator: Deutsche Bank National Trust Company, or any successor
in interest thereto, in its capacity as Administrator under the Administration
Agreement.

         Advance: As to any Mortgage Loan or REO Property, any advance made by
the Master Servicer in respect of any Payment Date pursuant to Section 5.11.

         Affiliate: With respect to any specified Person, any other Person
controlling or controlled by or under common control with such specified Person.
For the purposes of this definition, "control" when used with respect to any
specified Person means the power to direct the management and policies of such
Person, directly or indirectly, whether through the ownership of voting
securities, by contract or otherwise; and the terms "controlling" and
"controlled" have meanings correlative to the foregoing.

         Agreement: This Sale and Servicing Agreement and all amendments and
supplements hereto.

                                       2
<PAGE>
         Applied Loss Amount: With respect to any Payment Date and any Class of
Notes (other than the Class A-1 Notes), the excess of (x) the aggregate Note
Principal Amount of such Notes after giving effect to distributions of principal
on such Notes on such Payment Date, but before giving effect to any application
of the Applied Loss Amount with respect to such date, over (y) the Pool Balance
for such Payment Date as reduced by all Realized Losses incurred with respect to
the Mortgage Loans during the related Due Period.

         Assignment: As to any Mortgage, an assignment of mortgage, notice of
transfer or equivalent instrument, in recordable form, which is sufficient,
under the laws of the jurisdiction in which the related Mortgaged Property is
located, to reflect or record the sale of such Mortgage.

         Bankruptcy: As to any Person, the making of an assignment for the
benefit of creditors, the filing of a voluntary petition in bankruptcy,
adjudication as a bankrupt or insolvent, the entry of an order for relief in a
bankruptcy or insolvency proceeding, the seeking of reorganization, arrangement,
composition, readjustment, liquidation, dissolution or similar relief, or
seeking, consenting to or acquiescing in the appointment of a trustee, receiver
or liquidator, dissolution, or termination, as the case may be, of such Person
pursuant to the provisions of either the United States Bankruptcy Code of 1986,
as amended, or any other similar state laws.

         Bankruptcy Code: The United States Bankruptcy Code of 1986, as amended.

         Base Value: With respect to any Mortgage Loan for which Additional
Collateral has been pledged, the value of the Additional Collateral as
determined with respect to that Mortgage Loan in accordance with the applicable
underwriting guidelines.

         Basis Risk Shortfall: With respect to any Payment Date and any Class of
Notes, the amount by which the amount of interest calculated at the Note
Interest Rate applicable to such Class for such date, determined without regard
to the Net Funds Cap for such date but subject to a cap equal to 11.50% exceeds
the amount of interest calculated at the Net Funds Cap.

         Book-Entry Notes:  As defined in the Indenture.

         Business Day: Any day other than (i) a Saturday or a Sunday, (ii) a day
on which banking institutions in California, Minnesota, Maryland, New York,
Delaware or the city in which the Corporate Trust Office of the Indenture
Trustee is located are authorized or obligated by law or executive order to be
closed.

         Cap Agreement: Each of the three interest rate cap agreements dated
December 22, 2003, by and between the Yield Maintenance Counterparty and the
Issuer, including the ISDA Master Agreement dated as of December 22, 2003
between the Yield Maintenance Counterparty and the Issuer, the schedule thereto
and the related confirmations (Ref. Nos., 433553, 433556 and 433560).

         Carryforward Interest: With respect to any Payment Date and each Class
of Notes, the sum of (i) the excess of (x) the sum of (A) Current Interest for
such Class for the immediately preceding Payment Date and (B) any unpaid
Carryforward Interest for such Class from previous

                                       3
<PAGE>

Payment Dates over (y) the amount distributed in respect of interest on such
Class on such immediately preceding Payment Date and (ii) interest on such
amount for the related Accrual Period at the applicable Note Interest Rate.

         Cendant: Cendant Mortgage Corporation, and its successors and assigns.

         Certificate Account: The account maintained by the Administrator
pursuant to Section 5.08.

         Certificateholder: As defined in the Trust Agreement.

         Class:  All Notes bearing the same class designation.

         Class Principal Amount: With respect to each Class of Notes, the
aggregate of the Note Principal Amounts of all Notes of such Class at the date
of determination.

         Closing Date:  December 22, 2003.

         Code: The Internal Revenue Code of 1986, as amended, and as it may be
further amended from time to time, any successor statutes thereto, and
applicable U.S. Department of Treasury regulations issued pursuant thereto in
temporary or final form.

         Collection Account: A separate account established and maintained by
the Master Servicer pursuant to Section 5.02, which shall be entitled "Wells
Fargo Bank Minnesota, National Association, as Master Servicer for Deutsche Bank
National Trust Company, as Indenture Trustee, in trust for the registered
Holders of Thornburg Mortgage Securities Trust 2003-6, Mortgage-Backed
Securities, Series 2003-6" and which must be an Eligible Account.

         Compensating Interest Payment: With respect to any Payment Date, an
amount equal to the amount, if any, by which (x) the aggregate amount of any
Prepayment Interest Shortfalls with respect to such Payment Date exceeds (y) the
aggregate amount actually paid by the Servicers in respect of such shortfalls;
provided, that such amount, to the extent payable by the Master Servicer, shall
not exceed the aggregate Master Servicing Fee that would be payable to the
Master Servicer in respect of such Payment Date without giving effect to any
Compensating Interest Payment.

         Control:  The meaning specified in Section 8-106 of the New York UCC.

         Converted Loan: Any Convertible Mortgage Loan as to which the Mortgagor
thereunder has exercised its right under the related Mortgage Note to convert
the adjustable Mortgage Rate thereon to a fixed Mortgage Rate.

         Converted Mortgage Loan Schedule: With respect to each Payment Date, a
schedule listing each Convertible Mortgage Loan that has become a Converted
Mortgage Loan during the immediately preceding Due Period, and the Purchase
Price for each such Converted Mortgage Loan in the form attached hereto as
Schedule B.

                                       4
<PAGE>
         Convertible Mortgage Loan: Any Mortgage Loan which, at the option of
the Mortgagor and in accordance with the terms of the related Mortgage Note, may
have the related Mortgage Rate converted from an adjustable rate to a fixed
rate.

         Cooperative Corporation: The entity that holds title (fee or an
acceptable leasehold estate) to the real property and improvements constituting
the Cooperative Property and which governs the Cooperative Property, which
Cooperative Corporation must qualify as a Cooperative Housing Corporation under
Section 216 of the Code.

         Cooperative Loan: Any Mortgage Loan secured by Cooperative Shares and a
Proprietary Lease.

         Cooperative Loan Documents: As to any Cooperative Loan, (i) the
Cooperative Shares, together with a stock power in blank; (ii) the original
executed Security Agreement and the assignment of the Security Agreement
endorsed in blank; (iii) the original executed Proprietary Lease and the
assignment of the Proprietary Lease endorsed in blank; (iv) the original
executed Recognition Agreement and the assignment of the Recognition Agreement
(or a blanket assignment of all Recognition Agreements) endorsed in blank; (v)
the executed UCC-1 financing statement with evidence of recording thereon, which
has been filed in all places required to perfect the security interest in the
Cooperative Shares and the Proprietary Lease; and (vi) executed UCC-3 financing
statements (or copies thereof) or other appropriate UCC financing statements
required by state law, evidencing a complete and unbroken line from the
mortgagee to the Indenture Trustee with evidence of recording thereon (or in a
form suitable for recordation).

         Cooperative Property: The real property and improvements owned by the
Cooperative Corporation, that includes the allocation of individual dwelling
units to the holders of the Cooperative Shares of the Cooperative Corporation.

         Cooperative Shares:  Shares issued by a Cooperative Corporation.

         Cooperative Unit: A single-family dwelling located in a Cooperative
Property.

         Corporate Trust Office: The principal corporate trust office of the
Indenture Trustee at which, at any particular time, its corporate trust business
shall be administered, which office at the date hereof is located at 1761 East
St. Andrew Place, Santa Ana, California 92705, Attention: Thornburg 2003-6
(TM0306).

         Correspondent Sellers Guide: The Seller's Correspondent Sellers Guide,
revised January 2003 and as revised from time to time.

         Current Interest: With respect to each Class of Notes and any Payment
Date, the aggregate amount of interest accrued at the applicable Note Interest
Rate during the related Accrual Period on the Class Principal Amount of such
Class immediately prior to such Payment Date.

         Custodian: Deutsche Bank National Trust Company, and its successors
acting as custodian of the Mortgage Files on behalf of the Indenture Trustee.

                                       5
<PAGE>

         Cut-off Date: With respect to any Mortgage Loan other than a Qualified
Substitute Mortgage Loan, the close of business in New York City on December 1,
2003. With respect to any Qualified Substitute Mortgage Loan, the date
designated as such on the Mortgage Loan Schedule (as amended).

         Cut-off Date Balance: With respect to the Mortgage Loans, the Pool
Balance as of the Cut-off Date.

         Debt Service Reduction: With respect to any Mortgage Loan, a reduction
in the Monthly Payment for that Mortgage Loan by a court of competent
jurisdiction in a proceeding under the Bankruptcy Code, unless the reduction
results from a Deficient Valuation.

         Deferred Amount: With respect to any Payment Date and the Class of
Subordinate Notes and the Class A-2 Notes, an amount equal to the amount by
which (x) the aggregate of Applied Loss Amounts previously applied in reduction
of the Note Principal Amount thereof exceeds (y) the aggregate of amounts
previously paid in reimbursement thereof.

         Deficient Valuation: With respect to any Mortgage Loan, a valuation of
the related Mortgaged Property by a court of competent jurisdiction in an amount
less than the then outstanding principal balance of the Mortgage Loan, which
valuation results from a proceeding initiated under the Bankruptcy Code.

         Deleted Mortgage Loan: A Mortgage Loan that is repurchased from the
Trust Estate pursuant to the terms hereof or for which one or more Qualified
Substitute Mortgage Loans are substituted.

         Depositor: Structured Asset Securities Corporation, a Delaware
corporation having its principal place of business in New York, or its
successors in interest.

         Determination Date: For any Payment Date and each Mortgage Loan, the
date each month, as set forth in the related Servicing Agreement, on which the
related Servicer determines the amount of all funds that are required to be
remitted to the Master Servicer on the Servicer Remittance Date with respect to
the Mortgage Loans it is servicing.

         Due Date: With respect to each Mortgage Loan and any Payment Date, the
first day of the calendar month in which that Payment Date occurs on which the
Monthly Payment for such Mortgage Loan was due, exclusive of any days of grace.

         Due Period: With respect to any Payment Date and Mortgage Loan, the
period commencing on the second day of the month immediately preceding the month
in which such Payment Date occurs and ending on the first day of the month in
which such Payment Date occurs.

         Eligible Account:  Any of

                  (i) an account or accounts maintained with a federal or state
         chartered depository institution or trust company the short-term
         unsecured debt obligations of

                                       6
<PAGE>

         which (or, in the case of a depository institution or trust company
         that is the principal subsidiary of a holding company, the short-term
         unsecured debt obligations of such holding company) are rated in the
         highest short term rating category of each Rating Agency at the time
         any amounts are held on deposit therein;

                  (ii) an account or accounts the deposits in which are fully
         insured by the FDIC (to the limits established by it), the uninsured
         deposits in which account are otherwise secured such that, as evidenced
         by an Opinion of Counsel delivered to the Indenture Trustee and to each
         Rating Agency, the Securityholders will have a claim with respect to
         the funds in the account or a perfected first priority security
         interest against the collateral (which shall be limited to Permitted
         Investments) securing those funds that is superior to claims of any
         other depositors or creditors of the depository institution with which
         such account is maintained;

                  (iii) a trust account or accounts maintained with the trust
         department of a federal or state chartered depository institution,
         national banking association or trust company acting in its fiduciary
         capacity; or

                  (iv) an account otherwise acceptable to each Rating Agency
         without reduction or withdrawal of its then current ratings of the
         Notes as evidenced by a letter from each Rating Agency to the Indenture
         Trustee. Eligible Accounts may bear interest.

         Employee Loan: Any Mortgage Loan identified as such in the Mortgage
Loan Schedule and which was originated by the Seller, which provides for an
increase in the Mortgage Rate thereof in the event of the change of employment
of the Mortgagor thereunder.

         Entitlement Holder: The meaning specified in Section 8-102(a)(7) of the
New York UCC.

         Entitlement Order: The meaning specified in Section 8-102(a)(8) of the
New York UCC (i.e., generally, orders directing the transfer or redemption of
any Financial Asset).

         ERISA: The Employee Retirement Income Security Act of 1974, as amended.

         Escrow Account: Any account with respect to tax and insurance escrow
payments established and maintained by each Servicer pursuant to the related
Servicing Agreement.

         Expense Fee: With respect to any Mortgage Loan, the sum of (i) the
Retained Interest, if any, (ii) the Master Servicing Fee, (iii) the related
Servicing Fee with respect to the related Servicer and (iv) the Indenture
Trustee Fee for such Mortgage Loan.

         Expense Fee Rate: With respect to any Mortgage Loan, the per annum rate
at which the Expense Fee accrues for such Mortgage Loan as set forth in the
Mortgage Loan Schedule.

         Extra Principal Payment Amount: With respect to any Payment Date, the
lesser of (a) Monthly Excess Cashflow for such Payment Date and (b) the
Overcollateralization Deficiency for such Payment Date.

                                       7
<PAGE>

         Fannie Mae: Federal National Mortgage Association, a federally
chartered and privately owned corporation organized and existing under the
Federal National Mortgage Association Charter Act, or any successor thereto.

         FDIC: The Federal Deposit Insurance Corporation or any successor
thereto.

         Financial Asset: The meaning specified in Section 8-102(a) of the New
York UCC.

         Five-Year Hybrid Mortgage Loans: The Mortgage Loans set forth on
Schedule E hereto.

         Freddie Mac: The Federal Home Loan Mortgage Corporation, a corporate
instrumentality of the United States created and existing under Title III of the
Emergency Home Finance Act of 1970, as amended, or any successor thereto.

         GNMA: The Government National Mortgage Association, a wholly owned
corporate instrumentality of the United States within HUD.

         Gross Margin: With respect to each Mortgage Loan, the fixed percentage
set forth in the related Mortgage Note that is added to the applicable Index on
each Adjustment Date in accordance with the terms of the related Mortgage Note
used to determine the Mortgage Rate for such Mortgage Loan.

         Guaranty Surety Bond: The Limited Purpose Surety Bond issued by the
Surety with respect to the Additional Collateral Mortgage Loans acquired by the
Seller from Cendant (No. AB0039BE).

         Holder or Securityholder: The registered holder of any Note or Trust
Certificate as recorded on the books of the Note Registrar or the Certificate
Registrar except that, solely for the purposes of taking any action or giving
any consent pursuant to this Agreement, any Note or Trust Certificate registered
in the name of the Depositor, the Indenture Trustee or any Affiliate thereof
shall be deemed not to be outstanding in determining whether the requisite
percentage necessary to effect any such consent has been obtained, except that,
in determining whether the Indenture Trustee shall be protected in relying upon
any such consent, only Notes and Trust Certificates which a Responsible Officer
of the Indenture Trustee has actual knowledge to be so held shall be
disregarded. The Indenture Trustee may request and conclusively rely on
certifications by the Depositor in determining whether any Notes or Trust
Certificates are registered to an Affiliate of the Depositor.

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

         Indemnified Persons: The Indenture Trustee, the Administrator, the
Seller, the Owner Trustee, the Master Servicer and the Depositor and their
officers, directors, agents and employees and, with respect to the Indenture
Trustee, any separate co-trustee and its officers, directors, agents and
employees.

                                       8
<PAGE>

         Indenture: The Indenture dated as of December 1, 2003, between the
Issuer and the Indenture Trustee, as such may be amended or supplemented from
time to time.

         Indenture Trustee: Deutsche Bank National Trust Company, not in its
individual capacity but solely as Indenture Trustee, or any successor in
interest which accepts its appointment as Indenture Trustee hereunder and agrees
to act in such capacity in accordance herewith.

         Indenture Trustee Fee:  As defined in the Indenture.

         Indenture Trustee Fee Rate:  0.00065% per annum.

         Independent: When used with respect to any Accountant and a specified
Person, an Accountant who is "independent" within the meaning of Rule 2-01(b) of
the Securities and Exchange Commission's Regulation S-X. When used with respect
to any Person other than an Accountant and a specified Person, a Person who (a)
is in fact independent of such specified Person and any Affiliate of such
specified Person, (b) does not have any material direct financial interest in
such specified Person or any Affiliate of such specified Person, and (c) is not
connected with such specified Person or any Affiliate of such specified Person
as an officer, employee, promoter, underwriter, trustee, partner, director or
Person performing similar functions, provided, however, that a Person shall not
fail to be Independent of such specified Person or any Affiliate thereof merely
because such Person is the beneficial owner of 1% or less of any class of
securities issued by such specified Person or any Affiliate thereof.

         Index: With respect to each Mortgage Loan and each Adjustment Date, the
index specified in the related Mortgage Note.

         Initial LIBOR Rate:  1.14875%.

         Initial Optional Notes Purchase Date: The first Payment Date on or
after which the aggregate Scheduled Principal Balance of the Mortgage Loans as
of the end of the immediately preceding Due Period is equal to or less than 20%
of the Cut-off Date Balance.

         Insurance Proceeds: With respect to any Mortgage Loan, proceeds of any
primary mortgage insurance, title policy, hazard policy or other insurance
policy covering a Mortgage Loan or related Mortgaged Property, to the extent
such proceeds are not to be applied to the restoration of the related Mortgaged
Property or released to the related Mortgagor in accordance with the related
Servicing Agreement or applied toward the payment of any Retained Interest.

         Interest Remittance Amount: With respect to any Payment Date and with
respect to all of the Mortgage Loans, (a) the sum of (1) all interest collected
(other than Payaheads) or advanced in respect of Monthly Payments on the
Mortgage Loans during the related Due Period by the Servicers or the Master
Servicer, minus (i) any Servicing Fee, the Master Servicing Fee and the
Indenture Trustee Fee with respect to such Mortgage Loans, (ii) any Retained
Interest and (iii) previously unreimbursed Advances due to the Servicers or the
Master Servicer to the extent allocable to interest and the allocable portion of
previously unreimbursed Servicing Advances with respect to the Mortgage Loans,
(2) any Compensating Interest Payments and any payments

                                       9
<PAGE>

made by Servicers with respect to Prepayment Interest Shortfalls with respect to
the related Prepayment Period with respect to the Mortgage Loans, (3) the
portion of any Purchase Price or Substitution Amount paid with respect to the
Mortgage Loans during the related Prepayment Period allocable to interest, (4)
the portion of any Termination Price allocable to interest received in
connection with an Optional Termination pursuant to Section 7.03, (5) the
interest portion of any amount paid under the Guaranty Surety Bond and (6) all
Net Liquidation Proceeds, Insurance Proceeds and any other recoveries collected
with respect to the Mortgage Loans during the related Prepayment Period, to the
extent allocable to interest, as reduced by (b) any Prepayment Penalty Amount
and other costs, expenses or liabilities reimbursable to the Indenture Trustee,
the Administrator, the Master Servicer, the Owner Trustee and each Servicer to
the extent provided in the Operative Agreements and each Servicing Agreement.

         LIBOR: With respect to the first Accrual Period, the Initial LIBOR
Rate. With respect to each subsequent Accrual Period, a per annum rate
determined on the LIBOR Determination Date in the following manner by the Master
Servicer on the basis of the "Interest Settlement Rate" set by the British
Bankers' Association (the "BBA") for one-month United States dollar deposits, as
such rates appear on the Telerate Page 3750, as of 11:00 a.m. (London time) on
such LIBOR Determination Date.

         (a) If on such a LIBOR Determination Date, the BBA's Interest
Settlement Rate does not appear on the Telerate Page 3750 as of 11:00 a.m.
(London time), or if the Telerate Page 3750 is not available on such date, the
Master Servicer will obtain such rate from Reuters' "page LIBOR 01" or
Bloomberg's page "BBAM". If such rate is not published for such LIBOR
Determination Date, LIBOR for such date will be the most recently published
Interest Settlement Rate. In the event that the BBA no longer sets an Interest
Settlement Rate, the Depositor will designate an alternative index that has
performed, or that the Depositor expects to perform, in a manner substantially
similar to the BBA's Interest Settlement Rate.

         (b) The establishment of LIBOR by the Master Servicer and the Master
Servicer's subsequent calculation of the Note Interest Rate applicable to the
Notes for the relevant Accrual Period, in the absence of manifest error, will be
final and binding.

         LIBOR Business Day: Any day on which banks in London, England and The
City of New York are open and conducting transactions in foreign currency and
exchange.

         LIBOR Determination Date: The second LIBOR Business Day immediately
preceding the commencement of each Accrual Period for any Notes.

         Liquidated Mortgage Loan: As to any Payment Date, any Mortgage Loan in
respect of which the related Servicer or the Master Servicer has determined, in
accordance with the servicing procedures specified herein, as of the end of the
related Prepayment Period, that all Liquidation Proceeds that it expects to
recover with respect to the liquidation of such Mortgage Loan or disposition of
the related REO Property have been recovered.

         Liquidation Expenses: With respect to a Mortgage Loan in liquidation,
unreimbursed expenses paid or incurred by or for the account of the Master
Servicer or the related Servicers, such expenses including (a) property
protection expenses, (b) property sales expenses, (c)

                                       10
<PAGE>

foreclosure and sale costs, including court costs and reasonable attorneys'
fees, and (d) similar expenses reasonably paid or incurred in connection with
liquidation.

         Liquidation Proceeds: With respect to any Mortgage Loan, the amount
(other than amounts received in respect of the rental of any REO Property prior
to REO Disposition) received by the related Servicer as proceeds from the
liquidation of such Mortgage Loan, as determined in accordance with the
applicable provisions of the related Servicing Agreement; provided that (i) with
respect to any Mortgage Loan or REO Property repurchased, substituted or sold
pursuant to or as contemplated hereunder, or pursuant to the applicable
provisions of the related Servicing Agreement, "Liquidation Proceeds" shall also
include amounts realized in connection with such repurchase, substitution or
sale and (ii) with respect to a defaulted Additional Collateral Mortgage Loan,
"Liquidation Proceeds" shall also include the amount realized on the related
Additional Collateral and pursuant to the related Guaranty Surety Bond with
respect to such Mortgage Loan.

         Loan-to-Collateral Value Ratio: With respect to each Mortgage Loan and
any date of determination, a fraction, expressed as a percentage, the numerator
of which is the principal balance of the Mortgage Loan at such date of
determination less the Base Value of any related Additional Collateral and the
denominator of which is the Value of the related Mortgaged Property.

         Loan-to-Value Ratio: With respect to each Mortgage Loan and any date of
determination, a fraction, expressed as a percentage, the numerator of which is
the principal balance of the Mortgage Loan at such date of determination and the
denominator of which is the Value of the related Mortgaged Property.

         Lost Note Affidavit: With respect to any Mortgage Loan as to which the
original Mortgage Note has been permanently lost or destroyed and has not been
replaced, an affidavit from the Seller certifying that the original Mortgage
Note has been lost, misplaced or destroyed (together with a copy of the related
Mortgage Note and indemnifying the Issuer against any loss, cost or liability
resulting from the failure to deliver the original Mortgage Note) in the form of
Exhibit E hereto.

         Majority Securityholders: Until such time as the sum of the Class
Principal Amounts of all Classes of Notes has been reduced to zero, the holder
or holders of in excess of 50% of the aggregate Class Principal Amount of all
Classes of Notes (accordingly, the holder of the Trust Certificate shall be
excluded from any rights or actions of the Majority Securityholders during such
period); and thereafter, the holder or holders of in excess of 50% of the
Percentage Interests of the Trust Certificate.

                                       11
<PAGE>

         Margin: With respect each Class of the Class A-1, Class A-2 and Class M
Notes and any Payment Date, the applicable percentage set forth below:

<Table>
<Caption>
                          Payment Dates on or prior           Payment Dates after the
                           to the Initial Optional              Initial Optional
        Class               Notes Purchase Date                Notes Purchase Date
        -----             -------------------------           -----------------------
<S>                       <C>                                 <C>
         A-1                        0.35%                             0.70%

         A-2                        0.50%                             1.00%

          M                         0.60%                             0.60%
</TABLE>

         Master Servicer: Wells Fargo Bank Minnesota, National Association, or
any successor Master Servicer appointed as herein provided.

         Master Servicer Certification: A written certification covering
servicing of the Mortgage Loans by all Servicers and signed by an officer of the
Master Servicer that complies with (i) the Sarbanes-Oxley Act of 2002, as
amended from time to time, and (ii) the February 21, 2003 Statement by the Staff
of the Division of Corporation Finance of the Securities and Exchange Commission
Regarding Compliance by Asset-Backed Issuers with Exchange Act Rules 13a-14 and
15d-14, as in effect from time to time; provided that if, after the Closing Date
(a) the Sarbanes-Oxley Act of 2002 is amended, (b) the Statement referred to in
clause (ii) is modified or superceded by any subsequent statement, rule or
regulation of the Securities and Exchange Commission or any statement of a
division thereof, or (c) any future releases, rules and regulations are
published by the Securities and Exchange Commission from time to time pursuant
to the Sarbanes-Oxley Act of 2002, which in any such case affects the form or
substance of the required certification and results in the required
certification being, in the reasonable judgment of the Master Servicer,
materially more onerous than the form of the required certification as of the
Closing Date, the Master Servicer Certification shall be as agreed to by the
Master Servicer, the Depositor and the Seller following a negotiation in good
faith to determine how to comply with any such new requirements.

         Master Servicer Event of Default: With respect to the Master Servicer,
any one of the conditions or circumstances enumerated in Section 6.01(a).

         Master Servicer Remittance Date: No later than 3 P.M. New York City
time one Business Day prior to each Payment Date.

         Master Servicing Fee: As to any Payment Date and each related Mortgage
Loan, an amount equal to the product of the applicable Master Servicing Fee Rate
and the Scheduled Principal Balance of such Mortgage Loan. The Master Servicing
Fee for any Mortgage Loan shall be payable in respect of any Payment Date solely
from the interest portion of the Monthly Payment or other payment or recovery
with respect to such Mortgage Loan.

         Master Servicing Fee Rate:  0.0175% per annum.

                                       12
<PAGE>

         Master Servicing Guide: Wells Fargo Conduit and Norwest Servicing
Guide, dated January 1997, as amended July 2001.

         Maturity Date: With respect to any Class of Notes, the Payment Date in
December 2033.

         Maximum Mortgage Rate: With respect to each Mortgage Loan, the
percentage set forth in the related Mortgage Note as the maximum Mortgage Rate
thereunder.

         MERS: Mortgage Electronic Registration Systems, Inc., a corporation
organized and existing under the laws of the State of Delaware, or any successor
thereto.

         MERS Mortgage Loan: Any Mortgage Loan registered with MERS on the MERS
System.

         MERS(R) System: The system of recording transfers of mortgages
electronically maintained by MERS.

         MIN: The Mortgage Identification Number for any MERS Mortgage Loan.

         Modifiable Mortgage Loan: Any Mortgage Loan which, at the option of the
Mortgagor and in accordance with the terms of the related Mortgage Note, may
have the related Mortgage Rate modified to any adjustable rate or hybrid product
offered at the time by the related originator.

         Modified Mortgage Loan: Any Modifiable Mortgage Loan as to which the
related Mortgagor has exercised the right to modify the Mortgage Rate.

         Modified Mortgage Loan Schedule: With respect to each Payment Date, a
schedule listing each Modifiable Mortgage Loan in the form set forth in Schedule
C hereto that has become a Modified Mortgage Loan during the immediately
preceding Due Period, and the Purchase Price for each such Modified Mortgage
Loan.

         MOM Loan: Any Mortgage Loan as to which MERS is acting as mortgagee,
solely as nominee for the originator of such Mortgage Loan and its successors
and assigns.

         Monthly Excess Cashflow: With respect to any Payment Date, the sum of
(x) Monthly Excess Interest for such date and (y) any Net Yield Maintenance
Amounts or Yield Maintenance Amounts received by the Indenture Trustee for the
account of the Issuer for such date.

         Monthly Excess Interest: With respect to any Payment Date, any Interest
Remittance Amount remaining after giving effect to payment pursuant to Section
5.06(b)(iii).

         Monthly Payment: With respect to any Mortgage Loan, the scheduled
monthly payment of principal and interest on such Mortgage Loan that is payable
by the related Mortgagor from time to time under the related Mortgage Note,
determined, for the purposes of this Agreement: (a) after giving effect to (i)
any Deficient Valuation and/or Debt Service Reduction with respect to such
Mortgage Loan and (ii) any reduction in the amount of interest collectible from
the related Mortgagor pursuant to the Relief Act; (b) without giving effect to
any extension granted

                                       13
<PAGE>

or agreed to by the related Servicer pursuant to the applicable provisions of
the related Servicing Agreement; and (c) on the assumption that all other
amounts, if any, due under such Mortgage Loan are paid when due.

         Moody's: Moody's Investors Service, Inc., or any successor in interest.

         Mortgage: The mortgage, deed of trust or other instrument creating a
first lien on, or first priority security interest in, a Mortgaged Property
securing a Mortgage Note.

         Mortgage File: The mortgage documents listed in Section 2.01 pertaining
to a particular Mortgage Loan required to be delivered to the Indenture Trustee
pursuant to this Agreement.

         Mortgage Loan: A Mortgage and the related notes or other evidences of
indebtedness secured by each such Mortgage conveyed, transferred, sold, assigned
to or deposited with the Indenture Trustee for the benefit of Securityholders
pursuant to Section 2.01 or Section 2.03(d), including without limitation, each
Mortgage Loan listed on the Mortgage Loan Schedule, as amended from time to
time.

         Mortgage Loan Purchase Agreement: The mortgage loan purchase agreement,
dated as of December 1, 2003, for the sale of the Mortgage Loans by the Seller
to the Depositor.

         Mortgage Loan Schedule: As of any date, the list of Mortgage Loans
attached hereto as Schedule A. The Mortgage Loan Schedule shall be prepared by
the Seller and shall set forth the following information with respect to each
Mortgage Loan:

          (i) the Mortgage Loan identifying number;

          (ii) the Mortgagor's name;

          (iii) the street address of the Mortgaged Property including the state
     and five-digit ZIP code;

          (iv) a code indicating whether the Mortgaged Property was represented
     by the borrower, at the time of origination, as being owner-occupied;

          (v) a code indicating whether the Residential Dwelling constituting
     the Mortgaged Property is (a) a detached single family dwelling, (b) a
     dwelling in a planned unit development, (c) a condominium unit, (d) a two-
     to four-unit residential property, (e) a townhouse or (f) other type of
     Residential Dwelling;

          (vi) if the related Mortgage Note permits the borrower to make Monthly
     Payments of interest only for a specified period of time, (a) the original
     number of such specified Monthly Payments and (b) the remaining number of
     such Monthly Payments as of the Cut-Off Date;

          (vii) the original months to maturity;

                                       14
<PAGE>

          (viii) the stated remaining months to maturity from the Cut-Off Date
     based on the original amortization schedule;

          (ix) the Loan-to-Value Ratio at origination;

          (x) the value of any Additional Collateral at origination;

          (xi) the Loan-to-Collateral Value Ratio at origination;

          (xii) the Mortgage Rate in effect immediately following the Cut-Off
     Date;

          (xiii) the date on which the first Monthly Payment is or was due on
     the Mortgage Loan;

          (xiv) the stated maturity date;

          (xv) the Master Servicing Fee Rate and the Servicing Fee Rate, if any;

          (xvi) whether such loan is an Additional Collateral Mortgage Loan or
     an Employee Loan;

          (xvii) the last Due Date on which a Monthly Payment was actually
     applied to the unpaid Scheduled Principal Balance;

          (xviii) the original principal balance of the Mortgage Loan;

          (xix) the Scheduled Principal Balance of the Mortgage Loan on the
     Cut-Off Date and a code indicating the purpose of the Mortgage Loan (i.e.,
     purchase financing, rate/term refinancing, cash-out refinancing);

          (xx) the Index and Gross Margin specified in related Mortgage Note;

          (xxi) the next Adjustment Date, if applicable;

          (xxii) the Maximum Mortgage Rate, if applicable;

          (xxiii) the Value of the Mortgaged Property;

          (xxiv) the sale price of the Mortgaged Property, if applicable;

          (xxv) the product code;

          (xxvi) the Retained Rate, if any; and

          (xxvii) the Servicer, if any, that is servicing each Mortgage Loan and
     the originator of the Mortgage Loan.

                                       15
<PAGE>

         Information set forth in clauses (ii) and (iii) above regarding each
Mortgagor and the related Mortgaged Property shall be confidential and the
Indenture Trustee (or Master Servicer) shall not unlawfully disclose such
information.

         The Mortgage Loan Schedule, as in effect from time to time, shall also
set forth the following information with respect to the Mortgage Loans in the
aggregate as of the Cut-Off Date: (1) the number of Mortgage Loans; (2) the
current principal balance of the Mortgage Loans; (3) the weighted average
Mortgage Rate of the Mortgage Loans; and (4) the weighted average remaining
months to maturity of the Mortgage Loans. The Mortgage Loan Schedule shall be
amended from time to time by the Seller in accordance with the provisions of
this Agreement.

         Mortgage Note: The note or other evidence of the indebtedness of a
Mortgagor secured by a Mortgage under a Mortgage Loan.

         Mortgaged Property: Either of (x) the fee simple or leasehold interest
in real property, together with improvements thereto including any exterior
improvements to be completed within 120 days of disbursement of the related
Mortgage Loan proceeds, or (y) in the case of a Cooperative Loan, the related
Cooperative Shares and Proprietary Lease, securing the indebtedness of the
Mortgagor under the related Mortgage Loan.

         Mortgage Rate: As to any Mortgage Loan and any date of determination,
the per annum rate at which interest then accrues on such Mortgage Loan, as
determined under the related Mortgage Note as reduced by applications of the
Relief Act.

         Mortgagor: The obligor on a Mortgage Note.

         Net Funds Cap: With respect any Payment Date and any Note, an annual
rate equal to (i) the weighted average of the Net Mortgage Rates of the Mortgage
Loans as of the first day of the related Due Period (or, in the case of the
first Payment Date, as of the Cut-off Date), weighted on the basis of the
related Scheduled Principal Balances of the Mortgage Loans as of the first day
of the related Due Period less (ii) a fraction, expressed as a percentage, the
numerator of which is the product of (1) the aggregate Net Yield Maintenance
Payments made by the Issuer on such Payment Date and (2) 12, and the denominator
of which is the Pool Balance as of the first day of the related Due Period.

         Net Liquidation Proceeds: With respect to any Liquidated Mortgage Loan
or any other disposition of related Mortgaged Property (including REO Property)
the related Liquidation Proceeds net of Advances, related Servicing Advances,
Master Servicing Fee, related Servicing Fees and any other accrued and unpaid
servicing fees received and retained in connection with the liquidation of such
Mortgage Loan or Mortgaged Property, and any related Retained Interest.

         Net Mortgage Rate: With respect to any Mortgage Loan as of any date of
determination, a per annum rate of interest equal to the then applicable
Mortgage Rate for such Mortgage Loan reduced by the then applicable Expense Fee
Rate for such Mortgage Loan.

                                       16
<PAGE>

         Net Prepayment Interest Shortfall: With respect to any Master Servicer
Remittance Date, the excess, if any, of any Prepayment Interest Shortfalls with
respect to the Mortgage Loans for such date over any amounts paid with respect
to such shortfalls by the Servicers or the Master Servicer pursuant to the
Servicing Agreements or this Agreement.

         Net Yield Maintenance Amount: For each Swap Agreement and any Payment
Date, the amount, if any, to be paid by the Yield Maintenance Counterparty to
the Indenture Trustee for the account of the Issuer pursuant to such Swap
Agreement.

         Net Yield Maintenance Payment: For each Swap Agreement and any Payment
Date, the amount, if any, to be paid by the Issuer to the Yield Maintenance
Counterparty, other than Additional Yield Maintenance Payments, pursuant to such
Swap Agreement.

         New York UCC: The Uniform Commercial Code as in effect in the State of
New York.

         Nonrecoverable: The determination by the Master Servicer or the related
Servicer in respect of a delinquent Mortgage Loan that if it were to make an
Advance in respect of thereof, such amount would not be recoverable from any
collections or other recoveries (including Liquidation Proceeds) on such
Mortgage Loan.

         Note:  Any Class A-1, Class A-2 and Class M Note.

         Note Account: The account maintained by the Indenture Trustee pursuant
to Section 5.04 which shall be entitled "Note Account, Deutsche Bank National
Trust Company, as Indenture Trustee, in trust for the registered Holders of
Thornburg Mortgage Securities Trust 2003-6, Mortgage-Backed Securities, Series
2003-6" and which must be an Eligible Account.

         Note Interest Rate: With respect to each Class of Notes and any Payment
Date, the applicable per annum rate set forth below:

<Table>
<Caption>
     Class                              Note Interest Rate
     -----                              ------------------
<S>              <C>
      A-1        The Note Interest Rate with respect to any Payment Date (and
                 the related Accrual Period) for the Class A-1 Notes is the per
                 annum rate equal to the lesser of (i) LIBOR plus the applicable
                 Margin and (ii) the lesser of (a) the Net Funds Cap for such
                 Payment Date and (b) 11.50% per annum.

      A-2        The Note Interest Rate with respect to any Payment Date (and
                 the related Accrual Period) for the Class A-2 Notes is the per
                 annum rate equal to the lesser of (i) LIBOR plus the applicable
                 Margin and (ii) the lesser of (a) the Net Funds Cap for such
                 Payment Date and (b) 11.50%.

       M         The Note Interest Rate with respect to any Payment Date (and
                 the related Accrual Period) for the Class M Notes is the per
                 annum rate equal to the lesser of (i) LIBOR plus the applicable
                 Margin and (ii) the lesser of (a) the Net Funds Cap for such
                 Payment Date and (b) 11.50% per annum.
</TABLE>

                                       17
<PAGE>

         Note Owner:  As defined in the Indenture.

         Note Principal Amount: With respect to any Note, the initial Note
Principal Amount thereof on the Closing Date, less the amount of all principal
payments previously paid with respect to such Note and, in the case of a Class M
or Class A-2 Note, any Applied Loss Amount previously allocated to such Note.

         Note Purchase Price:  As defined in the Indenture.

         Note Register and Note Registrar:   As defined in the Indenture.

         Noteholder:  As defined in the Indenture.

         Offering Document:  The Prospectus.

         Officer's Certificate: A certificate signed by the Chairman of the
Board, any Vice Chairman, the President, any Vice President or any Assistant
Vice President of a Person and, with respect to the Issuer, as defined in the
Indenture.

         Operative Agreements: The Trust Agreement, the Certificate of Trust of
the Issuer, this Agreement, the Mortgage Loan Purchase Agreement, the Indenture,
the Administration Agreement, the Yield Maintenance Agreements and each other
document contemplated by any of the foregoing to which the Depositor, the Owner
Trustee, the Administrator, the Indenture Trustee or the Issuer is a party.

         Opinion of Counsel: A written opinion of counsel, reasonably acceptable
in form and substance to the Indenture Trustee and the Issuer, and who may be
in-house or outside counsel to the Seller, the Depositor, the Master Servicer,
the Indenture Trustee, the Owner Trustee or the Issuer but which must be
Independent outside counsel with respect to any such opinion of counsel
concerning federal income tax matters.

         Optional Notes Purchase Right:  As defined in the Indenture.

         Optional Termination:  As defined in Section 7.03 hereof.

         Outstanding Mortgage Loan: As of any Due Date, a Mortgage Loan with a
Scheduled Principal Balance greater than zero, that was not the subject of a
prepayment in full prior to such Due Date and that did not become a Liquidated
Mortgage Loan prior to such Due Date.

         Overcollateralization Amount: With respect to any Payment Date, the
amount by which the Pool Balance for such Payment Date exceeds the aggregate
Note Principal Amount after giving effect to the payment of the Principal
Remittance Amount for such Payment Date.

         Overcollateralization Deficiency: With respect to any Payment Date, the
amount, if any, by which (x) the Targeted Overcollateralization Amount for such
Payment Date exceeds (y) the Overcollateralization Amount for such Payment Date,
calculated for this purpose after giving effect to the reduction on such Payment
Date of the Class Principal Amounts of the Notes

                                       18
<PAGE>

resulting from the distribution of the Principal Remittance Amount on such
Payment Date, but prior to allocation of any Applied Loss Amount on such Payment
Date.

         Owner Trustee: Wilmington Trust Company, a Delaware banking
corporation, and any successor in interest, not in its individual capacity, but
solely as owner trustee under the Trust Agreement.

         Payahead: With respect to any Mortgage Loan and any Due Date therefor,
any Monthly Payment received by the applicable Servicer during any Due Period in
addition to the Monthly Payment due on such Due Date, intended by the related
Mortgagor to be applied on a subsequent Due Date or Due Dates.

         Payment Date: The 25th day of each month or, if such day is not a
Business Day, the next Business Day, commencing in January 2004.

         Payment Date Statement:  As defined in Section 5.10(a) hereof.

         Percentage Interest: With respect to any Security, the Percentage
Interest evidenced thereby shall equal (1) in the case of a Trust Certificate,
the Percentage Interest on the face of such certificate or (ii) in the case of
any Note, the initial Note Principal Amount thereof divided by the initial Class
Principal Amount of all Notes of the same Class.

         Permitted Investments: Any one or more of the following obligations or
securities acquired at a purchase price of not greater than par, regardless of
whether issued or managed by the Depositor, the Master Servicer, the Indenture
Trustee, the Owner Trustee or any of their respective Affiliates or for which an
Affiliate of the Indenture Trustee, the Master Servicer or the Owner Trustee
serves as an advisor:

            (i) direct obligations of, or obligations fully guaranteed as to
         timely payment of principal and interest by, the United States or any
         agency or instrumentality thereof, provided such obligations are backed
         by the full faith and credit of the United States;

            (ii) demand and time deposits in, certificates of deposit of,
         bankers' acceptances issued by or federal funds sold by any depository
         institution or trust company (including the Indenture Trustee, the
         Master Servicer or the Owner Trustee or their agents acting in their
         respective commercial capacities) incorporated under the laws of the
         United States of America or any state thereof and subject to
         supervision and examination by federal and/or state authorities, so
         long as, at the time of such investment or contractual commitment
         providing for such investment, such depository institution or trust
         company or its ultimate parent has a short-term uninsured debt rating
         in one of the two highest available rating categories of each Rating
         Agency and (B) any other demand or time deposit or deposit which is
         fully insured by the FDIC;

            (iii) repurchase obligations with respect to any security described
         in clause (i) above and entered into with a depository institution or
         trust company (acting as principal) rated A or higher by each Rating
         Agency;

                                       19
<PAGE>

            (iv) securities bearing interest or sold at a discount that are
         issued by any corporation incorporated under the laws of the United
         States of America, the District of Columbia or any State thereof and
         that are rated by each Rating Agency in its highest long-term unsecured
         rating categories at the time of such investment or contractual
         commitment providing for such investment;

            (v) commercial paper (including both non-interest-bearing discount
         obligations and interest-bearing obligations) that is rated by each
         Rating Agency in its highest short-term unsecured debt rating available
         at the time of such investment;

            (vi) units of money market funds (which may be 12b-1 funds, as
         contemplated by the Commission under the Investment Company Act of
         1940) registered under the Investment Company Act of 1940 including
         funds managed or advised by the Indenture Trustee, the Master Servicer,
         the Owner Trustee or an affiliate thereof having the highest applicable
         rating from each Rating Agency; and

            (vii) if previously confirmed in writing to the Indenture Trustee,
         any other demand, money market or time deposit, or any other
         obligation, security or investment, as may be acceptable to each Rating
         Agency in writing as a permitted investment of funds backing securities
         having ratings equivalent to their respective highest initial ratings
         of the Class A-1 and Class A-2 Notes;

provided, however, that no instrument described hereunder shall evidence either
the right to receive (a) only interest with respect to the obligations
underlying such instrument or (b) both principal and interest payments derived
from obligations underlying such instrument and the interest and principal
payments with respect to such instrument provide a yield to maturity at par
greater than 120% of the yield to maturity at par of the underlying obligations.

         Person: Any individual, corporation, partnership, joint venture,
association, joint-stock company, limited liability company, trust,
unincorporated organization or government or any agency or political subdivision
thereof.

         Pool Balance: As to any Payment Date, the aggregate of the Scheduled
Principal Balances of the Mortgage Loans that were Outstanding Mortgage Loans on
that day.

         Prepayment Interest Shortfall: With respect to any Payment Date and any
full or partial Principal Prepayment of a Mortgage Loan received by a Servicer
in the prior calendar month and not included in the prior remittance, the
excess, if any, of (i) one full month's interest at the applicable Mortgage Rate
(as reduced by the Servicing Fee or the Master Servicing Fee, as applicable, in
the case of Principal Prepayments in full), on the outstanding principal balance
of such Mortgage Loan immediately prior to such prepayment over (ii) the amount
of interest actually received by the related Servicer with respect to such
Mortgage Loan in connection with such Principal Prepayment.

         Prepayment Penalty Amount: With respect to any Mortgage Loan and each
Payment Date, all premiums or charges, if any, paid by Mortgagors under the
related Mortgage Notes as a result of full or partial Principal Prepayments
collected by the applicable Servicer during the

                                       20
<PAGE>

immediately preceding Prepayment Period, but only to the extent required to be
remitted to the Master Servicer on the applicable Servicer Remittance Date under
the terms of the related Servicing Agreement.

         Prepayment Period: With respect to any Payment Date, the calendar month
preceding the month in which such Payment Date occurs.

         Primary Insurance Policy: Mortgage guaranty insurance, if any, on an
individual Mortgage Loan, as evidenced by a policy or certificate.

         Principal Payment Amount: With respect to any Payment Date, the sum of
(i) the Principal Remittance Amount for such date and (ii) the Extra Principal
Payment Amount, if any, for such date.

         Principal Prepayment: Any payment of principal made by the Mortgagor on
a Mortgage Loan that is received in advance of its scheduled Due Date and that
is not accompanied by an amount of interest representing the full amount of
scheduled interest due on any Due Date in any month or months subsequent to the
month of prepayment.

         Principal Remittance Amount: With respect to any Payment Date and with
respect to all of the Mortgage Loans, (a) the sum of (1) all principal collected
(other than Payaheads) or advanced in respect of Monthly Payments on the
Mortgage Loans during the related Due Period whether by a Servicer or the Master
Servicer (less unreimbursed Advances due to the Master Servicer or any Servicer
with respect to the related Mortgage Loans, to the extent allocable to
principal), (2) all Principal Prepayments in full or in part received (or deemed
by the Master Servicer to have been received) during the related Prepayment
Period on the Mortgage Loans, (3) the portion of any Purchase Price with respect
to any Mortgage Loan that was purchased from the Trust Estate during the related
Prepayment Period allocable to principal, (4) the portion of any Substitution
Amount paid with respect to any Deleted Mortgage Loan relating to a Mortgage
Loan during the related Prepayment Period allocable to principal, (5) the
principal portion of any amount paid under the Guaranty Surety Bond, (6) all Net
Liquidation Proceeds, Insurance Proceeds and other recoveries collected with
respect to such Mortgage Loans during the related Prepayment Period, to the
extent allocable to principal, and (7) the portion of any Termination Price
allocable to principal received in connection with an Optional Termination
pursuant to Section 7.03, as reduced by (b) other costs, expenses or liabilities
reimbursable to the Indenture Trustee, the Administrator, the Master Servicer,
the Owner Trustee and each Servicer to the extent provided in the Operative
Agreements and each Servicing Agreement and to the extent not reimbursed thereto
from the Interest Remittance Amount or otherwise.

         Proprietary Lease: With respect to any Cooperative Unit, a lease or
occupancy agreement between a Cooperative Corporation and a holder of related
Cooperative Shares.

         Prospectus: The prospectus supplement dated December 12, 2003, together
with the accompanying prospectus dated August 26, 2003, relating to the Class
A-1, Class A-2 and Class M Notes, as they may be supplemented from time to time.

                                       21
<PAGE>

         Purchase Price: With respect to the purchase of a Mortgage Loan or
related REO Property pursuant to this Agreement, an amount equal to the sum of
(a) 100% of the unpaid principal balance of such Mortgage Loan plus (b) (i) in
the case of a Mortgage Loan, accrued interest thereon at the applicable Mortgage
Rate, from the date as to which interest was last paid to (but not including)
the Due Date in the Due Period immediately preceding the related Payment Date or
(ii) in the case of an REO Property, the sum of (1) accrued interest at the
applicable Mortgage Rate from the date as to which interest was last covered by
a payment by the Mortgagor to the Due Date in the related Due Period plus (2)
REO Imputed Interest for such REO Property for each calendar month commencing
with the calendar month in which such REO Property was acquired and ending with
the calendar month in which such purchase is to be effected, net of the total of
all net rental income, Insurance Proceeds and Liquidation Proceeds that as of
the date of purchase had been distributed as or to cover REO Imputed Interest,
plus (c) in each case, any unreimbursed Servicing Advances and fees allocable to
such Mortgage Loan or REO Property, plus (d) in the case of a Mortgage Loan
required to be purchased pursuant to Section 3.03 hereof, expenses reasonably
incurred or to be incurred by the Indenture Trustee in respect of the breach or
defect giving rise to the purchase obligation and plus (e) any cost or damages
incurred by the Issuer as a result of any violation of any applicable federal,
state or local predatory or abusive lending law.

         Qualified Insurer: A mortgage guaranty insurance company duly qualified
as such under the laws of the state of its principal place of business and each
state having jurisdiction over such insurer in connection with the insurance
policy issued by such insurer, duly authorized and licensed in such states to
transact a mortgage guaranty insurance business in such states and to write the
insurance provided by the insurance policy issued by it, approved as a Fannie
Mae-approved mortgage insurer and having a claims paying ability rating of at
least "AA" or equivalent rating by a nationally recognized statistical rating
organization. Any replacement insurer with respect to a Mortgage Loan must have
at least as high a claims paying ability rating as the insurer it replaces had
on the Closing Date.

         Qualified Substitute Mortgage Loan: A mortgage loan substituted for a
Deleted Mortgage Loan pursuant to the terms of this Agreement which must, on the
date of such substitution, (i) have an outstanding principal balance, after
application of all scheduled payments of principal and interest due during or
prior to the month of substitution, not in excess of, and not more than 5% less
than, the principal balance of the Deleted Mortgage Loan as of the Due Date in
the calendar month during which the substitution occurs, (ii) have a maximum
mortgage rate not less than the Maximum Mortgage Rate of the Deleted Mortgage
Loan, (iii) have a gross margin equal to or greater than the Gross Margin of the
Deleted Mortgage Loan, (iv) have the same Index as the Deleted Mortgage Loan,
(v) have its next adjustment date not more than two months after the next
Adjustment Date of the Deleted Mortgage Loan, (vi) have a remaining term to
maturity not greater than (and not more than one year less than) that of the
Deleted Mortgage Loan, (vii) be current as of the date of substitution, (viii)
have a Loan-to-Value Ratio and a Loan-to-Collateral Value Ratio as of the date
of substitution equal to or lower than the Loan-to-Value Ratio and the
Loan-to-Collateral Value Ratio, respectively, of the Deleted Mortgage Loan as of
such date, (ix) have been underwritten or re-underwritten in accordance with the
same or substantially similar underwriting criteria and guidelines as the
Deleted Mortgage Loan, (x) be of the same or better credit quality as the
Deleted Mortgage Loan

                                       22
<PAGE>

and (xi) conform to each representation and warranty set forth in Section 3.04
hereof applicable to the Deleted Mortgage Loan. In the event that one or more
mortgage loans are substituted for one or more Deleted Mortgage Loans, the
amounts described in clause (i) hereof shall be determined on the basis of
aggregate principal balances, the terms described in clause (vi) hereof shall be
determined on the basis of weighted average remaining term to maturity, the
Loan-to-Value Ratio and Loan-to-Collateral Value Ratio described in clause
(viii) hereof shall be satisfied as to each such mortgage loan and, except to
the extent otherwise provided in this sentence, the representations and
warranties described in clause (x) hereof must be satisfied as to each Qualified
Substitute Mortgage Loan or in the aggregate, as the case may be.

         Rating Agency:  Each of Moody's and/or S&P.

         Realized Loss: With respect to any Liquidated Mortgage Loan, the
portion of the principal balance remaining unpaid after application of all Net
Liquidation Proceeds in respect of such Liquidated Mortgage Loan.

         Recognition Agreement: With respect to any Cooperative Loan, an
agreement between the related Cooperative Corporation and the originator of such
Mortgage Loan to establish the rights of such originator in the related
Cooperative Property.

         Record Date: With respect to the Notes and any Payment Date, the close
of business on the Business Day immediately preceding such Payment Date. With
respect to the Trust Certificates and any Payment Date, the last Business Day of
the month immediately preceding the month in which the Payment Date occurs (or,
in the case of the first Payment Date, the Closing Date).

         Redemption Price:  As defined in the Indenture.

         Refinancing Mortgage Loan: Any Mortgage Loan originated in connection
with the refinancing of an existing mortgage loan.

         Relevant UCC: The Uniform Commercial Code as in effect in the
applicable jurisdiction.

         Relief Act: The Soldiers' and Sailors' Civil Relief Act of 1940, as
amended, or similar state laws.

         REO Disposition: The sale or other disposition of an REO Property on
behalf of the Issuer.

         REO Imputed Interest: As to any REO Property, for any calendar month
during which such REO Property was at any time part of the Trust Estate, one
month's interest at the applicable Net Mortgage Rate on the principal balance of
such REO Property (or, in the case of the first such calendar month, of the
related Mortgage Loan if appropriate) as of the close of business on the Due
Date in such calendar month.

                                       23
<PAGE>

         REO Property: A Mortgaged Property acquired by the Master Servicer or
the applicable Servicer through foreclosure or deed-in-lieu of foreclosure in
accordance with the applicable provisions of the related Servicing Agreement.

         Residential Dwelling: Any one of the following: (i) a detached
one-family dwelling, (ii) a detached two- to four-family dwelling, (iii) a
one-family dwelling unit in a condominium project, (iv) a manufactured home, (v)
a cooperative unit or (vi) a detached one-family dwelling in a planned unit
development, none of which is a mobile home.

         Responsible Officer: Any vice president, any assistant vice president,
any associate, any corporate trust officer or any other officer of the Indenture
Trustee customarily performing functions similar to those performed by any of
the above-designated officers and, in each case, having direct responsibility
for the administration of the Operative Agreements and also, with respect to a
particular matter, any other officer to whom such matter is referred because of
such officer's knowledge of and familiarity with the particular subject.

         Retained Interest: As to any Employee Loans originated by Thornburg and
each Payment Date, interest accrued on the principal balance thereof at the
Retained Rate.

         Retained Interest Holder: With respect to each Employee Loan, the
Seller or any successor in interest by assignment or otherwise.

