Document:

AMENDMENT
      NUMBER 2 TO 

    TRUST
      AGREEMENT

    

    This
      is
      Amendment Number 2, dated as of August 1, 2006 (this “Amendment”), to the Trust
      Agreement, dated as of November 1, 2005, as amended (the “Agreement”), by and
      among STRUCTURED ASSET SECURITIES CORPORATION., a Delaware corporation, as
      depositor (the “Depositor”), AURORA LOAN SERVICES LLC, as master servicer (the
“Master Servicer”), and U.S. BANK NATIONAL ASSOCIATION., a national banking
      association, as trustee (the “Trustee”), relating to the Lehman XS Trust
      Mortgage Pass-Through Certificates, Series 2005-7N.

    

    WHEREAS,
      Section 11.03 of the Agreement provides that under the circumstances and subject
      to the conditions set forth therein, the Agreement may be amended from time
      to
      time; and

     

    WHEREAS,
      in accordance therewith, by the execution and delivery of this Amendment, the
      parties hereby amend the Agreement to the extent and on the terms set forth
      in
      this Amendment.

     

    NOW,
      THEREFORE, in consideration of the mutual agreements herein contained, each
      party hereto agrees as follows for the benefit of the other parties and for
      the
      benefit of the Certificateholders:

     

    ARTICLE
      I

     

    Definitions

     

    SECTION
      1.01. Cross
      Reference to Definitions in Agreement.
      Capitalized terms used in this Amendment and not defined herein or amended
      by
      the terms of this Amendment shall have the meaning assigned to such terms in
      the
      Agreement.

    

    ARTICLE
      II

     

    Effectiveness

    

    SECTION
      2.01. Section 11.03 of the Agreement provides that the Agreement may be amended
      from time to time by the Depositor, the Master Servicer and the Trustee, but
      without the consent of the Swap Counterparty (except to the extent that the
      rights or obligations of (1) the Swap Counterparty thereunder or (2) the Swap
      Counterparty under the Swap Agreement (or the ability of the Trustee on behalf
      of the Supplemental Interest Trust to perform fully and timely its obligations
      under the Swap Agreement), are affected thereby, in which case prior written
      consent of the Swap Counterparty is required) and without notice to or the
      consent of any of the Holders affected thereby for the purpose of curing any
      ambiguity in the Agreement; provided, however, that no such amendment shall
      be
      made unless the Trustee and the Swap
      Counterparty
      receive
      an Opinion of Counsel addressed to the Trustee and the Swap Counterparty, at
      the
      expense of the party requesting the change, that such change will not cause
      an
      Adverse REMIC Event; and provided further, that such amendment is permitted
      under the Agreement. For purposes of this paragraph, references to “Holder” or
“Holders” shall be deemed to include, in the case of any Class of Book-Entry
      Certificates, the related Certificate Owners.

    

    SECTION
      2.02. By their execution of this Amendment, the Depositor, the Master Servicer
      and the Trustee evidence their desire to make the amendments to the Agreement
      set forth below.

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    

    ARTICLE
      III

    

    Amendments
      to the Agreement 

    

    SECTION
      3.01. Amendments.

    

    The
      definition of “One-Year
      MTA”
is
      hereby deleted and replaced in its entirety with the following:

    

    “One-Year
      MTA:
      The
      index applicable to the Mortgage Rates for the Mortgage Loans and to the Class
      2-A1 Certificates and is equal to (i) with respect to the first Accrual Period,
      One-Year MTA shall equal the Initial One-Month MTA Rate and (ii) with respect
      to
      each subsequent Accrual Period, a per annum rate equal to the twelve-month
      moving average monthly yield on United States Treasury Securities adjusted
      to a
      constant maturity of one year, as published by the Federal Reserve Board in
      the
      Federal Reserve Statistical Release 'Selected Interest Rates (H.15)', determined
      by averaging the monthly yields for the most recently available twelve months.
      The One-Year MTA figure used for each interest rate adjustment date will be
      the
      One-Year MTA figure published by Bloomberg during the first week of the related
      Accrual Period. In the event that One-Year MTA becomes unavailable or is
      otherwise unpublished, the Master Servicer will select a comparable alternative
      index in accordance with the method described in the Swap
      Agreement.”

