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POOLING AND SERVICING AGREEMENT

Pooling and Servicing Agreement

POOLING AND SERVICING AGREEMENT | Document Parties: MERRILL LYNCH MORTGAGE INVESTORS TRUST SERIES 2006-SD1 | WILSHIRE CREDIT CORPORATION You are currently viewing:
This Pooling and Servicing Agreement involves

MERRILL LYNCH MORTGAGE INVESTORS TRUST SERIES 2006-SD1 | WILSHIRE CREDIT CORPORATION

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Title: POOLING AND SERVICING AGREEMENT
Governing Law: Delaware     Date: 9/27/2006
Law Firm: Dechert    

POOLING AND SERVICING AGREEMENT, Parties: merrill lynch mortgage investors trust series 2006-sd1 , wilshire credit corporation
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<PAGE>

                                                                     Exhibit 4.1

                                                                  EXECUTION COPY

                     MERRILL LYNCH MORTGAGE INVESTORS, INC.,
                                     Depositor

                          WILSHIRE CREDIT CORPORATION,
                                    Servicer

                                       and

                       LASALLE BANK NATIONAL ASSOCIATION,
                                      Trustee

                                   ----------

                         POOLING AND SERVICING AGREEMENT
                           Dated as of August 1, 2006

                                   ----------

                     MERRILL LYNCH MORTGAGE INVESTORS TRUST,
            MORTGAGE LOAN ASSET-BACKED CERTIFICATES, SERIES 2006-SD1

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                          <C>
ARTICLE I DEFINITIONS....................................................       8

ARTICLE II CONVEYANCE OF MORTGAGE LOANS; REPRESENTATIONS AND WARRANTIES..      56
   SECTION 2.01.   Conveyance of Mortgage Loans...........................      56
   SECTION 2.02.   Acceptance by the Trustee of the Mortgage Loans........      59
   SECTION 2.03.   Representations, Warranties and Covenants of the
                  Depositor..............................................      60
   SECTION 2.04.   Representations and Warranties of the Servicer.........      65
   SECTION 2.05.   Substitutions and Repurchases of Mortgage Loans that
                  are not "Qualified Mortgages"..........................      66
   SECTION 2.06.   Authentication and Delivery of Certificates............      66
   SECTION 2.07.   REMIC Elections........................................       66
   SECTION 2.08.   [RESERVED].............................................      71
   SECTION 2.09.   Covenants of the Servicer..............................      71
   SECTION 2.10.   [RESERVED].............................................      71
   SECTION 2.11.   Permitted Activities of the Trust......................      71
   SECTION 2.12.   Qualifying Special Purpose Entity......................      71
   SECTION 2.13.   Depositor Notification of NIM Notes....................      71

ARTICLE III ADMINISTRATION AND SERVICING OF MORTGAGE LOANS...............      72
   SECTION 3.01.   Servicer to Service Mortgage Loans.....................      72
   SECTION 3.02.   Servicing and Subservicing; Enforcement of the
                  Obligations of Servicer................................      73
   SECTION 3.03.   Rights of the Depositor and the Trustee in Respect of
                  the Servicer...........................................      74
   SECTION 3.04.   Trustee to Act as Servicer.............................      74
   SECTION 3.05.   Collection of Mortgage Loan Payments; Collection
                  Account; Certificate Account...........................      75
   SECTION 3.06.   Collection of Taxes, Assessments and Similar Items;
                  Escrow Accounts........................................      79
   SECTION 3.07.   Access to Certain Documentation and Information
                  Regarding the Mortgage Loans...........................      79
   SECTION 3.08.   Permitted Withdrawals from the Collection Account and
                  Certificate Account....................................      80
   SECTION 3.09.   [RESERVED].............................................      82
   SECTION 3.10.   Maintenance of Hazard Insurance........................      82
   SECTION 3.11.   Enforcement of Due-On-Sale Clauses; Assumption
                  Agreements.............................................      83
</TABLE>


                                       -i-

<PAGE>

                                TABLE OF CONTENTS
                                   (continued)

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                           <C>
   SECTION 3.12.   Realization Upon Defaulted Mortgage Loans;
                  Determination of Excess Proceeds; Special Loss
                  Mitigation.............................................      84
   SECTION 3.13.   Trustee to Cooperate; Release of Mortgage Files........      87
   SECTION 3.14.   Documents, Records and Funds in Possession of Servicer
                  to be Held for the Trustee.............................      88
   SECTION 3.15.   Servicing Compensation.................................      88
   SECTION 3.16.   Access to Certain Documentation........................      89
   SECTION 3.17.   Annual Statement as to Compliance......................      89
   SECTION 3.18.   Annual Independent Public Accountants' Servicing
                  Statement; Financial Statements........................      89
   SECTION 3.19.   [Reserved].............................................      92
   SECTION 3.20.   Periodic Filings.......................................      92
   SECTION 3.21.   Indemnification by Trustee.............................      96
   SECTION 3.22.   Indemnification by Servicer............................      96
   SECTION 3.23.   Prepayment Charge Reporting Requirements...............      97
   SECTION 3.24.   Information to the Trustee.............................      97
   SECTION 3.25.   Indemnification........................................      97
   SECTION 3.26.   Nonsolicitation........................................      98
   SECTION 3.27.   High Cost Mortgage Loans...............................      98
   SECTION 3.28.   Special Servicing Agreements...........................      98

ARTICLE IV DISTRIBUTIONS.................................................      99
   SECTION 4.01.   Advances...............................................      99
   SECTION 4.02.   Reduction of Servicing Compensation in Connection with
                  Prepayment Interest Shortfalls.........................     100
   SECTION 4.03.   Distributions on the REMIC Interests...................     100
   SECTION 4.04.   Distributions..........................................     100
   SECTION 4.05.   Monthly Statements to Certificateholders...............     108

ARTICLE V THE CERTIFICATES...............................................     113
   SECTION 5.01.   The Certificates.......................................     113
   SECTION 5.02.   Certificate Register; Registration of Transfer and
                  Exchange of Certificates...............................     114
   SECTION 5.03.   Mutilated, Destroyed, Lost or Stolen Certificates......     118
   SECTION 5.04.   Persons Deemed Owners..................................     119
   SECTION 5.05.   Access to List of Certificateholders' Names and
                   Addresses..............................................     119
</TABLE>


                                      -ii-

<PAGE>

                                TABLE OF CONTENTS
                                   (continued)

<TABLE>
<CAPTION>
                                                                             PAGE
                                                                            ----
<S>                                                                          <C>
   SECTION 5.06.   Book-Entry Certificates................................     119
   SECTION 5.07.   Notices to Depository..................................     120
   SECTION 5.08.   Definitive Certificates................................     120
   SECTION 5.09.   Maintenance of Office or Agency........................     121
   SECTION 5.10.   Authenticating Agents..................................     121

ARTICLE VI THE DEPOSITOR AND THE SERVICER................................     122
   SECTION 6.01.   Respective Liabilities of the Depositor and the
                  Servicer...............................................     122
   SECTION 6.02.   Merger or Consolidation of the Depositor or the
                  Servicer...............................................     122
   SECTION 6.03.   Limitation on Liability of the Depositor, the Servicer
                  and Others.............................................     122
   SECTION 6.04.   Limitation on Resignation of Servicer..................     123
   SECTION 6.05.   Errors and Omissions Insurance; Fidelity Bonds.........     124

ARTICLE VII DEFAULT; TERMINATION OF SERVICER.............................     124
   SECTION 7.01.   Events of Default......................................     124
   SECTION 7.02.   Trustee to Act; Appointment of Successor...............     126
   SECTION 7.03.   Notification to Certificateholders.....................     127

ARTICLE VIII CONCERNING THE TRUSTEE......................................     127
   SECTION 8.01.   Duties of the Trustee..................................     127
   SECTION 8.02.   Certain Matters Affecting the Trustee..................     128
   SECTION 8.03.   Trustee Not Liable for Certificates or Mortgage Loans..     130
   SECTION 8.04.   Trustee May Own Certificates...........................     130
   SECTION 8.05.   Trustee's Fees and Expenses............................     130
   SECTION 8.06.   Indemnification and Expenses of Trustee................     130
   SECTION 8.07.   Eligibility Requirements for Trustee...................     131
    SECTION 8.08.   Resignation and Removal of Trustee.....................     132
   SECTION 8.09.   Successor Trustee......................................     132
   SECTION 8.10.   Merger or Consolidation of Trustee.....................     133
   SECTION 8.11.   Appointment of Co-Trustee or Separate Trustee..........     133
   SECTION 8.12.   Tax Matters............................................     134

ARTICLE IX TERMINATION...................................................     136
   SECTION 9.01.   Termination upon Liquidation or Repurchase of all
                  Mortgage Loans.........................................     136
   SECTION 9.02.   Final Distribution on the Certificates.................     138
   SECTION 9.03.   Additional Termination Requirements....................     139
</TABLE>


                                      -iii-

<PAGE>

                                TABLE OF CONTENTS
                                   (continued)

<TABLE>
<CAPTION>
                                                                             PAGE
                                                                            ----
<S>                                                                          <C>
ARTICLE X MISCELLANEOUS PROVISIONS.......................................     140
   SECTION 10.01. Amendment..............................................     140
   SECTION 10.02. Counterparts...........................................     142
   SECTION 10.03. Governing Law..........................................     142
   SECTION 10.04. Intention of Parties...................................     142
   SECTION 10.05. Notices................................................     143
   SECTION 10.06. Severability of Provisions.............................     144
   SECTION 10.07. Assignment.............................................     144
   SECTION 10.08. Limitation on Rights of Certificateholders.............     145
   SECTION 10.09. Inspection and Audit Rights............................     146
   SECTION 10.10. Certificates Nonassessable and Fully Paid..............     146
   SECTION 10.11. Compliance with Regulation AB..........................     146
   SECTION 10.12. Third Party Rights.....................................     146
</TABLE>


                                       -iv-

<PAGE>

                                    EXHIBITS

EXHIBIT A      FORMS OF CERTIFICATES
EXHIBIT B-1    MORTGAGE LOAN SCHEDULE
EXHIBIT B-2    NON-PERFORMING MORTGAGE LOAN SCHEDULE
EXHIBIT C      [RESERVED]
EXHIBIT D      FORM OF TRUSTEE CERTIFICATION
EXHIBIT E-1    FORM OF TRANSFEREE'S LETTER AND AFFIDAVIT
EXHIBIT E-2    FORM OF TRANSFEROR'S AFFIDAVIT
EXHIBIT F      FORM OF TRANSFEROR CERTIFICATE
EXHIBIT G      FORM OF INVESTMENT LETTER (ACCREDITED INVESTOR)
EXHIBIT H      FORM OF RULE 144A LETTER (QUALIFIED INSTITUTIONAL BUYER)
EXHIBIT I      FORM OF REQUEST FOR RELEASE
EXHIBIT J      [RESERVED]
EXHIBIT K      FORM OF BACK-UP CERTIFICATION OF TRUSTEE
EXHIBIT L      FORM OF OFFICER'S CERTIFICATE OF SERVICER
EXHIBIT M      FORM OF CAP CONTRACT
EXHIBIT N      ONE-MONTH LIBOR CAP TABLE
EXHIBIT O      FORM OF TRANSFEROR REPRESENTATION LETTER FOR TRANSFER TO
              REGULATION S BOOK-ENTRY CERTIFICATE FROM A HOLDER OF A RULE 144A
              BOOK-ENTRY CERTIFICATE OR DEFINITIVE CERTIFICATE
EXHIBIT P      FORM OF TRANSFEROR REPRESENTATION LETTER FOR TRANSFER PURSUANT TO
              RULE 144A FROM A HOLDER OF A REGULATION S BOOK-ENTRY CERTIFICATE
              OR DEFINITIVE CERTIFICATE
EXHIBIT Q      FORM OF SWAP AGREEMENT
EXHIBIT R      FORM OF ASSESSMENT OF COMPLIANCE
EXHIBIT S      SERVICING CRITERIA TO BE ADDRESSED
EXHIBIT T      SARBANES-OXLEY CERTIFICATION
EXHIBIT U      FORM OF ITEM 1123 CERTIFICATION OF SERVICER
SCHEDULE X     FORM 8-K DISCLOSURE AND RESPONSIBLE PARTIES
SCHEDULE Y     FORM 10-D DISCLOSURE AND RESPONSIBLE PARTIES
SCHEDULE Z     FORM 10-K DISCLOSURE AND RESPONSIBLE PARTIES


                                       -v-
<PAGE>

     POOLING AND SERVICING AGREEMENT, dated as of August 1, 2006, among MERRILL
LYNCH MORTGAGE INVESTORS, INC., a Delaware corporation, as depositor (the
"Depositor"), WILSHIRE CREDIT CORPORATION, a Nevada corporation, as servicer
(the "Servicer"), and LASALLE BANK NATIONAL ASSOCIATION, a national banking
association, as trustee (the "Trustee").

     The Depositor is the owner of the Trust Fund that is hereby conveyed to the
Trustee in return for the Certificates. The Trust Fund for federal income tax
purposes will consist of (i) three real estate mortgage investment conduits,
(ii) the right to receive payments distributable to the Class P Certificates
pursuant to Section 4.04(b) hereof, (iii) the Cap Contract, (iv) the right to
receive payments in respect of Collectable Arrearages and P&I Arrearages, (v)
the grantor trusts described in Section 2.07 hereof and (vi) the Supplemental
Interest Trust, which in turn will hold the Swap Agreement. The SWAP REMIC will
consist of all of the assets constituting the Trust Fund (other than the assets
described in clauses (ii), (iii), (iv), (v), (vi) and (vii) above, other than
the SWAP REMIC Regular Interests and other than the Lower Tier REMIC Regular
Interests) and will be evidenced by the SWAP REMIC Regular Interests (which will
be uncertificated and will represent the "regular interests" in the SWAP REMIC)
and the Class SWR Interest as the single "residual interest" in the SWAP REMIC.
The Lower Tier REMIC will consist of the SWAP REMIC Regular Interests and will
be evidenced by the Lower Tier REMIC Regular Interests (which will be
uncertificated and will represent the "regular interests" in the Lower Tier
REMIC) and the Class LTR Interest as the single "residual interest" in the Lower
Tier REMIC. The Trustee will hold the Lower Tier REMIC Regular Interests. The
Upper Tier REMIC will consist of the Lower Tier REMIC Regular Interests and will
be evidenced by the REMIC Regular Interests (which will represent the "regular
interests" in the Upper Tier REMIC) and the Residual Interest as the single
"residual interest" in the Upper Tier REMIC. The Class R Certificate will
represent beneficial ownership of the Class SWR Interest, the Class LTR Interest
and the Residual Interest. The "latest possible maturity date" for federal
income tax purposes of all interests created hereby will be the Latest Possible
Maturity Date.

     All covenants and agreements made by the Sponsor in the Sale Agreement and
by the Depositor and the Trustee herein with respect to the Mortgage Loans and
the other property constituting the Trust Fund are for the benefit of the
Holders from time to time of the Certificates.

THE SWAP REMIC

The following table sets forth the designations, initial principal balances and
interest rates for each interest in the SWAP REMIC:

<TABLE>
<CAPTION>
Class     Initial Principal Balance    Interest Rate
-----     -------------------------    -------------
<S>       <C>                          <C>
SW-Z          $61,850,022.930               (1)
SW-1A         $ 3,304,251.500               (2)
SW-1B         $ 3,304,251.500               (3)
SW-2A         $ 3,117,339.500               (2)
SW-2B         $ 3,117,339.500               (3)
SW-3A         $ 2,940,990.500               (2)
SW-3B         $ 2,940,990.500               (3)
SW-4A         $ 2,755,793.500               (2)
SW-4B         $ 2,755,793.500               (3)
</TABLE>

<PAGE>

<TABLE>
<S>       <C>                          <C>
SW-5A         $ 2,605,532.500               (2)
SW-5B         $ 2,605,532.500               (3)
SW-6A         $ 2,449,580.000               (2)
SW-6B         $ 2,449,580.000               (3)
SW-7A         $ 2,307,911.000               (2)
SW-7B         $ 2,307,911.000               (3)
SW-8A         $ 2,224,034.000               (2)
SW-8B         $ 2,224,034.000               (3)
SW-9A         $ 2,065,624.000               (2)
SW-9B         $ 2,065,624.000               (3)
SW-10A        $ 1,948,899.500               (2)
SW-10B        $ 1,948,899.500               (3)
SW-11A        $ 1,830,237.000               (2)
SW-11B        $ 1,830,237.000               (3)
SW-12A        $ 1,720,791.000               (2)
SW-12B        $ 1,720,791.000               (3)
SW-13A        $ 1,623,165.500               (2)
SW-13B        $ 1,623,165.500               (3)
SW-14A        $ 1,532,228.500               (2)
SW-14B        $ 1,532,228.500               (3)
SW-15A        $ 1,441,988.500               (2)
SW-15B        $ 1,441,988.500                (3)
SW-16A        $ 1,357,045.500               (2)
SW-16B        $ 1,357,045.500               (3)
SW-17A        $ 1,276,707.000               (2)
SW-17B        $ 1,276,707.000               (3)
SW-18A        $ 1,198,091.500               (2)
SW-18B         $ 1,198,091.500               (3)
SW-19A        $ 1,124,466.500               (2)
SW-19B        $ 1,124,466.500               (3)
SW-20A        $ 1,057,759.000               (2)
SW-20B        $ 1,057,759.000               (3)
SW-21A        $ 1,027,948.500                (2)
SW-21B        $ 1,027,948.500               (3)
SW-22A        $    980,512.000               (2)
SW-22B        $    980,512.000               (3)
SW-23A        $    908,805.000               (2)
SW-23B        $    908,805.000               (3)
SW-24A        $     854,425.500               (2)
SW-24B        $    854,425.500               (3)
SW-25A        $    816,854.500               (2)
SW-25B        $    816,854.500               (3)
SW-26A        $    754,808.000               (2)
SW-26B        $    754,808.000               (3)
SW-27A        $    709,550.000               (2)
SW-27B        $    709,550.000               (3)
</TABLE>


                                       -2-

<PAGE>

<TABLE>
<S>       <C>                          <C>
SW-28A        $    678,708.500               (2)
SW-28B        $    678,708.500               (3)
SW-29A        $    625,889.500               (2)
SW-29B        $    625,889.500               (3)
SW-30A        $    587,611.000               (2)
SW-30B        $    587,611.000               (3)
SW-31A        $    563,802.000               (2)
SW-31B        $    563,802.000               (3)
SW-32A        $    517,535.000               (2)
SW-32B        $    517,535.000               (3)
SW-33A        $    485,241.000               (2)
SW-33B        $    485,241.000               (3)
SW-34A         $    467,214.500               (2)
SW-34B        $    467,214.500               (3)
SW-35A        $    426,121.000               (2)
SW-35B        $    426,121.000               (3)
SW-36A        $    399,019.500               (2)
SW-36B        $    399,019.500                (3)
SW-37A        $    385,767.000               (2)
SW-37B        $    385,767.000               (3)
SW-38A        $    349,445.000               (2)
SW-38B        $    349,445.000               (3)
SW-39A        $    351,399.500               (2)
SW-39B        $    351,399.500               (3)
SW-40A        $     77,777.500               (2)
SW-40B        $     77,777.500               (3)
SWR                          (4)            (4)
</TABLE>

(1)   The interest rate on the Class SW-Z Interest shall be a per annum rate
     equal to the Net WAC.

(2)   For any Distribution Date, the interest rate on each SWAP REMIC Regular
     Interest ending with the designation "A" shall be a per annum rate equal to
     2 times the Net WAC, subject to a maximum rate of 2 times the REMIC Swap
     Rate for such Distribution Date.

(3)   For any Distribution Date, the interest rate on each SWAP REMIC Regular
     Interest ending with the designation "B" shall be a per annum rate equal to
     the greater of (x) the excess, if any, of (i) 2 times the Net WAC over (ii)
     2 times the REMIC Swap Rate for such Distribution Date and (y) 0.00%.

(4)   The Class SWR Interest shall have no principal amount and shall bear no
     interest.


                                       -3-

<PAGE>

THE LOWER TIER REMIC

The following table sets forth the designations, initial principal balances,
interest rates and Classes of Corresponding Certificates for each interest in
the Lower Tier REMIC:

<TABLE>
<CAPTION>
                                                            Class(es) of
Class    Initial Principal Balance    Interest Rate    Corresponding Certificates
-----    -------------------------    -------------    --------------------------
<S>      <C>                          <C>              <C>
LTA                  (1)                    (3)                     A, R
LTM-1               (1)                    (3)                     M-1
LTM-2               (1)                    (3)                     M-2
LTM-3               (1)                    (3)                      M-3
LTB                 (1)                    (3)                      B
LTX                 (2)                    (3)                     N/A
LT-IO               (4)                    (4)                     N/A
LTR                 (5)                    (5)                      N/A
</TABLE>

(1)   The initial principal balance of each of these Lower Tier REMIC Regular
     Interests shall equal 1/2 of the initial Certificate Principal Balance of
     its Corresponding Certificates.

(2)   The initial principal balance of the Class LTX Interest shall equal the
     excess of (i) the aggregate Cut-off Date Principal Balance of the Mortgage
     Loans over (ii) the initial principal balance of the Lower Tier REMIC
     Marker Interests.

(3)   For each Distribution Date, the interest rate for each of the Lower Tier
     REMIC Regular Interests (other than the Class LT-IO Interest) shall be a
     per annum rate (but not less than zero) equal to the product of (i) the
     weighted average of the interest rates on the SWAP REMIC Regular Interests
     for such Distribution Date and (ii) a fraction the numerator of which is 30
     and the denominator of which is the actual number of days in the Accrual
     Period for the LIBOR Certificates, provided however, that for any
      Distribution Date on which the Class LT-IO Interest is entitled to a
     portion of interest accruals on a SWAP REMIC Regular Interest ending with a
     designation "A" as described in footnote 4 below, such weighted average
     shall be computed by first subjecting the rate on such SWAP REMIC Regular
     Interest to a cap equal to Swap LIBOR for such Distribution Date.

(4)   The Class LT-IO Interest is an interest-only class that does not have a
     principal balance. For only those Distribution Dates listed in the first
     column of the table below, the Class LT-IO Interest shall be entitled to
     interest accrued on the SWAP REMIC Regular Interest listed in the second
     column below at a per annum rate equal to the excess, if any, of (i) the
     interest rate for such SWAP REMIC Regular Interest for such Distribution
     Date over (ii) Swap LIBOR for such Distribution Date.

<TABLE>
<CAPTION>
Distribution Date    SWAP REMIC Regular Interest
-----------------    ---------------------------
<S>                  <C>
       7                     Class SW-1A
       7-8                   Class SW-2A
       7-9                   Class SW-3A
       7-10                  Class SW-4A
       7-11                  Class SW-5A
       7-12                  Class SW-6A
       7-13                  Class SW-7A
</TABLE>


                                       -4-

<PAGE>

<TABLE>
<S>                  <C>
       7-14                  Class SW-8A
       7-15                  Class SW-9A
       7-16                  Class SW-10A
       7-17                  Class SW-11A
       7-18                  Class SW-12A
       7-19                  Class SW-13A
       7-20                  Class SW-14A
       7-21                  Class SW-15A
       7-22                  Class SW-16A
        7-23                  Class SW-17A
       7-24                  Class SW-18A
       7-25                  Class SW-19A
       7-26                  Class SW-20A
       7-27                  Class SW-21A
       7-28                  Class SW-22A
       7-29                   Class SW-23A
       7-30                  Class SW-24A
       7-31                  Class SW-25A
       7-32                  Class SW-26A
       7-33                  Class SW-27A
       7-34                  Class SW-28A
       7-35                   Class SW-29A
       7-36                  Class SW-30A
       7-37                  Class SW-31A
       7-38                  Class SW-32A
       7-39                  Class SW-33A
       7-40                  Class SW-34A
       7-41                  Class SW-35A
       7-42                  Class SW-36A
       7-43                  Class SW-37A
       7-44                  Class SW-38A
       7-45                  Class SW-39A
       7-46                  Class SW-40A
</TABLE>

(5)   The Class LTR Interest shall have no principal amount and shall bear no
     interest.

UPPER TIER REMIC

The following table sets forth the designation, the initial principal balances,
the interest rates and Classes of Related Certificates for each of the interests
in the Upper Tier REMIC.

<TABLE>
<CAPTION>
                                  Initial Principal                 Class of
Class                                   Balance         Rate    Related Certificates
-----                              -----------------    ----    --------------------
<S>                                <C>                  <C>     <C>
UTA                                       (1)            (2)            A
UTM-1                                     (1)            (2)            M-1
UTM-2                                      (1)            (2)            M-2
UTM-3                                     (1)            (2)            M-3
UTB                                       (1)            (2)            B
</TABLE>


                                       -5-

<PAGE>

<TABLE>
<S>                                <C>                  <C>     <C>
Uncertificated Class C Interest           (3)            (3)            N/A
UT-IO                                     (4)            (4)            N/A
Residual Interest                         (1)             (2)            R
</TABLE>

(1)   The initial principal balance of each of these REMIC Regular Interests
     shall equal the initial principal balance of its Class of Related
     Certificates.

(2)   The interest rates on each of these REMIC Regular Interests and the
     Residual Interest shall be an annual rate equal to the Pass-Through Rate
     for the Class of Related Certificates, provided that in lieu of the
     applicable Available Funds Caps set forth in the definition of an
     applicable Pass-Through Rate, the applicable Upper Tier REMIC Net WAC Cap
     shall be used.

