ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT

THIS ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT (this Assignment), dated as of August 1, 2003, is entered into by and among THORNBURG MORTGAGE SECURITIES TRUST 2003-4 (the Assignee), THORNBURG MORTGAGE HOME LOANS, INC., a Delaware corporation (the Assignor), BISHOPS GATE RESIDENTIAL MORTGAGE TRUST (formerly known as Cendant Residential Mortgage Trust, and together with, CENDANT MORTGAGE CORPORATION, the Sellers and individually, each a Seller), and CENDANT MORTGAGE CORPORATION, as servicer (the Servicer), and acknowledged by WELLS FARGO BANK MINNESOTA, NATIONAL ASSOCIATION, as master servicer, or any successor acting in the capacity of master servicer (the Master Servicer) and DEUTSCHE BANK NATIONAL TRUST COMPANY, as Indenture Trustee (the Indenture Trustee).

RECITALS

WHEREAS, the Assignor, the Sellers and the Servicer have entered into a certain Mortgage Loan Flow Purchase, Sale & Servicing Agreement, dated as of December 23, 2002 (the Purchase Agreement), pursuant to which the Assignor has acquired certain Mortgage Loans from the Sellers pursuant to the terms of the Purchase Agreement and Servicer has agreed to service such Mortgage Loans; and

WHEREAS, the Assignor has purchased under the Purchase Agreement certain Mortgage Loans secured by collateral in addition to the real property securing such Mortgage Loans (the Additional Collateral Mortgage Loans); and

WHEREAS, the Assignor, the Sellers and Servicer have entered into a certain Additional Collateral Assignment and Servicing Agreement, dated as of December 23, 2002 (the Additional Collateral Agreement), pursuant to which the Servicer has agreed to administer and monitor the Additional Collateral Servicers (as such term is defined in Section 1 of the Additional Collateral Agreement) obligations to administer and service the Additional Collateral Mortgage Loans; and

WHEREAS, the Assignee has agreed, on the terms and conditions contained herein, to purchase from the Assignor the Mortgage Loans and the Additional Collateral Mortgage Loans (collectively, the Specified Mortgage Loans) which are subject to the provisions of the Purchase Agreement and/or the Additional Collateral Agreement and are listed on the mortgage loan schedule attached as Schedule I hereto (the Specified Mortgage Loan Schedule);

WHEREAS, the Assignor desires that the Servicer continue to service the Specified Mortgage Loans, and the Servicer has agreed to do so, subject to the conditions set forth herein;

WHEREAS, the Master Servicer shall be obligated, among other things, to supervise the servicing of the Specified Mortgage Loans on behalf of the Indenture Trustee, and shall have the right, under certain circumstances, to terminate the rights and obligations of the Servicer upon the occurrence and continuance of an Event of Default, as provided in Section 10.01 of the Purchase Agreement, by the Servicer under this Assignment;

WHEREAS, the Assignor and the Servicer desire that the provisions of the Purchase Agreement and the Additional Collateral Agreement shall apply to the Specified Mortgage Loans, but only to the extent provided herein.

NOW, THEREFORE, in consideration of the mutual promises contained herein and other good and valuable consideration (the receipt and sufficiency of which are hereby acknowledged), the parties agree as follows:

1.

Assignment and Assumption.

a.

On and of the date hereof, the Assignor hereby sells, assigns and transfers to the Assignee all of its right, title and interest in the Specified Mortgage Loans and all rights related thereto as provided under the Purchase Agreement and the Additional Collateral Agreement to the extent relating to the Specified Mortgage Loans, the Assignee hereby accepts such assignment from the Assignor, and the Seller hereby acknowledges such assignment and assumption.

b.

On and as of the date hereof, the Assignor represents and warrants to the Assignee that the Assignor has not taken any action that would serve to impair or encumber the Assignees ownership interests in the Specified Mortgage Loans since the date of the Assignors acquisition of the Specified Mortgage Loans.

2.

Recognition of Assignee.  From and after the date hereof, both the Assignor and the Seller shall note the transfer of the Specified Mortgage Loans to the Assignee in their respective books and records and shall recognize the Assignee as the owner of the Specified Mortgage Loans, and the Servicer shall service the Specified Mortgage Loans for the benefit of the Assignee pursuant to the Purchase Agreement and Additional Collateral Agreement, the terms of which are incorporated herein by reference.  It is the intention of the Seller, the Servicer, the Assignee and the Assignor that this Assignment shall be binding upon and inure to the benefit of the Assignee and the Assignor and their successors and assigns.

