Document:

EXECUTION

    

    
 

    THIS
      TRUST AGREEMENT (this “Trust
      Agreement”)
      dated
      as of August 1, 2006, is executed by and among GS MORTGAGE SECURITIES CORP.,
      as
      depositor (the “Depositor”),
      U.S.
      BANK NATIONAL ASSOCIATION, solely in its capacity as trustee pursuant to the
      Underlying Trust Agreement (as defined below) (the “Trustee”)
      and
      WELLS FARGO BANK, N.A., as master servicer (in such capacity, the “Master
      Servicer”)
      and
      securities administrator (in such capacity, the “Securities
      Administrator”).

     

    WITNESSETH

    

    WHEREAS,
      the Trustee, the Master Servicer and the Securities Administrator have entered
      into the Master Servicing and Trust Agreement (the “Underlying
      Trust Agreement”)
      dated
      as of August 1, 2006 together with GS Mortgage Securities Corp., as depositor,
      and the custodians named therein, creating and establishing GSR Mortgage Loan
      Trust 2006-8F (the “Underlying
      Trust”);

     

    WHEREAS,
      the Underlying Trust has issued a series of certificates known as the Mortgage
      Pass-Through Certificates, Series 2006-8F (the “REMIC
      Classes”)
      evidencing the entire beneficial interests in the Underlying Trust;

     

    WHEREAS,
      all or a portion of the twelve separate Exchange Classes (as defined herein)
      issued hereunder (each representing an undivided beneficial ownership interest
      in the related Exchangeable REMIC Classes (as defined herein)), may be exchanged
      for a proportionate interest in such Exchangeable REMIC Classes in the
      combinations set forth on Appendix A and made a part hereof;

     

    WHEREAS,
      all or a portion of the Exchangeable REMIC Classes may be exchanged for the
      Exchange Classes in the same manner; and

     

    WHEREAS,
      the parties hereto desire to create this Trust to issue the Exchange Classes
      and
      the Exchangeable REMIC Classes subject to the terms and conditions set forth
      herein.

    

    NOW
      THEREFORE, the parties to this Trust Agreement, in the several capacities
      hereinabove set forth, do hereby declare and establish this Trust Agreement
      and
      do hereby undertake and otherwise agree as follows:

    

    ARTICLE
      I

     

    DEFINED
      TERMS

     

    Capitalized
      terms used and not defined herein shall have the respective meanings assigned
      to
      them in the Underlying Trust Agreement and the rules of construction set forth
      therein shall apply hereto. In addition, whenever used in this Trust Agreement,
      the following words and phrases, unless the context otherwise requires, shall
      have the following meanings:

     

    “Aggregate
      Denomination”:
      As to
      any Class and date of determination, the aggregate of the denominations of
      the
      Outstanding Certificates of such Class on such date.

     

    
      
        
        

      

      
        1

        
          

        

      

      
        
        

      

    

    “Authorized
      Officer”:
      The
      Chairman of the Board, the President or any Executive Vice President, Senior
      Vice President or Vice President.

     

    “Certificate”:
      A
      grantor trust pass-through security issued hereunder in a book-entry form as
      authorized by this Trust Agreement.

     

    “Certificate
      Registrar”:
      For
      the purposes of this Trust Agreement, the Certificate Registrar appointed
      pursuant to Section 5.04 of the Standard Terms which shall act as Certificate
      Registrar under this Trust Agreement subject to the terms and conditions and
      entitled to the same rights, protections and indemnities set forth in the Trust
      Agreement.

     

    “Class”:
      Each
      Class of Certificates issued or issuable hereunder as set forth in Section
      2.02
      hereto.

     

    “Class
      Balance”:
      With
      respect to any Class of Certificates, at any time, the aggregate of the
      Certificate Balances of all Outstanding Certificates of such Class.

     

    “Class
      Distribution Amount”:
      As to
      each Exchange Class and Distribution Date, an amount equal to the aggregate
      of
      the distributions on such Distribution Date in respect of each Related REMIC
      Class multiplied by a fraction, the numerator of which is equal to the Aggregate
      Denomination of such Related REMIC Class at the close of business on the related
      Record Date and the denominator of which is the Initial Authorized Denomination
      with respect to such Related REMIC Class. As to each Related REMIC Class, the
      sum of (i) the Class Interest Distribution Amount for such Class and (ii) the
      Class Principal Distribution Amount for such Class.

     

    “Class
      Interest Distribution Amount”:
      As to
      each Exchange Class and each Distribution Date, an amount equal to interest
      accrued during the related Interest Accrual Period (computed on the basis of
      a
      360-day year consisting of twelve 30-day months) at the applicable Interest
      Rate
      on the Class Balance or Notional Amount thereof, as applicable, immediately
      prior to such Distribution Date.

     

    “Class
      Principal Distribution Amount”:
      As to
      each Exchange Class and each Distribution Date, an amount as to principal equal
      to (i) the concurrent distribution of principal in respect of each Related
      REMIC
      Class multiplied by (ii) a fraction, the numerator of which is the Aggregate
      Denomination of such Exchange Class and the denominator of which is the Initial
      Authorized Denomination of such Exchange Class.

     

    “Code”:
      The
      Internal Revenue Code of 1986, as amended, including any successor or amendatory
      provisions.

     

    “Combination
      Group”:
      Any
      allowable combination of Certificates as set forth on Appendix A.

    

    “Distribution
      Date”:
      As to
      any Exchange Class, the Distribution Date for the Related REMIC
      Classes.

     

    
      
        
        

      

      
        2

        
          

        

      

      
        
        

      

    

    “Exchangeable
      REMIC Class”
      or “Exchangeable
      REMIC Certificates”:
      The Class 3A-6, Class 3A-9, Class
      4A-5, Class 4A-6, Class 4A-7, Class 4A-8, Class 4A-9 and Class 4A-10
      Certificates,
      or the Certificates of such Class, as the context may require, issued by the
      Underlying Trust in uncertificated form or the certificated pass through
      interests in such Classes or Certificates issued hereunder, as
      applicable.

    

    “Exchange
      Classes”
      or “Exchange
      Certificates”:
      The Class 3A-10, Class 3A-11, Class 4A-11, Class 4A-13, Class 4A-14, Class
      4A-15, Class 4A-16, Class 4A-17, Class 4A-18, Class 4A-19, Class 4A-20 and
      Class
      4A-21 Certificates,
      or the Certificates of each such Class, as the context may require.

    

    “Interest
      Accrual Period”:
      For
      any Distribution Date and Class of Exchange Certificates the calendar month
      immediately preceding the calendar month in which such Distribution Date occurs.
      

    

    “Initial
      Authorized Denomination”:
      With
      respect to any Class and Combination Group, the amount set forth with respect
      to
      such Class and such Combination Group in Appendix A under the heading, “Original
      Balance.”

     

    “Interest
      Rate”:
      With
      respect to each Interest Accrual Period and interest-bearing Related REMIC
      Class, the per annum rate specified or determined pursuant to the Underlying
      Trust Agreement for such Interest Accrual Period. With respect to each Interest
      Accrual Period and Exchange Class, the per annum rate set forth with respect
      to
      such Class on the cover of the prospectus supplement relating to the
      GSR 2006-8F Mortgage Loan Trust Pass-Through Certificates. 

     

    “Issue
      Date”:
      August
      25, 2006.