         Retained Rate: As of the Cut-off Date, and for each Due Period
thereafter, 0.00% per annum; provided, however, if the related Mortgagor of the
Employee Loan ceases to be an employee or a director of Thornburg or its
Affiliates, the amount of the increase in the per annum rate set forth in the
related Mortgage Note.

         S&P: Standard & Poor's Ratings Services, a division of The McGraw-Hill
Companies, Inc., or any successor in interest.

         Scheduled Principal Balance: With respect to (i) any Mortgage Loan as
of any Payment Date or other date of determination, the principal balance of
such Mortgage Loan at the close of business on the Cut-off Date, after giving
effect to principal payments due on or before the Cut-off Date, whether or not
received, less an amount equal to principal payments due after the Cut-off Date
and on or before the Due Date in the related Due Period, whether or not received
from the Mortgagor or advanced by any Servicer or the Master Servicer, and all
amounts allocable to unscheduled principal payments (including Principal
Prepayments, Liquidation Proceeds, Insurance Proceeds and condemnation proceeds,
in each case to the extent identified and applied prior to or during the related
Prepayment Period) and (ii) any REO Property as of any Payment Date, the
Scheduled Principal Balance of the related Mortgage Loan on the Due Date
immediately preceding the date of acquisition of such REO Property by or on
behalf of the Indenture Trustee (reduced by any amount applied as a reduction of
principal on the Mortgage Loan). Any Liquidated Mortgage Loan will have a
Scheduled Principal Balance equal to zero. As of the Cut-off Date, the Mortgage
Loans had an aggregate Scheduled Principal Balance of $1,089,744,587.13.

         Securities:  Any Note or Trust Certificate.

                                       24
<PAGE>

         Securities Intermediary: The Person acting as Securities Intermediary
under this Agreement (which is Deutsche Bank National Trust Company), its
successor in interest, and any successor Securities Intermediary appointed
pursuant to Section 5.09.

         Security Agreement: With respect to any Cooperative Loan, the agreement
between the owner of the related Cooperative Shares and the originator of the
related Mortgage Note that defines the terms of the security interest in such
Cooperative Shares and the related Proprietary Lease.

         Security Entitlement: The meaning specified in Section 8-102(a)(17) of
the New York UCC.

         Securityholders: The Noteholders and the Certificateholders.

         Seller: Thornburg.

         Senior Note:  Any Class A-1 or Class A-2 Note.

         Servicer Remittance Date: With respect to each Mortgage Loan, the 18th
day of each month, or the next Business Day if such 18th day is not a Business
Day.

         Servicers: The servicers listed on Exhibit D or any successors in
interest.

         Servicing Account: Any account established and maintained for the
benefit of the Master Servicer or the Indenture Trustee by a Servicer with
respect to the related Mortgage Loans and any REO Property, pursuant to the
terms of the respective Servicing Agreement.

         Servicing Advances: With respect to any Servicer or the Master
Servicer, all customary, reasonable and necessary "out of pocket" costs and
expenses (including reasonable attorneys' fees and expenses) incurred by any
Servicer or the Master Servicer in the performance of its servicing obligations
hereunder, including, but not limited to, the cost of (i) the preservation,
restoration, inspection and protection of the Mortgaged Property, (ii) any
enforcement or judicial proceedings, including foreclosures, (iii) the
management and liquidation of the REO Property and (iv) compliance with the
obligations under Article IV hereof or the related Servicing Agreements.

         Servicing Agreement: Each Servicing Agreement listed on Exhibit C and
any other servicing agreement entered into between a successor servicer and the
Seller or Issuer pursuant to the terms of this Agreement.

         Servicing Fee: As to any Payment Date and each Mortgage Loan, an amount
equal to the product of (a) one-twelfth of the Servicing Fee Rate and (b) the
Scheduled Principal Balance of such Mortgage Loan as of the first day of the
related Due Period.

         Servicing Fee Rate: With respect to each Mortgage Loan, the rate
specified in the related Servicing Agreement and as set forth on the Mortgage
Loan Schedule.

                                       25
<PAGE>
         Servicing Officer: Any officer of a Servicer or the Master Servicer
involved in or responsible for the administration and servicing or master
servicing of the Mortgage Loans whose name appears on a list of servicing
officers furnished by such Servicer or the Master Servicer to the Indenture
Trustee, as such list may from time to time be amended.

         Seven-Year Hybrid Mortgage Loans: The Mortgage Loans set forth on
Schedule F hereto.

         Significant Modification: As defined in Section 4.18(b).

         Significant Modification Loan: As defined in Section 4.18(b).

         Subordinate Note: Any Class M Note.

         Substitution Amount: As defined in Section 3.03(d) hereof.

         Surety: Ambac Assurance Corporation (formerly known as AMBAC Indemnity
Corporation), or any successor thereto, as issuer of the Guaranty Surety Bond.

         Swap Agreement: Each of the four swap agreements dated December 22,
2003, by and between the Yield Maintenance Counterparty and the Issuer,
including the ISDA Master Agreement dated as of December 22, 2003 between the
Yield Maintenance Counterparty and the Issuer, the schedule thereto and the
related confirmations (Ref. Nos., 433533, 433537, 433541 and 433545).

         Targeted Overcollateralization Amount: With respect to any Payment
Date, an amount equal to 0.25% of the Cut-off Date Balance.

         Telerate Page 3750: The display currently so designated as "Page 3750"
on the Bridge Telerate Service (or such other page selected by the Master
Servicer as may replace Page 3750 on that service for the purpose of displaying
daily comparable rates on prices).

         Ten-Year Hybrid Mortgage Loans: The Mortgage Loans set forth on
Schedule G hereto.

         Thornburg: Thornburg Mortgage Home Loans, Inc., a Delaware corporation,
and its successors and assigns.

         Three-Year Hybrid Mortgage Loans: The Mortgage Loans set forth on
Schedule D hereto.

         Title Insurance Policy: A title insurance policy maintained with
respect to a Mortgage Loan.

         TMI: Thornburg Mortgage Inc., a Maryland corporation, and its
successors and assigns.

         Trust Account Property: The Trust Accounts, the Certificate Account,
all amounts and investments held from time to time in the Trust Accounts, the
Certificate Account (whether in

                                       26
<PAGE>

the form of deposit accounts, physical property, book-entry securities,
uncertificated securities, securities entitlements, investment property or
otherwise) and all proceeds of the foregoing.

         Trust Accounts:  The Note Account and the Yield Maintenance Account.

         Trust Agreement: The trust agreement dated as of December 1, 2003,
among the Depositor, the Administrator and the Owner Trustee, as such may be
amended or supplemented from time to time.

         Trust Certificate: Any Trust Certificate evidencing the ownership
interest in the Issuer, substantially in the form attached as Exhibit A of the
Trust Agreement.

         Trust Estate: The assets subject to this Agreement and the Indenture,
(including those transferred by the Depositor to the Issuer) and pledged by the
Issuer to the Indenture Trustee, which assets consist of all accounts, accounts
receivable, contract rights, general intangibles, chattel paper, instruments,
documents, money, deposit accounts, certificates of deposit, goods, notes,
drafts, letters of credit, advices of credit, investment property,
uncertificated securities and rights to payment of any and every kind consisting
of, arising from or relating to any of the following: (a) the Mortgage Loans
listed in the Mortgage Loan Schedule and principal due and payable after the
Cut-off Date (including Prepayment Penalty Amounts), but not including interest
and principal due and payable on any Mortgage Loans on or before the Cut-off
Date (but excluding any Retained Interest), together with the Mortgage Files
relating to such Mortgage Loans; (b) any Insurance Proceeds, REO Property,
Liquidation Proceeds and other recoveries (in each case, subject to clause (a)
above), (c) the Collection Account, the Note Account, any Servicing Account, any
Escrow Account, the Yield Maintenance Account and all amounts deposited therein
pursuant to the applicable provisions of this Agreement, (d) any Insurance
Policies, (e) the rights of the Depositor under the Mortgage Loan Purchase
Agreement, (f) Depositor's security interest in the Additional Collateral, (g)
the Guaranty Surety Bond with respect to the Additional Collateral Mortgage
Loans conveyed to the Seller from Cendant, (h) the rights of the Seller under
each Servicing Agreement with respect to the Mortgage Loans, (i) the Yield
Maintenance Agreements and all payments thereunder, and (j) all income,
revenues, issues, products, revisions, substitutions, replacements, profits,
rents and all cash and non-cash proceeds of the foregoing.

         UCC: The Uniform Commercial Code as enacted in the relevant
jurisdiction.

         Underwriters: Lehman Brothers Inc., Bear, Stearns & Co. Inc. and
Greenwich Capital Markets, Inc.

         Uniform Commercial Code: The Uniform Commercial Code as in effect in
any applicable jurisdiction from time to time.

         Uninsured Cause: Any cause of damage to a Mortgaged Property such that
the complete restoration of such property is not fully reimbursable by the
hazard insurance policies required to be maintained on such Mortgaged Property.

                                       27
<PAGE>
         Unpaid Basis Risk Shortfall: With respect to any Payment Date and any
Note, the aggregate of all Basis Risk Shortfalls with respect to such Note
remaining unpaid from previous Payment Dates, plus interest accrued thereon at
the applicable Note Interest Rate (calculated without giving effect to the Net
Funds Cap but limited to a per annum rate no greater than 11.50%.

         Value: With respect to any Mortgage Loan and the related Mortgaged
Property, the lesser of:

             (i) the value of such Mortgaged Property as determined by an
         appraisal made for the originator of the Mortgage Loan at the time of
         origination of the Mortgage Loan by an appraiser who met the minimum
         requirements of Fannie Mae and Freddie Mac; and

             (ii) the purchase price paid for the related Mortgaged Property by
         the Mortgagor with the proceeds of the Mortgage Loan;

provided, however, that in the case of a Refinancing Mortgage Loan, such value
of the Mortgaged Property is based solely upon the value determined by an
appraisal made for the originator of such Refinancing Mortgage Loan at the time
of origination by an appraiser who met the minimum requirements of Fannie Mae
and Freddie Mac.

         Yield Maintenance Account: The account maintained by the Indenture
Trustee pursuant to Section 5.05 which shall be entitled "Yield Maintenance
Account, Deutsche Bank National Trust Company, as Indenture Trustee, in trust
for the registered Holders of Thornburg Mortgage Securities Trust 2003-6,
Mortgage-Backed Securities, Series 2003-6" and which must be an Eligible
Account.

         Yield Maintenance Agreements: The Swap Agreements and the Cap
Agreements.

         Yield Maintenance Amount: For each Cap Agreement and any Payment Date,
the amount, if any, to be paid to the Indenture Trustee for the account of the
Issuer pursuant to such Cap Agreement, as calculated by the Yield Maintenance
Counterparty based on information in the Payment Date Statement delivered to it
pursuant to Section 5.10 on the Business Day prior to the immediately preceding
Payment Date.

         Yield Maintenance Counterparty: Lehman Brothers Derivative Products
Inc. and its successors and assigns.

         Section 1.02 Calculations Respecting Mortgage Loans.

         Calculations required to be made pursuant to this Agreement with
respect to any Mortgage Loan in the Trust Estate shall be made based upon
current information as to the terms of the Mortgage Loans and reports of
payments received from the Mortgagor on such Mortgage Loans and payments to be
made to the Indenture Trustee as supplied to the Indenture Trustee by the Master
Servicer. The Indenture Trustee shall not be required to recompute, verify or
recalculate the information supplied to it by the Master Servicer or any
Servicer.

                                       28
<PAGE>
         Section 1.03 Calculations Respecting Accrued Interest.

         Accrued interest, if any, on any Note shall be calculated based upon a
360-day year consisting of twelve 30-day months.

                                   ARTICLE II

                          CONVEYANCE OF MORTGAGE LOANS

         Section 2.01 Conveyance of Mortgage Loans.

         (a) In consideration of the Issuer's delivery of the Notes and the
Trust Certificate to the Depositor or its designee, and concurrently with the
execution and delivery of this Agreement, the Depositor does hereby transfer,
assign, set over, deposit with and otherwise convey to the Issuer, without
recourse, subject to Sections 2.02, 2.03, 3.03 and 3.04, in trust, all the
right, title and interest of the Depositor in and to the Trust Estate. The
Indenture Trustee declares that, subject to the review provided for in Section
2.02, it has received and shall hold the Trust Estate, as Indenture Trustee, in
trust, for the benefit and use of the Securityholders and for the purposes and
subject to the terms and conditions set forth in this Agreement and the
Indenture. Concurrently with such receipt, the Issuer has issued and delivered
the Securities to or upon the order of the Depositor, in exchange for the Trust
Estate.

         Upon the issuance of the Securities, ownership in the Trust Estate
shall be vested in the Issuer, subject to the lien created by the Indenture in
favor of the Indenture Trustee, for the benefit of the Securityholders. The
foregoing sale, transfer, assignment, set-over, deposit and conveyance does not
and is not intended to result in creation or assumption by the Indenture Trustee
of any obligation of the Depositor, the Seller, or any other Person in
connection with the Mortgage Loans or any other agreement or instrument relating
thereto except as specifically set forth herein.

         In addition, with respect to any Additional Collateral Mortgage Loan,
the Depositor does hereby transfer, assign, set-over and otherwise convey to the
Issuer without recourse (except as provided herein) (i) its rights as assignee
under any security agreements, pledge agreements or guarantees relating to the
Additional Collateral supporting any Additional Collateral Mortgage Loan, (ii)
its security interest in and to any Additional Collateral, (iii) its right to
receive payments in respect of any Additional Collateral Mortgage Loan pursuant
to the related Servicing Agreement and (iv) its rights as beneficiary under the
Guaranty Surety Bond related in respect of any Additional Collateral Mortgage
Loans conveyed to the Seller from Cendant.

         In connection with such transfer and assignment, the Seller, on behalf
of the Depositor, does hereby deliver on the Closing Date, unless otherwise
specified in this Section 2.01, to, and deposit with the Indenture Trustee, or
the Custodian as its designated agent, the following documents or instruments
with respect to each Mortgage Loan (a "Mortgage File") so transferred and
assigned:

         (i)      the original Mortgage Note, endorsed (other than for a MOM
                  Loan) either on its face or by allonge attached thereto in
                  blank or in the following form: "Pay to the

                                       29
<PAGE>
                  order of Deutsche Bank National Trust Company, as Indenture
                  Trustee for Thornburg Mortgage Securities Trust 2003-6,
                  without recourse", or with respect to any lost Mortgage Note,
                  an original Lost Note Affidavit stating that the original
                  mortgage note was lost, misplaced or destroyed, together with
                  a copy of the related mortgage note; provided, however, that
                  such substitutions of Lost Note Affidavits for original
                  Mortgage Notes may occur only with respect to Mortgage Loans
                  the aggregate related Cut-Off Date Balance of which is less
                  than or equal to 2% of the Cut-Off Date Balance;

         (ii)     the original of any guarantee, security agreement or pledge
                  agreement relating to any Additional Collateral, if
                  applicable, and executed in connection with the Mortgage Note,
                  assigned to the Indenture Trustee on behalf of the Issuer;

         (iii)    except as provided below, for each Mortgage Loan that is not a
                  MERS Mortgage Loan, the original Mortgage, and in the case of
                  each MERS Mortgage Loan, the original Mortgage, noting the
                  presence of the MIN for that Mortgage Loan and either language
                  indicating that the Mortgage Loan is a MOM Loan if the
                  Mortgage Loan is a MOM Loan, or if such Mortgage Loan was not
                  a MOM Loan at origination, the original Mortgage and the
                  assignment to MERS, in each case with evidence of recording
                  thereon, and the original recorded power of attorney, if the
                  Mortgage was executed pursuant to a power of attorney, with
                  evidence of recording thereon or, if such Mortgage or power of
                  attorney has been submitted for recording but has not been
                  returned from the applicable public recording office, has been
                  lost or is not otherwise available, a copy of such Mortgage or
                  power of attorney, as the case may be, together with an
                  Officer's Certificate of the Seller certifying that the copy
                  of such Mortgage delivered to the Indenture Trustee (or its
                  Custodian) is a true copy and that the original of such
                  Mortgage has been forwarded to the public recording office,
                  or, in the case of a Mortgage that has been lost, a copy
                  thereof (certified as provided for under the laws of the
                  appropriate jurisdiction) and a written Opinion of Counsel
                  (delivered at the Seller's expense) acceptable to the
                  Indenture Trustee and the Depositor that an original recorded
                  Mortgage is not required to enforce the Indenture Trustee's
                  interest in the Mortgage Loan;

         (iv)     the original of each assumption, modification or substitution
                  agreement, if any, relating to the Mortgage Loans, or, as to
                  any assumption, modification or substitution agreement which
                  cannot be delivered on or prior to the Closing Date because of
                  a delay caused by the public recording office where such
                  assumption, modification or substitution agreement has been
                  delivered for recordation, a photocopy of such assumption,
                  modification or substitution agreement, pending delivery of
                  the original thereof, together with an Officer's Certificate
                  of the Seller certifying that the copy of such assumption,
                  modification or substitution agreement delivered to the
                  Indenture Trustee (or its custodian) on behalf of the Issuer
                  is a true copy and that the original of such agreement has
                  been forwarded to the public recording office;

                                       30
<PAGE>
         (v)      in the case of each Mortgage Loan that is not a MERS Mortgage
                  Loan, an original Assignment of Mortgage, in form and
                  substance acceptable for recording. The Mortgage shall be
                  assigned to "Deutsche Bank National Trust Company, as
                  Indenture Trustee for Thornburg Mortgage Securities Trust
                  2003-6, without recourse";

         (vi)     in the case of each Mortgage Loan that is not a MERS Mortgage
                  Loan, an original copy of any intervening Assignment of
                  Mortgage showing a complete chain of assignments, or, in the
                  case of an intervening Assignment of Mortgage that has been
                  lost, a written Opinion of Counsel (delivered at the Seller's
                  expense) acceptable to the Indenture Trustee that such
                  original intervening Assignment of Mortgage is not required to
                  enforce the Indenture Trustee's interest in the Mortgage
                  Loans;

         (vii)    the original Primary Insurance Policy, if any, or certificate,
                  if any;

         (viii)   the original or a certified copy of lender's title insurance
                  policy;

         (ix)     the original or copies of each assumption, modification,
                  written assurance or substitution agreement, if any; and

         (x)      with respect to any Cooperative Loan, the Cooperative Loan
                  Documents.

         In connection with the assignment of any MERS Mortgage Loan, the Seller
agrees that it will take (or shall cause the applicable Servicer to take), at
the expense of the Seller (with the cooperation of the Depositor, the Issuer,
the Indenture Trustee and the Master Servicer), such actions as are necessary to
cause the MERS(R) System to indicate that such Mortgage Loans have been assigned
by the Seller to the Indenture Trustee in accordance with this Agreement and the
Indenture for the benefit of the Securityholders by including (or deleting, in
the case of Mortgage Loans that are repurchased in accordance with this
Agreement) in such computer files the information required by the MERS(R) System
to identify the series of the Notes issued in connection with the transfer of
such Mortgage Loans to the Thornburg Mortgage Securities Trust 2003-6.

         With respect to each Cooperative Loan, the Seller, on behalf of the
Depositor does hereby deliver to the Indenture Trustee the related Cooperative
Loan Documents and the Seller will take (or shall cause the applicable Servicer
to take), at the expense of the Seller (with the cooperation of the Depositor,
the Indenture Trustee and the Master Servicer) such actions as are necessary
under applicable law (including but not limited to the relevant UCC) in order to
perfect the interest of the Indenture Trustee in the related Mortgaged Property.

         Assignments of each Mortgage with respect to each Mortgage Loan that is
not a MERS Mortgage Loan (other than a Cooperative Loan) shall be recorded;
provided, however, that such assignments need not be recorded if, in the Opinion
of Counsel (which must be from Independent Counsel and not at the expense of the
Issuer or the Indenture Trustee) acceptable to the Indenture Trustee, the Rating
Agencies and the Master Servicer, recording in such states is not required to
protect the Indenture Trustee's interest in the related Mortgage Loans;
provided,

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<PAGE>
however, notwithstanding the delivery of any Opinion of Counsel, each Assignment
of Mortgage shall be submitted for recording by the Seller (or the Seller will
cause the applicable Servicer to submit each such assignment for recording), at
the cost and expense of the Seller, in the manner described above, at no expense
to the Issuer or Indenture Trustee, upon the earliest to occur of (1) the
occurrence of a bankruptcy or insolvency relating to the Seller or the
Depositor, or (2) with respect to any one Assignment of Mortgage, the occurrence
of a bankruptcy, insolvency or foreclosure relating to the Mortgagor under the
related Mortgage. Subject to the preceding sentence, as soon as practicable
after the Closing Date (but in no event more than three months thereafter except
to the extent delays are caused by the applicable recording office), the Seller
shall properly record (or the Seller will cause the applicable Servicer to
properly record), at the expense of the Seller (with the cooperation of the
Depositor, the Indenture Trustee, the Issuer and the Master Servicer), in each
public recording office where the related Mortgages are recorded, each
assignment referred to in Section 2.01(v) above with respect to a Mortgage Loan
that is not a MERS Mortgage Loan.

         The Indenture Trustee agrees to execute and deliver to the Depositor on
or prior to the Closing Date an acknowledgment of receipt of the original
Mortgage Note (with any exceptions noted), substantially in the form attached as
Exhibit A-1 hereto.

         If the original lender's title insurance policy, or a certified copy
thereof, was not delivered pursuant to Section 2.01(viii) above, the Seller
shall deliver or cause to be delivered to the Indenture Trustee the original or
a copy of a written commitment or interim binder or preliminary report of title
issued by the title insurance or escrow company, with the original or a
certified copy thereof to be delivered to the Indenture Trustee, promptly upon
receipt thereof, but in any case within 175 days of the Closing Date. The Seller
shall deliver or cause to be delivered to the Indenture Trustee, promptly upon
receipt thereof, any other documents constituting a part of a Mortgage File
received with respect to any Mortgage Loan sold to the Depositor by the Seller,
including, but not limited to, any original documents evidencing an assumption
or modification of any Mortgage Loan.

         For Mortgage Loans (if any) that have been prepaid in full after the
Cut-off Date and prior to the Closing Date, the Seller, in lieu of delivering
the above documents, herewith delivers to the Indenture Trustee, or to the
Custodian on behalf of the Indenture Trustee, an Officer's Certificate which
shall include a statement to the effect that all amounts received in connection
with such prepayment that are required to be deposited in the Collection Account
have been so deposited. All original documents that are not delivered to the
Indenture Trustee on behalf of the Issuer shall be held by the Master Servicer
or the applicable Servicer in trust for the Indenture Trustee, for the benefit
of the Issuer and the Securityholders.

         Upon discovery or receipt of notice of any materially defective
document in, or that a document is missing from, a Mortgage File, the Seller
shall have 90 days to cure such defect or deliver such missing document to the
Indenture Trustee. If the Seller does not cure such defect or deliver such
missing document within such time period, the Seller shall either repurchase or
substitute for such Mortgage Loan in accordance with Section 3.03 hereof.

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<PAGE>

         Section 2.02 Acceptance of Trust Estate; Review of Documentation.

         Subject to the provisions of Section 2.01, the Owner Trustee, on behalf
of the Issuer, acknowledges receipt of the assets transferred by the Depositor
and included in the Trust Estate and has directed that the documents referred to
in Section 2.01 and all other assets included in the definition of "Trust
Estate" be delivered to the Indenture Trustee (or the Custodian) on its behalf.

         The Indenture Trustee hereby accepts its appointment as Custodian
hereunder and acknowledges the receipt, subject to the provisions of Section
2.01 and subject to the review described below and any exceptions noted on the
exception report described in the next paragraph below, of the documents
referred to in Section 2.01 above and all other assets included in the
definition of "Trust Estate" and declares that, in its capacity as Custodian, it
holds and will hold such documents and the other documents delivered to it
constituting a Mortgage File, and that it holds or will hold all such assets and
such other assets included in the definition of "Trust Estate" in trust for the
exclusive use and benefit of all present and future Securityholders.

         The Indenture Trustee further agrees, for the benefit of the
Securityholders, to review each Mortgage File delivered to it and to certify and
deliver to the Depositor, the Issuer, the Seller and each Rating Agency an
interim certification in substantially the form attached hereto as Exhibit A-2,
within 90 days after the Closing Date (or, with respect to any document
delivered after the Startup Day, within 45 days of receipt and with respect to
any Qualified Substitute Mortgage, within five Business Days after the
assignment thereof) that, as to each Mortgage Loan listed in the Mortgage Loan
Schedule (other than any Mortgage Loan paid in full or any Mortgage Loan
specifically identified in the exception report annexed thereto as not being
covered by such certification), (i) all documents required to be reviewed by it
pursuant to Section 2.01 of this Agreement are in its possession, (ii) such
documents have been reviewed by it and have not been mutilated, damaged or torn
and relate to such Mortgage Loan and (iii) based on its examination and only as
to the foregoing, the information set forth in the Mortgage Loan Schedule that
corresponds to items (i), (ii), (iii), (xiii), (xiv) and (xviii) of the Mortgage
Loan Schedule accurately reflects information set forth in the Mortgage File. It
is herein acknowledged that, in conducting such review, the Indenture Trustee is
under no duty or obligation to inspect, review or examine any such documents,
instruments, certificates or other papers to determine that they are genuine,
valid, enforceable, sufficient, nor shall the Indenture Trustee have any
responsibility to determine the perfection or priority of any instrument
appropriate for the represented purpose or that they have actually been
recorded, are in recordable form sufficient to be recorded, or that they are
other than what they purport to be on their face.

         No later than 180 days after the Closing Date, the Indenture Trustee
shall deliver to the Depositor, the Issuer and the Seller a final certification
in the form annexed hereto as Exhibit A-3 evidencing the completeness of the
Mortgage Files, with any applicable exceptions noted thereon.

         If, in the process of reviewing the Mortgage Files and making or
preparing, as the case may be, the certifications referred to above, the
Indenture Trustee finds any document or documents constituting a part of a
Mortgage File to be missing or not conforming to the

                                       33
<PAGE>
requirements as specifically set forth herein, at the conclusion of its review
the Indenture Trustee (or the Custodian as its designated agent) shall promptly
notify the Seller, the Depositor, the Issuer and the Master Servicer. In
addition, upon the discovery by the Seller or the Depositor (or upon receipt by
the Indenture Trustee of written notification of such breach) of a breach of any
of the representations and warranties made by the Seller in the Mortgage Loan
Purchase Agreement in respect of any Mortgage Loan that materially adversely
affects such Mortgage Loan or the interests of the related Securityholders in
such Mortgage Loan, the party discovering such breach shall give prompt written
notice to the other parties to this Agreement.

         Nothing in this Agreement shall be construed to constitute an
assumption by the Trust Estate, the Indenture Trustee, any Custodian or the
Noteholders of any unsatisfied duty, claim or other liability on any Mortgage
Loan or to any Mortgagor.

         Upon execution of this Agreement, the Depositor hereby delivers to the
Indenture Trustee and the Indenture Trustee acknowledges a receipt of the
Mortgage Loan Purchase Agreement and each Servicing Agreement.

         Section 2.03 Grant Clause.

         (a) It is intended that the conveyance by the Depositor to the Issuer
of the Mortgage Loans and other assets in the Trust Estate, as provided for in
Section 2.01 be construed as a sale by the Depositor to the Issuer of the
Mortgage Loans and other assets in the Trust Estate for the benefit of the
Securityholders. Further, it is not intended that any such conveyance be deemed
to be a pledge of the Mortgage Loans and other assets in the Trust Estate by the
Depositor to the Issuer to secure a debt or other obligation of the Depositor.
However, in the event that the Mortgage Loans and other assets in the Trust
Estate are held to be property of the Depositor or if for any reason this
Agreement is held or deemed to create a security interest in the Mortgage Loans
and other assets in the Trust Estate, then it is intended that (a) this
Agreement shall also be deemed to be a security agreement within the meaning of
Articles 8 and 9 of the New York UCC (or the Relevant UCC if not the New York
UCC); (b) the conveyances provided for in Section 2.01 shall be deemed to be (1)
a grant by the Depositor to the Issuer of a security interest in all of the
Depositor's right (including the power to convey title thereto), title and
interest, whether now owned or hereafter acquired, in and to (A) the Mortgage
Loans, including the Mortgage Notes, the Mortgages, any related insurance
policies and all other documents in the related Mortgage Files, (B) all amounts
payable pursuant to the Mortgage Loans in accordance with the terms thereof and
(C) any and all general intangibles consisting of, arising from or relating to
any of the foregoing, and all proceeds of the conversion, voluntary or
involuntary, of the foregoing into cash, instruments, securities or other
property, including without limitation all Liquidation Proceeds, all Insurance
Proceeds, all amounts from time to time held or invested in the Collection
Account, the Certificate Account, the Note Account, whether in the form of cash,
instruments, securities or other property and (2) an assignment by the Depositor
to the Issuer of any security interest in any and all of the Depositor's right
(including the power to convey title thereto), title and interest, whether now
owned or hereafter acquired, in and to the property described in the foregoing
clauses (1)(A) through (C); (c) the possession by the Indenture Trustee or any
other agent of the Issuer of Mortgage Notes, and such other items of property as
constitute instruments, money, negotiable documents or chattel paper shall be
deemed to be

                                       34
<PAGE>

"possession by the secured party," or possession by a purchaser or a person
designated by such secured party, for purposes of perfecting the security
interest pursuant to the New York UCC and any other Relevant UCC (including,
without limitation, Section 9-313, 8-313 or 8-321 thereof); and (d)
notifications to persons holding such property, and acknowledgments, receipts or
confirmations from persons holding such property, shall be deemed notifications
to, or acknowledgments, receipts or confirmations from, financial
intermediaries, bailees or agents (as applicable) of the Issuer for the purpose
of perfecting such security interest under applicable law.

         (b) The Depositor and, at the Depositor's direction, the Seller and the
Issuer shall, to the extent consistent with this Agreement, take such reasonable
actions as may be necessary to ensure that, if this Agreement were deemed to
create a security interest in the Mortgage Loans and the other property of the
Trust Estate, such security interest would be deemed to be a perfected security
interest of first priority under applicable law and will be maintained as such
throughout the term of this Agreement. Without limiting the generality of the
foregoing, the Depositor shall prepare and deliver to the Issuer, and the Issuer
shall forward for filing, or shall cause to be forwarded for filing, at the
expense of the Depositor, all filings necessary to maintain the effectiveness of
any original filings necessary under the Relevant UCC to perfect the Issuer's
security interest in or lien on the Mortgage Loans as evidenced by an Officer's
Certificate of the Depositor, including without limitation (x) continuation
statements, and (y) such other statements as may be occasioned by (1) any change
of name of the Seller, the Depositor or the Issuer, (2) any change of location
of the place of business or the chief executive office of the Seller or the
Depositor or (3) any transfer of any interest of the Seller or the Depositor in
any Mortgage Loan.

(c) Neither the Depositor nor the Issuer shall organize under the law of any
jurisdiction other than the State under which each is organized as of the
Closing Date (whether changing its jurisdiction of organization or organizing
under an additional jurisdiction) without giving 30 days prior written notice of
such action to its immediate transferee, including the Indenture Trustee. Before
effecting such change, each of the Depositor or the Issuer proposing to change
its jurisdiction of organization shall prepare and file in the appropriate
filing office any financing statements or other statements necessary to continue
the perfection of the interests of its immediate transferees, including the
Indenture Trustee, in the Mortgage Loans. In connection with the transactions
contemplated by this Agreement and the Indenture, each of the Depositor and the
Issuer authorizes its immediate transferee, including the Indenture Trustee, to
file in any filing office any initial financing statements, any amendments to
financing statements, any continuation statements, or any other statements or
filings described in this Section 2.03(b).

                                  ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

         Section 3.01 Representations and Warranties of the Depositor.

         The Depositor hereby represents and warrants to the Master Servicer,
the Issuer, the Owner Trustee and the Indenture Trustee, for the benefit of
Securityholders, as follows:

                                       35
<PAGE>

                  (i) this Agreement constitutes a legal, valid and binding
         obligation of the Depositor, enforceable against the Depositor in
         accordance with its terms, except as enforceability may be limited by
         applicable bankruptcy, insolvency, reorganization, moratorium or other
         similar laws now or hereafter in effect affecting the enforcement of
         creditors' rights in general an except as such enforceability may be
         limited by general principles of equity (whether considered in a
         proceeding at law or in equity);

                  (ii) immediately prior to the sale and assignment by the
         Depositor to the Issuer of each Mortgage Loan, the Depositor had good
         and marketable title to each Mortgage Loan (insofar as such title was
         conveyed to it by the Seller) subject to no prior lien, claim,
         participation interest, mortgage, security interest, pledge, charge or
         other encumbrance or other interest of any nature;

                  (iii) as of the Closing Date, the Depositor has transferred
         all right, title and interest in the Mortgage Loans to the Indenture
         Trustee on behalf of the Issuer;

                  (iv) the Depositor has not transferred the Mortgage Loans to
         the Indenture Trustee on behalf of the Issuer with any intent to
         hinder, delay or defraud any of its creditors;

                  (v) the Depositor has been duly incorporated and is validly
         existing as a corporation in good standing under the laws of Delaware,
         with full corporate power and authority to own its assets and conduct
         its business as presently being conducted;

                  (vi) the Depositor is not in violation of its certificate of
         incorporation or by-laws or in default in the performance or observance
         of any material obligation, agreement, covenant or condition contained
         in any contract, indenture, mortgage, loan agreement, note, lease or
         other instrument to which the Depositor is a party or by which it or
         its properties may be bound, which default might result in any material
         adverse changes in the financial condition, earnings, affairs or
         business of the Depositor or which might materially and adversely
         affect the properties or assets, taken as a whole, of the Depositor;

                  (vii) the execution, delivery and performance of this
         Agreement by the Depositor, and the consummation of the transactions
         contemplated hereby, do not and will not result in a material breach or
         violation of any of the terms or provisions of, or, to the knowledge of
         the Depositor, constitute a default under, any indenture, mortgage,
         deed of trust, loan agreement or other agreement or instrument to which
         the Depositor is a party or by which the Depositor is bound or to which
         any of the property or assets of the Depositor is subject, nor will
         such actions result in any violation of the provisions of the
         certificate of incorporation or by-laws of the Depositor or, to the
         best of the Depositor's knowledge without independent investigation,
         any statute or any order, rule or regulation of any court or
         governmental agency or body having jurisdiction over the Depositor or
         any of its properties or assets (except for such conflicts, breaches,
         violations and defaults as would not have a material adverse effect on
         the ability of the Depositor to perform its obligations under this
         Agreement);

                                       36
<PAGE>

                  (viii) to the best of the Depositor's knowledge without any
         independent investigation, no consent, approval, authorization, order,
         registration or qualification of or with any court or governmental
         agency or body of the United States or any other jurisdiction is
         required for the issuance of the Notes and Trust Certificates, or the
         consummation by the Depositor of the other transactions contemplated by
         this Agreement, except such consents, approvals, authorizations,
         registrations or qualifications as (a) may be required under State
         securities or "blue sky" laws, (b) have been previously obtained or (c)
         the failure of which to obtain would not have a material adverse effect
         on the performance by the Depositor of its obligations under, or the
         validity or enforceability of, this Agreement; and

                  (ix) there are no actions, proceedings or investigations
         pending before or, to the Depositor's knowledge, threatened by any
         court, administrative agency or other tribunal to which the Depositor
         is a party or of which any of its properties is the subject: (a) which
         if determined adversely to the Depositor would have a material adverse
         effect on the business, results of operations or financial condition of
         the Depositor; (b) asserting the invalidity of this Agreement, the
         Notes or the Trust Certificates; (c) seeking to prevent the issuance of
         the Notes or the Trust Certificates or the consummation by the
         Depositor of any of the transactions contemplated by this Agreement, as
         the case may be; or (d) which might materially and adversely affect the
         performance by the Depositor of its obligations under, or the validity
         or enforceability of, this Agreement.

         (b) Except as set forth in Section 3.01(ii), the Depositor shall have
no obligation or liability with respect to any breach of any representation or
warranty with respect to the Mortgage Loans under any circumstances.

         (c) It is understood and agreed that the representations and warranties
of the Depositor set forth in this Section 3.01 shall survive the execution and
delivery of this Agreement. The Depositor shall indemnify the Master Servicer,
the Indenture Trustee, the Owner Trustee, the Seller and the Issuer and hold
each of the Master Servicer, the Indenture Trustee, the Owner Trustee, the
Seller and the Issuer harmless against any loss, damages, penalties, fines,
forfeitures, legal fees and related costs, judgments, and other costs and
expenses resulting from any claim, demand, defense or assertion based on or
grounded upon, or resulting from, a breach of the Depositor's representations
and warranties contained in this Section 3.01 hereof. It is understood and
agreed that the enforcement of the obligation of the Depositor set forth in this
Section to indemnify the Master Servicer, the Indenture Trustee, the Owner
Trustee, the Seller and the Issuer as provided in this Section constitutes the
sole remedy of the Master Servicer, the Seller, the Indenture Trustee, the Owner
Trustee and the Issuer respecting a breach by the Depositor of the
representations and warranties in this Section 3.01.

         Any cause of action against the Depositor relating to or arising out of
the breach of the representations and warranties made in this Section 3.01 shall
accrue upon discovery of such breach by the Seller, the Issuer, the Master
Servicer or the Indenture Trustee.

         Section 3.02 Representations and Warranties of the Master Servicer. (a)
The Master Servicer hereby represents and warrants to the Depositor, the Issuer,
the Seller, the Owner Trustee and the Indenture Trustee, for the benefit of the
Securityholders, as follows:

                                       37
<PAGE>

                  (i) it is validly existing and in good standing under the laws
         of the United States of America as a national banking association, and
         as Master Servicer has full power and authority to transact any and all
         business contemplated by this Agreement and to execute, deliver and
         comply with its obligations under the terms of this Agreement, the
         execution, delivery and performance of which have been duly authorized
         by all necessary corporate action on the part of the Master Servicer;

                  (ii) the execution and delivery of this Agreement by the
         Master Servicer and its performance and compliance with the terms of
         this Agreement will not (A) violate the Master Servicer's charter or
         bylaws, (B) violate any law or regulation or any administrative decree
         or order to which it is subject or (C) constitute a default (or an
         event which, with notice or lapse of time, or both, would constitute a
         default) under, or result in the breach of, any material contract,
         agreement or other instrument to which the Master Servicer is a party
         or by which it is bound or to which any of its assets are subject,
         which violation, default or breach would materially and adversely
         affect the Master Servicer's ability to perform its obligations under
         this Agreement;

                  (iii) this Agreement constitutes, assuming due authorization,
         execution and delivery hereof by the other respective parties hereto, a
         legal, valid and binding obligation of the Master Servicer, enforceable
         against it in accordance with the terms hereof, except as such
         enforcement may be limited by bankruptcy, insolvency, reorganization,
         moratorium and other laws affecting the enforcement of creditors'
         rights in general, and by general equity principles (regardless of
         whether such enforcement is considered in a proceeding in equity or at
         law);

                  (iv) the Master Servicer is not in default with respect to any
         order or decree of any court or any order or regulation of any federal,
         state, municipal or governmental agency to the extent that any such
         default would materially and adversely affect its performance
         hereunder;

                  (v) the Master Servicer is not a party to or bound by any
         agreement or instrument or subject to any charter provision, bylaw or
         any other corporate restriction or any judgment, order, writ,
         injunction, decree, law or regulation that may materially and adversely
         affect its ability as Master Servicer to perform its obligations under
         this Agreement or that requires the consent of any third person to the
         execution of this Agreement or the performance by the Master Servicer
         of its obligations under this Agreement;

                  (vi) no litigation is pending or, to the best of the Master
         Servicer's knowledge, threatened against the Master Servicer which
         would prohibit its entering into this Agreement or performing its
         obligations under this Agreement;

                  (vii) the Master Servicer, or an affiliate thereof the primary
         business of which is the servicing of conventional residential mortgage
         loans, is a Fannie Mae- or Freddie Mac-approved seller/servicer;

                                       38
<PAGE>

                  (viii) no consent, approval, authorization or order of any
         court or governmental agency or body is required for the execution,
         delivery and performance by the Master Servicer of or compliance by the
         Master Servicer with this Agreement or the consummation of the
         transactions contemplated by this Agreement, except for such consents,
         approvals, authorizations and orders (if any) as have been obtained;

                  (ix) the consummation of the transactions contemplated by this
         Agreement are in the ordinary course of business of the Master
         Servicer;

                  (x) the Master Servicer has obtained an errors and omissions
         insurance policy and a fidelity bond in accordance with Section 4.03
         each of which is in full force and effect, and each of which provides
         at least such coverage as is required hereunder; and

                  (xi) the information about the Master Servicer under the
         heading "The Master Servicer" in the Offering Documents relating to the
         Master Servicer does not include an untrue statement of a material fact
         and does not omit to state a material fact, with respect to the
         statements made, necessary in order to make the statements in light of
         the circumstances under which they were made not misleading.

         (b) It is understood and agreed that the representations and warranties
set forth in this Section 3.02 shall survive the execution and delivery of this
Agreement. The Master Servicer shall indemnify the Depositor, the Issuer, the
Owner Trustee, the Seller and the Indenture Trustee and hold them harmless
against any loss, damages, penalties, fines, forfeitures, legal fees and related
costs, judgments, and other costs and expenses resulting from any claim, demand,
defense or assertion based on or grounded upon, or resulting from, a breach of
the Master Servicer's representations and warranties contained in Section
3.02(a). It is understood and agreed that the enforcement of the obligation of
the Master Servicer set forth in this Section to indemnify the Depositor, the
Issuer, the Owner Trustee, the Seller and the Indenture Trustee as provided in
this Section constitutes the sole remedy (other than as set forth in Section
6.01) of the Depositor, the Issuer, the Seller, the Owner Trustee and the
Indenture Trustee, respecting a breach of the foregoing representations and
warranties. Such indemnification shall survive any termination of the Master
Servicer as Master Servicer hereunder, and any termination of this Agreement.

         Any cause of action against the Master Servicer relating to or arising
out of the breach of any representations and warranties made in this Section
shall accrue upon discovery of such breach by the Depositor, the Master
Servicer, the Indenture Trustee, the Seller or the Issuer or notice thereof by
any one of such parties to the other parties.

         Section 3.03 Repurchase or Substitution of Mortgage Loans by Seller.

         (a) It is understood and agreed that the representations and warranties
(i) set forth in Section 3.01 and (ii) of the Seller set forth in the Mortgage
Loan Purchase Agreement and assigned to the Issuer by the Depositor hereunder
shall be pledged by the Issuer to the Indenture Trustee under the Indenture and
shall each survive delivery of the Mortgage Files and the Assignment of each
Mortgage Loan to the Indenture Trustee and shall continue throughout the term of
this Agreement. Upon discovery or receipt of written notice that a document does
not

                                       39
<PAGE>

comply with the requirements of Section 2.01, or that a document is missing
from, a Mortgage File or upon actual knowledge or receipt of written notice of
the breach by the Seller of any representation, warranty or covenant under the
Mortgage Loan Purchase Agreement or in Section 3.04 or Section 3.05 hereof in
respect of any Mortgage Loan which materially adversely affects the value of
that Mortgage Loan or the interest therein of the Securityholders, the Indenture
Trustee (or the Custodian as its designated agent) shall promptly notify the
Seller of such noncompliance, missing document or breach and request that the
Seller deliver such missing document or cure such noncompliance or breach within
90 days from the date that the Seller was notified of such missing document,
noncompliance or breach, and if the Seller does not deliver such missing
document or cure such noncompliance or breach in all material respects during
such period, the Indenture Trustee shall enforce the Seller's obligation under
the Mortgage Loan Purchase Agreement and cause the Seller to repurchase that
Mortgage Loan from the Trust Estate at the Purchase Price on or prior to the
Determination Date following the expiration of such 90 day period; provided,
however, that, in connection with any such breach that could not reasonably have
been cured within such 90 day period, if the Seller shall have commenced to cure
such breach within such 90 day period, the Seller shall be permitted to proceed
thereafter diligently and expeditiously to cure the same within the additional
period provided under the Mortgage Loan Purchase Agreement; and, provided
further, that, in the case of the breach of any representation, warranty or
covenant made by the Seller in Schedule III to the Mortgage Loan Purchase
Agreement, the Seller shall be obligated to cure such breach or purchase the
affected Mortgage Loans for the Purchase Price or, if the Mortgage Loan or the
related Mortgaged Property acquired with respect thereto has been sold, then the
Seller shall pay, in lieu of the Purchase Price, any excess of the Purchase
Price over the Net Liquidation Proceeds received upon such sale. The Purchase
Price for the repurchased Mortgage Loan or such other amount due shall be
deposited in the Collection Account on or prior to the next Determination Date
after the Seller's obligation to repurchase such Mortgage Loan arises. The
Indenture Trustee, upon receipt of written certification in the form of Exhibit
B hereto from the Master Servicer of the related deposit in the Collection
Account, shall release to the Seller the related Mortgage File and shall execute
and deliver such instruments of transfer or assignment, in each case without
recourse, as the Seller shall furnish to it and as shall be necessary to vest in
the Seller any Mortgage Loan released pursuant hereto and the Indenture and the
Indenture Trustee shall have no further responsibility with regard to such
Mortgage File (it being understood that the Indenture Trustee shall have no
responsibility for determining the sufficiency of such assignment for its
intended purpose). In lieu of repurchasing any such Mortgage Loan as provided
above, the Seller may cause such Mortgage Loan to be removed from the Trust
Estate (in which case it shall become a Deleted Mortgage Loan) and substitute
one or more Qualified Substitute Mortgage Loans in the manner and subject to the
limitations set forth in Section 3.03(d) below. It is understood and agreed that
the obligation of the Seller to cure or to repurchase (or to substitute for) any
Mortgage Loan as to which a document is missing, a material defect in a
constituent document exists or as to which such a breach has occurred and is
continuing shall constitute the sole remedy against the Seller respecting such
omission, defect or breach available to the Indenture Trustee on behalf of the
Securityholders.

         The Indenture Trustee shall enforce the obligations of the Seller under
the Mortgage Loan Purchase Agreement including, without limitation, any
obligation of the Seller to purchase

                                       40
<PAGE>

a Mortgage Loan on account of missing or defective documentation or on account
of a breach of a representation, warranty or covenant as described in this
Section 3.03(a).

         (b) If pursuant to the provisions of Section 3.03(a), the Seller
repurchases or otherwise removes from the Trust Estate a Mortgage Loan that is a
MERS Mortgage Loan, the Seller will take (or shall cause the applicable Servicer
to take), at the expense of the Seller (with the cooperation of the Depositor,
the Indenture Trustee and the Master Servicer), such actions as are necessary
either (i) cause MERS to execute and deliver an Assignment of Mortgage in
recordable form to transfer the Mortgage from MERS to the Seller and shall cause
such Mortgage to be removed from registration on the MERS(R) System in
accordance with MERS' rules and regulations or (ii) cause MERS to designate on
the MERS(R) System the Seller or its designee as the beneficial holder of such
Mortgage Loan.

         (c) [Reserved].

         (d) Any substitution of Qualified Substitute Mortgage Loans for Deleted
Mortgage Loans made pursuant to Section 3.03(a) above must be effected prior to
the last Business Day that is within two years after the Closing Date. As to any
Deleted Mortgage Loan for which the Seller substitutes a Qualified Substitute
Mortgage Loan or Loans, such substitution shall be effected by the Seller
delivering to the Indenture Trustee, for such Qualified Substitute Mortgage Loan
or Loans, the Mortgage Note, the Mortgage, the Assignment to the Indenture
Trustee, and such other documents and agreements, with all necessary
endorsements thereon, as are required by Section 2.01 hereof, together with an
Officers' Certificate stating that each such Qualified Substitute Mortgage Loan
satisfies the definition thereof and specifying the Substitution Amount (as
described below), if any, in connection with such substitution; provided,
however, that, in the case of any Qualified Substitute Mortgage Loan that is a
MERS Mortgage Loan, the Seller shall provide such documents and take such other
action with respect to such Qualified Substitute Mortgage Loans as are required
pursuant to Section 2.01 hereof. The Indenture Trustee shall acknowledge receipt
of such Qualified Substitute Mortgage Loan or Loans and, within five Business
Days thereafter, shall review such documents as specified in Section 2.02 hereof
and deliver with respect to such Qualified Substitute Mortgage Loan or Loans, a
certification substantially in the form attached hereto as Exhibit A-2, with any
exceptions noted thereon. Within 180 days of the date of substitution, the
Indenture Trustee shall deliver to the Seller and the Master Servicer a
certification substantially in the form of Exhibit A-3 hereto with respect to
such Qualified Substitute Mortgage Loan or Loans, with any exceptions noted
thereon. Monthly Payments due with respect to Qualified Substitute Mortgage
Loans in the month of substitution are not part of the Trust Estate and will be
retained by the Seller. For the month of substitution, payments to
Securityholders will reflect the collections and recoveries in respect of such
Deleted Mortgage Loan in the Due Period preceding the month of substitution and
the Depositor or the Seller, as the case may be, shall thereafter be entitled to
retain all amounts subsequently received in respect of such Deleted Mortgage
Loan. The Seller shall give or cause to be given written notice to the
Securityholders that such substitution has taken place, shall amend the Mortgage
Loan Schedule to reflect the removal of such Deleted Mortgage Loan from the
terms of this Agreement and the substitution of the Qualified Substitute
Mortgage Loan or Loans and shall deliver a copy of such amended Mortgage Loan
Schedule to the Indenture Trustee. Upon such substitution, such Qualified
Substitute Mortgage Loan or Loans shall constitute part of the Trust

                                       41
<PAGE>

Estate and shall be subject in all respects to the terms of this Agreement and,
in the case of a substitution effected by the Seller, the Mortgage Loan Purchase
Agreement, including, in the case of a substitution effected by the Seller all
representations and warranties thereof included in the Mortgage Loan Purchase
Agreement and all representations and warranties thereof set forth in Section
3.04 hereof, in each case as of the date of substitution.

         For any month in which the Seller substitutes one or more Qualified
Substitute Mortgage Loans for one or more Deleted Mortgage Loans, the Seller
shall determine, and provide written certification to the Indenture Trustee and
the Depositor as to, the amount (each, a "Substitution Amount"), if any, by
which the aggregate Purchase Price of all such Deleted Mortgage Loans exceeds
the aggregate, as to each such Qualified Substitute Mortgage Loan, of the
principal balance thereof as of the date of substitution, together with one
month's interest on such principal balance at the applicable Net Mortgage Rate.
On or prior to the next Determination Date after the Seller's obligation to
repurchase the related Deleted Mortgage Loan arises, the Seller will deliver or
cause to be delivered to the Indenture Trustee for deposit in the Collection
Account an amount equal to the related Substitution Amount, if any, and the
Indenture Trustee, upon receipt of the related Qualified Substitute Mortgage
Loan or Loans, shall release to the Seller the related Mortgage File or Files
and shall execute and deliver such instruments of transfer or assignment, in
each case without recourse, as the Seller shall deliver to it and as shall be
necessary to vest therein any Deleted Mortgage Loan released pursuant hereto.

         Section 3.04 Representations and Warranties of the Seller with Respect
to the Mortgage Loans.

         The Seller hereby represents and warrants to the Issuer and the
Indenture Trustee for the benefit of the Securityholders that the
representations and warranties made by the Seller pursuant to Schedule III to
the Mortgage Loan Purchase Agreement are hereby being made to the Issuer and the
Indenture Trustee and are true and correct on the Closing Date.

         With respect to the representations and warranties incorporated in this
Section 3.04 that are made to the best of the Seller's knowledge or as to which
the Seller has no knowledge, if it is discovered by the Depositor, the Issuer,
the Seller or the Indenture Trustee that the substance of such representation
and warranty is inaccurate and such inaccuracy materially and adversely affects
the value of the related Mortgage Loan or the interest therein of the
Securityholders then, notwithstanding the Seller's lack of knowledge with
respect to the substance of such representation and warranty being inaccurate at
the time the representation or warranty was made, such inaccuracy shall be
deemed a breach of the applicable representation or warranty.

         Within 90 days of its discovery or its receipt of notice of any such
missing or materially defective documentation or any such breach of a
representation or warranty, the Seller shall promptly deliver such missing
document or cure such defect or breach in all material respects or, in the event
such defect or breach cannot be cured, the Seller shall repurchase the affected
Mortgage Loan or cause the removal of such Mortgage Loan from the Trust Estate
and substitute for it one or more Qualified Substitute Mortgage Loans, in either
case, in accordance with Section 3.03 hereof.

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<PAGE>

         It is understood and agreed that the representations and warranties
incorporated in this Section 3.04 shall survive delivery of the Mortgage Files
to the Indenture Trustee and shall inure to the benefit of the Securityholders
notwithstanding any restrictive or qualified endorsement or assignment. Upon
discovery by any of the Depositor, the Seller, the Issuer or the Indenture
Trustee of a breach of any of the foregoing representations and warranties which
materially and adversely affects the value of any Mortgage Loan or the interests
therein of the Securityholders, the party discovering such breach shall give
prompt written notice to the other parties, and in no event later than two
Business Days from the date of such discovery. It is understood and agreed that
the obligations of the Seller set forth in Section 3.03(a) hereof to cure,
substitute for or repurchase a related Mortgage Loan pursuant to the Mortgage
Loan Purchase Agreement constitute the sole remedies available to the
Securityholders or to the Indenture Trustee on their behalf respecting a breach
of the representations and warranties incorporated in this Section 3.04.

         Section 3.05 Representations and Warranties of the Seller.