3.

Representations and Warranties.

a.

The Assignee represents and warrants that it is a sophisticated investor able to evaluate the risks and merits of the transactions contemplated hereby, and that it has not relied in connection therewith upon any statements or representations of the Seller or the Assignor other than those contained in the Purchase Agreement, the Additional Collateral Agreement or this Assignment.

b.

Each of the parties hereto represents and warrants that it is duly and legally authorized to enter into this Assignment.

c.

Each of the parties hereto represents and warrants that this Assignment has been duly authorized, executed and delivered by it and (assuming due authorization, execution and delivery thereof by each of the other parties hereto) constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms, except as such enforcement may be limited by bankruptcy, insolvency, reorganization or other similar laws affecting the enforcement of creditors rights generally and by general equitable principles (regardless of whether such enforcement is considered in a proceeding in equity or at law).

4.

Continuing Effect.  Except as contemplated herein and in Exhibits A and B attached hereto, the Purchase Agreement and the Additional Collateral Agreement, respectively, shall remain in full force and effect in accordance with their terms.  The Servicer agrees, with respect to the Specified Mortgage Loans, to perform and observe the duties, responsibilities and obligations that are to be performed and observed under the provisions of the Purchase Agreement and the Additional Collateral Agreement, except as otherwise provided herein and on Exhibits A and B, respectively, and that the provisions of the Purchase Agreement and the Additional Collateral Agreement, as so modified, are and shall be a part of this Assignment to the same extent as if set forth herein in full.

5.

Master Servicing; Termination of Servicer.  The Servicer, including any successor servicer hereunder, shall be subject to the supervision of the Master Servicer, which Master Servicer shall be obligated to ensure that the Servicer services the Mortgage Loans in accordance with the provisions of this Assignment.  The Master Servicer, acting on behalf of the Assignee, the owner of the Mortgage Loans, shall have the same rights as the Purchaser under the Purchase Agreement to enforce the obligations of the Servicer under the Purchase Agreement and the term Purchaser as used in the Purchase Agreement in connection with any rights of the Purchaser shall refer to the Master Servicer, acting on behalf of the Assignee, except as otherwise specified in Exhibits A and B, hereto, and provided that any reference in the Purchase Agreement to the Purchasers expense (or words to like effect) shall be deemed to be expenses of the Assignee and, if it relates to reimbursement of expenses incurred by the Servicer shall be recoverable by the Servicer from the Collection Account.  The Master Servicer shall be entitled to terminate the rights and obligations of the Servicer under this Assignment upon an Event of Default, as provided in Section 10.01 of the Purchase Agreement.  Notwithstanding anything herein to the contrary, in no event shall the Master Servicer assume any of the obligations of the Purchaser under the Purchase Agreement or the Additional Collateral Agreement.  The Indenture Trustee, acting on behalf of the Assignee, the owner of the Mortgage Loans, shall have the same rights as the Purchaser under the Additional Collateral Agreement to enforce the obligations of the Servicer under the Additional Collateral Agreement and the term Purchaser as used in the Additional Collateral Agreement in connection with any rights of the Purchaser shall refer to the Indenture Trustee, acting on behalf of the Assignee.

ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT

           THIS ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT (this Assignment), dated as of March 1, 2003, is entered into by and among THORNBURG MORTGAGE SECURITIES TRUST 2003-2 (the Assignee), THORNBURG MORTGAGE HOME LOANS, INC., a Delaware corporation (the Assignor), BISHOPS GATE RESIDENTIAL MORTGAGE TRUST (formerly known as Cendant Residential Mortgage Trust, and together with, CENDANT MORTGAGE CORPORATION, the Sellers and individually, each a Seller), and CENDANT MORTGAGE CORPORATION, as servicer (the Servicer), and acknowledged by WELLS FARGO BANK MINNESOTA, NATIONAL ASSOCIATION, as master servicer, or any successor acting in the capacity of master servicer (the Master Servicer) and DEUTSCHE BANK NATIONAL TRUST COMPANY, as Trustee (the Trustee).