     

    “Outstanding
      Certificate”:
      Any
      Outstanding Exchange Certificate and Outstanding REMIC Certificate.

     

    “Outstanding
      Exchange Certificate”:
      Any
      Exchange Certificate issued on the Issue Date; provided,
      however,
      that
      upon the exchange of any Exchange Certificate pursuant to Section 2.03 hereof,
      the Exchange Certificate so exchanged shall be deemed no longer to be an
      Outstanding Certificate, and each Exchangeable REMIC Certificate issued in
      exchange therefor shall be deemed to be an Outstanding REMIC
      Certificate.

     

    “Outstanding
      Exchangeable REMIC Certificate”:
      Any
      Exchangeable REMIC Certificate issued on the Issue Date; provided,
      however,
      that
      upon the exchange of any Exchangeable REMIC Certificate pursuant to Section
      2.03
      hereof, the Exchangeable REMIC Certificate so exchanged shall be deemed no
      longer to be an Outstanding Exchangeable REMIC Certificate, and the Exchange
      Certificate issued in exchange therefor shall be deemed to be an Outstanding
      Exchange Certificate.

     

    “Paying
      Agent”:
      For
      the purposes of this Trust Agreement, the Paying Agent appointed pursuant to
      Section 5.08 of the Standard Terms which shall act as Paying Agent under this
      Trust Agreement subject to the same terms and conditions and entitled to the
      same rights, protections and indemnities set forth in the Trust
      Agreement.

     

    
      
        
        

      

      
        3

        
          

        

      

      
        
        

      

    

    “Prospectus”:
      The
      prospectus dated August 3, 2006, as supplemented by a prospectus supplement
      dated August 24, 2006, relating to the GSR Mortgage Loan Trust 2006-8F Mortgage
      Pass-Through Certificates, Series 2006-8F.

     

    “Realized
      Loss Allocation Amount”:
      As to
      each Exchange Class and Distribution Date, an amount equal to the aggregate
      of
      the Realized Losses on such Distribution Date in respect of each Related REMIC
      Class multiplied by a fraction, the numerator of which is equal to the Aggregate
      Denomination of such Related REMIC Class at the close of business on the related
      Record Date and the denominator of which is the Initial Authorized Denomination
      with respect to such Related REMIC Class. 

     

    “Related
      REMIC Class”:
      As to
      any Exchange Class, the Exchangeable REMIC Class included in the related
      Combination Group.”

     

    “Trust”:
      The
      trust created by this Trust Agreement, the corpus of which consists of the
      Trust
      Fund.

     

    “Trust
      Account”:
      As
      defined in Section 3.02 hereof.

     

    “Trust
      Fund”:
      The
      corpus of the trust created by this Trust Agreement, consisting of the Trust
      Account and the uncertificated interests in the Exchangeable REMIC Certificates
      issued by the Underlying Trust and all payments thereon and all rights
      thereunder.

     

    “Underlying
      Trust”:
      GSR
      Mortgage Loan Trust 2006-8F.

     

    ARTICLE
      II

     

    THE
      TRUST

     

    Section
      2.01. Transfer
      of Exchangeable REMIC Certificates.
      Upon
      the presentation and surrender by any Holder of its Exchangeable REMIC
      Certificates in the appropriate combination as set forth on Appendix A, such
      Holder shall hereunder transfer, assign, set over and otherwise convey to the
      Trustee, all of such Holder’s right, title and interest in and to such
      Exchangeable REMIC Certificates, including all payments of interest thereon
      received after the month of the Issue Date.

     

    U.S.
      Bank, acting in its capacity as Trustee, acknowledges (i) the transfer and
      assignment to it of the uncertificated Exchangeable REMIC Certificates pursuant
      to Section 4.05 of the Underlying Trust Agreement and Section 4(c) of the
      Underwriting Agreement and (ii) any transfer and assignment of certificated
      Exchangeable REMIC Certificates pursuant to the foregoing paragraph, and hereby
      declares that it will hold the same in trust for the Certificateholders on
      the
      terms in this Trust Agreement contained.

     

    
      
        
        

      

      
        4

        
          

        

      

      
        
        

      

    

    Section
      2.02. Certificates.
      The
      Certificates authorized by this Trust Agreement shall consist of
      each Exchange Class and certificated Exchangeable REMIC Class having the
      characteristics specified or determined as described in Appendix A, and
      otherwise shall be subject to the terms and provisions set forth herein.

     

    Section
      2.03. Exchanges.
      Exchange Certificates shall be exchangeable on the books of DTC for Exchangeable
      REMIC Certificates, and Exchangeable REMIC Certificates shall be exchangeable
      on
      the books of DTC for Exchange Certificates, on and after the Closing Date,
      by
      notice to the Securities Administrator substantially in the form of Exhibit
      I-1
      or Exhibit I-2 hereto or, under the terms and conditions hereinafter set forth
      and otherwise in accordance with the procedures specified in the Underlying
      Trust Agreement.

     

    In
      the
      case of each Combination Group, Certificates of the Classes of Exchangeable
      REMIC Certificates in such Combination Group shall be exchangeable for
      Certificates of the Class of Exchange Certificates related to such Combination
      Group in respective denominations determined based on the proportion that the
      initial Certificate Balances of such Exchangeable REMIC Certificates bear to
      the
      original Certificate Balance of the related Exchange Certificates, as set forth
      in Appendix A. Upon any such exchange the portions of the Exchangeable REMIC
      Certificates designated for exchange shall be deemed cancelled and replaced
      by
      the Exchange Certificate issued in exchange therefor. Correspondingly, Exchange
      Certificates related to a Combination Group may be further designated for
      exchange for Certificates of the Exchangeable REMIC Classes in such Combination
      Group in respective denominations determined based on the proportion that the
      initial Certificate Balances of such Exchangeable REMIC Certificates bear to
      the
      original Certificate Balances of the related Exchange Certificates, as set
      forth
      in Appendix A. There shall be no limitation on the number of exchanges
      authorized pursuant to this Section 2.03, and, except as provided in the
      following paragraph, no fee or other charge shall be payable to the Trustee,
      the
      Securities Administrator or DTC in connection therewith.

    

    In
      order
      to effect an exchange of Certificates, the Certificateholder shall notify the
      Securities Administrator in writing or by e-mail at sherri.j.sharps@wellsfargo.com
      or
sean.ralston@wellsfargo.com
      no later
      than two Business Days before the proposed exchange date. The exchange date
      may
      be any Business Day from and including the 25th
      day of
      the month to the second to the last Business Day of the month subject to the
      Securities Administrator’s approval. The notice must be on the
      Certificateholder’s letterhead, carry a medallion stamp guarantee and set forth
      the following information: the CUSIP number of both Certificates to be exchanged
      and Certificates to be received; outstanding Certificate Balance or Notional
      Amount and the Original Certificate Balance or Notional Amount of the
      Certificates to be exchanged; the Certificateholder’s DTC participant number;
      and the proposed exchange date. After receiving the notice, the Securities
      Administrator shall e-mail the Certificateholder with wire payment instructions
      relating to the exchange fee. A notice becomes irrevocable on the second
      Business Day before the proposed exchange date.

    

    Notwithstanding
      any other provision herein set forth, a fee shall be payable to the Securities
      Administrator in connection with each exchange equal to 1/32 of 1% of the
      Certificate Balance (or the notional amount, if no principal balance) of the
      Certificates (other than any Interest Only Certificates) to be exchanged. In
      no
      event, however, shall the fee be less than $2,000 or greater than
      $5,000.