(3)   The Uncertificated Class C Interest shall have an initial principal balance
     equal to the initial Overcollateralization Amount. The Uncertificated Class
     C Interest shall accrue interest on a notional balance set forth in the
     definition of Class C Current Interest at a rate equal to the Class C
     Distributable Interest Rate. The Uncertificated Class C Interest shall be
     represented by the Class C Certificates.

(4)   The Class UT-IO Interest shall have no principal amount and will not have
     an interest rate, but will be entitled to 100% of the interest accrued with
     respect to the Class LT-IO Interest. The Class UT-IO Interest shall be
     represented by the Class C Certificates.

THE CERTIFICATES

The following table sets forth the Class designation, interest rate and initial
Class principal amount for each Class of Certificates comprising interests in
the Trust Fund.

<TABLE>
<CAPTION>
           Initial Class
Class    Principal Amount    Interest Rate
-----    ----------------    -------------
<S>      <C>                 <C>
A               (1)               (2)
M-1             (1)               (2)
M-2             (1)               (2)
M-3             (1)               (2)
B               (1)               (2)
C               (3)               (3)
P               (4)               (4)
R               (1)              (2)(5)
</TABLE>

(1)   Each of these Classes of Certificates shall have initial principal balances
      as set forth in Section 5.01 hereof.

(2)   Each of these Classes of Certificates shall bear interest at a per annum
     rate equal to the Pass-Through Rate for such Certificates set forth in the
     definitions herein.

(3)   For federal income tax purposes, the Class C Certificate shall represent
     (i) the right to receive all distributions with respect to the REMIC
     Regular Interests represented by the Uncertificated Class C Interest and
     the Class UT-IO Interest and (ii) certain rights and obligations with
     respect to notional principal contracts and P&I Arrearages as described in
     Section 2.07.

(4)   The Class P Certificates shall be entitled to the amounts distributable
     pursuant to Section 4.04(b) hereof and shall not represent a REMIC regular
     interest.


                                       -6-

<PAGE>

(5)   The Class R Interest represents ownership of the Class SWR Interest, the
     Class LTR Interest and the Residual Interest.

     In consideration of the mutual agreements herein contained, the Depositor,
the Servicer and the Trustee hereby agree as follows:

                                   ARTICLE I

                                   DEFINITIONS

     Whenever used in this Agreement, the following words and phrases, unless
the context otherwise requires, shall have the following meanings:

     Accepted Servicing Practices: The Servicer's normal servicing practices,
which will conform to the mortgage servicing practices of prudent mortgage
lending institutions that service for their own account mortgage loans of the
same type as the Mortgage Loans in the jurisdictions in which the related
Mortgaged Properties are located.

     Accountant's Attestation: As defined in Section 3.18.

     Accrual Period: With respect to each Class of LIBOR Certificates, their
Corresponding REMIC Regular Interests and the Lower Tier REMIC Interests and any
Distribution Date, the period commencing on the immediately preceding
Distribution Date (or, in the case of the first Distribution Date, the Closing
Date) and ending on the day immediately preceding such Distribution Date. With
respect to the Class B Certificates, their Corresponding REMIC Regular Interest
and the SWAP REMIC Regular Interests and any Distribution Date, the calendar
month immediately preceding the month in which such Distribution Date occurs.
All calculations of interest on each Class of LIBOR Certificates, their
Corresponding REMIC Regular Interests and the Lower Tier REMIC Interests will be
made on the basis of the actual number of days elapsed in the related Accrual
Period and a 360 day year. All calculations of interest on the Class B
Certificates, their Corresponding REMIC Regular Interest and the SWAP REMIC
Regular Interests will be made on the basis of a 360 day year consisting of
twelve 30 day months.

     Additional Form 10-D Disclosure: Has the meaning set forth in Section 3.20.

     Adjustable Rate Mortgage Loan: A Mortgage Loan identified in the Mortgage
Loan Schedule as having a Mortgage Rate that is adjustable.

     Adjustment Date: As to each Adjustable Rate Mortgage Loan, each date on
which the related Mortgage Rate is subject to adjustment, as provided in the
related Mortgage Note.

     Advance: The aggregate of the advances required to be made by the Servicer
with respect to any Distribution Date pursuant to Section 4.01, the amount of
any such advances being equal to the sum of the aggregate amount of all payments
of principal and interest (or, with respect to interest-only Mortgage Loans,
payments of scheduled interest) (net of the Servicing Fee) on the Mortgage Loans
that were due during the applicable Due Period and not received as of the close
of business on the related Determination Date, except as provided in Section
4.01 hereof, less the aggregate amount of any such Delinquent payments that the
Servicer has determined would constitute a Non-Recoverable Advance were an
advance to be made with respect thereto; provided, however, that with respect to
(i) any Mortgage Loan which is not a first lien Mortgage Loan that is 150 days
delinquent or more (whether or not the Mortgage


                                       -7-

<PAGE>

Loan has been converted to an REO Property) and (ii) any shortfalls due to
bankruptcy proceedings or the application of the Relief Act or similar state
legislation or regulation, there will be no obligation to make advances and,
provided further, however, that with respect to any Mortgage Loan that has been
converted to an REO Property which is less than 150 days delinquent, the
obligation to make Advances shall only be to payments of interest (subject to
the exceptions described above and net of the related Servicing Fees), to be
calculated after taking into account rental income.

     Advance Facility: A financing or other facility as described in Section
10.07.

     Advancing Person: A Person to whom the Servicer's rights under this
Agreement to be reimbursed for any Advances or Servicing Advances have been
assigned pursuant to Section 10.07.

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

     Aggregate Certificate Principal Balance: For any date of determination, the
sum of the Class A Certificate Principal Balance, the Class R Certificate
Principal Balance, the Class M-1 Certificate Principal Balance, the Class M-2
Certificate Principal Balance, the Class M-3 Certificate Principal Balance and
the Class B Certificate Principal Balance, in each case as of such date of
determination.

     Agreement: This Pooling and Servicing Agreement and any and all amendments
or supplements hereto made in accordance with the terms herein.

     Applied Realized Loss Amount: With respect to any Distribution Date, the
amount, if any, by which the sum of (i) the Aggregate Certificate Principal
Balance and (ii) the Class C Certificate Principal Balance after distributions
of principal on such Distribution Date exceeds the aggregate Stated Principal
Balance of the Mortgage Loans as of such Distribution Date.

     Appraised Value: With respect to a Mortgage Loan the proceeds of which were
used to purchase the related Mortgaged Property, the "Appraised Value" of a
Mortgaged Property is the lesser of (1) the appraised value based on an
appraisal made for the Sponsor by an independent fee appraiser at the time of
the origination of the related Mortgage Loan, and (2) the sales price of such
Mortgaged Property at such time of origination. With respect to a Mortgage Loan
the proceeds of which were used to refinance an existing mortgage loan, the
"Appraised Value" is the appraised value of the Mortgaged Property based upon
the appraisal obtained at the time of refinancing.

     Arrearage Realization Date: With respect to any Mortgage Loan that is
Delinquent 31 days or greater as of the Cut-off Date, the earlier of (i) the
date upon which such Mortgage Loan becomes current or (ii) the liquidation of
such Mortgage Loan.

     Arrearages: P&I Arrearages and Servicing Arrearages. For the avoidance of
doubt, amounts collected from any Mortgagor shall be applied to principal and
interest prior to being applied to Servicing Arrearages, amounts collected in
respect of P&I Arrearages shall be paid to the Trust Fund and amounts collected
in respect of Servicing Arrearages shall be paid to the Depositor by the
Servicer.


                                       -8-
<PAGE>

     Assessment of Compliance: As defined in Section 3.18.

     Assignment of Mortgage: An assignment of the Mortgage, notice of transfer
or equivalent instrument, in recordable form, sufficient under the laws of the
jurisdiction where the related Mortgaged Property is located to reflect of
record the sale and assignment of the Mortgage Loan to the Trustee, which
assignment, notice of transfer or equivalent instrument may, if permitted by
law, be in the form of one or more blanket assignments covering Mortgages
secured by Mortgaged Properties located in the same county.

     Auction: The one-time auction conducted by the Trustee, as described in
Section 9.01(b) hereof.

     Auction Date: The date on which the Auction occurs.

     Authenticating Agent: As defined in Section 5.10.

     Available Funds Cap: With respect to a Distribution Date, the per annum
rate equal to the product of (i) 12, (ii) the quotient of (x) the total
scheduled interest on the Mortgage Loans based on the Net Mortgages Rates in
effect on the related Due Date, less any Net Swap Payments or Swap Termination
Payments (other than Defaulted Swap Termination Payments) owed to the Swap
Counterparty for such Distribution Date, and (y) the aggregate Stated Principal
Balance of the Mortgage Loans as of the immediately preceding Distribution Date
(or, in the case of the first Distribution Date, as of the Cut-off Date), and
(iii) only with respect to the Class A, Class R and Class M Certificates, a
fraction, the numerator of which is 30 and the denominator of which is the
actual number of days in the related Accrual Period.

     Balloon Loan: A Mortgage Loan having an original term to stated maturity of
approximately 15 or 30 years which provides for level monthly payments of
principal and interest based on a 30- or 40-year amortization schedule, with a
balloon payment of the remaining outstanding principal balance due on such
Mortgage Loan at its stated maturity.

     Book-Entry Certificates: Any of the Certificates that shall be registered
in the name of the Depository or its nominee, the ownership of which is
reflected on the books of the Depository or on the books of a Person maintaining
an account with the Depository (directly, as a "Depository Participant", or
indirectly, as an indirect participant in accordance with the rules of the
Depository and as described in Section 5.06). As of the Closing Date, each of
the Offered Certificates constitutes a Class of Book-Entry Certificates.

     Business Day: Any day other than (1) a Saturday or a Sunday, or (2) a day
on which banking institutions in the State of Oregon, State of Illinois or in
the City of New York, New York are authorized or obligated by law or executive
order to be closed.

     Cap Contract: The confirmation and agreement between the Trustee on behalf
of the Supplemental Interest Trust and the Cap Contract Counterparty (in the
form of Exhibit M hereto).

     Cap Contract Counterparty: Bear Stearns Financial Products Inc.


                                      -9-

<PAGE>

     Cap Contract Notional Balance: With respect to any Distribution Date, the
Cap Contract Notional Balance set forth for such Distribution Date in the
One-Month LIBOR Cap Table attached hereto as Exhibit N.

     Cap Contract Termination Date: The Distribution Date following the
Distribution Date in February 2007.

     Certificate: Any one of the certificates of any Class executed by the
Trustee and authenticated by the Authenticating Agent in substantially the forms
attached hereto as Exhibit A.

     Certificate Account: The separate Eligible Account created and maintained
by the Trustee pursuant to Section 3.05(e) in the name of the Trustee for the
benefit of the Certificateholders and designated "LaSalle Bank National
Association, as trustee, in trust for registered holders of Merrill Lynch
Mortgage Investors Trust, Mortgage Loan Asset-Backed Certificates, Series
2006-SD1." Funds in the Certificate Account shall be held in trust for the
Certificateholders for the uses and purposes set forth in this Agreement.

     Certificate Owner: With respect to a Book-Entry Certificate, the Person
that is the beneficial owner of such Book-Entry Certificate.

     Certificate Principal Balance: As to any Certificate and as of any
Distribution Date, the Initial Certificate Principal Balance of such Certificate
less the sum of (1) all amounts distributed with respect to such Certificate in
reduction of the Certificate Principal Balance thereof on previous Distribution
Dates pursuant to Section 4.04, and (2) any Applied Realized Loss Amounts
allocated to such Certificate on previous Distribution Dates pursuant to Section
4.04(i). On each Distribution Date, after all distributions of principal on such
Distribution Date, a portion of the Class C Interest Carry Forward Amount in an
amount equal to the excess of the Overcollateralization Amount on such
Distribution Date over the Overcollateralization Amount as of the preceding
Distribution Date (or, in the case of the first Distribution Date, the initial
Overcollateralization Amount (based on the Stated Principal Balance of the
Mortgage Loans as of the Cut-off Date)) will be added to the aggregate
Certificate Principal Balance of the Class C Certificates (on a pro rata basis).
Notwithstanding the immediately preceding sentence, however, to the extent any
excess referred to in the immediately preceding sentence is attributable to
distributions of P&I Arrearages or proceeds of the Swap Agreement, such sentence
shall be applied by substituting "Class C Unpaid Realized Loss Amount" for
"Class C Interest Carry Forward Amount". Notwithstanding the foregoing on any
Distribution Date relating to a Due Period in which a Subsequent Recovery has
been received by the Servicer, the Certificate Principal Balance of any Class of
Certificates then outstanding for which any Applied Realized Loss Amount has
been allocated will be increased, in order of seniority, by an amount equal to
the lesser of (i) the Unpaid Realized Loss Amount for such Class of Certificates
and (ii) the total of any Subsequent Recovery distributed on such date to the
Certificateholders (reduced by the amount of the increase in the Certificate
Principal Balance of any more senior Class of Certificates pursuant to this
sentence on such Distribution Date).

     Certificate Register: The register maintained pursuant to Section 5.02
hereof.

     Certificateholder or Holder: The Person in whose name a Certificate is
registered in the Certificate Register (initially, Cede & Co., as nominee for
the Depository) in the case of any Class of Regular Certificates or the Class R
Certificate, except that solely for the purpose of giving any consent pursuant
to this Agreement, any Certificate registered in the name of the Depositor or
any Affiliate of the


                                      -10-

<PAGE>

Depositor shall be deemed not to be Outstanding and the Percentage Interest
evidenced thereby shall not be taken into account in determining whether the
requisite amount of Percentage Interests necessary to effect such consent has
been obtained; provided, however, that if any such Person (including the
Depositor) owns 100% of the Percentage Interests evidenced by a Class of
Certificates, such Certificates shall be deemed to be Outstanding for purposes
of any provision hereof that requires the consent of the Holders of Certificates
of a particular Class as a condition to the taking of any action hereunder. The
Trustee is entitled to rely conclusively on a certification of the Depositor or
any Affiliate of the Depositor in determining which Certificates are registered
in the name of an Affiliate of the Depositor.

     Class: All Certificates bearing the same Class designation as set forth in
Section 5.01 hereof.

     Class A Certificates: Any Certificate designated as "Class A Certificate"
on the face thereof in the form of Exhibit A hereto, representing the right to
distributions as set forth herein.

      Class A Certificate Principal Balance: As of any date of determination, the
aggregate Certificate Principal Balance of the Class A Certificates.

     Class A Current Interest: As of any Distribution Date, the interest accrued
during the related Accrual Period at the Class A Pass-Through Rate on the Class
A Certificate Principal Balance as of such Distribution Date plus the portion of
any previous distributions on such Class in respect of Current Interest or a
Class A Interest Carry Forward Amount that is recovered as a voidable preference
by a trustee in bankruptcy, less any Non-Supported Interest Shortfall allocated
on such Distribution Date to the Class A Certificates.

     Class A Interest Carry Forward Amount: As of any Distribution Date, the sum
of (1) the excess of (A) the Class A Current Interest with respect to prior
Distribution Dates over (B) the amount actually distributed to the Class A
Certificates with respect to interest on such prior Distribution Dates and (2)
interest on such excess (to the extent permitted by applicable law) at the Class
A Pass-Through Rate for the related Accrual Period.

     Class A Margin: As of any Distribution Date up to and including the Initial
Optional Termination Date, 0.2800% per annum and, as of any Distribution Date
after the Initial Optional Termination Date, 0.5600% per annum.

     Class A Pass-Through Rate: For the first Distribution Date, 5.6100% per
annum. As of any Distribution Date thereafter, the least of (1) One-Month LIBOR
plus the Class A Margin, (2) the Available Funds Cap for such Distribution Date
and (3) the Maximum Rate Cap for such Distribution Date.

     Class A Principal Distribution Amount: With respect to any Distribution
Date (1) prior to the related Stepdown Date or any Distribution Date on which a
Stepdown Trigger Event exists, 100% of the Principal Distribution Amount for
such Distribution Date and (2) on or after the Stepdown Date where a Stepdown
Trigger Event does not exist, the excess of (A) the sum of the Class A
Certificate Principal Balance and the Class R Certificate Principal Balance
immediately prior to such Distribution Date over (B) the lesser of (i) 30.20% of
the aggregate Stated Principal Balance of the Mortgage Loans as of such
Distribution Date and (ii) the excess of the aggregate Stated Principal Balance
of the Mortgage Loans as of such Distribution Date over the Minimum Required
Overcollateralization Amount; provided, however,


                                      -11-

<PAGE>

that in no event will the Class A Principal Distribution Amount with respect to
any Distribution Date exceed the aggregate Certificate Principal Balance of the
Class A and Class R Certificates.

     Class B Applied Realized Loss Amount: As of any Distribution Date, the sum
of all Applied Realized Loss Amounts with respect to the Mortgage Loans which
have been applied to the reduction of the Certificate Principal Balance of the
Class B Certificates.

     Class B Certificate: Any Certificate designated as "Class B Certificate" on
the face thereof in the form of Exhibit A hereto, representing the right to
distributions as set forth herein.

     Class B Certificate Principal Balance: As of any date of determination, the
aggregate Certificate Principal Balance of the Class B Certificates.

     Class B Current Interest: As of any Distribution Date, the interest accrued
during the related Accrual Period at the Class B Pass-Through Rate on the Class
B Certificate Principal Balance as of such Distribution Date plus the portion of
any previous distributions on such Class in respect of Current Interest or Class
B Interest Carry Forward Amount that is recovered as a voidable preference by a
trustee in bankruptcy, less any Non-Supported Interest Shortfall allocated on
such Distribution Date to the Class B Certificates.

     Class B Interest Carry Forward Amount: As of any Distribution Date, the sum
of (1) the excess of (A) the Class B Current Interest with respect to prior
Distribution Dates over (B) the amount actually distributed to the Class B
Certificates with respect to interest on such prior Distribution Dates and (2)
interest on such excess (to the extent permitted by applicable law) at the Class
B Pass-Through Rate for the related Accrual Period.

     Class B Pass-Through Rate: For any Distribution Date up to and including
the Initial Optional Termination Date, the least of (1) 7.0000% per annum, (2)
the Available Funds Cap for such Distribution Date and (3) the Maximum Rate Cap
for such Distribution Date; and for any Distribution Date after the Initial
Optional Termination Date, the least of (1) 7.5000% per annum, (2) the Available
Funds Cap for such Distribution Date and (3) the Maximum Rate Cap for such
Distribution Date.

     Class B Principal Distribution Amount: With respect to any Distribution
Date on or after the Stepdown Date, 100% of the Principal Distribution Amount
for such Distribution Date if the Class A Certificate Principal Balance, the
Class R Certificate Principal Balance and the Class M Certificate Principal
Balance have been reduced to zero and a Stepdown Trigger Event exists, or as
long as a Stepdown Trigger Event does not exist, the excess of (1) the sum of
(A) the sum of the Class A Certificate Principal Balance and the Class R
Certificate Principal Balance (after taking into account distributions of the
Class A Principal Distribution Amount on such Distribution Date), (B) the Class
M-1 Certificate Principal Balance (after taking into account distributions of
the Class M-1 Principal Distribution Amount on such Distribution Date), (C) the
Class M-2 Certificate Principal Balance (after taking into account distributions
of the Class M-2 Principal Distribution Amount on such Distribution Date), (D)
the Class M-3 Certificate Principal Balance (after taking into account
distributions of the Class M-3 Principal Distribution Amount on such
Distribution Date) and (E) the Class B Certificate Principal Balance immediately
prior to such Distribution Date over (2) the lesser of (A) 86.60% of the Stated
Principal Balance of the Mortgage Loans as of such Distribution Date and (B) the
excess of the Stated Principal Balance of the Mortgage Loans as of such
Distribution Date over the Minimum Required Overcollateralization Amount.
Notwithstanding the foregoing, (I) on any Distribution Date prior to the


                                      -12-

<PAGE>

Stepdown Date on which the Certificate Principal Balance of each Class of Class
A, Class R and Class M Certificates has been reduced to zero, the Class B
Principal Distribution Amount will equal the lesser of (x) the outstanding
Certificate Principal Balance of the Class B Certificates and (y) 100% of the
Principal Distribution Amount remaining after any distributions on such Class A,
Class R and Class M Certificates and (II) in no event will the Class B Principal
Distribution Amount with respect to any Distribution Date exceed the Class B
Certificate Principal Balance.

     Class B Unpaid Realized Loss Amount: As of any Distribution Date, the
excess of (1) the Class B Applied Realized Loss Amount over (2) the sum of (x)
all distributions in reduction of the Class B Unpaid Realized Loss Amounts on
all previous Distribution Dates and (y) all increases in the Certificate
Principal Balance of the Class B Certificates pursuant to the last sentence of
the definition of "Certificate Principal Balance."

     Class C Applied Realized Loss Amount: As of any Distribution Date, the sum
of all Applied Realized Loss Amounts with respect to the Mortgage Loans which
have been applied to the reduction of the Certificate Principal Balance of the
Class C Certificates.

     Class C Certificate: Any Certificate designated as a "Class C Certificate"
on the face thereof, in the form of Exhibit A hereto, representing the right to
distributions as set forth herein.

     Class C Certificate Principal Balance: As of any date of determination, the
aggregate Certificate Principal Balance of the Class C Certificates.

     Class C Current Interest: As of any Distribution Date, the interest accrued
during the related Accrual Period at the Class C Distributable Interest Rate on
a notional amount equal to the aggregate principal balance of the Lower Tier
REMIC Regular Interests immediately prior to such Distribution Date, plus the
interest portion of any previous distributions on such Class that is recovered
as a voidable preference by a trustee in bankruptcy, less any Non-Supported
Interest Shortfall allocated on such Distribution Date to the Class C
Certificates.

     Class C Distributable Interest Rate: The excess, if any, of (a) the
weighted average of the interest rates on the Lower Tier REMIC Regular Interests
(other than the Class LT-IO Interest) over (b) two times the weighted average of
the interest rates on the Lower Tier REMIC Regular Interests (other than the
Class LT-IO Interest) (treating for purposes of this clause (b) the interest
rate on each of the Lower Tier REMIC Marker Interests as being capped at the
interest rate of the Corresponding REMIC Regular Interest of the Corresponding
Certificates (as adjusted, if necessary, to reflect the length of the Accrual
Period for the LIBOR Certificates) and treating the Class LTX Interest as being
capped at zero). The averages described in the preceding sentence shall be
weighted on the basis of the respective principal balances of the Lower Tier
REMIC Regular Interests immediately prior to any date of determination.

     Class C Interest Carry Forward Amount: As of any Distribution Date, the
excess of (A) the Class C Current Interest with respect to prior Distribution
Dates over (B) the amount actually distributed to the Class C Certificates with
respect to interest on such prior Distribution Dates or added to the aggregate
Certificate Principal Balance of the Class C Certificates (other than amounts so
added attributable to Subsequent Recoveries, proceeds of the Swap Agreement or
P&I Arrearages).

     Class C Unpaid Realized Loss Amount: As of any Distribution Date, the
excess of (1) the Class C Applied Realized Loss Amount over (2) the sum of (x)
all distributions in reduction of the Class C


                                      -13-

<PAGE>

Unpaid Realized Loss Amounts on all previous Distribution Dates and (y) all
increases in the Certificate Principal Balance of such Class C Certificates (A)
pursuant to the last sentence of the definition of "Certificate Principal
Balance" or (B) attributable to distributions of P&I Arrearages or proceeds of
the Swap Agreement.

     Class LTA Interest: An uncertificated regular interest in the Lower Tier
REMIC with an initial principal balance equal to 1/2 of the initial principal
balance of its Corresponding Certificates and an interest rate equal to the Net
Rate.

     Class LTB Interest: An uncertificated regular interest in the Lower Tier
REMIC with an initial principal balance equal to 1/2 of the initial principal
balance of its Corresponding Certificate and an interest rate equal to the Net
Rate.

     Class LT-IO Interest: An uncertificated regular interest in the Lower Tier
REMIC with the characteristics set forth in the description of the Lower Tier
REMIC in the Preliminary Statement.

     Class LTM-1 Interest: An uncertificated regular interest in the Lower Tier
REMIC with an initial principal balance equal to 1/2 of the initial principal
balance of its Corresponding Certificate and an interest rate equal to the Net
Rate.

     Class LTM-2 Interest: An uncertificated regular interest in the Lower Tier
REMIC with an initial principal balance equal to 1/2 of the initial principal
balance of its Corresponding Certificate and an interest rate equal to the Net
Rate.

     Class LTM-3 Interest: An uncertificated regular interest in the Lower Tier
REMIC with an initial principal balance equal to 1/2 of the initial principal
balance of its Corresponding Certificate and an interest rate equal to the Net
Rate.

     Class LTX Interest: An uncertificated regular interest in the Lower Tier
REMIC with an initial principal balance equal to the excess of (i) the aggregate
Cut-off Date Principal Balance of the Mortgage Loans over (ii) the aggregate
initial principal balance of the Lower Tier REMIC Marker Interests and an
interest rate equal to the Net Rate.

     Class LTR Interest: The sole class of "residual interest" in the Lower Tier
REMIC.

     Class M Certificates: Any of the Class M-1, Class M-2 or Class M-3
Certificates.