RECITALS

           WHEREAS, the Assignor, the Sellers and Servicer have entered into a certain Mortgage Loan Flow Purchase, Sale & Servicing Agreement, dated as of December 23, 2002 (the Purchase Agreement), pursuant to which the Assignor has acquired certain Mortgage Loans from the Sellers pursuant to the terms of the Purchase Agreement and Servicer has agreed to service such Mortgage Loans; and

           WHEREAS, the Assignor has purchased under the Purchase Agreement certain Mortgage Loans secured by collateral in addition to the real property securing such Mortgage Loans (the Additional Collateral Mortgage Loans); and

           WHEREAS, the Assignor, the Sellers and Servicer have entered into a certain Additional Collateral Assignment and Servicing Agreement, dated as of December 23, 2002 (the Additional Collateral Agreement), pursuant to which the Servicer has agreed to administer and monitor the Additional Collateral Servicers (as such term is defined in Section 1 of the Additional Collateral Agreement) obligations to administer and service the Additional Collateral Mortgage Loans; and

           WHEREAS, the Assignee has agreed, on the terms and conditions contained herein, to purchase from the Assignor the Mortgage Loans and the Additional Collateral Mortgage Loans (collectively, the Specified Mortgage Loans) which are subject to the provisions of the Purchase Agreement and/or the Additional Collateral Agreement and are listed on the mortgage loan schedule attached as Schedule I hereto (the Specified Mortgage Loan Schedule);

           WHEREAS, the Assignor desires that the Servicer continue to service the Specified Mortgage Loans, and the Servicer has agreed to do so, subject to the conditions set forth herein;

           WHEREAS, the Master Servicer shall be obligated, among other things, to supervise the servicing of the Specified Mortgage Loans on behalf of the Trustee, and shall have the right, under certain circumstances, to terminate the rights and obligations of the Servicer upon the occurrence and continuance of an Event of Default, as provided in Section 10.01 of the Purchase Agreement, by the Servicer under this Assignment;

           WHEREAS, the Assignor and the Servicer desire that the provisions of the Purchase Agreement and the Additional Collateral Agreement shall apply to the Specified Mortgage Loans, but only to the extent provided herein.

           NOW, THEREFORE, in consideration of the mutual promises contained herein and other good and valuable consideration (the receipt and sufficiency of which are hereby acknowledged), the parties agree as follows:

          1. Assignment and Assumption.

                      a. On and of the date hereof, the Assignor hereby sells, assigns and transfers to the Assignee all of its right, title and interest in the Specified Mortgage Loans and all rights related thereto as provided under the Purchase Agreement and the Additional Collateral Agreement to the extent relating to the Specified Mortgage Loans, the Assignee hereby accepts such assignment from the Assignor, and the Seller hereby acknowledges such assignment and assumption.

                      b. On and as of the date hereof, the Assignor represents and warrants to the Assignee that the Assignor has not taken any action that would serve to impair or encumber the Assignee's ownership interests in the Specified Mortgage Loans since the date of the Assignor's acquisition of the Specified Mortgage Loans.

           2. Recognition of Assignee. From and after the date hereof, both the Assignor and the Seller shall note the transfer of the Specified Mortgage Loans to the Assignee in their respective books and records and shall recognize the Assignee as the owner of the Specified Mortgage Loans, and Servicer shall service the Specified Mortgage Loans for the benefit of the Assignee pursuant to the Purchase Agreement and Additional Collateral Agreement, the terms of which are incorporated herein by reference. It is the intention of the Seller, the Servicer, the Assignee and the Assignor that this Assignment shall be binding upon and inure to the benefit of the Assignee and the Assignor and their successors and assigns.

           3. Representations and Warranties.

                      a. The Assignee represents and warrants that it is a sophisticated investor able to evaluate the risks and merits of the transactions contemplated hereby, and that it has not relied in connection therewith upon any statements or representations of the Seller or the Assignor other than those contained in the Purchase Agreement, the Additional Collateral Agreement or this Assignment.

                      b. Each of the parties hereto represents and warrants that it is duly and legally authorized to enter into this Assignment.

                      c. Each of the parties hereto represents and warrants that this Assignment has been duly authorized, executed and delivered by it and (assuming due authorization, execution and delivery thereof by each of the other parties hereto) constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms, except as such enforcement may be limited by bankruptcy, insolvency, reorganization or other similar laws affecting the enforcement of creditors' rights generally and by general equitable principles (regardless of whether such enforcement is considered in a proceeding in equity or at law).