         The Seller hereby represents and warrants to the Issuer and the
Indenture Trustee on behalf of the Securityholders that, as of the Closing Date
or as of such date specifically provided herein:

                  (i) the Seller is duly organized, validly existing and in good
         standing as a corporation under the laws of the State of Delaware and
         is and will remain in compliance with the laws of each state in which
         any Mortgaged Property is located to the extent necessary to fulfill
         its obligations hereunder;

                  (ii) the Seller has the power and authority to hold each
         Mortgage Loan, to sell each Mortgage Loan, to execute, deliver and
         perform, and to enter into and consummate, all transactions
         contemplated by this Agreement. The Seller has duly authorized the
         execution, delivery and performance of this Agreement, has duly
         executed and delivered this Agreement and this Agreement, assuming due
         authorization, execution and delivery by the other parties hereto,
         constitutes a legal, valid and binding obligation of the Seller,
         enforceable against it in accordance with its terms except as the
         enforceability thereof may be limited by bankruptcy, insolvency or
         reorganization or other similar laws in relation to the rights of
         creditors generally;

                  (iii) the execution and delivery of this Agreement by the
         Seller and the performance of and compliance with the terms of this
         Agreement will not violate the Seller's articles of incorporation or
         by-laws or constitute a default under or result in a material breach or
         acceleration of, any material contract, agreement or other instrument
         to which the Seller is a party or which may be applicable to the Seller
         or its assets;

                  (iv) the Seller is not in violation of, and the execution and
         delivery of this Agreement by the Seller and its performance and
         compliance with the terms of this Agreement will not constitute a
         violation with respect to, any order or decree of any court or any
         order or regulation of any federal, state, municipal or governmental
         agency having jurisdiction over the Seller or its assets, which
         violation might have consequences that would materially and adversely
         affect the condition (financial or otherwise) or the

                                       43
<PAGE>

         operation of the Seller or its assets or might have consequences that
         would materially and adversely affect the performance of its
         obligations and duties hereunder;

                  (v) the Seller does not believe, nor does it have any reason
         or cause to believe, that it cannot perform each and every covenant
         contained in this Agreement;

                  (vi) the Seller has good, marketable and indefeasible title to
         the Mortgage Loans, free and clear of any and all liens, pledges,
         charges or security interests of any nature encumbering the Mortgage
         Loans and upon the payment of the purchase price under the Mortgage
         Loan Purchase Agreement by the Depositor, the Depositor will have good
         and marketable title to the Mortgage Notes and Mortgage Loans, free and
         clear of all liens or encumbrances;

                  (vii) the Mortgage Loans are not being transferred by the
         Seller with any intent to hinder, delay or defraud any creditors of the
         Seller;

                  (viii) there are no actions or proceedings against, or
         investigations known to it of, the Seller before any court,
         administrative or other tribunal (A) that might prohibit its entering
         into this Agreement, (B) seeking to prevent the sale of the Mortgage
         Loans or the consummation of the transactions contemplated by this
         Agreement or (C) that might prohibit or materially and adversely affect
         the performance by the Seller of its obligations under, or validity or
         enforceability of, this Agreement;

                  (ix) no consent, approval, authorization or order of any court
         or governmental agency or body is required for the execution, delivery
         and performance by the Seller of, or compliance by the Seller with,
         this Agreement or the consummation of the transactions contemplated by
         this Agreement, except for such consents, approvals, authorizations or
         orders, if any, that have been obtained; and

                  (x) the consummation of the transactions contemplated by this
         Agreement are in the ordinary course of business of the Seller, and the
         transfer, assignment and conveyance of the Mortgage Notes and the
         Mortgages by the Seller pursuant to the Mortgage Loan Purchase
         Agreement are not subject to the bulk transfer or any similar statutory
         provisions.

         Section 3.06 Covenants of the Seller.

         The Seller hereby covenants that, except for the transfer under the
Mortgage Loan Purchase Agreement or hereunder, the Seller will not sell, pledge,
assign or transfer to any other Person, or grant, create, incur, assume or
suffer to exist any lien on any Mortgage Loan, or any interest therein; the
Seller will notify the Indenture Trustee, as assignee of the Depositor and the
Issuer, and the Master Servicer of the existence of any lien on any Mortgage
Loan immediately upon discovery thereof, and the Seller will defend the right,
title and interest of the Issuer, as assignee of the Depositor, in, to and under
the Mortgage Loans, against all claims of third parties claiming through or
under the Seller; provided, however, that nothing in this Section 3.06 shall
prevent or be deemed to prohibit the Seller from suffering to exist upon any of
the Mortgage Loans any liens for municipal or other local taxes and other
governmental charges if such taxes

                                       44
<PAGE>

or governmental charges shall not at the time be due and payable or if the
Seller shall currently be contesting the validity thereof in good faith by
appropriate proceedings and shall have set aside on its books adequate reserves
with respect thereto.

                                   ARTICLE IV

                 ADMINISTRATION AND SERVICING OF MORTGAGE LOANS
                             BY THE MASTER SERVICER

         Section 4.01 Master Servicer to Service and Administer the Mortgage
Loans.

         The Master Servicer shall supervise, monitor and oversee the obligation
of the Servicers to service and administer their respective Mortgage Loans in
accordance with the terms of the applicable Servicing Agreement and, where
applicable, the Correspondent Sellers Guide and the Master Servicing Guide, and
shall have full power and authority to do any and all things which it may deem
necessary or desirable in connection with such master servicing and
administration. In performing its obligations hereunder, the Master Servicer
shall act in a manner consistent with Accepted Master Servicing Practices and,
where applicable, the Master Servicing Guide. Furthermore, the Master Servicer
shall oversee and consult with each Servicer as necessary from time-to-time to
carry out the Master Servicer's obligations hereunder, shall receive, review and
evaluate all reports, information and other data provided to the Master Servicer
by each Servicer and shall cause each Servicer to perform and observe the
covenants, obligations and conditions to be performed or observed by such
Servicer under the applicable Servicing Agreement. The Master Servicer shall
independently and separately monitor each Servicer's servicing activities with
respect to each related Mortgage Loan, reconcile the results of such monitoring
with such information provided in the previous sentence on a monthly basis and
coordinate corrective adjustments to the Servicers' and Master Servicer's
records, and based on such reconciled and corrected information, prepare the
statements specified in Section 5.10 and any other information and statements
required hereunder. The Master Servicer shall reconcile the results of its
Mortgage Loan monitoring with the actual remittances of the Servicers to the
related Servicing Accounts pursuant to the applicable Servicing Agreements.

         The Indenture Trustee shall furnish the Servicers and the Master
Servicer with any limited powers of attorney and other documents in form
acceptable to the Indenture Trustee, necessary or appropriate to enable the
Servicers and the Master Servicer to service and administer the related Mortgage
Loans and REO Property, which limited powers of attorney shall provide that the
Indenture Trustee will not be liable for the actions or omissions of the
Servicers or Master Servicer in exercising such powers.

         The Indenture Trustee shall provide access to the records and
documentation in possession of the Indenture Trustee (including in its capacity
as Custodian hereunder) regarding the related Mortgage Loans and REO Property
and the servicing thereof to the Securityholders, the FDIC, and the supervisory
agents and examiners of the FDIC, such access being afforded only upon
reasonable prior written request and during normal business hours at the office
of the Indenture Trustee; provided, however, that, unless otherwise required by
law, the Indenture Trustee shall not be required to provide access to such
records and documentation if the provision thereof would, in the Indenture
Trustee's reasonable judgment, violate the legal right

                                       45
<PAGE>

to privacy of any Mortgagor. The Indenture Trustee shall allow representatives
of the above entities to photocopy any of the records and documentation and
shall provide equipment for that purpose at a charge that covers the Indenture
Trustee's actual costs.

         The Indenture Trustee shall execute (but not prepare) and deliver to
the related Servicer and the Master Servicer any court pleadings, requests for
trustee's sale or other documents necessary or desirable to (i) the foreclosure
or trustee's sale with respect to a Mortgaged Property; (ii) any legal action
brought to obtain judgment against any Mortgagor on the Mortgage Note or
Mortgage; (iii) obtain a deficiency judgment against the Mortgagor; or (iv)
enforce any other rights or remedies provided by the Mortgage Note or Mortgage
or otherwise available at law or equity.

         Section 4.02 Monitoring of Servicers.

         (a) The Master Servicer shall be responsible for reporting to the
Indenture Trustee (on behalf of the Issuer) and the Depositor the compliance by
each Servicer with its duties under the related Servicing Agreement. In the
review of each Servicer's activities, the Master Servicer may rely upon an
officer's certificate of the Servicer with regard to such Servicer's compliance
with the terms of its Servicing Agreement. In the event that the Master
Servicer, in its judgment, determines that a Servicer should be terminated in
accordance with its Servicing Agreement, or that a notice should be sent
pursuant to such Servicing Agreement with respect to the occurrence of an event
that, unless cured, would constitute grounds for such termination, the Master
Servicer shall notify the Depositor and the Indenture Trustee thereof and the
Master Servicer shall issue such notice or take such other action as it deems
appropriate.

         (b) The Master Servicer, for the benefit of the Issuer and the
Securityholders, shall enforce the obligations of each Servicer under the
related Servicing Agreement, and shall, in the event that a Servicer fails to
perform its obligations in accordance with the related Servicing Agreement,
subject to the preceding paragraph, terminate the rights and obligations of such
Servicer thereunder and act as servicer of the related Mortgage Loans or enter
into a new Servicing Agreement with a successor Servicer selected by the Master
Servicer which the Master Servicer shall cause the Indenture Trustee to
acknowledge; provided, however, it is understood and acknowledged by the parties
hereto that there will be a period of transition (not to exceed 90 days) before
the actual servicing functions can be fully transferred to such successor
Servicer. Such enforcement, including, without limitation, the legal prosecution
of claims, termination of Servicing Agreements and the pursuit of other
appropriate remedies, shall be in such form and carried out to such an extent
and at such time as the Master Servicer, in its good faith business judgment,
would require were it the owner of the related Mortgage Loans. The Master
Servicer shall pay the costs of such enforcement at its own expense, provided
that the Master Servicer shall not be required to prosecute or defend any legal
action except to the extent that the Master Servicer shall have received
reasonable indemnity for its costs and expenses in pursuing such action.

         (c) To the extent that the costs and expenses of the Master Servicer
related to any termination of a Servicer, appointment of a successor Servicer or
the transfer and assumption of servicing by the Master Servicer with respect to
any Servicing Agreement (including, without limitation, (i) all legal costs and
expenses and all due diligence costs and expenses associated

                                       46
<PAGE>

with an evaluation of the potential termination of the Servicer as a result of
an event of default by such Servicer and (ii) all costs and expenses associated
with the complete transfer of servicing, including all servicing files and all
servicing data and the completion, correction or manipulation of such servicing
data as may be required by the successor servicer to correct any errors or
insufficiencies in the servicing data or otherwise to enable the successor
service to service the Mortgage Loans in accordance with the related Servicing
Agreement) are not fully and timely reimbursed by the terminated Servicer, the
Master Servicer shall be entitled to reimbursement of such costs and expenses
from the Collection Account.

         (d) The Master Servicer shall require each Servicer to comply with the
remittance requirements and other obligations set forth in the related Servicing
Agreement.

         (e) If the Master Servicer acts as Servicer, it will not assume
liability for the representations and warranties of the Servicer, if any, that
it replaces.

         (f) With respect to Additional Collateral Mortgage Loans, the Master
Servicer shall have no duty or obligation to supervise, monitor or oversee the
activities of each Servicer under its Servicing Agreement with respect to
Additional Collateral or either Guaranty Surety Bond, except (a) with respect to
any instances where a Servicer, in the course of fulfilling its obligations
under the related Servicing Agreement seeks directions, instructions, consents
or waivers from the Master Servicer with respect to any item of Additional
Collateral, or (b) upon the occurrence of the following events (i) in the case
of a final liquidation of any Mortgaged Property secured by Additional
Collateral, the Master Servicer shall enforce the obligation of the Servicer
under the related Servicing Agreement to liquidate such Additional Collateral as
required by such Servicing Agreement, and (ii) if the Master Servicer assumes
the obligations of such Servicer as successor Servicer under the related
Servicing Agreement pursuant to this Section 4.02, as successor Servicer, it
shall be bound to service and administer the Additional Collateral and the
related Guaranty Surety Bond in accordance with the provisions of such Servicing
Agreement.

         Section 4.03 Fidelity Bond.

         The Master Servicer, at its expense, shall maintain in effect a blanket
fidelity bond and an errors and omissions insurance policy, affording coverage
with respect to all directors, officers, employees and other Persons acting on
such Master Servicer's behalf, and covering errors and omissions in the
performance of the Master Servicer's obligations hereunder. The errors and
omissions insurance policy and the fidelity bond shall be in such form and
amount generally acceptable for entities serving as master servicers or
trustees.

         Section 4.04 Power to Act; Procedures. The Master Servicer shall master
service the Mortgage Loans and shall have full power and authority, subject to
the provisions of this Agreement, to do any and all things that it may deem
necessary or desirable in connection with the master servicing and
administration of the Mortgage Loans, including but not limited to the power and
authority (i) to execute and deliver, on behalf of the Securityholders and the
Indenture Trustee, customary consents or waivers and other instruments and
documents, (ii) to consent to transfers of any Mortgaged Property and
assumptions of the Mortgage Notes and related Mortgages, (iii) to collect any
Insurance Proceeds and Liquidation Proceeds, and (iv) to

                                       47
<PAGE>

effectuate, in its own name, on behalf the Indenture Trustee, or in the name of
the Indenture Trustee, foreclosure or other conversion of the ownership of the
Mortgaged Property securing any Mortgage Loan, in each case, in accordance with
the provisions of this Agreement and the related Servicing Agreement, as
applicable; provided, however, that the Master Servicer shall not (and,
consistent with its responsibilities under Section 4.02, shall not permit any
Servicer to) knowingly or intentionally take any action, or fail to take (or
fail to cause to be taken) any action that is inconsistent with or prejudices
the interests of the Issuer or the Securityholders in any Mortgage Loan or the
rights and interests of the Depositor, the Indenture Trustee, the Issuer and the
Securityholders under this Agreement and the Indenture. The Master Servicer
shall represent and protect the interests of the Issuer and the Securityholders
in the same manner as it protects its own interests in mortgage loans in its own
portfolio in any claim, proceeding or litigation regarding a Mortgage Loan. The
Indenture Trustee shall furnish the Master Servicer, upon written request from a
Servicing Officer, with any limited powers of attorney empowering the Master
Servicer or any Servicer to execute and deliver instruments of satisfaction or
cancellation, or of partial or full release or discharge, and to foreclose upon
or otherwise liquidate Mortgaged Property, and to appeal, prosecute or defend in
any court action relating to the Mortgage Loans or the Mortgaged Property, in
accordance with the applicable Servicing Agreement and this Agreement, and the
Indenture Trustee shall execute and deliver such other documents, as the Master
Servicer may request, to enable the Master Servicer to master service and
administer the Mortgage Loans and carry out its duties hereunder, in each case
in accordance with Accepted Master Servicing Practices (and the Indenture
Trustee shall have no liability for misuse of any such powers of attorney by the
Master Servicer or any Servicer). In instituting foreclosures or similar
proceedings, the Master Servicer shall institute such proceedings either in its
own name on behalf of the Indenture Trustee or in the name of the Indenture
Trustee (or cause the related Servicer, pursuant to the related Servicing
Agreement, to institute such proceedings either in the name of such Servicer on
behalf of the Indenture Trustee or in the name of the Indenture Trustee), unless
otherwise required by law or otherwise appropriate. If the Master Servicer or
the Indenture Trustee has been advised that it is likely that the laws of the
state in which action is to be taken prohibit such action if taken in the name
of the Indenture Trustee or the Indenture Trustee on its behalf or the Issuer,
as applicable, would be adversely affected under the "doing business" or tax
laws of such state if such action is taken in its name, the Master Servicer
shall join with the Indenture Trustee, in the appointment of a co-trustee
pursuant to Section 6.10 of the Indenture. In the performance of its duties
hereunder, the Master Servicer shall be an independent contractor and shall not,
except in those instances where it is taking action in the name of the Indenture
Trustee, be deemed to be the agent of the Indenture Trustee. Under no
circumstance shall the Indenture Trustee have any responsibility or liability
for the Master Servicer's actions or omissions in instances in which the Master
Servicer is taking action in the name of the Indenture Trustee.

         Section 4.05 Due-on-Sale Clauses; Assumption Agreement.

         To the extent provided in the applicable Servicing Agreement and to the
extent Mortgage Loans contain enforceable due-on-sale clauses, the Master
Servicer shall cause the Servicers to enforce such clauses in accordance with
the applicable Servicing Agreement. If applicable law prohibits the enforcement
of a due-on-sale clause or such clause is otherwise not enforced in accordance
with the applicable Servicing Agreement, and, as a consequence, a Mortgage Loan
is

                                       48
<PAGE>

assumed, the original Mortgagor may be released from liability in accordance
with the applicable Servicing Agreement.

         Section 4.06 Release of Mortgage Files. (a) Upon (i) becoming aware of
the payment in full of any Mortgage Loan or (ii) the receipt by the Master
Servicer of a notification that payment in full has been or will be escrowed in
a manner customary for such purposes, the Master Servicer will, or will cause
the related Servicer to, promptly notify the Indenture Trustee (or the
applicable Custodian) by a certification substantially in the form of Exhibit B
hereto signed by a Servicing Officer or in a mutually agreeable electronic
format which will, in lieu of a signature on its face, originate from a
Servicing Officer (which certification shall include a statement to the effect
that all amounts received in connection with such payment that are required to
be deposited in the related Servicing Account maintained by the applicable
Servicer pursuant to Section 5.01 or by the applicable Servicer pursuant to its
Servicing Agreement have been or will be so deposited) and shall request that
the Indenture Trustee (or the Custodian, on behalf of the Indenture Trustee)
deliver to the applicable Servicer the related Mortgage File. Upon receipt of
such certification and request, the Indenture Trustee (or the Custodian, on
behalf of the Indenture Trustee), shall promptly release the related Mortgage
File to the applicable Servicer and the Indenture Trustee (and the Custodian, if
applicable) shall have no further responsibility with regard to such Mortgage
File. Upon any such payment in full, each Servicer is authorized, to give, as
agent for the Indenture Trustee, as the mortgagee under the Mortgage that
secured the Mortgage Loan, an instrument of satisfaction (or assignment of
mortgage without recourse) regarding the Mortgaged Property subject to the
Mortgage, which instrument of satisfaction or assignment, as the case may be,
shall be delivered to the Person or Persons entitled thereto against receipt
therefor of such payment, it being understood and agreed that no expenses
incurred in connection with such instrument of satisfaction or assignment, as
the case may be, shall be chargeable to the related Servicing Account.

         (b) From time to time and as appropriate for the servicing or
foreclosure of any Mortgage Loan and in accordance with the applicable Servicing
Agreement, the Indenture Trustee shall execute such documents as shall be
prepared and furnished to the Indenture Trustee by a Servicer or the Master
Servicer (in form reasonably acceptable to the Indenture Trustee) and as are
necessary to the prosecution of any such proceedings. The Indenture Trustee (or
the Custodian, on behalf of the Indenture Trustee) shall, upon the request of a
Servicer or the Master Servicer, and delivery to the Indenture Trustee (or the
Custodian, on behalf of the Indenture Trustee) of one copy of a request for
release signed by a Servicing Officer substantially in the form of Exhibit B (or
in a mutually agreeable electronic format which will, in lieu of a signature on
its face, originate from a Servicing Officer), release the related Mortgage File
held in its possession or control to the Servicer or the Master Servicer, as
applicable. Such trust receipt shall obligate the Servicer or the Master
Servicer to return the Mortgage File to the Indenture Trustee (or the Custodian
on behalf of the Indenture Trustee) when the need therefor by the Servicer or
the Master Servicer no longer exists (as determined by such Servicer or the
Master Servicer, as applicable) unless the Mortgage Loan shall be liquidated, in
which case, upon receipt of a certificate of a Servicing Officer similar to that
hereinabove specified, the Mortgage File shall be released by the Indenture
Trustee (or the Custodian on behalf of the Indenture Trustee), to the Servicer
or the Master Servicer.

                                       49
<PAGE>

         Section 4.07 Documents, Records and Funds in Possession of Master
Servicer To Be Held for Indenture Trustee.

         (a) The Master Servicer shall transmit and each Servicer (to the extent
required by the related Servicing Agreement) shall transmit to the Indenture
Trustee (or Custodian) such documents and instruments coming into the possession
of the Master Servicer or such Servicer from time to time as are required by the
terms hereof, or in the case of the Servicers, the applicable Servicing
Agreement, to be delivered to the Indenture Trustee (or Custodian). Any funds
received by the Master Servicer or by a Servicer in respect of any Mortgage Loan
or which otherwise are collected by the Master Servicer or by a Servicer as
Liquidation Proceeds or Insurance Proceeds in respect of any Mortgage Loan shall
be held for the benefit of the Indenture Trustee and the Securityholders subject
to the Master Servicer's right to retain or withdraw from the Collection Account
the Master Servicing Fee, any additional compensation pursuant to Section 4.12
and any other amounts provided in this Agreement, and to the right of each
Servicer to retain its Servicing Fee and any other amounts as provided in the
applicable Servicing Agreement. The Master Servicer shall, and (to the extent
provided in the applicable Servicing Agreement) shall cause each Servicer to,
provide access to information and documentation regarding the Mortgage Loans to
the Indenture Trustee, its agents and accountants at any time upon reasonable
request and during normal business hours, and to Securityholders that are
savings and loan associations, banks or insurance companies, the Office of
Thrift Supervision, the FDIC and the supervisory agents and examiners of such
Office and Corporation or examiners of any other federal or state banking or
insurance regulatory authority if so required by applicable regulations of the
Office of Thrift Supervision or other regulatory authority, such access to be
afforded without charge but only upon reasonable request in writing and during
normal business hours at the offices of the Master Servicer designated by it. In
fulfilling such a request the Master Servicer shall not be responsible for
determining the sufficiency of such information.

         (b) All Mortgage Files and funds collected or held by, or under the
control of, the Master Servicer, in respect of any Mortgage Loans, whether from
the collection of principal and interest payments or from Liquidation Proceeds
or Insurance Proceeds, shall be held by the Master Servicer for and on behalf of
the Indenture Trustee and the Securityholders and shall be and remain the sole
and exclusive property of the Issuer; provided, however, that the Master
Servicer and each Servicer shall be entitled to setoff against, and deduct from,
any such funds any amounts that are properly due and payable to the Master
Servicer or such Servicer under this Agreement or the applicable Servicing
Agreement.

         Section 4.08 Standard Hazard Insurance and Flood Insurance Policies.

         (a) For each Mortgage Loan (other than a Cooperative Loan), the Master
Servicer shall enforce any obligation of the Servicers under the related
Servicing Agreements to maintain or cause to be maintained standard fire and
casualty insurance and, where applicable, flood insurance, all in accordance
with the provisions of the related Servicing Agreements. It is understood and
agreed that such insurance shall be with insurers meeting the eligibility
requirements set forth in the applicable Servicing Agreement and that no
earthquake or other additional insurance is to be required of any Mortgagor or
to be maintained on property acquired

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<PAGE>

in respect of a defaulted loan, other than pursuant to such applicable laws and
regulations as shall at any time be in force and as shall require such
additional insurance.

         (b) Pursuant to Section 5.01 and 5.02, any amounts collected by the
Servicers or the Master Servicer, or by any Servicer, under any insurance
policies (other than amounts to be applied to the restoration or repair of the
property subject to the related Mortgage or released to the Mortgagor in
accordance with the applicable Servicing Agreement) shall be deposited into the
Collection Account, subject to withdrawal pursuant to Section 5.02 and 5.03. Any
cost incurred by the Master Servicer or any Servicer in maintaining any such
insurance if the Mortgagor defaults in its obligation to do so shall be added to
the amount owing under the Mortgage Loan where the terms of the Mortgage Loan so
permit; provided, however, that the addition of any such cost shall not be taken
into account for purposes of calculating the distributions to be made to
Securityholders and shall be recoverable by the Master Servicer or such Servicer
pursuant to Section 5.02 and 5.03.

         Section 4.09 Maintenance of the Primary Insurance Policies.

         (a) The Master Servicer shall not take, or permit any Servicer (to the
extent such action is prohibited under the applicable Servicing Agreement) to
take, any action that would result in noncoverage under any applicable Primary
Insurance Policy of any loss which, but for the actions of such Master Servicer
or Servicer, would have been covered thereunder. The Master Servicer shall use
its best reasonable efforts to cause each Servicer (to the extent required under
the related Servicing Agreement) to keep in force and effect (to the extent that
the Mortgage Loan requires the Mortgagor to maintain such insurance), primary
mortgage insurance applicable to each Mortgage Loan (including any lender-paid
Primary Insurance Policy) in accordance with the provisions of this Agreement
and the related Servicing Agreement, as applicable. The Master Servicer shall
not, and shall not permit any Servicer (to the extent required under the related
Servicing Agreement) to, cancel or refuse to renew any such Primary Insurance
Policy that is in effect at the date of the initial issuance of the Mortgage
Note and is required to be kept in force hereunder except in accordance with the
provisions of this Agreement and the related Servicing Agreement, as applicable.

         (b) The Master Servicer agrees to cause each Servicer (to the extent
required under the related Servicing Agreement) to present, on behalf of the
Indenture Trustee, the Issuer and the Securityholders, claims to the insurer
under any Primary Insurance Policies and, in this regard, to take such
reasonable action as shall be necessary to permit recovery under any Primary
Insurance Policies respecting defaulted Mortgage Loans. Pursuant to Section 5.01
and 5.02, any amounts collected by the Servicer under any Primary Insurance
Policies shall be deposited in the Collection Account, subject to withdrawal
pursuant to Section 5.03.

         Section 4.10 Indenture Trustee to Retain Possession of Certain
Insurance Policies and Documents.

         The Indenture Trustee (or the Custodian, as directed by the Indenture
Trustee), shall retain possession and custody of the originals (to the extent
available) of any Primary Insurance Policies, or certificate of insurance if
applicable, and any certificates of renewal as to the foregoing as may be issued
from time to time as contemplated by this Agreement. Until all

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<PAGE>

amounts distributable in respect of the Notes have been distributed in full and
the Master Servicer otherwise has fulfilled its obligations under this
Agreement, the Indenture Trustee (or its Custodian, if any, as directed by the
Indenture Trustee) shall also retain possession and custody of each Mortgage
File in accordance with and subject to the terms and conditions of this
Agreement. The Master Servicer shall promptly deliver or cause to be delivered
to the Indenture Trustee (or the Custodian, as directed by the Indenture
Trustee), upon the execution or receipt thereof the originals of any Primary
Insurance Policies, any certificates of renewal, and such other documents or
instruments that constitute portions of the Mortgage File that come into the
possession of the Master Servicer from time to time.

         Section 4.11 Realization Upon Defaulted Mortgage Loans.

         The Master Servicer shall cause each Servicer (to the extent required
under the related Servicing Agreement) to foreclose upon, repossess or otherwise
comparably convert the ownership of Mortgaged Properties securing such of the
Mortgage Loans as come into and continue in default and as to which no
satisfactory arrangements can be made for collection of delinquent payments, all
in accordance with the applicable Servicing Agreement.

         Section 4.12 Compensation to the Master Servicer.

         All income and gain realized from any investment of funds in the
Collection Account shall be for the benefit of the Master Servicer as additional
compensation. Servicing compensation in the form of assumption fees, if any,
late payment charges, as collected, if any, or otherwise (but not including any
Prepayment Penalty Amounts) shall be retained by the applicable Servicer, or the
Master Servicer, and shall not be deposited in the related Servicing Account or
Collection Account. The Master Servicer shall be required to pay all expenses
incurred by it in connection with its activities hereunder and shall not be
entitled to reimbursement therefor except as provided in this Agreement. The
amount of the aggregate compensation payable as set forth in this Section 4.12
plus the Master Servicing Fee due to the Master Servicer in respect of any
Payment Date shall be reduced in accordance with Section 5.12.

         Section 4.13 REO Property.

         (a) In the event the Issuer acquires ownership of any REO Property in
respect of any Mortgage Loan, the deed or certificate of sale shall be issued to
the Indenture Trustee, or to its nominee, on behalf of the Securityholders. The
Master Servicer shall use its reasonable best efforts to sell, or cause the
applicable Servicer, to the extent provided in the applicable Servicing
Agreement to sell any REO Property as expeditiously as possible and in
accordance with the provisions of this Agreement and the related Servicing
Agreement, as applicable. Pursuant to its efforts to sell such REO Property, the
Master Servicer shall protect and conserve, or cause the applicable Servicer to
protect and conserve, such REO Property in the manner and to such extent
required by the applicable Servicing Agreement.

         (b) The Master Servicer shall deposit or cause to be deposited all
funds collected and received by it, or recovered from any Servicer, in
connection with the operation of any REO Property in the Collection Account.

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<PAGE>

         (c) The Master Servicer and each Servicer, upon the final disposition
of any REO Property, shall be entitled to reimbursement for any related
unreimbursed Advances and other unreimbursed advances as well as any unpaid
Master Servicing Fees or Servicing Fees from Liquidation Proceeds received in
connection with the final disposition of such REO Property; provided, that any
such unreimbursed Advances as well as any unpaid Master Servicing Fees or
Servicing Fees may be reimbursed or paid, as the case may be, prior to final
disposition, out of any net rental income or other net amounts derived from such
REO Property.

         (d) The Liquidation Proceeds from the final disposition of the REO
Property, net of any payment to the Master Servicer and the applicable Servicer
as provided above, shall be deposited in the Collection Account on or prior to
the Determination Date in the month following receipt thereof (and the Master
Servicer shall provide prompt written notice to the Indenture Trustee upon such
deposit) and be remitted by wire transfer in immediately available funds to the
Indenture Trustee for deposit into the Note Account on the next succeeding
Master Servicer Remittance Date.

         Section 4.14 Annual Officer's Certificate as to Compliance.

         (a) The Master Servicer shall deliver to the Issuer, the Indenture
Trustee and each Rating Agency on or before March 1 of each year, commencing in
March, 2004, an Officer's Certificate, certifying that with respect to the
period ending December 31 of the prior year: (i) such Servicing Officer has
reviewed the activities of such Master Servicer during the preceding calendar
year or portion thereof and its performance under this Agreement, (ii) to the
best of such Servicing Officer's knowledge, based on such review, such Master
Servicer has performed and fulfilled its duties, responsibilities and
obligations under this Agreement in all material respects throughout such year,
or, if there has been a default in the fulfillment of any such duties,
responsibilities or obligations, specifying each such default known to such
Servicing Officer and the nature and status thereof, (iii) nothing has come to
the attention of such Servicing Officer to lead such Servicing Officer to
believe that any Servicer has failed to perform any of its duties,
responsibilities and obligations under its Servicing Agreement in all material
respects throughout such year, or, if there has been a material default in the
performance or fulfillment of any such duties, responsibilities or obligations,
specifying each such default known to such Servicing Officer and the nature and
status thereof.

         (b) Copies of such statements shall be provided to any Securityholder
upon request, by the Master Servicer or by the Indenture Trustee at the Master
Servicer's expense if the Master Servicer failed to provide such copies (unless
(i) the Master Servicer shall have failed to provide the Indenture Trustee with
such statement or (ii) the Indenture Trustee shall be unaware of the Master
Servicer's failure to provide such statement).

         Section 4.15 Annual Independent Accountant's Servicing Report.

         If the Master Servicer has, during the course of any fiscal year,
directly serviced any of the Mortgage Loans, then the Master Servicer at its
expense shall cause a nationally recognized firm of independent certified public
accountants to furnish a statement to the Issuer, the Indenture Trustee, the
Rating Agencies and the Depositor on or before March 1 of each year, commencing
on March 1, 2004 to the effect that, with respect to the most recently ended
fiscal

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<PAGE>

year, such firm has examined certain records and documents relating to the
Master Servicer's performance of its servicing obligations under this Agreement
and servicing and trust agreements in material respects similar to this
Agreement and to each other and that, on the basis of such examination conducted
substantially in compliance with the audit program for mortgages serviced for
Freddie Mac or the Uniform Single Attestation Program for Mortgage Bankers, such
firm is of the opinion that the Master Servicer's activities have been conducted
in compliance with this Agreement, or that such examination has disclosed no
material items of noncompliance except for (i) such exceptions as such firm
believes to be immaterial, (ii) such other exceptions as are set forth in such
statement and (iii) such exceptions that the Uniform Single Attestation Program
for Mortgage Bankers or the Audit Program for Mortgages Serviced by Freddie Mac
requires it to report. Copies of such statements shall be provided to any
Securityholder upon request by the Master Servicer, or by the Indenture Trustee
at the expense of the Master Servicer if the Master Servicer shall fail to
provide such copies. If such report discloses exceptions that are material, the
Master Servicer shall advise the Issuer and the Indenture Trustee whether such
exceptions have been or are susceptible of cure, and will take prompt action to
do so.

         Section 4.16 Reports Filed with Securities and Exchange Commission.

         Within 15 days after each Payment Date, the Master Servicer shall, in
accordance with industry standards, file with the Commission via the Electronic
Data Gathering and Retrieval System ("EDGAR"), a Form 8-K with a copy of the
Payment Date Statement as an exhibit thereto. Prior to January 30, 2004, the
Master Servicer shall, in accordance with industry standards, file a Form 15
Suspension Notice with respect to the Issuer, if applicable. Prior to (i) March
31, 2004 and (ii) unless and until a Form 15 Suspension Notice shall have been
filed, prior to March 31 of each year thereafter, the Master Servicer shall
provide a Master Servicer Certification, together with a copy of the annual
independent accountant's servicing report and annual statement of compliance of
each Servicer, in each case, required to be delivered pursuant to its Servicing
Agreement, and, if applicable, the annual independent accountant's servicing
report and annual statement of compliance to be delivered by the Master Servicer
pursuant to Section 4.15. Prior to (i) March 31, 2004 and (ii) unless and until
a Form 15 Suspension Notice shall have been filed, March 31 of each year
thereafter, the Master Servicer shall file a Form 10-K, in substance conforming
to industry standards, with respect to the Issuer. Such Form 10-K shall include
the Master Servicer Certification and other documentation provided by the Master
Servicer pursuant to the second preceding sentence. The Depositor hereby grants
to the Master Servicer a limited power of attorney to execute and file each such
document on behalf of the Depositor. Such power of attorney shall continue until
either the earlier of (i) receipt by the Master Servicer from the Depositor of
written termination of such power of attorney and (ii) the termination of the
Issuer. The Depositor agrees to promptly furnish to the Master Servicer, from
time to time upon request, such further information, reports and financial
statements within its control related to this Agreement and the Mortgage Loans
as the Master Servicer reasonably deems appropriate to prepare and file all
necessary reports with the Commission. The Master Servicer shall have no
responsibility to file any items other than those specified in this Section
4.16; provided, however, the Master Servicer will cooperate with the Depositor
in connection with any additional filings with respect to the Issuer as the
Depositor deems necessary under the Securities Exchange Act of 1934, as amended
(the "Exchange Act"). Copies of all reports filed by the Master Servicer under
the Exchange Act shall be sent to the Depositor and the Issuer.

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<PAGE>

Fees and expenses incurred by the Master Servicer in connection with this
Section 4.16 shall not be reimbursable by the Issuer or from the Trust Estate.

         Section 4.17 Amendments to Master Servicing Guide and Correspondent
Sellers Guide.

         The Seller and the Master Servicer hereby agree not to amend the Master
Servicing Guide or the Correspondent Sellers Guide with respect to the Mortgage
Loans (which are Securitized Loans (as defined therein)) which amendment would
(i) change the Servicer Remittance Date or date for remittance of any servicer
reports or monthly remittance advices, (ii) change the manner in which any
Servicer makes Advances, servicing advances or amounts to compensate for
Prepayment Interest Shortfalls or (iii) otherwise have a material adverse effect
on the Indenture Trustee or the Securityholders unless such changes are made
pursuant to the provisions of Section 8.03 hereof.

         Section 4.18 Optional or Required Purchase of Certain Mortgage Loans.

         (a) Thornburg, in its capacity as a Servicer of a substantial portion
of the Mortgage Loans, shall have the right to purchase from the Issuer any
Mortgage Loan which as of the first day of a calendar quarter is delinquent in
payment by 90 days or more or is an REO Property, at a price equal to the
Purchase Price; provided however (i) that such Mortgage Loan is still 90 days or
more delinquent or is an REO Property as of the date of such purchase and (ii)
this purchase option, if not theretofore exercised, shall terminate on the date
prior to the last day of the related calendar quarter. This purchase option, if
not exercised, shall not be thereafter reinstated unless the delinquency is
cured and the Mortgage Loan thereafter again becomes 90 days or more delinquent
or becomes an REO Property, in which case the option shall again become
exercisable as of the first day of the related calendar quarter.

         (b) In addition, Thornburg, in its capacity as the Seller, may, but is
not required to, repurchase any Mortgage Loan as to which the Mortgagor has
requested a Significant Modification and such Mortgagor has a satisfactory
payment history under such Mortgage Loan and meets the credit standards of the
Seller for the loan program selected (a "Significant Modification Loan"). A
"Significant Modification" shall mean any modification to the interest rate of
the greater of (i) 0.25% added or subtracted from the existing rate and (ii) a
change equal to the product of (a) 5% and (b) the annual existing interest rate
thereon, which is not provided for in the related Mortgage Note. The purchase
price for any repurchase pursuant to this Section 4.18 shall be the applicable
Purchase Price. In order to exercise its repurchase rights hereunder, the Seller
shall deliver to the Master Servicer and the Indenture Trustee an Officer's
Certificate identifying the Mortgage Loan to be repurchased and certifying that
(i) such Mortgage Loan is a Significant Modification Loan, and (ii) that the
Significant Modification Loan will be entered into on the date of such
repurchase.

         (c) No later than the fourth Business Day prior to each Payment Date,
Thornburg will provide to the Master Servicer a list identifying all Mortgage
Loans that became Converted Mortgage Loans or Modified Mortgage Loans during the
related Due Period. On the third Business Day prior to each Payment Date,
provided that it has received such list from Thornburg, the Master Servicer
shall prepare and provide to TMI a Converted Mortgage Loan Schedule and a
Modified Mortgage Loan Schedule with respect to such Due Period. No later

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<PAGE>

than 1:00 PM Eastern Time on the second Business Day prior to each Payment Date,
TMI shall purchase each Converted Mortgage Loan and Modified Mortgage Loan, to
the extent specified in a Converted Mortgage Loan Schedule or Modified Mortgage
Loan Schedule delivered to it by the Master Servicer for such Payment Date, at
the applicable Purchase Price for each such Converted Mortgage Loan or Modified
Mortgage Loan, as applicable, and shall remit such Purchase Price to the Master
Servicer for deposit in the Collection Account.

         (d) If at any time Thornburg or TMI remits to the Master Servicer a
payment for deposit in the Collection Account covering the amount of the
Purchase Price for a Mortgage Loan of the type set forth in clauses (a), (b) or
(c) above, as applicable, and Thornburg or TMI, as applicable, provides to the
Indenture Trustee a certification signed by a Servicing Officer stating that the
amount of such payment has been deposited in the Collection Account, then the
Indenture Trustee shall execute the assignment of such Mortgage Loan at the
request of Thornburg or TMI, without recourse to Thornburg or TMI, as
applicable, which shall succeed to all the Issuer's and/or the Indenture
Trustee's right, title and interest in and to such Mortgage Loan, and all
security and documents relative thereto. Such assignment shall be an assignment
outright and not for security. Thornburg or TMI, as applicable, will thereupon
own such Mortgage Loan, and all such security and documents, free of the lien of
the Indenture and of any further obligation to the Issuer, the Indenture Trustee
or the Securityholders with respect thereto.

         Section 4.19 Closing Certificate and Opinion.

         On or before the Closing Date, the Master Servicer shall cause to be
delivered to the Depositor, the Seller, the Indenture Trustee, and Lehman
Brothers Inc. an Opinion of Counsel, dated the Closing Date, in form and
substance reasonably satisfactory to the Depositor, Lehman Brothers Inc., and
the Seller as to the due authorization, execution and delivery of this Agreement
by the Master Servicer and the enforceability thereof.

         Section 4.20 Liabilities of the Master Servicer.

         The Master Servicer shall be liable in accordance herewith only to the
extent of the obligations specifically imposed upon and undertaken by it herein.

         Section 4.21 Merger or Consolidation of the Master Servicer.

         (a) The Master Servicer will keep in full force and effect its
existence, rights and franchises as a corporation under the laws of the state of
its incorporation, and will obtain and preserve its qualification to do business
as a foreign corporation in each jurisdiction in which such qualification is or
shall be necessary to protect the validity and enforceability of this Agreement,
the Securities or any of the Mortgage Loans and to perform its duties under this
Agreement.

         (b) Any Person into which the Master Servicer may be merged or
consolidated, or any corporation resulting from any merger or consolidation to
which the Master Servicer shall be a party, or any Person succeeding to the
business of the Master Servicer, shall be the successor of the Master Servicer
hereunder, without the execution or filing of any paper or further act on the
part of any of the parties hereto, anything herein to the contrary
notwithstanding.

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<PAGE>

         Section 4.22 Indemnification of the Indemnified Persons.

         (a) The Master Servicer agrees to indemnify the Indemnified Persons
(other than the Master Servicer) for, and to hold them harmless against, any
loss, liability or expense (except as otherwise provided herein with respect to
expenses) (including reasonable legal fees and disbursements of counsel)
incurred on their part that may be sustained in connection with, arising out of,
or relating to this Agreement or the Securities (i) related to the Master
Servicer's failure to perform its duties in compliance with this Agreement
(except as any such loss, liability or expense shall be otherwise reimbursable
pursuant to this Agreement, excluding Subsection (b) below) or (ii) incurred by
reason of the Master Servicer's willful misfeasance, bad faith or gross
negligence in the performance of duties hereunder or by reason of reckless
disregard of obligations and duties hereunder, provided, in each case, that with
respect to any such claim or legal action (or pending or threatened claim or
legal action), an Indemnified Person shall have given the Master Servicer and
the Depositor written notice thereof promptly after such Indemnified Person
shall have with respect to such claim or legal action knowledge thereof. The
Indemnified Person's failure to give such notice shall not affect the
Indemnified Person's right to indemnification hereunder. This indemnity shall
survive the resignation or removal of the Indenture Trustee or the Master
Servicer and the termination of this Agreement.

         (b) The Issuer will indemnify any Indemnified Person for any loss,
liability or expense of any Indemnified Person not otherwise indemnified by the
Master Servicer that is referred to in Subsection (a) above.

         (c) In addition to its obligations under Section 4.22(a), the Master
Servicer agrees to indemnify the Indemnified Persons (other than the Master
Servicer) for, and to hold them harmless against, any loss, liability or expense
(except as otherwise provided herein with respect to expenses) (including
reasonable legal fees and disbursements of counsel) incurred on their part (i)
in connection with, arising out of, or relating to the Master Servicer's failure
to file a Form 10-K in accordance with Section 4.16, (ii) by reason of the
Master Servicer's willful misfeasance, bad faith or gross negligence in the
performance of such obligations pursuant to Section 4.16 or (iii) by reason of
the Master Servicer's reckless disregard of such obligations pursuant to Section
4.16, provided, in each case, that with respect to any such claim or legal
action (or pending or threatened claim or legal action), an Indemnified Person
shall have given the Master Servicer written notice thereof promptly after such
Indemnified Person shall have with respect to such claim or legal action
knowledge thereof. The Indemnified Person's failure to give such notice shall
not affect the Indemnified Person's right to indemnification hereunder. This
indemnity shall survive the resignation or removal of the Indenture Trustee or
the Master Servicer and the termination of this Agreement.

         Section 4.23 Limitations on Liability of the Master Servicer and
Others.

         Subject to the obligation of the Master Servicer to indemnify the
Indemnified Persons pursuant to Section 4.22:

         (a) Neither the Master Servicer nor any of the directors, officers,
employees or agents of the Master Servicer shall be under any liability to the
Indemnified Persons, the Issuer or the Securityholders for taking any action or
for refraining from taking any action in good faith

                                       57
<PAGE>

pursuant to this Agreement, or for errors in judgment; provided, however, that
this provision shall not protect the Master Servicer or any such Person against
any breach of warranties or representations made herein or any liability which
would otherwise be imposed by reason of such Person's willful misfeasance, bad
faith or gross negligence in the performance of duties or by reason of reckless
disregard of obligations and duties hereunder.

         (b) The Master Servicer and any director, officer, employee or agent of
the Master Servicer may rely in good faith on any document of any kind prima
facie properly executed and submitted by any Person respecting any matters
arising hereunder.

         (c) The Master Servicer, the Indenture Trustee, the Administrator, the
Custodian (including for such purpose, the Indenture Trustee acting in its
capacity as Custodian) and any director, officer, employee or agent of the
Master Servicer, the Indenture Trustee, the Administrator, or the Custodian
shall be indemnified by the Issuer and held harmless thereby against any loss,
liability or expense (except as otherwise provided herein with respect to
expenses) (including reasonable legal fees and disbursements of counsel)
incurred on their part that may be sustained in connection with, arising out of,
or relating to, this Agreement, the Securities or any Servicing Agreement or the
transactions contemplated hereby or thereby (except with respect to the Master
Servicer only, to the extent that the Master Servicer is indemnified by the
Servicer thereunder), other than (i) with respect to the Master Servicer or
Custodian only, any such loss, liability or expense related to the Master
Servicer's failure to perform its duties in compliance with this Agreement or,
if applicable, with respect to the Custodian only, any such loss, liability or
expense related to the Custodian's failure to perform its duties under this
Agreement, or (ii) with respect to the Master Servicer or Custodian, as
applicable, only, any such loss, liability or expense incurred by reason of the
Master Servicer's or the Custodian's, as applicable, willful misfeasance, bad
faith or gross negligence in the performance of its duties hereunder or by
reason of its reckless disregard of obligations and duties hereunder or under a
custodial agreement.

         (d) The Master Servicer shall not be under any obligation to appear in,
prosecute or defend any legal action that is not incidental to its duties under
this Agreement and that in its opinion may involve it in any expense or
liability; provided, however, the Master Servicer may in its discretion,
undertake any such action which it may deem necessary or desirable with respect
to this Agreement and the rights and duties of the parties hereto and the
interests of the Issuer and the Securityholders hereunder. In such event, the
legal expenses and costs of such action and any liability resulting therefrom
shall be expenses, costs and liabilities of the Issuer, and the Master Servicer
shall be entitled to be reimbursed therefor out of the Collection Account as
provided by Section 5.02. Nothing in this Subsection 4.23(d) shall affect the
Master Servicer's obligation to supervise, or to take such actions as are
necessary to ensure, the servicing and administration of the Mortgage Loans
pursuant to Subsection 4.01(a).

         (e) In taking or recommending any course of action pursuant to this
Agreement, unless specifically required to do so pursuant to this Agreement, the
Master Servicer shall not be required to investigate or make recommendations
concerning potential liabilities which the Issuer might incur as a result of
such course of action by reason of the condition of the

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<PAGE>

Mortgaged Properties but shall give notice to the Indenture Trustee if it has
notice of such potential liabilities.

         (f) The Master Servicer shall not be liable for any acts or omissions
of any Servicer, except as otherwise expressly provided herein.

         Section 4.24 Master Servicer Not to Resign.

         Except as provided in Section 4.26, the Master Servicer shall not
resign from the obligations and duties hereby imposed on it except upon a
determination by it that any such duties hereunder are no longer permissible
under applicable law or are in material conflict by reason of applicable law
with any other activities carried on by it and such impermissibility or conflict
cannot be cured. Any such determination permitting the resignation of the Master
Servicer shall be evidenced by an Independent Opinion of Counsel (delivered at
the expense of the Master Servicer) to such effect delivered to the Issuer and
the Indenture Trustee. No such resignation by the Master Servicer shall become
effective until the Indenture Trustee or a successor to the Master Servicer
reasonably satisfactory to the Issuer and the Indenture Trustee shall have
assumed the responsibilities and obligations of the Master Servicer in
accordance with Section 6.02 hereof. The Indenture Trustee shall notify each
Rating Agency of the resignation of the Master Servicer.

         Section 4.25 Successor Master Servicer.

         In connection with the appointment of any successor master servicer or
the assumption of the duties of the Master Servicer, the Indenture Trustee may
make such arrangements for the compensation of such successor master servicer
out of payments on the Mortgage Loans as the Indenture Trustee and such
successor master servicer shall agree which in no case shall exceed the Master
Servicing Fee. If the successor master servicer does not agree that the proposed
compensation is fair, such successor master servicer shall obtain two quotations
of market compensation from third parties actively engaged in the servicing of
single-family mortgage loans; provided, however, that Thornburg, as a Servicer
of a substantial portion of the Mortgage Loans, shall have the right, but not
the obligation, to be appointed successor master servicer in the event that the
Indenture Trustee, in its sole discretion, decides not to assume the duties of
the Master Servicer itself; and provided, further, that each Rating Agency shall
confirm in writing that any appointment of a successor Master Servicer (other
than the Indenture Trustee) will not result in a downgrade in the then current
rating of any Class of Notes.

         Section 4.26 Sale and Assignment of Master Servicing.

         The Master Servicer may sell and assign its rights and delegate its
duties and obligations in their entirety as Master Servicer under this
Agreement, with the written consent of Thornburg in its capacity as a Servicer
of a substantial portion of the Mortgage Loans, to be given in its sole
discretion, and provided further that: (i) the purchaser or transferee accepting
such assignment and delegation (a) shall be a Person which shall be qualified to
service mortgage loans for Fannie Mae or Freddie Mac; (b) shall have a net worth
of not less than $10,000,000 (unless otherwise approved by each Rating Agency
pursuant to clause (ii) below); (c) shall be reasonably satisfactory to
Thornburg and the Indenture Trustee (as evidenced in writing signed by

                                       59
<PAGE>

Thornburg and the Indenture Trustee); and (d) shall execute and deliver to the
Indenture Trustee an agreement, in form and substance reasonably satisfactory to
the Indenture Trustee, which contains an assumption by such Person of the due
and punctual performance and observance of each covenant and condition to be
performed or observed by it as master servicer under this Agreement from and
after the effective date of such agreement; (ii) each Rating Agency shall be
given prior written notice of the identity of the proposed successor to the
Master Servicer and each Rating Agency's ratings of the Notes in effect
immediately prior to such assignment, sale and delegation will not be
downgraded, qualified or withdrawn as a result of such assignment, sale and
delegation, as evidenced by a letter to such effect delivered to the Master
Servicer and the Indenture Trustee; and (iii) the Master Servicer assigning and
selling the master servicing shall deliver to the Indenture Trustee an Officer's
Certificate and an Independent Opinion of Counsel, (delivered at the Master
Servicer's expense) each stating that all conditions precedent to such action
under this Agreement have been completed and such action is permitted by and
complies with the terms of this Agreement. No such assignment or delegation
shall affect any liability of the Master Servicer arising prior to the effective
date thereof.

         Section 4.27 Determination of LIBOR.

         (a) On each LIBOR Determination Date the Master Servicer shall
determine LIBOR on the basis of the provisions of the definition of "LIBOR."

         (b) The establishment of LIBOR by the Master Servicer and the Master
Servicer's subsequent calculation of the Note Interest Rates applicable to the
Notes for the relevant Accrual Period, in the absence of manifest error, will be
final and binding. In all cases, absent manifest error, the Master Servicer may
conclusively rely on quotations of LIBOR as such quotations appear on Telerate
Screen Page 3750.

         Section 4.28 Realization upon Troubled Mortgage Loans.

         The Master Servicer shall have the right, but not the obligation, to
sell or work out (or to cause a Servicer to sell or work out) any Mortgage Loan
as to which the Master Servicer reasonably believes that default in payment is
likely, provided, however, that, with respect to any such sale of a Mortgage
Loan by the Master Servicer or a Servicer, the related sale price shall be no
less than the Scheduled Principal Balance of such Mortgage Loan as of the last
day of the Due Period immediately preceding the date of such sale plus accrued
interest thereon through such sale date. Any and all proceeds from such a sale
shall be deemed to be Liquidation Proceeds hereunder and any such Mortgage Loan
which has been sold shall be deemed a Liquidated Mortgage Loan hereunder.

                                   ARTICLE V

                        DEPOSITS AND PAYMENTS TO HOLDERS

         Section 5.01 Servicing Accounts.

         (a) The Master Servicer shall enforce the obligation of each Servicer
to establish and maintain one or more custodial accounts (the "Servicing
Accounts") in accordance with the

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applicable Servicing Agreement, with records to be kept with respect thereto on
a Mortgage Loan by Mortgage Loan basis, into which accounts shall be deposited
within 48 hours (or as of such other time specified in the related Servicing
Agreement) of receipt all collections of principal and interest on any Mortgage
Loan and with respect to any REO Property received by a Servicer, including
Principal Prepayments, Insurance Proceeds, Liquidation Proceeds, amounts
received under the Guaranty Surety Bond, and advances made from the Servicer's
own funds (less, in the case of each Servicer, the applicable servicing
compensation, in whatever form and amounts as permitted by the applicable
Servicing Agreement) and all other amounts to be deposited in each such
Servicing Account. The Servicer is hereby authorized to make withdrawals from
and deposits to the related Servicing Account for purposes required or permitted
by this Agreement and the applicable Servicing Agreement. For the purposes of
this Agreement, Servicing Accounts shall also include such other accounts as the
Servicer maintains for the escrow of certain payments, such as taxes and
insurance, with respect to certain Mortgaged Properties. Each Servicing
Agreement sets forth the criteria for the segregation, maintenance and
investment of each related Servicing Account, the contents of which are
acceptable to the parties hereto as of the date hereof and changes to which
shall not be made unless such changes are made in accordance with the provisions
of Section 8.03 hereof.

         (b) [Reserved];

         (c) To the extent provided in the related Servicing Agreement and
subject to this Article V, on or before each Servicer Remittance Date, each
Servicer shall withdraw or shall cause to be withdrawn from the related
Servicing Accounts and shall immediately deposit or cause to be deposited in the
Collection Account amounts representing the following collections and payments
(other than with respect to principal of or interest on the Mortgage Loans due
on or before the Cut-off Date) with respect to each of the Mortgage Loans it is
servicing:

                  (i) Monthly Payments on the Mortgage Loans received or any
         related portion thereof advanced by the Servicers pursuant to the
         Servicing Agreements which were due on or before the related Due Date,
         amounts received under the Guaranty Surety Bond but net of the amount
         thereof comprising the Servicing Fees;

                  (ii) Principal Prepayments in full and any Liquidation
         Proceeds, Insurance Proceeds or condemnation proceeds received by the
         Servicers with respect to such Mortgage Loans in the related Prepayment
         Period, with interest to the date of prepayment or liquidation, net of
         the amount thereof comprising the Servicing Fees;

                  (iii) Principal Prepayments in part received by the Servicers
         for such Mortgage Loans in the related Prepayment Period;

                  (iv) Prepayment Penalty Amounts, if any, and only if required
         under the related Servicing Agreement; and

                  (v) any amount to be used as a delinquency advance or to pay
         any Prepayment Interest Shortfalls, in each case, as required to be
         paid under the related Servicing Agreement.

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         (d) Withdrawals may be made from a Servicing Account only to make
remittances as provided in Section 5.01(c), 5.02 and 5.03; to reimburse the
Master Servicer or a Servicer for Advances which have been recovered by
subsequent collection from the related Mortgagor; to remove amounts deposited in
error; to remove fees, charges or other such amounts deposited on a temporary
basis; or to clear and terminate the account at the termination of this
Agreement in accordance with Section 7.01. As provided in Sections 5.01(c) and
5.02(b), certain amounts otherwise due to the Servicers may be retained by them
and need not be deposited in the Collection Account.

         Section 5.02 Collection Account.