    

    
      
        
        

      

      
        5

        
          

        

      

      
        
        

      

    

    The
      Securities Administrator shall make the first distribution on an Exchange
      Certificate or an Exchangeable REMIC Certificate received in an exchange
      transaction on the Distribution Date in the following month to the
      Certificateholder of record as of the close of business on the last day of
      the
      month of the exchange.

    

    Section
      2.04. Delivery
      of Instruments.
      The
      Securities Administrator shall furnish to each Holder, upon request, copies
      of
      this Trust Agreement, without attachments, applicable to the Certificate(s)
      held
      by such Holder.

     

    ARTICLE
      III

     

    CERTIFICATES;
      DISTRIBUTIONS

     

    Section
      3.01. Issuance
      of Certificates.
      The
      Classes of Certificates shall be issued in book-entry form and shall be
      maintained in the names of the record owners thereof as entries on the books
      of
      DTC. Such Certificates shall be in authorized minimum denominations of $25,000
      initial Certificate Balance or, if the Class Principal Balance of such Class
      of
      Certificates is less than $25,000, the Class Principal Balance thereof, and
      integral multiples of $1 in excess thereof and may be transferred or pledged
      in
      accordance with and subject to regulations governing use of the book-entry
      system (as the same shall be in effect at the time of any such transfer or
      pledge) and procedures that are followed generally for book-entry
      securities.

     

    Section
      3.02. Trust
      Account.
      On or
      before the Issue Date, the Securities Administrator shall either (i) open
      with a depository institution one or more trust accounts in the name of the
      Trustee on behalf of the Trust Fund that shall collectively be the “Trust
      Account,”
      (ii) in lieu of maintaining any such account or accounts, maintain the
      Trust Account by means of appropriate entries on its books and records
      designating all amounts credited thereto in respect of the Exchangeable REMIC
      Certificates and all investments of any such amounts as being held by it in
      its
      capacity as Securities Administrator for the benefit of the Holders of the
      Certificates or (iii) maintain the Trust Account in the form of any
      combination of accounts or book entries described in clauses (i) and (ii) above.
      Any manner or manners in which the Trust Account is maintained may at any time
      be changed without notice to, or the approval of Holders of, the Certificates
      so
      long as funds held in the Trust Fund by, or for the account of, the Securities
      Administrator shall at all times be identified. To the extent that the Trust
      Account is maintained by the Securities Administrator in the manner provided
      for
      in clause (ii) above, all references herein to deposits and withdrawals from
      the
      Trust Account shall be deemed to refer to credits and debits to the related
      books of the Securities Administrator.

     

    The
      Securities Administrator shall deposit in the Trust Account all distributions
      in
      respect of the Exchangeable REMIC Certificates received by it as Securities
      Administrator hereunder. All such distributions deposited from time to time
      in
      the Trust Account and all investments made with such moneys, including all
      income or other gain from such investments, shall be held by the Securities
      Administrator in the Trust Account as part of the Trust Fund as herein provided,
      subject to withdrawal by the Securities Administrator for distributions on
      the
      Certificates.

     

    
      
        
        

      

      
        6

        
          

        

      

      
        
        

      

    

    Section
      3.03. Distributions.
      On each
      Distribution Date, the Securities Administrator shall withdraw from the Trust
      Account the Class Distribution Amount for each Class and shall cause the Paying
      Agent to make the appropriate distributions to the Holders of each such Class.
      All distributions of such Class Distribution Amount that are made with respect
      to a particular Class shall be made pro
      rata
      among
      all Certificates of such class in proportion to their respective Certificate
      Balances, with no preference or priority of any kind. As among any Outstanding
      Exchange Classes, distributions shall be made to such Certificates, pro
      rata,
      in
      proportion to the Class Principal Balance of each such Class.

     

    Section
      3.04. Allocation
      of Realized Losses.
      On each
      Distribution Date, the Realized Loss Allocation Amount for each Exchange Class
      shall be applied to such Class. As among any Outstanding Exchange Certificates,
      such Realized Loss Allocation Amount shall be applied to each such Certificates
      of such Class, pro
      rata,
      in
      proportion to the principal balance of each such Class.

     

    ARTICLE
      IV

     

    LIMITATION
      OF LIABILITY

     

    The
      Trustee and the Securities Administrator shall be entitled to the same rights,
      protections and indemnities afforded to them under the Underlying Trust
      Agreement.

     

    ARTICLE
      V

     

    THE
      TRUSTEE

     

    In
      the
      event that there shall be any matter arising under the Underlying Trust
      Agreement that requires the vote of Holders of Certificates outstanding
      thereunder, the Trustee as the holder of the related Exchangeable REMIC
      Certificates shall vote such Exchangeable REMIC Certificates in such amounts
      and
      proportions as shall reflect instructions received from Holders of any
      Outstanding Exchange Certificates issued in exchange for such Exchangeable
      REMIC
      Certificates.

     

    

    ARTICLE
      VI

     

    TERMINATION

     

    The
      respective obligations and responsibilities of the Securities Administrator
      and
      the Trustee shall terminate as to the Trust Fund upon the same terms and
      conditions as the Underlying Trust Agreement may be amended or
      supplemented.

     

    
      
        
        

      

      
        7

        
          

        

      

      
        
        

      

    

    ARTICLE
      VII

     

    SUPPLEMENTAL
      AGREEMENTS

     

    This
      Trust Agreement may be amended or supplemented from time to time by the Master
      Servicer, the Depositor, the Securities Administrator and the Trustee upon
      the
      same terms and conditions as the Underlying Trust Agreement may be amended
      or
      supplemented.

     

    ARTICLE
      VIII

     

    MISCELLANEOUS

     

    Section
      8.01. Certificateholders.
      The
      death or incapacity of any Certificateholder shall neither operate to terminate
      this Trust Agreement, nor entitle such Certificateholder’s legal representative
      or heirs to claim an accounting or to take any action or proceeding in any
      court
      for a partition or winding-up of the affairs of the Trust Fund, nor otherwise
      affect the rights, duties and obligations of any of the parties to this Trust
      Agreement.

     

    Except
      as
      provided in Article V and Article VII, no Certificateholder shall have any
      right
      to vote or in any manner otherwise control the operation and management of
      the
      Trust Fund or the obligations of the parties hereto, nor shall anything herein
      set forth, or contained in the terms of the Certificates, be construed so as
      to
      constitute the Certificateholders from time to time as partners or members
      of an
      association; nor shall any Certificateholder be under any liability to any
      third
      person by reason of any action taken by the parties to this Trust Agreement
      pursuant to any provision hereof.

     

    No
      Certificateholder shall have any right, by virtue of any provision of this
      Trust
      Agreement, to institute any suit, action or proceeding in equity or at law
      upon
      or under or with respect to this Trust Agreement unless an Event of Default
      shall have occurred and be continuing in respect of this Trust Agreement. It
      is
      understood and intended, and is expressly covenanted by each Certificateholder
      with every other Certificateholder and the Trustee, that no one or more Holders
      of Certificates shall have any right in any manner whatever by virtue of any
      provision of this Trust Agreement to affect, disturb or prejudice the rights
      of
      the Holders of any other such Certificates, or to obtain or seek to obtain
      priority over or preference to any other such Holder, or to enforce any right
      under this Trust Agreement, except in the manner herein provided and for the
      equal, ratable and common benefit of all Certificateholders. For the protection
      and enforcement of the provisions of the Section, each and every
      Certificateholder and the Trustee shall be entitled to such relief as can be
      given either at law or in equity.