           4. Continuing Effect. Except as contemplated herein and in Exhibits A and B attached hereto, the Purchase Agreement and the Additional Collateral Agreement, respectively, shall remain in full force and effect in accordance with their terms. The Servicer agrees, with respect to the Specified Mortgage Loans, to perform and observe the duties, responsibilities and obligations that are to be performed and observed under the provisions of the Purchase Agreement and the Additional Collateral Agreement, except as otherwise provided herein and on Exhibits A and B, respectively, and that the provisions of the Purchase Agreement and the Additional Collateral Agreement, as so modified, are and shall be a part of this Assignment to the same extent as if set forth herein in full.

           5. Master Servicing; Termination of Servicer. The Servicer, including any successor servicer hereunder, shall be subject to the supervision of the Master Servicer, which Master Servicer shall be obligated to ensure that the Servicer services the Mortgage Loans in accordance with the provisions of this Assignment. The Master Servicer, acting on behalf of the Assignee, the owner of the Mortgage Loans, shall have the same rights as the Purchaser under the Purchase Agreement to enforce the obligations of the Servicer under the Purchase Agreement and the term "Purchaser" as used in the Purchase Agreement in connection with any rights of the Purchaser shall refer to the Master Servicer, acting on behalf of the Assignee, except as otherwise specified in Exhibits A and B, hereto, and provided that any reference in the Purchase Agreement to "the Purchaser's expense" (or words to like effect) shall be deemed to be expenses of the Assignee and, if it relates to reimbursement of expenses incurred by the Servicer shall be recoverable by the Servicer from the Collection Account. The Master Servicer shall be entitled to terminate the rights and obligations of the Servicer under this Assignment upon an Event of Default, as provided in Section 10.01 of the Purchase Agreement. Notwithstanding anything herein to the contrary, in no event shall the Master Servicer assume any of the obligations of the Purchaser under the Purchase Agreement or the Additional Collateral Agreement. The Trustee, acting on behalf of the Assignee, the owner of the Mortgage Loans, shall have the same rights as the Purchaser under the Additional Collateral Agreement to enforce the obligations of the Servicer under the Additional Collateral Agreement and the term "Purchaser" as used in the Additional Collateral Agreement in connection with any rights of the Purchaser shall refer to the Trustee, acting on behalf of the Assignee.

           6. Representations. The Servicer shall not be obligated or required to make any further representations and warranties regarding the characteristics of the Specified Mortgage Loans. Notwithstanding anything to the contrary, the representations set forth in Section 3.03 of the Purchase Agreement and Section 2 of the Additional Collateral Agreement shall remain in full force and effect as of the date of the Purchase Agreement and the Additional Collateral Agreement, respectively. Further, the representations made in Section 3.01 of the Purchase Agreement shall be deemed to be made as of the date of this Assignment.

ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT

           THIS ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT (this �Assignment�), dated as of March 1, 2003, is entered into by and among THORNBURG MORTGAGE SECURITIES TRUST 2003-2 (the �Assignee�), THORNBURG MORTGAGE HOME LOANS, INC., a Delaware corporation (the �Assignor�), BISHOP�S GATE RESIDENTIAL MORTGAGE TRUST (formerly known as Cendant Residential Mortgage Trust, and together with, CENDANT MORTGAGE CORPORATION, the �Sellers� and individually, each a �Seller�), and CENDANT MORTGAGE  . . .

THIS MORTGAGE LOAN PURCHASE AGREEMENT, dated as of August 1, 2003 (the Agreement), is made and entered into between Thornburg Mortgage Home Loans, Inc. (the Seller) and Greenwich Capital Acceptance, Inc. (the Purchaser).