         (a) The Master Servicer shall establish and maintain an account, in the
name of the Securities Intermediary, for the benefit of the Indenture Trustee
and the Securityholders, as a segregated account which shall be an Eligible
Account (the "Collection Account"). The Master Servicer will deposit in the
Collection Account as identified by the Master Servicer and as received by the
Master Servicer, the following amounts:

                  (i) any amounts withdrawn from a Servicing Account pursuant to
         Section 5.01(c);

                  (ii) any Advance and any Compensating Interest Payments
         required to be made by the Master Servicer to the extent required but
         not made by a Servicer;

                  (iii) any Insurance Proceeds or Liquidation Proceeds received
         by or on behalf of the Master Servicer or which were not deposited in a
         Servicing Account;

                  (iv) the Purchase Price with respect to any Mortgage Loans
         purchased by the Seller under this Agreement, any Substitution Amounts
         pursuant to Section 3.03 of this Agreement, the Purchase Price with
         respect to any Mortgage Loans purchased by Thornburg or TMI, as
         applicable, pursuant to Section 4.18, and all proceeds of any Mortgage
         Loans or property acquired with respect thereto repurchased by
         Thornburg pursuant to Section 7.03;

                  (v) any amounts required to be deposited with respect to
         losses on investments of deposits in the Collection Account pursuant to
         Section 5.02(c); and

                  (vi) any other amounts received by or on behalf of the Master
         Servicer or the Indenture Trustee and required to be deposited in the
         Collection Account pursuant to this Agreement.

         (b) All amounts deposited to the Collection Account shall be held by
the Master Servicer in accordance with the terms and provisions of this
Agreement. The requirements for crediting the Collection Account or the Note
Account shall be exclusive, it being understood and agreed that, without
limiting the generality of the foregoing, payments in the nature of (i) late
payment charges or assumption, tax service, statement account or payoff,
substitution, satisfaction, release and other like fees and charges (but
excluding all Prepayment Penalty Amounts) and (ii) the items enumerated in
Subsections 5.03(a)(i), (ii), (iii), (iv), (vi), (vii), (ix) and (x) with
respect to

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the Master Servicer, need not be credited by the Master Servicer or the related
Servicer to the Note Account or the Collection Account, as applicable. In the
event that the Master Servicer shall deposit or cause to be deposited to the
Note Account any amount not required to be credited thereto, the Indenture
Trustee, upon receipt of a written request therefor signed by a Servicing
Officer of the Master Servicer, shall promptly transfer such amount to the
Master Servicer, any provision herein to the contrary notwithstanding.

         (c) The amount at any time credited to the Collection Account shall be
invested, in the name of the Indenture Trustee, or its nominee, for the benefit
of the Securityholders, in Permitted Investments as follows. All Permitted
Investments shall be for the benefit of Thornburg, in its capacity as Servicer,
except that the investment income with respect to the investment of funds in the
Collection Account made on the Business Day prior to the Master Servicer
Remittance Date shall be for the benefit of the Master Servicer. All Permitted
Investments made for the benefit of Thornburg shall be made at the written
direction of Thornburg to the Master Servicer (or, if no such written direction
is received, in investments of the type specified in clause (vi) of the
definition of Permitted Investments), shall mature or be subject to redemption
or withdrawal on or before, and shall be held until, the Business Day prior to
the next succeeding Master Servicer Remittance Date. Any and all investment
earnings from such Permitted Investments shall be paid to Thornburg, and the
risk of loss of moneys resulting from such investments shall be borne by and be
the risk of Thornburg. Thornburg shall deposit the amount of any such loss in
the Collection Account within two Business Days of receipt of notification of
such loss but not later than the next succeeding Master Servicer Remittance
Date.

         All Permitted Investments for the benefit of the Master Servicer shall
be in such Permitted Investments as shall be selected by the Master Servicer and
shall mature (and be subject to withdrawal and be held until) the next
succeeding Master Servicer Remittance Date. Any and all investment earnings from
such Permitted Investments shall be paid to the Master Servicer and the risk of
loss on such Permitted Investments shall be borne by and be the risk of the
Master Servicer. The Master Servicer shall deposit the amount of any such loss
in the Collection Account no later than the next succeeding Master Servicer
Remittance Date.

         Section 5.03 Permitted Withdrawals and Transfers from the Collection
Account.

         (a) The Master Servicer will, from time to time on demand of a
Servicer, or for its own account as set forth below, make or cause to be made
such withdrawals or transfers from the Collection Account, in the case of a
demand by a Servicer, as the applicable Servicer has designated for such
transfer or withdrawal pursuant to the applicable Servicing Agreement, or as the
Master Servicer has determined to be appropriate in accordance herewith, for the
following purposes:

                  (i) to reimburse the Master Servicer or any Servicer for any
         Advance of its own funds or of such Servicer's own funds, the right of
         the Master Servicer or a Servicer to reimbursement pursuant to this
         subclause (i) being limited to amounts received on a particular
         Mortgage Loan (including, for this purpose, the Purchase Price
         therefor, Insurance Proceeds and Liquidation Proceeds) which represent
         late payments or recoveries of the principal of or interest on such
         Mortgage Loan respecting which such Advance was made;

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<PAGE>

                  (ii) to reimburse the Master Servicer or any Servicer from
         Insurance Proceeds or Liquidation Proceeds relating to a particular
         Mortgage Loan for amounts expended by the Master Servicer or such
         Servicer in good faith in connection with the restoration of the
         related Mortgaged Property which was damaged by an Uninsured Cause or
         in connection with the liquidation of such Mortgage Loan;

                  (iii) to reimburse the Master Servicer or any Servicer from
         Insurance Proceeds relating to a particular Mortgage Loan for insured
         expenses incurred with respect to such Mortgage Loan and to reimburse
         the Master Servicer or such Servicer from Liquidation Proceeds from a
         particular Mortgage Loan for Liquidation Expenses incurred with respect
         to such Mortgage Loan;

                  (iv) to pay the Master Servicer or any Servicer, as
         appropriate, from Liquidation Proceeds or Insurance Proceeds received
         in connection with the liquidation of any Mortgage Loan, the amount
         which it or such Servicer would have been entitled to receive under
         subclause (ix) of this Subsection 5.03(a) as servicing compensation on
         account of each defaulted scheduled payment on such Mortgage Loan if
         paid in a timely manner by the related Mortgagor;

                  (v) to pay the Master Servicer or any Servicer from the
         Purchase Price for any Mortgage Loan, the amount which it or such
         Servicer would have been entitled to receive under subclause (ix) of
         this Subsection (a) as servicing compensation;

                  (vi) to reimburse the Master Servicer or any Servicer for
         servicing related advances of funds, the right to reimbursement
         pursuant to this subclause being limited to amounts received on the
         related Mortgage Loan (including, for this purpose, the Purchase Price
         therefor, Insurance Proceeds and Liquidation Proceeds) which represent
         late recoveries of the payments for which such servicing advances were
         made;

                  (vii) to reimburse the Master Servicer or any Servicer for any
         Advance or advance, after a Realized Loss has been allocated with
         respect to the related Mortgage Loan if the Advance or advance has not
         been reimbursed pursuant to clauses (i) and (vi);

                  (viii) to pay the Master Servicer its monthly Master Servicing
         Fee and any investment income and other additional servicing
         compensation payable pursuant to Section 4.12;

                  (ix) to reimburse the Master Servicer for any expenses
         recoverable by the Master Servicer pursuant to Sections 4.02 and 4.23;

                  (x) to reimburse or pay any Servicer any such amounts as are
         due thereto under the applicable Servicing Agreement and have not been
         retained by or paid to the Servicer, to the extent provided in the
         related Servicing Agreement;

                  (xi) to remove amounts deposited in error; and

                  (xii) to clear and terminate the Collection Account pursuant
         to Section 7.01.

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         (b) In addition, on or before each Master Servicer Remittance Date, the
Master Servicer shall deposit in the Note Account (or remit to the Indenture
Trustee for deposit therein) any Advances or Compensating Interest Payments, to
the extent required but not made by the related Servicer and required to be made
by the Master Servicer with respect to the Mortgage Loans.

         (c) The Master Servicer shall keep and maintain separate accounting, on
a Mortgage Loan by Mortgage Loan basis, for the purpose of accounting for any
payments or reimbursements from the Collection Account pursuant to subclauses
(i) through (vii), inclusive, (ix) and (x) or with respect to any such amounts
which would have been covered by such subclauses had the amounts not been
retained by the Master Servicer without being deposited in the Note Account
under Section 5.02(b), and to allow the Master Servicer to calculate the amount
of the Indenture Trustee Fee due the Indenture Trustee on the related Payment
Date.

         (d) No later than 3:00 p.m. New York time on each Master Servicer
Remittance Date, the Master Servicer will transfer the Interest Remittance
Amount, any Prepayment Penalty Amounts and the Principal Remittance Amount
(which shall include any Indenture Trustee Fees) on deposit in the Collection
Account net of the Master Servicing Fee and any other amounts previously
withdrawn pursuant to Section 5.03(a) with respect to the related Payment Date
to the Indenture Trustee for deposit in the Note Account.

         Section 5.04 The Note Account.

         (a) The Indenture Trustee shall establish and maintain, in the name of
the Securities Intermediary, as a segregated account which shall be an Eligible
Account (the "Note Account") for the benefit of the Securityholders and the
Indenture Trustee. If the existing Note Account ceases to be an Eligible
Account, the Indenture Trustee shall establish a new Note Account that is an
Eligible Account within 20 Business Days and transfer all funds and investment
property on deposit in such existing Note Account into such new Note Account.
The Note Account shall relate solely to the Notes issued hereunder and funds in
the Note Account shall be held separate and apart from and shall not be
commingled with any other monies including, without limitation, other monies of
the Indenture Trustee held under this Agreement.

         (b) On each Master Servicer Remittance Date, the Indenture Trustee
shall deposit amounts received from the Master Servicer pursuant to Section
5.03(d) or cause to be deposited into the Note Account on the Business Day
immediately following the day on which amounts are remitted by the Master
Servicer to the Indenture Trustee pursuant to Section 5.03(d) or otherwise. The
Indenture Trustee shall make withdrawals from the Note Account only for the
following purposes:

                  (i) to return to the Master Servicer or the applicable
         Servicer, any amounts which should have been withdrawn from the
         Collection Account pursuant to Section 5.02(a);

                  (ii) to pay to itself the monthly Indenture Trustee Fee;

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<PAGE>

                  (iii) to reimburse the Indenture Trustee, the Owner Trustee
         and the Master Servicer for expenses, costs and liabilities incurred by
         or reimbursable to it pursuant to Sections 4.23 or as otherwise
         provided in this Agreement;

                  (iv) to make distributions of Retained Interest to the
         Retained Interest Holder on each Payment Date;

                  (v) to remove amounts deposited in error;

                  (vi) to make payments on the Notes as contemplated by
         Section 5.06;

                  (vii) to pay any Additional Yield Maintenance Payments for
         such Payment Date;

                  (viii) to make payments to the Certificate Account as
         contemplated by Section 5.08; and

                  (ix) to clear and terminate the Note Account pursuant to
         Section 7.01.

         The Indenture Trustee may invest, or cause to be invested, funds held
in the Note Account at the direction of Thornburg (which may be standing
instructions), in its capacity as a Servicer, which funds, if invested, shall be
invested in Permitted Investments (which may be obligations of the Indenture
Trustee). All such investments must be payable on demand or mature on or before
the next Payment Date if the obligor of such Permitted Investment is the
Indenture Trustee or, if the obligor is any other Person, no later than the
Business Day preceding such Payment Date. All such Permitted Investments will be
made in the name of the Indenture Trustee (in its capacity as such) or its
nominee. All income and gain realized from any such investment shall be for the
benefit of Thornburg as additional compensation in connection with its capacity
as a Servicer and shall be subject to withdrawal on order from time to time and
shall not be part of the Trust Estate. The amount of any losses incurred in
respect of any such investments shall be paid by Thornburg for deposit in the
Note Account out of its own funds, without any right of reimbursement therefor,
immediately as realized. In the event Thornburg does not provide written
direction to the Indenture Trustee pursuant to this Section, all funds on
deposit in the Note Account shall remain uninvested.

         The Indenture Trustee or its Affiliates are permitted to receive
additional compensation that could be deemed to be in the Indenture Trustee's
economic self-interest for (i) serving as investment adviser, administrator,
shareholder, servicing agent, custodian or sub-custodian with respect to certain
of the Permitted Investments, (ii) using Affiliates to effect transactions in
certain Permitted Investments and (iii) effecting transactions in certain
Permitted Investments. Such compensation shall not be payable or reimbursable
under this Agreement.

         Section 5.05 Yield Maintenance Account.

         The Indenture Trustee shall establish and maintain an account, for the
benefit of the Indenture Trustee and the Noteholders, as a segregated account
which shall be an Eligible Account (the "Yield Maintenance Account"). Pursuant
to each Yield Maintenance Agreement,

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the Yield Maintenance Counterparty shall have provided the Indenture Trustee and
the Master Servicer with notice of the Net Yield Maintenance Payment, if any, to
be made by the Issuer to the Yield Maintenance Counterparty or the Net Yield
Maintenance Amount or Yield Maintenance Amount, if any, to be paid by the Yield
Maintenance Counterparty to the Indenture Trustee for the account of the Issuer
pursuant to such Yield Maintenance Agreement for each Payment Date. Any Net
Yield Maintenance Amounts or Yield Maintenance Amounts received by the Indenture
Trustee pursuant to the Yield Maintenance Agreements in connection with each
such Payment Date shall be deposited into the Yield Maintenance Account and
distributed as part of Monthly Excess Cashflow for such Payment Date in
accordance with Section 5.06(d). Any Net Yield Maintenance Payment made by the
Issuer to the Yield Maintenance Counterparty pursuant to any Swap Agreement
shall be paid in accordance with Section 5.06(b).

         Upon termination of all seven Yield Maintenance Agreements and payment
of all amounts owed by the Yield Maintenance Counterparty thereunder, following
application by the Indenture Trustee of funds in the Yield Maintenance Account
on the next succeeding Payment Date to pay amounts owed pursuant to this Section
and Section 5.06, the Indenture Trustee shall terminate the Yield Maintenance
Account.

         Section 5.06 Payments from the Note Account.

         (a) On each Payment Date the Indenture Trustee (or the Paying Agent on
behalf of the Indenture Trustee) shall make payments from amounts in the Note
Account in accordance with this Section 5.06.

         (b) On each Payment Date, the Indenture Trustee shall pay the Interest
Remittance Amount for such date in the following order of priority in accordance
with the report of the Master Servicer provided to the Indenture Trustee no
later than one Business Day prior to each Payment Date:

                  (i) the aggregate Net Yield Maintenance Payments, if any, due
         from the Trust to the Yield Maintenance Counterparty under the Swap
         Agreements for such Payment Date;

                  (ii) concurrently, to the Class A-1 and Class A-2 Notes,
         Current Interest and any Carryforward Interest for each such Class and
         such Payment Date, pro rata on the basis of the amount of such interest
         each such Class is entitled to receive on such Payment Date;

                  (iii) to the Class M Notes, Current Interest and any
         Carryforward Interest for such Class and such Payment Date; and

                  (iv) any Interest Remittance Amount remaining after
         application pursuant to clauses (i) through (iii) above for application
         as part of Monthly Excess Cashflow for such Payment Date as provided in
         subsection (d) of this Section.

         (c) On each Payment Date, the Indenture Trustee shall pay the Principal
Payment Amount for such date in accordance with the report of the Master
Servicer provided to the Indenture

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Trustee no later than one Business Day prior to each Payment Date, first, to
each Class of Notes, concurrently, in proportion to their respective Class
Principal Amounts immediately prior to such Payment Date, until the Class
Principal Amounts thereof are reduced to zero, second, to the Yield Maintenance
Counterparty, any Additional Yield Maintenance Payments for such Payment Date,
and third, to the Certificate Account for distribution in accordance with
Section 5.08;

         (d) On each Payment Date, the Indenture Trustee shall pay the Monthly
Excess Cashflow for such date in accordance with the report of the Master
Servicer provided to the Indenture Trustee no later than one Business Day prior
to each Payment Date in the following order of priority:

                  (i) for each Payment Date for which there is an
         Overcollateralization Deficiency, to fund the Extra Principal Payment
         Amount portion of the Principal Payment Amount for such Payment Date
         and be paid as principal pursuant to subclause (c) above;

                  (ii) concurrently, to the Class A-1 and Class A-2 Notes, any
         Basis Risk Shortfall and Unpaid Basis Risk Shortfall due and owing to
         the Class A-1 and Class A-2 Notes pro rata based on the amount of the
         Basis Risk Shortfall and Unpaid Basis Risk Shortfall due to such
         classes;

                  (iii) to the Class M Notes, any Basis Risk Shortfall and
         Unpaid Basis Risk Shortfall for such Class and such Payment Date;

                  (iv) to the Class A-2 Notes, any Deferred Amount for such
         Class and such Payment Date;

                  (v) to the Class M Notes, any Deferred Amount for such Class
         and such Payment Date;

                  (vi) to the Master Servicer, the Indenture Trustee, the
         Custodian, the Owner Trustee and the Administrator, any amounts
         reimbursable pursuant to the Operative Agreements and not previously
         reimbursed to such parties;

                  (vii) to the Yield Maintenance Counterparty, any Additional
         Yield Maintenance Payment for such Payment Date; and

                  (viii) to the Certificate Account, for distribution in
         accordance with Section 5.08.

         (e) On each Payment Date, the Indenture Trustee shall pay any
Prepayment Penalty Amounts to the Certificate Account for distribution in
accordance with Section 5.08.

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         Section 5.07 Allocation of Losses.

         On each Payment Date, the Class Principal Amounts of the Class M and
Class A-2 Notes will be reduced by the amount of any Applied Loss Amount for
such date, in the following order of priority:

                  (i) to the Class M Notes, until the Class Principal Amount
         thereof has been reduced to zero; and

                  (ii) to the Class A-2 Notes, until the Class Principal Amount
         thereof has been reduced to zero.

         Section 5.08 The Certificate Account. (a) The Administrator, for the
benefit of the Certificateholders, shall establish and maintain in the name of
the Owner Trustee on behalf of the Certificateholders an account (the
"Certificate Account") entitled "Certificate Account, Wilmington Trust Company,
as Owner Trustee, in trust for the Holders of Thornburg Mortgage Securities
Trust 2003-6 Trust Certificates, Series 2003-6."

         (b) On each Payment Date, the Indenture Trustee shall withdraw from the
Note Account all amounts required to be deposited in the Certificate Account
pursuant to Section 5.06 and remit such amount to the Owner Trustee or the
Administrator for deposit into the Certificate Account. On each Payment Date,
the Owner Trustee or the Administrator shall distribute all amounts on deposit
in the Certificate Account to the Certificateholders in respect of the Trust
Certificate. On the Payment Date on which the Class Principal Amount of the
Notes is reduced to zero, the Administrator shall distribute all amounts
remaining on deposit in the Certificate Account to the Certificateholders in
respect of the Trust Certificate in order to clear and terminate the Certificate
Account in connection with the termination of this Agreement.

         (c) All distributions made on the Trust Certificate shall be made by
wire transfer of immediately available funds to the account of such
Certificateholder. The final distribution on the Trust Certificate will be made
in like manner, but only upon presentment and surrender of such Trust
Certificate at the location specified in the notice to the Certificateholder of
such final distribution.

         Section 5.09 Control of the Trust Accounts.

         (a) The Depositor, the Issuer and the Indenture Trustee hereby appoint
Deutsche Bank National Trust Company as Securities Intermediary with respect to
the Trust Accounts and the Certificate Account, and the Issuer has, pursuant to
the Indenture, granted to the Indenture Trustee, for the benefit of the
Securityholders, a security interest to secure all amounts due Securityholders
hereunder in and to the Trust Accounts and the Security Entitlements to all
Financial Assets credited to the Trust Accounts, including without limitation
all amounts, securities, investments, Financial Assets, investment property and
other property from time to time deposited in or credited to the Trust Accounts
and all proceeds thereof. Amounts held from time to time in the Trust Accounts
will continue to be held by the Securities Intermediary for the benefit of the
Indenture Trustee, as collateral agent, for the benefit of the Securityholders,
and amounts held from time to time in the Certificate Account will continue to
be held by the

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Securities Intermediary for the benefit of the Issuer, as collateral agent, for
the benefit of the Certificateholders. Upon the termination of the Issuer or the
discharge of the Indenture, the Indenture Trustee shall inform the Securities
Intermediary of such termination. By acceptance of their Securities or interests
therein, the Securityholders shall be deemed to have appointed Deutsche Bank
National Trust Company as Securities Intermediary. Deutsche Bank National Trust
Company hereby accepts such appointment as Securities Intermediary;

         (b) With respect to the Trust Account Property credited to the Trust
Accounts or the Certificate Account, the Securities Intermediary agrees that:

                  (i) with respect to any Trust Account Property that is held in
         deposit accounts, each such deposit account shall be subject to the
         exclusive custody and control of the Securities Intermediary, and the
         Securities Intermediary shall have sole signature authority with
         respect thereto;

                  (ii) all assets in the Trust Accounts and the Certificate
         Account are agreed by the Securities Intermediary to be treated as
         Financial Assets; and

                  (iii) any such Trust Account Property that is, or is treated
         as, a Financial Asset shall be physically delivered (accompanied by any
         required endorsements) to, or credited to an account in the name of,
         the Securities Intermediary or other eligible institution maintaining
         any Trust Accounts or the Certificate Account in accordance with the
         Securities Intermediary's customary procedures such that the Securities
         Intermediary or such other institution establishes a Security
         Entitlement in favor of the Indenture Trustee (or the Issuer, in the
         case of the Certificate Account) with respect thereto over which the
         Securities Intermediary or such other institution has Control;

         (c) The Securities Intermediary hereby confirms that (A) each Trust
Account and the Certificate Account are accounts to which Financial Assets are
or may be credited, and the Securities Intermediary shall, subject to the terms
of this Agreement, treat the Indenture Trustee, as collateral agent, as entitled
to exercise the rights that comprise any Financial Asset credited to any Trust
Account, and the Issuer, as collateral agent, as entitled to exercise the rights
that comprise any Financial Asset credited to the Certificate Account, (B) all
Trust Account Property in respect of any Trust Account or the Certificate
Account will be promptly credited by the Securities Intermediary to the
applicable account, and (C) all securities or other property underlying any
Financial Assets credited to any Trust Account or the Certificate Account shall
be registered in the name of the Securities Intermediary, endorsed to the
Securities Intermediary or in blank or credited to another securities account
maintained in the name of the Securities Intermediary and in no case (x) will
any Financial Asset credited to any Trust Account be registered in the name of
the Depositor or the Issuer, payable to the order of the Depositor or the Issuer
or specially endorsed to the Depositor or the Issuer, or (y) will any Financial
Asset credited to the Certificate Account be registered in the name of the
Depositor, payable to the order of the Depositor or specially endorsed to the
Depositor, except to the extent the foregoing have been specially endorsed to
the Securities Intermediary or in blank;

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         (d) The Securities Intermediary hereby agrees that each item of
property (whether investment property, Financial Asset, security, instrument or
cash) credited to any Trust Account or the Certificate Account shall be treated
as a Financial Asset;

         (e) If at any time the Securities Intermediary shall receive an
Entitlement Order from the Indenture Trustee directing transfer or redemption of
any Financial Asset relating to any Trust Account, the Securities Intermediary
shall comply with such Entitlement Order without further consent by the
Depositor, the Issuer or any other Person. If at any time the Indenture Trustee
notifies the Securities Intermediary in writing that the Issuer has been
terminated or the Indenture discharged in accordance herewith and with the Trust
Agreement or the Indenture, as applicable, and the security interest granted
pursuant to the Indenture has been released, then thereafter if the Securities
Intermediary shall receive any order from the Depositor or the Issuer directing
transfer or redemption of any Financial Asset relating to any Trust Account, the
Securities Intermediary shall comply with such Entitlement Order without further
consent by the Indenture Trustee or any other Person;

         If at any time the Securities Intermediary shall receive an Entitlement
Order from the Issuer directing transfer or redemption of any Financial Asset
relating to the Certificate Account, the Securities Intermediary shall comply
with such Entitlement Order without further consent by the Depositor or any
other Person;

         (f) In the event that the Securities Intermediary has or subsequently
obtains by agreement, operation of law or otherwise a security interest in any
Trust Account or the Certificate Account or any Financial Asset credited
thereto, the Securities Intermediary hereby agrees that such security interest
shall be subordinate to the security interest of the Indenture Trustee, in the
case of the Trust Accounts, or of the Issuer, in the case of the Certificate
Account. The Financial Assets credited to the Trust Accounts, or the Certificate
Account will not be subject to deduction, set-off, banker's lien, or any other
right in favor of any Person other than the Indenture Trustee in the case of the
Trust Accounts, or of the Issuer, in the case of the Certificate Account (except
that the Securities Intermediary may set-off (i) all amounts due to it in
respect of its customary fees and expenses for the routine maintenance and
operation of the Trust Accounts, and the Certificate Account, and (ii) the face
amount of any checks which have been credited to any Trust Account or the
Certificate Account but are subsequently returned unpaid because of uncollected
or insufficient funds);

         (g) There are no other agreements entered into between the Securities
Intermediary in such capacity and the Depositor or the Issuer with respect to
any Trust Account, or the Depositor or the Issuer with respect to the
Certificate Account. In the event of any conflict between this Agreement (or any
provision of this Agreement) and any other agreement now existing or hereafter
entered into, the terms of this Agreement shall prevail;

         (h) The rights and powers granted under the Indenture and herein to (x)
the Indenture Trustee have been granted in order to perfect its security
interest in the Trust Accounts and the Security Entitlements to the Financial
Assets credited thereto, and (y) the Issuer have been granted in order to
perfect its security interest in the Certificate Account and the Security
Entitlements to the Financial Assets credited thereto, and are powers coupled
with an interest and will neither be affected by the bankruptcy of the Depositor
or the Issuer nor by the lapse of time.

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The obligations of the Securities Intermediary hereunder shall continue in
effect until the security interest of the Indenture Trustee in the Trust
Accounts or of the Issuer in the Certificate Account, and in such Security
Entitlements, has been terminated pursuant to the terms of this Agreement and
the Indenture Trustee or the Issuer, as applicable, has notified the Securities
Intermediary of such termination in writing; and

         (i) Notwithstanding anything else contained herein, the Depositor and
the Issuer agree that the Trust Accounts and the Certificate Account will be
established only with the Securities Intermediary or another institution meeting
the requirements of this Section, which by acceptance of its appointment as
Securities Intermediary agrees substantially as follows: (1) it will comply with
Entitlement Orders related to the Trust Accounts issued by the Indenture
Trustee, as collateral agent, without further consent by the Depositor or the
Issuer, and with Entitlement Orders related to the Certificate Account issued by
the Issuer, as collateral agent, without further consent by the Depositor; (2)
until termination of the Issuer or discharge of the Indenture, it will not enter
into any other agreement related to such accounts pursuant to which it agrees to
comply with Entitlement Orders of any Person other than the Indenture Trustee,
as collateral agent with respect to the Trust Accounts or the Issuer, as
collateral agent with respect to the Certificate Account; and (3) all assets
delivered or credited to it in connection with such accounts and all investments
thereof will be promptly credited to the applicable account.

         (j) Notwithstanding the foregoing, the Issuer shall have the power to
instruct the Indenture Trustee to make withdrawals and distributions from the
Trust Accounts for the purpose of permitting the Indenture Trustee to carry out
its duties under the Indenture.

         (k) The Issuer agrees to take or cause to be taken such further
actions, to execute, deliver and file or cause to be executed, delivered and
filed such further documents and instruments (including, without limitation, any
financing statements under the Relevant UCC or this Agreement) as may be
necessary to perfect the interests created by this Section in favor of the
Issuer and the Indenture Trustee and otherwise fully to effectuate the purposes,
terms and conditions of this Section. The Issuer shall:

                  (i) promptly execute, deliver and file any financing
         statements, amendments, continuation statements, assignments,
         certificates and other documents with respect to such interests and
         perform all such other acts as may be necessary in order to perfect or
         to maintain the perfection of the Issuer's and the Indenture Trustee's
         security interest in the Trust Account Property; and

                  (ii) make the necessary filings of financing statements or
         amendments thereto within five days after the occurrence of any of the
         following: (1) any change in its corporate name or any trade name or
         its jurisdiction of organization; (2) any change in the location of its
         chief executive office or principal place of business; and (3) any
         merger or consolidation or other change in its identity or corporate
         structure and promptly notify the Issuer and the Indenture Trustee of
         any such filings.

                  (iii) Neither the Depositor nor the Issuer shall organize
         under the law of any jurisdiction other than the State under which each
         is organized as of the Closing Date (whether changing its jurisdiction
         of organization or organizing under an additional

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         jurisdiction) without giving 30 days prior written notice of such
         action to its immediate transferee, including the Indenture Trustee.
         Before effecting such change, each of the Depositor or the Issuer
         proposing to change its jurisdiction of organization shall prepare and
         file in the appropriate filing office any financing statements or other
         statements necessary to continue the perfection of the interests of its
         immediate transferees, including the Indenture Trustee, in the Trust
         Account Property. In connection with the transactions contemplated by
         the Operative Agreements relating to the Trust Account Property, each
         of the Depositor and the Issuer authorizes its immediate transferee,
         including the Indenture Trustee, to file in any filing office any
         initial financing statements, any amendments to financing statements,
         any continuation statements, or any other statements or filings
         described in this Section 5.09.

         None of the Securities Intermediary or any director, officer, employee
or agent of the Securities Intermediary shall be under any liability to the
Indenture Trustee or the Securityholders or any other person or for any action
taken, or not taken, in good faith pursuant to this Agreement, or for errors in
judgment; provided, however, that this provision shall not protect the
Securities Intermediary against any liability to the Indenture Trustee, the
Issuer or the Securityholders which would otherwise be imposed by reason of the
Securities Intermediary's willful misconduct, bad faith or negligence in the
performance of its obligations or duties hereunder. The Securities Intermediary
and any director, officer, employee or agent of the Securities Intermediary may
rely in good faith on any document of any kind which, prima facie, is properly
executed and submitted by any Person respecting any matters arising hereunder.
The Securities Intermediary shall be under no duty to inquire into or
investigate the validity, accuracy or content of such document. The Issuer shall
indemnify the Securities Intermediary for and hold it harmless against any loss,
liability or expense arising out of or in connection with this Agreement and
carrying out its duties hereunder, including the costs and expenses of defending
itself against any claim of liability, except in those cases where the
Securities Intermediary has been guilty of bad faith, negligence or willful
misconduct. The foregoing indemnification shall survive any termination of this
Agreement or the resignation or removal of the Securities Intermediary.

         The Securities Intermediary shall be entitled to all of the
protections, immunities, benefits and indemnities afforded to the Indenture
Trustee under Article VI of the Indenture.

         Section 5.10 Statements.

         (a) Not later than 5:00 p.m. one Business Day prior to each Payment
Date, the Master Servicer shall make available to the Indenture Trustee and the
Yield Maintenance Counterparty, and concurrently with each distribution to
Securityholders, the Master Servicer shall make available to each
Securityholder, the Seller, the Owner Trustee and each Rating Agency, a
statement based solely on loan-level information provided to it by the Servicers
(the "Payment Date Statement") as to the distributions to be made or made, as
applicable, on such Payment Date. Information in the Payment Date Statement
relating to or based on amounts available in the Yield Maintenance Account shall
be based on information provided by the Yield Maintenance Counterparty regarding
any required Net Yield Maintenance Payments to be made by the Issuer or any Net
Yield Maintenance Amounts or Yield Maintenance Amounts required to

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be paid by the Yield Maintenance Counterparty for the related Payment Date
pursuant to the Yield Maintenance Agreements. The Indenture Trustee shall
confirm to the Master Servicer receipt of any Net Yield Maintenance Amounts or
Yield Maintenance Amounts in the Yield Maintenance Account on the Business Day
immediately preceding such Payment Date. The Payment Date Statement will include
the following:

                  (i) the aggregate amount of the payment to be made on such
         Payment Date to the Holders of each Class of Notes, to the extent
         applicable, allocable to principal;

                  (ii) the aggregate amount of the payment to be made on such
         Payment Date to the Holders of each Class of Notes allocable to
         interest and the calculation thereof;

                  (iii) the amount, if any, of any distribution to the Holders
         of the Trust Certificate;

                  (iv) (A) the aggregate amount of any Monthly Advances required
         to be made by or on behalf of the Servicers (or the Master Servicer)
         with respect to such Payment Date, (B) the aggregate amount of such
         Monthly Advances actually made, and (C) the amount, if any, by which
         (A) above exceeds (B) above;

                  (v) the total number of Mortgage Loans in the aggregate and
         the aggregate Scheduled Principal Balance in the aggregate and
         separately for each of the Three-Year, Five-Year, Seven-Year and
         Ten-Year Hybrid Mortgage Loans, in each case at the close of business
         at the end of the related Due Period and the Net Funds Cap for such
         Payment Date;

                  (vi) the Class Principal Amount of each Class of Notes, to the
         extent applicable, as of such Payment Date after giving effect to
         payments allocated to principal reported under clause (i) above,
         separately identifying any reduction of any of the foregoing Note
         Principal Amounts due to Applied Loss Amounts;

                  (vii) the amount of any Realized Losses incurred with respect
         to the Mortgage Loans (x) in the applicable Prepayment Period and (y)
         in the aggregate since the Cut-off Date;

                  (viii) the amount of the Master Servicing Fees, Servicing Fees
         and Indenture Trustee Fees, if any, paid during the Due Period to which
         such distribution relates;

                  (ix) the number and aggregate Scheduled Principal Balance of
         Mortgage Loans, (a) delinquent 30 to 59 days on a contractual basis,
         (b) delinquent 60 to 89 days on a contractual basis, (c) delinquent 90
         or more days on a contractual basis, (d) as to which foreclosure
         proceedings have been commenced in the month in which such Payment Date
         occurs, in each case as of the close of business on the last Business
         Day of the calendar month immediately preceding, (e) in bankruptcy and
         (f) that are REO Properties;

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                  (x) the aggregate Scheduled Principal Balance of any Mortgage
         Loans with respect to which the related Mortgaged Property became a REO
         Property as of the close of business on the last Business Day of the
         calendar month immediately preceding the month in which such Payment
         Date occurs;

                  (xi) with respect to substitution of Mortgage Loans in the
         preceding calendar month, the Scheduled Principal Balance of each
         Deleted Mortgage Loan, and of each Qualified Substitute Mortgage Loan;

                  (xii) the aggregate outstanding Deferred Amounts, Carryforward
         Interest, Basis Risk Shortfalls and Unpaid Basis Risk Shortfalls, if
         any, for each Class of Notes, after giving effect to payments made on
         such Payment Date;

                  (xiii) the Note Interest Rate applicable to such Payment Date
         with respect to each Class of Notes;

                  (xiv) the Interest Remittance Amount and the Principal
         Remittance Amount applicable to such Payment Date;

                  (xv) the Monthly Excess Interest and Monthly Excess Cashflow
         for such Payment Date;

                  (xvi) the Overcollateralization Amount, the
         Overcollateralization Deficiency, if any, the Principal Payment Amount
         and the Extra Principal Payment Amount for such Payment Date; and

                  (xvii) the level of LIBOR and any Net Yield Maintenance
         Payments being made by the Issuer expressed as a dollar amount and as a
         per annum rate which reduced the Net Funds Cap and any Net Yield
         Maintenance Amounts and Yield Maintenance Amounts being paid by the
         Yield Maintenance Counterparty for such period and the notional
         balances on each Yield Maintenance Agreement for such Payment Date.

         In the case of information furnished pursuant to subclauses (i), (ii)
and (vi) above, the amounts shall also be expressed as a dollar amount per
$1,000 of original principal amount of Notes.

         The Master Servicer will make the Payment Date Statement (and, at its
option, any additional files containing the same information in an alternative
format) available each month to Securityholders and the other parties to this
Agreement via the Master Servicer's internet website. The Master Servicer's
internet website shall initially be located at "www.ctslink.com." Assistance in
using the website can be obtained by calling the Master Servicer's customer
service desk at (301) 815-6600. Parties that are unable to use the above
distribution option are entitled to have a paper copy mailed to them via first
class mail by calling the customer service desk and indicating such. The Master
Servicer shall have the right to change the way such reports are distributed in
order to make such distribution more convenient and/or more accessible to the
parties, and the Master Servicer shall provide timely and adequate notification
to all parties regarding any such change.

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         (b) Within a reasonable period of time after the end of each calendar
year, the Indenture Trustee shall, upon written request, furnish to each Person
who at any time during the calendar year was a Securityholder, if requested in
writing by such Person, such information as is reasonably necessary to provide
to such Person a statement containing aggregate payment information necessary to
enable Holders of the Securities to prepare their tax returns. Such obligation
of the Indenture Trustee shall be deemed to have been satisfied to the extent
that substantially comparable information shall be prepared and furnished by the
Indenture Trustee to Securityholders pursuant to any requirements of the Code as
are in force from time to time.

         (c) On each Payment Date, the Master Servicer shall supply an
electronic tape to Bloomberg Financial Markets, Inc. in a format acceptable to
Bloomberg Financial Markets, Inc. on a monthly basis, and shall supply an
electronic tape to Loan Performance and Intex Solutions in a format acceptable
to Loan Performance and Intex Solutions on a monthly basis.

         Section 5.11 Advances.

         If the Monthly Payment on a Mortgage Loan that was due on a related Due
Date and is delinquent, other than as a result of application of the Relief Act,
and for which the related Servicer was required to make an advance pursuant to
the related Servicing Agreement exceeds the amount deposited in the Collection
Account which will be used for an advance with respect to such Mortgage Loan,
the Master Servicer will deposit in the Collection Account not later than the
Master Servicer Remittance Date immediately preceding the related Payment Date
an amount equal to such deficiency, net of the Servicing Fee and the Master
Servicing Fee, for such Mortgage Loan except to the extent the Master Servicer
determines any such Advance to be Nonrecoverable from Liquidation Proceeds,
Insurance Proceeds, condemnation proceeds or future payments on the Mortgage
Loan for which such Advance was made. Subject to the foregoing, the Master
Servicer shall continue to make such Advances through the date that the related
Servicer is required to do so under its Servicing Agreement. If applicable, on
the Master Servicer Remittance Date, the Master Servicer shall present an
Officer's Certificate to the Indenture Trustee (i) stating that the Master
Servicer elects not to make a Advance in a stated amount and (ii) detailing the
reason it deems the advance to be Nonrecoverable.

         Section 5.12 Compensating Interest Payments.

         The amount of the Master Servicing Fee payable to the Master Servicer
in respect of any Payment Date shall be reduced (but not below zero) by the
amount of any Compensating Interest Payment for such Payment Date, but only to
the extent that Prepayment Interest Shortfalls relating to such Payment Date are
required to be paid but are not actually paid by the related Servicers on the
applicable Servicer Remittance Date. Such amount shall not be treated as an
Advance and shall not be reimbursable to the Master Servicer.

         Section 5.13 Termination Receipts.

         In the event of an early termination of a Yield Maintenance Agreement,
(i) any termination payment made by the Yield Maintenance Counterparty to the
Issuer ("Termination Receipts") will be deposited in a segregated account which
shall be an Eligible Account established by the Indenture Trustee (the
"Termination Receipts Account") and (ii) any amounts

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received from a replacement counterparty ("Replacement Receipts") will be
deposited in a segregated account which shall be an Eligible Account established
by the Indenture Trustee (the "Replacement Receipts Account"). The Indenture
Trustee shall invest, or cause to be invested, funds held in the Termination
Receipts Account and the Replacement Receipts Account in short-term Permitted
Investments described in clause (i) of the definition thereof. All such
investments must be payable on demand or mature no later than the Business Day
preceding such Payment Date. All such Permitted Investments will be made in the
name of the Indenture Trustee (in its capacity as such) or its nominee. All
income and gain realized from any such investment shall be deposited in the
Termination Receipts Account or the Replacement Receipts Account, as applicable.

         Unless otherwise permitted by the Rating Agencies, the Indenture
Trustee will promptly, with the assistance and cooperation of the Depositor, use
amounts on deposit in the Termination Receipts Account, if necessary, to enter
into replacement Yield Maintenance Agreements with, to the extent reasonably
available, terms and conditions not materially different from those provided on
the Closing Date.

         Amounts on deposit in the Replacement Receipts Account shall be held
for the benefit of the related Yield Maintenance Counterparty and paid to such
Yield Maintenance Counterparty if the Issuer is required to make a payment to
such Yield Maintenance Counterparty following an event of default or termination
event with respect to the Issuer under the related Yield Maintenance Agreement.
Any amounts not so applied shall, following the termination or expiration of
such Yield Maintenance Agreement, be applied as part of the Interest Remittance
Amount in accordance with Section 5.06.

                                   ARTICLE VI

                        MASTER SERVICER EVENTS OF DEFAULT

         Section 6.01 Master Servicer Events of Default; Indenture Trustee To
Act; Appointment of Successor.

         (a) If any one of the following events (each, a "Master Servicer Event
of Default") shall occur and be continuing:

                  (i) the failure by the Master Servicer to make any Advance or
         to deposit in the Collection Account or Note Account any deposit
         required to be made or failure to remit to the Indenture Trustee any
         other payment required under the terms of this Agreement, and such
         failure continues unremedied for a period of three Business Days after
         the date upon which written notice of such failure, requiring the same
         to be remedied, shall have been given to the Master Servicer;

                  (ii) the failure by the Master Servicer duly to observe or
         perform, in any material respect, any other covenants, obligations or
         agreements of the Master Servicer as set forth in this Agreement, which
         failure continues unremedied for a period of 60 days (or, in the case
         of a breach of its obligation to provide a Master Servicer
         Certification pursuant to Section 4.16, 30 days), in each case after
         the date (A) on which written notice

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         of such failure, requiring the same to be remedied, shall have been
         given to the Master Servicer by the Indenture Trustee or to the Master
         Servicer and the Indenture Trustee by Holders of Notes evidencing at
         least 25% of the aggregate Class Principal Amount of all Classes of
         Notes or (B) on which a Servicing Officer of the Master Servicer has
         actual knowledge of such failure; or

                  (iii) the entry against the Master Servicer of a decree or
         order by a court or agency or supervisory authority having jurisdiction
         in the premises for the appointment of a trustee, conservator, receiver
         or liquidator in any insolvency, conservatorship, receivership,
         readjustment of debt, marshalling of assets and liabilities or similar
         proceedings, or for the winding up or liquidation of its affairs, and
         the continuance of any such decree or order unstayed and in effect for
         a period of 60 days; or

                  (iv) the Master Servicer shall voluntarily go into
         liquidation, consent to the appointment of a conservator or receiver or
         liquidator or similar person in any insolvency, readjustment of debt,
         marshalling of assets and liabilities or similar proceedings of or
         relating to the Master Servicer or of or relating to all or
         substantially all of its property; or a decree or order of a court or
         agency or supervisory authority having jurisdiction in the premises for
         the appointment of a conservator, receiver, liquidator or similar
         person in any insolvency, readjustment of debt, marshalling of assets
         and liabilities or similar proceedings, or for the winding-up or
         liquidation of its affairs, shall have been entered against the Master
         Servicer and such decree or order shall have remained in force
         undischarged, unbonded or unstayed for a period of 60 days; or the
         Master Servicer shall admit in writing its inability to pay its debts
         generally as they become due, file a petition to take advantage of any
         applicable insolvency or reorganization statute, make an assignment for
         the benefit of its creditors or voluntarily suspend payment of its
         obligations;

         (b) then, and in each and every such case, so long as a Master Servicer
Event of Default shall not have been remedied within the applicable grace
period, the Indenture Trustee shall, at the written direction of the Majority
Securityholders, or at its option may, by notice then given in writing to the
Master Servicer, terminate all of the rights and obligations of the Master
Servicer as servicer under this Agreement. Any such notice to the Master
Servicer shall also be given to each Rating Agency, the Depositor, the Issuer,
the Owner Trustee and the Seller. On or after the receipt by the Master Servicer
(and by the Indenture Trustee if such notice is given by the Holders) of such
written notice, all authority and power of the Master Servicer under this
Agreement, whether with respect to the Certificates or the Mortgage Loans or
otherwise, shall pass to and be vested in the Indenture Trustee and the
Indenture Trustee is hereby authorized and empowered to execute and deliver, on
behalf of the Master Servicer, as attorney-in-fact or otherwise, any and all
documents and other instruments, and to do or accomplish all other acts or
things necessary or appropriate to effect the purposes of such notice of
termination, whether to complete the transfer and endorsement of each Mortgage
Loan and related documents or otherwise. The Master Servicer agrees to cooperate
with the Indenture Trustee in effecting the termination of the responsibilities
and rights of the Master Servicer hereunder, including, without limitation, the
delivery to the Indenture Trustee of all documents and records requested by it
to enable it to assume the Master Servicer's functions under this Agreement
within ten Business Days

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subsequent to such notice and the transfer within one Business Day subsequent to
such notice to the Indenture Trustee for the administration by it of all cash
amounts that shall at the time be held by the Master Servicer and to be
deposited by it in the Collection Account, the Note Account or any Servicing
Account or that have been deposited by the Master Servicer in such accounts or
thereafter received by the Master Servicer with respect to the Mortgage Loans or
any REO Property received by the Master Servicer. All reasonable costs and
expenses (including attorneys' fees) incurred in connection with transferring
the Master Servicer's duties and the Mortgage Files to the successor Master
Servicer and amending this Agreement to reflect such succession as Master
Servicer pursuant to this Section shall be paid by the predecessor Master
Servicer (or if the predecessor Master Servicer is the Indenture Trustee, the
initial Master Servicer) upon presentation of reasonable documentation of such
costs and expenses. The termination of the rights and obligations of the Master
Servicer shall not affect any liability it may have incurred prior to such
termination.

         (c) Notwithstanding the foregoing, if a Master Servicer Event of
Default described in clause (i) of Section 6.01(a) shall occur, the Indenture
Trustee shall, by notice in writing to the Master Servicer, which may be
delivered by telecopy, immediately suspend all of the rights and obligations of
the Master Servicer thereafter arising under this Agreement, but without
prejudice to any rights it may have as a Securityholder or to reimbursement of
outstanding Advances or other amounts for which the Master Servicer was entitled
to reimbursement as of the date of termination, and the Indenture Trustee shall
act as provided in Section 6.02 to carry out the duties of the Master Servicer,
including the obligation to make any Advance the nonpayment of which was a
Master Servicer Event of Default described in clause (i) of Section 6.01(a). Any
such action taken by the Indenture Trustee must be prior to the distribution on
the relevant Payment Date. If the Master Servicer shall within two Business Days
following such suspension remit to the Indenture Trustee the amount of any
Advance the nonpayment of which by the Master Servicer was a Master Servicer
Event of Default described in clause (i) of Section 6.01(a) and accrued interest
covering the period of suspension on the amount of such Advance at Deutsche
Bank's prime rate (as published in the Wall Street Journal) plus 300 basis
points, the Indenture Trustee, subject to the last sentence of this paragraph,
shall permit the Master Servicer to resume its rights and obligations as Master
Servicer hereunder. The Master Servicer agrees that it will reimburse the
Indenture Trustee for actual, necessary and reasonable costs incurred by the
Indenture Trustee because of action taken pursuant to this subsection. The
Master Servicer agrees that if a Master Servicer Event of Default as described
in clause (i) of Section 6.01(a) shall occur more than two times in any 12 month
period, the Indenture Trustee shall be under no obligation to permit the Master
Servicer to resume its rights and obligations as Master Servicer hereunder.

         Section 6.02 Indenture Trustee to Act.

         (a) From and after the date the Master Servicer (and the Indenture
Trustee, if notice is sent by the Holders of the Notes) receives a notice of
termination pursuant to Section 6.01, the Indenture Trustee shall be the
successor in all respects to the Master Servicer in its capacity as servicer
under this Agreement and the transactions set forth or provided for herein and
shall be subject to all the responsibilities, duties and liabilities relating
thereto placed on the Master Servicer by the terms and provisions hereof arising
on and after its succession. As compensation

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therefor, the Indenture Trustee shall be entitled to such compensation as the
Master Servicer would have been entitled to hereunder if no such notice of
termination had been given. Notwithstanding the above, (i) if the Indenture
Trustee is unwilling to act as successor Master Servicer or (ii) if the
Indenture Trustee is legally unable so to act, the Indenture Trustee shall
appoint or petition a court of competent jurisdiction to appoint, any
established housing and home finance institution, bank or other mortgage loan or
home equity loan servicer having a net worth of not less than $15,000,000 as the
successor to the Master Servicer hereunder in the assumption of all or any part
of the responsibilities, duties or liabilities of the Master Servicer hereunder;
provided, that the appointment of any such successor Master Servicer shall not
result in the qualification, reduction or withdrawal of the ratings assigned to
the Notes by any Rating Agency as evidenced by a letter to such effect from each
Rating Agency. Pending appointment of a successor to the Master Servicer
hereunder, unless the Indenture Trustee is prohibited by law from so acting, the
Indenture Trustee shall act in such capacity as hereinabove provided. In
connection with such appointment and assumption, the successor shall be entitled
to receive compensation out of payments on Mortgage Loans in an amount equal to
the compensation which the Master Servicer would otherwise have received
pursuant to Section 4.12. The appointment of a successor Master Servicer shall
not affect any liability of the predecessor Master Servicer which may have
arisen under this Agreement prior to its termination as Master Servicer to pay
any deductible under an insurance policy pursuant to Section 4.08 or to
indemnify the Indenture Trustee pursuant to of this Agreement), nor shall any
successor Master Servicer be liable for any acts or omissions of the predecessor
Master Servicer or for any breach by such Master Servicer of any of its
representations or warranties contained herein or in any related document or
agreement. The Indenture Trustee and such successor shall take such action,
consistent with this Agreement, as shall be necessary to effectuate any such
succession. In the event that the Indenture Trustee does not succeed to the
duties of the Master Servicer pursuant to Section 6.02 hereof, Thornburg shall
have the right, but not the obligation, to be appointed successor master
servicer hereunder.

         (b) Any successor, including the Indenture Trustee, to the Master
Servicer as Master Servicer shall during the term of its service as Master
Servicer continue to service and administer the Mortgage Loans for the benefit
of Securityholders, and maintain in force a policy or policies of insurance
covering errors and omissions in the performance of its obligations as Master
Servicer hereunder and a fidelity bond in respect of its officers, employees and
agents to the same extent as the Master Servicer is so required pursuant to
Section 4.03.

         (c) Notwithstanding anything else herein to the contrary, in no event
shall the Indenture Trustee be liable for any servicing fee or for any
differential in the amount of the servicing fee paid hereunder and the amount
necessary to induce any successor Master Servicer to act as successor Master
Servicer under this Agreement and the transactions set forth or provided for
herein.

         Section 6.03 Waiver of Master Servicer Event of Default.

         The Majority Securityholders may, on behalf of all Securityholders, by
notice in writing to the Indenture Trustee, direct the Indenture Trustee to
waive any events permitting removal of any Master Servicer under this Agreement.
Upon any waiver of a Master Servicer Event of

                                       80
<PAGE>

Default, such event shall cease to exist and any Master Servicer Event of
Default arising therefrom shall be deemed to have been remedied for every
purpose of this Agreement. No such waiver shall extend to any subsequent or
other event or impair any right consequent thereto except to the extent
expressly so waived. Notice of any such waiver shall be given by the Indenture
Trustee to each Rating Agency.

         Section 6.04 Notification to Holders.

         Upon any termination or appointment of a successor to any Master
Servicer pursuant to this Article VI or Section 4.25, the Indenture Trustee
shall give prompt written notice thereof to the Securityholders at their
respective addresses appearing in the Note Register, the Certificate Register
and to each Rating Agency.

         No later than 60 days after the occurrence of any event which
constitutes or which, with notice or a lapse of time or both, would constitute a
Master Servicer Event of Default of which a Responsible Officer of the Indenture
Trustee becomes aware, the Indenture Trustee shall transmit by mail to all
Securityholders notice of such occurrence unless such Master Servicer Event of
Default shall have been waived or cured.

                                  ARTICLE VII

                                   TERMINATION

         Section 7.01 Termination.

         (a) This Agreement shall terminate upon any of the following events:
the earlier of (i) the satisfaction and discharge of the Indenture and notice to
the Indenture Trustee of such discharge, the disposition of all funds with
respect to the Collateral and the payment of all amounts due and payable to the
Securityholders, the Indenture Trustee (including the Indenture Trustee as
Paying Agent), the Owner Trustee, the Administrator, the Master Servicer, the
Servicers and the Issuer pursuant to this Agreement and the Indenture (including
payment pursuant to Section 7.03 below); or (ii) mutual written consent of the
Master Servicer, the Seller, the Depositor, the Indenture Trustee, the Issuer
and all then Securityholders in writing.

         (b) Notice of termination of this Agreement pursuant to Section
7.01(a)(i) shall be sent by the Indenture Trustee to the Noteholders in
accordance with the Indenture and to the Certificateholders by the Certificate
Paying Agent (as defined in the Trust Agreement) as provided in the Trust
Agreement. Notice of termination of this Agreement pursuant to Section
7.01(a)(ii) shall be mailed or transmitted by facsimile by the Indenture Trustee
to the Noteholders and by the Certificate Paying Agent to the Certificateholders
on the Business Day immediately following the day on which the Indenture Trustee
and the Certificate Paying Agent, respectively, receive notice of such
termination, and such notices to the Securityholders shall state that the
Securityholders are to surrender their respective Notes and Trust Certificates,
respectively, for cancellation and shall specify the place where such Notes or
Trust Certificates are to be surrendered.

                                       81
<PAGE>

         Section 7.02 Optional Notes Purchase Right. On any Payment Date
occurring on or after the Initial Optional Notes Purchase Date, Thornburg
Mortgage Home Loans Inc. has the assignable option to call all Classes of Notes,
in whole but not in part, under Article X of the Indenture. Notice of any
exercise of the Optional Notes Purchase Right shall be sent by the Indenture
Trustee to Securityholders in accordance with the Indenture. Upon exercise of
the Optional Notes Purchase Right, Thornburg Mortgage Home Loans Inc. or its
assignee will call each Class of Notes at the related Note Purchase Price. After
exercise of the Optional Notes Purchase Right each Class of Notes will remain
outstanding and will not be retired as provided in the Indenture.

         Section 7.03 Optional Termination. Thornburg, as a servicer, may, at
its option, terminate this Agreement on any Payment Date on which the aggregate
of the Scheduled Principal Balances of the Mortgage Loans is equal to or less
than 10% of the Scheduled Principal Balance as of the Cut-Off Date, by
purchasing, on such Payment Date, all of the outstanding Mortgage Loans, REO
Properties and other property of the Issuer (an "Optional Termination") at a
price equal to the sum of (i) the outstanding Scheduled Principal Balances of
the Mortgage Loans (other than in respect of REO Properties), (ii) the lesser of
(x) the appraised value of any REO Property as determined by the higher of two
appraisals completed by two independent appraisers selected by the Depositor at
the expense of the Holder of the Trust Certificate and (y) the outstanding
principal balance of each Mortgage Loan related to any REO Property, and (iii)
in all cases, accrued and unpaid interest thereon at the applicable Mortgage
Rate through the end of the Due Period preceding the final Payment Date, plus
unreimbursed Servicing Advances and Advances and any unpaid Master Servicing
Fees and Servicing Fees allocable to such Mortgage Loans and REO Properties,
plus all amounts, if any, then due and owing to the Indenture Trustee, the Owner
Trustee, the Administrator, the Yield Maintenance Counterparty (including Net
Yield Maintenance Payments) and the Master Servicer under the Operative
Agreements (the "Termination Price"); provided, however, if the Termination
Price is insufficient to pay the Noteholders the full Redemption Price required
to be paid under the Indenture after paying all expenses due under clause (iv)
above, then the Termination Price shall also include the fair market value of
the outstanding Yield Maintenance Agreements.