     

    Section
      8.02. Governing
      Law.
      THIS
      TRUST 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.

     

    
      
        
        

      

      
        8

        
          

        

      

      
        
        

      

    

    Section
      8.03. Demands,
      Notices and Communications.
      All
      formal demands, notices and communications by and among the Trustee, the
      Securities Administrator, the Certificate Registrar, the Paying Agent and the
      Holder of any Certificate shall be in writing and delivered in person or by
      first class mail, postage prepaid to the Trustee at its address set forth in
      the
      Underlying Trust Agreement. Any notice so mailed within the time prescribed
      in
      this Trust Agreement shall be conclusively presumed to have been duly given
      whether or not the Person to whom such notice shall have been directed receives
      such notice.

     

    Section
      8.04. Severability
      of Provisions.
      If any
      one or more of the covenants, agreements, provisions or terms of this Trust
      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 Trust Agreement and shall
      in
      no way affect the validity or enforceability of the other provisions of this
      Trust Agreement or of the Certificates or the rights of the Holders
      thereof.

     

    Section
      8.05. Tax
      Status and Reporting.
      It is
      the intended that the Trust Fund created hereunder be considered a “grantor
      trust” under the Code. Based upon such characterization, within a reasonable
      period of time after the end of each calendar year but not later than the latest
      date permitted by law, the Securities Administrator shall mail to each person
      who so requests in writing and who at anytime during such calendar year shall
      have been a Certificateholder the necessary information under applicable law
      for
      preparation of such Holder’s federal and state income tax returns unless
      substantially similar information has been previously provided to such
      Certificateholder.

     

    For
      federal income tax purposes, the grantor trust created hereunder shall have
      a
      calendar year taxable year. The Securities Administrator shall prepare or cause
      to be prepared and shall file or cause to be filed with the Internal Revenue
      Service and applicable state or local tax authorities, income tax information
      returns for each taxable year with respect to the grantor trust.

     

    
      
        
        

      

      
        9

        
          

        

      

      
        
        

      

    

    IN
      WITNESS WHEREOF, the parties hereto hereby execute this Trust Agreement, as
      of
      the day and year first above written.

     

    

     

    U.S.
      BANK
      NATIONAL ASSOCIATION,

    solely
      in
      its capacity as Trustee

     

    By:_____________________________

     

    Name:___________________________

     

    Title:____________________________

    

     

    
       

        WELLS
          FARGO BANK, N.A.,

        in
          its
          capacity as Securities Administrator 

        and
          Master Servicer

      

    

     

    By:______________________________

     

    Name:____________________________

     

    Title:_____________________________

     

    

     

    GS
      MORTGAGE SECURITIES CORP.,

    in
      its
      capacity as Depositor

     

    By:______________________________

     

    Name:____________________________

     

    Title:_____________________________

     

    
      
        
        

      

      
        10

        
          

        

      

      
        
        

      

    

    APPENDIX
      A

     

    AVAILABLE
      COMBINATIONS

    

    
      	
              Exchangeable
                REMIC Certificates

            	 	
              Exchangeable
                Certificates

            
	
              Collateral
                Group

            	
              Exchangeable
                REMIC 

              Class

            	
              Original
                

              Class
                Principal or
                Notional Balance(1)

            	
              CUSIP

               Number

            	 	
              Exchangeable
                Class

            	
              Original
                Class Principal Balance(1)

            	
              CUSIP

              Number

            
	 	
               

              Combination
                1

            	 	 	 	 	 	 
	
              3

            	
              3A-6

            	
              $47,130,000

            	
              362611
                AJ 4

            	 	
              3A-10

            	
              $47,130,000

            	
              362611
                BC 8

            
	 	
              3A-9

            	
              $1,885,200(2)

            	
              362611
                BB 0

            	 	 	 	 
	 	
               

              Combination
                2

            	 	 	 	 	 	 
	
              3

            	
              3A-6

            	
              $47,130,000

            	
              362611
                AJ 4

            	 	
              3A-11

            	
              $47,130,000

            	
              362611
                BD 6

            
	 	
              3A-9

            	
              $3,770,400(2)

            	
              362611
                BB 0

            	 	 	 	 
	 	
               

              Combination
                3

            	 	 	 	 	 	 
	
              4

            	
              4A-5

            	
              $3,635,000

            	
              362611
                AQ 8

            	 	
              4A-11

            	
              $3,635,000

            	
              362611
                BK 0

            
	 	
              4A-6

            	
              $139,807(2)

            	
              362611
                BE 4

            	 	 	 	 
	 	
               

              Combination
                4

            	 	 	 	 	 	 
	
              4

            	
              4A-7

            	
              $58,422,000

            	
              362611
                BF 1

            	 	
              4A-13

            	
              $58,422,000

            	
              362611
                BM 6

            
	 	
              4A-8

            	
              $2,247,000(2)

            	
              362611 BG
                9

            	 	 	 	 
	 	
               

              Combination
                5

            	 	 	 	 	 	 
	
              4

            	
              4A-7

            	
              $58,422,000

            	
              362611
                BF 1

            	 	
              4A-14

            	
              $58,422,000

            	
              362611
                BN 4

            
	 	
              4A-8

            	
              $4,494,000(2)

            	
              362611
                BG 9

            	 	 	 	 
	 	
               

              Combination
                6

            	 	 	 	 	 	 
	
              4

            	
              4A-9

            	
              $2,164,000

            	
              362611
                BH 7

            	 	
              4A-15

            	
              $2,164,000

            	
              362611
                BP 9

            
	 	
              4A-10

            	
              $83,230(2)

            	
              362611
                BJ 3

            	 	 	 	 
	 	
               

              Combination
                7

            	 	 	 	 	 	 
	
              4

            	
              4A-9

            	
              $2,164,000

            	
              362611
                BH 7

            	 	
              4A-16

            	
              $2,164,000

            	
              362611
                BQ 7

            
	 	
              4A-10

            	
              $166,461(2)

            	
              362611
                BJ 3

            	 	 	 	 
	 	
               

              Combination
                8

            	 	 	 	 	 	 
	
              4

            	
              4A-5

            	
              $3,635,000

            	
              362611
                AQ 8

            	 	
              4A-17

            	
              $64,221,000

            	
              362611
                BR 5

            
	 	
              4A-7

            	
              $58,422,000

            	
              362611
                BF 1

            	 	 	 	 
	 	
              4A-9

            	
              $2,164,000

            	
              362611
                BH 7

            	 	 	 	 

    

     

    
      
        
        

      

      
        I-1

        
          

        

      

      
        
        

      

    

     

      	
              Exchangeable
                REMIC Certificates

            	 	
              Exchangeable
                Certificates

            
	
              Collateral
                Group

            	
              Exchangeable
                REMIC 

              Class

            	
              Original
                

              Class
                Principal or
                Notional Balance(1)

            	
              CUSIP

               Number

            	 	
              Exchangeable
                Class

            	
              Original
                Class Principal Balance(1)

            	
              CUSIP

              Number

            

    

    
      	 	
               

              Combination
                9

            	 	 	 	 	 	 
	