     Class M Certificate Principal Balance: For any date of determination, the
sum of the Class M-1 Certificate Principal Balance, Class M-2 Certificate
Principal Balance and Class M-3 Certificate Principal Balance.

     Class M-1 Applied Realized Loss Amount: As of any Distribution Date, the
sum of all Applied Realized Loss Amounts with respect to the Mortgage Loans
which have been applied to the reduction of the Certificate Principal Balance of
the Class M-1 Certificates.

      Class M-1 Certificate: Any Certificate designated as a "Class M-1
Certificate" on the face thereof, in the form of Exhibit A hereto, representing
the right to distributions as set forth herein.


                                      -14-

<PAGE>

     Class M-1 Certificate Principal Balance: As of any date of determination,
the aggregate Certificate Principal Balance of the Class M-1 Certificates.

     Class M-1 Current Interest: As of any Distribution Date, the interest
accrued during the related Accrual Period at the Class M-1 Pass-Through Rate on
the Class M-1 Certificate Principal Balance as of such Distribution Date plus
the portion of any previous distributions on such Class in respect of Current
Interest or Class M-1 Interest Carry Forward Amount that is recovered as a
voidable preference by a trustee in bankruptcy, less any Non-Supported Interest
Shortfall allocated on such Distribution Date to the Class M-1 Certificates.

     Class M-1 Interest Carry Forward Amount: As of any Distribution Date, the
sum of (1) the excess of (A) the Class M-1 Current Interest with respect to
prior Distribution Dates over (B) the amount actually distributed to the Class
M-1 Certificates with respect to interest on such prior Distribution Dates and
(2) interest on such excess (to the extent permitted by applicable law) at the
Class M-1 Pass-Through Rate for the related Accrual Period.

     Class M-1 Margin: As of any Distribution Date up to and including the
Initial Optional Termination Date, 0.4500% per annum and, as of any Distribution
Date after the Initial Optional Termination Date, 0.6750% per annum.

     Class M-1 Pass-Through Rate: For the first Distribution Date, 5.7800% per
annum. As of any Distribution Date thereafter, the least of (1) One-Month LIBOR
plus the Class M-1 Margin, (2) the Available Funds Cap for such Distribution
Date and (3) the Maximum Rate Cap for such Distribution Date.

     Class M-1 Principal Distribution Amount: With respect to any Distribution
Date on or after the Stepdown Date, 100% of the Principal Distribution Amount
for such Distribution Date if the Class A Certificate Principal Balance and the
Class R Certificate Principal Balance have been reduced to zero and a Stepdown
Trigger Event exists, or as long as a Stepdown Trigger Event does not exist, the
excess of (1) the sum of (A) the sum of the Class A Certificate Principal
Balance and the Class R Certificate Principal Balance (after taking into account
distributions of the Class A Principal Distribution Amount on such Distribution
Date) and (B) the Class M-1 Certificate Principal Balance immediately prior to
such Distribution Date over (2) the lesser of (A) 47.60% of the Stated Principal
Balances of the Mortgage Loans as of such Distribution Date and (B) the excess
of the Stated Principal Balances for the Mortgage Loans as of such Distribution
Date over the Minimum Required Overcollateralization Amount. Notwithstanding the
foregoing, (I) on any Distribution Date prior to the Stepdown Date on which the
Certificate Principal Balance of each of the Class A and Class R Certificates
has been reduced to zero, the Class M-1 Principal Distribution Amount will equal
the lesser of (x) the outstanding Certificate Principal Balance of the Class M-1
Certificates and (y) 100% of the Principal Distribution Amount remaining after
any distributions on such Class A and Class R Certificates and (II) in no event
will the Class M-1 Principal Distribution Amount with respect to any
Distribution Date exceed the Class M-1 Certificate Principal Balance.

     Class M-1 Unpaid Realized Loss Amount: As of any Distribution Date, the
excess of (1) the Class M-1 Applied Realized Loss Amount over (2) the sum of (x)
all distributions in reduction of the Class M-1 Unpaid Realized Loss Amounts on
all previous Distribution Dates and (y) all increases in the Certificate
Principal Balance of such Class M-1 Certificates pursuant to the last sentence
of the definition of "Certificate Principal Balance."


                                      -15-

<PAGE>

     Class M-2 Applied Realized Loss Amount: As of any Distribution Date, the
sum of all Applied Realized Loss Amounts with respect to the Mortgage Loans
which have been applied to the reduction of the Certificate Principal Balance of
the Class M-2 Certificates.

     Class M-2 Certificate: Any Certificate designated as a "Class M-2
Certificate" on the face thereof, in the form of Exhibit A hereto, representing
the right to distributions as set forth herein.

     Class M-2 Certificate Principal Balance: As of any date of determination,
the aggregate Certificate Principal Balance of the Class M-2 Certificates.

     Class M-2 Current Interest: As of any Distribution Date, the interest
accrued during the related Accrual Period at the Class M-2 Pass-Through Rate on
the Class M-2 Certificate Principal Balance as of such Distribution Date plus
the portion of any previous distributions on such Class in respect of Current
Interest or Class M-2 Interest Carry Forward Amount that is recovered as a
voidable preference by a trustee in bankruptcy, less any Non-Supported Interest
Shortfall allocated on such Distribution Date to the Class M-2 Certificates.

     Class M-2 Interest Carry Forward Amount: As of any Distribution Date, the
sum of (1) the excess of (A) the Class M-2 Current Interest with respect to
prior Distribution Dates over (B) the amount actually distributed to the Class
M-2 Certificates with respect to interest on such prior Distribution Dates and
(2) interest on such excess (to the extent permitted by applicable law) at the
Class M-2 Pass-Through Rate for the related Accrual Period.

     Class M-2 Margin: As of any Distribution Date up to and including the
Initial Optional Termination Date, 0.7000% per annum and, as of any Distribution
Date after the Initial Optional Termination Date, 1.0500% per annum.

     Class M-2 Pass-Through Rate: For the first Distribution Date, 6.0300% per
annum. As of any Distribution Date thereafter, the least of (1) One-Month LIBOR
plus the Class M-2 Margin, (2) the Available Funds Cap for such Distribution
Date and (3) the Maximum Rate Cap for such Distribution Date.

     Class M-2 Principal Distribution Amount: With respect to any Distribution
Date on or after the Stepdown Date, 100% of the Principal Distribution Amount
for such Distribution Date if the Class A Certificate Principal Balance, the
Class R Certificate Principal Balance and the Class M-1 Certificate Principal
Balance have been reduced to zero and a Stepdown Trigger Event exists, or as
long as a Stepdown Trigger Event does not exist, the excess of (1) the sum of
(A) the sum of the Class A Certificate Principal Balance and the Class R
Certificate Principal Balance (after taking into account distributions of the
Class A Principal Distribution Amount on such Distribution Date), (B) the Class
M-1 Certificate Principal Balance (after taking into account distributions of
the Class M-1 Principal Distribution Amount on such Distribution Date) and (C)
the Class M-2 Certificate Principal Balance immediately prior to such
Distribution Date over (2) the lesser of (A) 66.40% of the Stated Principal
Balances of the Mortgage Loans as of such Distribution Date and (B) the excess
of the Stated Principal Balances of the Mortgage Loans as of such Distribution
Date over the Minimum Required Overcollateralization Amount. Notwithstanding the
foregoing, (I) on any Distribution Date prior to the Stepdown Date on which the
Certificate Principal Balance of each Class of Class A, Class R and Class M-1
Certificates has been reduced to zero, the Class M-2 Principal Distribution
Amount will equal the lesser of (x) the outstanding Certificate Principal
Balance of the Class M-2 Certificates and (y) 100% of


                                      -16-

<PAGE>

the Principal Distribution Amount remaining after any distributions on such
Class A, Class R and Class M-1 Certificates and (II) in no event will the Class
M-2 Principal Distribution Amount with respect to any Distribution Date exceed
the Class M-2 Certificate Principal Balance.

     Class M-2 Unpaid Realized Loss Amount: As of any Distribution Date, the
excess of (1) the Class M-2 Applied Realized Loss Amount over (2) the sum of (x)
all distributions in reduction of the Class M-2 Unpaid Realized Loss Amounts on
all previous Distribution Dates and (y) all increases in the Certificate
Principal Balance of such Class M-2 Certificates pursuant to the last sentence
of the definition of "Certificate Principal Balance."

     Class M-3 Applied Realized Loss Amount: As of any Distribution Date, the
sum of all Applied Realized Loss Amounts with respect to the Mortgage Loans
which have been applied to the reduction of the Certificate Principal Balance of
the Class M-3 Certificates.

     Class M-3 Certificate: Any Certificate designated as a "Class M-3
Certificate" on the face thereof, in the form of Exhibit A hereto, representing
the right to distributions as set forth herein.

     Class M-3 Certificate Principal Balance: As of any date of determination,
the aggregate Certificate Principal Balance of the Class M-3 Certificates.

     Class M-3 Current Interest: As of any Distribution Date, the interest
accrued during the related Accrual Period at the Class M-3 Pass-Through Rate on
the Class M-3 Certificate Principal Balance as of such Distribution Date plus
the portion of any previous distributions on such Class in respect of Current
Interest or Class M-3 Interest Carry Forward Amount that is recovered as a
voidable preference by a trustee in bankruptcy, less any Non-Supported Interest
Shortfall allocated on such Distribution Date to the Class M-3 Certificates.

     Class M-3 Interest Carry Forward Amount: As of any Distribution Date, the
sum of (1) the excess of (A) the Class M-3 Current Interest with respect to
prior Distribution Dates over (B) the amount actually distributed to the Class
M-3 Certificates with respect to interest on such prior Distribution Dates and
(2) interest on such excess (to the extent permitted by applicable law) at the
Class M-3 Pass-Through Rate for the related Accrual Period.

     Class M-3 Margin: As of any Distribution Date up to and including the
Initial Optional Termination Date, 1.9500% per annum and, as of any Distribution
Date after the Initial Optional Termination Date, 2.9250% per annum.

     Class M-3 Pass-Through Rate: For the first Distribution Date, 7.2800% per
annum. As of any Distribution Date thereafter, the least of (1) One-Month LIBOR
plus the Class M-3 Margin, (2) the Available Funds Cap for such Distribution
Date and (3) the Maximum Rate Cap for such Distribution Date.

     Class M-3 Principal Distribution Amount: With respect to any Distribution
Date on or after the Stepdown Date, 100% of the Principal Distribution Amount
for such Distribution Date if the Class A Certificate Principal Balance, Class R
Certificate Principal Balance, Class M-1 Certificate Principal Balance and Class
M-2 Certificate Principal Balance have been reduced to zero and a Stepdown
Trigger Event exists, or as long as a Stepdown Trigger Event does not exist, the
excess of (1) the sum of (A) the sum of the Class A Certificate Principal
Balance and the Class R Certificate Principal Balance (after


                                      -17-

<PAGE>

taking into account distributions of the Class A Principal Distribution Amount
on such Distribution Date), (B) the Class M-1 Certificate Principal Balance
(after taking into account distributions of the Class M-1 Principal Distribution
Amount on such Distribution Date), (C) the Class M-2 Certificate Principal
Balance (after taking into account distributions of the Class M-2 Principal
Distribution Amount on such Distribution Date) and (D) the Class M-3 Certificate
Principal Balance immediately prior to such Distribution Date over (2) the
lesser of (A) 74.60% of the Stated Principal Balances of the Mortgage Loans as
of such Distribution Date and (B) the excess of the Stated Principal Balances
for the Mortgage Loans as of such Distribution Date over the Minimum Required
Overcollateralization Amount. Notwithstanding the foregoing, (I) on any
Distribution Date prior to the Stepdown Date on which the Certificate Principal
Balance of each Class of Class A, Class R, Class M-1 and Class M-2 Certificates
has been reduced to zero, the Class M-3 Principal Distribution Amount will equal
the lesser of (x) the outstanding Certificate Principal Balance of the Class M-3
Certificates and (y) 100% of the Principal Distribution Amount remaining after
any distributions on such Class A, Class R, Class M-1 and Class M-2 Certificates
and (II) in no event will the Class M-3 Principal Distribution Amount with
respect to any Distribution Date exceed the Class M-3 Certificate Principal
Balance.

     Class M-3 Unpaid Realized Loss Amount: As of any Distribution Date, the
excess of (1) the Class M-3 Applied Realized Loss Amount over (2) the sum of (x)
all distributions in reduction of the Class M-3 Unpaid Realized Loss Amounts on
all previous Distribution Dates and (y) all increases in the Certificate
Principal Balance of such Class M-3 Certificates pursuant to the last sentence
of the definition of "Certificate Principal Balance."

     Class P Certificate: Any Certificate designated as a Class P Certificate on
the face thereof, executed by the Trustee and authenticated by the Trustee in
substantially the form set forth in Exhibit A, representing the right to
distributions as set forth herein.

     Class Payment Shortfall: As defined in Section 2.07(d)(ii) herein.

     Class R Certificate: The Class R Certificate executed by the Trustee and
authenticated by the Trustee in substantially the form set forth in Exhibit A.

     Class R Certificate Principal Balance: As of any date of determination, the
aggregate Certificate Principal Balance of the Class R Certificate.

     Class R Current Interest: As of any Distribution Date, the interest accrued
during the related Accrual Period at the Class R Pass-Through Rate on the Class
R Certificate Principal Balance as of such Distribution Date plus the portion of
any previous distributions on such Class in respect of Current Interest or a
Class R Interest Carry Forward Amount that is recovered as a voidable preference
by a trustee in bankruptcy, less any Non-Supported Interest Shortfall allocated
on such Distribution Date to the Class R Certificate. For purposes of
calculating interest, principal distributions on a Distribution Date will be
deemed to have been made on the first day of the Accrual Period in which such
Distribution Date occurs.

     Class R Interest Carry Forward Amount: As of any Distribution Date, the sum
of (1) the excess of (A) the Class R Current Interest with respect to prior
Distribution Dates over (B) the amount actually distributed to the Class R
Certificate with respect to interest on such prior Distribution Dates and (2)
interest on such excess (to the extent permitted by applicable law) at the Class
R Pass-Through Rate for the related Accrual Period.


                                      -18-

<PAGE>

     Class R Margin: As of any Distribution Date up to and including the Initial
Optional Termination Date for the Certificates, 0.2800% per annum and, as of any
Distribution Date after the Initial Optional Termination Date, 0.5600% per
annum.

     Class R Pass-Through Rate: For the first Distribution Date, 5.6100% per
annum. As of any Distribution Date thereafter, the least of (1) One-Month LIBOR
plus the Class R Margin, (2) the Available Funds Cap for such Distribution Date
and (3) the Maximum Rate Cap for such Distribution Date.

     Class SWR Interest: The sole class of "residual interest" in the SWAP
REMIC.

     Closing Date: September 12, 2006.

     Code: The Internal Revenue Code of 1986, including any successor or
amendatory provisions.

     Collectable Arrearages: With respect to any Mortgage Loan that is
Delinquent 31 days or greater as of the Cut-off Date, the total amount of
scheduled monthly payments in respect of principal and/or interest due on or
prior to the Cut-off Date thereon but not received on or prior to the Cut-off
Date, exclusive of any Servicing Arrearages. As of the Cut-off Date, the
aggregate amount of Collectable Arrearages is $1,289,479.98. The Servicer shall
hold all amounts received in respect of Collectable Arrearages in an Eligible
Account in trust for the Certificateholders until the Arrearage Realization Date
for the related Mortgage Loan and then shall remit such amounts collected during
the related Due Period to the Trustee on the next Servicer Remittance Date.

     Collection Account: The separate Eligible Accounts created and initially
maintained by the Servicer pursuant to Section 3.05(d) in the name of the
Trustee for the benefit of the Certificateholders and designated, "Wilshire
Credit Corporation, as servicer for LaSalle Bank National Association, as
trustee, in trust for registered holders of Merrill Lynch Mortgage Investors
Trust, Mortgage Loan Asset-Backed Certificates, Series 2006-SD1". Funds in the
Collection Account shall be held in trust for the Certificateholders for the
uses and purposes set forth in this Agreement.

     Combined Loan-to-Value Ratio: The fraction, expressed as a percentage, the
numerator of which is the sum of (1) the original principal balance of the
related Mortgage Loan and (2) any outstanding principal balances of Mortgage
Loans the liens on which are senior to the lien on such related Mortgage Loan
(such sum calculated at the date of origination of such related Mortgage Loan)
and the denominator of which is the lesser of (A) the Appraised Value of the
related Mortgaged Property and (B) the sales price of the related Mortgaged
Property at time of origination.

     Commission: The Securities and Exchange Commission.

     Compensating Interest: For any Distribution Date and all Principal
Prepayments in full in respect of a Mortgage Loan that are received during the
period from the first day of the related Prepayment Period through the last day
of the calendar month preceding such Distribution Date, a payment made by the
Servicer in an amount not to exceed the product of (a) one-twelfth of 0.25% and
(b) the aggregate Stated Principal Balance of the Mortgage Loans for such
Distribution Date, equal to the amount of interest at the Net Mortgage Rate for
that Mortgage Loan from the date of prepayment through the 30th day of such
preceding calendar month; provided that any month consisting of less than 30
days shall be deemed to consist of 30 days.


                                      -19-

<PAGE>

     Corresponding Certificates: With respect to the Class LTA Interest, the
Class A and Class R Certificates. With respect to the Class LTM-1 Interest, the
Class M-1 Certificates. With respect to the Class LTM-2 Interest, the Class M-2
Certificates. With respect to the Class LTM-3 Interest, the Class M-3
Certificates. With respect to the Class LTB Interest, the Class B Certificates.

     Corresponding REMIC Regular Interest: For each Class of Certificates, the
interest in the Upper Tier REMIC listed on the same row in the table entitled
"Upper Tier REMIC" in the Preliminary Statement.

     Current Interest: Any of the Class A Current Interest, the Class R Current
Interest, the Class M-1 Current Interest, the Class M-2 Current Interest, the
Class M-3 Current Interest, the Class B Current Interest and the Class C Current
Interest.

     Cut-off Date: August 1, 2006.

     Cut-off Date Principal Balance: As to any Mortgage Loan, the unpaid
principal balance thereof as of the close of business on the calendar day
immediately preceding the Cut-off Date after application of all payments of
principal due on or prior to the Cut-off Date, whether or not received, and all
Principal Prepayments received prior to the Cut-off Date, but without giving
effect to any installments of principal received in respect of Due Dates after
the Cut-off Date.

     Defaulted Swap Termination Payment: Any payment required to be made by the
Supplemental Interest Trust to the Swap Counterparty pursuant to the Swap
Agreement as a result of an event of default under the Swap Agreement with
respect to which the Swap Counterparty is the defaulting party or a termination
event (including a Downgrade Termination Event) under that agreement (other than
illegality or a tax event) with respect to which the Swap Counterparty is the
sole Affected Party (as defined in the Swap Agreement).

     Definitive Certificates: As defined in Section 5.06.

     Deleted Mortgage Loan: A Mortgage Loan replaced or to be replaced by a
Replacement Mortgage Loan.

     Delinquent: A Mortgage Loan is "delinquent" if any payment due thereon is
not made pursuant to the terms of such Mortgage Loan by the close of business on
the day such payment is scheduled to be due. A Mortgage Loan is "30 days
delinquent" if such payment has not been received by the close of business on
the corresponding day of the month immediately succeeding the month in which
such payment was due, or, if there is no such corresponding day (e.g., as when a
30-day month follows a 31-day month in which a payment was due on the 31st day
of such month), then on the last day of such immediately succeeding month. With
respect to any Mortgage Loan due on any day other than the first day of the
month, such Mortgage Loan shall be deemed to be due on the first day of the
immediately succeeding month. Similarly for "60 days delinquent," "90 days
delinquent" and so on.

     Denomination: With respect to each Certificate, the amount set forth on the
face thereof as the "Initial Principal Balance of this Certificate."

     Depositor: Merrill Lynch Mortgage Investors, Inc., a Delaware corporation,
or any successor in interest.


                                      -20-

<PAGE>

     Depository: The initial Depository shall be The Depository Trust Company
("DTC"), the nominee of which is Cede & Co., or any other organization
registered as a "clearing agency" pursuant to Section 17A of the Securities
Exchange Act of 1934, as amended. The Depository shall initially be the
registered Holder of the Book-Entry Certificates. The Depository shall at all
times be a "clearing corporation" as defined in Section 8-102(3) of the Uniform
Commercial Code of the State of New York.

     Depository Agreement: With respect to Classes of Book-Entry Certificates,
the agreement between the Trustee and the initial Depository.

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

     Designated Transaction: A transaction in which the assets underlying the
Certificates consist of single-family residential, multi-family residential,
home equity, manufactured housing and/or commercial mortgage obligations that
are secured by single-family residential, multi-family residential, commercial
real property or leasehold interests therein.

     Determination Date: With respect to any Distribution Date, the 15th day of
the month of such Distribution Date or, if such 15th day is not a Business Day,
the immediately preceding Business Day.

     Disqualified Organization: (1) the United States, any state or political
subdivision thereof, any foreign government, any international organization, or
any agency or instrumentality of any of the foregoing, (2) any organization
(other than a cooperative described in Section 521 of the Code) which is exempt
from tax under Chapter 1 of Subtitle A of the Code unless such organization is
subject to the tax imposed by Section 511 of the Code and (3) any organization
described in Section 1381(a)(2)(C) of the Code.

     Distribution Date: The 25th day of each calendar month after the initial
issuance of the Certificates, or if such 25th day is not a Business Day, the
next succeeding Business Day, commencing in September 2006.

     Downgrade Termination Event: An event whereby (x) the Swap Counterparty (or
its guarantor) ceases to have short term unsecured and/or long term debt ratings
at least equal to the levels specified in the Swap Agreement, and (y) at least
one of the following events has not occurred (except to the extent otherwise
approved by the Rating Agencies): (i) within the time period specified in the
Swap Agreement with respect to such downgrade, the Swap Counterparty shall
transfer the Swap Agreement, in whole, but not in part, to a substitute swap
counterparty that satisfies the requirements set forth in the Swap Agreement,
subject to the satisfaction of the Rating Agency Condition or (ii) within the
time period specified in the Swap Agreement with respect to such downgrade, the
Swap Counterparty shall collateralize its exposure to the Trust Fund pursuant to
an ISDA Credit Support Annex, subject to the satisfaction of the Rating Agency
Condition; provided that such ISDA Credit Support Annex shall be made a credit
support document for the Swap Counterparty pursuant to an amendment to the Swap
Agreement.

     Due Date: With respect to any Distribution Date and any Mortgage Loan, the
day during the related Due Period on which a Scheduled Payment is due.


                                      -21-

<PAGE>

     Due Period: With respect to any Distribution Date, the period beginning on
the second day of the calendar month preceding the calendar month in which such
Distribution Date occurs and ending on the first day of the month in which such
Distribution Date occurs.

     Eligible Account: An account that is (i) maintained with a depository
institution the long-term unsecured debt obligations of which are rated by each
Rating Agency in one of its two highest rating categories, or (ii) maintained
with the corporate trust department of a bank which (A) has a rating of at least
Baa3 or P-3 by Moody's and (B) is either the Depositor or the corporate trust
department of a national banking association or banking corporation which has a
rating of at least A-1 by S&P or F1 by Fitch, or (iii) an account or accounts
the deposits in which are fully insured by the FDIC, or (iv) an account or
accounts, acceptable to each Rating Agency without reduction or withdrawal of
the rating of any Class of Certificates, as evidenced in writing, by a
depository institution in which such accounts are insured by the FDIC (to the
limit established by the FDIC), the uninsured deposits in which accounts are
otherwise secured such that, as evidenced by an Opinion of Counsel delivered to
and acceptable to the Trustee and each Rating Agency, the Certificateholders
have a claim with respect to the funds in such account and a perfected first
security interest against any collateral (which shall be limited to Permitted
Investments) securing such funds that is superior to claims of any other
depositors or creditors of the depository institution with which such account is
maintained, or (v) maintained at an eligible institution whose commercial paper,
short-term debt or other short-term deposits are rated at least A-1+ by S&P and
F-1+ by Fitch, or (vi) maintained with a federal or state chartered depository
institution the deposits in which are insured by the FDIC to the applicable
limits and the short-term unsecured debt obligations of which (or, in the case
of a depository institution that is a subsidiary of a holding company, the
short-term unsecured debt obligations of such holding company) are rated A-1 by
S&P or Prime-1 by Moody's at the time any deposits are held on deposit therein,
or (vii) a segregated trust account or accounts maintained with a federal or
state chartered depository institution or trust company acting in its fiduciary
capacity, or (viii) otherwise acceptable to each Rating Agency, as evidenced by
a letter from each Rating Agency to the Trustee.

     ERISA: The Employee Retirement Income Security Act of 1974, including any
successor or amendatory provisions.

     ERISA-Qualifying Underwriting: Not applicable.

     ERISA Restricted Certificates: Any Certificate other than a Class A or
Class R Certificate.

     Event of Default: As defined in Section 7.01 hereof.

     Excess Interest: On any Distribution Date, for each Class of the Class A,
Class R, Class M and Class B Certificates, the excess, if any, of (1) the amount
of interest such Class of Certificates is entitled to receive on such
Distribution Date over (2) the amount of interest such Class of Certificates
would have been entitled to receive on such Distribution Date at an interest
rate equal to the REMIC Pass-Through Rate.