         Section 7.04 Procedure Upon Termination.

         (a) Notice of any termination pursuant to the provisions of Sections
7.01 and 7.03, specifying the Payment Date upon which the final distribution
shall be made, shall be given promptly by the Indenture Trustee by first class
mail to Securityholders. Such notice shall specify (A) the Payment Date upon
which final distribution on the Securities of all amounts required to be
distributed to Securityholders will be made upon presentation and surrender of
the Securities at the Corporate Trust Office, and (B) that the Record Date
otherwise applicable to such Payment Date is not applicable, distribution being
made only upon presentation and surrender of the Securities at the office or
agency of the Indenture Trustee therein specified. The Indenture Trustee shall
give such notice to the Master Servicer, the Owner Trustee, the Administrator
and the Note Registrar at the time such notice is given to Holders of the
Securities. Upon any such termination, the duties of the Note Registrar with
respect to the Notes shall terminate and the Indenture Trustee shall terminate
or request the Master Servicer to terminate, the Trust Accounts, the Certificate
Account and any other account or fund maintained with

                                       82
<PAGE>

respect to the Securities, subject to the Indenture Trustee's obligation
hereunder to hold all amounts payable to Securityholders in trust without
interest pending such payment.

         (b) In the event that all of the Holders do not surrender their
Securities for cancellation within three months after the time specified in the
above-mentioned written notice, the Indenture Trustee shall give a second
written notice to the remaining Securityholders to surrender their Securities
for cancellation and receive the final distribution with respect thereto. If
within nine months after the second notice any Securities shall not have been
surrendered for cancellation, the Indenture Trustee shall, subject to applicable
state law relating to escheatment, pay over to the Issuer all amounts
distributable to such Holders and such Holders shall look only to the Issuer for
payment. No interest shall accrue on any amount held by the Indenture Trustee
and not distributed to a Securityholder due to such Securityholder's failure to
surrender its Securities for payment of the final distribution thereon in
accordance with this Section.

                                  ARTICLE VIII

                            MISCELLANEOUS PROVISIONS

         Section 8.01 Binding Nature of Agreement; Assignment. This Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns.

         Section 8.02 Entire Agreement. This Agreement contains the entire
agreement and understanding among the parties hereto with respect to the subject
matter hereof, and supersedes all prior and contemporaneous agreements,
understandings, inducements and conditions, express or implied, oral or written,
of any nature whatsoever with respect to the subject matter hereof. The express
terms hereof control and supersede any course of performance and/or usage of the
trade inconsistent with any of the terms hereof.

         Section 8.03 Amendment. (a) This Agreement may be amended from time to
time by the Seller, the Depositor, the Issuer, the Master Servicer and the
Indenture Trustee, without notice to or the consent of any of the
Securityholders, but with the prior written consent of the Yield Maintenance
Counterparty (but only to the extent such amendment materially adversely affects
the amounts, priority or timing of payments under the Yield Maintenance
Agreements), (i) to cure any ambiguity, (ii) to cause the provisions herein to
conform to or be consistent with or in furtherance of the statements made with
respect to the Securities, the Issuer or this Agreement in any Offering
Document, or to correct or supplement any provision herein which may be
inconsistent with any other provisions herein or in any other Operative
Agreement, (iii) to make any other provisions with respect to matters or
questions arising under this Agreement or (iv) to add, delete, or amend any
provisions to the extent necessary or desirable to comply with any requirements
imposed by the Code. No such amendment effected pursuant to clauses (i) through
(iii) of the preceding sentence shall adversely affect in any material respect
the interests of any Securityholder. Prior to entering into any amendment
without the consent of Noteholders pursuant to this paragraph, the Indenture
Trustee may require an Opinion of Counsel (at the expense of the party
requesting such amendment) to the effect that such amendment is permitted under
this paragraph. Any such amendment shall be deemed not to adversely affect in
any material respect any Noteholder if the Indenture Trustee receives (i)
written confirmation

                                       83
<PAGE>

from each Rating Agency that such amendment will not cause a Rating Agency to
withdraw, qualify or reduce the then current rating assigned to the Notes or
(ii) an Opinion of Counsel to such effect.

         (b) This Agreement may also be amended from time to time by the
Depositor, the Issuer, the Master Servicer, the Seller and the Indenture Trustee
with the prior written consent of the Yield Maintenance Counterparty (but only
to the extent such amendment materially adversely affects the amounts, priority
or timing of payments under the Yield Maintenance Agreements) and with the
consent of the Holders of not less than 66-2/3% of the Note Principal Amount of
the Notes and of the Holder of the Trust Certificate for the purpose of adding
any provisions to or changing in any manner or eliminating any of the provisions
of this Agreement or of modifying in any manner the rights of the
Securityholders; provided, however, that no such amendment may (i) reduce in any
manner the amount of, delay the timing of, or change the manner in which
payments received on or with respect to the Trust Estate are required to be made
on any Class of Securities, without the consent of the Securityholders of such
Class, or (ii) reduce the aforesaid percentages of Note Principal Amount of
Notes, the Holders of which are required to consent to any such amendment
without the consent of the Securityholders of 100% of such Securities. For
purposes of this paragraph, references to "Holder" or "Holders" shall be deemed
to include, in the case of Book-Entry Notes, the related Note Owners.

         (c) Promptly after the execution of any such amendment, the Indenture
Trustee shall furnish written notification of the substance of such amendment to
each Securityholder, the Depositor and to each Rating Agency.

         (d) It shall not be necessary for the consent of Securityholders under
this Section 8.03 to approve the particular form of any proposed amendment, but
it shall be sufficient if such consent shall approve the substance thereof. The
manner of obtaining such consents and of evidencing the authorization of the
execution thereof by Securityholders shall be subject to such reasonable
regulations as the Indenture Trustee may prescribe.

         Section 8.04 Acts of Securityholders. Except as otherwise specifically
provided herein, whenever Securityholder action, consent or approval is required
under this Agreement, such action, consent or approval shall be deemed to have
been taken or given on behalf of, and shall be binding upon, all Securityholders
if the Majority Securityholders agree to take such action or give such consent
or approval.

         Section 8.05 Recordation of Agreement. To the extent permitted by
applicable law, this Agreement, or a memorandum thereof if permitted under
applicable law, is subject to recordation in all appropriate public offices for
real property records in all of the counties or other comparable jurisdictions
in which any or all of the properties subject to the Mortgages are situated, and
in any other appropriate public recording office or elsewhere, such recordation
to be effected by the Depositor on direction of Holders of not less than 66-2/3%
of the Note Principal Amount of the Notes and of the Holder of the Trust
Certificate and at the expense of those requesting such recordation, but only
when accompanied by an Opinion of Counsel to the effect that such recordation
materially and beneficially affects the interests of the Securityholders, or is
necessary for the administration or servicing of the Mortgage Loans.

                                       84
<PAGE>

         Section 8.06 Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT
REFERENCE TO ITS CONFLICT OF LAW PROVISIONS (OTHER THAN SECTION 5-1401 OF THE
GENERAL OBLIGATIONS LAW), AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE
PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

         Section 8.07 Notices.

         All directions, demands and notices hereunder shall be in writing and
shall be deemed to have been duly given if personally delivered at or mailed by
first class mail, postage prepaid, or by express delivery service, to (a) in the
case of the Seller, to Thornburg Mortgage Home Loans, Inc., 150 Washington
Avenue, Suite 302, Santa Fe, New Mexico 87501, Attention: Deborah Burns
(telecopy number (505) 954-5300), or such other address or telecopy number as
may hereafter be furnished to the Depositor, the Master Servicer, the Issuer and
the Indenture Trustee in writing by the Seller, (b) in the case of the Indenture
Trustee, to the Corporate Trust Office or such other address or telecopy number
as may hereafter be furnished to the Depositor, the Master Servicer, the Issuer
and the Seller in writing by the Indenture Trustee, (c) in the case of the
Depositor, to Structured Asset Securities Corporation, 745 Seventh Avenue,
Seventh Floor, New York, New York 10019, Attention: Mortgage Backed Finance, or
such other address or telecopy number as may be furnished to the Seller, the
Master Servicer, the Issuer and the Indenture Trustee in writing by the
Depositor, (d) in the case of the Master Servicer Wells Fargo Bank Minnesota,
National Association, P.O. Box 98, Columbia, Maryland 21046, or for overnight
delivery, 9062 Old Annapolis Road, Columbia, Maryland 21045 (Attention:
Thornburg 2003-6), Facsimile no.: (410) 715-2380, or such other address or
telecopy number as may be furnished to the Depositor, the Seller, the Issuer and
the Indenture Trustee in writing by the Master Servicer, (e) in the case of the
Issuer, c/o Wilmington Trust Company, 1100 North Market Street, Wilmington,
Delaware 19801, Attention: Corporate Trust Administrator, or such other address
or telecopy number as may be furnished to the Depositor, the Seller, the Master
Servicer and the Indenture Trustee by the Issuer, (f) in the case of the Rating
Agencies, as set forth in Section 8.12. Any notice required or permitted to be
mailed to a Securityholder shall be given by first class mail, postage prepaid,
at the address of such Holder as shown in the Note Register or the Certificate
Register, as applicable. Notice of any Master Servicer Event of Default shall be
given by telecopy and by certified mail. Any notice so mailed within the time
prescribed in this Agreement shall be conclusively presumed to have duly been
given when mailed, whether or not the Securityholder receives such notice. A
copy of any notice required to be telecopied hereunder shall also be mailed to
the appropriate party in the manner set forth above.

         Section 8.08 Severability of Provisions. If any one or more of the
covenants, agreements, provisions or terms of this Agreement shall be for any
reason whatsoever held invalid, then such covenants, agreements, provisions or
terms shall be deemed severable from the remaining covenants, agreements,
provisions or terms of this Agreement and shall in no way affect the validity or
enforceability of the other provisions of this Agreement or of the Securities or
the rights of the Holders thereof.

                                       85
<PAGE>

         Section 8.09 Indulgences; No Waivers. Neither the failure nor any delay
on the part of a party to exercise any right, remedy, power or privilege under
this Agreement shall operate as a waiver thereof, nor shall any single or
partial exercise of any right, remedy, power or privilege preclude any other or
further exercise of the same or of any other right, remedy, power or privilege,
nor shall any waiver of any right, remedy, power or privilege with respect to
any occurrence be construed as a waiver of such right, remedy, power or
privilege with respect to any other occurrence. No waiver shall be effective
unless it is in writing and is signed by the party asserted to have granted such
waiver.

         Section 8.10 Headings Not To Affect Interpretation. The headings
contained in this Agreement are for convenience of reference only, and they
shall not be used in the interpretation hereof.

         Section 8.11 Benefits of Agreement. Nothing in this Agreement or in the
Securities, express or implied, shall give to any Person, other than the parties
to this Agreement and their successors hereunder and the Holders of the
Securities, any benefit or any legal or equitable right, power, remedy or claim
under this Agreement.

         Section 8.12 Special Notices to the Rating Agencies. (a) The Indenture
Trustee shall give prompt notice to each Rating Agency of the occurrence of any
of the following events of which it has notice:

                  (i)      any amendment to this Agreement pursuant to
                           Section 6.03; and

                  (ii)     the making of a final payment hereunder.

         (b) All notices to the Rating Agencies provided for by this Section
shall be in writing and sent by first class mail, telecopy or overnight courier,
as follows:

         if to Moody's:

                  Moody's Investors Service, Inc.
                  99 Church Street
                  New York, New York 10004
                  Fax no.: (212) 553-4392

         if to S&P:

                  Standard & Poors Ratings Services, a division
                  of The McGraw-Hill Companies, Inc.
                  55 Water Street
                  New York, New York  10041
                  Fax no.:  (212) 438-2661

         (c) The Master Servicer shall make available to the Rating Agencies
each report prepared pursuant to Section 5.10.

                                       86
<PAGE>

         Section 8.13 Counterparts. This Agreement may be executed in one or
more counterparts, each of which shall be deemed to be an original, and all of
which together shall constitute one and the same instrument.

         Section 8.14 Execution by the Issuer. It is expressly understood and
agreed by the parties hereto that (a) this Agreement is executed and delivered
by Wilmington Trust Company, not individually or personally but solely as Owner
Trustee of the Issuer, in the exercise of the powers and authority conferred and
vested in it as trustee, (b) each of the representations, undertakings and
agreements herein made on the part of the Issuer is made and intended not as
personal representations, undertakings and agreements by Wilmington Trust
Company but is made and intended for the purpose of binding only the Issuer, (c)
nothing herein contained shall be construed as creating any liability on
Wilmington Trust Company, individually or personally, to perform any covenant
either expressed or implied contained herein, all such liability, if any, being
expressly waived by the parties hereto and by any person claiming by, through or
under the parties hereto and (d) under no circumstances shall Wilmington Trust
Company be personally liable for the payment of any indebtedness or expenses of
the Issuer or be liable for the breach or failure of any obligation,
representation, warranty or covenant made or undertaken by the Issuer under this
Agreement or any other document.

                                       87
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused their names to be
signed hereto by their respective officers hereunto duly authorized as of the
day and year first above written.

                                   THORNBURG MORTGAGE SECURITIES
                                   TRUST 2003-6

                                   By:  WILMINGTON TRUST COMPANY, not
                                        in its individual capacity but solely as
                                        Owner Trustee

                                   By:
                                       -----------------------------------------
                                   Name:
                                   Title:

                                   STRUCTURED ASSET SECURITIES CORPORATION,
                                   as Depositor

                                   By:
                                       -----------------------------------------
                                   Name: Michael Hitzmann
                                   Title: Vice President

                                   DEUTSCHE BANK NATIONAL TRUST COMPANY,
                                   as Indenture Trustee

                                   By:
                                       -----------------------------------------
                                   Name:
                                   Title:

                                   By:
                                       -----------------------------------------
                                   Name:
                                   Title:

                                   WELLS FARGO BANK MINNESOTA,
                                   NATIONAL ASSOCIATION, as Master Servicer

                                   By:
                                       -----------------------------------------
                                   Name:
                                   Title:

<PAGE>

                                   THORNBURG MORTGAGE HOME LOANS, INC.,
                                   as Seller,

                                   By:
                                       -----------------------------------------
                                   Name:
                                   Title:

<PAGE>

                                   EXHIBIT A-1

                        FORM OF RECEIPT OF MORTGAGE NOTE

                            RECEIPT OF MORTGAGE NOTE

Structured Asset Securities Corporation
745 Seventh Avenue, 7th Floor
New York, New York 10019

                  Re:      Thornburg Mortgage Securities Trust 2003-6,
                           Mortgage-Backed Notes, Series 2003-6

Ladies and Gentlemen:

         Pursuant to Section 2.01 of the Sale and Servicing Agreement, dated as
of December 1, 2003, among Thornburg Mortgage Securities Trust 2003-6, as
Issuer, Structured Asset Securities Corporation, as Depositor, Thornburg
Mortgage Home Loans, Inc., as Seller, Wells Fargo Bank Minnesota, National
Association, as Master Servicer and Deutsche Bank National Trust Company, as
Indenture Trustee, we hereby acknowledge the receipt of the original Mortgage
Note with respect to each Mortgage Loan listed in the Mortgage Loan Schedule
(other than any Mortgage Loan paid in full or listed on the attached Exception
Report.

         Capitalized words and phrases used herein and not otherwise defined
shall have the respective meanings assigned to them in the Sale and Servicing
Agreement. This acknowledgement is subject in all respects to the terms of
Section 2.02 of the Sale and Servicing Agreement and the Sale and Servicing
Agreement sections cross-referenced therein.

                                                   DEUTSCHE BANK NATIONAL TRUST
                                                   COMPANY, as Indenture Trustee

                                                   By:
                                                      --------------------------
                                                   Name:
                                                   Title:

                                      A-1
<PAGE>

                                   EXHIBIT A-2

               FORM OF INTERIM CERTIFICATION OF INDENTURE TRUSTEE

                              INTERIM CERTIFICATION

                                                                          [date]

Structured Asset Securities Corporation
745 Seventh Avenue, 7th Floor
New York, New York 10019

Thornburg Mortgage Home Loans, Inc.
150 Washington Avenue, Suite 302
Santa Fe, New Mexico 87501

Wells Fargo Bank Minnesota, National Association
9062 Old Annapolis Road
Columbia, Maryland 21045

         Re:      Sale and Servicing Agreement among Thornburg Mortgage
                  Securities Trust 2003-6, as Issuer, Structured Asset
                  Securities Corporation, as Depositor, Thornburg Mortgage Home
                  Loans, Inc., as Seller, Wells Fargo Bank Minnesota, National
                  Association, as Master Servicer and Deutsche Bank National
                  Trust Company, as Indenture Trustee
                  -------------------------------------------------------------

         Ladies and Gentlemen:

         In accordance with Section 2.02 of the above-captioned Sale and
Servicing Agreement (the "Sale and Servicing Agreement"), the undersigned, as
Indenture Trustee, hereby certifies that, as to each Mortgage Loan listed in the
Mortgage Loan Schedule (other than any Mortgage Loan paid in full or listed on
the attached schedule):

         (i)      all documents required to be reviewed by the Indenture Trustee
                  pursuant to Section 2.01 of the Sale and Servicing Agreement
                  are in its possession;

         (ii)     such documents have been reviewed by the Indenture Trustee and
                  have not been mutilated, damaged or torn and relate to such
                  Mortgage Loan; and

         (iii)    based on the Indenture Trustee's examination and only as to
                  the foregoing, the information set forth in the Mortgage Loan
                  Schedule that corresponds to items (i), (ii), (iii), (xiii),
                  (xiv) and (xviii) of the Mortgage Loan Schedule accurately
                  reflects information set forth in the Mortgage File.

         Based on its review and examination and only as to the foregoing
documents, such documents appear regular on their face and related to such
Mortgage Loan.

         The Indenture Trustee has made no independent examination of any
documents contained in each Mortgage File beyond the review specifically
required in the Sale and Servicing

                                      A-2-1

<PAGE>

Agreement. The Indenture Trustee makes no representations as to: (i) the
validity, legality, sufficiency, enforceability, recordability, genuineness,
priority or perfection of any of the documents contained in each Mortgage File
of any of the Mortgage Loans identified on the Mortgage Loan Schedule, or (ii)
the collectibility, insurability, effectiveness or suitability of any such
Mortgage Loan.

         Capitalized words and phrases used herein and not otherwise defined
shall have the respective meanings assigned to them in the Sale and Servicing
Agreement.

                                                  DEUTSCHE BANK NATIONAL TRUST
                                                  COMPANY, as Indenture Trustee

                                                  By:
                                                     --------------------------
                                                  Name:
                                                       ------------------------
                                                  Title:
                                                        -----------------------

<PAGE>

                                   EXHIBIT A-3

                FORM OF FINAL CERTIFICATION OF INDENTURE TRUSTEE

                               FINAL CERTIFICATION

                                                                          [date]

Structured Asset Securities Corporation
745 Seventh Avenue, 7th Floor
New York, New York 10019

Thornburg Mortgage Home Loans, Inc.
150 Washington Avenue, Suite 302
Santa Fe, New Mexico 87501

Wells Fargo Bank Minnesota, National Association
9062 Old Annapolis Road
Columbia, Maryland 21045

         Re:      Sale and Servicing Agreement among Thornburg Mortgage
                  Securities Trust 2003-6, as Issuer, Structured Asset
                  Securities Corporation, as Depositor, Thornburg Mortgage Home
                  Loans, Inc., as Seller, Wells Fargo Bank Minnesota, National
                  Association, as Master Servicer and Deutsche Bank National
                  Trust Company, as Indenture Trustee
                  -------------------------------------------------------------

         Ladies and Gentlemen:

         In accordance with Section 2.02 of the above-captioned Sale and
Servicing Agreement (the "Sale and Servicing Agreement"), the undersigned, as
Indenture Trustee, hereby certifies that as to each Mortgage Loan listed in the
Mortgage Loan Schedule (other than any Mortgage Loan paid in full or listed on
the attached Document Exception Report) it has received all documents required
to be reviewed by the Indenture Trustee pursuant to Section 2.01 of the Sale and
Servicing Agreement.

         Based on its review and examination and only as to the foregoing
documents, (a) such documents appear regular on their face and related to such
Mortgage Loan, and (b) the information set forth in items (i), (ii), (iii),
(xiii), (xiv) and (xviii) of the definition of the "Mortgage Loan Schedule" in
Section 1.01 of the Sale and Servicing Agreement accurately reflects information
set forth in the Mortgage File.

         The Indenture Trustee has made no independent examination of any
documents contained in each Mortgage File beyond the review specifically
required in the Sale and Servicing Agreement. The Indenture Trustee makes no
representations as to: (i) the validity, legality, sufficiency, enforceability,
recordability, genuineness, priority or perfection of any of the documents
contained in each Mortgage File of any of the Mortgage Loans identified on the
Mortgage Loan Schedule, or (ii) the collectibility, insurability, effectiveness
or suitability of any such Mortgage Loan.

                                      A-3-1

<PAGE>

         Capitalized words and phrases used herein and not otherwise defined
shall have the respective meanings assigned to them in the Sale and Servicing
Agreement.

                                                   DEUTSCHE BANK NATIONAL TRUST
                                                   COMPANY, as Indenture Trustee

                                                  By:
                                                     --------------------------
                                                  Name:
                                                       ------------------------
                                                  Title:
                                                        -----------------------

                                      A-3-2

<PAGE>

                                    EXHIBIT B

                  REQUEST FOR RELEASE OF DOCUMENTS AND RECEIPT

                                                        --------------------
                                                                Date

[Addressed to Indenture Trustee
or, if applicable, custodian]

         In connection with the administration of the mortgages held by you as
Indenture Trustee under a certain Sale and Servicing Agreement dated as of
December 1, 2003 by and among Structured Asset Securities Corporation, as
Depositor, Thornburg Mortgage Home Loans, Inc., as Seller, you, as Indenture
Trustee, Wells Fargo Bank Minnesota, National Association, as Master Servicer,
and Thornburg Mortgage Securities Trust 2003-6, as Issuer (the "Sale and
Servicing Agreement"), the undersigned Servicer hereby requests a release of the
Mortgage File held by you as Indenture Trustee with respect to the following
described Mortgage Loan for the reason indicated below.

         Mortgagor's Name:

         Address:

         Loan No.:

         Reason for requesting file:

         1. Mortgage Loan paid in full. (The [Master Servicer] [Servicer] hereby
certifies that all amounts received in connection with the loan have been or
will be credited to the Note Account pursuant to the Sale and Servicing
Agreement.)

         2. The Mortgage Loan is being foreclosed.

         3. Mortgage Loan substituted. (The [Master Servicer] [Servicer] hereby
certifies that a Qualified Substitute Mortgage Loan has been assigned and
delivered to you along with the related Mortgage File pursuant to the Sale and
Servicing Agreement.)

         4. Mortgage Loan repurchased. (The [Master Servicer] [Servicer] hereby
certifies that the Purchase Price has been credited to the Note Account pursuant
to the Sale and Servicing Agreement.)

         5. Other. (Describe)

                                       B-1
<PAGE>

         The undersigned acknowledges that the above Mortgage File will be held
by the undersigned in accordance with the provisions of the Sale and Servicing
greement and will be returned to you within ten (10) days of our receipt of the
Mortgage File, except if the Mortgage Loan has been paid in full, or repurchased
or substituted for a Qualified Substitute Mortgage Loan (in which case the
Mortgage File will be retained by us permanently) and except if the Mortgage
Loan is being foreclosed (in which case the Mortgage File will be returned when
no longer required by us for such purpose).

         Capitalized terms used herein and not otherwise defined shall have the
meanings ascribed to them in the Sale and Servicing Agreement.

                                         ---------------------------------------
                                         [Name of [Master Servicer] [Servicers]]

                                      By:
                                         ---------------------------------------
                                         Name:
                                         Title: Servicing Officer

                                      B-2
<PAGE>

                                    EXHIBIT C

                          LIST OF SERVICING AGREEMENTS

         1. Mortgage Loan Flow Purchase, Sale and Servicing Agreement, dated
December 23, 2002, among Thornburg Mortgage Home Loans, Inc. ("Thornburg"), as
Purchaser, Cendant Mortgage Corporation ("Cendant"), as Seller and Servicer and
Bishop's Gate Residential Mortgage Trust (f/k/a Cendant Residential Mortgage
Trust) ("Bishop's Gate"), as Seller and Additional Collateral Assignment and
Servicing Agreement, dated December 23, 2002, among Thornburg, Cendant and
Bishop's Gate, each as assigned pursuant to the Assignment, Assumption and
Recognition Agreement, dated as of December 1, 2003, among Thornburg, as seller,
Thornburg Mortgage Securities Trust 2003-6, Cendant and Bishop's Gate, and
acknowledged by Wells Fargo Bank Minnesota, National Association ("Wells
Fargo"), as master servicer and Deutsche Bank National Trust Company ("Deutsche
Bank"), as indenture trustee.

         2. Servicing Agreement dated as of March 1, 2002, by and between Wells
Fargo, as master servicer and Thornburg, as seller and servicer, as amended by
the Amendment to Servicing Agreement dated November 26, 2002 and Sub-Servicing
Acknowledgement Agreement dated as of March 1, 2002, by and between Thornburg,
as servicer and Cenlar FSB, as sub-servicer, as amended by the Amendment to
Sub-Servicing Acknowledgement Agreement dated November 26, 2002, including the
related Transfer Notice dated December 17, 2003.

         3. Amended and Restated Correspondent Loan Purchase Agreement, dated
March 27, 2002, between Thornburg and Colonial National Mortgage (f/k/a Colonial
Savings, F.A.) ("Colonial"), including the related Correspondent Transfer
Notice, dated December 17, 2003, from Thornburg to Colonial.

         4. Amended and Restated Correspondent Loan Purchase Agreement, dated
March 25, 2002, between Thornburg and First Republic Bank ("First Republic"),
including the related Correspondent Transfer Notice, dated December 17, 2003,
from Thornburg to First Republic.

                                      C-1

<PAGE>

                                    EXHIBIT D

                                LIST OF SERVICERS

1.       Cendant Mortgage Corporation

2.       Colonial National Mortgage

3.       First Republic Bank

4.       Thornburg Mortgage Home Loans, Inc.

                                      D-1
<PAGE>

                                    EXHIBIT E

                           FORM OF LOST NOTE AFFIDAVIT

         Personally appeared before me the undersigned authority to administer
oaths, ______________________ who first being duly sworn deposes and says:
Deponent is ______________________ of Thornburg Mortgage Home Loans, Inc. (the
"Seller") and who has personal knowledge of the facts set out in this affidavit.

         On ___________________, _________________________ did execute and
deliver a promissory note in the principal amount of $__________.

         That said note has been misplaced or lost through causes unknown and is
currently lost and unavailable after diligent search has been made. The Seller's
records show that an amount of principal and interest on said note is still
presently outstanding, due, and unpaid, and such Seller is still owner and
holder in due course of said lost note.

         The Seller executes this Affidavit for the purpose of inducing Deutsche
Bank National Trust Company, as indenture trustee on behalf of Thornburg
Mortgage Securities Trust 2003-6, Mortgage Loan-Backed Notes, Series 2003-6, to
accept the transfer of the above described loan from the Seller.

         The Seller agrees to indemnify the Issuer, Deutsche Bank National Trust
Company and Structured Asset Securities Corporation and hold them harmless for
any losses incurred by such parties resulting from the fact that the above
described Mortgage Note has been lost or misplaced.

By:
   ----------------------------------

   ----------------------------------

STATE OF                        )
                                )   ss:
COUNTY OF                       )

         On this ____ day of ___________ 20__, before me, a Notary Public, in
and for said County and State, appeared ________________________, who
acknowledged the extension of the foregoing and who, having been duly sworn,
states that any representations therein contained are true.

         Witness my hand and Notarial Seal this ____ day of _______ 20__.

   ----------------------------------

   ----------------------------------

My commission expires                .
                      ---------------

                                      E-1

<PAGE>

                                   SCHEDULE A

MORTGAGE LOAN SCHEDULE

<PAGE>

                                   SCHEDULE B

                            CONVERTED MORTGAGE LOANS

<PAGE>

                                   SCHEDULE C

                             MODIFIED MORTGAGE LOANS

<PAGE>

                                   SCHEDULE D

                        THREE-YEAR HYBRID MORTGAGE LOANS

<PAGE>

                                   SCHEDULE E

                         FIVE-YEAR HYBRID MORTGAGE LOANS

<PAGE>

                                   SCHEDULE F

                        SEVEN-YEAR HYBRID MORTGAGE LOANS

<PAGE>

                                   SCHEDULE G

                         TEN-YEAR HYBRID MORTGAGE LOANS<PAGE>
                                                                 EXHIBIT 10.14.1

                                                                       EXECUTION

                                    INDENTURE

                                     Between

                   THORNBURG MORTGAGE SECURITIES TRUST 2003-6
                                    as Issuer

                                       and

                      DEUTSCHE BANK NATIONAL TRUST COMPANY
                              as Indenture Trustee

                          Dated as of December 1, 2003

                   THORNBURG MORTGAGE SECURITIES TRUST 2003-6,
                      MORTGAGE-BACKED NOTES, SERIES 2003-6

<PAGE>

<TABLE>
<CAPTION>
                                                                                                     Page
                                                                                                     ----
<S>                                                                                                  <C>
            Article I DEFINITIONS AND INCORPORATION BY REFERENCE

Section 1.01. Definitions..............................................................................2
Section 1.02. Incorporation by Reference of Trust Indenture Act........................................8
Section 1.03. Rules of Construction....................................................................8

                              Article II THE NOTES

Section 2.01. Form.....................................................................................9
Section 2.02. Execution, Authentication, Delivery and Dating...........................................9
Section 2.03. Registration; Registration of Transfer and Exchange.....................................10
Section 2.04. Mutilated, Destroyed, Lost or Stolen Notes..............................................12
Section 2.05. Persons Deemed Owners...................................................................13
Section 2.06. Payment of Principal and Interest.......................................................13
Section 2.07. Cancellation............................................................................14
Section 2.08. Authentication of Notes.................................................................14
Section 2.09. Book-Entry Notes........................................................................16
Section 2.10. Notices to Clearing Agency..............................................................17
Section 2.11. Definitive Notes........................................................................17
Section 2.12. Tax.....................................................................................18

                              Article III COVENANTS

Section 3.01. Payment of Principal and Interest.......................................................18
Section 3.02. Maintenance of Office or Agency.........................................................18
Section 3.03. Money for Payments To Be Held in Trust..................................................19
Section 3.04. Existence...............................................................................20
Section 3.05. Protection of Collateral................................................................20
Section 3.06. Performance of Obligations..............................................................21
Section 3.07. Negative Covenants......................................................................
Section 3.08. Covenants of the Issuer.................................................................
Section 3.09. Restricted Payments.....................................................................
Section 3.10. Treatment of Notes as Debt for Tax Purposes.............................................
Section 3.11. Notice of Events of Default.............................................................
Section 3.12. Further Instruments and Acts............................................................
Section 3.13. Annual Statement as to Compliance.......................................................
Section 3.14. Representations and Warranties of the Issuer............................................
Section 3.15. Annual Opinions as to Collateral........................................................
Section 3.16. Master Servicer's Obligations...........................................................

                      Article IV SATISFACTION AND DISCHARGE

Section 4.01. Satisfaction and Discharge of Indenture.................................................25
Section 4.02. Application of Trust Money..............................................................27
Section 4.03. Repayment of Moneys Held by Paying Agent................................................27
</TABLE>

                                       i

<PAGE>

<TABLE>
<CAPTION>
                                                                                                     Page
                                                                                                     ----
<S>                                                                                                  <C>
                      Article V EVENTS OF DEFAULT; REMEDIES

Section 5.01. Events of Default.......................................................................27
Section 5.02. Acceleration of Maturity; Rescission and Annulment......................................28
Section 5.03. Collection of Indebtedness and Suits for Enforcement by Indenture Trustee...............29
Section 5.04. Remedies; Priorities....................................................................
Section 5.05. Limitation of Suits.....................................................................
Section 5.06. Unconditional Rights of Noteholders To Receive Principal and Interest...................
Section 5.07. Restoration of Rights and Remedies......................................................
Section 5.08. Rights and Remedies Cumulative..........................................................
Section 5.09. Delay or Omission Not a Waiver..........................................................
Section 5.10. Control by Noteholders..................................................................
Section 5.11. Waiver of Past Defaults.................................................................
Section 5.12. Undertaking for Costs...................................................................
Section 5.13. Waiver of Stay or Extension Laws........................................................
Section 5.14. Action on Notes.........................................................................
Section 5.15. Optional Preservation of the Collateral.................................................
Section 5.16. Performance and Enforcement of Certain Obligations......................................

                        Article VI THE INDENTURE TRUSTEE

Section 6.01. Duties of Indenture Trustee.............................................................
Section 6.02. Rights of Indenture Trustee.............................................................
Section 6.03. Individual Rights of Indenture Trustee..................................................
Section 6.04. Indenture Trustee's Disclaimer..........................................................
Section 6.05. Notice of Default.......................................................................
Section 6.06. Reports by Indenture Trustee to Holders.................................................
Section 6.07. Compensation and Indemnity..............................................................
Section 6.08. Replacement of Indenture Trustee........................................................
Section 6.09. Successor Indenture Trustee by Merger...................................................
Section 6.10. Appointment of Co-Indenture Trustee or Separate Indenture Trustee.......................
Section 6.11. Eligibility.............................................................................
Section 6.12. Representations and Warranties..........................................................
Section 6.13. Preferential Collection of Claims Against Issuer........................................

                   Article VII NOTEHOLDERS' LISTS AND REPORTS

Section 7.01. Issuer To Furnish Indenture Trustee Names and Addresses of Noteholders..................43
Section 7.02. Preservation of Information; Communications to Noteholders..............................43
Section 7.03. Reports by Issuer.......................................................................
Section 7.04. Reports by Indenture Trustee............................................................

                Article VIII ACCOUNTS, DISBURSEMENTS AND RELEASES

Section 8.01. Collection of Money.....................................................................44
Section 8.02. Establishment of Note Account; Payments on the Notes....................................45
Section 8.03. Release of Collateral...................................................................
Section 8.04. Master Servicer's Monthly Statements....................................................
</TABLE>

                                       ii
<PAGE>

<TABLE>
<CAPTION>
                                                                                                     Page
                                                                                                     ----
<S>                                                                                                  <C>
                       Article IX SUPPLEMENTAL INDENTURES

Section 9.01. Supplemental Indentures Without Consent of Noteholders..................................46
Section 9.02. Supplemental Indentures with Consent of Noteholders.....................................
Section 9.03. Execution of Supplemental Indentures....................................................
Section 9.04. Effect of Supplemental Indenture........................................................
Section 9.05. Conformity with Trust Indenture Act.....................................................
Section 9.06. Reference in Notes to Supplemental Indentures...........................................
Section 9.07. Amendments to Trust Agreement...........................................................

    Article X DISPOSITION OF THE COLLATERAL; REDEMPTION OR CALL OF THE NOTES

Section 10.01. Redemption or Call of the Notes........................................................50
Section 10.02. Form of Redemption or Call Notice......................................................
Section 10.03. Notes Payable on Redemption Date or Note Payment Date..................................

                            Article XI MISCELLANEOUS

Section 11.01. Compliance Certificates and Opinions, etc..............................................51
Section 11.02. Form of Documents Delivered to Indenture Trustee.......................................53
Section 11.03. Acts of Noteholders....................................................................54
Section 11.04. Notices, etc. to Indenture Trustee, the Issuer and Rating Agencies.....................
Section 11.05. Notices to Noteholders; Waiver.........................................................
Section 11.06. Conflict with Trust Indenture Act......................................................
Section 11.07. Effect of Headings and Table of Contents...............................................
Section 11.08. Successors and Assigns.................................................................
Section 11.09. Severability...........................................................................
Section 11.10. Benefits of Indenture and Consent of Noteholders.......................................
Section 11.11. Legal Holidays.........................................................................
Section 11.12. Governing Law..........................................................................
Section 11.13. Counterparts...........................................................................
Section 11.14. Recording of Indenture.................................................................
Section 11.15. Issuer Obligations.....................................................................
Section 11.16. No Petition............................................................................
Section 11.17. Inspection.............................................................................
Section 11.18. Execution by the Issuer................................................................
</TABLE>

EXHIBIT A-1       Form of Class A-1 and Class A-2 Notes
EXHIBIT A-2       Form of Class M Note
EXHIBIT B         Form of ERISA Transfer Affidavit

                                      iii

<PAGE>

         This Indenture dated as of December 1, 2003, between THORNBURG MORTGAGE
SECURITIES TRUST 2003-6, a Delaware statutory trust, as Issuer (the "Issuer"),
and DEUTSCHE BANK NATIONAL TRUST COMPANY, as Indenture Trustee (the "Indenture
Trustee"),

         Each party agrees as follows for the benefit of the other party and for
the benefit of the holders of the Notes and the Yield Maintenance Counterparty:

                                 GRANTING CLAUSE

         Subject to the terms of this Indenture, the Issuer hereby Grants on the
Closing Date to the Indenture Trustee, as Indenture Trustee for the benefit of
the Holders of the Notes and the Yield Maintenance Counterparty, all of the
Issuer's right, title and interest in and to: (i) the Trust Estate (as defined
in the Sale and Servicing Agreement); (ii) the Issuer's rights and benefits but
none of its obligations under the Sale and Servicing Agreement (including the
Issuer's right to cause the Seller to repurchase Mortgage Loans from the Issuer
under certain circumstances described therein); (iii) the Yield Maintenance
Agreements and all payments thereunder; (iv) the Issuer's rights and benefits
but none of its obligations under the Administration Agreement; (v) the Issuer's
rights and benefits but none of its obligations under the Mortgage Loan Purchase
Agreement; (vi) the Issuer's rights and benefits but none of its obligations
under the Servicing Agreements; (vii) the Trust Accounts, all amounts and
property in the Trust Accounts from time to time, and the Security Entitlements
to all Financial Assets credited to the Trust Accounts from time to time; (viii)
all other property of the Trust from time to time; and (ix) all present and
future claims, demands, causes of action and choses in action in respect of any
or all of the foregoing and all payments on or under and all proceeds of every
kind and nature whatsoever in respect of any or all of the foregoing, including
all proceeds of the conversion thereof, voluntary or involuntary, into cash or
other liquid property, all cash proceeds, accounts, accounts receivable, notes,
drafts, acceptances, chattel paper, checks, deposit accounts, insurance
proceeds, condemnation awards, rights to payment of any and every kind and other
forms of obligations and receivables, instruments and other property which at
any time constitute all or part of or are included in the proceeds of any of the
foregoing (collectively, the "Collateral").

         The foregoing Grant is made in trust to secure the payment of principal
of and interest on, and any other amounts owing in respect of, the Notes and to
secure (i) the payment of all amounts due on the Notes in accordance with their
terms, (ii) the payment of all other sums payable under the Indenture with
respect to the Notes, and (iii) compliance with the provisions of this
Indenture, all as provided in this Indenture.

         The Indenture Trustee, as Indenture Trustee on behalf of the holders of
the Notes and the Yield Maintenance Counterparty, acknowledges such Grant,
accepts the trusts hereunder and agrees to perform the duties required of it in
this Indenture in accordance with its terms.

         Each Holder, by acceptance of the Notes, and the Indenture Trustee
agree and acknowledge that each item of Collateral that is physically delivered
to the Indenture Trustee will be held by the Indenture Trustee (or its
custodian) in trust for the benefit of the Noteholders under the terms of this
Agreement.

<PAGE>

                                   ARTICLE I
                   DEFINITIONS AND INCORPORATION BY REFERENCE

         Section 1.01. Definitions. Except as otherwise specified herein or as
the context may otherwise require, (i) capitalized terms used but not otherwise
defined herein shall have the respective meanings set forth in the Sale and
Servicing Agreement for all purposes of this Indenture and (ii) the following
terms have the respective meanings set forth below for all purposes of this
Indenture.

         Act: The meaning specified in Section 11.03(a).

         Additional Yield Maintenance Payment: For each Swap Agreement and any
Payment Date, any termination payments (excluding any Net Yield Maintenance
Payments) then payable by the Issuer to the Yield Maintenance Counterparty as a
result of an early termination of the related Swap Agreement.

         Administration Agreement: The Administration Agreement dated as of
December 1, 2003 among the Issuer, the Administrator, Wilmington Trust Company,
as owner trustee and the Depositor.

         Administrator: Deutsche Bank National Trust Company, or any successor
thereto.

         Affiliate: With respect to any specified Person, any other Person
controlling or controlled by or under common control with such specified Person.
For the purposes of this definition, "control" when used with respect to any
specified Person means the power to direct the management and policies of such
Person, directly or indirectly, whether through the ownership of voting
securities, by contract or otherwise; and the terms "controlling" and
"controlled" have meanings correlative to the foregoing.

         Authorized Officer: With respect to the Issuer, any officer of the
Owner Trustee who is authorized to act for the Owner Trustee in matters relating
to the Trust and who is identified on the list of Authorized Officers delivered
by the Owner Trustee to the Indenture Trustee on the Closing Date (as such list
may be modified or supplemented from time to time thereafter) and, so long as
the Administration Agreement is in effect, any Vice President, trust officer or
other officer of the Administrator or the Depositor who is authorized to act for
the Administrator or the Depositor in matters relating to the Trust and to be
acted upon by the Administrator or the Depositor pursuant to the Administration
Agreement and who is identified on the list of Authorized Officers delivered by
the Administrator and the Depositor to the Indenture Trustee on the Closing Date
(as such list may be modified or supplemented from time to time thereafter).

         Book-Entry Notes: A beneficial interest in any Class of Notes,
ownership and transfers of which shall be made through book entries by a
Clearing Agency as described in Section 2.09.

         Certificate of Trust: The certificate of trust of the Issuer
substantially in the form of Exhibit B to the Trust Agreement.

         Clearstream: Clearstream Banking, societe anonyme, and any successor
thereto.

                                       2
<PAGE>

         Clearing Agency: An organization registered as a "clearing agency"
pursuant to Section 17A of the Securities Exchange Act of 1934, as amended. As
of the Closing Date, the Clearing Agency shall be The Depository Trust Company.

         Clearing Agency Participant: A broker, dealer, bank, other financial
institution or other Person for which from time to time a Clearing Agency
effects book-entry transfers and pledges of securities deposited with the
Clearing Agency.

         Collateral: The meaning specified in the Granting Clause of this
Indenture.

         Commission: The Securities and Exchange Commission.

         Corporate Trust Office: The principal office of the Indenture Trustee
at which at any particular time its corporate trust business shall be
administered, which office at date of execution of this Agreement is located at
1761 East St. Andrew Place, Santa Ana, California 92705; Attention: Trust
Administration -- Thornburg 2003-6, or at such other address as the Indenture
Trustee may designate from time to time by notice to the Noteholders, and the
Issuer, or the principal corporate trust office of any successor Indenture
Trustee at the address designated by such successor Indenture Trustee by notice
to the Noteholders and the Issuer.

         Default: Any occurrence that is, or with notice or the lapse of time or
both would become, an Event of Default.

         Definitive Notes: The meaning specified in Section 2.11.

         Depository: DTC or any other Person designated by the Issuer as
Depository in the case of Book-Entry Notes.

         Depository Institution: Any depository institution or trust company,
including the Indenture Trustee, that (a) is incorporated under the laws of the
United States of America or any State thereof, (b) is subject to supervision and
examination by federal or state banking authorities and (c) has outstanding
unsecured commercial paper or other short-term unsecured debt obligations that
are rated in the highest rating category by each Rating Agency, or is otherwise
acceptable to each Rating Agency.

         DTC: The Depository Trust Company.

         ERISA: The Employee Retirement Income Security Act of 1974, as amended.

         Event of Default: As specified in Section 5.01.

         Exchange Act: The Securities Exchange Act of 1934, as amended.

         Executive Officer: With respect to any corporation, the Chief Executive
Officer, Chief Operating Officer, Chief Financial Officer, President, Executive
Vice President, any Vice President, the Secretary or the Treasurer of such
corporation; and with respect to any partnership, any general partner thereof.

                                       3
<PAGE>

         Global Securities: The meaning specified in Section 2.01.

         Grant: Mortgage, pledge, bargain, sell, warrant, alienate, remise,
release, convey, assign, transfer, create, and grant a lien upon and a security
interest in and right of set-off against, deposit, set over and confirm pursuant
to this Indenture. A Grant of the Collateral or of any other agreement or
instrument shall include all rights, powers and options (but none of the
obligations) of the granting party thereunder, including the immediate and
continuing right to claim for, collect, receive and give receipt for principal
and interest payments in respect of the Collateral and all other moneys payable
thereunder, to give and receive notices and other communications, to make
waivers or other agreements, to exercise all rights and options, to bring
Proceedings in the name of the granting party or otherwise, and generally to do
and receive anything that the granting party is or may be entitled to do or
receive thereunder or with respect thereto.

         Highest Priority Class Notes: Until the Class Principal Balances of all
Classes of Senior Notes are reduced to zero and all sums payable to the Holders
of the Senior Notes have been paid in full, the Senior Notes acting together as
if a single class; when the Class Principal Amounts of all Classes of Senior
Notes have been reduced to zero and all amounts payable to the Holders of the
Senior Notes have been paid in full, the Class M Notes.

         Holder or Noteholder: The registered holder of any Note as recorded on
the books of the Note Registrar except that, solely for the purposes of taking
any action or giving any consent pursuant to this Agreement, any Note registered
in the name of the Indenture Trustee or any Affiliate thereof shall be deemed
not to be outstanding in determining whether the requisite percentage necessary
to effect any such consent has been obtained, except that, in determining
whether the Indenture Trustee shall be protected in relying upon any such
consent, only Notes which a Responsible Officer of the Indenture Trustee knows
to be so held shall be disregarded.

         Indenture Trustee Fee: As to any Payment Date, an amount equal to
one-twelfth of the Indenture Trustee Fee Rate multiplied by the aggregate of the
Scheduled Principal Balances of all the Mortgage Loans (including Mortgage Loans
which are REO Property) as of the beginning of the related Due Period.

         Indenture Trustee Fee Rate: 0.00065% per annum.

         Independent: When used with respect to any specified Person, that such
Person (a) is in fact independent of the Issuer, any other obligor on the Notes
and any Affiliate of any of the foregoing Persons, (b) does not have any direct
financial interest or any material indirect financial interest in the Issuer,
any such other obligor or any Affiliate of any of the foregoing Persons and (c)
is not connected with the Issuer, any such other obligor or any Affiliate of any
of the foregoing Persons as an officer, employee, promoter, underwriter,
trustee, partner, director or person performing similar functions.

         Independent Certificate: A certificate or opinion to be delivered to
the Indenture Trustee under the circumstances described in, and otherwise
complying with, the applicable requirements of Section 11.01, made by an
Independent appraiser or other expert appointed by an Issuer

                                       4
<PAGE>

Order, and such opinion or certificate shall state that the signer has read the
definition of "Independent" in this Indenture and that the signer is Independent
within the meaning thereof.

         Issuer: Thornburg Mortgage Securities Trust 2003-6, or any successor
and, for purposes of any provision contained herein and required by the TIA,
each other obligor on the Notes.

         Issuer Order and Issuer Request: A written order or request signed in
the name of the Issuer by any one of its Authorized Officers and delivered to
the Indenture Trustee.

         Majority Highest Priority Class Noteholders: On any date, Holders of
the Highest Priority Class Notes representing more than 50% of the Class
Principal Amount of the Highest Priority Class Notes then outstanding.

         Non-Priority Class: As of any date of determination, any outstanding
Class of Notes other than the Highest Priority Class Notes.

         Note Depository Agreement: The agreement dated December 22, 2003, among
the Issuer, the Indenture Trustee and The Depository Trust Company, as the
initial Clearing Agency, relating to the Book-Entry Notes.

         Note Owner: With respect to a Book-Entry Note, the Person who is the
beneficial owner of such Book-Entry Note, as reflected on the books of the
Clearing Agency or on the books of a Person maintaining an account with such
Clearing Agency (directly as a Clearing Agency Participant or as an indirect
participant, in each case in accordance with the rules of such Clearing Agency).

         Note Purchase Price: For each Class of Notes and any Optional Notes
Purchase Date, an amount equal to the sum of (1) 100% of the aggregate Class
Principal Amount for such Class and such date, (2) the aggregate Current
Interest and Carryforward Interest thereon, less amounts of interest and
principal otherwise being paid to such Noteholders on such date and (3) any
unreimbursed Deferred Amounts.

         Note Register and Note Registrar: The respective meanings specified in
Section 2.03.

         Officer's Certificate: A certificate signed by any Authorized Officer
of the Issuer (or by an officer of the Depositor pursuant to the Administration
Agreement), under the circumstances described in, and otherwise complying with,
the applicable requirements of Section 11.01, and delivered to the Indenture
Trustee.

         Opinion of Counsel: One or more written opinions of counsel who may,
except as otherwise expressly provided in this Indenture, be employees of or
counsel to the Issuer and who shall be satisfactory to the Indenture Trustee,
which opinion or opinions shall be addressed to the Indenture Trustee, as
Indenture Trustee, and shall comply with any applicable requirements of Section
11.01 and shall be in form and substance satisfactory to the Indenture Trustee.

         Optional Notes Purchase Date: Any Payment Date on or after which the
aggregate Scheduled Principal Balance of the Mortgage Loans is equal to or less
than 20% of the aggregate Cut-off Date Balance.

                                       5
<PAGE>

         Optional Notes Purchase Right: The option of Thornburg or its assignee
to call the Notes on the Optional Notes Purchase Date.

         Outstanding: With respect to any Note and as of the date of
determination, any Note theretofore authenticated and delivered under this
Indenture except:

                  (i) Notes theretofore canceled by the Note Registrar or
         delivered to the Note Registrar for cancellation;

                  (ii) Notes or portions thereof the payment for which money in
         the necessary amount has been theretofore deposited with the Indenture
         Trustee or any Paying Agent in trust for the related Noteholders; and

                  (iii) Notes in exchange for or in lieu of which other Notes
         have been authenticated and delivered pursuant to this Indenture unless
         proof satisfactory to the Indenture Trustee is presented that any such
         Notes are held by a bona fide purchaser; provided, that in determining
         whether the Holders of the requisite Outstanding Amount of the Notes
         have given any request, demand, authorization, direction, notice,
         consent, or waiver hereunder or under any other Operative Agreement,
         Notes owned by the Issuer, any other obligor upon the Notes or any
         Affiliate of any of the foregoing Persons shall be disregarded and
         deemed not to be Outstanding, except that, in determining whether the
         Indenture Trustee shall be protected in relying upon any such request,
         demand, authorization, direction, notice, consent, or waiver, only
         Notes that a Responsible Officer of the Indenture Trustee has actual
         knowledge to be so owned shall be so disregarded. Notes so owned that
         have been pledged in good faith may be regarded as Outstanding if the
         pledgee establishes to the satisfaction of the Indenture Trustee the
         pledgee's right so to act with respect to such Notes and that the
         pledgee is not the Issuer, any other obligor upon the Notes or any
         Affiliate of any of the foregoing Persons.

         Outstanding Amount: The aggregate of the Note Principal Amounts of all
Notes, or of all Notes of a Class, as applicable, Outstanding at the date of
determination.

         Percentage Interest: As defined in the Trust Agreement.

         Predecessor Note: With respect to any particular Note, every previous
Note evidencing all or a portion of the same debt as that evidenced by such
particular Note; and, for the purpose of this definition, any Note authenticated
and delivered under Section 2.04 in lieu of a mutilated, lost, destroyed or
stolen Note shall be deemed to evidence the same debt as the mutilated, lost,
destroyed or stolen Note.

         Rating: The rating assigned to a Class of Notes by a Rating Agency
(which shall initially be the Required Rating), as evidenced by a letter from
such Rating Agency.

         Rating Agency Condition: With respect to any action to which the Rating
Agency Condition applies, that each Rating Agency shall have been given 10 days
(or such shorter period acceptable to the applicable Rating Agency) prior notice
of any action to which the Rating Agency Condition applies and that such Rating
Agency shall have notified the Depositor, the Owner Trustee, the Indenture
Trustee and the Administrator in writing that such proposed action

                                       6
<PAGE>

will not result in a reduction or withdrawal of the then current rating of the
applicable Class or Classes of Notes (if then rated).

         Redemption Date: In the case of a redemption of the Notes pursuant to
Section 10.01(b) hereof, the Payment Date specified by the Indenture Trustee
pursuant to Section 10.02.

         Redemption Price: For each Class of Notes, an amount equal to the sum
of (1) 100% of the aggregate Class Principal Amount for such Class, (2) the
aggregate Current Interest and Carryforward Interest thereon and (3) any
unreimbursed Deferred Amounts.

         Registered Holder: The Person in whose name a Note is registered on the
Note Register on the applicable Record Date.

         Registered Notes: Those Notes which are in registered form. Each of the
Notes will be registered Notes.

         Required Rating: The Notes have received, on the Closing Date, the
following ratings from the Rating Agencies:

<Table>
<Caption>
                                   Moody's
                       Class       Rating      S&P Rating
                       -----       ------      ----------
<S>                    <C>         <C>         <C>
                        A-1         Aaa            AAA
                        A-2         N/R            AAA
                        M           N/R            AA
</Table>

         Sale and Servicing Agreement: The Sale and Servicing Agreement dated as
of December 1, 2003, among the Issuer, the Seller, the Depositor, the Indenture
Trustee and the Master Servicer, as such agreement may be amended or
supplemented from time to time.

         State: Any one of the 50 States of the United States of America or the
District of Columbia.

         Trust Certificate: As defined in the Trust Agreement.

         Trust Indenture Act or TIA: The Trust Indenture Act of 1939 as in force
on the date hereof, unless otherwise specifically provided.

         United States: The United States of America.

         U.S. Person: A citizen or resident of the United States, a corporation,
partnership or other entity created or organized in or under the laws of the
United States or any State (other than a partnership that is not treated as a
U.S. Person under any applicable Treasury regulations), or an estate whose
income is subject to United States federal income tax regardless of its source,
or a trust if a court within the United States is able to exercise primary
supervision over the administration of the trust and one or more U.S. Persons
have the authority to control all substantial decisions of the trust.
Notwithstanding the preceding sentence, to the extent provided in Treasury
regulations, certain trusts in existence on August 20, 1996 and treated as U.S.