              4

            	
              4A-5

            	
              $3,635,000

            	
              362611
                AQ 8

            	 	
              4A-18

            	
              $64,221,000

            	
              362611
                BS 3

            
	 	
              4A-6

            	
              $139,807(2)

            	
              362611
                BE 4

            	 	 	 	 
	 	
              4A-7

            	
              $58,422,000

            	
              362611
                BF 1

            	 	 	 	 
	 	
              4A-8

            	
              $2,247,000(2)

            	
              362611
                BG 9

            	 	 	 	 
	 	
              4A-9

            	
              $2,164,000

            	
              362611
                BH 7

            	 	 	 	 
	 	
              4A-10

            	
              $83,230(2)

            	
              362611
                BJ 3

            	 	 	 	 
	 	
               

              Combination
                10

            	 	 	 	 	 	 
	
              4

            	
              4A-5

            	
              $3,635,000

            	
              362611
                AQ 8

            	 	
              4A-19

            	
              $64,221,000

            	
              362611
                BT 1

            
	 	
              4A-6

            	
              $279,615(2)

            	
              362611
                BE 4

            	 	 	 	 
	 	
              4A-7

            	
              $58,422,000

            	
              362611
                BF 1

            	 	 	 	 
	 	
              4A-8

            	
              $4,494,000(2)

            	
              362611
                BG 9

            	 	 	 	 
	 	
              4A-9

            	
              $2,164,000

            	
              362611
                BH 7

            	 	 	 	 
	 	
              4A-10

            	
              $166,461(2)

            	
              362611
                BJ 3

            	 	 	 	 
	
              4

            	
               

              Combination
                11

            	 	 	 	 	 	 
	 	
              4A-4

            	
              $2,409,000

            	
              362611
                AP 0

            	 	
              4A-20

            	
              $66,630,000

            	
              362611
                BU 8

            
	 	
              4A-5

            	
              $3,635,000

            	
              362611
                AQ 8

            	 	 	 	 
	 	
              4A-6

            	
              $279,615(2)

            	
              362611
                BE 4

            	 	 	 	 
	 	
              4A-7

            	
              $58,422,000

            	
              362611
                BF 1

            	 	 	 	 
	 	
              4A-8

            	
              $4,494,000(2)

            	
              362611
                BG 9

            	 	 	 	 
	 	
              4A-9

            	
              $2,164,000

            	
              362611
                BH 7

            	 	 	 	 
	 	
              4A-10

            	
              $166,461(2)

            	
              362611
                BJ 3

            	 	 	 	 
	
              4

            	
               

              Combination
                12

            	 	 	 	 	 	 
	 	
              4A-6

            	
              $279,615(2)

            	
              362611
                BE 4

            	 	
              4A-21

            	
              $4,940,076(2)

            	
              362611
                BY 0

            
	 	
              4A-8

            	
              $4,494,000(2)

            	
              362611
                BG 9

            	 	 	 	 
	 	
              4A-10

            	
              $166,461(2)

            	
              362611
                BJ 3

            	 	 	 	 

    

     

    
      	(1)	
              Exchangeable
                REMIC Certificates and Exchange Certificates in any recombinations
                may be
                exchanged only in the proportion that the original balances of such
                certificates bear to one another as shown
                above.

            

    

     

    
      	(2)	
              Notional
                Amount.

            

    

    

    
      
        
        

      

      
        2

        
          

        

      

      
        
        

      

    

    EXHIBIT
      I-1

    

    FORM
      OF EXCHANGE LETTER

    

    

    

    ___,
      20__

    

    

    Wells
      Fargo Bank, N.A.

    Sixth
      Street and Marquette Avenue, 

    Minneapolis,
      Minnesota 55479, 

    Attention:
      GSR 2006-8F U.S. Bank National Association

    

    
      	 	
              Re:

            	
              GSR
                Mortgage Loan Trust 2006-8F,

            
	 	 	
              Mortgage
                Pass-Through Certificates,
                Series 2006-8F

            

    

    

    Ladies
      and Gentlemen:

    

    Pursuant
      to the terms of that certain Trust Agreement dated as of August 1, 2006 (the
      “Trust
      Agreement”),
      by
      and among GS Mortgage Securities Corp., as depositor, U.S. Bank National
      Association, as trustee (the “Trustee”)
      and
      Wells Fargo Bank, N.A., as master servicer and securities administrator (in
      such
      capacity, the “Securities
      Administrator”),
      we
      hereby present and surrender the Exchangeable REMIC Certificates specified
      on
Schedule
      I
      attached
      hereto (the “Exchangeable
      REMIC Certificates”)
      and
      transfer, assign, set over and otherwise convey to the Securities Administrator,
      all of our right, title and interest in and to the Exchangeable REMIC
      Certificates, including all payments of interest thereon received after the
      date
      hereof, in exchange for the Exchange Certificates specified on Schedule
      I
      attached
      hereto (the “Exchange
      Certificates”).
      

     

    We
      agree
      that upon such exchange the portions of the Exchangeable REMIC Certificates
      designated for exchange shall be deemed cancelled and replaced by the Exchange
      Certificates issued in exchange therefor. We confirm that we have paid a fee
      to
      the Securities Administrator in connection with such exchange equal to 1/32
      of
      1% of the Certificate Balance (as defined in the Trust Agreement) of the
      Exchangeable REMIC Certificates (other than any interest only Exchangeable
      REMIC
      Certificates) to be submitted for exchange (but not less than $2,000 nor more
      than $5,000).

     

    
      
        
        

      

      
        3

        
          

        

      

      
        
        

      

    

    
      	 	
              Sincerely,

            
	 	 	 	 
	 	 	 	 
	 	 	 	 
	 	
              By:
                

            	 	 
	 	 	
              Name:
                

            	 
	 	 	
              Title:
                

            	 

    

    

    
      
        
        

      

      
        I-4

        
          

        

      

      
        
        

      

    

    Acknowledged
      by:

    

    WELLS
      FARGO BANK, N.A., 

    as
      Securities Administrator

    

    

    
      	
              By:
                

            	 	 

    

    Name:
      

    Title:

    

    
      
        
        

      

      
        I-1

        
          

        

      

      
        
        

      

    

    EXHIBIT
      I-2

    

    FORM
      OF EXCHANGE LETTER

    

    

    

    ___,
      20__

    

    

    Wells
      Fargo Bank, N.A.

    Sixth
      Street and Marquette Avenue, 

    Minneapolis,
      Minnesota 55479, 

    Attention:
      GSR 2006-8F U.S. Bank National Association

    

    
      	 	
              Re:

            	
              GSR
                Mortgage Loan Trust 2006-8F,

            
	 	 	
              Mortgage
                Pass-Through Certificates,
                Series 2006-8F

            

    

    

    Ladies
      and Gentlemen:

    

    Pursuant
      to the terms of that certain Trust Agreement dated as of August 1, 2006 (the
      “Trust
      Agreement”),
      by
      and among GS Mortgage Securities Corp., as depositor, U.S. Bank National
      Association, as trustee (the “Trustee”)
      and
      Wells Fargo Bank, N.A., as master servicer and securities administrator (in
      such
      capacity, the “Securities
      Administrator”),
      we
      hereby present and surrender the Exchange Certificates specified on Schedule
      I
      attached
      hereto (the “Exchange
      Certificates”)and
      transfer, assign, set over and otherwise convey to the Securities Administrator,
      all of our right, title and interest in and to the Exchangeable REMIC
      Certificates, including all payments of interest thereon received after the
      date
      hereof, in exchange for the Exchangeable REMIC Certificates specified on
Schedule
      I
      attached
      hereto (the “Exchangeable
      REMIC Certificates”).
      