W I T N E S S E T H

WHEREAS, the Seller is the owner of the notes or other evidence of indebtedness (the Mortgage Notes) so indicated on Schedule I hereto referred to below, and the other documents or instruments constituting the Mortgage File (collectively, the Mortgage Loans); and

WHEREAS, the Seller is a party to the servicing agreements identified on Schedule II (each a Servicing Agreement, and together the Servicing Agreements), and certain of the Mortgage Loans are currently being serviced thereunder by the servicers identified therein; and

WHEREAS, the Seller, as of the date hereof, owns the mortgages or deeds of trust (the Mortgages) on the properties (the Mortgaged Properties) securing such Mortgage Loans, including rights to (a) any property acquired by foreclosure or deed in lieu of foreclosure or otherwise and (b) the proceeds of any insurance policies covering the Mortgage Loans or the Mortgaged Properties or the obligors on the Mortgage Loans; and

WHEREAS, the parties hereto desire that the Seller sell the Mortgage Loans, including the Mortgages, and assign the Sellers rights under the Servicing Agreements to the Purchaser pursuant to the terms of this Agreement;

WHEREAS, pursuant to the terms of that certain Sale and Servicing Agreement dated as of August 1, 2003 (the Sale and Servicing Agreement) among Thornburg Mortgage Securities Trust 2003-4, as issuer (the Trust), the Purchaser, as depositor, the Seller, as seller, Wells Fargo Bank Minnesota, National Association, as master servicer and Deutsche Bank National Trust Company, as indenture trustee (in such capacity, the Indenture Trustee), the Purchaser will convey the Mortgage Loans to the Trust; and

WHEREAS, pursuant to the terms of that certain Indenture dated August 1, 2003 (the Indenture), between the Indenture Trustee and the Trust, the Trust will pledge the Mortgage Loans to the Indenture Trustee and issue the Thornburg Mortgage Securities Trust 2003-4 Mortgage-Backed Notes, Series 2003-4.

NOW, THEREFORE, in consideration of the mutual covenants herein contained, the parties hereto agree as follows:

ARTICLE I.

DEFINITIONS AND SCHEDULES

Section 1.01.

Definitions.  Any capitalized term used but not defined herein and below shall have the meaning assigned thereto in the Sale and Servicing Agreement, the Indenture and the related Prospectus Supplement dated August 25, 2003 (the Prospectus Supplement) to the Prospectus dated June 23, 2003 (the Prospectus).

ARTICLE II.

SALE OF MORTGAGE LOANS; PAYMENT OF PURCHASE PRICE

Section 2.01.

Sale of Mortgage Loans; Assignment of the Servicing Agreements.  The Seller, concurrently with the execution and delivery of this Agreement, does hereby sell, assign, set over, and otherwise convey to the Purchaser, without recourse, all of its right, title and interest in, to and under (i) each Mortgage Loan, including the related Cut-Off Date Principal Balance, all interest due thereon after the Cut-Off Date and all collections in respect of interest and principal due after the Cut-Off Date (and all principal received before the Cut-Off Date to the extent such principal relates to a Monthly Payment due after the Cut-Off Date); (ii) property which secured such Mortgage Loan and which has been acquired by foreclosure or deed in lieu of foreclosure; (iii) its interest in any insurance policies in respect of the Mortgage Loans; (iv) any Additional Collateral with respect to the Mortgage Loans; (v) each Guaranty Surety Bond with respect to the Additional Collateral Mortgage Loans conveyed to the Seller from MSDWCC and Cendant; and (vi) all proceeds of any of the foregoing.

Concurrently with the execution and delivery of this Agreement, the Seller hereby assigns to the Purchaser all of its rights and interest (but none of its obligations) under each Servicing Agreement, other than any servicing rights retained pursuant to the provisions of such Servicing Agreements, to the extent relating to the Mortgage Loans.  The Purchaser hereby accepts such assignment, and shall be entitled to exercise all such rights of the Seller under each Servicing Agreement as if the Purchaser had been a party to each such agreement.

Section 2.02.

Obligations of the Seller Upon Sale and Assignment. In connection with the transfer pursuant to Section 2.01 hereof, the Seller further agrees, at its own expense, on or prior to the Closing Date, (a) to indicate in its books and records that the Mortgage Loans have been sold to the Purchaser pursuant to this Agreement and (b) to deliver to the Purchaser and the Indenture Trustee a computer file containing a true and complete list of all such Mortgage Loans specifying for each such Mortgage Loan, as of the Cut-Off Date, (i) its account number and (ii) the Cut-Off Date Principal Balance and such file, which forms a part of Schedule A to the Sale and Servicing Agreement, shall also be marked as Schedule I to this Agreement and is hereby incorporated into and made a part of this Agreement.