     Excess Proceeds: With respect to any Liquidated Loan, any Liquidation
Proceeds that are in excess of the sum of (1) the unpaid principal balance of
such Liquidated Loan as of the date of such liquidation plus (2) interest at the
Mortgage Rate from the Due Date as to which interest was last paid or advanced
to Certificateholders (and not reimbursed to the Servicer) up to the Due Date in
the month in


                                      -22-

<PAGE>

which such Liquidation Proceeds are required to be distributed on the unpaid
principal balance of such Liquidated Loan outstanding during each Due Period as
to which such interest was not paid or advanced.

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

     Extra Principal Distribution Amount: With respect to any Distribution Date,
(1) prior to the Stepdown Date, the excess of (A) the sum of (i) the Aggregate
Certificate Principal Balance immediately preceding such Distribution Date
reduced by the Principal Funds with respect to such Distribution Date and (ii)
$11,091,968 and over (B) the aggregate Stated Principal Balance of the Mortgage
Loans as of such Distribution Date and (2) on and after the Stepdown Date, (A)
the sum of (x) the Aggregate Certificate Principal Balance immediately preceding
such Distribution Date, reduced by the Principal Funds with respect to such
Distribution Date and (y) the greater of (a) 13.40% of the aggregate Stated
Principal Balance of the Mortgage Loans and (b) the Minimum Required
Overcollateralization Amount less (B) the aggregate Stated Principal Balance of
the Mortgage Loans as of such Distribution Date; provided, however, that if on
any Distribution Date a Stepdown Trigger Event is in effect, the Extra Principal
Distribution Amount will not be reduced to the applicable percentage of the
then-current aggregate Stated Principal Balance of the Mortgage Loans (and will
remain fixed at the applicable percentage of the aggregate Stated Principal
Balance of the Mortgage Loans as of the Due Date immediately prior to the
Stepdown Trigger Event) until the next Distribution Date on which the Stepdown
Trigger Event is not in effect.

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

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

     Fitch: Fitch, Inc., or any successor in interest.

     Fixed Rate Mortgage Loan: A Mortgage Loan identified in the Mortgage Loan
Schedule as having a Mortgage Rate that is fixed.

     Floating Rate Certificate Carryover: With respect to a Distribution Date,
means, in the event that the Pass-Through Rate for a Class of Offered
Certificates is based upon the Available Funds Cap or the Maximum Rate Cap, the
sum of (A) the excess of (1) the amount of interest that such Class would have
been entitled to receive on such Distribution Date had the Pass-Through Rate for
that Class not been calculated based on the Available Funds Cap or the Maximum
Rate Cap, up to but not exceeding the greater of (a) the Maximum Rate Cap or (b)
the sum of (i) the Available Funds Cap and (ii) the product of (AA) a fraction,
the numerator of which is 360 and the denominator of which is the actual number
of days in the related Accrual Period and (BB) the sum of (x) the quotient of
(I) an amount equal to the proceeds, if any, payable under the related Cap
Contract with respect to such Distribution Date and (II) the aggregate
Certificate Principal Balance of each of the Classes of Offered Certificates to
which such Cap Contract relates for such Distribution Date and (y) the quotient
obtained by dividing (I) an amount equal to any Net Swap Payments owed by the
Swap Counterparty for such Distribution Date by (II) the aggregate Stated
Principal Balance of the Mortgage Loans as of the immediately preceding
Distribution Date over (2) the amount of interest such Class was entitled to
receive on such Distribution Date based on the Available Funds Cap; together
with (B) the unpaid portion of any such excess from prior Distribution Dates
(and interest accrued thereon at the then applicable Pass-Through Rate for such
Class, without giving effect to the Available Funds Cap or the Maximum Rate Cap)
and (C) any amount previously


                                      -23-

<PAGE>

distributed with respect to Floating Rate Certificate Carryover for such Class
that is recovered as a voidable preference by a trustee in bankruptcy.

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

     Grantor Trusts: The grantor trusts described in Section 2.07 hereof.

     Gross Margin: The percentage set forth in the related Mortgage Note for
each of the Adjustable Rate Mortgage Loans which is to be added to the
applicable index for use in determining the Mortgage Rate on each Adjustment
Date, and which is set forth in the Mortgage Loan Schedule for each Adjustable
Rate Mortgage Loan.

     Indenture: An indenture relating to the issuance of NIM Notes.

     Initial Adjustment Date: As to any Adjustable Rate Mortgage Loan, the first
Adjustment Date following the origination of such Mortgage Loan.

     Initial Certificate Principal Balance: With respect to any Certificate, the
Certificate Principal Balance of such Certificate or any predecessor Certificate
on the Closing Date as set forth in Section 5.01 hereof.

     Initial Mortgage Rate: As to each Mortgage Loan, the Mortgage Rate in
effect prior to the Initial Adjustment Date.

     Initial Optional Termination Date: The first Distribution Date on which the
aggregate Stated Principal Balance of the Mortgage Loans (or if such Mortgage
Loan is an REO Property, the fair market value of such REO Property) is equal to
or less than 10% of the aggregate Stated Principal Balance of the Mortgage Loans
as of the Cut-off Date.

     Insurance Policy: With respect to any Mortgage Loan or the related
Mortgaged Property included in the Trust Fund, any insurance policy, including
all riders and endorsements thereto in effect with respect to such Mortgage Loan
or Mortgaged Property, including any replacement policy or policies for any
insurance policies.

     Insurance Proceeds: Proceeds paid in respect of a Mortgage Loan or the
related Mortgaged Property pursuant to any Insurance Policy or any other
insurance policy covering such Mortgage Loan or Mortgaged Property, to the
extent such proceeds are payable to the mortgagee under the Mortgage, the
Servicer or the Trustee under the deed of trust and are not applied to the
restoration of the related Mortgaged Property or released either to the
Mortgagor or to the holder of a senior lien on the related Mortgaged Property in
accordance with the procedures that the Servicer would follow in servicing
mortgage loans held for its own account, in each case other than any amount
included in such Insurance Proceeds in respect of Insured Expenses.

     Insured Expenses: Expenses covered by an Insurance Policy or any other
insurance policy with respect to a Mortgage Loan or the related Mortgaged
Property.


                                      -24-
<PAGE>

     Interest Carry Forward Amount: Any of the Class A Interest Carry Forward
Amount, the Class R Interest Carry Forward Amount, the Class M-1 Interest Carry
Forward Amount, the Class M-2 Interest Carry Forward Amount, the Class M-3
Interest Carry Forward Amount, the Class B Interest Carry Forward Amount or the
Class C Interest Carry Forward Amount, as the case may be.

     Interest Determination Date: With respect to the LIBOR Certificates, for
any Accrual Period, the second LIBOR Business Day preceding the commencement of
such Accrual Period.

     Interest Funds: With respect to any Distribution Date, the sum, without
duplication, of (1) all scheduled interest due during the related Due Period and
received before the related Servicer Remittance Date or advanced on or before
the related Servicer Remittance Date less the Servicing Fee, (2) all Advances
relating to interest with respect to the Mortgage Loans, (3) all Compensating
Interest with respect to the Mortgage Loans, (4) Liquidation Proceeds with
respect to the Mortgage Loans (to the extent such Liquidation Proceeds relate to
interest) collected during the related Prepayment Period, (5) all proceeds of
any purchase pursuant to Section 2.02 or 2.03 during the related Prepayment
Period or pursuant to Section 9.01 not later than the related Determination Date
(to the extent that such proceeds relate to interest) less the Servicing Fee and
(6) all Prepayment Charges received with respect to the Mortgage Loans during
the related Prepayment Period, less (A) all Non-Recoverable Advances relating to
interest and (B) other amounts reimbursable (including without limitation
indemnity payments) to the Servicer and the Trustee pursuant to this Agreement
allocable to interest.

     Issuing Entity: Merrill Lynch Mortgage Investors Trust, Series 2006-SD1.

     Latest Possible Maturity Date: The latest maturity date for any Mortgage
Loan in the Trust Fund plus one year.

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

     LIBOR Certificates: The Class A, Class R and Class M Certificates.

     Liquidated Loan: With respect to any Distribution Date, a defaulted
Mortgage Loan that either (a) has been liquidated through deed-in-lieu of
foreclosure, foreclosure sale, trustee's sale or other realization as provided
by applicable law governing the real property subject to the related Mortgage
and any security agreements and as to which the Servicer has certified (in
accordance with Section 3.12) in the related Prepayment Period that it has
received all amounts it expects to receive in connection with such liquidation
or (b) as to which is not a first lien Mortgage Loan and is delinquent 180 days
or longer, Servicer has certified in a certificate of an officer of the Servicer
delivered to the Trustee that it does not believe that there is a reasonable
likelihood that any further net proceeds will be received or recovered with
respect to such Mortgage Loan.

     Liquidation Proceeds: Amounts, including condemnation proceeds and
Insurance Proceeds, received in connection with the partial or complete
liquidation of Mortgage Loans, whether through trustee's sale, foreclosure sale,
sale by the Servicer pursuant to this Agreement or otherwise or amounts received
in connection with any condemnation or partial release of a Mortgaged Property
and any other proceeds received in connection with an REO Property, less the sum
of (i) related unreimbursed Advances, Servicing Fees, Servicing Advances and any
other expenses (other than Servicing Arrearages) related to such Mortgage Loan
and (ii) any Servicing Arrearages with respect to such Mortgage Loan, to


                                      -25-

<PAGE>

the extent that subtracting such amounts pursuant to this clause (ii) from
Liquidation Proceeds would not cause the Trust to incur any loss on such
Mortgage Loan.

     Loan-to-Value Ratio: With respect to any Mortgage Loan, the fraction,
expressed as a percentage, the numerator of which is the original principal
balance of the related Mortgage Loan and the denominator of which is the lesser
of (X) the Appraised Value of the related Mortgaged Property and (Y) the sales
price of the related Mortgaged Property at the time of origination.

     Losses: Any losses, claims, damages, liabilities or expenses collectively.

     Lower Tier REMIC: As described in the Preliminary Statement and Section
2.07.

     Lower Tier REMIC Interests: Each of the Class LTA Interest, the Class LTM-1
Interest, the Class LTM-2 Interest, the Class LTM-3, the Class LTB Interest, the
Class LTX Interest, the Class LT-IO Interest and the Class LTR Interest.

     Lower Tier REMIC Marker Interests: Each of the classes of Lower Tier REMIC
Regular Interests other than the Class LTX Interest, and the Class LT-IO
Interest.

     Lower Tier REMIC Regular Interests: Each of the Lower Tier REMIC Interests
other than the Class LTR Interest.

      Maximum Mortgage Rate: With respect to each Adjustable Rate Mortgage Loan,
the maximum rate of interest set forth as such in the related Mortgage Note and
with respect to each Fixed Rate Mortgage Loan, the rate of interest set forth in
the related Mortgage Note.

     Maximum Rate Cap: With respect to a Distribution Date, the per annum rate
equal to the product of (i) 12, (ii) the quotient of (x) the total scheduled
interest that would have been due on the Mortgage Loans had the Adjustable Rate
Mortgage Loans provided for interest at their maximum lifetime Net Mortgage
Rates and the Fixed Rate Mortgage Loans provided for interest at their Net
Mortgage Rates less any Net Swap Payments or Swap Termination Payments (other
than Defaulted Swap Termination Payments) owed to the Swap Counterparty for such
Distribution Date, and (y) the aggregate Stated Principal Balance of the
Mortgage Loans as of the immediately preceding Distribution Date (or, in the
case of the first Distribution Date, as of the Cut-off Date), and (iii) only
with respect to the Class A Certificates, Class R Certificates and the Class M
Certificates, a fraction, the numerator of which is 30 and the denominator of
which is the actual number of days in the related Accrual Period.

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

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

     MERS System: The system of recording transfers of mortgage electronically
maintained by MERS.

     MIN: The loan number for any MERS Loan.

     Minimum Mortgage Rate: With respect to each Adjustable Rate Mortgage Loan,
the minimum rate of interest set forth as such in the related Mortgage Note.


                                      -26-

<PAGE>

     Minimum Required Overcollateralization Amount: An amount equal to the
product of (x) 0.50% and (y) the Stated Principal Balance of the Mortgage Loans
as of the Cut-off Date.

     MLML: Merrill Lynch Mortgage Lending, Inc., a Delaware corporation, or its
successors in interest.

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

     Monthly Statement: The statement delivered to the Certificateholders
pursuant to Section 4.05.

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

     Mortgage: With respect to a Mortgage Loan, the mortgage, deed of trust or
other instrument with all riders thereto creating a first or second lien or a
first or second priority ownership interest in an estate in fee simple in real
property securing a Mortgage Note.

     Mortgage File: The mortgage documents listed in Section 2.01 hereof
pertaining to a particular Mortgage Loan and any additional documents delivered
to the Trustee to be added to the Mortgage File pursuant to this Agreement.

     Mortgage Loan Schedule: The list of Mortgage Loans (as from time to time
amended by the Trustee to reflect the deletion of Deleted Mortgage Loans and the
addition of Replacement Mortgage Loans pursuant to the provisions of this
Agreement) transferred to the Trustee as part of the Trust Fund and from time to
time subject to this Agreement, attached hereto as Exhibit B-1, setting forth
the following information with respect to each Mortgage Loan:

          (i)   the loan number;

          (ii) the borrower name and address;

          (iii) the unpaid principal balance of the Mortgage Loans;

          (iv) the Initial Mortgage Rate;

          (v)   the original maturity date and the months remaining before
               maturity date;

          (vi) the original principal balance;

          (vii) the Cut-off Date Principal Balance;

          (viii) the first payment due date of the Mortgage Loan;

          (ix) the Loan-to-Value Ratio at origination with respect to a first
               lien Mortgage Loan, or the Combined Loan-to-Value Ratio with
               respect to a second lien Mortgage Loan;

          (x)   a code indicating whether the residential dwelling at the time of
               origination was represented to be owner-occupied;


                                      -27-

<PAGE>

          (xi) a code indicating the property type;

          (xii) with respect to each Adjustable Rate Mortgage Loan;

               (A)   the frequency of each Adjustment Date;

               (B)   the next Adjustment Date;

               (C)   the Maximum Mortgage Rate;

                (D)   the Minimum Mortgage Rate;

               (E)   the Mortgage Rate as of the Cut-off Date;

               (F)   the related Periodic Rate Cap;

               (G)   the Gross Margin;

               (H)   the lifetime rate cap;

          (xiii) location of the related Mortgaged Property;

          (xiv) a code indicating whether a Prepayment Charge is applicable;

               (A)   the period during which such Prepayment Charge is in effect;

               (B)   the amount of such Prepayment Charge;

               (C)   any limitations or other conditions on the enforceability of
                    such Prepayment Charge; and

               (D)   any other information pertaining to the Prepayment Charge
                    specified in the related Mortgage Note;

          (xv) the Credit Score and date obtained; and

          (xvi) the MIN.

     Mortgage Loans: Such of the mortgage loans transferred and assigned to the
Trustee pursuant to the provisions hereof as from time to time are held as a
part of the Trust Fund (including any REO Property), the mortgage loans so held
being identified in the Mortgage Loan Schedule, notwithstanding foreclosure or
other acquisition of title of the related Mortgaged Property. Any mortgage loan
that was intended by the parties hereto to be transferred to the Trust Fund as
indicated by such Mortgage Loan Schedule which is in fact not so transferred for
any reason shall continue to be a Mortgage Loan hereunder until the Purchase
Price with respect thereto has been paid to the Issuing Entity.

     Mortgage Note: The original executed note or other evidence of indebtedness
evidencing the indebtedness of a Mortgagor under a Mortgage Loan and all
amendments, modifications and attachments thereto with all riders attached
thereto.


                                      -28-

<PAGE>

     Mortgage Pool: The aggregate of the Mortgage Loans identified in the
Mortgage Loan Schedule.

     Mortgaged Property: The underlying property securing a Mortgage Loan.

     Mortgage Rate: The annual rate of interest borne by a Mortgage Note from
time to time.

     Mortgagor: The obligor on a Mortgage Note.

     Net Mortgage Rate: As to each Mortgage Loan, and at any time, the per annum
rate equal to the then current Mortgage Rate less the Servicing Fee Rate.

     Net Rate: The per annum rate set forth in footnote 3 to the description of
the Lower Tier REMIC in the Preliminary Statement hereto (such rate being based
on the weighted average of the interest rates on the SWAP REMIC Regular
Interests as adjusted and as set forth in such footnote).

     Net Swap Payment: With respect to any Distribution Date, any net payment
(other than a Swap Termination Payment or Defaulted Swap Termination Payment)
made by the Supplemental Interest Trust to the Swap Counterparty on the related
Fixed Rate Payer Payment Date (as defined in the Swap Agreement) or made by the
Swap Counterparty to the Supplemental Interest Trust on the related Floating
Rate Payer Payment Date (as defined in the Swap Agreement). In each case, the
Net Swap Payment shall not be less than zero.

     Net WAC: With respect to any Distribution Date, the weighted average Net
Mortgage Rate for the Mortgage Loans calculated based on the respective Net
Mortgage Rates and the Stated Principal Balances of such Mortgage Loans as of
the preceding Distribution Date (or, in the case of the first Distribution Date,
as of the Cut-off Date).

     NIM Notes: The notes to be issued pursuant to the Indenture.

     Non-Recoverable Advance: Any portion of an Advance previously made or
proposed to be made by the Servicer that, in the good faith judgment of the
Servicer, will not or, in the case of a current delinquency, would not, be
ultimately recoverable by the Servicer from the related Mortgagor, related
Liquidation Proceeds or otherwise related to the Mortgage Loans.

     Non-Recoverable Servicing Advance: Any portion of a Servicing Advance
previously made or proposed to be made by the Servicer that, in the good faith
judgment of the Servicer, will not or, in the case of a current Servicing
Advance, would not, be ultimately recoverable by the Servicer from the related
Mortgagor, related Liquidation Proceeds or otherwise related to the Mortgage
Loans.

     Non-Supported Interest Shortfall: As defined in Section 4.02.

     Offered Certificates: The Class A, Class R, Class M and Class B
Certificates.

     Officer's Certificate: A certificate (1) signed by the Chairman of the
Board, the Vice Chairman of the Board, the President, a vice president (however
denominated), an Assistant Vice President, the Treasurer, the Secretary, or one
of the assistant treasurers or assistant secretaries of the Depositor, or
Trustee, the Servicer (or any other officer customarily performing functions
similar to those performed by any of the above designated officers and to whom,
with respect to a particular matter, such matter is referred because of such
officer's knowledge of and familiarity with a particular subject) or (2), if


                                      -29-

<PAGE>

provided for in this Agreement, signed by a Servicing Officer, as the case may
be, and delivered to the Depositor, the Servicer or the Trustee, as the case may
be, as required by this Agreement.

     One-Month LIBOR: With respect to any Accrual Period, the rate determined by
the Trustee on the related Interest Determination Date on the basis of (a) the
offered rates for one-month United States dollar deposits, as such rates appear
on Telerate page 3750, as of 11:00 a.m. (London time) on such Interest
Determination Date or (b) if such rate does not appear on Telerate Page 3750 as
of 11:00 a.m. (London time), the offered rates of the Reference Banks for
one-month United States dollar deposits, as such rates appear on the Reuters
Screen LIBO Page, as of 11:00 a.m. (London time) on such Interest Determination
Date. If One-Month LIBOR is determined pursuant to clause (b) above, on each
Interest Determination Date, One-Month LIBOR for the related Accrual Period will
be established by the Trustee as follows:

          (i)   If on such Interest Determination Date two or more Reference
               Banks provide such offered quotations, One-Month LIBOR for the
               related Accrual Period shall be the arithmetic mean of such
               offered quotations (rounded upwards if necessary to the nearest
               whole multiple of 0.03125%).

          (ii) If on such Interest Determination Date fewer than two Reference
               Banks provide such offered quotations, One-Month LIBOR for the
               related Accrual Period shall be the higher of (i) One-Month LIBOR
               as determined on the previous Interest Determination Date and
               (ii) the Reserve Interest Rate.

     Opinion of Counsel: A written opinion of counsel, who may be counsel for
the Depositor or the Servicer reasonably acceptable to each addressee of such
opinion; provided, however, that with respect to Section 6.04 or 10.01, or the
interpretation or application of the REMIC Provisions, such counsel must (1) in
fact be independent of the Depositor or the Servicer, (2) not have any direct
financial interest in the Depositor or the Servicer or in any Affiliate of
either such party, and (3) not be connected with the Depositor or the Servicer
as an officer, employee, promoter, underwriter, trustee, partner, director or
person performing similar functions.

     Optional Termination: The termination of the Trust Fund hereunder pursuant
to clause (a) of Section 9.01 hereof.

     Optional Termination Amount: The repurchase price received by the Trustee
in connection with any repurchase of all of the Mortgage Loans pursuant to
Section 9.01.

     Optional Termination Price: On any date after the Initial Optional
Termination Date an amount equal to the sum of (i) the then aggregate
outstanding Stated Principal Balance of the Mortgage Loans (or if such Mortgage
Loan is an REO Property, the fair market value of such REO Property), plus
accrued interest thereon at the applicable Mortgage Rate through the Due Date in
the month in which the proceeds of the auction will be distributed on the
Certificates, (ii) any unreimbursed fees and out-of-pocket costs and expenses
owed to the Trustee or the Servicer and all unreimbursed Advances and Servicing
Advances, in each case incurred by such party in the performance of its
obligations, (iii) any unreimbursed costs, penalties and/or damages incurred by
the Trust Fund in connection with any violation relating to any of the Mortgage
Loans of any predatory or abusive lending law and (iv) any unpaid Net Swap
Payments and any Swap Termination Payment (including the Swap Termination
Payment determined in connection with the Optional Termination) owed to the Swap
Counterparty; such Swap


                                      -30-

<PAGE>

Termination Payment shall include any payment resulting from the termination of
the Swap Agreement after the Optional Termination Date but prior to the final
distribution to the Certificates.

     OTS: The Office of Thrift Supervision.

     Outstanding: With respect to the Certificates as of any date of
determination, all Certificates theretofore executed and authenticated under
this Agreement except: (1) Certificates theretofore canceled by the Trustee or
delivered to the Trustee for cancellation; and (2) Certificates in exchange for
which or in lieu of which other Certificates have been executed by the Trustee
and delivered by the Trustee pursuant to this Agreement.

     Outstanding Mortgage Loan: As of any Distribution Date, a Mortgage Loan
with a Stated Principal Balance greater than zero that was not the subject of a
Principal Prepayment in full, and that did not become a Liquidated Loan, prior
to the end of the related Due Period.

     Overcollateralization Amount: As of any date of determination, the excess
of (1) the Stated Principal Balance of the Mortgage Loans over (2) the
Certificate Principal Balance of the Certificates (other than the Class P
Certificates and the Class C Certificates).

     Ownership Interest: As to any Certificate, any ownership interest in such
Certificate including any interest in such Certificate as the Holder thereof and
any other interest therein, whether direct or indirect, legal or beneficial.

     P&I Arrearage: Upon the occurrence of an Arrearage Realization Date, the
amount of the aggregate Collectable Arrearages received by the Servicer for such
Mortgage Loan. P&I Arrearages shall be deemed to have been received by the
Servicer on the Arrearage Realization Date.

     Pass-Through Rate: With respect to any Class of Certificates, the
corresponding Pass-Through Rate for such Class of Certificates.

     Percentage Interest: With respect to:

          (i)   any Class, the percentage interest in the undivided beneficial
               ownership interest evidenced by such Class which shall be equal
               to the Certificate Principal Balance of such Class divided by the
               aggregate Certificate Principal Balance of all Classes; and

          (ii) any Certificate, the Percentage Interest evidenced thereby of the
               related Class shall equal the percentage obtained by dividing the
               Denomination of such Certificate by the aggregate of the
               Denominations of all Certificates of such Class; except that in
                the case of any Class P Certificates, the Percentage Interest
               with respect to such Certificate shown on the face of such
               Certificate.

     Periodic Rate Cap: As to each Adjustable Rate Mortgage Loan and the related
Mortgage Note, the provision therein that limits permissible increases and
decreases in the Mortgage Rate on any Adjustment Date.


                                      -31-

<PAGE>

     Permitted Activities: The primary activities of the Trust Fund created
pursuant to this Agreement which shall be:

          (i)   holding the Mortgage Loans transferred from the Depositor and
               other assets of the Issuing Entity, including the Supplemental
               Interest Trust subtrust, which in turn holds the Cap Contract and
               the Swap Agreement, and any credit enhancement and passive
               derivative financial instruments that pertain to beneficial
               interests issued or sold to parties other than the Depositor, its
               Affiliates, or its agents;

          (ii) issuing Certificates and other interests in the assets of the
               Trust Fund;

          (iii) through the appropriate subtrust, as applicable, receiving
               collections on the Mortgage Loans and the Swap Agreement and
               making payments on such Certificates and interests in accordance
               with the terms of this Agreement; and

          (iv) engaging in other activities that are necessary or incidental to
               accomplish these limited purposes, which activities cannot be
               contrary to the status of the Issuing Entity as a qualified
               special purpose entity under existing accounting literature.