    

    ARTICLE
      IV

     

    Miscellaneous

    

    SECTION
      4.01. Counterparts.
      This
      Amendment may be executed in two or more counterparts (and by different parties
      on separate counterparts), each of which shall be an original, but all of which
      together shall constitute one and the same instrument.

    

    SECTION
      4.02. Headings.
      The
      headings herein are for purposes of reference only and shall not otherwise
      affect the meaning or interpretation or any provision hereof.

    

    SECTION
      4.03. Agreement
      in Full Force and Effect as Amended.
      Except
      as specifically amended or waived hereby, all of the terms and conditions of
      the
      Agreement shall remain in full force and effect. All references to the Agreement
      in any other document or instrument shall be deemed to mean such Agreement
      as
      amended by this Amendment. This Amendment shall not constitute a novation of
      the
      Agreement, but shall constitute an amendment thereof. The parties hereto agree
      to be bound by the terms and obligations of the Agreement, as amended by this
      Amendment, as though the terms and obligations of the Agreement were set forth
      herein.

    

    SECTION
      4.04 Conditions
      to Effectiveness.
      This
      Amendment shall become effective upon the receipt by the Trustee of the opinion
      of counsel referred to in Section 11.03 of the Agreement.

    

    SECTION
      4.05. Governing
      Law.
      THIS
      AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
      THE
      STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
      PROVISIONS.

    

    

    

    [SIGNATURE
      PAGE IMMEDIATELY FOLLOWS]

    
      
         

      

      
         

        
          

        

      

      
         

      

    

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

     

    
      	 	 	 
	 	
              STRUCTURED
                ASSET
                SECURITIES CORPORATION, 
as Depositor

            
	 
 	 
 	 
 
	 	By:  	 
	 	
              

              Name:
                

              Title:
                

            
	 	 

    

       

      
        	 	 	 
	 	
                U.S.
                  BANK NATIONAL ASSOCIATION, 

                not
                  in its individual capacity, but solely 

                as
                  Trustee

              
	 
 	 
 	 
 
	 	By:  	 
	 	
                

                Name:
                  

                Title:
                  

              
	 	 

         

        
          	 	 	 
	 	
                  AURORA
                    LOAN SERVICES LLC, 

                  as
                    Master Servicer

                
	 
 	 
 	 
 
	 	By:  	 
	 	
                  

                  Name:
                    

                  Title:Unassociated Document

    AMENDMENT
      NUMBER 1 TO 

    TRUST
      AGREEMENT

    

    This
      is
      Amendment Number 1, dated as of August 1, 2006 (this “Amendment”), to the Trust
      Agreement, dated as of December 1, 2005, (the “Agreement”), by and among
      STRUCTURED ASSET SECURITIES CORPORATION., a Delaware corporation, as depositor
      (the “Depositor”), AURORA LOAN SERVICES LLC, as master servicer (the “Master
      Servicer”), and U.S. BANK NATIONAL ASSOCIATION., a national banking association,
      as trustee (the “Trustee”), relating to the Lehman XS Trust Mortgage
      Pass-Through Certificates, Series 2005-9N.

    

    WHEREAS,
      Section 11.03 of the Agreement provides that under the circumstances and subject
      to the conditions set forth therein, the Agreement may be amended from time
      to
      time; and

     

    WHEREAS,
      in accordance therewith, by the execution and delivery of this Amendment, the
      parties hereby amend the Agreement to the extent and on the terms set forth
      in
      this Amendment.

     

    NOW,
      THEREFORE, in consideration of the mutual agreements herein contained, each
      party hereto agrees as follows for the benefit of the other parties and for
      the
      benefit of the Certificateholders:

     

    ARTICLE
      I

     

    Definitions

     

    SECTION
      1.01. Cross
      Reference to Definitions in Agreement.
      Capitalized terms used in this Amendment and not defined herein or amended
      by
      the terms of this Amendment shall have the meaning assigned to such terms in
      the
      Agreement.