     

    We
      agree
      that upon such exchange the portions of the Exchange Certificates designated
      for
      exchange shall be deemed cancelled and replaced by the Exchangeable REMIC
      Certificates issued in exchange therefor. We confirm that we have paid a fee
      to
      the Securities Administrator in connection with such exchange equal to 1/32
      of
      1% of the Certificate Balance (as defined in the Trust Agreement) of the
      Exchange Certificates (other than any interest only Exchange Certificates)
      to be
      submitted for exchange (but not less than $2,000 nor more than
      $5,000).

     

    
      
        
        

      

      
        2

        
          

        

      

      
        
        

      

    

     

    
      
        	 	
                Sincerely,

              
	 	 	 	 
	 	 	 	 
	 	 	 	 
	 	
                By:
                  

              	 	 
	 	 	
                Name:
                  

              	 
	 	 	
                Title:
                  

              	 

      

      

      
        
          
          

        

        
          I-3

          
            

          

        

        
          
          

        

      

    

    

    Acknowledged
      by:

    

    WELLS
      FARGO BANK, N.A., 

    as
      Securities Administrator

    

     

    
      
        	
                By:
                  

              	 	 

      

      Name:
        

      Title:

      

      
        
          
          

        

        
          I-4

          
            

          

        

        
          
          

        

      

    

    SCHEDULE
      I

     

     

     

     

     

     

    
 

    
      
        
        

      

      
        I-5GS
      MORTGAGE SECURITIES CORP., DEPOSITOR

    MORTGAGE
      PASS-THROUGH CERTIFICATES, SERIES 2006-8F

    CLASS
      [     ] CERTIFICATE

     

    UNLESS
      THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY
      TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE TRUSTEE, IN ITS CAPACITY
      AS CUSTODIAN FOR DTC (IN SUCH CAPACITY, THE “CUSTODIAN”) OR ITS AGENT FOR
      REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE 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 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.

     

    [THE
      YIELD TO THE HOLDER OF THIS CERTIFICATE WILL BE EXTREMELY SENSITIVE TO THE
      RATE
      OF PRINCIPAL PAYMENTS (INCLUDING PREPAYMENTS) ON THE MORTGAGE
      LOANS.]

     

    [THIS
      CLASS [    ] CERTIFICATE SHALL NOT BE ENTITLED TO ANY
      DISTRIBUTIONS WITH RESPECT TO PRINCIPAL.]

     

    [THIS
      CLASS [    ] CERTIFICATE IS SUBORDINATED TO THE EXTENT DESCRIBED
      HEREIN AND IN THE TRUST AGREEMENT REFERENCED HEREIN.]

     

    [THIS
      CLASS [    ] CERTIFICATE REPRESENTS A REMIC REGULAR INTEREST FOR
      FEDERAL INCOME TAX PURPOSES.]

     

    [FOR
      FEDERAL INCOME TAX PURPOSES, THIS CLASS [    ] CERTIFICATE
      REPRESENTS OWNERSHIP OF A REMIC REGULAR INTEREST AND A RIGHT TO RECEIVE PAYMENT
      FROM A BASIS RISK RESERVE FUND.]

     

    [THE
      PRINCIPAL OF THIS CLASS [    ] CERTIFICATE IS SUBJECT TO
      PREPAYMENT FROM TIME TO TIME WITHOUT SURRENDER OF OR NOTATION ON THIS
      CERTIFICATE. ACCORDINGLY, THE CERTIFICATE PRINCIPAL BALANCE OF THIS CERTIFICATE
      MAY BE LESS THAN THAT SET FORTH BELOW. ANYONE ACQUIRING THIS CERTIFICATE MAY
      ASCERTAIN ITS CURRENT CERTIFICATE PRINCIPAL BALANCE BY INQUIRY OF THE
      CUSTODIAN.]

    
      
        
        

      

      
        
        

        
          

        

      

       

    

     

    GS
      MORTGAGE SECURITIES CORP., DEPOSITOR

    MORTGAGE
      PASS-THROUGH CERTIFICATES, SERIES 2006-8F

    CLASS
      [     ] CERTIFICATE

     

    
      	
              MAXIMUM
                AGGREGATE INITIAL CERTIFICATE [PRINCIPAL] [NOTIONAL] BALANCE OF THE
                CLASS
                [   ] CERTIFICATES AS OF THE CLOSING DATE: $[   
                ]

               

            	 	
              INITIAL
                CERTIFICATE [PRINCIPAL] [NOTIONAL] BALANCE OF THIS CERTIFICATE AS
                OF THE
                CLOSING DATE: $[    ]

               

            
	
              INITIAL
                CERTIFICATE RATE PER ANNUM: [    ]%

               

            	 	
              PERCENTAGE
                INTEREST: [    ]%

               

            
	
              MINIMUM

              DENOMINATION:

               

            	 	
              $[ 
                 ] AND $1 IN EXCESS OF $[    ]

               

            
	
              DATE
                OF THE TRUST AGREEMENT: AS OF

              AUGUST
                1, 2006

               

            	 	
              AGGREGATE
                SCHEDULED PRINCIPAL BALANCE AS OF THE CUT-OFF DATE OF THE MORTGAGE
                LOANS
                HELD BY THE TRUST: $622,239,465

               

            
	
              CLOSING
                DATE:

              AUGUST
                25, 2006

               

            	 	 
	
              FIRST
                DISTRIBUTION DATE:

              SEPTEMBER
                25, 2006

               

            	 	 
	
              SCHEDULED
                FINAL DISTRIBUTION DATE:

              [  
                ]

               

            	 	
              TRUSTEE:
                U.S. BANK, NATIONAL ASSOCIATION

               

            
	 	 	
              CUSTODIAN:
                DEUTSCHE BANK NATIONAL TRUST COMPANY 

               

            
	
              NO.
                [    ]

               

            	 	
              CUSIP
                NO.: [    ]

               

            

    

     

    
      
        
        

      

      
        
        

        
          

        

      

       

    

    GS
      MORTGAGE SECURITIES CORP., DEPOSITOR

    MORTGAGE
      PASS-THROUGH CERTIFICATES, SERIES 2006-8F

    CLASS
      [     ] CERTIFICATE

     

    evidencing
      a beneficial ownership interest in a Trust Fund consisting of the entire
      beneficial ownership of a pool of certain fixed-rate, one- to four-family,
      first
      lien Mortgage Loans formed and sold by

    

    GS
      MORTGAGE SECURITIES CORP.

     

    THIS
      CERTIFICATE DOES NOT REPRESENT AN OBLIGATION OF OR INTEREST IN, AND IS NOT
      GUARANTEED BY, GS MORTGAGE SECURITIES CORP., THE SERVICERS, THE TRUSTEE, THE
      CUSTODIANS OR ANY OF THEIR AFFILIATES. 

     

    THIS
      CERTIFIES THAT:

     

    CEDE
      & CO.