     Permitted Investments: At any time, any one or more of the following
obligations and securities:

          (i)   obligations of the United States or any agency thereof, provided
               the timely payment of such obligations is backed by the full
               faith and credit of the United States;

          (ii) general obligations of or obligations guaranteed by any state of
               the United States or the District of Columbia receiving the
               highest long-term debt rating of each Rating Agency rating the
               Certificates;

          (iii) commercial or finance company paper, other than commercial or
               finance company paper issued by the Depositor, the Trustee or any
               of their Affiliates, which is then receiving the highest
               commercial or finance company paper rating of each such Rating
               Agency;

          (iv) certificates of deposit, demand or time deposits, or bankers'
               acceptances (other than banker's acceptances issued by the
               Trustee or any of its Affiliates) issued by any depository
               institution or trust company incorporated under the laws of the
               United States or of any state thereof and subject to supervision
                and examination by federal and/or state banking authorities,
               provided that the commercial paper and/or long term unsecured
               debt obligations of such depository institution or trust company
               are then rated one of the two highest long-term and the highest
               short-term ratings of each such Rating Agency for such
               securities;

          (v)   demand or time deposits or certificates of deposit issued by any
               bank or trust company or savings institution to the extent that
               such deposits are fully insured by the FDIC;


                                      -32-

<PAGE>

          (vi) guaranteed reinvestment agreements issued by any bank, insurance
                company or other corporation rated in the two highest long-term
               or the highest short-term ratings of each Rating Agency
               containing, at the time of the issuance of such agreements, such
               terms and conditions as will not result in the downgrading or
               withdrawal of the rating then assigned to the Certificates by any
               such Rating Agency as evidenced by a letter from each Rating
               Agency;

          (vii) repurchase obligations with respect to any security described in
               clauses (i) and (ii) above, in either case entered into with a
               depository institution or trust company (acting as principal)
               described in clause (v) above;

          (viii) securities (other than stripped bonds, stripped coupons or
               instruments sold at a purchase price in excess of 115% of the
               face amount thereof) bearing interest or sold at a discount
               issued by any corporation, other than the Trustee or any of its
               Affiliates, incorporated under the laws of the United States or
               any state thereof which, at the time of such investment, have one
               of the two highest long term ratings of each Rating Agency;

          (ix) interests in any money market fund (including those managed or
               advised by the Trustee or its Affiliates), which at the date of
               acquisition of the interests in such fund and throughout the time
               such interests are held in such fund has the highest applicable
               long term rating by each Rating Agency rating such fund; and

          (x)   short term investment funds sponsored by any trust company or
               national banking association incorporated under the laws of the
               United States or any state thereof, other than the Trustee or any
               of its Affiliates, which on the date of acquisition has been
               rated by each such Rating Agency in their respective highest
               applicable rating category;

provided, that no such instrument shall be a Permitted Investment if such
instrument (i) evidences the right to receive interest only payments with
respect to the obligations underlying such instrument, (ii) is purchased at a
premium or above par or (iii) is purchased at a deep discount; provided,
further, that no such instrument shall be a Permitted Investment (A) if such
instrument evidences principal and interest payments derived from obligations
underlying such instrument and the interest payments with respect to such
instrument provide a yield to maturity of greater than 120% of the yield to
maturity at par of such underlying obligations, or (B) if it may be redeemed at
a price below the purchase price (the foregoing clause (B) not to apply to
investments in units of money market funds pursuant to clause (ix) above); and
provided, further, (I) that no amount beneficially owned by any REMIC
(including, without limitation, any amounts collected by the Servicer but not
yet deposited in the Collection Account) may be invested in investments (other
than money market funds) treated as equity interests for Federal income tax
purposes, unless the Servicer shall receive an Opinion of Counsel, at the
expense of the party requesting that such investment be made, to the effect that
such investment will not adversely affect the status of the any REMIC provided
for herein as a REMIC under the Code or result in imposition of a tax on the
Issuing Entity or any REMIC provided for herein and (II) each such investment
must be a "permitted investment" within the meaning of Section 860G(a)(5) of the
Code. Permitted Investments that are subject to prepayment or call may not be
purchased at a price in excess of par.


                                      -33-

<PAGE>

     Permitted Transferee: Any Person other than (i) the United States, any
State or political subdivision thereof, or any agency or instrumentality of any
of the foregoing, (ii) a foreign government, International Organization or any
agency or instrumentality of either of the foregoing, (iii) an organization
(except certain farmers' cooperatives described in Section 521 of the Code) that
is exempt from tax imposed by Chapter 1 of the Code (including the tax imposed
by Section 511 of the Code on unrelated business taxable income) on any excess
inclusions (as defined in Section 860E(c)(1) of the Code) with respect to the
Class R Certificate, (iv) rural electric and telephone cooperatives described in
Section 1381(a)(2)(C) of the Code, and (v) a Person that is not a citizen or
resident of the United States, a corporation or partnership (or other entity
treated as a corporation or partnership for United States federal income tax
purposes) created or organized in or under the laws of the United States or any
State thereof or the District of Columbia or an estate whose income from sources
without the United States is includable in gross income for United States
federal income tax purposes regardless of its connection with the conduct of a
trade or business within the United States, or a trust if a court within the
United States is able to exercise primary supervision over the administration of
the trust and one or more United States persons have authority to control all
substantial decisions of the trust, unless, in the case of this clause (v), such
Person has furnished the transferor and the Trustee with a duly completed
Internal Revenue Service Form W-8ECI or applicable successor form. The terms
"United States," "State" and "International Organization" shall have the
meanings set forth in Section 7701 of the Code. A corporation will not be
treated as an instrumentality of the United States or of any State thereof for
these purposes if all of its activities are subject to tax and, with the
exception of the Federal Home Loan Mortgage Corporation, a majority of its board
of directors is not selected by such government unit.

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

     Pool Stated Principal Balance: As to any Distribution Date, the aggregate
of the Stated Principal Balances, as of such Distribution Date, of the Mortgage
Loans that were Outstanding Mortgage Loans as of such date.

     Preference Claim: The meaning set forth in Section 4.04(j) hereof.

     Preliminary Statement: The paragraphs in the preamble to this Agreement
that precede the heading "The SWAP REMIC."

     Prepayment Assumption: A rate of prepayment, as described in the Prospectus
Supplement in the definition of "Modeling Assumptions," relating to the Offered
Certificates.

     Prepayment Charges: Any prepayment premium or charge payable by a Mortgagor
in connection with any Principal Prepayment on a Mortgage Loan pursuant to the
terms of the related Mortgage Note or Mortgage, as applicable.

     Prepayment Interest Excess: With respect to any Servicer Remittance Date,
for each Mortgage Loan that was the subject of a Principal Prepayment in full
during the portion of the related Prepayment Period occurring between the first
day of the calendar month in which such Servicer Remittance Date occurs and the
last day of the related Prepayment Period, an amount equal to interest (to the
extent received) at the applicable Net Mortgage Rate on the amount of such
Principal Prepayment for the


                                      -34-

<PAGE>

number of days commencing on the first day of the calendar month in which such
Servicer Remittance Date occurs and ending on the date on which such Principal
Prepayment is so applied.

     Prepayment Interest Shortfall: With respect to any Distribution Date, for
each Mortgage Loan that was the subject of a Principal Prepayment in full (other
than a Principal Prepayment in full resulting from the purchase of a Mortgage
Loan pursuant to Section 2.02, 2.03 or 9.01 hereof and other than a Principal
Prepayment in full on a Mortgage Loan received during the period from and
including the first day to and including the 14th day of the month of such
Distribution Date), the amount, if any, by which (i) one month's interest at the
applicable Net Mortgage Rate on the Stated Principal Balance of such Mortgage
Loan as of the preceding Distribution Date exceeds (ii) the amount of interest
paid or collected in connection with such Principal Prepayment.

     Prepayment Period: With respect to any Distribution Date, the period
beginning with the opening of business on the 15th day of the calendar month
preceding the month in which such Distribution Date occurs (or in the case of
the first Distribution Date, beginning with the opening of business on the
Cut-off Date) and ending on the close of business on the 14th day of the month
in which such Distribution Date occurs.

     Principal Distribution Amount: With respect to each Distribution Date, the
sum of (i) the Principal Funds for such Distribution Date and (ii) any Extra
Principal Distribution Amount for such Distribution Date.

     Principal Funds: With respect to the Mortgage Loans and any Distribution
Date, the sum, without duplication, of (1) the scheduled principal due during
the related Due Period and received before the related Servicer Remittance Date
or advanced on or before the related Servicer Remittance Date, (2) prepayments
in full collected in the related Prepayment Period, (3) the Stated Principal
Balance of each Mortgage Loan that was purchased by the Depositor during the
related Prepayment Period or, in the case of a purchase pursuant to Section
9.01, on the Business Day prior to such Distribution Date, (4) the amount, if
any, by which the aggregate unpaid principal balance of any Replacement Mortgage
Loan is less than the aggregate unpaid principal of the related Deleted Mortgage
Loans delivered by the Sponsor in connection with a substitution of a Mortgage
Loan pursuant to Section 2.03(c), (5) all Liquidation Proceeds collected during
the related Prepayment Period (to the extent such Liquidation Proceeds relate to
principal and represent payment in full), (6) all Subsequent Recoveries received
during the related Due Period (other than collections in respect of Servicing
Arrearages) and (7) all other collections and recoveries in respect of principal
(other than collections in respect of Collectable Arrearages and P&I Arrearages)
during the related Due Period, less (A) all Non-Recoverable Advances relating to
principal with respect to the Mortgage Loans and (B) other amounts reimbursable
(including without limitation indemnity payments) to the Servicer, a custodian
and the Trustee pursuant to this Agreement allocable to principal.

     Principal Prepayment: Any Mortgagor payment or other recovery of (or
proceeds with respect to) principal on a Mortgage Loan (including Mortgage Loans
purchased or repurchased under Sections 2.02, 2.03 and 9.01 hereof) that is
received or recovered in advance of its scheduled Due Date and is not
accompanied by an amount as to interest representing scheduled interest due on
any date or dates in any month or months subsequent to the month of prepayment.
Partial Principal Prepayments shall be applied by the Servicer in accordance
with the terms of the related Mortgage Note.

     Prospectus Supplement: The Prospectus Supplement dated September 8, 2006,
relating to the public offering of the Offered Certificates.


                                      -35-

<PAGE>

     PUD: A Planned Unit Development.

     Purchase Price: With respect to any Mortgage Loan required to be
repurchased by the Sponsor pursuant to Section 2.02 or 2.03 hereof, an amount
equal to the sum of (i) 100% of the unpaid principal balance of the Mortgage
Loan as of the date of such purchase together with any unreimbursed Servicing
Advances, (ii) accrued interest thereon at the applicable Mortgage Rate from (a)
the date through which interest was last paid by the Mortgagor to (b) the Due
Date in the month in which the Purchase Price is to be distributed to
Certificateholders and (iii) any unreimbursed costs, penalties and/or damages
incurred by the Issuing Entity in connection with any violation relating to such
Mortgage Loan of any predatory or abusive lending law. With respect to any REO
Property purchased by the Servicer pursuant to Section 3.12(c) hereof, an amount
equal to the fair market value of such REO Property, as determined in good faith
by the Servicer.

     QIB: A "qualified institutional buyer" within the meaning of Rule 144A.

     Rating Agency: Either of S&P or Moody's. If any such organization or its
successor is no longer in existence, "Rating Agency" shall be a nationally
recognized statistical rating organization, or other comparable Person,
designated by the Depositor, notice of which designation shall be given to the
Trustee. References herein to a given rating category of a Rating Agency shall
mean such rating category without giving effect to any modifiers.

     Rating Agency Condition: As defined in the Swap Agreement.

     Realized Loss: With respect to (1) a Liquidated Loan, the amount, if any,
by which the Stated Principal Balance and accrued interest thereon at the Net
Mortgage Rate exceeds the amount actually recovered by the Servicer with respect
thereto (net of reimbursement of Advances and Servicing Advances) at the time
such Mortgage Loan became a Liquidated Loan or (2) with respect to a Mortgage
Loan which is not a Liquidated Loan, any amount of principal that the Mortgagor
is no longer legally required to pay (except for the extinguishment of debt that
results from the exercise of remedies due to default by the Mortgagor).

     Record Date: With respect to the first Distribution Date, the Closing Date.
With respect to any other Distribution Date, the close of business on the last
Business Day of the month preceding the month in which the applicable
Distribution Date occurs.

     Reference Banks: Barclays Bank PLC, U.S. Bank National Association,
Citibank, N.A., and NatWest, N.A.; provided that if any of the foregoing banks
are not suitable to serve as a Reference Bank, then any leading banks selected
by the Trustee which are engaged in transactions in Eurodollar deposits in the
international Eurocurrency market (i) with an established place of business in
London, England and (ii) whose quotations appear on the Reuters Screen LIBO Page
on the relevant Interest Determination Date.

     Regular Certificate: Any one of the Class A, Class R, Class M and Class B
Certificates.

     Regulation AB: Subpart 229.1100 - Asset Backed Securities (Regulation AB),
17 C.F.R. Sections 229.1100-229.1123, as such may be amended from time to time,
and subject to such clarification and interpretation as have been provided by
the Commission in the adopting release (Asset-Backed Securities,


                                       -36-

<PAGE>

Securities Act Release No. 33-8518, 70 Fed Reg. 1,506, 1.531 (Jan. 7, 2005)) or
by the staff of the Commission, or as may be provided by the Commission or its
staff from time to time.

     Regulation S: Regulation S promulgated under the Securities Act or any
successor provision thereto, in each case as the same may be amended from time
to time; and all references to any rule, section or subsection of, or definition
or term contained in, Regulation S means such rule, section, subsection,
definition or term, as the case may be, or any successor thereto, in each case
as the same may be amended from time to time.

     Regulation S Book-Entry Certificates: Certificates sold in offshore
transactions in reliance on Regulation S in the form of one or more permanent
global Certificates in definitive, fully registered form without interest
coupons, which shall be deposited on behalf of the subscribers for such
Certificates represented thereby with the Trustee, as custodian for DTC and
registered in the name of a nominee of DTC.

     Related Certificates: For each interest in the Upper Tier REMIC, the Class
of Certificates listed on the same row in the table entitled "Upper Tier REMIC"
in the Preliminary Statement.

     Relief Act: The Servicemembers Civil Relief Act or any similar state or
local law.

     Relief Act Shortfall: With respect to any Distribution Date and any
Mortgage Loan, any reduction in the amount of interest or principal collectible
on such Mortgage Loan for the most recently ended calendar month as a result of
the application of the Relief Act.

     REMIC: A "real estate mortgage investment conduit" within the meaning of
section 860D of the Code. References herein to "the REMICs" or "a REMIC" shall
mean any of (or, as the context requires, all of) the SWAP REMIC, the Lower Tier
REMIC and the Upper Tier REMIC.

     REMIC Pass-Through Rate: In the case of a Class of the Class A, Class R,
Class M and Class B Certificates, the Upper Tier REMIC Net WAC Cap for the
Corresponding REMIC Regular Interest.

     REMIC Provisions: Provisions of the federal income tax law relating to real
estate mortgage investment conduits, which appear at sections 860A through 860G
of Subchapter M of Chapter 1 of the Code, and related provisions, and proposed,
temporary and final regulations and published rulings, notices and announcements
promulgated thereunder, as the foregoing may be in effect from time to time as
well as provisions of applicable state laws.

     REMIC Regular Interests: Each of the interests in the Upper Tier REMIC as
set forth in the Preliminary Statement other than the Residual Interest.

     REMIC SWAP Rate: For each Distribution Date (and the related Accrual
Period), a per annum rate equal to the Fixed Rate under the Swap Agreement for
such Distribution Date, as set forth in the Prospectus Supplement.

     Remittance Report: As defined in Section 4.04(j) hereof.

     REO Property: A Mortgaged Property acquired by the Servicer through
foreclosure or deed-in-lieu of foreclosure in connection with a defaulted
Mortgage Loan.


                                      -37-

<PAGE>

     Re-Performing Loan: A Mortgage Loan which had defaulted in the past and
which is currently at least 90 days delinquent with respect to certain scheduled
monthly payments in respect of principal and/or interest, but for which the
related mortgagor has made, in the aggregate, at least three scheduled monthly
payments in respect of principal and/or interest in the four calendar months
preceding the Cut-off Date (regardless of the timing of receipt of such
payments).

     Replacement Mortgage Loan: A Mortgage Loan substituted by the Depositor for
a Deleted Mortgage Loan, which must, on the date of such substitution, as
confirmed in a Request for Release, substantially in the form of Exhibit I (1)
have a Stated Principal Balance, after deduction of the principal portion of the
Scheduled Payment due in the month of substitution, not in excess of, and not
less than 90% of the Stated Principal Balance of the Deleted Mortgage Loan; (2)
with respect to any Fixed Rate Mortgage Loan, have a Mortgage Rate not less than
or no more than 1% per annum higher than the Mortgage Rate of the Deleted
Mortgage Loan and, with respect to any Adjustable Rate Mortgage Loan: (A) have a
Maximum Mortgage Rate no more than 1% per annum higher or lower than the Maximum
Mortgage Rate of the Deleted Mortgage Loan; (B) have a Minimum Mortgage Rate no
more than 1% per annum higher or lower than the Minimum Mortgage Rate of the
Deleted Mortgage Loan; (C) have the same index and Periodic Rate Cap as that of
the Deleted Mortgage Loan and a Gross Margin not more than 1% per annum higher
or lower than that of the Deleted Mortgage Loan; (D) not permit conversion of
the related Mortgage Rate to a fixed Mortgage Rate and (F) currently be accruing
interest at a rate not more than 1% per annum higher or lower than that of the
Deleted Mortgage Loan; (3) have a similar or higher FICO score or credit grade
than that of the Deleted Mortgage Loan; (4) have a Loan-to-Value Ratio (or
Combined Loan-to-Value Ratio, in the case of the Mortgage Loans in a second lien
position) no higher than that of the Deleted Mortgage Loan; (5) have a remaining
term to maturity no greater than (and not more than one year less than) that of
the Deleted Mortgage Loan; (6) provide for a Prepayment Charge on terms
substantially similar to those of the Prepayment Charge, if any, of the Deleted
Mortgage Loan; (7) have the same lien priority as the Deleted Mortgage Loan; (8)
constitute the same occupancy type as the Deleted Mortgage Loan; and (9) comply
with each representation and warranty set forth in Section 2.03 hereof.

     Request for Release: The Request for Release of Documents submitted by the
Servicer to the Trustee, substantially in the form of Exhibit I hereto.

     Required Insurance Policy: With respect to any Mortgage Loan, any insurance
policy that is required to be maintained from time to time under this Agreement.

     Required Percentage: As of any Distribution Date following the Stepdown
Date, the quotient of (1) the excess of (A) the aggregate Stated Principal
Balance of the Mortgage Loans as of such Distribution Date, over (B) the
Certificate Principal Balance of the most senior Class of Certificates
outstanding as of such Distribution Date, prior to giving effect to
distributions to be made on such Distribution Date and (2) the aggregate Stated
Principal Balance of the Mortgage Loans as of such Distribution Date.

     Requirements: Any rules or regulations promulgated pursuant to the
Sarbanes-Oxley Act of 2002 (as such may be amended from time to time).

     Reserve Interest Rate: With respect to any Interest Determination Date, the
rate per annum that the Trustee determines to be (1) the arithmetic mean
(rounded upwards if necessary to the nearest whole multiple of 0.03125%) of the
one-month United States dollar lending rates which New York City banks


                                      -38-

<PAGE>

selected by the Trustee are quoting on the relevant Interest Determination Date
to the principal London offices of leading banks in the London interbank market
or (2) in the event that the Trustee can determine no such arithmetic mean, the
lowest one-month United States dollar lending rate which New York City banks
selected by the Trustee are quoting on such Interest Determination Date to
leading European banks.

     Residual Interest: An interest in the Upper Tier REMIC that is entitled to
all distributions of principal and interest on the Class R Certificate other
than distributions in respect of the Class SWR Interest and Class LTR Interest
and distributions on the Class R Certificate in respect of Excess Interest.

     Responsible Officer: When used with respect to the Trustee or the Servicer,
any officer of the Trustee or the Servicer with direct responsibility for the
administration of this Agreement and any other officer to whom, with respect to
a particular matter, such matter is referred because of such officer's knowledge
of and familiarity with the particular subject.

     Reuters Screen LIBO Page: The display designated as page "LIBO" on the
Reuters Monitor Money Rates Service (or such other page as may replace such LIBO
page on that service) for the purpose of displaying London interbank offered
rates of major banks.

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

     Sale Agreement: The Mortgage Loan Sale and Assignment Agreement dated as of
February 1, 2006 between the Depositor and the Sponsor.

      Sarbanes-Oxley Certification: Has the meaning set forth in Section 3.20.

     Scheduled Payment: The scheduled monthly payment on a Mortgage Loan due on
any Due Date allocable to principal and/or interest on such Mortgage Loan.

     Securities Act: The Securities Act of 1933, as amended.

     Servicer: Wilshire Credit Corporation, a Nevada corporation, or its
successor in interest.

     Servicer Advance Date: As to any Distribution Date, the related Servicer
Remittance Date.

     Servicer Remittance Date: With respect to any Distribution Date, the later
of two Business Days after the 15th day of the month in which such Distribution
Date occurs and the 18th day (or if such day is not a Business Day, the next
preceding Business Day) of the month in which such Distribution Date occurs.

     Servicing Advances: All customary, reasonable and necessary "out of pocket"
costs and expenses incurred in the performance by the Servicer of its servicing
obligations hereunder, including, but not limited to, the cost of (1) the
preservation, inspection, restoration and protection of a Mortgaged Property,
including without limitation advances in respect of real estate taxes and
assessments, (2) any collection, enforcement or judicial proceedings, including
without limitation foreclosures, collections and liquidations, (3) the
conservation, management, sale and liquidation of any REO Property, (4)
executing and recording instruments of satisfaction, deeds of reconveyance,
substitutions of trustees on deeds of trust or Assignments of Mortgage to the
extent not otherwise recovered from the related Mortgagors or


                                      -39-

<PAGE>

payable under this Agreement, (5) correcting errors of prior servicers; costs
and expenses charged to the Servicer by the Trustee; tax tracking; title
research; flood certifications; and lender paid mortgage insurance, (6)
obtaining or correcting any legal documentation required to be included in the
Mortgage Files and reasonably necessary for the Servicer to perform its
obligations under this Agreement and (7) compliance with the obligations under
Sections 3.01 and 3.10.

     Servicing Arrearages: With respect to any Mortgage Loan, the total amount
of any unreimbursed amounts that would have constituted Servicing Advances had
such amounts been advanced under this Agreement and that were advanced on or
prior to the Cut-off Date but not recovered on or prior to the Cut-off Date.
Upon the Servicer's collection of any Servicing Arrearages during a Due Period
the Servicer shall remit such collections to the Depositor.

     Servicing Criteria: The "servicing criteria" set forth in Item 1122(d) of
Regulation AB, as such may be amended from time to time.

     Servicing Fee: As to each Mortgage Loan and any Distribution Date, an
amount equal to the product of (x) the Servicing Fee Rate and (y) the Stated
Principal Balance of such Mortgage Loan as of the preceding Distribution Date
or, in the event of any payment of interest that accompanies a Principal
Prepayment in full made by the Mortgagor, interest at the Servicing Fee Rate on
the Stated Principal Balance of such Mortgage Loan as of the preceding
Distribution Date for the period covered by such payment of interest.

     Servicing Fee Rate: 0.50% per annum for each Mortgage Loan.

     Servicing Officer: Any officer of the Servicer involved in, or responsible
for, the administration and servicing of the Mortgage Loans whose name and
facsimile signature appear on a list of servicing officers furnished to the
Trustee by the Servicer on the Closing Date pursuant to this Agreement, as such
lists may from time to time be amended.

     Servicing Rights Pledgee: One or more lenders, selected by the Servicer, to
which the Servicer may pledge and assign all of its right, title and interest
in, to and under this Agreement.

     Servicing Transfer Costs: In the event that the Servicer does not reimburse
the Trustee under this Agreement, all costs associated with the transfer of
servicing from the predecessor Servicer, including, without limitation, any
costs or expenses associated with the termination of the predecessor Servicer,
the appointment of a successor servicer, the complete transfer of all servicing
data and the completion, correction or manipulation of such servicing data as
may be required by the Trustee or any successor servicer to correct any errors
or insufficiencies in the servicing data or otherwise to enable the Trustee or
successor servicer to service the Mortgage Loans properly and effectively.

     SFAS 140: Statement of Financial Accounting Standard No. 140, Accounting
for Transfers and Servicing of Financial Assets and Extinguishments of
Liabilities dated September 2000, published by the Financial Accounting
Standards Board of the Financial Accounting Foundation.

     Significance Estimate: With respect to any Distribution Date, and in
accordance with Item 1115 of Regulation AB, shall be an amount determined based
on the reasonable good-faith estimate by the Depositor or its Affiliate (and
reported to the Trustee) of the aggregate maximum probable exposure of the
outstanding Certificates to the Swap Agreement.


                                      -40-
<PAGE>

     Significance Percentage: With respect to any Distribution Date, and in
accordance with Item 1115 of Regulation AB, shall be a percentage equal to the
Significance Estimate divided by the aggregate outstanding Certificate Principal
Balance of the Certificates, prior to the distribution of the Principal
Distribution Amount on such Distribution Date.

     Sponsor: Merrill Lynch Mortgage Lending, Inc., a Delaware corporation, or
its successor in interest.

     Startup Day: As defined in Section 2.07 hereof.