    

    ARTICLE
      II

     

    Effectiveness

    

    SECTION
      2.01. Section 11.03 of the Agreement provides that the Agreement may be amended
      from time to time by the Depositor, the Master Servicer and the Trustee, but
      without the consent of the Swap Counterparty (except to the extent that the
      rights or obligations of (1) the Swap Counterparty thereunder or (2) the Swap
      Counterparty under the Swap Agreement (or the ability of the Trustee on behalf
      of the Supplemental Interest Trust to perform fully and timely its obligations
      under the Swap Agreement), are affected thereby, in which case prior written
      consent of the Swap Counterparty is required) and without notice to or the
      consent of any of the Holders affected thereby for the purpose of curing any
      ambiguity in the Agreement; provided, however, that no such amendment shall
      be
      made unless the Trustee and the Swap
      Counterparty
      receive
      an Opinion of Counsel addressed to the Trustee and the Swap Counterparty, at
      the
      expense of the party requesting the change, that such change will not cause
      an
      Adverse REMIC Event; and provided further, that such amendment is permitted
      under the Agreement. For purposes of this paragraph, references to “Holder” or
“Holders” shall be deemed to include, in the case of any Class of Book-Entry
      Certificates, the related Certificate Owners.

    

    SECTION
      2.02. By their execution of this Amendment, the Depositor, the Master Servicer
      and the Trustee evidence their desire to make the amendments to the Agreement
      set forth below.

    

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    ARTICLE
      III

    

    Amendments
      to the Agreement 

    

    SECTION
      3.01. Amendments.

    

    The
      definition of “One-Year
      MTA”
is
      hereby deleted and replaced in its entirety with the following:

    

    “One-Year
      MTA:
      The
      index applicable to the Mortgage Rates for the Mortgage Loans and to the Class
      2-A1 Certificates and is equal to (i) with respect to the first Accrual Period,
      One-Year MTA shall equal the Initial One-Month MTA Rate and (ii) with respect
      to
      each subsequent Accrual Period, a per annum rate equal to the twelve-month
      moving average monthly yield on United States Treasury Securities adjusted
      to a
      constant maturity of one year, as published by the Federal Reserve Board in
      the
      Federal Reserve Statistical Release 'Selected Interest Rates (H.15)', determined
      by averaging the monthly yields for the most recently available twelve months.
      The One-Year MTA figure used for each interest rate adjustment date will be
      the
      One-Year MTA figure published by Bloomberg during the first week of the related
      Accrual Period. In the event that One-Year MTA becomes unavailable or is
      otherwise unpublished, the Master Servicer will select a comparable alternative
      index in accordance with the method described in the Swap
      Agreement.”

    

    ARTICLE
      IV

     

    Miscellaneous

    

    SECTION
      4.01. Counterparts.
      This
      Amendment may be executed in two or more counterparts (and by different parties
      on separate counterparts), each of which shall be an original, but all of which
      together shall constitute one and the same instrument.

    

    SECTION
      4.02. Headings.
      The
      headings herein are for purposes of reference only and shall not otherwise
      affect the meaning or interpretation or any provision hereof.

    

    SECTION
      4.03. Agreement
      in Full Force and Effect as Amended.
      Except
      as specifically amended or waived hereby, all of the terms and conditions of
      the
      Agreement shall remain in full force and effect. All references to the Agreement
      in any other document or instrument shall be deemed to mean such Agreement
      as
      amended by this Amendment. This Amendment shall not constitute a novation of
      the
      Agreement, but shall constitute an amendment thereof. The parties hereto agree
      to be bound by the terms and obligations of the Agreement, as amended by this
      Amendment, as though the terms and obligations of the Agreement were set forth
      herein.

    

    SECTION
      4.04 Conditions
      to Effectiveness.
      This
      Amendment shall become effective upon the receipt by the Trustee of the opinion
      of counsel referred to in Section 11.03 of the Agreement.

    

    SECTION
      4.05. Governing
      Law.
      THIS
      AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
      THE
      STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICTS OF LAW
      PROVISIONS.

    

    

    

    [SIGNATURE
      PAGE IMMEDIATELY FOLLOWS]

     

    
      
         

      

      
        2

        
          

        

      

      
         

      

    

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

     

    

     

    STRUCTURED
      ASSET SECURITIES CORPORATION, 

    as
      Depositor

    

    By:
      _________________________________ 

    Name:
      

    Title:
      

    

    U.S.
      BANK
      NATIONAL ASSOCIATION, 

    not
      in
      its individual capacity, but solely 

    as
      Trustee

    

    By:
      _________________________________

    Name:
      

    Title:
      

    

    AURORA
      LOAN SERVICES LLC, 

    as
      Master
      Servicer

    

    By:
      _________________________________

    Name:
      

    Title:

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