     

    is
      the
      registered owner of the Percentage Interest evidenced by this Certificate in
      the
      Class [    ] Certificates (the “Class [    ]
      Certificates”) issued pursuant to a master servicing and trust agreement, dated
      as specified above (the “Trust Agreement”), among GS Mortgage Securities Corp.,
      as Depositor (hereinafter the “Depositor,” which term includes any successor
      entity under the Trust Agreement), Wells Fargo Bank, N.A., as securities
      administrator and master servicer (in such capacities, the “Securities
      Administrator” and the “Master Servicer,” respectively), Deutsche Bank National
      Trust Company, as custodian (a “Custodian”), U.S. Bank National Association, as
      Trustee (the “Trustee”) and custodian (a “Custodian”) and JPMorgan Chase Bank,
      National Association, as custodian (a “Custodian”), a summary of certain of the
      pertinent provisions of which is set forth hereafter. The Trust Fund consists
      primarily of a pool of Mortgage Loans. This Certificate is issued under and
      is
      subject to the terms, provisions and conditions of the Trust Agreement and
      also
      is subject to certain terms and conditions set forth in the Assignment
      Agreements and the related documents assigned pursuant thereto to which the
      Holder of this Certificate, by virtue of the acceptance hereof, assents and
      by
      which such Certificateholder is bound.

     

      [Distributions
      of principal of and interest on this Certificate (including the final
      distribution on this Certificate) will be made out of the related Available
      Distribution Amount, to the extent and subject to the limitations set forth
      in
      the Trust Agreement, on the 25th day of each month, or if such day is not a
      Business Day, the next succeeding Business Day, beginning in September 2006
      (each, a “Distribution Date”), commencing on the first Distribution Date
      specified above, to the Person in whose name this Certificate is registered
      at
      the close of business on the last Business Day of the related Interest Accrual
      Period (the “Record Date”). The “Interest Accrual Period” for any Distribution
      Date is the immediately preceding calendar month. All sums distributable on
      this
      Certificate are payable in the coin or currency of the United States of America
      as at the time of payment is legal tender for the payment of public and private
      debts.]

     

    [Distributions
      of principal of and interest on this Certificate (including the final
      distribution on this Certificate) will be made out of the related Available
      Distribution Amount, to the extent and subject to the limitations set forth
      in
      the Trust Agreement, on the 25th day of each month, or if such day is not a
      Business Day, the next succeeding Business Day, beginning in September 2006
      (each, a “Distribution Date”), commencing on the first Distribution Date
      specified above, to the Person in whose name this Certificate is registered
      at
      the close of business on the last Business Day of the related Interest Accrual
      Period (the “Record Date”). The “Interest Accrual Period” for any Distribution
      Date is the period beginning on and including the 25th
      day of
      the month immediately preceeding the month in which such Distribution Date
      occurs and ending on and including the 24th
      day of
      the month in which such Distribution Date occurs. All sums distributable on
      this
      Certificate are payable in the coin or currency of the United States of America
      as at the time of payment is legal tender for the payment of public and private
      debts.]

    
      
        
        

      

      
        
        

        
          

        

      

       

    

     

    [Distributions
      of interest on this Certificate (including the final distribution on this
      Certificate) will be made out of the related Available Distribution Amount,
      to
      the extent and subject to the limitations set forth in the Trust Agreement,
      on
      the 25th day of each month, or if such day is not a Business Day, the next
      succeeding Business Day, beginning in September 2006 (each, a “Distribution
      Date”), commencing on the first Distribution Date specified above, to the Person
      in whose name this Certificate is registered at the close of business on the
      last Business Day of the related Interest Accrual Period (the “Record Date”).
      The “Interest Accrual Period” for any Distribution Date is the period beginning
      on and including the 25th
      day of
      the month immediately preceeding the month in which such Distribution Date
      occurs and ending on and including the 24th
      day of
      the month in which such Distribution Date occurs. All sums distributable on
      this
      Certificate are payable in the coin or currency of the United States of America
      as at the time of payment is legal tender for the payment of public and private
      debts.]

     

    [Distributions
      of principal of this Certificate (including the final distribution on this
      Certificate) will be made out of the related Available Distribution Amount,
      to
      the extent and subject to the limitations set forth in the Trust Agreement,
      on
      the 25th day of each month, or if such day is not a Business Day, the next
      succeeding Business Day, beginning in September 2006 (each, a “Distribution
      Date”), commencing on the first Distribution Date specified above, to the Person
      in whose name this Certificate is registered at the close of business on the
      last Business Day of the related Interest Accrual Period (the “Record Date”).
      All sums distributable on this Certificate are payable in the coin or currency
      of the United States of America as at the time of payment is legal tender for
      the payment of public and private debts.]

     

    Principal
      of and interest on this Certificate will be paid in accordance with the terms
      of
      the Trust Agreement, the Assignment Agreements and the related documents
      assigned pursuant thereto. Principal and interest allocated to this Certificate
      on any Distribution Date will be an amount equal to this Certificate’s
      Percentage Interest of the Available Distribution Amount to be distributed
      on
      this Class of Certificates as of such Distribution Date, with a final
      distribution to be made upon retirement of this Certificate as set forth in
      the
      Trust Agreement.

     

    [This
      Certificate will not be entitled to any distribution of principal. Distributions
      of interest on this Certificate will be paid in accordance with the terms of
      the
      Trust Agreement, the Assignment Agreements and the related documents assigned
      pursuant thereto. Interest allocated to this Certificate on any Distribution
      Date will be in an amount equal to this Certificate’s Percentage Interest of the
      Available Distribution Amount to be distributed on this Class of Certificates
      as
      of such Distribution Date, with a final distribution to be made upon retirement
      of this Certificate as set forth in the Trust Agreement.]

    
 

    
      
        
        

      

      
        
        

        
          

        

      

       

    

    
       

      [This
        Certificate will not be entitled to any distribution of interest. Principal
        of
        this Certificate will be paid in accordance with the terms of the Trust
        Agreement, the Assignment Agreements and the related documents assigned pursuant
        thereto. Principal allocated to this Certificate on any Distribution Date
        will
        be an amount equal to this Certificate’s Percentage Interest of the Available
        Distribution Amount to be distributed on this Class of Certificates as of
        such
        Distribution Date, with a final distribution to be made upon retirement of
        this
        Certificate as set forth in the Trust Agreement.]

       

    

    This
      Certificate is one of a duly authorized issue of Certificates designated as
      Mortgage Pass-Through Certificates, Series 2006-8F (herein called the
“Certificates”), and representing a Percentage Interest in the Class of
      Certificates specified on the face hereof equal to the quotient, expressed
      as a
      percentage, obtained by dividing the denomination of this Certificate specified
      on the face hereof by the aggregate Certificate Balance of all the Class
      [    ] Certificates. The Certificates are issued in multiple
      Classes designated as specifically set forth in the Trust Agreement. The
      Certificates will evidence in the aggregate 100% of the beneficial ownership
      of
      the Trust Fund.

     

    All
      distributions or allocations made with respect to each Class on any Distribution
      Date shall be allocated in accordance with the Trust Agreement. Payment shall
      be
      made either (1) by check mailed to the address of each Certificateholder as
      it
      appears in the Certificate Register on the Record Date immediately prior to
      such
      Distribution Date or (2) by wire transfer of immediately available funds to
      the
      account of a Certificateholder at a bank or other entity having appropriate
      facilities therefor, if such Certificateholder shall have so notified the
      Securities Administator in writing by the Record Date immediately prior to
      such
      Distribution Date and such Certificateholders is the registered owner of Regular
      Certificates with an initial Certificate Balance of at least $1,000,000. The
      Securities Administator may charge the Certificateholder a fee for any payment
      made by wire transfer. Final distribution on the Certificates will be made
      only
      upon surrender of the Certificates at the offices of the Certificate Registrar
      set forth in the notice of such final distribution.