     Stated Principal Balance: With respect to any Mortgage Loan or related REO
Property (1) as of the Cut-off Date, the Cut-off Date Principal Balance thereof,
and (2) as of any Distribution Date, such Cut-off Date Principal Balance, minus
the sum of (A) the principal portion of the Scheduled Payments (x) due with
respect to such Mortgage Loan during each Due Period ending prior to such
Distribution Date and (y) that were received by the Servicer as of the close of
business on the Determination Date related to such Distribution Date or with
respect to which Advances were made on the Servicer Advance Date prior to such
Distribution Date and (B) all Principal Prepayments with respect to such
Mortgage Loan received on or prior to the last day of the related Prepayment
Period, and all Liquidation Proceeds to the extent applied by the Servicer as
recoveries of principal in accordance with Section 3.12 with respect to such
Mortgage Loan, that were received by the Servicer as of the close of business on
the last day of the related Due Period. Notwithstanding the foregoing, the
Stated Principal Balance of a Liquidated Loan shall be deemed to be zero.

     Stepdown Date: The earlier of: (A) the first Distribution Date on which the
aggregate Certificate Principal Balance of the Class A and Class R Certificates
has been reduced to zero; and (B) the later to occur of (1) the Distribution
Date in September 2009 or (2) the first Distribution Date on which the
Certificate Principal Balance of the Class A and Class R Certificates (after
giving effect to distributions of the Principal Funds amount for such
Distribution Date) is less than or equal to 30.20% of the aggregate Stated
Principal Balances of the Mortgage Loans as of such Distribution Date.

     Stepdown Required Loss Percentage: For any Distribution Date, the
applicable percentage for such Distribution Date set forth in the following
table:

<TABLE>
<CAPTION>
DISTRIBUTION DATE OCCURRING IN           STEPDOWN REQUIRED LOSS PERCENTAGE
------------------------------    -----------------------------------------------
<S>                               <C>
September 2008 - August 2009      2.70% with respect to September 2008, plus an
                                 additional 1/12th of 2.85% for each month
                                 thereafter

September 2009 - August 2010      5.55% with respect to September 2009, plus an
                                 additional 1/12th of 3.10% for each month
                                 thereafter

September 2010 - August 2011      8.65% with respect to September 2010, plus an
                                 additional 1/12th of 2.35% for each month
                                 thereafter

September 2011 - August 2012      11.00% with respect to September 2011, plus an
                                 additional 1/12th of 0.75% for each month
                                  thereafter

September 2012 and thereafter     11.75%
</TABLE>


                                      -41-

<PAGE>

     Stepdown Trigger Event: With respect to the Certificates on or after the
Stepdown Date, a Distribution Date on which (1) the quotient of (A) the
aggregate Stated Principal Balance of all Mortgage Loans that are 60 or more
days Delinquent measured on a rolling three month basis (including, for the
purposes of this calculation, Mortgage Loans in foreclosure and REO Properties
and Mortgage Loans with respect to which the applicable Mortgagor is in
bankruptcy) and (B) the Stated Principal Balance of the Mortgage Loans as of the
preceding Servicer Remittance Date, equals or exceeds the product of (i) 23.00%
and (ii) the Required Percentage or (2) the quotient (expressed as a percentage)
of (A) the aggregate Realized Losses incurred from the Cut-off Date through the
last day of the calendar month preceding such Distribution Date and (B) the
aggregate principal balance of the Mortgage Loans as of the Cut-off Date exceeds
the Stepdown Required Loss Percentage.

     Sub-Performing Loan: A Mortgage Loan pursuant to which a scheduled monthly
payment in respect of principal and/or interest due prior to the Cut-off Date
under the terms of the related Mortgage Note (or any modification thereto), is
at least 30 but not more than 60 days delinquent.

     Subcontractor: Any outsourcer that performs one or more discrete functions
identified in Item 1122(d) of Regulation AB with respect to 5% or more of the
Mortgage Loans under the direction or authority of a Servicer (measured by
aggregate Stated Principal Balance of the Mortgage Loans, annually at the
commencement of the calendar year prior to the year in which an Assessment of
Compliance is required to be delivered, multiplied by a fraction, the numerator
of which is the number of months during which such Subcontractor performs such
discrete functions and the denominator of which is 12, or, in the case of the
year in which the Closing Date occurs, the number of months elapsed in such
calendar year).

     Subordinate Certificates: The Class M and Class B Certificates.

     Subsequent Recovery: Any amount received on a Mortgage Loan (net of amounts
reimbursed to the Servicer related to Liquidated Mortgage Loans) subsequent to
such Mortgage Loan being determined to be a Liquidated Mortgage Loan.

     Sub-Servicer: Any Person that services Mortgage Loans on behalf of the
Servicer pursuant to a Subservicing Agreement and is responsible for the
performance of the material servicing functions required to be performed by the
Servicer under this Agreement that are identified in Item 1122(d) of Regulation
AB with respect to 10% or more of the Mortgage Loans under the direction or
authority of the Servicer (measured by aggregate Stated Principal Balance of the
Mortgage Loans, annually at the commencement of the calendar year prior to the
year in which an Assessment of Compliance is required to be delivered,
multiplied by a fraction, the numerator of which is the number of months during
which such Subservicer services the related Mortgage Loans and the denominator
of which is 12, or, in the case of the year in which the Closing Date occurs,
the number of months elapsed in such calendar year). Any subservicer shall meet
the qualifications set forth in Section 3.02.

     Subservicing Agreement: As defined in Section 3.02(a).

     Substitution Adjustment Amount: The meaning ascribed to such term pursuant
to Section 2.03(c).


                                      -42-

<PAGE>

     Supplemental Interest Trust: The separate trust, established pursuant to
Section 4.04(l) of this Agreement and held by the Trustee for the benefit of the
holders of the Certificates as a segregated subtrust of the Trust Fund, (i) in
which the Cap Contract and the Swap Agreement will be held, certain
distributions to Certificateholders will be made, any Swap Termination Payments
or Net Swap Payments received from the Swap Counterparty will be deposited as
set forth in Section 4.04 hereof and (ii) out of which any Swap Termination
Payments or Net Swap Payments owed to the Swap Counterparty will be paid.

     Swap Agreement: The confirmation to the master agreement, dated as of March
9, 2006, between the Swap Counterparty and the trustee of the Supplemental
Interest Trust for the benefit of the Certificateholders or any other cap
agreement or swap agreement (including any related schedules) held by the
Supplemental Interest Trust pursuant to Section 4.04(l) hereof.

     Swap Counterparty: Bear Stearns Financial Products Inc. or any successor
counterparty who meets the requirements set forth in the Swap Agreement.

     Swap LIBOR: With respect to any Distribution Date (and the related Accrual
Period) the product of (i) the Floating Rate Option (as defined in the Swap
Agreement for the related Swap Payment Date), (ii) two and (iii) the quotient of
(a) the actual number of days in the Accrual Period for the Lower Tier REMIC
Interests divided by (b) 30.

     Swap Payment Date: For so long as the Swap Agreement is in effect or
amounts remain unpaid thereunder, the Business Day immediately preceding each
Distribution Date.

     SWAP REMIC: As described in the Preliminary Statement and Section 2.07.

     SWAP REMIC Interests: Each of the interests in the SWAP REMIC as set forth
in the Preliminary Statement.

     SWAP REMIC Regular Interests: Each of the SWAP REMIC Interests other than
the Class SWR Interest.

     Swap Termination Payment: Any payment payable by the Supplemental Interest
Trust or the Swap Counterparty upon termination of the Swap Agreement.

     Tax Matters Person: The Person designated as "tax matters person" in the
manner provided under Treasury regulation Section 1.860F-4(d) and Treasury
regulation Section 301.6231(a)(7)-1.

     Transfer: Any direct or indirect transfer or sale of any Ownership Interest
in a Certificate.

     Trust Fund: The corpus of the Issuing Entity (the "Merrill Lynch Mortgage
Investors Trust, Series 2006-SD1") created hereunder consisting of (i) the
Mortgage Loans and all interest and principal received on or with respect
thereto on and after the Cut-off Date to the extent not applied in computing the
Cut-off Date Principal Balance thereof, exclusive of interest not required to be
deposited in the Collection Account; (ii) the Collection Account and the
Certificate Account and all amounts deposited therein pursuant to the applicable
provisions of this Agreement; (iii) property that secured a Mortgage Loan and
has been acquired by foreclosure, deed in lieu of foreclosure or otherwise; (iv)
the mortgagee's rights under the Insurance Policies with respect to the Mortgage
Loans; (v) the right to receive payment in respect of P&I Arrearages; (vi) all
proceeds of the conversion, voluntary or involuntary, of any of the


                                      -43-

<PAGE>

foregoing into cash or other liquid property and (vii) the Supplemental Interest
Trust, which in turn holds the Cap Contract and the Swap Agreement.

     Trustee: LaSalle Bank National Association, a national banking association,
not in its individual capacity, but solely in its capacity as trustee for the
benefit of the Certificateholders under this Agreement, and any successor
thereto, and any corporation or national banking association resulting from or
surviving any consolidation or merger to which it or its successors may be a
party and any successor trustee as may from time to time be serving as successor
trustee hereunder; it being understood that certain duties of the Trustee under
Sections 2.01, 2.02 and 3.13 with respect to the possession and administration
of the Mortgage Files generally may be carried out by a custodian engaged by the
Trustee.

     Uncertificated Class C Interest: An uncertificated REMIC Regular Interest
having the characteristics described in the Preliminary Statement.

     United States Person: (i) A citizen or resident of the United States, (ii)
a corporation, partnership or other entity treated as a corporation or
partnership for federal income tax purposes organized in or under the laws of
the United States or any state thereof or the District of Columbia (unless, in
the case of a partnership, Treasury regulations provide otherwise), (iii) an
estate the income of which is includible in gross income for United States tax
purposes regardless of its source or (iv) a trust if a court within the United
States is able to exercise primary supervision over the administration of the
trust and one or more United States persons have authority to control all
substantial decisions of the trust. Notwithstanding the preceding sentence, to
the extent provided in Treasury regulations, certain trusts in existence on
August 20, 1996, and treated as United States persons prior to such date, that
elect to continue to be treated as United States persons will also be United
States Persons.

     Unpaid Realized Loss Amount: The Class M-1 Unpaid Realized Loss Amount,
Class M-2 Unpaid Realized Loss Amount, Class M-3 Unpaid Realized Loss Amount,
Class B Unpaid Realized Loss Amount and Class C Unpaid Realized Loss Amount,
collectively.

     Upper Tier REMIC: As described in the Preliminary Statement and Section
2.07.

     Upper Tier REMIC Net WAC Cap: For any Distribution Date, the Net Rate
multiplied, in the case of the Class B Certificates, by the actual number of
days in the Accrual Period for the LIBOR Certificates and divided by 30.

     USAP Report: A report in compliance with the Uniform Single Attestation
Program for Mortgage Bankers delivered in accordance with Section 3.18.

     Voting Rights: The portion of the voting rights of all the Certificates
that is allocated to any of the Certificates for purposes of the voting
provisions hereunder. Voting Rights allocated to each Class of Certificates
shall be allocated as follows: (1) 98% to the Class A, Class R, Class M and
Class B Certificates, with the allocation among such Certificates to be in
proportion to the Certificate Principal Balance of each Class relative to the
Certificate Principal Balance of all other Classes and (2) each Class of the
Class C and Class P will be allocated 1% of the Voting Rights. Voting Rights
will be allocated among the Certificates of each such Class in accordance with
their respective Percentage Interests.

                                   ARTICLE II


                                       -44-

<PAGE>

                          CONVEYANCE OF MORTGAGE LOANS;
                         REPRESENTATIONS AND WARRANTIES

          SECTION 2.01. Conveyance of Mortgage Loans.

     The Depositor, concurrently with the execution and delivery hereof, does
hereby sell, transfer, assign, set over and convey to the Trustee without
recourse all the right, title and interest of the Depositor in and to the assets
of the Trust Fund. Such assignment includes all interest and principal received
on or with respect to the Mortgage Loans on or after the Cut-off Date (other
than Scheduled Payments due on the Mortgage Loans on or before the Cut-off
Date).

     It is agreed and understood by the Depositor, the Servicer and the Trustee
that it is not intended that any Mortgage Loan be included in the Trust that is,
without limitation, either (i) a "High-Cost Home Loan" as defined in the New
Jersey Home Ownership Act effective November 27, 2003; (ii) a "High-Cost Home
Loan" as defined in the New Mexico Home Loan Protection Act effective January 1,
2004; (iii) a "High-Cost Home Mortgage Loan" as defined in the Massachusetts
Predatory Home Loan Practices Act effective November 7, 2004; (iv) a "High-Cost
Home Loan" as defined by the Indiana High Cost Home Loan Law effective January
1, 2005 or (v) a "High-Cost Home Loan" as defined by the Illinois High Risk Home
Loan Act effective January 1, 2004.

     In connection with such assignment, the Depositor does hereby deliver to,
and deposit with, the Trustee, the following documents or instruments with
respect to each Mortgage Loan:

          (A) The original Mortgage Note endorsed in blank or, "Pay to the order
     of LaSalle Bank National Association, as trustee for Merrill Lynch Mortgage
     Investors Trust, Series 2006-SD1, without recourse" together with all
     riders thereto. The Mortgage Note shall include all intervening
     endorsements and assignments showing a complete chain of the title and
     assignments of all rights of, title to and interest from the originator to
     LaSalle Bank National Association, as Trustee for Merrill Lynch Mortgage
     Investors Trust, Series 2006-SD1.

          (B) Except as provided below and for each Mortgage Loan that is not a
     MERS Loan, the original recorded Mortgage together with all riders thereto,
     with evidence of recording thereon, or, if the original Mortgage has not
     yet been returned from the recording office, a copy of the original
     Mortgage together with all riders thereto certified to be a true copy of
     the original of the Mortgage that has been delivered for recording in the
     appropriate recording office of the jurisdiction in which the Mortgaged
     Property is located and in the case of each MERS Loan, the original
     Mortgage together with all riders thereto, noting the presence of the MIN
     of the Loan and either language indicating that the Mortgage Loan is a MOM
     Loan or if the Mortgage Loan was not a MOM Loan at origination, the
     original Mortgage and the assignment thereof to MERS, with evidence of
     recording indicated thereon, or a copy of the Mortgage certified by the
     public recording office in which such Mortgage has been recorded.

          (C) In the case of each Mortgage Loan that is not a MERS Loan, the
     original Assignment of each Mortgage in blank or, to "LaSalle Bank National
     Association, as trustee."

          (D) The original policy of title insurance (or a preliminary title
     report, commitment or binder if the original title insurance policy has not
     been received from the title insurance company).


                                      -45-

<PAGE>

          (E) Originals of any intervening assignments of the Mortgage, with
     evidence of recording thereon or, if the original intervening assignment
     has not yet been returned from the recording office, a copy of such
     assignment certified to be a true copy of the original of the assignment
     which has been sent for recording in the appropriate jurisdiction in which
     the Mortgaged Property is located.

          (F) Originals of all assumption and modification agreements, if any.

          (G) If in connection with any Mortgage Loan, the Depositor cannot
     deliver the Mortgage, Assignments of Mortgage or assumption, consolidation
     or modification, as the case may be, with evidence of recording thereon, if
     applicable, concurrently with the execution and delivery of this Agreement
     solely because of a delay caused by the public recording office where such
     Mortgage, Assignments of Mortgage or assumption, consolidation or
     modification, as the case may be, has been delivered for recordation, the
     Depositor shall deliver or cause to be delivered to the Trustee written
     notice stating that such Mortgage or assumption, consolidation or
     modification, as the case may be, has been delivered to the appropriate
     public recording office for recordation. Thereafter, the Depositor shall
     deliver or cause to be delivered to the Trustee such Mortgage, Assignments
     of Mortgage or assumption, consolidation or modification, as the case may
     be, with evidence of recording indicated thereon, if applicable, upon
     receipt thereof from the public recording office. To the extent any
     required endorsement is not contained on a Mortgage Note or an Assignment
     of Mortgage, the Depositor shall make or cause to be made such endorsement.

          (H) With respect to any Mortgage Loan, none of the Depositor, the
     Servicer or the Trustee shall be obligated to cause to be recorded the
     Assignment of Mortgage referred to in this Section 2.01. In the event an
     Assignment of Mortgage is not recorded, the Servicer shall have no
     liability for its failure to receive and act on notices related to such
     Assignment of Mortgage.

     The ownership of each Mortgage Note, the Mortgage and the contents of the
related Mortgage File is vested in the Trustee on behalf of the
Certificateholders. Neither the Depositor nor the Servicer shall take any action
inconsistent with such ownership and shall not claim any ownership interest
therein. The Depositor and the Servicer shall respond to any third party
inquiries with respect to ownership of the Mortgage Loans by stating that such
ownership is held by the Trustee on behalf of the Certificateholders. Mortgage
documents relating to the Mortgage Loans not delivered to the Trustee are and
shall be held in trust by the Servicer, for the benefit of the Trustee as the
owner thereof, and the Servicer's possession of the contents of each Mortgage
File so retained is for the sole purpose of servicing the related Mortgage Loan,
and such retention and possession by the Servicer, is in a custodial capacity
only. The Depositor agrees to take no action inconsistent with the Trustee's
ownership of the Mortgage Loans, to promptly indicate to all inquiring parties
that the Mortgage Loans have been sold and to claim no ownership interest in the
Mortgage Loans.

     It is the intention of this Agreement that the conveyance of the
Depositor's right, title and interest in and to the Trust Fund pursuant to this
Agreement shall constitute a purchase and sale and not a loan. If a conveyance
of Mortgage Loans from the Sponsor to the Depositor is characterized as a pledge
and not a sale, then the Depositor shall be deemed to have transferred to the
Trustee all of the Depositor's right, title and interest in, to and under the
obligations of the Sponsor deemed to be secured by said pledge; and it is the
intention of this Agreement that the Depositor shall also be deemed to have
granted to the Trustee a first priority security interest in all of the
Depositor's right, title, and interest in, to and under the


                                       -46-

<PAGE>

obligations of the Sponsor to the Depositor deemed to be secured by said pledge
and that the Trustee shall be deemed to be an independent custodian for purposes
of perfection of the security interest granted to the Depositor. If the
conveyance of the Mortgage Loans from the Depositor to the Trustee is
characterized as a pledge, it is the intention of this Agreement that this
Agreement shall constitute a security agreement under applicable law, and that
the Depositor shall be deemed to have granted to the Trustee a first priority
security interest in all of the Depositor's right, title and interest in, to and
under the Mortgage Loans, all payments of principal of or interest on such
Mortgage Loans, all other rights relating to and payments made in respect of the
Trust Fund, and all proceeds of any thereof. If the trust created by this
Agreement terminates prior to the satisfaction of the claims of any Person in
any Certificates, the security interest created hereby shall continue in full
force and effect and the Trustee shall be deemed to be the collateral agent for
the benefit of such Person.

     In addition to the conveyance made in the first paragraph of this Section
2.01, the Depositor does hereby convey, assign and set over to the Trustee for
the benefit of the Certificateholders its rights and interests under the Sale
Agreement, including the Depositor's right, title and interest in the
representations and warranties contained in the Sale Agreement and the benefit
of the repurchase obligations and the obligation of the Sponsor contained in the
Sale Agreement to take, at the request of the Depositor or the Trustee, all
action on its part which is reasonably necessary to ensure the enforceability of
a Mortgage Loan. The Trustee hereby accepts such assignment, and shall be
entitled to exercise all rights of the Depositor under the Sale Agreement as if,
for such purpose, it were the Depositor. The foregoing sale, transfer,
assignment, set-over, deposit and conveyance does not and is not intended to
result in creation or assumption by the Trustee of any obligation of the
Depositor, the Sponsor, or any other Person in connection with the Mortgage
Loans or any other agreement or instrument relating thereto.

          SECTION 2.02. Acceptance by the Trustee of the Mortgage Loans.

     Except as set forth in the exception report delivered contemporaneously
herewith (the "Exception Report"), the Trustee acknowledges receipt of the
Mortgage Note for each Mortgage Loan and delivery of a Mortgage File (but does
not acknowledge receipt of all documents required to be included in such
Mortgage File) with respect to each Mortgage Loan and declares that it holds and
will hold such documents and any other documents constituting a part of the
Mortgage Files delivered to it in trust for the use and benefit of all present
and future Certificateholders. The Depositor will cause the Sponsor to
repurchase any Mortgage Loan to which a material exception was taken in the
Exception Report unless such exception is cured to the satisfaction of the
Trustee within 45 Business Days of the Closing Date.

     The Trustee acknowledges receipt of the Cap Contract (the form of which is
attached hereto as Exhibit N) and the Sale Agreement.

     The Trustee acknowledges receipt of the Swap Agreement that will be held in
the Supplemental Interest Trust and is hereby instructed to enter into the Swap
Agreement, not in its individual capacity, but solely as Trustee for the
Supplemental Interest Trust. The Trustee is hereby instructed to enter into the
payment instruction agreement dated as of September 12, 2006, by and among
Merrill Lynch, Pierce, Fenner & Smith Incorporated, Waterfall Eden Master Fund
Ltd. and LaSalle Bank National Association.

     The Trustee agrees, for the benefit of Certificateholders, to review each
Mortgage File delivered to it within 60 days after the Closing Date. The Trustee
will ascertain and to certify, within 70 days of the Closing Date, to the
Depositor and the Servicer that all documents required by Section 2.01 (A)-(B),
(C) (if applicable), and (D)-(E), and the documents if actually received by it,
under Section 2.01(F), have


                                      -47-

<PAGE>

been executed and received, and that such documents relate to the Mortgage Loans
identified in Exhibit B-1 that have been conveyed to it. It is herein
acknowledged that, in conducting such review, the Trustee shall not be under any
duty or obligation to inspect, review or examine any such documents,
instruments, certificates or other papers to determine that they are genuine,
enforceable or appropriate for the represented purpose, that they have actually
been recorded or that they are other than what they purport to be on their face.
If the Trustee finds any document or documents constituting a part of a Mortgage
File to be missing or defective (that is, mutilated, damaged, defaced or
unexecuted) in any material respect, the Trustee shall promptly (and in any
event within no more than five Business Days) after such finding so notify the
Servicer, the Sponsor and the Depositor. In addition, the Trustee shall also
notify the Servicer, the Sponsor and the Depositor if the original Mortgage with
evidence of recording thereon with respect to a Mortgage Loan is not received
within 70 days of the Closing Date; if it has not been received because of a
delay caused by the public recording office where such Mortgage has been
delivered for recordation, the Depositor shall deliver or cause to be delivered
to the Trustee written notice stating that such Mortgage has been delivered to
the appropriate public recording office for recordation and thereafter the
Depositor shall deliver or cause to be delivered such Mortgage with evidence of
recording thereon upon receipt thereof from the public recording office. The
Trustee shall request that the Sponsor correct or cure such omission, defect or
other irregularity, or substitute a Mortgage Loan pursuant to the provisions of
Section 2.03(c), within 90 days from the date the Sponsor was notified of such
omission or defect and, if the Sponsor does not correct or cure such omission or
defect within such period, that the Sponsor purchase such Mortgage Loan from the
Issuing Entity within 90 days from the date the Trustee notified the Sponsor of
such omission, defect or other irregularity at the Purchase Price of such
Mortgage Loan. The Purchase Price for any Mortgage Loan purchased pursuant to
this Section 2.02 shall be paid to the Servicer and deposited by the Servicer in
the Certificate Account or Collection Account, as appropriate, promptly upon
receipt, and upon receipt by the Trustee of written notification of such deposit
signed by a Servicing Officer or receipt of such deposit by the Trustee or the
Trustee, upon receipt of a Request for Release and certification of the Servicer
of such required deposit, shall promptly release to the Sponsor the related
Mortgage File and the Trustee shall execute and deliver such instruments of
transfer or assignment, without recourse, as shall be requested by the Sponsor
and necessary to vest in the Sponsor or its designee, as the case may be, any
Mortgage Loan released pursuant hereto, and the Trustee shall have no further
responsibility with regard to such Mortgage Loan. It is understood and agreed
that the obligation of the Sponsor to purchase, cure or substitute any Mortgage
Loan as to which a material defect in or omission of a constituent document
exists shall constitute the sole remedy respecting such defect or omission
available to the Trustee on behalf of Certificateholders. The preceding sentence
shall not, however, limit any remedies available to the Certificateholders, the
Depositor or the Trustee pursuant to the Sale Agreement. The Trustee shall be
under no duty or obligation to inspect, review and examine such documents,
instruments, certificates or other papers to determine that they are genuine,
enforceable, recordable, duly authorized, sufficient, legal, valid or
appropriate to the represented purpose, or that they have actually been
recorded, or that they are other than what they purport to be on their face. The
Servicer and the Trustee shall keep confidential the name of each Mortgagor
except as required for the performance of this Agreement and the Servicer and
the Trustee shall not solicit any such Mortgagor for the purpose of refinancing
the related Mortgage Loan; notwithstanding anything herein to the contrary, the
foregoing shall not be construed to prohibit (i) disclosure of any and all
information that is or becomes publicly known, or information obtained by the
Trustee or the Servicer from sources other than the other parties hereto, (ii)
disclosure of any and all information (A) if required to do so by any applicable
law, rule or regulation, (B) to any government agency or regulatory body having
or claiming authority to regulate or oversee any aspects of the business of the
Trustee or the Servicer or that of any Affiliate, (C) pursuant to any subpoena,
civil investigation demand or similar demand or request of any court, regulatory
authority, arbitrator or arbitration to which the Trustee or the Servicer or any
Affiliate or an


                                      -48-

<PAGE>

officer, director, employer or shareholder thereof is a party or (D) to any
Affiliate, independent or internal auditor, agent, employee or attorney of the
Trustee or the Servicer having a need to know the same, provided that the
Trustee or the Servicer, as applicable, advises such recipient of the
confidential nature of the information being disclosed, or (iii) any other
disclosure authorized by the Depositor.