                                       7
<PAGE>

Persons prior to such date that elect to continue to be treated as U.S. Persons
also will be U.S. Persons.

         Section 1.02. Incorporation by Reference of Trust Indenture Act.

         (a) Whenever this Indenture refers to a provision of the TIA, the
provision is incorporated by reference in and made a part of this Indenture. The
following TIA terms used in this Indenture have the following meanings:

         "Commission" means the Securities and Exchange Commission

         "indenture securities" means the Notes.

         "indenture security holder" means a Noteholder.

         "indenture to be qualified" means this Indenture.

         "indenture trustee" or "institutional trustee" means the Indenture
Trustee.

         "obligor" on the indenture securities means the Issuer and any other
obligor on the indenture securities.

         (b) All other TIA terms used in this Indenture that are defined in the
TIA, defined by TIA reference to another statute or defined by rule of the
Securities and Exchange Commission have the respective meanings assigned to them
by such definitions.

         Section 1.03. Rules of Construction. Unless the context otherwise
requires:

                  (i) a term has the meaning assigned to it;

                  (ii) an accounting term not otherwise defined has the meaning
         assigned to it in accordance with generally accepted accounting
         principles as in effect from time to time;

                  (iii) "or" is not exclusive;

                  (iv) "including" means including without limitation;

                  (v) words in the singular include the plural and words in the
         plural include the singular;

                  (vi) any agreement, instrument or statute defined or referred
         to herein or in any instrument or certificate delivered in connection
         herewith means such agreement, instrument or statute as from time to
         time amended, modified or supplemented (as provided in such agreements)
         and includes (in the case of agreements or instruments) references to
         all attachments thereto and instruments incorporated therein;
         references to a Person are also to its permitted successors and
         assigns; and

                  (vii) terms defined in the UCC and not otherwise defined
         herein shall have the meaning assigned to them in the UCC; and

                                       8
<PAGE>

                  (viii) "U.S. dollars," "dollars," or the sign "$" shall be
         construed as references to United States dollars which are freely
         transferable by residents and non-residents of the United States of
         America and convertible by such persons into any other freely
         convertible currency unless such transferability or convertibility is
         restricted by any law or regulation of general application in which
         event references to "U.S. dollars," "dollars," or the sign "$" shall be
         construed as references to such coin or currency of the United States
         of America as at the time of payment shall be legal tender for the
         payment of public and private debts in the United States of America,
         and "cents" shall be construed accordingly.

                                   ARTICLE II
                                    THE NOTES

         Section 2.01. Form. The Notes shall be designated as the "Thornburg
Mortgage Securities Trust 2003-6 Mortgage-Backed Notes, Series 2003-6." Each
Class of Notes, together with the Indenture Trustee's certificate of
authentication, shall be in substantially the forms set forth in Exhibit A, with
such appropriate insertions, omissions, substitutions and other variations as
are required or permitted by this Indenture, and may have such letters, numbers
or other marks of identification and such legends or endorsements placed thereon
as may, consistently herewith, be determined by the officers executing such
Notes, as evidenced by their execution thereof. Any portion of the text of any
Note may be set forth on the reverse thereof, with an appropriate reference
thereto on the face of the Note.

         The Definitive Notes and the global certificates ("Global Securities")
representing the Book-Entry Notes shall be typewritten, printed, lithographed or
engraved or produced by any combination of these methods (with or without steel
engraved borders), all as determined by the officers executing such Notes, as
evidenced by their execution of such Notes.

         The Notes shall be issued as registered Notes. Each Class of Notes,
except as otherwise provided by supplement to this Indenture, shall be issued in
a denomination of at least $25,000 in principal amount and any larger
denomination that is an integral multiple of $1 approved by the Issuer, such
approval to be evidenced by the execution thereof; provided, however, one Note
may be issued in an amount less than the minimum denomination. If the Notes are
issuable in whole or in part as Book-Entry Notes, any such Note may provide that
it shall represent the aggregate amount of Outstanding Notes from time to time
endorsed thereon and may provide that the aggregate amount of Outstanding Notes
represented thereby may from time to time be reduced to reflect exchanges or
increased to reflect the issuance of an additional principal amount of Notes.
Any endorsement of a Book-Entry Note to reflect the amount, or any increase or
decrease in the amount, of Outstanding Notes represented thereby shall be made
in such manner and by such Person or Persons, as shall be specified therein or
in the Issuer Order of authentication delivered to the Indenture Trustee.

         The terms of the Notes set forth in Exhibit A are part of the terms of
this Indenture.

         Section 2.02. Execution, Authentication, Delivery and Dating. The Notes
shall be executed on behalf of the Issuer by an Authorized Officer of the Owner
Trustee or the

                                       9
<PAGE>

Administrator. The signature of any such Authorized Officer on the Notes may be
manual or facsimile.

         Notes bearing the manual or facsimile signature of individuals who were
at any time Authorized Officers of the Owner Trustee or the Administrator shall
bind the Issuer, notwithstanding that such individuals or any of them have
ceased to hold such offices prior to the authentication and delivery of such
Notes or did not hold such offices at the date of such Notes.

         Subject to the satisfaction of the conditions set forth in Section 2.08
hereof, the Indenture Trustee shall, upon Issuer Order, authenticate and deliver
the Notes for original issue in the aggregate principal amounts with respect to
each Class as specified below:

<Table>
<Caption>
                        Class      Class Principal Amount
                        -----      ----------------------
<S>                                <C>
                         A-1           $1,013,208,000
                         A-2           $   54,038,000
                         M             $   13,510,000
</Table>

The aggregate principal amounts of such Classes of Notes outstanding at any time
may not exceed such respective amounts.

         The Notes that are authenticated and delivered by the Indenture Trustee
to or upon the order of the Issuer on the Closing Date shall be dated the
Closing Date. All other Notes that are authenticated after the Closing Date as a
result of transfer or exchange or for any other purpose under the Indenture
shall be dated the date of their authentication.

         No Note shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose, unless there appears on such Note a
certificate of authentication (substantially in the form provided for in the
forms of Notes at Exhibit A) executed by the Indenture Trustee by the manual
signature of one of its authorized signatories, and such certificate upon any
Note shall be conclusive evidence, and the only evidence, that such Note has
been duly authenticated and delivered hereunder.

         Section 2.03. Registration; Registration of Transfer and Exchange. The
Issuer shall cause to be kept a register (the "Note Register") in which, subject
to such reasonable regulations as it may prescribe, the Issuer shall provide for
the registration of Notes and the registration of transfers of Notes. The
Indenture Trustee initially shall be the "Note Registrar" for the purpose of
registering Notes and transfers of Notes as herein provided. Upon any
resignation of any Note Registrar, the Issuer shall promptly appoint a successor
or, if it elects not to make such an appointment, assume the duties of Note
Registrar.

         If a Person other than the Indenture Trustee is appointed by the Issuer
as Note Registrar, the Issuer will give the Indenture Trustee prompt written
notice of the appointment of such Note Registrar and of the location, and any
change in the location, of the Note Register, and the Indenture Trustee shall
have the right to inspect the Note Register at all reasonable times and to
obtain copies thereof, and the Indenture Trustee shall have the right to rely
upon a certificate executed on behalf of the Note Registrar by an Executive
Officer thereof as to the names and addresses of the Holders of the Notes and
the principal amounts and number of such Notes.

                                       10
<PAGE>

         Upon surrender for registration of transfer of any Note at the office
or agency of the Issuer to be maintained as provided in Section 3.02, the Issuer
shall execute, and the Indenture Trustee shall authenticate and the Noteholder
shall be entitled to obtain from the Indenture Trustee, in the name of the
designated transferee or transferees, one or more new Notes of the same Class in
any authorized denominations, of a like aggregate principal amount. At the
option of the Holder, Notes may be exchanged for other Notes of the same Class
in any authorized denominations, of a like aggregate principal amount, upon
surrender of the Notes to be exchanged at such office or agency. Whenever any
Notes are so surrendered for exchange, the Issuer shall execute, and the
Indenture Trustee shall authenticate and the Noteholder shall be entitled to
obtain from the Indenture Trustee, the Notes which the Noteholder making the
exchange is entitled to receive.

         Except for a transfer made to Thornburg or to an affiliate of
Thornburg, no transfer of a Note in the form of a Definitive Note shall be made
unless the Note Registrar shall have received a representation from the
transferee of such Note, acceptable to and in form and substance satisfactory to
the Note Registrar and the Depositor (such requirement is satisfied only by the
Note Registrar's receipt of a transfer affidavit from the transferee
substantially in the form of Exhibit B hereto), to the effect that such
transferee (i) is not acquiring such Note for, or with the assets of, an
employee benefit plan or other retirement arrangement that is subject to Section
406 of ERISA or Section 4975 of the Code or any substantially similar law
("Similar Law"), or any entity deemed to hold the plan assets of the foregoing
(collectively, "Benefit Plans"), or (ii) its acquisition and holding of such
Note for, or with the assets of, a Benefit Plan will not result in a non-exempt
prohibited transaction under Section 406 of ERISA or Section 4975 of the Code
which is not covered under Prohibited Transaction Class Exemption ("PTCE")
84-14, PTCE 90-1, PTCE 91-38, PTCE 95-60, PTCE 96-23 or some other applicable
exemption, and will not result in a non-exempt violation of any Similar Law.

         In the case of a Note that is a Book-Entry Note, for purposes of
clauses (i) or (ii) of the first sentence of the preceding paragraph, such
representations shall be deemed to have been made to the Note Registrar by the
transferee's acceptance of such Note that is also a Book-Entry Note (or the
acceptance by a Note Holder of the beneficial interest in such Note).

         To the extent permitted under applicable law (including, but not
limited to, ERISA), neither the Indenture Trustee nor the Note Registrar shall
have any liability to any Person for any registration of transfer of any Note
that is in fact not permitted by this Section 2.03 or for making any payments
due on such Note to the Holder thereof or taking any other action with respect
to such Holder under the provisions of this Agreement. In addition, neither the
Indenture Trustee nor the Note Registrar shall be required to monitor, determine
or inquire as to compliance with the transfer restrictions with respect to any
Note in the form of a Book-Entry Note, and neither the Indenture Trustee nor the
Note Registrar shall have any liability for transfers of a Book-Entry Note or
any interest therein made in violation of the restrictions on transfer described
in the Prospectus Supplement and this Agreement.

         All Notes issued upon any registration of transfer or exchange of Notes
shall be the valid obligations of the Issuer, evidencing the same debt, and
entitled to the same benefits under this Indenture, as the Notes surrendered
upon such registration of transfer or exchange.

                                       11
<PAGE>

         Any Note presented or surrendered for registration of transfer or
exchange shall be duly endorsed by, or be accompanied by a written instrument of
transfer in form satisfactory to the Indenture Trustee duly executed by, the
Holder thereof or such Holder's attorney duly authorized in writing, with such
signature guaranteed by an "eligible guarantor institution" meeting the
requirements of the Note Registrar, which requirements include membership or
participation in the Securities Transfer Agent's Medallion Program ("STAMP") or
such other "signature guarantee program" as may be determined by the Note
Registrar in addition to, or in substitution for, STAMP, all in accordance with
the Exchange Act.

         No service charge shall be made to a Noteholder for any registration of
transfer or exchange of Notes, but the Issuer or the Note Registrar may require
payment of a sum sufficient to cover any tax or other governmental charge that
may be imposed in connection with any registration of transfer or exchange of
Notes, other than exchanges pursuant to Section 2.04 or Section 9.06 not
involving any transfer.

         The preceding provisions of this Section notwithstanding, the Issuer
shall not be required to make and the Note Registrar need not register transfers
or exchanges of Notes for a period of 15 days preceding the Payment Date for any
payment with respect to such Note.

         Section 2.04. Mutilated, Destroyed, Lost or Stolen Notes. If (i) any
mutilated Note is surrendered to the Indenture Trustee, or the Indenture Trustee
receives evidence to its satisfaction of the destruction, loss or theft of any
Note, and (ii) there is delivered to the Indenture Trustee such security or
indemnity as may be required by it to hold the Issuer and the Indenture Trustee
harmless, then, in the absence of notice to the Issuer, the Note Registrar or
the Indenture Trustee that such Note has been acquired by a bona fide purchaser,
the Issuer shall execute, and upon its request the Indenture Trustee shall
authenticate and deliver, in exchange for or in lieu of any such mutilated,
destroyed, lost or stolen Note, a replacement Note of the same Class; provided,
however, that if any such destroyed, lost or stolen Note, but not a mutilated
Note, shall have become or within seven days shall be due and payable, instead
of issuing a replacement Note, the Issuer may pay such destroyed, lost or stolen
Note when so due or payable without surrender thereof. If, after the delivery of
such replacement Note or payment of a destroyed, lost or stolen Note pursuant to
the proviso to the preceding sentence, a bona fide purchaser of the original
Note in lieu of which such replacement Note was issued presents for payment such
original Note, the Issuer and the Indenture Trustee shall be entitled to recover
such replacement Note (or such payment) from the Person to whom it was delivered
or any Person taking such replacement Note from such Person to whom such
replacement Note was delivered or any assignee of such Person, except a bona
fide purchaser, and shall be entitled to recover upon the security or indemnity
provided therefor to the extent of any loss, damage, cost or expense incurred by
the Issuer or the Indenture Trustee in connection therewith.

         Upon the issuance of any replacement Note under this Section, the
Issuer may require the payment by the Holder of such Note of a sum sufficient to
cover any tax or other governmental charge that may be imposed in relation
thereto and any other reasonable expenses (including the fees and expenses of
the Indenture Trustee) connected therewith.

         Every replacement Note issued pursuant to this Section in replacement
of any mutilated, destroyed, lost or stolen Note shall constitute an original
additional contractual obligation of the

                                       12
<PAGE>

Issuer, whether or not the mutilated, destroyed, lost or stolen Note shall be at
any time enforceable by anyone, and shall be entitled to all the benefits of
this Indenture equally and proportionately with any and all other Notes duly
issued hereunder.

         The provisions of this Section are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Notes.

         Section 2.05. Persons Deemed Owners. Prior to due presentment for
registration of transfer of any Note, the Issuer, the Indenture Trustee and any
agent of the Issuer or the Indenture Trustee may treat the Person in whose name
any Note is registered (as of the day of determination) as the owner of such
Note for the purpose of receiving payments of principal of and interest, if any,
on such Note and for all other purposes whatsoever, whether or not such Note be
overdue, and none of the Issuer, the Indenture Trustee or any agent of the
Issuer or the Indenture Trustee shall be affected by notice to the contrary.

         Section 2.06. Payment of Principal and Interest. (a) Each Class of
Notes shall accrue interest at the Note Interest Rate as set forth in the Sale
and Servicing Agreement, and such interest shall be payable on each Payment
Date, subject to Section 3.01. Interest shall be computed on each Class of Notes
on the basis of a 360-day year consisting of twelve 30-day months. With respect
to each outstanding Class of Notes, the Master Servicer shall determine LIBOR
for each applicable Accrual Period on the second London Business Day prior
thereto, in accordance with the provisions of the Sale and Servicing Agreement.
All interest payments on each Class of Notes shall be made pro rata to the
Noteholders of such Class entitled thereto. Any installment of interest or
principal payable on any Note shall be paid on the applicable Payment Date to
the Person in whose name such Note (or one or more Predecessor Notes) is
registered on the Record Date by check mailed first-class postage prepaid to
such Person's address as it appears on the Note Register on such Record Date or,
upon written request made to the Indenture Trustee at least five Business Days
prior to the related Record Date, by the Holder of a Note by wire transfer in
immediately available funds to an account specified in the request and at the
expense of such Noteholder, except that, unless Definitive Notes have been
issued pursuant to Section 2.11, with respect to Notes registered on the Record
Date in the name of the nominee of the Clearing Agency (initially, such nominee
to be Cede & Co.), payment will be made by wire transfer in immediately
available funds to the account designated by such nominee, except for the final
installment of principal payable with respect to such Note on a Payment Date or
on the applicable Maturity Date for such Class of Notes (and except for the
Redemption Price for any Note being redeemed pursuant to Section 10.01(b) hereof
or the Note Purchase Price for any Note being purchased pursuant to the Optional
Notes Purchase Right pursuant to Section 10.01(a) hereof), which shall be
payable as provided below. The funds represented by any such checks returned
undelivered shall be held in accordance with Section 3.03.

         The principal of each Note shall be payable in installments on each
Payment Date as provided in the Sale and Servicing Agreement and in the forms of
the Notes set forth in Exhibit A hereto. Notwithstanding the foregoing, the
entire unpaid principal amount of a Class of Notes, together with unpaid
Deferred Amounts, shall be due and payable, if not previously paid, on the
earlier of (i) the applicable Maturity Date, (ii) the applicable Redemption
Date, (iii) following an Optional Termination pursuant to Section 7.03 of the
Sale and Servicing Agreement, or (iv) the

                                       13
<PAGE>

date on which an Event of Default shall have occurred and be continuing, if the
Indenture Trustee or the Majority Highest Priority Class Noteholders shall have
declared the Notes to be immediately due and payable in the manner provided in
Section 5.02 hereof. In addition, if the Optional Notes Purchase Right is
exercised, and the Note Purchase Price in connection therewith is provided to
the Indenture Trustee in accordance with Section 10.01 hereof, the then Holder
of the Notes shall also receive its proportionate share of the Note Purchase
Price as provided in Section 10.01 hereof.

         On each Payment Date, all principal payments on each Class of Notes
shall be made pro rata to the Noteholders of such Class entitled thereto based
on their respective Note Principal Amounts immediately prior to such Payment
Date. The Indenture Trustee shall notify the Person in whose name a Note is
registered at the close of business on the Record Date preceding the Payment
Date on which the Issuer expects that the final installment of principal of and
interest on such Note will be paid. Such notice shall be mailed or transmitted
by facsimile prior to such final Payment Date and shall specify that such final
installment will be payable only upon presentation and surrender of such Note
and shall specify the place where such Note may be presented and surrendered for
payment of such installment. Notices in connection with redemptions of Notes or
the exercise of the Optional Notes Purchase Right shall be mailed to Noteholders
as provided in Section 10.02 hereof.

         Section 2.07. Cancellation. All Notes surrendered for payment,
registration of transfer or exchange shall, if surrendered to any Person other
than the Indenture Trustee, be delivered to the Indenture Trustee and shall be
promptly canceled by the Indenture Trustee. The Issuer shall deliver to the
Indenture Trustee for cancellation any Notes previously authenticated and
delivered hereunder which the Issuer may have acquired in any manner whatsoever,
and all Notes so delivered shall be promptly canceled by the Indenture Trustee.
No Notes shall be authenticated in lieu of or in exchange for any Notes canceled
as provided in this Section, except as expressly permitted by this Indenture.
All canceled Notes may be held or disposed of by the Indenture Trustee in
accordance with its standard retention or disposal policy as in effect at the
time unless the Issuer shall direct by an Issuer Order that they be destroyed or
returned to it; provided, that such Issuer Order is timely and the Notes have
not been previously disposed of by the Indenture Trustee.

         Section 2.08. Authentication of Notes.

         (a) The Notes shall be authenticated by the Indenture Trustee, upon
Issuer Request and upon receipt by the Indenture Trustee of the following:

                  (i) An Issuer Order authorizing the execution and
         authentication of such Notes;

                  (ii) All of the items of Collateral that are to be delivered
         to the Indenture Trustee or its designee;

                  (iii) An executed counterpart of the Trust Agreement, the
         Indenture, the Administration Agreement, and the Sale and Servicing
         Agreement and an executed original of the Trust Certificate and the
         Certificate of Trust;

                                       14
<PAGE>

                  (iv) Except to the extent provided in subsection (b) below,
         Opinions of Counsel addressed to the Indenture Trustee to the effect
         that:

                                    (A) the Issuer has been duly formed and is
                           validly existing as a statutory trust under the laws
                           of the State of Delaware, and has power, authority
                           and legal right to execute and deliver this Indenture
                           and the other Operative Agreements to which it is a
                           party;

                                    (B) the issuance of the Notes has been duly
                           and validly authorized by the Issuer;

                                    (C) the Notes, when executed and
                           authenticated in accordance with the provisions of
                           this Indenture and delivered against payment
                           therefor, will be the legal, valid and binding
                           obligations of the Issuer pursuant to the terms of
                           this Indenture and will be entitled to the benefits
                           of this Indenture, and will be enforceable in
                           accordance with their terms, subject to bankruptcy,
                           insolvency, reorganization, arrangement, moratorium,
                           fraudulent or preferential conveyance and other
                           similar laws of general application affecting the
                           rights of creditors generally and to general
                           principles of equity (regardless of whether such
                           enforcement is considered in a proceeding in equity
                           or at law);

                                    (D) all conditions precedent provided for in
                           this Indenture relating to the authentication of the
                           Notes have been complied with;

                                    (E) assuming due authorization, execution
                           and delivery thereof by the Indenture Trustee, this
                           Indenture has been duly executed and delivered by
                           Issuer and constitutes the legal, valid and binding
                           obligation of the Issuer, enforceable against the
                           Issuer in accordance with its terms, subject to
                           bankruptcy, insolvency, reorganization, arrangement,
                           moratorium, fraudulent or preferential conveyance and
                           other similar laws of general application affecting
                           the rights of creditors generally and to general
                           principles of equity (regardless of whether such
                           enforcement is considered in a proceeding in equity
                           or at law);

                                    (F) the Issuer is not required to be
                           registered under the Investment Company Act of 1940,
                           as amended;

                                    (G) the Issuer will not be characterized as
                           an association (or publicly traded partnership)
                           taxable as a corporation;

                                    (H) the provisions of the Indenture are
                           sufficient to create a valid security interest in
                           favor of the Indenture Trustee in the Collateral; and

                                    (I) this Indenture has been duly qualified
                           under the Trust Indenture Act.

                                       15
<PAGE>

                  (v) An Officer's Certificate of the Depositor on behalf of the
         Issuer complying with the requirements of Section 11.01 and stating
         that:

                                    (A) the Issuer is not in Default under this
                           Indenture and the issuance of the Notes will not
                           result in any breach of any of the terms, conditions
                           or provisions of, or constitute a default under, any
                           indenture, mortgage, deed of trust or other agreement
                           or instrument to which the Issuer is a party or by
                           which it is bound, or any order of any court or
                           administrative agency entered in any proceeding to
                           which the Issuer is a party or by which it may be
                           bound or to which it may be subject;

                                    (B) any form UCC-1 filed or to be filed
                           against the Issuer for the benefit of the Indenture
                           Trustee with respect to the Collateral, shall contain
                           a statement that a purchaser of a security interest
                           in any Collateral described in such financing
                           statement will violate the rights of the Indenture
                           Trustee, as secured party, in such Collateral,

                                    (C) attached thereto are true and correct
                           copies of letters signed by the Rating Agencies to
                           the effect that each Class of Notes being rated by it
                           has been assigned the Required Rating; and

                                    (D) all conditions precedent provided for in
                           this Indenture relating to the authentication and
                           delivery of the Notes have been complied with.

         (b) The representations and warranties made pursuant to the foregoing
Officer's Certificate shall survive the discharge of this Indenture and may not
be waived by any party hereto. The Opinions of Counsel to be delivered pursuant
to subsection (a)(iv) above may differ from the Opinions of Counsel described in
such subsection so long as such Opinions of Counsel so delivered are acceptable
to the Rating Agencies and the Indenture Trustee, which shall be conclusively
evidenced by Indenture Trustee's authentication and delivery of the Notes and
the Rating Agencies' issuance of their letters pursuant to subsection (a)(v)(B)
above and such acceptable opinions shall be deemed to be the Opinions of Counsel
required pursuant to subsection (a)(iv) above.

         Section 2.09. Book-Entry Notes. Each Class of Notes will be issued in
the form of typewritten Notes or Global Securities representing the Book-Entry
Notes, to be delivered to DTC, the initial Clearing Agency, by, or on behalf of,
the Issuer. The Book-Entry Notes shall be registered initially on the Note
Register in the name of Cede & Co., the nominee of DTC, and no owner thereof
will receive a definitive Note representing such Note Owner's interest in such
Note, except as provided in Section 2.11. Unless and until definitive, fully
registered Notes (the "Definitive Notes") have been issued to such Note Owners
pursuant to Section 2.11:

                  (i) the provisions of this Section shall be in full force and
         effect;

                  (ii) the Note Registrar and the Indenture Trustee shall be
         entitled to deal with the Clearing Agency for all purposes of this
         Indenture (including the payment of principal of and interest on the
         Notes and the giving of instructions or directions

                                       16
<PAGE>

         hereunder) as the sole Holder of the Notes, and shall have no
         obligation to the Note Owners;

                  (iii) to the extent that the provisions of this Section
         conflict with any other provisions of this Indenture, the provisions of
         this Section shall control;

                  (iv) the rights of Note Owners shall be exercised only through
         the Clearing Agency and shall be limited to those established by law
         and agreements between such Note Owners and the Clearing Agency and/or
         the Clearing Agency Participants pursuant to the Note Depository
         Agreement. Unless and until Definitive Notes are issued pursuant to
         Section 2.11, the initial Clearing Agency will make Book-Entry
         transfers among the Clearing Agency Participants and receive and
         transmit payments of principal of and interest on the Notes to such
         Clearing Agency Participants; and

                  (v) whenever this Indenture requires or permits actions to be
         taken based upon instructions or directions of Holders of Notes
         evidencing a specified percentage of the Outstanding Amount of the
         Notes, the Clearing Agency shall be deemed to represent such percentage
         only to the extent that it has received instructions to such effect
         from Note Owners and/or Clearing Agency Participants owning or
         representing, respectively, such required percentage of the beneficial
         interest in the Notes and has delivered such instructions to the
         Indenture Trustee.

         Section 2.10. Notices to Clearing Agency. Whenever a notice or other
communication to the Noteholders is required under this Indenture, unless and
until Definitive Notes shall have been issued to such Note Owners pursuant to
Section 2.11, the Indenture Trustee shall give all such notices and
communications specified herein to be given to Holders of the Notes to the
Clearing Agency, and shall have no obligation to such Note Owners.

         Section 2.11. Definitive Notes. If (i) DTC or the Depositor advises the
Indenture Trustee in writing that the Clearing Agency is no longer willing or
able to properly discharge its responsibilities with respect to the Book-Entry
Notes and the Depositor or the Indenture Trustee is unable to locate a qualified
successor, (ii) the Issuer at its option (and with the consent of the Indenture
Trustee) advises the Indenture Trustee in writing that it elects to terminate
the Book-Entry system through the Clearing Agency or (iii) after the occurrence
of an Event of Default, Owners of the Book-Entry Notes representing beneficial
interests aggregating at least a majority of the Outstanding Amount of
Book-Entry Notes advise the Clearing Agency in writing that the continuation of
a Book-Entry system through the Clearing Agency is no longer in the best
interests of such Note Owners, then the Clearing Agency shall notify all Note
Owners and the Indenture Trustee of the occurrence of such event and of the
availability of Definitive Notes to Note Owners requesting the same. Upon
surrender to the Indenture Trustee of the typewritten Notes representing the
Book-Entry Notes by the Clearing Agency, accompanied by registration
instructions, the Issuer shall execute and the Indenture Trustee shall
authenticate the Definitive Notes in accordance with the instructions of the
Clearing Agency. None of the Issuer, the Note Registrar or the Indenture Trustee
shall be liable for any delay in delivery of such instructions and may
conclusively rely on, and shall be protected in relying on, such instructions.
Upon the issuance of Definitive Notes, the Indenture Trustee shall recognize the
Holders of the Definitive Notes as Noteholders.

                                       17
<PAGE>

         Section 2.12. Tax. The Issuer has entered into this Indenture, and the
Notes will be issued, with the intention that, for federal, state and local
income, business and franchise tax purposes, the Notes will qualify as
indebtedness secured by the Collateral (except that any Note held by a person
that, for federal income tax purposes, owns or is treated as owning a 100%
Percentage Interest of the Trust Certificate shall not be treated as outstanding
indebtedness for such purposes). The Issuer, by entering into this Indenture,
and each Noteholder, by its acceptance of a Note (and each Note Owner by its
acceptance of an interest in the applicable Book-Entry Note), agree to treat the
Notes for federal, state and local income, single business and franchise tax
purposes in a manner consistent with this intention.

                                  ARTICLE III
                                    COVENANTS

         Section 3.01. Payment of Principal and Interest. The Issuer will duly
and punctually pay (or will cause to be duly and punctually paid) the principal
of and interest on the Notes in accordance with the terms of the Notes and this
Indenture. Without limiting the foregoing, unless the Notes have been declared
due and payable pursuant to Section 5.02 and monies collected by the Indenture
Trustee are being applied in accordance with Section 5.04(b), subject to and in
accordance with Section 8.02, the Issuer will cause to be paid amounts on
deposit in the Note Account on each Payment Date, pursuant to the Sale and
Servicing Agreement and to the extent provided by Section 5.06 thereof, to the
Holders of each Class of Notes. Amounts properly withheld under the Code by any
Person from a payment to any Noteholder of interest and/or principal shall be
considered as having been paid by the Issuer to such Noteholder for all purposes
of this Indenture.

         The Notes shall be non-recourse obligations of the Issuer and shall be
limited in right of payment to amounts available from the Collateral as provided
in this Indenture. The Issuer shall not otherwise be liable for payments of the
Notes, and none of the owners, agents, officers, directors, employees, trustees
or successors or assigns of the Issuer shall be personally liable for any
amounts payable, or performance due, under the Notes or this Indenture. If any
other provision of this Indenture shall be deemed to conflict with the
provisions of this Section 3.01, the provisions of this Section 3.01 shall
control.

         Section 3.02. Maintenance of Office or Agency. The Issuer will or will
cause the Indenture Trustee to maintain in New York, New York, an office or
agency where Notes may be surrendered for registration of transfer or exchange.
As of the Closing Date, the Indenture Trustee designates the following office
for such purposes: c/o DTC Transfer Agent Services, 55 Water Street, Jeanette
Park Entrance, New York, New York 10041. Notices to or upon the Issuer in
respect of the Notes and this Indenture may be delivered to the Corporate Trust
Office. The Issuer hereby initially appoints the Indenture Trustee to serve as
its agent for the foregoing purposes and to serve as Paying Agent with respect
to the Notes. The Issuer will give prompt written notice to the Indenture
Trustee of the appointment of new or additional paying agents for the Notes, the
location, and of any change in the location, of any such office or agency. If at
any time the Issuer shall fail to maintain any such office or agency or shall
fail to furnish the Indenture Trustee with the address thereof, such notices and
demands may be made or delivered to the Corporate Trust Office, and the Issuer
hereby appoints the Indenture Trustee as its agent to receive all such notices
and demands.

                                       18
<PAGE>

         Section 3.03. Money for Payments To Be Held in Trust. All payments of
amounts due and payable with respect to any Notes that are to be made from
amounts withdrawn from the Note Account, pursuant to Article V of the Sale and
Servicing Agreement shall be made on behalf of the Issuer by the Indenture
Trustee or by the Paying Agent.

         On or before the Business Day preceding each Payment Date, the Issuer
shall deposit or cause to be deposited in the Note Account an aggregate sum
sufficient to pay the amounts then becoming due under the Notes, such sum to be
held in trust for the benefit of the Persons entitled thereto, and (unless the
Paying Agent is the Indenture Trustee) shall promptly notify the Indenture
Trustee of its action or failure so to act.

         Any Paying Agent other than the Indenture Trustee shall be appointed by
Issuer Order with written notice thereof to the Indenture Trustee. Any Paying
Agent appointed by the Issuer shall be a Person who would be eligible to be
Indenture Trustee hereunder as provided in Section 6.11. The Issuer shall not
appoint any Paying Agent (other than the Indenture Trustee) which is not, at the
time of such appointment, a Depository Institution.

         The Issuer will cause each Paying Agent (other than the Indenture
Trustee) to execute and deliver to the Indenture Trustee an instrument in which
such Paying Agent shall agree with the Indenture Trustee (and if the Indenture
Trustee acts as Paying Agent, it hereby so agrees), subject to the provisions of
this Section, that such Paying Agent will:

                  (i) hold all sums held by it for the payment of amounts due
         with respect to the Notes in trust for the benefit of the Persons
         entitled thereto until such sums shall be paid to such Persons or
         otherwise disposed of as herein provided and pay such sums to such
         Persons as herein provided;

                  (ii) give the Indenture Trustee notice of any default by the
         Issuer (or any other obligor upon the Notes) of which it has actual
         knowledge in the making of any payment required to be made with respect
         to the Notes;

                  (iii) at any time during the continuance of any such default,
         upon the written request of the Indenture Trustee, forthwith pay to the
         Indenture Trustee all sums so held in trust by such Paying Agent;

                  (iv) immediately resign as a Paying Agent and forthwith pay to
         the Indenture Trustee all sums held by it in trust for the payment of
         Notes if at any time it ceases to meet the standards required to be met
         by a Paying Agent at the time of its appointment; and

                  (v) comply with all requirements of the Code with respect to
         the withholding from any payments made by it on any Notes of any
         applicable withholding taxes imposed thereon and with respect to any
         applicable reporting requirements in connection therewith; provided,
         however, that with respect to withholding and reporting requirements
         applicable to original issue discount (if any) on the Notes, the Issuer
         shall have first provided the calculated amounts pertaining thereto to
         the Indenture Trustee.

                                       19
<PAGE>

         The Issuer may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, by Issuer
Order direct any Paying Agent to pay to the Indenture Trustee all sums held in
trust by such Paying Agent, such sums to be held by the Indenture Trustee upon
the same trusts as those upon which the sums were held by such Paying Agent.
Upon such payment by any Paying Agent to the Indenture Trustee, such Paying
Agent shall be released from all further liability with respect to such money.

         Subject to applicable laws with respect to escheat of funds or
abandoned property, any money held by the Indenture Trustee or any Paying Agent
in trust for the payment of any amount due with respect to any Note and
remaining unclaimed for two years after such amount has become due and payable
shall be discharged from such trust and be paid to the Issuer on Issuer Request;
and the Holder of such Note shall thereafter, as an unsecured general creditor,
look only to the Issuer for payment thereof (but only to the extent of the
amounts so paid to the Issuer), and all liability of the Indenture Trustee or
such Paying Agent with respect to such trust money shall thereupon cease;
provided, however, that the Indenture Trustee or such Paying Agent, before being
required to make any such repayment, shall at the expense and direction of the
Issuer cause to be published once, in a newspaper published in the English
language, customarily published on each Business Day and of general circulation
in The City of New York, notice that such money remains unclaimed and that,
after a date specified therein, which shall not be less than 30 days from the
date of such publication, any unclaimed balance of such money then remaining
will be repaid to the Issuer. The Indenture Trustee shall also adopt and employ,
at the expense and direction of the Issuer, any other reasonable means of
notification of such repayment (including, but not limited to, mailing notice of
such repayment to Holders whose right to or interest in moneys due and payable
but not claimed is determinable from the records of the Indenture Trustee or of
any Paying Agent, at the last address of record for each such Holder).

         Section 3.04. Existence.

         (a) The Issuer will keep in full effect its existence, rights and
franchises as a statutory trust under the laws of the State of Delaware (unless
it becomes, or any successor Issuer hereunder is or becomes, organized under the
laws of any other State or of the United States of America, in which case the
Issuer will keep in full effect its existence, rights and franchises under the
laws of such other jurisdiction) and will obtain and preserve its qualification
to do business in each jurisdiction in which such qualification is or shall be
necessary to protect the validity and enforceability of this Indenture, the
Notes and the Collateral.

         (b) Any successor to the Owner Trustee appointed pursuant to Section
9.02 of the Trust Agreement shall be the successor Owner Trustee under this
Indenture without the execution or filing of any paper, instrument or further
act to be done on the part of the parties hereto.

         (c) Upon any consolidation or merger of or other succession to the
Owner Trustee, the Person succeeding to the Owner Trustee under the Trust
Agreement may exercise every right and power of the Owner Trustee under this
Indenture with the same effect as if such Person had been named as the Owner
Trustee herein.

         Section 3.05. Protection of Collateral. The Issuer will from time to
time, and upon direction of the Majority Highest Priority Class Noteholders,
execute and deliver all such

                                       20
<PAGE>

supplements and amendments hereto and all such financing statements,
continuation statements, instruments of further assurance and other instruments,
and will take such other action necessary or advisable to:

                  (i) provide further assurance with respect to the Grant of all
         or any portion of the Collateral;

                  (ii) maintain or preserve the lien and security interest (and
         the priority thereof) of this Indenture or carry out more effectively
         the purposes hereof;

                  (iii) perfect, publish notice of or protect the validity of
         any Grant made or to be made by this Indenture;

                  (iv) enforce any rights with respect to the Collateral; or

                  (v) preserve and defend title to the Collateral and the rights
         of the Indenture Trustee and the Noteholders in such Collateral against
         the claims of all Persons and parties.

         The Issuer hereby designates the Administrator its agent and
attorney-in-fact to execute any financing statement, continuation statement or
other instrument provided to the Administrator by the Depositor and required to
be executed pursuant to this Section 3.05.

         Section 3.06. Performance of Obligations.

         (a) The Issuer will not take any action and will use its best efforts
not to permit any action to be taken by others that would release any Person
from any of such Person's material covenants or obligations under any instrument
or agreement included in the Collateral or that would result in the amendment,
hypothecation, subordination, termination or discharge of, or impair the
validity or effectiveness of, any such instrument or agreement, except as
expressly provided in this Indenture, the Sale and Servicing Agreement or such
other instrument or agreement.

         (b) The Issuer may contract with or otherwise obtain the assistance of
other Persons (including, without limitation, the Administrator or the Depositor
under the Administration Agreement) to assist it in performing its duties under
this Indenture, and any performance of such duties by a Person identified to the
Indenture Trustee in an Officer's Certificate of the Issuer shall be deemed to
be action taken by the Issuer. Initially, the Issuer has contracted with the
Depositor and the Administrator to assist the Issuer in performing its duties
under the Indenture. The Administrator must at all times be the same Person as
the Indenture Trustee.

         (c) The Issuer will punctually perform and observe all of its
obligations and agreements contained in this Indenture, any other Operative
Agreements to which it is a party and in the instruments and agreements included
in the Collateral, including but not limited to (i) filing or causing to be
filed all UCC financing statements and continuation statements required to be
filed by the terms of this Indenture and the Sale and Servicing Agreement and
(ii) recording or causing to be recorded all Mortgages, Assignments of Mortgage,
all intervening Assignments of Mortgage and all assumption and modification
agreements required to be recorded by the terms

                                       21
<PAGE>

of the Sale and Servicing Agreement, in accordance with and within the time
periods provided for in this Indenture and/or the Sale and Servicing Agreement,
as applicable. Except as otherwise expressly provided therein, the Issuer shall
not waive, amend, modify, supplement or terminate any Operative Agreement or any
provision thereof without the consent of the Indenture Trustee and the Holders
of a majority of the Outstanding Amount of the Notes.

         (d) If the Issuer shall have knowledge of the occurrence of an Event of
Default under the Sale and Servicing Agreement, the Issuer shall promptly notify
the Indenture Trustee and the Rating Agencies thereof, and shall specify in such
notice the action, if any, the Issuer is taking with respect to such default.

         (e) As promptly as possible after the giving of notice to the Master
Servicer of the termination of the Master Servicer's rights and powers pursuant
to Section 6.01 of the Sale and Servicing Agreement, the Indenture Trustee shall
proceed in accordance with Section 6.01 of the Sale and Servicing Agreement.

         (f) Without derogating from the absolute nature of the assignment
granted to the Indenture Trustee under this Indenture or the rights of the
Indenture Trustee hereunder, the Issuer agrees that it will not, without the
prior written consent of the Majority Highest Priority Class Noteholders (i)
amend, modify, waive, supplement, terminate or surrender, or agree to any
amendment, modification, supplement, termination, waiver or surrender of, the
terms of any Collateral (except to the extent otherwise provided in the Sale and
Servicing Agreement) or (ii) waive timely performance or observance by the
Seller under the Sale and Servicing Agreement. If any such amendment,
modification, supplement or waiver shall be so consented to by such Holders, the
Issuer agrees, promptly following a request by the Indenture Trustee, to execute
and deliver, in its own name and at its own expense, such agreements,
instruments, consents and other documents as the Indenture Trustee may deem
necessary or appropriate in the circumstances.

         Section 3.08. Negative Covenants. So long as any Notes are Outstanding,
the Issuer shall not:

         (a) except as expressly permitted by this Indenture, the Mortgage Loan
Purchase Agreement, the Trust Agreement or the Sale and Servicing Agreement,
sell, transfer, exchange or otherwise dispose of any of the properties or assets
of the Issuer, including those included in the Collateral, unless directed to do
so by the Indenture Trustee;

         (b) claim any credit on, or make any deduction from the principal or
interest payable in respect of, the Notes (other than amounts properly withheld
from such payments under the Code) or assert any claim against any present or
former Noteholder by reason of the payment of the taxes levied or assessed upon
any part of the Collateral;

         (c) engage in any business or activity other than as permitted by the
Trust Agreement or the Sale and Servicing Agreement or other than in connection
with, or relating to, the issuance of Notes pursuant to this Indenture, or take
any action under Section 5.06 of the Trust Agreement that requires prior written
consent of the Noteholders without such consent;

         (d) issue debt obligations under any other indenture;

                                       22
<PAGE>

         (e) incur or assume any indebtedness or guarantee any indebtedness of
any Person, except for such indebtedness as may be incurred by the Issuer in
connection with the issuance of the Notes pursuant to this Indenture;

         (f) dissolve or liquidate in whole or in part or merge or consolidate
with any other Person;

         (g) (A) permit the validity or effectiveness of this Indenture to be
impaired, or permit the lien of this Indenture to be amended, hypothecated,
subordinated, terminated or discharged, or permit any Person to be released from
any covenants or obligations with respect to the Notes under this Indenture
except as may be expressly permitted hereby, (B) permit any lien, charge,
excise, claim, security interest, mortgage or other encumbrance (other than the
lien of this Indenture) to be created on or extend to or otherwise arise upon or
burden the Collateral or any part thereof or any interest therein or the
proceeds thereof (other than any junior liens or tax liens, mechanics' liens and
other liens that arise by operation of law, in each case on any of the Mortgaged
Properties and arising solely as a result of an action or omission of the
related Mortgagors), or (C) permit the lien of this Indenture not to constitute
a valid first priority (other than with respect to any such tax, mechanic's or
other lien) security interest in the Collateral; or

         (h) remove the Administrator without cause unless the Rating Agency
Condition shall have been satisfied in connection with such removal.

         Section 3.09. Covenants of the Issuer. All covenants of the Issuer in
this Indenture are covenants of the Issuer and are not covenants of the Owner
Trustee. The Owner Trustee is, and any successor Owner Trustee under the Trust
Agreement will be, entering into this Indenture solely as Owner Trustee under
the Trust Agreement and not in its respective individual capacity, and in no
case whatsoever shall the Owner Trustee or any such successor Owner Trustee be
personally liable on, or for any loss in respect of, any of the statements,
representations, warranties or obligations of the Issuer hereunder, as to all of
which the parties hereto agree to look solely to the property of the Issuer.

         Section 3.10. Restricted Payments. The Issuer shall not, directly or
indirectly, (i) pay any dividend or make any distribution (by reduction of
capital or otherwise), whether in cash, property, securities or a combination
thereof, to the Owner Trustee or any owner of a beneficial interest in the
Issuer or otherwise with respect to any ownership or equity interest or security
in or of the Issuer, (ii) redeem, purchase, retire or otherwise acquire for
value any such ownership or equity interest or security or (iii) set aside or
otherwise segregate any amounts for any such purpose; provided, however, that
the Issuer may make, or cause to be made, (x) distributions to the Indenture
Trustee, the Owner Trustee, the Master Servicer, any Servicer and the
Securityholders as contemplated by, and to the extent funds are available for
such purpose under the Indenture, the Sale and Servicing Agreement or the Trust
Agreement and (y) payments to the Indenture Trustee or the Administrator
pursuant to the Administration Agreement. The Issuer will not, directly or
indirectly, make or cause to be made payments to or distributions from the Trust
Accounts except in accordance with this Indenture and the other Operative
Agreements.

         Section 3.11. Treatment of Notes as Debt for Tax Purposes. The Issuer
shall, and shall cause the Administrator and the Master Servicer to, treat the
Notes as indebtedness for all

                                       23
<PAGE>

federal, state and local tax purposes (except that any Note held by a person
that, for federal income tax purposes, owns or is treated as owning a 100%
Percentage Interest of the Trust Certificate shall not be treated as outstanding
indebtedness for such purposes).

         Section 3.12. Notice of Events of Default. The Issuer shall give the
Indenture Trustee and the Rating Agencies prompt written notice of each Event of
Default hereunder and each default on the part of the Master Servicer under the
Sale and Servicing Agreement.

         Section 3.13. Further Instruments and Acts. Upon request of the
Indenture Trustee, the Issuer will execute and deliver such further instruments
and do such further acts as may be reasonably necessary or proper to carry out
more effectively the purpose of this Indenture.

         Section 3.14. Annual Statement as to Compliance. So long as the Notes
are outstanding, the Issuer will deliver to the Indenture Trustee, within 120
days after the end of each fiscal year of the Issuer (commencing with the fiscal
year 2003), an Officer's Certificate stating, as to the Authorized Officer
signing such Officer's Certificate, that:

                  (i) a review of the activities of the Issuer during such year
         and of its performance under this Indenture has been made under such
         Authorized Officer's supervision; and

                  (ii) to the best of such Authorized Officer's knowledge, based
         on such review, the Issuer has complied with all conditions and
         covenants under this Indenture throughout such year, or, if there has
         been a default in its compliance with any such condition or covenant,
         specifying each such default known to such Authorized Officer and the
         nature and status thereof.

         Section 3.15. Representations and Warranties of the Issuer. The Issuer
hereby represents and warrants that:

         (a) this Agreement creates a valid and continuing security interest (as
defined in the UCC) in the Collateral in favor of the Indenture Trustee, which
security interest is prior to all other liens, and is enforceable as such as
against creditors of and purchasers from the Issuer;

         (b) the Collateral constitutes "instruments" within the meaning of the
UCC; (c) the Issuer owns and has good and marketable title to the Collateral
free and clear of any lien, claim or encumbrance of any Person;

         (d) the Issuer has received all consents and approvals required by the
terms of the Collateral to pledge the Collateral hereunder to the Indenture
Trustee;

         (e) the Issuer has caused or will have caused, within ten days from the
Closing Date, the filing of all appropriate financing statements in the proper
filing office in the appropriate jurisdictions under applicable law in order to
perfect the security interest in the Collateral granted to the Indenture Trustee
hereunder;

                                       24
<PAGE>

         (f) all original executed copies of each Mortgage Note included in the
Collateral have been delivered to the Indenture Trustee (or its custodian on
behalf of the Indenture Trustee);

         (g) the Issuer has received a written acknowledgment from the Indenture
Trustee that the Indenture Trustee is holding the Mortgage Notes included in the
Collateral solely on behalf and for the benefit of the Securityholders;

         (h) other than the security interest granted to the Indenture Trustee
pursuant to this Agreement, the Issuer has not pledged, assigned, sold, granted
a security interest in, or otherwise conveyed any of the Collateral. The Issuer
has not authorized the filing of and is not aware of any financing statements
against the Issuer that include a description of collateral covering the
Collateral other than any financing statement relating to the security interest
granted to the Indenture Trustee hereunder or that has been terminated. The
Issuer is not aware of any judgment or tax lien filings against the Issuer; and

         (i) none of the Mortgage Notes included in the Collateral has any marks
or notations indicating that they have been pledged, assigned or otherwise
conveyed to any Person other than the Indenture Trustee.

         The representations and warranties set forth in this Section 3.14 shall
survive the Closing Date and shall not be waived.

         Section 3.16. Annual Opinions as to Collateral. On or before March 15th
in each calendar year, beginning in 2004, the Issuer shall furnish to the
Administrator and the Indenture Trustee an Opinion of Counsel either stating
that, in the opinion of such counsel, such action has been taken with respect to
the recording, filing, re-recording and refiling of this Indenture, any
indentures supplemental hereto and any other requisite documents and with
respect to the execution and filing of any financing statements and continuation
statements as is necessary to maintain the lien and security interest created by
this Indenture and reciting the details of such action or stating that in the
opinion of such counsel no such action is necessary to maintain such lien and
security interest. Such Opinion of Counsel shall also describe the recording,
filing, rerecording and refiling of this Indenture, any indentures supplemental
hereto and any other requisite documents and the execution and filing of any
financing statements and continuation statements that will, in the opinion of
such counsel, be required to maintain the lien and security interest of this
Indenture until March 15th of the following calendar year.

         Section 3.17. Master Servicer's Obligations. The Issuer shall cause the
Master Servicer to comply with the Sale and Servicing Agreement.

                                   ARTICLE IV
                           SATISFACTION AND DISCHARGE

         Section 4.01. Satisfaction and Discharge of Indenture. This Indenture
shall be discharged and cease to be of further effect with respect to the Notes
and Collateral securing the Notes when either (i) the Sale and Servicing
Agreement has been terminated pursuant to Article VII thereof or (ii) all of the
following have occurred:

         (a) either

                                       25
<PAGE>

                  (1) all Notes theretofore authenticated and delivered (other
         than (A) Notes that have been mutilated, destroyed, lost or stolen and
         that have been replaced or paid as provided in Section 2.04 and (B)
         Notes for whose payment money has theretofore been deposited in trust
         or segregated and held in trust by the Issuer and thereafter repaid to
         the Issuer or discharged from such trust, as provided in Section 3.03)
         have been delivered to the Indenture Trustee for cancellation; or

                  (2) all Notes not theretofore delivered to the Indenture
         Trustee for cancellation (A) have become due and payable, (B) will
         become due and payable within one year of the Maturity Date (or, if one
         or more Classes of Notes have different Maturity Dates, the latest
         Maturity Date), or (C) are to be called for redemption within one year
         under arrangements satisfactory to the Indenture Trustee for the giving
         of notice of redemption by the Indenture Trustee in the name, and at
         the expense, of the Issuer, and the Issuer has irrevocably deposited or
         caused to be irrevocably deposited with the Indenture Trustee cash or
         direct obligations of or obligations guaranteed by the United States of
         America (which will mature prior to the date such amounts are payable),
         in trust for such purpose, in an amount sufficient to pay and discharge
         the entire indebtedness on such Notes to the applicable Maturity Date
         of such Class of Notes or the Redemption Date (if Notes are called for
         redemption pursuant to Section 10.01(b) hereof), as the case may be;

         (b) the date on which the Issuer has paid or caused to be paid all
other sums payable hereunder and no other amounts will become due and payable by
the Issuer; and

         (c) the Issuer has delivered to the Indenture Trustee an Officer's
Certificate and an Opinion of Counsel (at the Issuer's expense) and (if required
by Section 3.14(c) or any other Section of the TIA or the Indenture Trustee) an
Independent Certificate from a firm of certified public accountants, each
meeting the applicable requirements of Section 11.01(a) hereof and, subject to
Section 11.02 hereof (and with respect to any Independent Certificate, subject
to Section 11.01(f) hereof), each stating that all conditions precedent herein
provided for relating to the satisfaction and discharge of this Indenture with
respect to the Notes have been complied with, then, upon Issuer Request, this
Indenture and the lien, rights, and interests created hereby shall cease to be
of further effect with respect to the Notes (except as to (i) rights of
registration of transfer and exchange, (ii) substitution of mutilated,
destroyed, lost or stolen Notes, (iii) rights of Noteholders to receive payments
of principal thereof and interest thereon, (iv) Sections 3.03, 3.05, 3.07 and
3.08 hereof, (v) the rights, obligations and immunities of the Indenture Trustee
hereunder (including the rights of the Indenture Trustee under Section 6.07 and
the obligations of the Indenture Trustee under Section 4.02) and (vi) the rights
of Noteholders as beneficiaries hereof with respect to the property so deposited
with the Indenture Trustee payable to all or any of them). For purposes of
providing any tax information to Noteholders pursuant to Section 6.06 hereof,
the Indenture Trustee shall not treat a deposit made by the Issuer (or that the
Issuer has caused to be made), pursuant to Section 4.01(a)(2) hereof, prior to
the time at which the Notes become due and payable, or prior to the date on
which such Notes are called for redemption, as a payment by the Issuer on, or in
retirement of, the Notes.

         The Indenture Trustee, on demand of and at the expense of the Issuer,
shall execute and deliver proper instruments acknowledging satisfaction and
discharge of this Indenture with

                                       26
<PAGE>

respect to the Notes, and shall pay, or assign or transfer and deliver, to or at
the direction of the Issuer, all Collateral held by it after satisfaction of the
conditions specified in clauses (b) and (c) above.

         Section 4.02. Application of Trust Money. All moneys deposited with the
Indenture Trustee pursuant to Sections 3.03 and 4.01 hereof shall be held in
trust and applied by it, in accordance with the provisions of the Notes and this
Indenture, to the payment, either directly or through any Paying Agent, as the
Indenture Trustee may determine, to the Holders of the Notes for the payment of
all sums due and to become due thereon for principal and interest; but such
moneys need not be segregated from other funds except to the extent required
herein or in the Sale and Servicing Agreement or otherwise required by law.

         Section 4.03. Repayment of Moneys Held by Paying Agent. In connection
with the satisfaction and discharge of this Indenture with respect to the Notes,
all moneys then held by any Paying Agent other than the Indenture Trustee under
the provisions of this Indenture with respect to such Notes shall, upon demand
of the Issuer, be paid to the Indenture Trustee to be held and applied according
to Section 3.03 and thereupon such Paying Agent shall be released from all
further liability with respect to such monies.

                                   ARTICLE V
                           EVENTS OF DEFAULT; REMEDIES

         Section 5.01. Events of Default.