In connection with such conveyance by the Seller, the Seller shall on behalf of the Purchaser deliver to, and deposit with the Indenture Trustee, as assignee of the Purchaser, on or before the Closing Date, the documents described in Section 2.01 of the Sale and Servicing Agreement as being or to be delivered to the Indenture Trustee, including, but not limited to, the Servicing Agreements.

The Seller hereby confirms to the Purchaser and the Trustee that it has made the appropriate entries in its general accounting records, to indicate that the Mortgage Loans have been transferred to the Indenture Trustee, or a custodian appointed pursuant to the Sale and Servicing Agreement to act on behalf of the Indenture Trustee, and that the Mortgage Loans constitute part of the Trust in accordance with the terms of the Sale and Servicing Agreement.

The Purchaser hereby acknowledges its acceptance of all right, title and interest in, to and under the Mortgage Loans and other property, and its rights under the Servicing Agreements, now existing or hereafter created, conveyed to it pursuant to Section 2.01 hereof.

MORTGAGE LOAN PURCHASE AGREEMENT



between



THORNBURG MORTGAGE HOME LOANS, INC.

as Mortgage Loan Seller



and



STRUCTURED ASSET MORTGAGE INVESTMENTS INC.

as Purchaser



Dated as of

March 1, 2003

MORTGAGE LOAN PURCHASE AGREEMENT

Dated as of January 1, 2003

Adjustable-Rate Mortgage Loans

Thornburg Mortgage Securities Trust 2003-1

Table of Contents

Schedule I:

Mortgage Loan Schedule

I-1

Schedule II:

List of Servicers and Servicing Agreements

II-1

Schedule III:

Sellers Representations and Warranties Relating to Mortgage Loans

III-1

THIS MORTGAGE LOAN PURCHASE AGREEMENT, dated as of January 1, 2003 (the Agreement), is made and entered into between Thornburg Mortgage Home Loans, Inc. (the Seller) and Greenwich Capital Acceptance, Inc. (the Purchaser).

W I T N E S S E T H

WHEREAS, the Seller is the owner of the notes or other evidence of indebtedness (the Mortgage Notes) so indicated on Schedule I hereto referred to below, and the other documents or instruments constituting the Mortgage File (collectively, the Mortgage Loans); and

WHEREAS, the Seller is a party to the servicing agreements identified on Schedule II (each a Servicing Agreement, and together the Servicing Agreements), and certain of the Mortgage Loans are currently being serviced thereunder by the servicers identified therein; and

WHEREAS, the Seller, as of the date hereof, owns the mortgages or deeds of trust (the Mortgages) on the properties (the Mortgaged Properties) securing such Mortgage Loans, including rights to (a) any property acquired by foreclosure or deed in lieu of foreclosure or otherwise and (b) the proceeds of any insurance policies covering the Mortgage Loans or the Mortgaged Properties or the obligors on the Mortgage Loans; and

WHEREAS, the parties hereto desire that the Seller sell the Mortgage Loans, including the Mortgages, and assign the Sellers rights under the Servicing Agreements to the Purchaser pursuant to the terms of this Agreement; and

WHEREAS, pursuant to the terms of that certain Pooling and Servicing Agreement dated as of January 1, 2003 (the Pooling and Servicing Agreement) among the Purchaser, as depositor, the Seller, as seller, Wells Fargo Bank Minnesota, National Association, as master servicer and securities administrator, Deutsche Bank Trust Company Delaware, as Delaware trustee and Deutsche Bank National Trust Company, as trustee (in such capacity, the Trustee), the Purchaser will convey the Mortgage Loans to Thornburg Mortgage Securities Trust 2003-1 (the Trust).

NOW, THEREFORE, in consideration of the mutual covenants herein contained, the parties hereto agree as follows:

ARTICLE I.

  DEFINITIONS AND SCHEDULES

Section 1.01.  Definitions.