     Within 70 days of the Closing Date, the Trustee shall deliver the Depositor
and the Servicer the Trustee's Certification, substantially in the form of
Exhibit D attached hereto, evidencing the completeness of the Mortgage Files,
with any exceptions noted thereto.

          SECTION 2.03. Representations, Warranties and Covenants of the
     Depositor.

          (a) The Depositor hereby represents and warrants to the Servicer and
the Trustee as follows, as of the date hereof:

          (i) The Depositor is duly organized and is validly existing as a
     corporation in good standing under the laws of the State of Delaware and
     has full power and authority (corporate and other) necessary to own or hold
     its properties and to conduct its business as now conducted by it and to
     enter into and perform its obligations under this Agreement and the Sale
     Agreement.

          (ii) The Depositor has the full corporate power and authority to
     execute, deliver and perform, and to enter into and consummate the
     transactions contemplated by, this Agreement and the Sale Agreement and has
     duly authorized, by all necessary corporate action on its part, the
     execution, delivery and performance of this Agreement and the Sale
     Agreement; and this Agreement and the Sale Agreement, assuming the due
     authorization, execution and delivery hereof by the other parties hereto,
     constitutes a legal, valid and binding obligation of the Depositor,
     enforceable against the Depositor in accordance with its terms, subject, as
     to enforceability, to (i) bankruptcy, insolvency, reorganization,
     moratorium and other similar laws affecting creditors' rights generally and
     (ii) general principles of equity, regardless of whether enforcement is
     sought in a proceeding in equity or at law.

          (iii) The execution and delivery of this Agreement and the Sale
     Agreement by the Depositor, the consummation of the transactions
     contemplated by this Agreement and the Sale Agreement, and the fulfillment
     of or compliance with the terms hereof are in the ordinary course of
     business of the Depositor and will not (A) result in a material breach of
     any term or provision of the charter or by-laws of the Depositor or (B)
     materially conflict with, result in a violation or acceleration of, or
     result in a material default under, the terms of any other material
     agreement or instrument to which the Depositor is a party or by which it
     may be bound or (C) constitute a material violation of any statute, order
     or regulation applicable to the Depositor of any court, regulatory body,
     administrative agency or governmental body having jurisdiction over the
     Depositor; and the Depositor is not in breach or violation of any material
     indenture or other material agreement or instrument, or in violation of any
     statute, order or regulation of any court, regulatory body, administrative
     agency or governmental body having jurisdiction over it which breach or
     violation may materially impair the Depositor's ability to perform or meet
     any of its obligations under this Agreement.

          (iv) No litigation is pending, or, to the best of the Depositor's
     knowledge, threatened, against the Depositor that would materially and
     adversely affect the execution, delivery or enforceability of this
     Agreement and the Sale Agreement or the ability of the Depositor to


                                       -49-

<PAGE>

     perform its obligations under this Agreement and the Sale Agreement in
     accordance with the terms hereof.

          (v) No consent, approval, authorization or order of any court or
     governmental agency or body is required for the execution, delivery and
     performance by the Depositor of, or compliance by the Depositor with, this
     Agreement and the Sale Agreement or the consummation of the transactions
     contemplated hereby, or if any such consent, approval, authorization or
     order is required, the Depositor has obtained the same. The Depositor
     hereby represents and warrants to the Trustee with respect to each Mortgage
     Loan as of the Closing Date, and following the transfer of the Mortgage
     Loans to it by the Sponsor, the Depositor had good title to the Mortgage
     Loans and the Mortgage Notes were subject to no offsets, claims, liens,
     mortgage, pledge, charge, security interest, defenses or counterclaims.

          (b) The representations and warranties of the Sponsor with respect to
the Mortgage Loans contained in the Sale Agreement were made as of the Closing
Date. To the extent that any fact, condition or event with respect to a Mortgage
Loan constitutes a breach of a representation or warranty of the Sponsor under
the Sale Agreement, the only right or remedy of the Trustee or any
Certificateholder shall be the Trustee' right to enforce the obligations of the
Seller under any applicable representation or warranty made by it. The Trustee
acknowledges that the Depositor shall have no obligation or liability with
respect to any breach of any representation or warranty with respect to the
Mortgage Loans (except as set forth in Section 2.03(a)(v)) under any
circumstances.

          (c) Upon discovery by any of the Depositor, the Servicer or the
Trustee (or its custodian) of a breach of any of such representations and
warranties set forth in the Sale Agreement that adversely and materially affects
the value of the related Mortgage Loan, Prepayment Charges or the interests of
the Certificateholders, the party discovering such breach shall give prompt
written notice to the other parties. Within 90 days of the discovery of such
breach of any representation or warranty, the Sponsor shall either (a) cure such
breach in all material respects, (b) repurchase such Mortgage Loan or any
property acquired in respect thereof from the Trustee at the Purchase Price or
(c) within the two year period following the Closing Date, substitute a
Replacement Mortgage Loan for the affected Mortgage Loan. In the event of
discovery of a breach of any representation and warranty of the Sponsor, the
Trustee shall enforce its rights under the Sale Agreement for the benefit of
Certificateholders. If a breach of the representations and warranties set forth
in the Sale Agreement exists solely due to the unenforceability of a Prepayment
Charge, the Trustee or the other party having notice thereof shall notify the
Servicer thereof and not seek to enforce the repurchase remedy provided for
herein unless such Mortgage Loan is not current. In the event of a breach of the
representations and warranties with respect to the Mortgage Loans set forth in
the Sale Agreement, the Trustee shall enforce the right of the Issuing Entity to
be indemnified for such breach of representation and warranty. In the event that
such breach relates solely to the unenforceability of a Prepayment Charge,
amounts received in respect of such indemnity up to the amount of such
Prepayment Charge shall be distributed pursuant to Section 4.04(b)(i). As
provided in the Sale Agreement, if the Sponsor substitutes for a Mortgage Loan
for which there is a breach of any representations and warranties in the Sale
Agreement which adversely and materially affects the value of such Mortgage Loan
and such substitute mortgage loan is not a Replacement Mortgage Loan, under the
terms of the Sale Agreement, the Sponsor will, in exchange for such substitute
Mortgage Loan, (i) provide the applicable Purchase Price for the affected
Mortgage Loan or (ii) within two years of the Closing Date, substitute such
affected Mortgage Loan with a Replacement Mortgage Loan. Any such substitution
shall not be effected prior to the additional delivery to the Trustee of a
Request for Release substantially in the form of Exhibit I and shall not be
effected unless it is within


                                      -50-

<PAGE>

two years of the Startup Day. The Sponsor indemnifies and holds the Issuing
Entity, the Trustee (or its custodian, as applicable), the Depositor, the
Servicer and each Certificateholder harmless against any and all taxes, claims,
losses, penalties, fines, forfeitures, reasonable legal fees and related costs,
judgments, and any other costs, fees and expenses that the Issuing Entity, the
Trustee (or its custodian, as applicable), the Depositor, the Servicer and any
Certificateholder may sustain in connection with any actions of the Sponsor
relating to a repurchase of a Mortgage Loan other than in compliance with the
terms of this Section 2.03 and the Sale Agreement, to the extent that any such
action causes (i) any federal or state tax to be imposed on the Issuing Entity
or any REMIC provided for herein, including without limitation, any federal tax
imposed on "prohibited transactions" under Section 860F(a)(1) of the Code or on
"contributions after the startup day" under Section 860G(d)(1) of the Code, or
(ii) any REMIC created hereunder to fail to qualify as a REMIC at any time that
any Certificate is outstanding. In furtherance of the foregoing, if the Sponsor
is not a member of MERS and repurchases a Mortgage Loan which is registered on
the MERS System, the Sponsor, at its own expense and without any right of
reimbursement, shall cause MERS to execute and deliver an assignment of the
Mortgage in recordable form to transfer the Mortgage from MERS to the Sponsor
and shall cause such Mortgage to be removed from registration on the MERS System
in accordance with MERS' rules and regulations.

     With respect to any Mortgage Loan repurchased by the Sponsor pursuant to
the Sale Agreement, the principal portion of the funds received by the Servicer
in respect of such repurchase of a Mortgage Loan will be considered a Principal
Prepayment and shall be deposited in the Certificate Account pursuant to Section
3.05. Upon receipt by the Trustee of notice from the Servicer of receipt by the
Servicer of the full amount of the Purchase Price for a Deleted Mortgage Loan,
and upon receipt by the Trustee of the Mortgage File for a Replacement Mortgage
Loan substituted for a Deleted Mortgage Loan and a Request for Release, the
Trustee shall release and reassign to the Sponsor the related Mortgage File for
the Deleted Mortgage Loan and shall execute and deliver such instruments of
transfer or assignment, in each case without recourse, representation or
warranty, as shall be necessary to vest in such party or its designee or
assignee title to any Deleted Mortgage Loan released pursuant hereto, free and
clear of all security interests, liens and other encumbrances created by this
Agreement, which instruments shall be prepared by the Depositor, the Sponsor and
the Trustee (and its custodian) shall have no further responsibility with
respect to the Mortgage File relating to such Deleted Mortgage Loan.

     With respect to each Replacement Mortgage Loan to be delivered to the
Trustee pursuant to the terms of this Article II in exchange for a Deleted
Mortgage Loan: (i) the Sponsor must deliver to the Trustee the Mortgage File for
the Replacement Mortgage Loan containing the documents set forth in Section 2.01
along with a written certification certifying as to the Mortgage Loan satisfying
all requirements under the definition of Replacement Mortgage Loan and the
delivery of such Mortgage File and containing the granting language set forth in
Section 2.01; and (ii) the Depositor will be deemed to have made, with respect
to such Replacement Mortgage Loan, each of the representations and warranties
made by it with respect to the related Deleted Mortgage Loan. The Trustee shall
review the Mortgage File with respect to each Replacement Mortgage Loan and
certify to the Depositor that all documents required by Section 2.01(A)-(B), (C)
(if applicable), and (D)-(E) have been executed and received.

     For any month in which the Sponsor substitutes one or more Replacement
Mortgage Loans for one or more Deleted Mortgage Loans, the Sponsor will
determine the amount (if any) by which the aggregate principal balance of all
such Replacement Mortgage Loans as of the date of substitution and the aggregate
Prepayment Charges with respect to such Replacement Mortgage Loans is less than
the aggregate Stated Principal Balance (after application of the principal
portion of the Scheduled Payment due in the month of substitution) and aggregate
Prepayment Charges of all such Deleted Mortgage Loans.


                                      -51-

<PAGE>

An amount equal to the aggregate of the deficiencies described in the preceding
sentence (such amount, the "Substitution Adjustment Amount") plus an amount
equal to any unreimbursed costs, penalties and/or damages incurred by the
Issuing Entity in connection with any violation relating to such Deleted
Mortgage Loan of any predatory or abusive lending law shall be remitted by the
Sponsor to the Trustee for deposit into the Certificate Account by the Sponsor
on the Determination Date for the Distribution Date relating to the Prepayment
Period during which the related Mortgage Loan became required to be purchased or
replaced hereunder.

     Notwithstanding any other provision of this Agreement, the right to
substitute Mortgage Loans pursuant to this Article II shall be subject to the
additional limitations that no substitution of a Replacement Mortgage Loan for a
Deleted Mortgage Loan shall be made unless the Trustee shall have received an
Opinion of Counsel (at the expense of the party seeking to make the
substitution) that, under current law, such substitution will not (A) affect
adversely the status of any REMIC established hereunder as a REMIC, or of the
related "regular interests" as "regular interests" in any such REMIC, or (B)
cause any such REMIC to engage in a "prohibited transaction" or prohibited
contribution pursuant to the REMIC Provisions.

     The Depositor shall amend the Mortgage Loan Schedule to reflect the removal
of such Deleted Mortgage Loan from the terms of this Agreement and the
substitution of the Replacement Mortgage Loan or Replacement Mortgage Loans.
Upon such substitution by the Sponsor, such Replacement Mortgage Loan or
Replacement Mortgage Loans shall constitute part of the Mortgage Pool and shall
be subject in all respects to the terms of this Agreement and the applicable
Sale Agreement, including all applicable representations and warranties thereof
included in the applicable Sale Agreement as of the date of substitution.

          (d) It is understood and agreed that the representations, warranties
and indemnification (i) set forth in this Section 2.03 and (ii) of the Sponsor
and the Depositor set forth in the Sale Agreement and assigned to the Trustee by
the Depositor hereunder shall each survive delivery of the Mortgage Files and
the Assignment of Mortgage of each Mortgage Loan to the Trustee and shall
continue throughout the term of this Agreement.

          (e) The Depositor shall deliver a copy of the Mortgage Loan Schedule
to the Servicer on the Closing Date.

          (f) The Depositor shall notify the Servicer and the Trustee when any
NIM Notes are issued and when such NIM Notes are no longer outstanding.

           SECTION 2.04. Representations and Warranties of the Servicer.

          The Servicer hereby represents and warrants to the Depositor and the
Trustee as follows, as of the date hereof:

          (i) The Servicer is duly organized and is validly existing as a
     corporation in good standing under the laws of the State of Nevada and is
     duly authorized and qualified to transact any and all business contemplated
     by this Agreement to be conducted by the Servicer in any state in which a
     Mortgaged Property is located or is otherwise not required under applicable
     law to effect such qualification and, in any event, is in compliance with
     the doing business laws of any such state, to the extent necessary to
     ensure its ability to enforce each Mortgage Loan, to service


                                      -52-

<PAGE>

     the Mortgage Loans in accordance with the terms of this Agreement and to
     perform any of its other obligations under this Agreement in accordance
     with the terms hereof.

          (ii) The Servicer has the corporate power and authority to service
     each Mortgage Loan, and to execute, deliver and perform, and to enter into
     and consummate the transactions contemplated by this Agreement and has duly
     authorized by all necessary corporate action on the part of the Servicer
     the execution, delivery and performance of this Agreement; and this
     Agreement, assuming the due authorization, execution and delivery hereof by
     the other parties hereto, constitutes a legal, valid and binding obligation
     of the Servicer, enforceable against the Servicer in accordance with its
     terms, except that (a) the enforceability hereof may be limited by
     bankruptcy, insolvency, moratorium, receivership and other similar laws
     relating to creditors' rights generally and (b) the remedy of specific
     performance and injunctive and other forms of equitable relief may be
     subject to equitable defenses and to the discretion of the court before
     which any proceeding therefor may be brought.

          (iii) The execution and delivery of this Agreement by the Servicer,
     the servicing of the Mortgage Loans under this Agreement, the consummation
     of any other of the transactions contemplated by this Agreement, and the
     fulfillment of or compliance with the terms hereof are in the ordinary
     course of business of the Servicer and will not (A) result in a material
     breach of any term or provision of the charter or by-laws of the Servicer
     or (B) materially conflict with, result in a material breach, violation or
     acceleration of, or result in a material default under, the terms of any
     other material agreement or instrument to which the Servicer is a party or
     by which it may be bound, or (C) constitute a material violation of any
     statute, order or regulation applicable to the Servicer of any court,
     regulatory body, administrative agency or governmental body having
     jurisdiction over the Servicer; and the Servicer is not in breach or
     violation of any material indenture or other material agreement or
     instrument, or in violation of any statute, order or regulation of any
     court, regulatory body, administrative agency or governmental body having
     jurisdiction over it which breach or violation may materially impair the
     Servicer's ability to perform or meet any of its obligations under this
     Agreement.

          (iv) The Servicer is an approved servicer of mortgage loans for Fannie
     Mae and is an approved servicer of mortgage loans for Freddie Mac.

          (v) No litigation is pending or, to the best of the Servicer's
     knowledge, threatened, against the Servicer that would materially and
     adversely affect the execution, delivery or enforceability of this
     Agreement or the ability of the Servicer to service the Mortgage Loans or
     to perform any of its other obligations under this Agreement in accordance
     with the terms hereof.

          (vi) No consent, approval, authorization or order of any court or
     governmental agency or body is required for the execution, delivery and
     performance by the Servicer of, or compliance by the Servicer with, this
     Agreement or the consummation of the transactions contemplated hereby, or
     if any such consent, approval, authorization or order is required, the
     Servicer has obtained the same.

          (vii) The Servicer has fully furnished and will fully furnish (for the
     period it serviced the Mortgage Loans), in accordance with the Fair Credit
     Reporting Act and its implementing regulations, accurate and complete
     information (e.g., favorable and unfavorable) on its borrower


                                      -53-

<PAGE>

     credit files to Equifax, Experian and Trans Union Credit Information
     Company on a monthly basis.

          SECTION 2.05. Substitutions and Repurchases of Mortgage Loans that are
     not "Qualified Mortgages".

     Upon discovery by the Depositor, the Servicer or the Trustee that any
Mortgage Loan does not constitute a "qualified mortgage" within the meaning of
section 860G(a)(3) of the Code, the party discovering such fact shall promptly
(and in any event within five Business Days of discovery) give written notice
thereof to the other parties. In connection therewith, the Depositor shall, at
the Depositor's option, either (i) substitute, if the conditions in Section
2.03(c) with respect to substitutions are satisfied, a Replacement Mortgage Loan
for the affected Mortgage Loan, or (ii) repurchase the affected Mortgage Loan
within 90 days of such discovery in the same manner as it would a Mortgage Loan
for a breach of representation or warranty contained in Section 2.03. The
Trustee, upon the written direction of the Depositor, shall reconvey to the
Depositor the Mortgage Loan to be released pursuant hereto in the same manner,
and on the same terms and conditions, as it would a Mortgage Loan repurchased
for breach of a representation or warranty contained in Section 2.03.

          SECTION 2.06. Authentication and Delivery of Certificates.

     The Trustee acknowledges the transfer and assignment to it of the Trust
Fund and, concurrently with such transfer and assignment, the Trustee has caused
to be authenticated and delivered to or upon the order of the Depositor, in
exchange for the Mortgage Loans, Certificates duly authenticated by the
Authenticating Agent in authorized denominations evidencing ownership of the
entire Trust Fund. The Trustee agrees to hold the Trust Fund and exercise the
rights referred to above for the benefit of all present and future Holders of
the Certificates and to perform its duties set forth in this Agreement in
accordance with the provisions hereof.

          SECTION 2.07. REMIC Elections.

          (a) The Depositor hereby instructs and authorizes the Trustee to make
an appropriate election to treat each of the Upper Tier REMIC, the Lower Tier
REMIC and the SWAP REMIC as a REMIC. The Trustee shall sign the returns
providing for such elections and such other tax or information returns that are
required to be signed by the Trustee under applicable law. This Agreement shall
be construed so as to carry out the intention of the parties that each of the
Upper Tier REMIC, the Lower Tier REMIC and the SWAP REMIC be treated as a REMIC
at all times prior to the date on which the Trust Fund is terminated.

          (b) The Preliminary Statement sets forth the designations and "latest
possible maturity date" for federal income tax purposes of all interests created
hereby. The "Startup Day" for purposes of the REMIC Provisions shall be the
Closing Date. Each REMIC's fiscal year shall be the calendar year.

     The SWAP REMIC shall consist of all of the assets of the Trust Fund, other
than (i) amounts distributable to the Class P Certificates pursuant to Section
4.04(b)(i) hereof, (ii) the interests issued by the SWAP REMIC and the interests
issued by the Lower Tier REMIC, (iii) the grantor trusts described in Section
2.07 hereof, (iv) amounts collected in respect of Collectable Arrearages and P&I
Arrearages, (v) the Cap Contract and (vi) the Swap Agreement and the
Supplemental Interest Trust. The SWAP REMIC


                                      -54-

<PAGE>

shall issue the SWAP REMIC Regular Interests, which shall be designated as
regular interests of such REMIC, and shall issue the Class SWR Interest, which
shall be designated as the sole class of residual interest in the SWAP REMIC.
Each of the SWAP REMIC Regular Interests shall have the characteristics set
forth in the Preliminary Statement and this Section 2.07.

     The Lower Tier REMIC shall consist of the SWAP REMIC Regular Interests. The
Lower Tier REMIC shall issue the Lower Tier REMIC Regular Interests, which shall
be designated as regular interests of such REMIC and shall issue the Class LTR
Interest, which shall be designated as the sole class of residual interest in
the Lower Tier REMIC. Each of the Lower Tier REMIC Regular Interests shall have
the characteristics set forth in its definition and the Preliminary Statement.

     The assets of the Upper Tier REMIC shall be the Lower Tier REMIC Regular
Interests. The REMIC Regular Interests shall be designated as the regular
interests in the Upper Tier REMIC and the Residual Interest shall be designated
as the sole class of residual interest in the Upper Tier REMIC. For federal
income tax purposes, the pass-through rate on each REMIC Regular Interest (other
than the Uncertificated Class C Interest and the Class UT-IO Interest) and on
the sole class of residual interest in the Upper Tier REMIC shall be subject to
a cap equal to the Upper Tier REMIC Net WAC Cap.

     The beneficial ownership of the Class SWR Interest, Class LTR Interest and
the Residual Interest shall be represented by the Class R Certificate. The Class
SWR Interest and Class LTR Interest shall not have a principal balance or bear
interest.

          (c) The "tax matters person" with respect to each REMIC for purposes
of the REMIC Provisions shall be the beneficial owner of the Class R
Certificate; provided, however, that the Holder of the Class R Certificate, by
its acceptance thereof, irrevocably appoints the Trustee as its agent and
attorney-in-fact to act as "tax matters person" with respect to each such REMIC
for purposes of the REMIC Provisions. If there is more than one beneficial owner
of the Class R Certificate, the "tax matters person" shall be the Person with
the greatest percentage interest in the Class R Certificate and, if there is
more than one such Person, shall be determined under Treasury regulation Section
1.860F-4(d) and Treasury regulation Section 301.6231(a)(7)-1.

          (d) (i) It is intended that the rights of each Class of the Class A,
Class R, Class M and Class B Certificates to receive payments in respect of
Excess Interest shall be treated as a right in interest rate cap contracts
written by the Class C Certificateholders in favor of the holders of each Class
of the Class A, Class R, Class M and Class B Certificates and such shall be
accounted for as property held separate and apart from the regular interests in
the Upper Tier REMIC held by the holders of the Class A Certificates, Class M
Certificates, Class B Certificates and the residual interest in the Upper Tier
REMIC held by the holder of the Class R Certificate. For information reporting
requirements, the rights of the Class A, Class R, Class M and Class B
Certificates to receive payments in respect of Excess Interest shall be assumed
to have zero or a de minimis value. This provision is intended to satisfy the
requirements of Treasury Regulations Section 1.860G-2(i) for the treatment of
property rights coupled with REMIC interests to be separately respected and
shall be interpreted consistently with such regulation. On each Distribution
Date, to the extent that any of the Class A, Class R, Class M and Class B
Certificates receive payments in respect of Excess Interest, such amounts, to
the extent not derived from payments on the Cap Contract, the Swap Agreement or
amounts collected in respect of P&I Arrearages, will be treated as distributed
by the Upper Tier REMIC to the Class C Certificates pro rata in payment of the
amounts specified in Section 4.04(g) and then paid to the relevant Class of
Certificates pursuant to the related interest rate cap agreement.


                                      -55-
<PAGE>

          (ii) It is intended that the beneficial owners of the Certificates
(other than the Class P and Class C Certificates) shall be treated as having
entered into a notional principal contract with respect to the beneficial owners
of the Class C Certificates. Pursuant to each such notional principal contract,
all beneficial owners of each Class of Certificates (other than the Class P and
Class C Certificates) shall be treated as having agreed to pay, on each
Distribution Date, to the beneficial owners of the Class C Certificates an
aggregate amount equal to the excess, if any, of (i) the amount payable on such
Distribution Date on the Corresponding REMIC Regular Interest of such Class of
Certificates over (ii) the amount payable on such Class of Certificates on such
Distribution Date (such excess, a "Class Payment Shortfall"). A Class Payment
Shortfall shall be allocated to each Class of Certificates to the extent that
interest accrued on such Class for the related Accrual Period at the
Pass-Through Rate for a Class, computed by substituting "Upper Tier REMIC Net
WAC Cap" for the Available Funds Cap set forth in the definition thereof,
exceeds the amount of interest accrued on such Certificate at the Pass-Through
Rate (without such substitution) for the related Accrual Period, and a Class
Payment Shortfall payable from principal collections shall be allocated to the
most subordinate Class of Certificates with an outstanding principal balance to
the extent of such balance.