         (a) "Event of Default," wherever used herein, means any one of the
following events (whatever the reason for such Event of Default and whether it
shall be voluntary or involuntary or be effected by operation of law or pursuant
to any judgment, decree or order of any court or any order, rule or regulation
of any administrative or governmental body):

                  (i) Subject to Section 5.01(c), a default in the payment of
         Current Interest in respect of the Highest Priority Class Notes when
         the same becomes due and payable, and the continuance of such default
         for a period of five (5) days; or

                  (ii) a default in the payment of the entire Class Principal
         Amount of any Note on the applicable Maturity Date; or

                  (iii) either the Issuer or the pool of Collateral becomes an
         "investment company" required to be registered under the Investment
         Company Act of 1940, as amended; or

                  (iv) default in the observance or performance of any covenant
         or agreement of the Issuer made in this Indenture (other than a
         covenant or agreement, a default in the observance or performance
         of which is elsewhere in this Section specifically dealt with), or
         any representation or warranty of the Issuer made in this Indenture,
         the Sale and Servicing Agreement or in any certificate or other
         writing delivered pursuant hereto or in connection herewith proving
         to have been incorrect in any material respect as of the time when the
         same shall have been made, and such default shall continue or not be
         cured, or the circumstance or condition in respect of which such
         representation or warranty was

                                       27
<PAGE>

         incorrect shall not have been eliminated or otherwise cured, for a
         period of 60 days after there shall have been given, by registered or
         certified mail, to the Issuer by the Indenture Trustee or to the Issuer
         and the Indenture Trustee by the Holders of at least 25% of the
         Outstanding Amount of the Notes, a written notice specifying such
         default or incorrect representation or warranty and requiring it to be
         remedied and stating that such notice is a notice of Default hereunder;
         or

                  (v) the filing of a decree or order for relief by a court
         having jurisdiction in the premises in respect of the Issuer or any
         substantial part of the Collateral in an involuntary case under any
         applicable federal or state bankruptcy, insolvency or other similar law
         now or hereafter in effect, or appointing a receiver, liquidator,
         assignee, custodian, trustee, sequestrator or similar official of the
         Issuer or for any substantial part of the Collateral, or ordering the
         winding-up or liquidation of the Issuer's affairs, and such decree or
         order shall remain unstayed and in effect for a period of 60
         consecutive days; or

                  (vi) the commencement by the Issuer of a voluntary case under
         any applicable federal or state bankruptcy, insolvency or other similar
         law now or hereafter in effect, or the consent by the Issuer to the
         entry of an order for relief in an involuntary case under any such law,
         or the consent by the Issuer to the appointment or taking possession by
         a receiver, liquidator, assignee, custodian, trustee, sequestrator or
         similar official of the Issuer or for any substantial part of the
         Collateral, or the making by the Issuer of any general assignment for
         the benefit of creditors, or the failure by the Issuer generally to pay
         its debts as such debts become due, or the taking of any action by the
         Issuer in furtherance of any of the foregoing.

         (b) The Issuer shall deliver to a Responsible Officer of the Indenture
Trustee, within five days after the occurrence thereof, written notice in the
form of an Officer's Certificate of any event which with the giving of notice
and the lapse of time would become an Event of Default, its status and what
action the Issuer is taking or proposes to take with respect thereto.

         (c) Neither (i) the failure to pay the full amount of Current Interest
payable pursuant to Section 8.02 to the Holders of any Non-Priority Class nor
(ii) an application of Applied Loss Amounts pursuant to Section 5.07 of the Sale
and Servicing Agreement to a Non-Priority Class shall constitute an Event of
Default under Section 5.01(a).

         Section 5.02. Acceleration of Maturity; Rescission and Annulment.

         (a) If an Event of Default should occur and be continuing of which a
Responsible Officer of the Indenture Trustee has actual knowledge, then and in
every such case the Indenture Trustee may, and shall at the direction of the
Majority Highest Priority Class Noteholders, declare all the Notes to be
immediately due and payable, by a notice in writing to the Issuer, and upon any
such declaration the unpaid principal amount of such Notes, together with
accrued and unpaid interest thereon through the date of acceleration, shall
become immediately due and payable.

         (b) At any time after such declaration of acceleration of maturity has
been made and before a judgment or decree for payment of the money due has been
obtained by the Indenture

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<PAGE>

Trustee as hereinafter in this Article V provided, the Majority Highest Priority
Class Noteholders, by written notice to the Issuer and the Indenture Trustee,
may rescind and annul such declaration and its consequences if the Issuer has
paid or deposited with the Indenture Trustee a sum sufficient to pay:

                  (i) all payments of principal of and interest on all Highest
         Priority Class Notes and all other amounts that would then be due
         hereunder or upon such Highest Priority Class Notes if the Event of
         Default giving rise to such acceleration had not occurred; and

                  (ii) all sums paid or advanced by the Indenture Trustee
         hereunder and the reasonable compensation, expenses, disbursements and
         advances of the Indenture Trustee and its agents and counsel; and

                  (iii) all Events of Default, other than the nonpayment of the
         principal of the Notes that has become due solely by such acceleration,
         have been cured or waived as provided in Section 5.11.

         No such rescission shall affect any subsequent default or impair any
right consequent thereto.

         The Holders of Notes of a Non-Priority Class shall have no right to
exercise any remedies of Noteholders under this Article V, except to the extent
otherwise expressly provided herein.

         Section 5.03. Collection of Indebtedness and Suits for Enforcement by
Indenture Trustee.

         (a) The Issuer covenants that if default is made in the payment of any
interest on any Highest Priority Class Note when the same becomes due and
payable, and such default continues for a period of five days, the Issuer will,
upon demand of the Indenture Trustee or at the direction of the Majority Highest
Priority Class Noteholders, pay to the Indenture Trustee, for the benefit of the
Holders of the Notes, the whole amount then due and payable on such Notes for
interest and in addition thereto such further amount as shall be sufficient to
cover the costs and expenses of collection, including the reasonable
compensation, expenses, disbursements and advances of the Indenture Trustee and
its agents and counsel and such amounts as may be due to the Yield Maintenance
Counterparty.

         (b) In case the Issuer shall fail forthwith to pay such amounts upon
such demand, the Indenture Trustee, in its own name and as trustee of an express
trust may, and shall, at the direction of the Majority Highest Priority Class
Noteholders, institute a Proceeding for the collection of the sums so due and
unpaid, and may prosecute such Proceeding to judgment or final decree, and may
enforce the same against the Issuer or other obligor upon such Notes and collect
in the manner provided by law out of the property of the Issuer or other obligor
upon such Notes, wherever situated, the monies adjudged or decreed to be
payable.

         (c) If an Event of Default occurs and is continuing, the Indenture
Trustee may, in its discretion, and shall, at the direction of the Majority
Highest Priority Class Noteholders, as more particularly provided in Section
5.04, proceed to protect and enforce its rights and the rights of

                                       29
<PAGE>

the Noteholders, by such appropriate Proceedings as the Indenture Trustee shall
deem most effective to protect and enforce any such rights, whether for the
specific enforcement of any covenant or agreement in this Indenture or in aid of
the exercise of any power granted herein, or to enforce any other proper remedy
or legal or equitable right vested in the Indenture Trustee by this Indenture or
by law.

         (d) In case there shall be pending, relative to the Issuer or any other
obligor upon the Notes or any Person having or claiming an ownership interest in
the Collateral, Proceedings under Title 11 of the United States Code or any
other applicable federal or state bankruptcy, insolvency or other similar law,
or in case a receiver, assignee or trustee in bankruptcy or reorganization,
liquidator, sequestrator or similar official shall have been appointed for or
taken possession of the Issuer or its property or such other obligor or Person,
or in case of any other comparable judicial Proceedings relative to the Issuer
or other obligor upon the Notes, or to the creditors or property of the Issuer
or such other obligor, the Indenture Trustee, irrespective of whether the
principal of any Notes shall then be due and payable as therein expressed or by
declaration or otherwise and irrespective of whether the Indenture Trustee shall
have made any demand pursuant to the provisions of this Section, shall be
entitled and empowered, upon the direction of the Majority Highest Priority
Class Noteholders, by intervention in such Proceedings or otherwise:

                  (i) to file and prove a claim or claims for the whole amount
         of principal and interest owing and unpaid in respect of the Notes and
         to file such other papers or documents as may be necessary or advisable
         in order to have the claims of the Indenture Trustee (including any
         claim for reasonable compensation to the Indenture Trustee, each
         predecessor Indenture Trustee, and their respective agents, attorneys
         and counsel, and for reimbursement of all expenses and liabilities
         incurred, and all advances made, by the Indenture Trustee and each
         predecessor Indenture Trustee (except as a result of negligence or bad
         faith)), and of the Noteholders allowed in such Proceedings;

                  (ii) unless prohibited by applicable law and regulations, to
         vote on behalf of the Holders of Notes in any election of a trustee, a
         standby trustee or Person performing similar functions in any such
         Proceedings;

                  (iii) to collect and receive any moneys or other property
         payable or deliverable on any such claims and to distribute all amounts
         received with respect to the claims of the Noteholders and the
         Indenture Trustee on their behalf;

                  (iv) to file such proofs of claim and other papers or
         documents as may be necessary or advisable in order to have the claims
         of the Indenture Trustee or the Holders of Notes allowed in any
         judicial proceedings relative to the Issuer, its creditors and its
         property; and any trustee, receiver, liquidator, custodian or other
         similar official in any such Proceeding is hereby authorized by each of
         such Noteholders to make payments to the Indenture Trustee and, in the
         event that the Indenture Trustee shall consent to the making of
         payments directly to such Noteholders, to pay to the Indenture Trustee
         such amounts as shall be sufficient to cover reasonable compensation to
         the Indenture Trustee, each predecessor Indenture Trustee and their
         respective agents, attorneys and counsel, and all other expenses and
         liabilities incurred, and all advances made, by the Indenture

                                       30
<PAGE>

         Trustee and each predecessor Indenture Trustee except as a result of
         negligence or bad faith;

                  (v) nothing herein contained shall be deemed to authorize the
         Indenture Trustee to authorize or consent to or vote for or accept or
         adopt on behalf of any Noteholder any plan of reorganization,
         arrangement, adjustment or composition affecting the Notes or the
         rights of any Holder thereof or to authorize the Indenture Trustee to
         vote in respect of the claim of any Noteholder in any such proceeding
         except, as aforesaid, to vote for the election of a trustee in
         bankruptcy or similar Person;

                  (vi) all rights of action and of asserting claims under this
         Indenture, or under any of the Notes, may be enforced by the Indenture
         Trustee without the possession of any of the Notes or the production
         thereof in any trial or other Proceedings relative thereto, and any
         such action or Proceedings instituted by the Indenture Trustee shall be
         brought in its own name as trustee of an express trust, and any
         recovery of judgment, subject to the payment of the expenses,
         disbursements and compensation of the Indenture Trustee, each
         predecessor Indenture Trustee and their respective agents and
         attorneys, shall be for the benefit of the Holders of the Notes and the
         Yield Maintenance Counterparty; and

                  (vii) in any Proceedings brought by the Indenture Trustee (and
         also any Proceedings involving the interpretation of any provision of
         this Indenture to which the Indenture Trustee shall be a party), the
         Indenture Trustee shall be held to represent all the Noteholders, and
         it shall not be necessary to make any Noteholder a party to any such
         Proceedings.

         Section 5.05. Remedies; Priorities.

         (a) If an Event of Default shall have occurred and be continuing, of
which a Responsible Officer of the Indenture Trustee has actual knowledge, the
Indenture Trustee may, and at the direction of the Majority Highest Priority
Class Noteholders shall, do one or more of the following (subject to Section
5.05 and Section 5.15):

                  (i) institute Proceedings in its own name (as Indenture
         Trustee) and as trustee of an express trust for the collection of all
         amounts then payable on the Notes or under this Indenture with respect
         thereto, whether by declaration or otherwise, enforce any judgment
         obtained, and collect from the Issuer and any other obligor upon such
         Notes monies adjudged due;

                  (ii) institute Proceedings from time to time for the complete
         or partial foreclosure of this Indenture with respect to the
         Collateral;

                  (iii) exercise any remedies of a secured party under the UCC
         and take any other appropriate action to protect and enforce the rights
         and remedies of the Indenture Trustee or the Noteholders; and

                  (iv) sell the Collateral or any portion thereof or rights or
         interest therein in a commercially reasonable manner, at one or more
         public or private sales called and conducted in any manner permitted by
         law;

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<PAGE>

         provided, however, that the Indenture Trustee may not sell or otherwise
         liquidate the Collateral following an Event of Default, unless (A) the
         Holders of 100% of the Outstanding Amount of the Notes consent thereto,
         (B) the proceeds of such sale or liquidation distributable to the
         Noteholders are sufficient to discharge in full all amounts then due
         and unpaid upon the Notes for principal and interest or (C) the
         Indenture Trustee determines that the Collateral will not continue to
         provide sufficient funds for the payment of principal of and interest
         on the Notes as they would have become due if the Notes had not been
         declared due and payable, and the Indenture Trustee obtains the consent
         of Holders of 66-2/3% of the Outstanding Amount of the Highest Priority
         Class Notes. In determining such sufficiency or insufficiency with
         respect to clauses (B) and (C), the Indenture Trustee shall obtain at
         the cost of the Issuer and rely upon an opinion of an Independent
         investment banking or accounting firm of national reputation as to the
         feasibility of such proposed action and as to the sufficiency of the
         Collateral for such purpose.

         (b) If the Indenture Trustee collects any money or property pursuant to
this Article V, it shall pay out the money or property in the following order:

                  first: to the Indenture Trustee, for any costs or expenses
                  incurred by it in connection with the enforcement of the
                  remedies provided for in this Article V and for any other
                  unpaid amounts due to the Indenture Trustee hereunder, to the
                  Administrator for any amounts due and owing to it under the
                  Administration Agreement, and to the Owner Trustee, to the
                  extent of any amounts due and owing to it under the Operative
                  Agreements (including pursuant to Section 7.02 of the Trust
                  Agreement) and for any other unpaid amounts due to the Owner
                  Trustee hereunder;

                  second: to the Master Servicer and Servicers for any Master
                  Servicing Fees or Servicing Fees then due and unpaid and any
                  unreimbursed Advances and other servicing advances;

                  third: to the Yield Maintenance Counterparty, any Net Yield
                  Maintenance Payments, if any, owed under the Yield Maintenance
                  Agreement;

                  fourth: to the Notes, all accrued and unpaid interest thereon
                  and amounts in respect of principal according to the
                  priorities set forth in Section 5.06 of the Sale and Servicing
                  Agreement; provided, however, that accrued and unpaid interest
                  shall be paid to Noteholders of each Class before any payments
                  in respect of principal;

                  fifth, to the Yield Maintenance Counterparty, any Additional
                  Yield Maintenance Payments owed under the Yield Maintenance
                  Agreements; and

                  sixth, to the Certificate Account, for distribution to the
                  holder of the Trust Certificate.

         The Indenture Trustee may fix a record date and payment date for any
payment to be made to the Noteholders pursuant to this Section. At least 15 days
before such record date, the Indenture Trustee shall mail to each Noteholder and
the Issuer a notice that states the record date, the payment date and the amount
to be paid.

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<PAGE>

         Section 5.07. Limitation of Suits. No Holder of any Note shall have any
right to institute any Proceeding, judicial or otherwise, with respect to this
Indenture or for the appointment of a receiver or trustee, or for any other
remedy hereunder, unless:

         (a) such Holder has previously given written notice to the Indenture
Trustee of a continuing Event of Default;

         (b) Majority Highest Priority Class Noteholders have made written
request to the Indenture Trustee to institute such Proceeding in respect of such
Event of Default in its own name as Indenture Trustee hereunder;

         (c) such Holder or Holders have offered to the Indenture Trustee
reasonable indemnity against the costs, expenses and liabilities to be incurred
in complying with such request;

         (d) the Indenture Trustee for 60 days after its receipt of such notice,
request and offer of indemnity has failed to institute such Proceedings; and

         (e) no direction inconsistent with such written request has been given
to the Indenture Trustee during such 60-day period by the Majority Highest
Priority Class Noteholders.

         It is understood and intended that no one or more Holders of Notes
shall have any right in any manner whatever by virtue of, or by availing of, any
provision of this Indenture to affect, disturb or prejudice the rights of any
other Holders of Notes or to obtain or to seek to obtain priority or preference
over any other Holders or to enforce any right under this Indenture, except in
the manner herein provided.

         Section 5.08. Unconditional Rights of Noteholders To Receive Principal
and Interest. Notwithstanding any other provisions in this Indenture, the Holder
of any Note shall have the right, which is absolute and unconditional, to
receive payment of the principal of, interest, if any, and Deferred Amounts, if
any, on such Note on or after the Maturity Date (or, in the case of redemption,
on or after the Redemption Date) and to institute suit for the enforcement of
any such payment, and such right shall not be impaired without the consent of
such Holder.

         Section 5.09. Restoration of Rights and Remedies. If the Indenture
Trustee or any Noteholder has instituted any Proceeding to enforce any right or
remedy under this Indenture and such Proceeding has been discontinued or
abandoned for any reason or has been determined adversely to the Indenture
Trustee or to such Noteholder, then and in every such case the Issuer, the
Indenture Trustee and the Noteholders shall, subject to any determination in
such Proceeding, be restored severally and respectively to their former
positions hereunder, and thereafter all rights and remedies of the Indenture
Trustee and the Noteholders shall continue as though no such Proceeding had been
instituted.

         Section 5.10. Rights and Remedies Cumulative. No right or remedy herein
conferred upon or reserved to the Indenture Trustee or to the Noteholders is
intended to be exclusive of any other right or remedy, and every right and
remedy shall, to the extent permitted by law, be cumulative and in addition to
every other right and remedy given hereunder or now or hereafter existing at law
or in equity or otherwise. The assertion or employment of any right or remedy

                                       33
<PAGE>

hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other appropriate right or remedy.

         Section 5.11. Delay or Omission Not a Waiver. No delay or omission of
the Indenture Trustee or any Holder of any Note to exercise any right or remedy
accruing upon any Default or Event of Default shall impair any such right or
remedy or constitute a waiver of any such Default or Event of Default or an
acquiescence therein. Every right and remedy given by this Article V or by law
to the Indenture Trustee or to the Noteholders may be exercised from time to
time, and as often as may be deemed expedient, by the Indenture Trustee or by
the Noteholders, as the case may be.

         Section 5.12. Control by Noteholders.

         The Majority Highest Priority Class Noteholders shall have the right to
direct the time, method and place of conducting any Proceeding for any remedy
available to the Indenture Trustee with respect to the Notes or exercising any
trust or power conferred on the Indenture Trustee; provided that:

         (a) such direction shall not be in conflict with any rule of law or
with this Indenture;

         (b) subject to the express terms of Section 5.04, any direction to the
Indenture Trustee to sell or liquidate the Collateral shall be by Holders of
Notes representing not less than 100% of the Outstanding Amount of the Highest
Priority Class Notes; and

         (c) the Indenture Trustee may take any other action deemed proper by
the Indenture Trustee that is not inconsistent with such direction.

         Notwithstanding the rights of the Noteholders set forth in this
Section, subject to Section 6.01, the Indenture Trustee need not take any action
that it determines might involve it in liability or might materially adversely
affect the rights of any Noteholders not consenting to such action.

         Section 5.13. Waiver of Past Defaults. Prior to the declaration of the
acceleration of the maturity of the Notes as provided in Section 5.02, the
Majority Highest Priority Class Noteholders may waive any past Default or Event
of Default and its consequences except a Default (a) in the payment of interest
on any of the Notes or (b) in respect of a covenant or provision hereof that
cannot be modified or amended without the consent of the Holder of each Note, as
applicable. In the case of any such waiver, the Issuer, the Indenture Trustee
and the Holders of the Notes shall be restored to their former positions and
rights hereunder, respectively; but no such waiver shall extend to any
subsequent or other Default or impair any right consequent thereto.

         Upon any such waiver, such Default shall cease to exist and be deemed
to have been cured and not to have occurred, and any Event of Default arising
therefrom shall be deemed to have been cured and not to have occurred, for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other Default or Event of Default or impair any right consequent thereto.

                                       34
<PAGE>

         Section 5.14. Undertaking for Costs. All parties to this Indenture
agree, and each Holder of any Note by such Holder's acceptance thereof shall be
deemed to have agreed, that any court may in its discretion require, in any suit
for the enforcement of any right or remedy under this Indenture, or in any suit
against the Indenture Trustee for any action taken, suffered or omitted by it as
Indenture Trustee, the filing by any party litigant in such suit of an
undertaking to pay the costs of such suit, and that such court may in its
discretion assess reasonable costs, including reasonable attorneys' fees,
against any party litigant in such suit, having due regard to the merits and
good faith of the claims or defenses made by such party litigant; but the
provisions of this Section shall not apply to (a) any suit instituted by the
Indenture Trustee, (b) any suit instituted by any Noteholder, or group of
Noteholders, in each case holding in the aggregate more than 10% of the
Outstanding Amount of the Notes or (c) any suit instituted by any Noteholder for
the enforcement of the payment of principal of or interest on any Note on or
after the respective due dates expressed in such Note and in this Indenture.

         Section 5.15. Waiver of Stay or Extension Laws. The Issuer covenants
(to the extent that it may lawfully do so) that it will not at any time insist
upon, or plead or in any manner whatsoever, claim or take the benefit or
advantage of, any stay or extension law wherever enacted, now or at any time
hereafter in force, that may affect the covenants or the performance of this
Indenture; and the Issuer (to the extent that it may lawfully do so) hereby
expressly waives all benefit or advantage of any such law, and covenants that it
will not hinder, delay or impede the execution of any power herein granted to
the Indenture Trustee, but will suffer and permit the execution of every such
power as though no such law had been enacted.

         Section 5.16. Action on Notes.

         The Indenture Trustee's right to seek and recover judgment on the Notes
or under this Indenture shall not be affected by the seeking, obtaining or
application of any other relief under or with respect to this Indenture. Neither
the lien of this Indenture nor any rights or remedies of the Indenture Trustee
or the Noteholders shall be impaired by the recovery of any judgment by the
Indenture Trustee against the Issuer or by the levy of any execution under such
judgment upon any portion of the Collateral or upon any of the assets of the
Issuer. Any money or property collected by the Indenture Trustee shall be
applied in accordance with Section 5.04(b).

         Section 5.17. Optional Preservation of the Collateral. If the Notes
have been declared to be due and payable under Section 5.02 following an Event
of Default and such declaration and its consequences have not been rescinded and
annulled, the Indenture Trustee may, but need not, elect to maintain possession
of the Collateral. It is the desire of the parties hereto and the Noteholders
that there be at all times sufficient funds for the payment of principal of and
interest on the Notes, and the Indenture Trustee shall take such desire into
account when determining whether or not to maintain possession of the
Collateral. In determining whether to maintain possession of the Collateral, the
Indenture Trustee may, but need not, obtain and rely upon an opinion (at the
expense of the Issuer) of an Independent investment banking or accounting firm
of national reputation as to the feasibility of such proposed action and as to
the sufficiency of the Collateral for such purpose.

                                       35
<PAGE>

         Section 5.18. Performance and Enforcement of Certain Obligations.

         (a) Promptly following a request from the Indenture Trustee to do so
and at the Issuer's expense, the Issuer shall take all such lawful action as the
Indenture Trustee may request to compel or secure the performance and observance
by the Seller and the Master Servicer, as applicable, of each of their
obligations to the Issuer under or in connection with the Mortgage Loan Purchase
Agreement and the Sale and Servicing Agreement, and to exercise any and all
rights, remedies, powers and privileges lawfully available to the Issuer under
or in connection with the Sale and Servicing Agreement to the extent and in the
manner directed by the Indenture Trustee, including the transmission of notices
of default on the part of the Seller thereunder and the institution of legal or
administrative actions or proceedings to compel or secure performance by the
Seller or the Master Servicer of each of their obligations under the Sale and
Servicing Agreement and the Mortgage Loan Purchase Agreement.

         (b) If an Event of Default of which a Responsible Officer of the
Indenture Trustee has actual knowledge has occurred and is continuing, the
Indenture Trustee may, and at the direction (which direction shall be in writing
or by telephone, confirmed in writing promptly thereafter) of the Majority
Highest Priority Class Noteholders shall, exercise all rights, remedies, powers,
privileges and claims of the Issuer against the Master Servicer under or in
connection with the Sale and Servicing Agreement or the Seller under or in
connection with the Mortgage Loan Purchase Agreement, including the right or
power to take any action to compel or secure performance or observance by the
Seller or the Master Servicer of each of their obligations to the Issuer
thereunder and to give any consent, request, notice, direction, approval,
extension, or waiver under the Sale and Servicing Agreement or Mortgage Loan
Purchase Agreement, and any right of the Issuer to take such action shall be
suspended.

                                   ARTICLE VI
                              THE INDENTURE TRUSTEE

         Section 6.01. Duties of Indenture Trustee.

         (a) If an Event of Default has occurred and is continuing, the
Indenture Trustee shall exercise the rights and powers vested in it by this
Indenture and use the same degree of care and skill in their exercise as a
prudent person would exercise or use under the circumstances in the conduct of
such person's own affairs.

         (b) Except during the continuance of an Event of Default:

                  (i) the Indenture Trustee undertakes to perform such duties
         and only such duties as are specifically set forth in this Indenture,
         the Indenture Trustee shall not be liable except for the performance of
         such duties and obligations as are specifically set forth in this
         Indenture and no implied covenants or obligations shall be read into
         this Indenture against the Indenture Trustee; and

                  (ii) in the absence of bad faith on its part, the Indenture
         Trustee may conclusively rely, as to the truth of the statements and
         the correctness of the opinions expressed therein, upon certificates or
         opinions furnished to the Indenture Trustee and conforming to the
         requirements of this Indenture; however, the Indenture Trustee shall

                                       36
<PAGE>

         examine the certificates and opinions to determine whether or not they
         conform on their face to the requirements of this Indenture.

         (c) The Indenture Trustee may not be relieved from liability for its
own negligent action, its own negligent failure to act or its own willful
misconduct, except that:

                  (i) this paragraph does not limit the effect of paragraph (b)
         of this Section;

                  (ii) the Indenture Trustee shall not be liable for any error
         of judgment made in good faith by a Responsible Officer unless it is
         proved that the Indenture Trustee was negligent in ascertaining the
         pertinent facts;

                  (iii) the Indenture Trustee shall not be liable with respect
         to any action it takes or omits to take in good faith in accordance
         with this Agreement or upon a direction received by it pursuant to
         Section 5.10 hereof;

                  (iv) the Indenture Trustee shall not be liable for interest on
         any money received by it except as the Indenture Trustee may agree in
         writing with the Issuer;

                  (v) money held in trust by the Indenture Trustee shall be
         segregated from other funds except to the extent permitted by law or
         the terms of this Indenture or the Sale and Servicing Agreement;

                  (vi) no provision of this Indenture shall require the
         Indenture Trustee to expend or risk its own funds or otherwise incur
         financial liability in the performance of any of its duties hereunder
         or in the exercise of any of its rights or powers, if it shall have
         reasonable grounds to believe that repayment of such funds or adequate
         indemnity against such risk or liability is not reasonably assured to
         it;

                  (vii) every provision of this Indenture relating to the
         conduct or affecting the liability of or affording protection to the
         Indenture Trustee shall be subject to the provisions of this Section
         and to the provisions of the TIA;

                  (viii) the Indenture Trustee shall not be required to take
         notice or be deemed to have notice or knowledge of any default or Event
         of Default (except an Event of Default described in Section 5.01(a)(i))
         unless a Responsible Officer of the Indenture Trustee shall have actual
         knowledge thereof; in the absence of such actual knowledge, the
         Indenture Trustee may conclusively assume that there is no default or
         Event of Default; and

                  (ix) anything in this Agreement to the contrary
         notwithstanding, in no event shall the Indenture Trustee be liable for
         special, indirect or consequential loss or damage of any kind
         whatsoever (including but not limited to lost profits), even if the
         Indenture Trustee has been advised of the likelihood of such loss or
         damage and regardless of the form of action.

         (d) The Indenture Trustee shall not have any duty or obligation to
manage, make any payment with respect to, register, record, sell, dispose of, or
otherwise deal with the Collateral,

                                       37
<PAGE>

or to otherwise take or refrain from taking any action under, or in connection
with, any document contemplated hereby to which the Indenture Trustee is a
party, except as expressly provided (i) in accordance with the powers granted to
and the authority conferred upon the Indenture Trustee pursuant to this
Agreement or any other Operative Agreement, and (ii) in accordance with any
document or instruction delivered to the Indenture Trustee pursuant to the terms
of this Agreement or any other Operative Agreement; and no implied duties or
obligations shall be read into this Agreement or any Operative Agreement against
the Indenture Trustee. The Indenture Trustee shall have no responsibility to
prepare or file any Securities and Exchange Commission filing for the Trust or
to record this Agreement or any Operative Agreement or to prepare or file any
tax return for the Trust. The Indenture Trustee nevertheless agrees that it
will, at its own cost and expense, promptly take all action as may be necessary
to discharge any liens on any part of the Collateral that result from actions
by, or claims against itself that are not related to the administration of the
Collateral.

         (e) Every provision of this Indenture relating to the conduct or
affecting the liability of or affording protection to the Indenture Trustee
shall be subject to the provisions of this Section and to the provisions of the
TIA.

         Section 6.03. Rights of Indenture Trustee.

         (a) The Indenture Trustee may rely on and shall be protected in acting
in good faith upon any document believed by it to be genuine and to have been
signed or presented by the proper person. The Indenture Trustee need not
investigate any fact or matter stated in any such document.

         (b) Before the Indenture Trustee acts or refrains from acting, it may
require an Officer's Certificate or an Opinion of Counsel. The Indenture Trustee
shall not be liable for any action it takes or omits to take in good faith in
reliance on an Officer's Certificate or an Opinion of Counsel.

         (c) The Indenture Trustee may execute any of the trusts or powers
hereunder or perform any duties hereunder either directly or by or through
agents or attorneys or a custodian or nominee and the Indenture Trustee shall
not be responsible for any misconduct or negligence on the part of such agent,
attorney, custodian or nominee appointed by the Indenture Trustee with due care.

         (d) The Indenture Trustee shall not be liable for any action it takes
or omits to take in good faith which it believes to be authorized or within its
rights or powers; provided, however, that such action or omission by the
Indenture Trustee does not constitute willful misconduct, negligence or bad
faith.

         (e) The Indenture Trustee may consult with counsel, and the advice or
opinion of counsel or any Opinion of Counsel with respect to legal matters
relating to the Operative Agreements shall be full and complete authorization
and protection from liability with respect to any action taken, omitted or
suffered by it hereunder in good faith and in accordance with the advice or
opinion of such counsel. The Issuer shall be responsible for the reasonable
costs and expenses of any such counsel.

                                       38
<PAGE>

         (f) The Indenture Trustee shall not be bound to make any investigation
into the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, consent, order, approval, bond or
other paper or document, unless requested in writing to do so by the Majority
Highest Priority Class Noteholders; provided, however, that if the payment
within a reasonable time to the Indenture Trustee of the costs, expenses or
liabilities likely to be incurred by it in the making of such investigation is,
in the opinion of the Indenture Trustee, not reasonably assured to the Indenture
Trustee by the security afforded to it by the terms of this Indenture, the
Indenture Trustee may require indemnity reasonably satisfactory to it against
such cost, expense or liability as a condition to taking any such action. The
reasonable expense of every such investigation shall be paid by the Issuer or,
if paid by the Indenture Trustee, shall be repaid by the Issuer upon demand.

         (g) The right of the Indenture Trustee to perform any discretionary act
enumerated in this Agreement shall not be construed as a duty, and the Indenture
Trustee shall not be answerable for other than its negligence or willful
misconduct in the performance of such act.

         (h) The Indenture Trustee shall not be required to give any bond or
surety in respect of the execution of the powers granted hereunder.

         Section 6.06. Individual Rights of Indenture Trustee.

         The Indenture Trustee in its individual or any other capacity other
than as Indenture Trustee may, and in its capacity as Indenture Trustee may not,
become the owner or pledgee of Notes and may otherwise deal with the Issuer or
its Affiliates with the same rights it would have if it were not Indenture
Trustee. Any Paying Agent, Note Registrar, co-registrar or co-paying agent may
do the same with like rights.

         Section 6.07. Indenture Trustee's Disclaimer. The Indenture Trustee
shall not be responsible for and makes no representation as to the validity or
adequacy of this Indenture, any other Operative Agreement or the Notes or the
Issuer's use of the proceeds from the Notes, or responsible for any statement of
the Issuer in the Indenture or in any document issued in connection with the
sale of the Notes or in the Notes other than the Indenture Trustee's certificate
of authentication.

         Section 6.08. Notice of Default. If a Default occurs and is continuing
and if it is known to a Responsible Officer of the Indenture Trustee, the
Indenture Trustee shall mail to each Noteholder notice of the Default within 30
days after it acquires knowledge of such Default.

         Section 6.09. Reports by Indenture Trustee to Holders. Upon request by
a Noteholder, the Master Servicer shall deliver to each Noteholder such
information as may be required to enable such holder to prepare its federal and
State income tax returns.

         Section 6.10. Compensation and Indemnity. As compensation for its
services hereunder and under the Sale and Servicing Agreement (including in its
capacity as Paying Agent, Certificate Paying Agent, Administrator and
Custodian), the Indenture Trustee shall be entitled to receive on each Payment
Date a fee equal to the Indenture Trustee Fee payable from the Note Account
pursuant to Section 5.04 of the Sale and Servicing Agreement. Reimbursement for
all reasonable out-of-pocket expenses incurred or made by the Indenture Trustee,
including costs of

                                       39
<PAGE>

collection, shall be payable by the Issuer. Such expenses shall include the
reasonable compensation and expenses, disbursements and advances, if any, of the
Indenture Trustee's agents, counsel, accountants and experts.

         The payment obligations of the Issuer to the Indenture Trustee
(including in its capacities as Paying Agent, Certificate Paying Agent,
Administrator, Custodian and Securities Intermediary) pursuant to this Section
and the indemnification obligations of the Master Servicer and the Issuer
pursuant to Sections 4.22 and 4.23 of the Sale and Servicing Agreement shall
survive the resignation or removal of the Indenture Trustee or discharge of this
Indenture. When the Indenture Trustee incurs expenses in connection with the
occurrence of a Default specified in Section 5.01(v) or (vi) with respect to the
Issuer, the expenses are intended to constitute expenses of administration under
Title 11 of the United States Code or any other applicable federal or State
bankruptcy, insolvency or similar law.

         Section 6.11. Replacement of Indenture Trustee. No resignation or
removal of the Indenture Trustee and no appointment of a successor Indenture
Trustee shall become effective until the acceptance of appointment by the
successor Indenture Trustee pursuant to this Section. The Indenture Trustee may
resign at any time by so notifying the Issuer. The Holders of a majority in
Outstanding Amount of the Notes may remove the Indenture Trustee by so notifying
the Indenture Trustee and may appoint a successor Indenture Trustee. The Issuer
shall remove the Indenture Trustee if:

         (a) the Indenture Trustee fails to comply with Section 6.11;

         (b) the Indenture Trustee is adjudged a bankrupt or insolvent;

         (c) a receiver or other public officer takes charge of the Indenture
Trustee or its property; or

         (d) the Indenture Trustee otherwise becomes incapable of acting.

         If the Indenture Trustee resigns or is removed or if a vacancy exists
in the office of Indenture Trustee for any reason (the Indenture Trustee in such
event being referred to herein as the "resigning or removed Indenture Trustee"),
the Issuer shall promptly appoint a successor Indenture Trustee that satisfies
the eligibility requirements of Section 6.11.

         The resigning or removed Indenture Trustee agrees to cooperate with any
successor Indenture Trustee in effecting the termination of the resigning or
removed Indenture Trustee's responsibilities and rights hereunder and shall
promptly provide such successor Indenture Trustee all documents and records
reasonably requested by it to enable it to assume the Indenture Trustee's
functions hereunder. Any successor Indenture Trustee shall have all the rights,
powers and duties of the Indenture Trustee under this Indenture.

         The resigning or removed Indenture Trustee shall Grant to the successor
Indenture Trustee the Collateral, and the Seller, the Issuer and the resigning
or removed Indenture Trustee shall execute and deliver such instruments and do
such other things as may reasonably be required for more fully and certainly
vesting and confirming in the successor Indenture Trustee all rights, powers,
duties and obligations under this Indenture.

                                       40
<PAGE>

         The successor Indenture Trustee shall deliver a written acceptance of
its appointment to the resigning or removed Indenture Trustee and the Issuer.
The successor Indenture Trustee shall mail a notice of its succession to
Noteholders. The resigning Indenture Trustee shall promptly transfer all
property held by it as Indenture Trustee to the successor Indenture Trustee.

         If a successor Indenture Trustee does not take office within 60 days
after the retiring Indenture Trustee resigns or is removed, the resigning or
removed Indenture Trustee, the Issuer or the Holders of a majority of the
Outstanding Amount of the Notes may petition any court of competent jurisdiction
for the appointment of a successor Indenture Trustee. If the Indenture Trustee
fails to comply with Section 6.11, any Noteholder may petition any court of
competent jurisdiction for the removal of the Indenture Trustee and the
appointment of a successor Indenture Trustee.

         Notwithstanding the replacement of the Indenture Trustee pursuant to
this Section, the Issuer's obligations under Section 6.07 shall continue for the
benefit of the retiring Indenture Trustee.

         Section 6.12. Successor Indenture Trustee by Merger. If the Indenture
Trustee consolidates with, merges or converts into, or transfers all or
substantially all its corporate trust business or assets to, another corporation
or banking association, the resulting, surviving or transferee corporation
without any further act shall be the successor Indenture Trustee; provided, that
such corporation or banking association shall be otherwise qualified and
eligible under Section 6.11.

         In case at the time such successor or successors by merger, conversion
or consolidation to the Indenture Trustee shall succeed to the trusts created by
this Indenture any of the Notes shall have been authenticated but not delivered,
any such successor to the Indenture Trustee may adopt the certificate of
authentication of any predecessor trustee, and deliver such Notes so
authenticated; and in case at that time any of the Notes shall not have been
authenticated, any successor to the Indenture Trustee may authenticate such
Notes either in the name of any predecessor hereunder or in the name of the
successor to the Indenture Trustee; and in all such cases such certificates
shall have the full force which it is anywhere in the Notes or in this Indenture
provided that the certificate of the Indenture Trustee shall have.

         Section 6.13. Appointment of Co-Indenture Trustee or Separate Indenture
Trustee.

         (a) Notwithstanding any other provisions of this Indenture, at any
time, for the purpose of meeting any legal requirement of any jurisdiction in
which any part of the Collateral may at the time be located, the Indenture
Trustee shall have the power and may execute and deliver all instruments to
appoint one or more Persons to act as a co-trustee or co-trustees, or separate
trustee or separate trustees, of all or any part of the Trust Estate, and to
vest in such Person or Persons, in such capacity and for the benefit of the
Noteholders, such title to the Collateral, or any part thereof, and, subject to
the other provisions of this Section, such powers, duties, obligations, rights
and trusts as the Indenture Trustee may consider necessary or desirable. No
co-trustee or separate trustee hereunder shall be required to meet the terms of
eligibility as a successor trustee under Section 6.11 and no notice to
Noteholders of the appointment of any co-trustee or separate trustee shall be
required under this Section 6.10 hereof;

                                       41
<PAGE>

         (b) Every separate trustee and co-trustee shall, to the extent
permitted by law, be appointed and act subject to the following provisions and
conditions:

                  (i) all rights, powers, duties and obligations conferred or
         imposed upon the Indenture Trustee shall be conferred or imposed upon
         and exercised or performed by the Indenture Trustee and such separate
         trustee or co-trustee jointly (it being understood that such separate
         trustee or co-trustee is not authorized to act separately without the
         Indenture Trustee joining in such act), except to the extent that under
         any law of any jurisdiction in which any particular act or acts are to
         be performed the Indenture Trustee shall be incompetent or unqualified
         to perform such act or acts, in which event such rights, powers, duties
         and obligations (including the holding of title to the Collateral or
         any portion thereof in any such jurisdiction) shall be exercised and
         performed singly by such separate trustee or co-trustee, but solely at
         the direction of the Indenture Trustee;

                  (ii) no trustee hereunder shall be personally liable by reason
         of any act or omission of any other trustee hereunder; and

                  (iii) the Indenture Trustee may at any time accept the
         resignation of or remove any separate trustee or co-trustee.

         (c) Any notice, request or other writing given to the Indenture Trustee
shall be deemed to have been given to each of the then separate trustees and
co-trustees, as effectively as if given to each of them. Every instrument
appointing any separate trustee or co-trustee shall refer to this Indenture and
the conditions of this Article VI. Each separate trustee and co-trustee, upon
its acceptance of the trusts conferred, shall be vested with the estates or
property specified in its instrument of appointment, jointly with the Indenture
Trustee, subject to all the provisions of this Indenture, specifically including
every provision of this Indenture relating to the conduct of, affecting the
liability of, or affording protection to, the Indenture Trustee. Every such
instrument shall be filed with the Indenture Trustee.

         (d) Any separate trustee or co-trustee may at any time constitute the
Indenture Trustee its agent or attorney-in-fact with full power and authority,
to the extent not prohibited by law, to do any lawful act under or in respect of
this Indenture on its behalf and in its name. If any separate trustee or
co-trustee shall die, become incapable of acting, resign or be removed, all of
its estates, properties, rights, remedies and trusts shall vest in and be
exercised by the Indenture Trustee, to the extent permitted by law, without the
appointment of a new or successor trustee.

         Section 6.15. Eligibility. The Indenture Trustee shall at all times (i)
satisfy the requirements of TIA Section 310(a), (ii) have a combined capital and
surplus of at least $50,000,000 as set forth in its most recently published
annual report of condition, (iii) have a long-term debt rating equivalent to "A"
or better by the Rating Agencies or be otherwise acceptable to the Rating
Agencies and (iv) not be an Affiliate of the Issuer or the Owner Trustee. The
Indenture Trustee shall comply with TIA Section 310(b), including the optional
provision permitted by the second sentence of TIA Section 310(b)(9); provided,
however, that there shall be excluded from the operation of TIA Section
310(b)(1) any indenture or indentures under which other securities of the Issuer
are outstanding if the requirements for such exclusion set forth in TIA Section
310(b)(1) are met.

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<PAGE>

         Section 6.16. Representations and Warranties. The Indenture Trustee
hereby represents that:

         (a) the Indenture Trustee is duly organized and validly existing as a
national banking association in good standing under the laws of the United
States of America with power and authority to own its properties and to conduct
its business as such properties are currently owned and such business is
presently conducted;

         (b) the Indenture Trustee has the power and authority to execute and
deliver this Indenture and to carry out its terms; and the execution, delivery
and performance of this Indenture have been duly authorized by the Indenture
Trustee by all necessary corporate action;

         (c) the consummation of the transactions contemplated by this Indenture
and the fulfillment of the terms hereof do not conflict with, result in any
breach of any of the terms and provisions of, or constitute (with or without
notice or lapse of time) a default under the articles of organization or bylaws
of the Indenture Trustee or any material agreement or other material instrument
to which the Indenture Trustee is a party or by which it is bound; and

         (d) there are no proceedings or investigations pending or, to the
knowledge of the Indenture Trustee, threatened before any court, regulatory
body, administrative agency or other governmental instrumentality having
jurisdiction over the Indenture Trustee or its properties: (i) asserting the
invalidity of this Indenture, (ii) seeking to prevent the consummation of any of
the transactions contemplated by this Indenture or (iii) seeking any
determination or ruling that might materially and adversely affect the
performance by the Indenture Trustee of its obligations under, or the validity
or enforceability of, this Indenture.

         Section 6.17. Preferential Collection of Claims Against Issuer. The
Indenture Trustee shall comply with TIA Section 311(a), excluding any creditor
relationship listed in TIA Section 311(b). An Indenture Trustee which has
resigned or been removed shall be subject to TIA Section 311(a) to the extent
indicated therein.

                                   ARTICLE VII
                         NOTEHOLDERS' LISTS AND REPORTS

         Section 7.01. Issuer To Furnish Indenture Trustee Names and Addresses
of Noteholders. The Issuer will furnish or cause to be furnished to the
Indenture Trustee not more than five days after each Record Date, a list, in
such form as the Indenture Trustee may reasonably require, of the names and
addresses of the Holders of Notes as of such Record Date; provided, however,
that so long as the Indenture Trustee is the Note Registrar, no such list shall
be required to be furnished.

         Section 7.02. Preservation of Information; Communications to
Noteholders.

         (a) The Indenture Trustee shall preserve, in as current a form as is
reasonably practicable, the names and addresses of the Holders of Notes
contained in the most recent list furnished to the Indenture Trustee as provided
in Section 7.01 and the names and addresses of Holders of Notes received by the
Indenture Trustee in its capacity as Note Registrar. The Indenture Trustee may

                                       43
<PAGE>

destroy any list furnished to it as provided in such Section 7.01 upon receipt
of a new list so furnished.

         (b) Noteholders may communicate pursuant to TIA Section 312(b) with
other Noteholders with respect to their rights under this Indenture or under the
Notes.

         (c) The Issuer and the Indenture Trustee shall have the protection of
TIA Section 3l2(c).

         Section 7.04. Reports by Issuer.

         (a) The Issuer shall:

                  (i) file with the Indenture Trustee and the Commission in
         accordance with the rules and regulations prescribed from time to time
         by the Commission such additional information, documents and reports
         with respect to compliance by the Issuer with the conditions and
         covenants of this Indenture as may be required from time to time by
         such rules and regulations; and

                  (ii) supply to the Indenture Trustee (and the Indenture
         Trustee shall transmit by mail to all Noteholders described in TIA
         Section 313(c)) such summaries of any information, documents and
         reports required to be filed by the Issuer pursuant to clause (i) of
         this Section 7.03(a) and by rules and regulations prescribed from time
         to time by the Commission.

         (b) Unless the Issuer otherwise determines, the fiscal year of the
Issuer shall end on December 31 of each year.

         Section 7.06. Reports by Indenture Trustee. If required by TIA Section
313(a), within 60 days after each March 1, beginning with March 1, 2004, the
Indenture Trustee shall mail to each Noteholder as required by TIA Section
313(c) a brief report dated as of such date that complies with TIA Section
313(a). The Indenture Trustee also shall comply with TIA Section 313(b).

         A copy of each report at the time of its mailing to Noteholders shall
be filed by the Indenture Trustee with the Commission and each securities
exchange, if any, on which the Notes are listed. The Issuer shall notify the
Indenture Trustee if and when the Notes are listed on any securities exchange.

                                  ARTICLE VIII
                      ACCOUNTS, DISBURSEMENTS AND RELEASES

         Section 8.01. Collection of Money. Except as otherwise expressly
provided herein, the Indenture Trustee may demand payment or delivery of, and
shall receive and collect, directly and without intervention or assistance of
any fiscal agent or other intermediary, all money and other property payable to
or receivable by the Indenture Trustee pursuant to this Indenture. The Indenture
Trustee shall apply all such money received by it as provided in this Indenture.
Except as otherwise expressly provided in this Indenture, if any default occurs
in the making of any payment or performance under any agreement or instrument
that is part of the Collateral, the

                                       44
<PAGE>

Indenture Trustee may take such action as may be appropriate to enforce such
payment or performance, including the institution and prosecution of appropriate
Proceedings. Any such action shall be without prejudice to any right to claim a
Default or Event of Default under this Indenture and any right to proceed
thereafter as provided in Article V.

         Section 8.02. Establishment of Note Account; Payments on the Notes.

         (a) On or prior to the Closing Date, the Indenture Trustee shall
establish and maintain in its name the Trust Accounts, as provided in Article V
of the Sale and Servicing Agreement.

         (b) On each Payment Date, the Paying Agent (or, if the Indenture
Trustee acts as Paying Agent, the Indenture Trustee) shall distribute all
amounts on deposit in the Note Account in accordance with the report of the
Master Servicer, as provided in Section 5.06 of the Sale and Servicing
Agreement.

         (c) On each Payment Date and each Redemption Date, the Indenture
Trustee hereby authorizes the Owner Trustee or the Certificate Paying Agent, as
applicable, to make the distributions from the Certificate Account as required
pursuant to Section 5.08 of the Sale and Servicing Agreement.

         Section 8.04. Release of Collateral.

         (a) Subject to the payment of its fees and expenses pursuant to Section
6.07, the Indenture Trustee may, and when required by the provisions of this
Indenture or the Sale and Servicing Agreement shall, execute instruments to
release property from the lien of this Indenture, or convey the Indenture
Trustee's interest in the same, in a manner and under circumstances that are not
inconsistent with the provisions of this Indenture or the Sale and Servicing
Agreement. No party relying upon an instrument executed by the Indenture Trustee
as provided in this Article VIII shall be bound to ascertain the Indenture
Trustee's authority, inquire into the satisfaction of any conditions precedent
or see to the application of any monies.

         (b) Except as otherwise provided in subsections (c) and (d) of this
Section and the terms of the Operative Agreements, the Indenture Trustee shall
release property from the lien of this Indenture only upon receipt by it of an
Issuer Request accompanied by (i) an Officer's Certificate, (ii) an Opinion of
Counsel, (iii) certificates in accordance with TIA Sections 314(c) and (d)(1),
and (iv)(A) Independent Certificates in accordance with TIA Sections 314(c) and
314(d)(1) and meeting the applicable requirements of Section 11.01 hereof or (B)
an Opinion of Counsel in lieu of such Independent Certificates to the effect
that the TIA does not require any such Independent Certificates; provided that
no such Independent Certificates or Opinion of Counsel in lieu of such
Independent Certificates shall be necessary in respect of property released from
the lien of the Indenture in accordance with the provisions hereof if such
property consists solely of cash.

         (c) The Master Servicer or any Servicer, on behalf of the Issuer, shall
be entitled to obtain a release from the lien of this Indenture for any Mortgage
Loan and the Mortgaged Property at any time (i) after a payment by the Seller,
the Issuer or Thornburg Mortgage, Inc. of the Purchase Price of the Mortgage
Loan, (ii) after a Qualified Substitute Mortgage Loan is substituted for such
Mortgage Loan and payment of the Substitution Adjustment, if any, (iii)

                                       45
<PAGE>

after liquidation of the Mortgage Loan in accordance with the applicable
Servicing Agreement and the deposit of all Liquidation Proceeds and Insurance
Proceeds in the Collection Account, (iv) upon the termination of a Mortgage Loan
(due to, among other causes, a prepayment in full of the Mortgage Loan and sale
or other disposition of the related Mortgaged Property), or (v) as contemplated
by Article VII of the Sale and Servicing Agreement.

         (d) The Indenture Trustee shall, if requested by the Master Servicer or
any Servicer, temporarily release (or cause its custodian to temporarily
release) to such party the Mortgage File pursuant to the provisions of Section
4.06 of the Sale and Servicing Agreement.

         (e) The Indenture Trustee shall, at such time as there are no Notes
outstanding and all sums due to the Noteholders pursuant to the Sale and
Servicing Agreement and all fees and expenses of the Indenture Trustee, the
Master Servicer, the Administrator and the Custodian pursuant to this Indenture
have been paid, release any remaining portion of the Collateral that secured the
Notes from the lien of this Indenture and release to the holder of the Trust
Certificate or any other Person entitled thereto any funds then on deposit in
the Trust Accounts and assign or transfer any outstanding Yield Maintenance
Agreements.

         Section 8.07. Master Servicer's Monthly Statements. On each Payment
Date, the Indenture Trustee shall deliver the Master Servicer's monthly report
pursuant to Section 5.10 of the Sale and Servicing Agreement with respect to
such Payment Date to DTC and the Rating Agencies.

                                   ARTICLE IX
                             SUPPLEMENTAL INDENTURES

         Section 9.01. Supplemental Indentures Without Consent of Noteholders.

         (a) Without the consent of the Holders of any Notes but with prior
written notice to the Rating Agencies, with the prior written consent of the
Issuer (which requires the consent of the holder of the Trust Certificate) and
with the prior written consent of the Yield Maintenance Counterparty (but only
to the extent such supplemental indenture materially adversely affects the
amounts, priority or timing of payments under the Yield Maintenance Agreements),
the Indenture Trustee, when authorized by an Issuer Order, at any time and from
time to time, may enter into one or more indentures supplemental hereto (which
shall conform to the provisions of the Trust Indenture Act as in force at the
date of the execution thereof), in form satisfactory to the Indenture Trustee,
for any of the following purposes:

                  (i) to correct or amplify the description of any property at
         any time subject to the lien of this Indenture, or better to assure,
         convey and confirm unto the Indenture Trustee any property subject or
         required to be subjected to the lien of this Indenture, or to subject
         to the lien of this Indenture additional property;

                  (ii) to evidence the succession, in compliance with the
         applicable provisions hereof, of another person to the Issuer, and the
         assumption by any such successor of the covenants of the Issuer herein
         and in the Notes contained;

                                       46
<PAGE>

                  (iii) to add to the covenants of the Issuer, for the benefit
         of the Holders of the Notes, or to surrender any right or power herein
         conferred upon the Issuer;

                  (iv) to (A) cure any ambiguity, (B) correct or supplement any
         provision herein or in any supplemental indenture that may be
         inconsistent with any other provisions herein or in any supplemental
         indenture or to conform the provisions hereof to those of any Offering
         Document, (C) obtain a rating for a Class of Notes from a nationally
         recognized statistical rating organization, or (D) make any other
         provisions with respect to matters or questions arising under this
         Indenture; provided, however, that no such supplemental indenture
         entered into pursuant to clause (D) of this subparagraph (iv) shall
         adversely affect in any material respect the interests of any Holder
         not consenting thereto;

                  (v) to evidence and provide for the acceptance of the
         appointment hereunder of a successor trustee with respect to the Notes
         and to add to or change any of the provisions of this Indenture as
         shall be necessary to facilitate the administration of the trusts
         hereunder by more than one trustee, pursuant to the requirements of
         Article VI; or

                  (vi) to modify, eliminate or add to the provisions of this
         Indenture to such extent as shall be necessary to effect the
         qualification of this Indenture under the TIA or under any similar
         federal statute hereafter enacted and to add to this Indenture such
         other provisions as may be expressly required by the TIA.

provided, however, that no such supplemental indenture shall be entered into
unless the Indenture Trustee shall have received an Opinion of Counsel stating
that entering into such supplemental indenture will not (A) result in a
"substantial modification" of the Notes under Treasury Regulation Section
1.1001-3 or adversely affect the status of the Notes as indebtedness for federal
income tax purposes or (B) cause the Trust to be subject to an entity level tax.

         The Indenture Trustee is hereby authorized to join in the execution of
any such supplemental indenture and to make any further appropriate agreements
and stipulations that may be therein contained.

         (b) The Issuer and the Indenture Trustee, when authorized by an Issuer
Order, may also, without the consent of any Noteholder but with prior written
notice to the Rating Agencies and with the prior written consent of the Yield
Maintenance Counterparty (but only to the extent such supplemental indenture
materially adversely affects the amounts, priority or timing of payments under
the Yield Maintenance Agreements), enter into an indenture or indentures
supplemental hereto for the purpose of adding any provisions to, or changing in
any manner or eliminating any of the provisions of, this Indenture or of
modifying in any manner the rights of the Noteholders under this Indenture;
provided, however, that such action shall not, as evidenced by either (i) an
Opinion of Counsel or (ii) satisfaction of the Rating Agency Condition,
adversely affect in any material respect the interests of any Noteholder.