Any capitalized term used but not defined herein and below shall have the meaning assigned thereto in the Pooling and Servicing Agreement, the related Prospectus Supplement dated January 27, 2003 (the Prospectus Supplement) to the Prospectus dated October 10, 2002 (the Prospectus) or the related Private Placement Memorandum dated January 27, 2003 (the Memorandum).

ARTICLE II.

  SALE OF MORTGAGE LOANS; PAYMENT OF PURCHASE PRICE

Section 2.01.  Sale of Mortgage Loans; Assignment of the Servicing Agreements.

The Seller, concurrently with the execution and delivery of this Agreement, does hereby sell, assign, set over, and otherwise convey to the Purchaser, without recourse, all of its right, title and interest in, to and under (i) each Mortgage Loan, including the related Cut-Off Date Principal Balance, all interest due thereon after the Cut-Off Date and all collections in respect of interest and principal due after the Cut-Off Date (and all principal received before the Cut-Off Date to the extent such principal relates to a Monthly Payment due after the Cut-Off Date); (ii) property which secured such Mortgage Loan and which has been acquired by foreclosure or deed in lieu of foreclosure; (iii) its interest in any insurance policies in respect of the Mortgage Loans; (iv) any Additional Collateral with respect to the Mortgage Loans; and (v) all proceeds of any of the foregoing.

Concurrently with the execution and delivery of this Agreement, the Seller hereby assigns to the Purchaser all of its rights and interest (but none of its obligations) under each Servicing Agreement, other than any servicing rights retained pursuant to the provisions of such Servicing Agreements, to the extent relating to the Mortgage Loans.  The Purchaser hereby accepts such assignment, and shall be entitled to exercise all such rights of the Seller under each Servicing Agreement as if the Purchaser had been a party to each such agreement.

Section 2.02.  Obligations of the Seller Upon Sale and Assignment.  

In connection with the transfer pursuant to Section 2.01 hereof, the Seller further agrees, at its own expense, on or prior to the Closing Date, (a) to indicate in its books and records that the Mortgage Loans have been sold to the Purchaser pursuant to this Agreement and (b) to deliver to the Purchaser and the Trustee a computer file containing a true and complete list of all such Mortgage Loans specifying for each such Mortgage Loan, as of the Cut-Off Date, (i) its account number and (ii) the Cut-Off Date Principal Balance and such file, which forms a part of Schedule A to the Pooling and Servicing Agreement, shall also be marked as Schedule I to this Agreement and is hereby incorporated into and made a part of this Agreement.

MORTGAGE LOAN PURCHASE AGREEMENT

           MORTGAGE LOAN PURCHASE AGREEMENT, dated as of November 1, 2002 (this Agreement), by and between THORNBURG MORTGAGE HOME LOANS, INC., a Delaware corporation (the Mortgage Loan Seller), and STRUCTURED ASSET MORTGAGE INVESTMENTS INC., a Delaware corporation (the Purchaser).

           Upon the terms and subject to the conditions of this Agreement, the Mortgage Loan Seller agrees to sell, and the Purchaser agrees to purchase, certain hybrid and adjustable rate, first lien mortgage loans secured by one- to four-family residential properties (collectively, the Mortgage Loans) as described herein and as listed on Schedule B hereto (the Mortgage Loan Schedule). The Purchaser intends to sell the Mortgage Loans to Thornburg Mortgage Securities Trust 2002-4, a Delaware statutory trust (the Trust) created pursuant to a trust, pooling and servicing agreement, to be dated as of November 1, 2002 (the Trust, Pooling and Servicing Agreement), between the Purchaser, as seller, Wells Fargo Bank Minnesota, National Association, as master servicer and securities administrator, Deutsche Bank National Trust Company, as trustee (the Trustee), Deutsche Bank Trust Company Delaware, as Delaware trustee, and Thornburg Mortgage Home Loans, Inc. (Thornburg). Pursuant to the Trust, Pooling and Servicing Agreement, the Trust will issue its Mortgage Pass-Through Certificates, Series 2002-4 (the Certificates).