     

    The
      Certificates are issuable in fully registered form only, without coupons, in
      denominations specified in the Trust Agreement. As provided in the Trust
      Agreement and subject to any limitations on transfer of this Certificate by
      a
      Depository or its nominee and certain limitations set forth in the Trust
      Agreement, the transfer of this Certificate is registrable in the Certificate
      Register upon surrender of this Certificate for registration of transfer at
      the
      principal Corporate Trust Office of the Securities Administrator or such other
      offices or agencies appointed by the Securities Administrator for that purpose
      and such other locations provided in the Trust Agreement, duly endorsed by
      or
      accompanied by an assignment in the form below or other written instrument
      of
      transfer in form satisfactory to the Securities Administrator and the
      Certificate Registrar duly executed by the Certificateholder hereof, or such
      Certificateholder’s attorney duly authorized in writing, and thereupon one or
      more new Certificates of the same Class in the same aggregate Certificate
      Balance will be issued to the designated transferee or transferees.

     

    As
      provided in the Trust Agreement and subject to certain limitations therein
      set
      forth, this Certificate is exchangeable for a new Certificate of the same Class
      in the same denomination. No service charge will be made for any such
      registration of transfer or exchange, but the Custodian may require payment
      of a
      sum sufficient to cover any tax or other governmental charge that may be imposed
      in connection with any transfer or exchange of Certificates.

    
      
        
        

      

      
        
        

        
          

        

      

       

    

     

    The
      Depositor, the Securities Administrator, the Master Servicer, the Servicers,
      the
      Trustee, the Custodians and the Certificate Registrar and any agent of the
      Depositor, the Securities Administrator, the Master Servicer, the Servicers,
      the
      Trustee, the Custodians or the Certificate Registrar may treat the Person in
      whose name this Certificate is registered as the owner hereof for all purposes,
      and none of the Depositor, the Securities Administrator, the Master Servicer,
      the Trustee, the Custodians, the Servicers, the Certificate Registrar or any
      such agent shall be affected by notice to the contrary.

     

    The
      obligations created by the Trust Agreement will terminate upon payment to the
      Certificateholders of all amounts held in the Collection Account and the
      Certificate Account required to be paid to the Certificateholders pursuant
      to
      the Trust Agreement, following the earlier of: (i) the final payment or other
      liquidation (or any advance with respect thereto) of the last Mortgage Loan
      remaining in the Trust Fund or the disposition of all property acquired upon
      foreclosure of any such Mortgage Loan and (ii) the purchase of all the assets
      of
      the Trust Fund by the Class C Certificateholder or the Master Servicer as
      specified in the Trust Agreement, when the aggregate Scheduled Principal Balance
      of the Mortgage Loans equals 1% or less of the aggregate Scheduled Principal
      Balance of the Mortgage Loans as of the Cut-off Date. Written notice of
      termination will be given to each Certificateholder, and the final distribution
      will be made only upon surrender and cancellation of the Certificates at an
      office or agency appointed by the Securities Administrator, which will be
      specified in the notice of termination.

     

    Unless
      the certificate of authentication hereon has been executed by the Certificate
      Registrar, by manual signature, this Certificate shall not be entitled to any
      benefit under the Trust Agreement or be valid for any purpose.

     

    THIS
      CERTIFICATE AND THE TRUST 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.

     

    The
      Trustee has executed this Certificate on behalf of the Trust as Trustee under
      the Trust Agreement, and the Trustee shall be liable hereunder only in respect
      of the assets of the Trust Fund.

     

    Capitalized
      terms used herein and not defined herein shall have the meaning given them
      in
      the Trust Agreement.

    
      
        
        

      

      
        
        

        
          

        

      

       

    

     

     

    IN
      WITNESS WHEREOF, the Trustee has caused this Certificate to be duly
      executed.

     

    
      	Dated:
              August
              ____, 2006	 	 
	 	
              U.S.
                BANK NATIONAL ASSOCIATION,

              as
                Trustee

            
	 
 	 
 	 
 
	 	By:  	 
	 	
              
AUTHORIZED
              OFFICER

    

     

    CERTIFICATE
      OF AUTHENTICATION

     

    THIS
      IS
      ONE OF THE CERTIFICATES REFERRED TO IN THE WITHIN-MENTIONED TRUST
      AGREEMENT.

     

    
      	 	 	 
	 	
              WELLS
                FARGO BANK, N.A.,

              as
                Certificate Registrar

            
	 
 	 
 	 
 
	 	By:  	 
	 	
              
AUTHORIZED
              SIGNATORY

    

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    

    ABBREVIATIONS

     

    The
      following abbreviations, when used in the inscription on the face of this
      Certificate, shall be construed as though they were written out in full
      according to applicable laws or regulations:

     

    
      	
              TEN
                COM-as tenants in common

            	 	
              UNIF
                GIFT MIN ACT -  

            	
              Custodian 

                

              

              (Cust)
                (Minor)

            
	
              TEN
                ENT -as tenants by the entireties

            	 	 
	
              JT
                T EN- as joint tenants with rights of survivorship and not as Tenants
                in
                Common

            	 	
              Under
                Uniform Gifts to Minors Act_________

              (State)

            

    

     

    Additional
      abbreviations may also be used though not in the above list.

    
      
        
        

      

      
        
        

        
          

        

      

       

    

     

    FORM
      OF
      TRANSFER

     

    FOR
      VALUE
      RECEIVED, the undersigned hereby sells, assigns and transfers unto 

     

    _________________________________________________________

     

    PLEASE
      INSERT SOCIAL SECURITY

    OR
      OTHER
      IDENTIFYING NUMBER OFASSIGNEE
      _____________________________________________________________________________________

    _____________________________________________________________________________________________________

    (Please
      print or typewrite name and address of assignee) 

    

    the
      within Certificate and does hereby irrevocably constitute and appoint
      _____________________(Attorney)
      to transfer the said Certificate in the Certificate Register of the within-named
      Trust, with full power of substitution in the premises.

    

    
      	 	 	 
	Dated:______________________________________	 	
              ___________________________________________

              NOTICE: The signature to this assignment must
                correspond
                with the name as written upon the face of this Certificate in every
                particular without alteration or enlargement or any change
                whatever.

            
	
              ___________________________________________

              SIGNATURE
                GUARANTEED: The signature must be guaranteed by a commercial bank
                or trust
                company or by a member firm of the New York Stock Exchange for another
                national Certificates exchange. Notarized or witnessed signatures
                are not
                acceptable.

            	 	 

      
        
          
          

        

        
          
          

          
            

          

        

         

      

    

     

    DISTRIBUTION
      INSTRUCTIONS

     

    The
      assignee should include the following for purposes of distribution:

     

    Distribution
      shall be made, by wire transfer or otherwise, in immediately available funds,
      to
      __________________________, for the account of ____________________, account
      number ________________, or if mailed by check to
      ______________________________. Applicable reports and statements should be
      mailed to __________________. This information is provided by
      ____________________________, the assignee named above, or _______________,
      as
      agent.

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