         Section 9.03. Supplemental Indentures with Consent of Noteholders. The
Issuer and the Indenture Trustee, when authorized by an Issuer Order, also may,
with the prior consent of the Rating Agencies, the written consent of the holder
of the Trust Certificate, the prior written consent of the Yield Maintenance
Counterparty (but only to the extent such supplemental

                                       47
<PAGE>

indenture materially adversely affects the amounts, priority or timing of
payments under the Yield Maintenance Agreements), and with the consent of
Holders of not less than 66-2/3% of the Outstanding Amount of Notes, enter into
an indenture or indentures supplemental hereto for the purpose of adding any
provisions to, or changing in any manner or eliminating any of the provisions
of, this Indenture or of modifying in any manner the rights of the Holders of
the Notes under this Indenture; provided, however, that no such supplemental
indenture shall, without the consent of the Holder of each Outstanding Note
affected thereby:

         (a) change the date of payment of any installment of principal of or
interest on any Note, or reduce the principal amount thereof, the interest rate
thereon, change the provisions of this Indenture relating to the application of
collections on, or the proceeds of the sale of, the Collateral to payment of
principal of or interest on the Notes, or change any place of payment where, or
the coin or currency in which, any Note or the interest thereon is payable, or
impair the right to institute suit for the enforcement of the provisions of this
Indenture requiring the application of funds available therefor, as provided in
Article V, to the payment of any such amount due on the Notes on or after the
respective due dates thereof (or, in the case of redemption, on or after the
Redemption Date);

         (b) reduce the percentage of the Outstanding Amount of the Notes, the
consent of the Holders of which is required for any such supplemental indenture,
or the consent of the Holders of which is required for any waiver of compliance
with certain provisions of this Indenture or certain defaults hereunder and
their consequences provided for in this Indenture;

         (c) modify or alter the provisions of the proviso to the definition of
the term "Outstanding";

         (d) reduce the percentage of the Outstanding Amount of the Notes
required to direct the Indenture Trustee to direct the Issuer to sell or
liquidate the Collateral pursuant to Section 5.04;

         (e) modify any provision of this Section except to increase any
percentage specified herein or to provide that certain additional provisions of
this Indenture or the Operative Agreements cannot be modified or waived without
the consent of the Holder of each Outstanding Note affected thereby;

         (f) modify any of the provisions of this Indenture in such manner as to
affect the calculation of the amount of any payment of interest or principal due
on any Note on any Payment Date; or

         (g) permit the creation of any lien ranking prior to or on a parity
with the lien of this Indenture with respect to any part of the Collateral or,
except as otherwise permitted or contemplated herein, terminate the lien of this
Indenture on any property at any time subject hereto or deprive the Holder of
any Note of the security provided by the lien of this Indenture.

         The Indenture Trustee may rely on an Opinion of Counsel (at the expense
of the party requesting the supplemental indenture) regarding whether or not any
Notes would be affected by any supplemental indenture and any such determination
shall be conclusive upon the Holders of all Notes, whether theretofore or
thereafter authenticated and delivered hereunder.

                                       48
<PAGE>

         In connection with requesting the consent of the Noteholders and the
holder of the Trust Certificate pursuant to this Section, the Issuer shall mail
to the Holders of the Notes to which such amendment or supplemental indenture
relates and to the Owner Trustee (which shall in turn mail to the holder of the
Trust Certificate) a notice setting forth in general terms the substance of such
supplemental indenture. It shall not be necessary for any Act of Noteholders
under this Section to approve the particular form of any proposed supplemental
indenture, but it shall be sufficient if such Act shall approve the substance
thereof.

         Section 9.04. Execution of Supplemental Indentures. In executing, or
permitting the additional trusts created by, any supplemental indenture
permitted by this Article IX or the modification thereby of the trusts created
by this Indenture, the Indenture Trustee shall be entitled to receive, and
subject to Sections 6.01 and 6.02, shall be fully protected in relying upon, an
Opinion of Counsel stating that the execution of such supplemental indenture is
authorized or permitted by this Indenture. The Indenture Trustee may, but shall
not be obligated to, enter into any such supplemental indenture that affects the
Indenture Trustee's own rights, duties, liabilities or immunities under this
Indenture or otherwise.

         Section 9.05. Effect of Supplemental Indenture. Upon the execution of
any supplemental indenture pursuant to the provisions hereof, this Indenture
shall be and shall be deemed to be modified and amended in accordance therewith
with respect to the Notes affected thereby, and the respective rights,
limitations of rights, obligations, duties, liabilities and immunities under
this Indenture of the Indenture Trustee, the Issuer and the Holders of the Notes
shall thereafter be determined, exercised and enforced hereunder subject in all
respects to such modifications and amendments, and all the terms and conditions
of any such supplemental indenture shall be and be deemed to be part of the
terms and conditions of this Indenture for any and all purposes.

         Section 9.06. Conformity with Trust Indenture Act. Every amendment of
this Indenture and every supplemental indenture executed pursuant to this
Article IX shall conform to the requirements of the Trust Indenture Act as then
in effect so long as this Indenture shall then be qualified under the Trust
Indenture Act.

         Section 9.07. Reference in Notes to Supplemental Indentures. Notes
authenticated and delivered after the execution of any supplemental indenture
pursuant to this Article IX may, and if required by the Indenture Trustee shall,
bear a notation in form approved by the Indenture Trustee as to any matter
provided for in such supplemental indenture. If the Issuer or the Indenture
Trustee shall so determine, new Notes so modified as to conform, in the opinion
of the Indenture Trustee and the Issuer, to any such supplemental indenture may
be prepared and executed by the Issuer and authenticated and delivered by the
Indenture Trustee in exchange for Outstanding Notes.

         Section 9.08. Amendments to Trust Agreement. The Indenture Trustee
shall, upon Issuer Order, consent to any proposed amendment to the Trust
Agreement or an amendment to or waiver of any provision of any other document
relating to the Trust Agreement, such consent to be given without the necessity
of obtaining the consent of the Holders of any Notes upon satisfaction of the
requirements under Section 10.01 of the Trust Agreement.

                                       49
<PAGE>

         Nothing in this Section shall be construed to require that any Person
obtain the consent of the Indenture Trustee to any amendment or waiver or any
provision of any document where the making of such amendment or the giving of
such waiver without obtaining the consent of the Indenture Trustee is not
prohibited by this Indenture or by the terms of the document that is the subject
of the proposed amendment or waiver.

                                   ARTICLE X
         DISPOSITION OF THE COLLATERAL; REDEMPTION OR CALL OF THE NOTES

         Section 10.01. Redemption or Call of the Notes.

         (a) Thornburg will have an assignable option to call all outstanding
Notes, in whole but not in part, on any Payment Date on or after the Optional
Notes Purchase Date in the manner specified herein and subject to the provisions
of Section 7.02 of the Sale and Servicing Agreement. Upon such optional call the
Notes shall remain outstanding and neither the lien of the Indenture with
respect to the Collateral securing the Notes nor the Notes shall be terminated.
The Notes shall not merge with the security therefor, but shall remain validly
outstanding, subject to the following paragraph. The Indenture Trustee, if so
directed by Thornburg or the applicable holder of the Optional Notes Purchase
Right shall notify the Indenture Trustee in writing not less than eight (8)
Business Days prior to the Optional Notes Purchase Date that it is exercising
the Optional Notes Purchase Right and the Optional Notes Purchase Date on which
it shall purchase the Notes. In such event, the Indenture Trustee shall
authenticate and prepare for delivery on such Optional Notes Purchase Date new
Notes evidencing Book-Entry Notes or Definitive Notes (as directed by Thornburg
or the holder of the Optional Notes Purchase Right) and shall issue such new
Notes against receipt by the Indenture Trustee of immediately available funds in
an amount not less than the Note Purchase Price on the Optional Notes Purchase
Date.

         (b) Thornburg may effect an early redemption in the manner specified in
and subject to the provisions of Section 7.03 of the Sale and Servicing
Agreement.

         (c) The Indenture Trustee shall furnish the Rating Agencies notice of
any such call or redemption in accordance with Section 10.02 hereof.

         (d) Notwithstanding the foregoing, no redemption of any Note shall be
permitted without retiring the then-outstanding Notes and no sale of previously
redeemed Notes may be made by Thornburg unless Thornburg shall have delivered to
the Indenture Trustee an Opinion of Counsel that such redemption without
retirement or sale, as the case may be, does not violate any provision of the
TIA or other applicable law.

         Section 10.03. Form of Redemption or Call Notice. Notice of redemption
or call under Section 10.01 hereof shall be given by the Indenture Trustee by
first-class mail, postage prepaid, or by facsimile mailed or transmitted not
later than 10 days prior to the applicable Redemption Date or Optional Notes
Purchase Date to each then Holder of each Class of Notes to be redeemed or
called at such Holder's address or facsimile number appearing in the Note
Register.

         All notices of redemption or call shall state:

         (a) the Redemption Date or Optional Notes Purchase Date, as applicable;

                                       50
<PAGE>

         (b) the Redemption Price or Note Purchase Price, as applicable;

         (c) that on the Optional Notes Purchase Date, (i) the Note Purchase
Price will become due and payable only with respect to the then Holders of Notes
and that the amount payable in respect of the called Notes shall be limited to
the Note Purchase Price therefor and (ii) that interest thereon shall cease to
accrue on the date specified on the notice for the benefit of, and that payment
of the Note Purchase Price will be made to, the Persons whose names appear as
the registered holders thereof on the Note Register as of the Record Date
applicable to such Optional Notes Purchase Date and identified in such notice of
call;

         (d) that on a Redemption, (i) interest thereon shall cease to accrue on
the date specified on the notice and (ii) that the payment of all other amounts
described in Section 7.03 of the Sale and Servicing Agreement will be made; and

         (e) the place where such Notes are to be surrendered for payment of the
Redemption Price or Note Purchase Price (which shall be the office or agency of
the Issuer to be maintained as provided in Section 3.02 hereof).

         Notice of redemption or call of the Notes shall be given by the
Indenture Trustee in the name of the Issuer and at the expense of Thornburg or
its assignee. Failure to give to any Holder of any Note notice of redemption or
call, or any defect therein, shall not impair or affect the validity of the
redemption or call of any other Note.

         Section 10.04. Notes Payable on Redemption Date or Note Payment Date.
Each Class of Notes to be redeemed or called shall, following notice of such
redemption or call as required by Section 10.02 hereof on the applicable
Redemption Date or Note Payment Date become due and payable at the Redemption
Price or Note Payment Price and (except pursuant to Section 10.01(a) or unless
Thornburg shall default in the payment of the Redemption Price or the Note
Purchase Price, as applicable) no interest shall accrue thereon (for the benefit
of the prior Holder of a Note in the case of the Optional Notes Purchase Date)
for any period after the date to which accrued interest is calculated for
purposes of calculating the Redemption Price or Note Purchase Price. The Issuer
may not redeem any Class of Notes unless (i) all outstanding obligations under
such Class of Notes have been paid in full and (ii) the Indenture Trustee has
been paid all amounts to which it is entitled hereunder.

                                   ARTICLE XI
                                  MISCELLANEOUS

         Section 11.01. Compliance Certificates and Opinions, etc.

         (a) Upon any application or request by the Issuer to the Indenture
Trustee to take any action under any provision of this Indenture, the Issuer
shall furnish to the Indenture Trustee (a) an Officer's Certificate stating that
all conditions precedent, if any, provided for in this Indenture relating to the
proposed action have been complied with, (b) an Opinion of Counsel stating that
in the opinion of such counsel all such conditions precedent, if any, have been
complied with, and (c) (if required by Section 3.14(c) or any other Section of
the TIA) an Independent Certificate from a firm of certified public accountants
meeting the applicable requirements of this Section, except that, in the case of
any such application or request as to which the furnishing

                                       51
<PAGE>

of such documents is specifically required by any provision of this Indenture,
no additional certificate or opinion need be furnished. Every certificate or
opinion with respect to compliance with a condition or covenant provided for in
this Indenture shall include:

                  (i) a statement that each signatory of such certificate or
         opinion has read such covenant or condition and the definitions herein
         relating thereto;

                  (ii) a brief statement as to the nature and scope of the
         examination or investigation upon which the statements or opinions
         contained in such certificate or opinion are based;

                  (iii) a statement that, in the opinion of each such signatory,
         such signatory has made such examination or investigation as is
         necessary to enable such signatory to express an informed opinion as to
         whether or not such covenant or condition has been complied with; and

                  (iv) a statement as to whether or not, in the opinion of each
         such signatory, such condition or covenant has been complied with.

         (b) Prior to the deposit of any Collateral or other property or
securities with the Indenture Trustee that is to be made the basis for the
release of any property or securities subject to the lien of this Indenture, the
Issuer shall, in addition to any obligation imposed in Section 11.01(a) hereof
or elsewhere in this Indenture, furnish to the Indenture Trustee an Officer's
Certificate certifying or stating the opinion of each person signing such
certificate as to the fair value (within 90 days of such deposit) to the Issuer
of the Collateral or other property or securities to be so deposited.

         (c) Whenever the Issuer is required to furnish to the Indenture Trustee
an Officer's Certificate certifying or stating the opinion of any signer thereof
as to the matters described in subsection (b) above, the Issuer shall also
deliver to the Indenture Trustee an Independent Certificate as to the same
matters, if the fair value to the Issuer of the securities to be so deposited
and of all other such securities made the basis of any such withdrawal or
release since the commencement of the then-current fiscal year of the Issuer, as
set forth in the certificates delivered pursuant to subsection (b) above and
this subsection (c), is 10% or more of the Note Principal Amount of the Notes,
but such a certificate need not be furnished with respect to any securities so
deposited, if the fair value thereof to the Issuer as set forth in the related
Officer's Certificate is less than $25,000 or less than one percent of the Note
Principal Amount of the Notes.

         (d) Whenever any property or securities are to be released from the
lien of this Indenture, the Issuer shall also furnish to the Indenture Trustee
an Officer's Certificate certifying or stating the opinion of each person
signing such certificate as to the fair value (within 90 days of such release)
of the property or securities proposed to be released and stating that in the
opinion of such person the proposed release will not impair the security under
this Indenture in contravention of the provisions hereof.

         (e) Whenever the Issuer is required to furnish to the Indenture Trustee
an Officer's Certificate certifying or stating the opinion of any signer thereof
as to the matters described in

                                       52
<PAGE>

subsection (d) above, the Issuer shall also furnish to the Indenture Trustee an
Independent Certificate as to the same matters if the fair value of the property
or securities and of all other property or securities released from the lien of
this Indenture since the commencement of the then-current calendar year, as set
forth in the certificates required by subsection (d) above and this subsection
(e), equals 10% or more of the Note Principal Amount of the Notes, but such
certificate need not be furnished in the case of any release of property or
securities if the fair value thereof as set forth in the related Officer's
Certificate is less than $25,000 or less than one percent of the then Note
Principal Amount of the Notes.

         (f) The provisions set forth in Sections 11.01(b), (c), (d) and (e)
hereof shall not apply to any repurchases, optional purchases, substitutions,
calls, redemptions or optional terminations carried out in accordance with the
provisions of Article X of this Indenture or Sections 3.03, 3.04, 4.18, 4.28,
7.02 and 7.03 of the Sale and Servicing Agreement.

         Section 11.02. Form of Documents Delivered to Indenture Trustee. In any
case where several matters are required to be certified by, or covered by an
opinion of, any specified Person, it is not necessary that all such matters be
certified by, or covered by the opinion of, only one such Person, or that they
be so certified or covered by only one document, but one such Person may certify
or give an opinion with respect to some matters and one or more other such
Persons as to other matters, and any such Person may certify or give an opinion
as to such matters in one or several documents.

         Any certificate or opinion of an Authorized Officer of the Issuer may
be based, insofar as it relates to legal matters, upon a certificate or opinion
of, or representations by, counsel, unless such officer knows, or in the
exercise of reasonable care should know, that the certificate or opinion or
representations with respect to the matters upon which such officer's
certificate or opinion is based are erroneous. Any such certificate of an
Authorized Officer or Opinion of Counsel may be based, insofar as it relates to
factual matters, upon a certificate or opinion of, or representations by, an
officer or officers of the Seller, the Depositor or the Issuer stating that the
information with respect to such factual matters is in the possession of the
Seller, the Depositor or the Issuer unless such counsel knows, or in the
exercise of reasonable care should know, that the certificate or opinion or
representations with respect to such matters are erroneous.

         Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

         Whenever in this Indenture, in connection with any application or
certificate or report to the Indenture Trustee, it is provided that the Issuer
shall deliver any document as a condition of the granting of such application,
or as evidence of the Issuer's compliance with any term hereof, it is intended
that the truth and accuracy, at the time of the granting of such application or
at the effective date of such certificate or report (as the case may be), of the
facts and opinions stated in such document shall in such case be conditions
precedent to the right of the Issuer to have such application granted or to the
sufficiency of such certificate or report. The foregoing shall not, however, be
construed to affect the Indenture Trustee's right to rely upon the truth and
accuracy of any statement or opinion contained in any such document as provided
in Article VI.

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<PAGE>

         Section 11.03. Acts of Noteholders.

         (a) Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given or taken by
Noteholders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Noteholders in person or by agents
duly appointed in writing; and except as herein otherwise expressly provided
such action shall become effective when such instrument or instruments are
delivered to the Indenture Trustee, and, where it is hereby expressly required,
to the Issuer. Such instrument or instruments (and the action embodied therein
and evidenced thereby) are herein sometimes referred to as the "Act" of the
Noteholders signing such instrument or instruments. Proof of execution of any
such instrument or of a writing appointing any such agent shall be sufficient
for any purpose of this Indenture and (subject to Section 6.01) conclusive in
favor of the Indenture Trustee and the Issuer, if made in the manner provided in
this Section.

         (b) The fact and date of the execution by any person of any such
instrument or writing may be proved in any manner that the Indenture Trustee
deems sufficient.

         (c) The ownership of Notes shall be proved by the Note Register.

         (d) Any request, demand, authorization, direction, notice, consent,
waiver or other action by the Holder of any Notes shall bind the Holder of every
Note issued upon the registration thereof or in exchange therefor or in lieu
thereof, in respect of anything done, omitted or suffered to be done by the
Indenture Trustee or the Issuer in reliance thereon, whether or not notation of
such action is made upon such Note.

         Section 11.04. Notices, etc. to Indenture Trustee, the Issuer and
Rating Agencies. Any request, demand, authorization, direction, notice, consent,
waiver or Act of Noteholders or other documents provided or permitted by this
Indenture shall be in writing and if such request, demand, authorization,
direction, notice, consent, waiver or act of Noteholders is to be made upon,
given or furnished to or filed with:

         (a) the Indenture Trustee by any Noteholder or by the Issuer shall be
sufficient for every purpose hereunder if made, given, furnished or filed in
writing to or with the Indenture Trustee at its Corporate Trust Office, or

         (b) the Issuer by the Indenture Trustee or by any Noteholder shall be
sufficient for every purpose hereunder if in writing and mailed first-class,
postage prepaid to the Issuer addressed to: Thornburg Mortgage Securities Trust
2003-6, in care of Wilmington Trust Company, Rodney Square North, 1100 North
Market Street, Wilmington, Delaware 19890, Attention: Corporate Trust
Administrator (Thornburg 2003-6), or at any other address previously furnished
in writing to the Indenture Trustee by the Issuer or the Administrator. The
Issuer shall promptly transmit any notice received by it from the Noteholders to
the Indenture Trustee.

         (c) Any notice required to be given to the Seller or Lehman Brothers
Inc. pursuant to Section 6.07 shall be sufficient for every purpose hereunder if
in writing and delivered by first-class mail, postage prepaid, overnight courier
or facsimile to such parties addressed to the Seller at 150 Washington Avenue,
Suite 302, Santa Fe, New Mexico 87501, Attention: Deborah J.

                                       54
<PAGE>

Burns, Vice President-Mortgage Loan Securitization, or to Lehman Brothers Inc.
at 745 Seventh Avenue, 7th Floor, New York, New York 10019, Attention: Legal.

         Notices required to be given to the Rating Agencies by the Issuer, the
Indenture Trustee or the Owner Trustee shall be in writing, personally delivered
or mailed by certified mail, return receipt requested by overnight courier or
facsimile, if to Moody's: Moody's Investors Service, Inc., 99 Church Street, New
York, New York 10007, Attention: Residential Mortgage Surveillance and if to
S&P: Standard & Poor's Ratings Services, a division of The McGraw-Hill
Companies, Inc., 55 Water Street, New York, New York 10041, Attention:
Residential Mortgage Surveillance.

         Section 11.05. Notices to Noteholders; Waiver. Where this Indenture
provides for notice to Noteholders of any event, such notice shall be
sufficiently given (unless otherwise herein expressly provided) if in writing
and delivered by first-class mail, postage prepaid, overnight courier or
facsimile to each Noteholder affected by such event, at his address as it
appears on the Note Register, not later than the latest date, and not earlier
than the earliest date, prescribed for the giving of such notice. In any case
where notice to Noteholders is given by mail, neither the failure to mail such
notice nor any defect in any notice so mailed to any particular Noteholder shall
affect the sufficiency of such notice with respect to other Noteholders, and any
notice that is mailed in the manner herein provided shall conclusively be
presumed to have been duly given.

         Where this Indenture provides for notice in any manner, such notice may
be waived in writing by any Person entitled to receive such notice, either
before or after the event, and such waiver shall be the equivalent of such
notice. Waivers of notice by Noteholders shall be filed with the Indenture
Trustee but such filing shall not be a condition precedent to the validity of
any action taken in reliance upon such a waiver.

         In case, by reason of the suspension of regular mail service as a
result of a strike, work stoppage or similar activity, it shall be impractical
to mail notice of any event to Noteholders when such notice is required to be
given pursuant to any provision of this Indenture, then any manner of giving
such notice as shall be satisfactory to the Indenture Trustee shall be deemed to
be a sufficient giving of such notice.

         Section 11.06. Conflict with Trust Indenture Act. If any provision
hereof limits, qualifies or conflicts with another provision hereof that is
required to be included in this Indenture by any of the provisions of the Trust
Indenture Act, such required provision shall control.

         The provisions of TIA Sections 310 through 317 that impose duties on
any person (including the provisions automatically deemed included herein unless
expressly excluded by this Indenture) are a part of and govern this Indenture,
whether or not physically contained herein.

         Section 11.07. Effect of Headings and Table of Contents. The Article
and Section headings herein and the Table of Contents are for convenience only
and shall not affect the construction hereof.

                                       55
<PAGE>

         Section 11.08. Successors and Assigns. All covenants and agreements in
this Indenture and the Notes by the Issuer shall bind its successors and
assigns, whether so expressed or not. All agreements of the Indenture Trustee in
this Indenture shall bind its successors, co-trustees and agents.

         Section 11.09. Severability. In case any provision in this Indenture or
in the Notes shall be invalid, illegal or unenforceable, the validity, legality,
and enforceability of the remaining provisions shall not in any way be affected
or impaired thereby.

         Section 11.10. Benefits of Indenture and Consent of Noteholders.
Nothing in this Indenture or in the Notes, express or implied, shall give to any
Person, other than the parties hereto and their successors hereunder, and the
Noteholders, and any other party secured hereunder, and any other Person with an
ownership interest in any part of the Collateral, any benefit or any legal or
equitable right, remedy or claim under this Indenture. Each Noteholder and Note
Owner, by acceptance of a Note or, in the case of a Note Owner, a beneficial
interest in a Note, consents to and agrees to be bound by the terms and
conditions of this Indenture.

         Section 11.11. Legal Holidays. In any case where the date on which any
payment is due shall not be a Business Day, then (notwithstanding any other
provision of the Notes or this Indenture) payment need not be made on such date,
but may be made on the next succeeding Business Day with the same force and
effect as if made on the date on which nominally due, and no interest shall
accrue for the period from and after any such nominal date.

         Section 11.12. Governing Law. THIS INDENTURE SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT
REFERENCE TO ITS CONFLICT OF LAW PROVISIONS (OTHER THAN SECTION 5-1401 OF THE
GENERAL OBLIGATIONS LAW), AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE
PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

         Section 11.13. Counterparts. This Indenture may be executed in any
number of counterparts, each of which so executed shall be deemed to be an
original, but all such counterparts shall together constitute but one and the
same instrument.

         Section 11.14. Recording of Indenture. If this Indenture is subject to
recording in any appropriate public recording offices, such recording is to be
effected by the Issuer and at its expense accompanied by an Opinion of Counsel
at its expense (which may be counsel to the Indenture Trustee or any other
counsel reasonably acceptable to the Indenture Trustee) to the effect that such
recording is necessary either for the protection of the Noteholders or any other
Person secured hereunder or for the enforcement of any right or remedy granted
to the Indenture Trustee under this Indenture.

         Section 11.15. Issuer Obligations. No recourse may be taken, directly
or indirectly, with respect to the obligations of the Issuer, the Owner Trustee,
the Master Servicer or the Indenture Trustee on the Notes or under this
Indenture or any certificate or other writing delivered in connection herewith
or therewith, against (i) the Indenture Trustee, the Master Servicer or the
Owner Trustee in its individual capacity, (ii) any owner of a beneficial
interest in the Issuer or

                                       56
<PAGE>

(iii) any partner, owner, shareholder, member, beneficiary, agent, officer,
director or employee of the Indenture Trustee, the Master Servicer or the Owner
Trustee in its individual capacity, any holder of a beneficial interest in the
Issuer, the Owner Trustee, the Master Servicer or the Indenture Trustee or of
any successor or assign of the Indenture Trustee or the Owner Trustee in its
individual capacity, except as any such Person may have expressly agreed (it
being understood that the Indenture Trustee and the Owner Trustee have no such
obligations in their individual capacity). For all purposes of this Indenture,
in the performance of any duties or obligations of the Issuer hereunder, the
Owner Trustee shall be subject to, and entitled to the benefits of, the terms
and provisions of Article V, VI and VII of the Trust Agreement.

         Section 11.16. No Petition. The Indenture Trustee, by entering into
this Indenture, and each Noteholder, by its acceptance of a Note, hereby
covenant and agree that they will not at any time institute against the Seller,
the Depositor or the Issuer or join in any institution against the Seller, the
Depositor or the Issuer, any bankruptcy, reorganization, arrangement, insolvency
or liquidation proceedings, or other proceedings under any United States federal
or state bankruptcy or similar law in connection with any obligations relating
to the Notes, this Indenture or any of the other Operative Agreements, provided,
however, that nothing herein shall be deemed to prohibit the Indenture Trustee
from filing proofs of claim for itself and on behalf of the Noteholders.

         Section 11.17. Inspection. The Issuer agrees that, on reasonable prior
notice, it will permit any representative of the Indenture Trustee during the
Issuer's normal business hours, to examine all the books of account, records,
reports and other papers of the Issuer, to make copies and extracts therefrom,
to cause such books to be audited by Independent certified public accountants,
and to discuss the Issuer's affairs, finances and accounts with the Issuer's
officers, employees, and Independent certified public accountants, all at such
reasonable times and as often as may be reasonably requested. The Indenture
Trustee shall and shall cause its representatives to hold in confidence all such
information except to the extent disclosure may be required by law (and all
reasonable applications for confidential treatment are unavailing) and except to
the extent that the Indenture Trustee may reasonably determine that such
disclosure is consistent with its obligations hereunder.

         Section 11.18. Execution by the Issuer. It is expressly understood and
agreed by the parties hereto that (a) this Indenture is executed and delivered
by Wilmington Trust Company, not individually or personally but solely as Owner
Trustee of the Issuer, in the exercise of the powers and authority conferred and
vested in its as trustee, (b) each of the representations, undertaking and
agreements herein made on the part of the Issuer is made and intended not as
personal representations, undertakings and agreements by Wilmington Trust
Company but is made and intended for the purpose of binding only the Issuer, (c)
nothing herein contained shall be construed as creating any liability on
Wilmington Trust Company, individually or personally, to perform any covenant
either expressed or implied contained herein, all such liability, if any, being
expressly waived by the parties and by any person claiming by, through or under
the parties hereto and (d) under no circumstances shall Wilmington Trust Company
be personally liable for the payment of any indebtedness or expenses of the
Issuer or be liable for the breach or failure of any obligation,
representations, warranty or covenant made or undertaken by the Issuer under
this Indenture or any other document.

                                       57
<PAGE>

         IN WITNESS WHEREOF, the Issuer and the Indenture Trustee have caused
this Indenture to be duly executed by their respective officers, thereunto duly
authorized and duly attested, all as of the day and year first above written.

                                           THORNBURG MORTGAGE SECURITIES TRUST
                                           2003-6, as Issuer

                                           By: WILMINGTON TRUST COMPANY,
                                               not in its individual capacity
                                               but solely as Owner Trustee

                                           By:
                                               --------------------------------
                                                Name:
                                                Title:

                                           DEUTSCHE BANK NATIONAL TRUST COMPANY,
                                           as Indenture Trustee

                                           By:
                                               --------------------------------
                                                Name:
                                                Title:

                                           By:
                                               --------------------------------
                                                Name:
                                                Title:

<PAGE>

Solely for the purposes of Section 6.06,
accepted and agreed to by:

WELLS FARGO BANK MINNESOTA,
  NATIONAL BANK, as Master Servicer

By:
   --------------------------------
   Name:
   Title:

<PAGE>

STATE OF DELAWARE          )
                           )
COUNTY OF NEWCASTLE        )

         BEFORE ME, the undersigned authority, a Notary Public in and for said
county and state, on this day personally appeared ________________________,
known to me to be the person and officer whose name is subscribed to the
foregoing instrument and acknowledged to me that the same was the act of the
said WILMINGTON TRUST COMPANY, not in its individual capacity, but solely as
Owner Trustee on behalf of THORNBURG MORTGAGE SECURITIES TRUST 2003-6, a
Delaware statutory trust, and that such person executed the same as the act of
said statutory trust for the purpose and consideration therein expressed, and in
the capacities therein stated.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this ____ day of December 2003.

                                  ----------------------------------------------
                                  Notary Public in and for the State of Delaware

My commission expires:

----------------------

<PAGE>

STATE OF CALIFORNIA        )
                           )
COUNTY OF                  )

         BEFORE ME, the undersigned authority, a Notary Public in and for said
county and state, on this day personally appeared ___________________________,
known to me to be the person and officer whose name is subscribed to the
foregoing instrument and acknowledged to me that the same was the act of
DEUTSCHE BANK NATIONAL TRUST COMPANY, a New York banking corporation, and that
such person executed the same as the act of said corporation for the purpose and
consideration therein stated.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this ____ day of December 2003.

                                ------------------------------------------------
                                Notary Public in and for the State of California

My commission expires:

----------------------

<PAGE>

STATE OF CALIFORNIA        )
                           )
COUNTY OF                  )

         BEFORE ME, the undersigned authority, a Notary Public in and for said
county and state, on this day personally appeared ____________________________,
known to me to be the person and officer whose name is subscribed to the
foregoing instrument and acknowledged to me that the same was the act of
DEUTSCHE BANK NATIONAL TRUST COMPANY, a New York banking corporation, and that
such person executed the same as the act of said corporation for the purpose and
consideration therein stated.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this ____ day of December 2003.

                                ------------------------------------------------
                                Notary Public in and for the State of California

My commission expires:

----------------------

<PAGE>

                                   EXHIBIT A-1

                      FORM OF CLASS A-1 AND CLASS A-2 NOTE

         UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO ISSUER OR ITS AGENT
FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY NOTE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

         THIS NOTE DOES NOT EVIDENCE AN OBLIGATION OF OR AN INTEREST IN, AND IS
NOT GUARANTEED BY, THE DEPOSITOR, THE MASTER SERVICER, THE INDENTURE TRUSTEE,
THE OWNER TRUSTEE, OR ANY AFFILIATE OF ANY OF THEM AND IS NOT INSURED OR
GUARANTEED BY ANY GOVERNMENTAL AGENCY OR PRIVATE INSURER.

         THE PRINCIPAL OF THIS NOTE IS PAYABLE IN INSTALLMENTS AS SET FORTH
HEREIN. ACCORDINGLY, THE OUTSTANDING PRINCIPAL AMOUNT OF THIS NOTE AT ANY TIME
MAY BE LESS THAN THE AMOUNT SHOWN ON THE FACE HEREOF.

         (I) THIS NOTE MAY NOT BE ACQUIRED FOR, OR WITH THE ASSETS OF, AN
EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT ARRANGEMENT THAT IS SUBJECT TO SECTION
406 OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED
("ERISA"), OR TO SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED
(OR TO ANY SUBSTANTIALLY SIMILAR LAW ("SIMILAR LAW")), OR ANY ENTITY DEEMED TO
HOLD THE PLAN ASSETS OF THE FOREGOING (A "BENEFIT PLAN") OR (II) THE ACQUISITION
AND HOLDING OF SUCH NOTE FOR, OR WITH THE ASSETS OF, A BENEFIT PLAN WILL NOT
RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
SECTION 4975 OF THE CODE WHICH IS NOT COVERED UNDER PROHIBITED TRANSACTION CLASS
EXEMPTION ("PTCE") 84-14, PTCE 90-1, PTCE 91-38, PTCE 95-60, PTCE 96-23 OR SOME
OTHER APPLICABLE EXEMPTION, AND WILL NOT RESULT IN A NON-EXEMPT VIOLATION OF ANY
SIMILAR LAW.

<PAGE>

                   THORNBURG MORTGAGE SECURITIES TRUST 2003-6,
                          [CLASS A-1][CLASS A-2] NOTES

<TABLE>
<S>                                                <C>
Aggregate Original Principal Amount of the         Original Principal Amount of this Note:
[Class A-1][Class A-2] Notes:  $___________        $____________

INTEREST RATE: Adjustable                          CUSIP: __________

Number: ___
</TABLE>

         THORNBURG MORTGAGE SECURITIES TRUST 2003-6, a statutory trust organized
and existing under the laws of the State of Delaware (herein referred to as the
"Issuer"), for value received, hereby promises to pay to CEDE & CO., or
registered assigns, the principal sum of __________________ DOLLARS AND NO/100
($ ) payable on each Payment Date in an amount equal to the result obtained by
multiplying (A) a fraction the numerator of which is $___________ and the
denominator of which is the aggregate original principal amount of all [Class
A-1][Class A-2] Notes issued on the Closing Date, by (B) the aggregate amount,
if any, payable from the Note Account in respect of principal on the [Class
A-1][Class A-2] Notes pursuant to Section 5.06 of the sale and servicing
agreement, dated as of December 1, 2003 (the "Sale and Servicing Agreement"),
among the Issuer, Thornburg Mortgage Home Loans, Inc., as Seller, Structured
Asset Securities Corporation, as Depositor, Wells Fargo Bank Minnesota, National
Association, as Master Servicer and Deutsche Bank National Trust Company, a
national banking association, as Indenture Trustee (the "Indenture Trustee");
provided, however, that the entire unpaid principal amount of this Note shall be
due and payable on the Payment Date occurring in December 2033 (the "Maturity
Date") or as otherwise specified in the Indenture dated as of December 1, 2003
(the "Indenture"), between the Issuer and Indenture Trustee. Capitalized terms
used but not defined herein are as defined in the Indenture and the Sale and
Servicing Agreement, which agreements also contain rules as to construction that
shall be applicable herein.

         The Issuer shall pay interest on this Note at a per annum rate equal to
the Note Interest Rate, on the principal amount of this Note outstanding on the
immediately preceding Payment Date (after giving effect to all payments of
principal made on such preceding Payment Date) on each Payment Date until the
principal of this Note is paid or made available for payment in full.

         Interest on this Note will accrue for each Payment Date during the
period beginning on the immediately preceding Payment Date (or December 22,
2003, in the case of the first Accrual Period) and ending on the day immediately
preceding the related Payment Date (each, an "Accrual Period"). Interest will be
computed on the basis of a 360-day year consisting of twelve 30-day months. Such
principal of and interest on this Note shall be paid in the manner specified on
the reverse hereof.

         The principal of and interest on this Note are payable in such coin or
currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts. All payments made by the Issuer
with respect to this Note shall be applied first to interest due and payable on
this Note as provided above and then to the unpaid principal of this Note.

                                      A-1-2
<PAGE>

         Reference is made to the further provisions of this Note set forth on
the reverse hereof, which shall have the same effect as though fully set forth
on the face of this Note.

         Unless the certificate of authentication hereon has been executed by
the Indenture Trustee whose name appears below by manual signature, this Note
shall not be entitled to any benefit under the Indenture referred to on the
reverse hereof, or be valid or obligatory for any purpose.

                                      A-1-3

<PAGE>

         IN WITNESS WHEREOF, the Issuer has caused this instrument to be signed,
manually or in facsimile, by its Authorized Officer, as of the date set forth
below.

                                      THORNBURG MORTGAGE SECURITIES TRUST 2003-6

                                      By: WILMINGTON TRUST COMPANY,
                                          not in its individual capacity but
                                          solely as Owner Trustee under the
                                          Trust Agreement

                                      By:
                                          --------------------------------------
                                          Authorized Signatory

                                      Dated: December ___, 2003

                INDENTURE TRUSTEE'S CERTIFICATE OF AUTHENTICATION

         This is one of the Notes designated above and referred to in the
within-mentioned Indenture.

                                      DEUTSCHE BANK NATIONAL TRUST COMPANY,
                                          not in its individual capacity but
                                          solely as Indenture Trustee,

                                      By:
                                          --------------------------------------
                                          Authorized Signatory

                                      Dated: December ___, 2003

                                     A-1-4
<PAGE>

                   THORNBURG MORTGAGE SECURITIES TRUST 2003-6

         This Note is one of a duly authorized issue of Notes of the Issuer, all
issued under the Indenture, to which Indenture and all indentures supplemental
thereto reference is hereby made for a statement of the respective rights and
obligations thereunder of the Issuer, the Indenture Trustee and the Holders of
the Notes. To the extent that any provision of this Note contradicts or is
inconsistent with the provisions of the Indenture, the provisions of the
Indenture shall control and supersede such contradictory or inconsistent
provision herein. This Note is subject to all terms of the Indenture.

         The Class A-1 and Class A-2 Notes (the "Senior Notes") are, and will
be, equally and ratably secured by the collateral pledged as security therefor
as provided in the Indenture. The rights of the Holders of the Class M Notes and
the holder of the Trust Certificate to receive payments or distribution of
interest and principal are, and will be, subordinate to the rights of the
Holders of the Senior Notes to receive payments of interest, as provided in the
Indenture.

         Principal of this Note will be payable on each Payment Date in an
amount described on the face hereof. "Payment Date" means the 25th day of each
month or, if any such date is not a Business Day, the next Business Day,
commencing in January 2004.

         Payments of interest on this Note due and payable on each Payment Date,
together with the installment of principal, if any, to the extent not in full
payment of this Note, shall be made by check mailed to the Person whose name
appears as the Registered Holder of this Note (or one or more Predecessor Notes)
on the Note Register as of the close of business on each Record Date, or, upon
written request made to the Indenture Trustee at least five Business Days prior
to the related Record Date by the Holder of a Note by wire transfer in
immediately available funds to an account specified in the request and at the
expense of such Noteholder, except that, unless Definitive Notes have been
issued pursuant to Section 2.11 of the Indenture, with respect to Notes
registered on the Record Date in the name of the nominee of the Clearing Agency
(initially, such nominee to be Cede & Co.), payment will be made by wire
transfer in immediately available funds to the account designated by such
nominee, except for the final installment of principal payable with respect to
this Note on the Maturity Date, Redemption Date or the Optional Notes Purchase
Date, which shall be payable as provided in the Indenture. Checks shall be
mailed to the Person entitled thereto at the address of such Person as it
appears on the Note Register as of the applicable Record Date without requiring
that this Note be submitted for notation of payment. Any reduction in the
principal amount of this Note (or any one or more Predecessor Notes) effected by
any payments made on any Payment Date shall be binding upon all future Holders
of this Note and of any Note issued upon the registration of transfer hereof or
in exchange hereof or in lieu hereof, whether or not noted hereon. If funds are
expected to be available, as provided in the Indenture, for payment in full of
the then remaining unpaid principal amount of this Note on a Payment Date, then
the Person who was the Registered Holder hereof as of the Record Date preceding
such Payment Date shall be notified by the Indenture Trustee, in the name of and
on behalf of the Issuer. Such notice shall be mailed or transmitted by facsimile
prior to such Payment Date, and the amount then due and payable shall be payable
only upon presentation and surrender of this Note at the office of the Indenture
Trustee's agent designated for such purpose.

                                     A-1-5
<PAGE>

         As provided in the Indenture and subject to certain limitations set
forth therein, the transfer of this Note may be registered on the Note Register
upon surrender of this Note for registration of transfer at the office or agency
designated by the Issuer pursuant to the Indenture, duly endorsed by, or
accompanied by a written instrument of transfer in form satisfactory to the
Indenture Trustee duly executed by, the Holder hereof or such Holder's attorney
duly authorized in writing, with such signature guaranteed by an "eligible
guarantor institution" meeting the requirements of the Note Registrar, which
requirements include membership or participation in the Securities Transfer
Agent's Medallion Program ("STAMP") or such other "signature guarantee program"
as may be determined by the Note Registrar in addition to, or in substitution
for, STAMP, all in accordance with the Securities Exchange Act of 1934, as
amended, and thereupon one or more new Notes of authorized denominations and in
the same aggregate principal amount will be issued to the designated transferee
or transferees. No service charge will be charged for any registration of
transfer or exchange of this Note, but the transferor may be required to pay a
sum sufficient to cover any tax or other governmental charge that may be imposed
in connection with any such registration of transfer or exchange.

         Each Noteholder and Note Owner, by acceptance of a Note or, in the case
of a Note Owner, a beneficial interest in a Note, covenants and agrees that no
recourse may be taken, directly or indirectly, with respect to the obligations
of the Issuer, the Owner Trustee, the Master Servicer or the Indenture Trustee
on the Notes or under the Indenture or any certificate or other writing
delivered in connection therewith, against (i) the Indenture Trustee, the Master
Servicer or the Owner Trustee in its individual capacity, (ii) any owner of a
beneficial interest in the Issuer or (iii) any partner, owner, shareholder,
member, beneficiary, agent, officer, director or employee of the Indenture
Trustee, the Master Servicer or the Owner Trustee in its individual capacity,
any holder of a beneficial interest in the Issuer, the Owner Trustee, the Master
Servicer or the Indenture Trustee or of any successor or assign of the Indenture
Trustee or the Owner Trustee in its individual capacity, except as any such
Person may have expressly agreed.

         Each Noteholder and Note Owner, by acceptance of a Note or, in the case
of a Note Owner, a beneficial interest in a Note, covenants and agrees by
accepting the benefits of the Indenture that such Noteholder or Note Owner will
not at any time institute against the Seller, the Depositor, the Master Servicer
or the Issuer, or join in any institution against the Seller, the Depositor or
the Issuer of, any bankruptcy, reorganization, arrangement, insolvency or
liquidation proceedings under any United States federal or state bankruptcy or
similar law in connection with any obligations relating to the Notes, the
Indenture or the other Operative Agreements.

         Each Noteholder and Note Owner, by acceptance of a Note or, in the case
of a Note Owner, a beneficial interest in a Note, consents to and agrees to be
bound by the terms and conditions of the Indenture.

         The Issuer has entered into the Indenture and this Note is issued with
the intention that, for federal, state and local income, single business and
franchise tax purposes, the Notes will qualify as indebtedness secured by the
Collateral. Each Noteholder, by acceptance of a Note (and each Note Owner by
acceptance of a beneficial interest in a Note), agrees to treat the Notes for
all federal, state and local income tax purposes as indebtedness (except that
any Note held by

                                     A-1-6
<PAGE>

a person that, for federal income tax purposes, owns or is treated as owning a
100% Percentage Interest of the Trust Certificate shall not be treated as
outstanding indebtedness).

         Prior to the due presentment for registration of transfer of this Note,
the Issuer, the Master Servicer, the Indenture Trustee and any agent of the
Issuer, the Master Servicer or the Indenture Trustee may treat the Person in
whose name this Note (as of the day of determination or as of such other date as
may be specified in the Indenture) is registered as the owner hereof for all
purposes, whether or not this Note be overdue, and none of the Issuer, the
Indenture Trustee or any such agent shall be affected by notice to the contrary.

         The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Issuer and the rights of the Holders of the Notes under the Indenture at any
time by the Issuer with the consent of holder of the Trust Certificate and the
consent of the Holders of Notes representing a majority of the Outstanding
Amount of all Notes at the time Outstanding. The Indenture also contains
provisions permitting the Holders of not less than 66-2/3% of the Outstanding
Amount of Notes, to waive compliance by the Issuer with certain provisions of
the Indenture and certain past defaults under the Indenture and their
consequences. Any such consent or waiver by the Holder of this Note (or any one
or more Predecessor Notes) shall be conclusive and binding upon such Holder and
upon all future Holders of this Note and of any Note issued upon the
registration of transfer hereof or in exchange hereof or in lieu hereof whether
or not notation of such consent or waiver is made upon this Note. The Indenture
also permits the amendment thereof, in certain limited circumstances, or the
waiver of certain terms and conditions set forth in the Indenture, without the
consent of Holders of the Notes issued thereunder but with the consent of the
Issuer which requires the consent of the holder of the Trust Certificate.

         The term "Issuer" as used in this Note includes any successor to the
Issuer under the Indenture.

         The Notes are issuable only in registered form in denominations as
provided in the Indenture, subject to certain limitations therein set forth.

         THIS NOTE AND THE INDENTURE SHALL BE GOVERNED BY AND, CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS
CONFLICT OF LAW PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE
PARTIES HEREUNDER AND THEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH
LAWS.

         No reference herein to the Indenture and no provision of this Note or
of the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal of and interest on this Note at
the times, place and rate, and in the coin or currency herein prescribed.

                                     A-1-7
<PAGE>

                                   ASSIGNMENT

         Social Security or taxpayer I.D. or other identifying number of
assignee:
          -----------------

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto:

--------------------------------------------------------------------------------
                         (name and address of assignee)

the within Note and all rights thereunder, and hereby irrevocably constitutes
and appoints ________________________, attorney, to transfer said Note on the
books kept for registration thereof, with full power of substitution in the
premises.

Dated:                           */
      ---------------------------

Signature Guaranteed:

                                 */
---------------------------------

*/ NOTICE: The signature to this assignment must correspond with the name of the
registered owner as it appears on the face of the within Note in every
particular, without alteration, enlargement or any change whatever. Such
signature must be guaranteed by an "eligible guarantor institution" meeting the
requirements of the Note Registrar, which requirements include membership or
participation in STAMP or such other "signature guarantee program" as may be
determined by the Note Registrar in addition to, or in substitution for, STAMP,
all in accordance with the Securities Exchange Act of 1934, as amended.

                                     A-1-8

<PAGE>

                                   EXHIBIT A-2

                              FORM OF CLASS M NOTE

         UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO ISSUER OR ITS AGENT
FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY NOTE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

         THIS NOTE DOES NOT EVIDENCE AN OBLIGATION OF OR AN INTEREST IN, AND IS
NOT GUARANTEED BY, THE DEPOSITOR, THE MASTER SERVICER, THE INDENTURE TRUSTEE,
THE OWNER TRUSTEE, OR ANY AFFILIATE OF ANY OF THEM AND IS NOT INSURED OR
GUARANTEED BY ANY GOVERNMENTAL AGENCY OR PRIVATE INSURER.

         THE PRINCIPAL OF THIS NOTE IS PAYABLE IN INSTALLMENTS AS SET FORTH
HEREIN. ACCORDINGLY, THE OUTSTANDING PRINCIPAL AMOUNT OF THIS NOTE AT ANY TIME
MAY BE LESS THAN THE AMOUNT SHOWN ON THE FACE HEREOF.

         THIS NOTE IS SUBORDINATE IN RIGHT OF PAYMENT OF INTEREST AS DESCRIBED
IN THE INDENTURE REFERRED TO HEREIN.

         (I) THIS NOTE MAY NOT BE ACQUIRED FOR, OR WITH THE ASSETS OF, AN
EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT ARRANGEMENT THAT IS SUBJECT TO SECTION
406 OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED
("ERISA"), OR TO SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED
(OR TO ANY SUBSTANTIALLY SIMILAR LAW ("SIMILAR LAW")), OR ANY ENTITY DEEMED TO
HOLD THE PLAN ASSETS OF THE FOREGOING (A "BENEFIT PLAN") OR (II) THE ACQUISITION
AND HOLDING OF SUCH NOTE FOR, OR WITH THE ASSETS OF, A BENEFIT PLAN WILL NOT
RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
SECTION 4975 OF THE CODE WHICH IS NOT COVERED UNDER PROHIBITED TRANSACTION CLASS
EXEMPTION ("PTCE") 84-14, PTCE 90-1, PTCE 91-38, PTCE 95-60, PTCE 96-23 OR SOME
OTHER APPLICABLE EXEMPTION, AND WILL NOT RESULT IN A NON-EXEMPT VIOLATION OF ANY
SIMILAR LAW.

                                      A-2-1
<PAGE>

                   THORNBURG MORTGAGE SECURITIES TRUST 2003-6,
                                  CLASS M NOTES

<TABLE>
<S>                                             <C>
Aggregate Original Principal Amount of the      Original Principal Amount of this Note:
Class M Notes: $ _________                      $___________

INTEREST RATE: Adjustable                       CUSIP: _____________

Number: ___
</TABLE>

         THORNBURG MORTGAGE SECURITIES 2003-6, a statutory trust organized and
existing under the laws of the State of Delaware (herein referred to as the
"Issuer"), for value received, hereby promises to pay to CEDE & CO., or
registered assigns, the principal sum of _______________________ DOLLARS AND
NO/100 ($_____________) payable on each Payment Date in an amount equal to the
result obtained by multiplying (A) a fraction the numerator of which is
$___________________ and the denominator of which is the aggregate original
principal amount of all Class M Notes issued on the Closing Date, by (B) the
aggregate amount, if any, payable from the Note Account in respect of principal
on the Class M Notes pursuant to Section 5.06 of the sale and servicing
agreement, dated as of December 1, 2003 (the "Sale and Servicing Agreement"),
among the Issuer, Thornburg Mortgage Home Loans, Inc., as Seller, Structured
Asset Securities Corporation, as Depositor, Wells Fargo Bank Minnesota, National
Association, as Master Servicer and Deutsche Bank National Trust Company, a
national banking association, as Indenture Trustee (the "Indenture Trustee");
provided, however, that the entire unpaid principal amount of this Note shall be
due and payable on the Payment Date occurring in December 2033 (the "Maturity
Date") or as otherwise specified in the Indenture dated as of December 1, 2003
(the "Indenture"), between the Issuer and Indenture Trustee. Capitalized terms
used but not defined herein are as defined in the Indenture and the Sale and
Servicing Agreement, which agreements also contain rules as to construction that
shall be applicable herein.

         The Issuer will pay interest on this Note at a per annum rate equal to
the Note Interest Rate, on the principal amount of this Note outstanding on the
immediately preceding Payment Date (after giving effect to all payments of
principal made on such preceding Payment Date) on each Payment Date until the
principal of this Note is paid or made available for payment in full.

         Interest on this Note will accrue for each Payment Date during the
period beginning on the immediately preceding Payment Date (or December 22,
2003, in the case of the first Accrual Period) and ending on the day immediately
preceding the related Payment Date (each, an "Accrual Period"). Interest will be
computed on the basis of a 360-day year consisting of twelve 30-day months. Such
principal of and interest on this Note shall be paid in the manner specified on
the reverse hereof.

         The principal of and interest on this Note are payable in such coin or
currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts. All payments made by the Issuer
with respect to this Note shall be applied first to interest due and payable on
this Note as provided above and then to the unpaid principal of this Note.

                                     A-2-2
<PAGE>

         Reference is made to the further provisions of this Note set forth on
the reverse hereof, which shall have the same effect as though fully set forth
on the face of this Note.

         Unless the certificate of authentication hereon has been executed by
the Indenture Trustee whose name appears below by manual signature, this Note
shall not be entitled to any benefit under the Indenture referred to on the
reverse hereof, or be valid or obligatory for any purpose.

                                     A-2-3
<PAGE>

         IN WITNESS WHEREOF, the Issuer has caused this instrument to be signed,
manually or in facsimile, by its Authorized Officer, as of the date set forth
below.

                                      THORNBURG MORTGAGE SECURITIES TRUST 2003-6

                                      By:  WILMINGTON TRUST COMPANY,
                                           not in its individual capacity but
                                           solely as Owner Trustee under the
                                           Trust Agreement

                                      By:
                                         ---------------------------------------
                                         Authorized Signatory

                                      Dated: December ___, 2003

                INDENTURE TRUSTEE'S CERTIFICATE OF AUTHENTICATION

         This is one of the Notes designated above and referred to in the
within-mentioned Indenture.

                                      DEUTSCHE BANK NATIONAL TRUST COMPANY,
                                          not in its individual capacity but
                                          solely as Indenture Trustee,

                                      By:
                                         ---------------------------------------
                                         Authorized Signatory

                                      Dated: December ___, 2003

                                     A-2-4
<PAGE>

                                    EXHIBIT B

                        FORM OF ERISA TRANSFER AFFIDAVIT

                                                             ------------------
                                                                     Date

STATE OF                    )
         --------------     ) ss.:
COUNTY OF                   )
         --------------

         Re:      Thornburg Mortgage Securities Trust 2003-6
                  Mortgage Backed Notes, Series 2003-6

         1. The undersigned is the ______________________ of (the "Investor"), a
[corporation] duly organized and existing under the laws of __________, on
behalf of which s/he makes this affidavit.

         2. The Investor (i) is not, and on [date of transfer] will not be,
acquiring a Note for, or with the assets of, an employee benefit plan or other
retirement arrangement that is subject to Section 406 of the Employee Retirement
Income Security Act of 1974, as amended ("ERISA"), or to Section 4975 of the
Internal Revenue Code of 1986, as amended (or to any substantially similar law
("Similar Law")), or any entity deemed to hold the plan assets of the foregoing
(a "Benefit Plan") or (ii) on [date of transfer], the acquisition and holding of
such Note for, or with the assets of, a Benefit Plan will not result in a
non-exempt prohibited transaction under Section 406 of ERISA or Section 4975 of
the Code which is not covered under Prohibited Transaction Class Exemption
("PTCE") 84-14, PTCE 90-1, PTCE 91-38, PTCE 95-60, PTCE 96-23 or some other
applicable exemption, and will not result in a non-exempt violation of any
Similar Law.

         3. The Investor hereby acknowledges that under the terms of the
Indenture dated as of December 1, 2003, between Thornburg Mortgage Securities
Trust 2003-6, as Issuer and Deutsche Bank National Trust Company, as Indenture
Trustee, no transfer of any Note shall be permitted to be made to any person
unless the Indenture Trustee has received a certificate from such transferee in
the form hereof.

                                      B-1
<PAGE>

                  IN WITNESS WHEREOF, the Investor has caused this instrument to
be executed on its behalf, pursuant to proper authority, by its duly authorized
officer, duly attested, this ____ day of _______________, 20__.

                                              [NAME OF INVESTOR]

                                               By:
                                                  ------------------------------
                                                  Name:
                                                  Title:

ATTEST:

-------------------------

STATE OF                 )
                         )  ss.:
COUNTY OF                )

                  Personally appeared before me the above-named _____________,
known or proved to me to be the same person who executed the foregoing
instrument and to be the _________________ of the Investor, and acknowledged
that s/he executed the same as her/his free act and deed and the free act and
deed of the Investor.

                  Subscribed and sworn before me this ___ day of _____________
20___.

                                             ----------------------------------
                                             NOTARY PUBLIC

                                             My commission expires the

                                             ___ day of __________, 20__.

                                      B-2

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