           The Purchaser has filed with the Securities and Exchange Commission (the Commission) a registration statement on Form S-3 (Number 333-68542) relating to its Mortgage Pass-Through Certificates and the offering of certain series thereof (including certain classes of the Certificates) from time to time in accordance with Rule 415 under the Securities Act of 1933, as amended, and the rules and regulations of the Commission promulgated thereunder (the Securities Act). Such registration statement, when it became effective under the Securities Act, and the prospectus relating to the public offering of certain classes of the Certificates by the Purchaser (the Public Offering), as from time to time each is amended or supplemented pursuant to the Securities Act or otherwise, are referred to herein as the Registration Statement and the Prospectus, respectively. The Prospectus Supplement shall mean that supplement, dated November 25, 2002 to the Prospectus, dated November 25, 2002 relating to certain classes of the Certificates. With respect to the Public Offering of certain classes of the Certificates, the Purchaser and Bear, Stearns & Co. Inc. (Bear Stearns) have entered into a terms agreement dated as of November 25, 2002 to an underwriting agreement dated June 25, 1996, between the Purchaser and Bear Stearns (collectively, the Underwriting Agreement) and with respect to the private placement of certain classes of Certificates (the Private Offering), the Purchaser and Bear Stearns have entered into a purchase agreement dated April 23, 1993, and a related terms agreement dated as of November 25, 2002 (collectively, the Purchase Agreement). In addition, the Purchaser has prepared a Confidential Private Placement Memorandum, dated November 25, 2002 (the PPM), containing information concerning the classes of Certificates related to the Private Offering.

           Now, therefore, in consideration of the premises and the mutual agreements set forth herein, the parties hereto agree as follows:

          SECTION 1.  Definitions. Certain terms are defined herein. Capitalized terms used herein but not defined herein shall have the meanings specified in the Trust, Pooling and Servicing Agreement. The following other terms are defined as follows:

           Acquisition Price: Cash in an amount equal to $870,860,295.64 (plus $2,657,160.05 in accrued interest).

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

           Appraised Value: For any Mortgaged Property related to a Mortgage Loan, the amount, if any, set forth as the appraised value of such Mortgaged Property in any appraisal made for the mortgage originator in connection with its origination of the related Mortgage Loan.

           Bear Stearns: Bear, Stearns & Co. Inc.

           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 Interest Rate converted from an adjustable rate to a fixed rate or any other rate offered at the time by the related originator.

           Closing Date: November 26, 2002.

           Code: The Internal Revenue Code of 1986, as amended.

          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.

MORTGAGE LOAN PURCHASE AGREEMENT



between



THORNBURG MORTGAGE HOME LOANS, INC.

as Mortgage Loan Seller



and



STRUCTURED ASSET MORTGAGE INVESTMENTS INC.

as Purchaser



Dated as of

March 1, 2003

TABLE OF CONTENTS

Exhibit 99.1

MORTGAGE LOAN PURCHASE AGREEMENT


between


THORNBURG MORTGAGE HOME LOANS, INC.

as Mortgage Loan Seller


and


STRUCTURED ASSET MORTGAGE INVESTMENTS INC.

as Purchaser


Dated as of

November 1, 2002

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EXHIBIT 99.1

MORTGAGE LOAN PURCHASE AGREEMENT



between



THORNBURG MORTGAGE HOME LOANS, INC.

as Mortgage Loan Seller



and



STRUCTURED ASSET MORTGAGE INVESTMENTS INC.

as Purchaser



Dated as of

May 1, 2002

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MORTGAGE LOAN PURCHASE AGREEMENT

between

THORNBURG MORTGAGE HOME LOANS, INC.

as Seller

and

STRUCTURED ASSET MORTGAGE INVESTMENTS II INC.

as Purchaser

Dated as of

December 1, 2005

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                        MORTGAGE LOAN PURCHASE AGREEMENT



                                     between



                       THORNBURG MORTGAGE HOME LOANS, INC.

                                    as Seller



                                       and



                  STRUCTURED ASSET MORTGAGE INVESTMENTS II INC.

                                  as Purchaser



                                   Dated as of

                                  March 1, 2004




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SECTION 1.   DEFINITIONS.......... . . .

EXECUTION

GREENWICH CAPITAL ACCEPTANCE, INC.,

as Purchaser

and

THORNBURG MORTGAGE HOME LOANS, INC.,

as Seller

MORTGAGE LOAN PURCHASE AGREEMENT

Dated as of August 1, 2002

Adjustable-Rate Mortgage Loans

Thornburg Mortgage Securities Trust 2002-3

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