          (e) The parties intend that the portion of the Trust Fund consisting
of the Uncertificated Class C Interest, the uncertificated Class UT-IO Interest,
the rights to receive payments deemed made by the Class A, Class R, Class M and
Class B Certificates in respect of notional principal contracts described in
Section 2.07(d)(ii), the Supplemental Interest Trust which holds the Swap
Agreement, the Cap Contract, amounts collected in respect of P&I Arrearages and
the obligation of the holders of the Class C Certificates to pay amounts in
respect of Excess Interest to the holders of the Class A, Class R, Class M and
Class B Certificates shall be treated as a "grantor trust" under the Code, for
the benefit of the holders of the Class C Certificates, and the provisions
hereof shall be interpreted consistently with this intention. In furtherance of
such intention, the Trustee shall (i) furnish or cause to be furnished to the
holders of the Class C Certificates information regarding their allocable share,
if any, of the income with respect to such grantor trust, (ii) file or cause to
be filed with the Internal Revenue Service Form 1041 (together with any
necessary attachments) and such other forms as may be applicable and (iii)
comply with such information reporting obligations with respect to payments from
such grantor trust to the holders of Class A, Class R, Class M, Class B and
Class C Certificates as may be applicable under the Code. Amounts collected in
respect of P&I Arrearages shall be an "outside reserve fund" for federal income
tax purposes and not an asset of any REMIC. Furthermore, the Holders of the
Class C Certificates shall be the beneficial owners of amounts collected in
respect of P&I Arrearages for all federal income tax purposes.

          (f) The parties intend that the portion of the Trust Fund consisting
of the right to receive amounts distributable to the Class P Certificates
pursuant to Section 4.04(b)(i) hereof shall be treated as a "grantor trust"
under the Code, for the benefit of the holders of the Class P Certificates, and
the provisions hereof shall be interpreted consistently with this intention. In
furtherance of such intention, the Trustee shall (i) furnish or cause to be
furnished to the holders of the Class P Certificates information regarding their
allocable share of the income with respect to such grantor trust and (ii) file
or cause to be filed with the Internal Revenue Service Form 1041 (together with
any necessary attachments) and such other forms as may be applicable.

          (g) The parties intend that amounts paid to the Swap Counterparty
under the Swap Agreement shall be deemed for federal income tax purposes to be
paid by the Class C Certificates first, out of funds deemed received in respect
of the Class UT-IO Interest, second, out of funds deemed received in respect of
the Uncertificated Class C Interest and third, out of funds deemed received in


                                      -56-

<PAGE>

respect of notional principal contracts described in Section 2.07(d)(ii), and
the provisions hereof shall be interpreted consistently with this intention. On
each Distribution Date, to the extent that amounts paid to the Swap Counterparty
are deemed paid out of funds received in respect of the Uncertificated Class C
Interest, such amounts will be treated as distributed by the Upper Tier REMIC to
the Class C Certificates pro rata in payment of the amounts specified in Section
4.04(g) and then paid to the Swap Counterparty pursuant to the Swap Agreement.

     The Supplemental Interest Trust shall be an "outside reserve fund" for
federal income tax purposes and not an asset of any REMIC. Furthermore, the
Holders of the Class C Certificates shall be the beneficial owners of the
Supplemental Interest Trust for all federal income tax purposes, and shall be
taxable on all income earned thereon.

          (h) [reserved].

          (i) All payments of principal and interest at the Net Mortgage Rate on
each of the Mortgage Loans (other than amounts distributable to the Class P
Certificates pursuant to Section 4.04(b)(i) hereof and other than amounts
collected in respect of Collectable Arrearages and P&I Arrearages) received by
the SWAP REMIC with respect to the Mortgage Loans shall be paid to the SWAP
REMIC Regular Interests until the principal balance of all such interests have
been reduced to zero and any losses allocated to such interests have been
reimbursed. Any available funds remaining in the SWAP REMIC on a Distribution
Date after distributions to the SWAP REMIC Regular Interests shall be
distributed to the Class R Certificates on account of the Class SWR Interest. On
each Distribution Date, the Trustee shall distribute the aggregate Interest
Funds (net of expenses and payments to the Class P Certificates) with respect to
each of the SWAP REMIC Regular Interests based on the interest rates for each
such SWAP REMIC Regular Interest. On each Distribution Date, the Trustee shall
distribute the aggregate Principal Funds first to the Class SW-Z Interest until
its principal balance is reduced to zero and then sequentially to each of the
other SWAP REMIC Regular Interests in ascending order of their numerical class
designation, in equal amounts to each such class in such numerical designation,
until the principal balance of each such class is reduced to zero. All losses
shall be allocated among the SWAP REMIC Regular Interests in the same manner
that principal distributions are allocated. Subsequent Recoveries and loss
reimbursements shall be allocated among the SWAP REMIC Regular Interests in the
reverse fashion from the manner in which losses are allocated.

     All payments received by the Lower Tier REMIC with respect to the SWAP
REMIC Regular Interests shall be paid to the Lower Tier REMIC Regular Interests
until the principal balance of all such interests have been reduced to zero and
any losses allocated to such interests have been reimbursed. Any excess amounts
shall be distributed to the Class LTR Interest. On each Distribution Date, an
amount equal to 50% of the increase in the Overcollateralization Amount shall be
payable as a reduction of the principal amounts of the Lower Tier REMIC Marker
Interests (with such amount allocated among the Lower Tier REMIC Marker
Interests so that each Lower Tier REMIC Marker Interest will have its principal
reduced by an amount equal to 50% of any increase in the Overcollateralization
Amount that results in a reduction in the principal balance of its Corresponding
Certificates) and will be accrued and added to the principal balance of the
Class LTX Interest. All payments of scheduled principal and prepayments of
principal on the Mortgage Loans shall be allocated 50% to the Class LTX Interest
and 50% to the Lower Tier REMIC Marker Interests (with principal payments
allocated to each of the Lower Tier REMIC Marker Interests in an amount equal to
50% of the principal amounts distributed to the Corresponding Certificates in
reduction of their principal amounts). Notwithstanding the preceding sentence,
an amount equal to the principal payments that result in a reduction in the
Overcollateralization


                                      -57-

<PAGE>

Amount shall be treated as payable entirely to the Class LTX Interest. Realized
Losses that are allocated to the Certificates shall be applied to the Lower Tier
REMIC Marker Interests and the Class LTX Interest so that after all
distributions have been made on each Distribution Date (i) the principal balance
of each of the Lower Tier REMIC Marker Interests is equal to 50% of the
principal balance of the Corresponding Certificates and (ii) the principal
balance of the Class LTX Interest is equal to the sum of (x) 50% of the
aggregate Stated Principal Balance of the Mortgage Loans and (y) 50% of the
Overcollateralization Amount. Each Lower Tier REMIC Marker Interest shall be
entitled to receive an amount equal to 50% of all amounts distributed to the
Corresponding Certificates in respect of unreimbursed amounts of Realized
Losses. The Class LTX Interest shall be entitled to receive all other amounts
distributed to the Certificates in respect of unreimbursed amounts of Realized
Losses.

     If on any Distribution Date the Certificate Principal Balance of any Class
of Certificates is increased pursuant to the last sentence of the definition of
"Certificate Principal Balance", then there shall be an equivalent increase in
the principal amounts of the Lower Tier REMIC Regular Interests, with such
increase allocated (before the making of distributions and the allocation of
losses on the Lower Tier REMIC Regular Interests on such Distribution Date)
among the Lower Tier REMIC Regular Interests so that (i) each of the Lower Tier
Marker Interests has a principal balance equal to 50% of the principal balance
of the Corresponding Certificates, (ii) the Class LTX Interest has a principal
balance equal to the sum of (x) 50% of the aggregate Stated Principal Balance of
the Mortgage Loans and (y) 50% of the Overcollateralization Amount.

          (j) In the event that any REMIC provided for herein fails to qualify
as a REMIC, loses its status as a REMIC or incurs federal, state or local taxes
as a result of a prohibited transaction or prohibited contribution under the
REMIC Provisions due to the negligent performance by the Servicer of its duties
and obligations set forth herein, the Servicer shall indemnify the Trustee and
the Issuing Entity against any and all Losses resulting from such negligence;
provided, however, that the Servicer shall not be liable for any such Losses
attributable to the action or inaction of the Trustee, the Depositor or the
Holder of the residual interest in such REMIC, as applicable, nor for any such
Losses resulting from misinformation provided by the Holder of the residual
interest in such REMIC on which the Servicer has relied. The foregoing shall not
be deemed to limit or restrict the rights and remedies of the Holder of the
residual interest in such REMIC now or hereafter existing at law or in equity.
Notwithstanding the foregoing, however, in no event shall the Servicer have any
liability (1) for any action or omission that is taken in accordance with and in
compliance with the express terms of, or which is expressly permitted by the
terms of, this Agreement, (2) for any Losses other than those arising out of a
negligent performance by the Servicer of its duties and obligations set forth
herein, and (3) for any special or consequential damages to Certificateholders
(in addition to payment of principal and interest on the Certificates).

          (k) In the event that any REMIC provided for herein fails to qualify
as a REMIC, loses its status as a REMIC, or incurs federal, state or local taxes
as a result of a prohibited transaction or prohibited contribution under the
REMIC Provisions due to the negligent performance by the Trustee of its duties
and obligations set forth herein, the Trustee shall indemnify the Issuing Entity
against any and all Losses resulting from such negligence; provided, however,
that the Trustee shall not be liable for any such Losses attributable to the
action or inaction of the Servicer, the Depositor or the Holder of the residual
interest in such REMIC, as applicable, nor for any such Losses resulting from
misinformation provided by the Holder of the residual interest in such REMIC on
which the Trustee has relied. The foregoing shall not be deemed to limit or
restrict the rights and remedies of the Holder of the residual interest in such
REMIC now or hereafter existing at law or in equity. Notwithstanding the
foregoing, however, in no event shall the Trustee have any liability (1) for any
action or omission that is taken in


                                      -58-

<PAGE>

accordance with and in compliance with the express terms of, or which is
expressly permitted by the terms of, this Agreement, (2) for any Losses other
than those arising out of a negligent performance by the Trustee of its duties
and obligations set forth herein, and (3) for any special or consequential
damages to Certificateholders (in addition to payment of principal and interest
on the Certificates).

          SECTION 2.08. [RESERVED]

          SECTION 2.09. Covenants of the Servicer. The Servicer hereby covenants
     to each of the other parties to this Agreement that the Servicer shall
     comply in the performance of its obligations under this Agreement with all
     reasonable rules and requirements of the insurer under each Required
     Insurance Policy.

          SECTION 2.10. [RESERVED]

          SECTION 2.11. Permitted Activities of the Trust. The Issuing Entity is
     created for the object and purpose of engaging in the Permitted Activities.
     In furtherance of the foregoing, the Trustee is hereby authorized and
     directed to execute and deliver on behalf of the Supplemental Interest
     Trust, and to perform the duties and obligations of the Supplemental
     Interest Trust under, the Cap Contract and any other agreement or
     instrument related thereto, in each case in such form as the Depositor
     shall direct or shall approve, the execution and delivery of any such
     agreement by the Depositor to be conclusive evidence of its approval
     thereof.

          SECTION 2.12. Qualifying Special Purpose Entity. For purposes of SFAS
     140, the parties hereto intend that the Issuing Entity shall be treated as
     a "qualifying special purpose entity" as such term is used in SFAS 140 and
     any successor rule thereto and its power and authority as stated in Section
     2.11 of this Agreement shall be limited in accordance with paragraph 35 or
      SFAS 140.

          SECTION 2.13. Depositor Notification of NIM Notes. The Depositor shall
     notify the Servicer in writing when NIM Notes are issued and when all
     previously issued NIM Notes are no longer outstanding.

                                   ARTICLE III

                          ADMINISTRATION AND SERVICING
                                OF MORTGAGE LOANS

          SECTION 3.01. Servicer to Service Mortgage Loans.

     For and on behalf of the Certificateholders, the Servicer shall service and
administer the Mortgage Loans in accordance with the Accepted Servicing
Practices. In connection with such servicing and administration, the Servicer
shall have full power and authority, acting alone and/or through subservicers as
provided in Section 3.02 hereof, to do or cause to be done any and all things
that it may deem necessary or desirable in connection with such servicing and
administration, including but not limited to, the power and authority, subject
to the terms hereof (i) to execute and deliver, on behalf of the
Certificateholders and the Trustee, customary consents or waivers and other
instruments and documents, (ii) to consent to transfers of any Mortgaged
Property and assumptions of the Mortgage Notes and related Mortgages (but only
in the manner provided in this Agreement), (iii) to collect any Insurance
Proceeds


                                      -59-

<PAGE>

and other Liquidation Proceeds and (iv) subject to Section 3.12(a), to
effectuate foreclosure or other conversion of the ownership of the Mortgaged
Property securing any Mortgage Loan; provided that, subject to Section 6.03, the
Servicer shall not take any action that is inconsistent with or prejudices the
interests of the Trust Fund or the Certificateholders in any Mortgage Loan
serviced by it under this Agreement or the rights and interests of the other
parties to this Agreement except as otherwise required by this Agreement or by
law. Notwithstanding anything in this Agreement to the contrary, the Servicer
shall not make or permit any modification, waiver or amendment of any term of
any Mortgage Loan which would cause any of the REMICs provided for herein to
fail to qualify as a REMIC or result in the imposition of any tax under Section
860G(a) or 860G(d) of the Code. The Servicer shall represent and protect the
interest of the Trust Fund in the same manner as it currently protects its own
interest in mortgage loans in its own portfolio in any claim, proceeding or
litigation regarding a Mortgage Loan, but in any case not in any manner that is
a lesser standard than that provided in the first sentence of this Section 3.01.
Without limiting the generality of the foregoing, the Servicer, in its own name
or in the name of the Depositor and the Trustee, is hereby authorized and
empowered by the Depositor and the Trustee, when the Servicer believes it
appropriate in its reasonable judgment, to execute and deliver, on behalf of the
Trustee, the Depositor, the Certificateholders or any of them, any and all
instruments of satisfaction or cancellation, or of partial or full release or
discharge, subordinations and all other comparable instruments, with respect to
the Mortgage Loans, and with respect to the Mortgaged Properties held for the
benefit of the Certificateholders. The Servicer shall prepare and deliver to the
Depositor and/or the Trustee such documents requiring execution and delivery by
any or all of them as are necessary or appropriate to enable the Servicer to
service and administer the Mortgage Loans, to the extent that the Servicer is
not permitted to execute and deliver such documents pursuant to the preceding
sentence. Upon receipt of such documents, the Depositor and/or the Trustee shall
execute such documents and deliver them to the Servicer. For purposes of this
Section 3.01, the Trustee hereby grants to the Servicer a limited power of
attorney to execute and file any and all documents necessary to fulfill the
obligations of the Servicer under this Section 3.01.

     The Mortgage Loans identified in Exhibit B-2 shall be subject to the
foreclosure restrictions described in this paragraph. In the event that any
Mortgage Loan that is subject to foreclosure restriction goes into foreclosure,
the Servicer will not be permitted to acquire title to the Mortgaged Property
underlying such loan on behalf of the related REMIC if acquiring title to such
Mortgaged Property would cause the aggregate adjusted basis (for federal income
tax purposes) of all Mortgaged Properties that are currently owned by the
related REMIC which were acquired in respect of loans subject to foreclosure
restriction (along with any other assets owned by that REMIC other than
"qualified mortgages" and "permitted investments" within the meaning of Section
860G of the Internal Revenue Code) to exceed 0.75% of the aggregate adjusted
basis of all of the assets in the related REMIC. Instead, the Servicer will be
required to dispose of such Mortgage Loan for cash in the foreclosure sale. In
addition, if the Servicer determines that, following the distributions on any
Distribution Date, the aggregate adjusted basis of Mortgaged Properties acquired
in respect of loans subject to foreclosure restriction (along with any other
assets owned by the related REMIC other than "qualified mortgages" and
"permitted investments" within the meaning of Section 860G of the Internal
Revenue Code) would exceed 1.0% of the aggregate adjusted basis of all of the
assets of the related REMIC immediately after giving effect to such
distributions, then, prior to such Distribution Date, the Servicer will be
required to dispose of a sufficient amount of such Mortgaged Properties for cash
such that the aggregate adjusted basis of such Mortgaged Properties (along with
any other assets owned by the related REMIC other than "qualified mortgages" and
"permitted investments" within the meaning of Section 860G of the Internal
Revenue Code) will be less than 1.0% of the aggregate adjusted basis of all of
the assets of the related REMIC. In either event, the Servicer will be permitted
to acquire (for its own account and not on behalf of the Trust) any Mortgaged
Property in


                                      -60-

<PAGE>

foreclosure at the foreclosure sale for an amount not less than the greater of:
(i) the highest amount bid by any other person at the foreclosure sale, or (ii)
the estimated fair value of the Mortgaged Property, as determined by the
Servicer in good faith. These foreclosure restrictions will be lifted with
respect to a Mortgage Loan if the Mortgage Loan becomes current for three
consecutive regular scheduled monthly payments.

     Upon request of the Servicer, the Trustee shall furnish the Servicer with
any powers of attorney and other documents in form as provided to it necessary
or appropriate to enable the Servicer to service and administer the Mortgage
Loans. The Trustee shall not be responsible for and the Servicer shall indemnify
the Trustee for any action taken by the Servicer pursuant to the application of
any power of attorney. Notwithstanding anything contained herein to the
contrary, the Servicer shall not without the Trustee's written consent, hire or
procure counsel to represent the Trustee without indicating its representative
capacity.

     The Servicer shall not be required to make any Servicing Advance with
respect to a Mortgage Loan that is 150 days or more delinquent.

     The Servicer and the Trustee shall have at least 10 days' notice of the
issuance of any NIM Notes.

     The Servicer shall deliver a list of Servicing Officers to the Trustee by
the Closing Date.

     The Servicer will transmit full-file credit reporting data for each
Mortgage Loan pursuant to Fannie Mae Guide Announcement 97-02 and for each
Mortgage Loan, the Servicer agrees that it shall report one of the following
statuses each month as follows: current, delinquent (30-, 60-, 90-days, etc.),
foreclosed or charged-off.

     The Servicer further is authorized and empowered by the Trustee, on behalf
of the Certificateholders and the Trustee, in its own name or in the name of the
Sub-Servicer, when the Servicer or the Sub-Servicer, as the case may be,
believes it is appropriate in its best judgment to register any Mortgage Loan on
the MERS System, or cause the removal from the registration of any Mortgage Loan
on the MERS System, to execute and deliver, on behalf of the Trustee and the
Certificateholders or any of them, any and all instruments of assignment and
other comparable instruments with respect to such assignment or re-recording of
a Mortgage in the name of MERS, solely as nominee for the Trustee and its
successors and assigns. Any reasonable expenses incurred in connection with the
actions described in the preceding sentence or as a result of MERS discontinuing
or becoming unable to continue operations in connection with the MERS System,
shall be subject to withdrawal by the Servicer from the Collection Account
(provided that such expenses constitute "unanticipated expenses" within the
meaning of Treasury Regulation Section 1.860G-1(b)(3)(ii)).

     With respect to any Mortgage Loan, the Servicer may consent to the
refinancing of the prior senior lien relating to such Mortgage Loan, provided
that the following requirements are met:

          (a) the resulting Combined Loan-to-Value Ratio of such Mortgage Loan
is no higher than the Combined Loan-to-Value Ratio prior to such refinancing;

          (b) the interest rate for the loan evidencing the refinanced senior
lien is no more than 2.0% higher than the interest rate on the loan evidencing
the existing senior lien immediately prior to the date of such refinancing; and


                                      -61-

<PAGE>

          (c) the loan evidencing the refinanced senior lien is not subject to
negative amortization.

          SECTION 3.02. Servicing and Subservicing; Enforcement of the
     Obligations of Servicer.

          (a) The Servicer may arrange for the subservicing of any Mortgage Loan
by a subservicer, which may be an affiliate, pursuant to a subservicing
agreement (each, a "Subservicing Agreement"); provided, however, that (i) such
subservicing arrangement and the terms of the related Subservicing Agreement
must provide for the servicing of such Mortgage Loans in a manner consistent
with the servicing arrangements contemplated hereunder and (ii) that such
agreement would not result in a withdrawal or downgrading by any Rating Agency
of the ratings of any Certificates or any of the NIM Notes evidenced by a letter
to that effect delivered by each Rating Agency to the Depositor. Notwithstanding
the provisions of any Subservicing Agreement, any of the provisions of this
Agreement relating to agreements or arrangements between the Servicer and a
subservicer or reference to actions taken through a subservicer or otherwise,
the Servicer shall remain obligated and liable to the Depositor, the Trustee and
the Certificateholders for the servicing and administration of the Mortgage
Loans in accordance with the provisions of this Agreement without diminution of
such obligation or liability by virtue of such Subservicing Agreements or
arrangements or by virtue of indemnification from the subservicer and to the
same extent and under the same terms and conditions as if the Servicer alone
were servicing and administering the Mortgage Loans. Every Subservicing
Agreement entered into by the Servicer shall contain a provision giving any
successor servicer the option to terminate such agreement in the event a
successor servicer is appointed. All actions of the each subservicer performed
pursuant to the related Subservicing Agreement shall be performed as an agent of
the Servicer with the same force and effect as if performed directly by the
Servicer. The Servicer shall deliver to the Trustee copies of all Subservicing
Agreements. The Trustee shall have no obligations, duties or liabilities with
respect to a subservicer, including, without limitation, any obligation, duty or
liability to monitor such subservicer or to pay a Subservicer's fees and
expenses.

          (b) For purposes of this Agreement, the Servicer shall be deemed to
have received any collections, recoveries or payments with respect to the
related Mortgage Loans that are received by a subservicer regardless of whether
such payments are remitted by the subservicer to the Servicer.

          (c) The Servicer shall not permit a Subservicer to perform any
servicing responsibilities hereunder with respect to the Mortgage Loans unless
that Subservicer first agrees in writing with the Servicer to deliver an
Assessment of Compliance and an Accountant's Attestation in such manner and at
such times that permits that Servicer to comply with Section 3.17 of this
Agreement.

          SECTION 3.03. Rights of the Depositor and the Trustee in Respect of
     the Servicer.

     Neither the Trustee nor the Depositor shall have any responsibility or
liability for any action or failure to act by the Servicer, and neither of them
is obligated to supervise the performance of the Servicer hereunder or
otherwise.

          SECTION 3.04. Trustee to Act as Servicer.

     Subject to Sections 6.04 and 7.02, in the event that the Servicer shall for
any reason no longer be the servicer hereunder (including by reason of an Event
of Default), the Trustee or its designee shall, within a period of time not to
exceed ninety (90) days from the date of notice of termination or


                                      -62-

<PAGE>

resignation, thereupon assume all of the rights and obligations of the Servicer
hereunder arising thereafter (except that the Trustee shall not be (i) liable
for losses arising out of any acts or omissions of the predecessor servicer
hereunder, (ii) obligated to make Advances or Servicing Advances if it is
prohibited from doing so by applicable law, (iii) obligated to effectuate
repurchases or substitutions of Mortgage Loans hereunder, including pursuant to
Section 2.02 or 2.03 hereof, (iv) responsible for any expenses of the Servicer
pursuant to Section 2.03 or (v) deemed to have made any representations and
warranties hereunder, including pursuant to Section 2.04 or the first paragraph
of Section 6.02 hereof; provided, however that the Trustee (subject to clause
(ii) above) or its designee, in its capacity as the successor servicer, shall
immediately assume the terminated or resigning Servicer's obligation to make
Advances and Servicing Advances). No such termination or resignation shall
affect any obligation of the Servicer to pay amounts owed under this Agreement
and to perform its duties under this Agreement until its successor assumes all
of its rights and obligations hereunder. If the Servicer shall for any reason no
longer be a servicer (including by reason of any Event of Default), the Trustee
(or any other successor servicer) may, at its option, succeed to any rights and
obligations of the Servicer under any subservicing agreement in accordance with
the terms thereof; provided, however, that the Trustee (or any other successor
servicer) shall not incur any liability or have any obligations in its capacity
as servicer under a subservicing agreement arising prior to the date of such
succession unless it expressly elects to succeed to the rights and obligations
of the Servicer thereunder; and the Servicer shall not thereby be relieved of
any liability or obligations under the subservicing agreement arising prior to
the date of such succession. To the extent any costs or expenses, including
without limitation, Servicing Transfer Costs incurred by the Trustee in
connection with this Section 3.04 or Section 7.02, are not paid by the Servicer
pursuant to this Agreement within 30 days of the date of the Trustee's invoice
thereof, such amounts shall be payable out of the Certificate Account; provided
that if the Servicer has been terminated by reason of an Event of Default, the
terminated servicer shall reimburse the Issuing Entity for any such expense
incurred by the Issuing Entity upon receipt of a reasonably detailed invoice
evidencing such expenses. If the Trustee is unwilling or unable to act as
servicer, the Trustee shall seek to appoint a successor servicer that is
eligible in accordance with the criteria specified in this Agreement.

     The Servicer shall, upon request of the Trustee, but at the expense of the
Servicer if the Servicer has been terminated by reason of an Event of Default,
deliver to the assuming party all documents and records relating to each
subservicing agreement and the Mortgage Loans then being serviced and otherwise
use its best efforts to effect the orderly and efficient transfer of the
subservicing agreement to the assuming party.

          SECTION 3.05. Collection of Mortgage Loan Payments; Collection
     Account; Certificate Account.

          (a) The Servicer shall make reasonable efforts in accordance with
Accepted Servicing Practices to collect all payments called for under the terms
and provisions of the Mortgage Loans to the extent such procedures shall be
consistent with this Agreement and the terms and provisions of any related
Required Insurance Policy. Consistent with the foregoing, the Servicer may in
its discretion (i) waive any late payment charge or, if applicable, any default
interest charge, or (ii) subject to Section 3.01, extend the due dates for
payments due on a Mortgage Note for a period not greater than 180 days;
provided, however, that any extension pursuant to clause (ii) above shall not
affect the amortization schedule of any Mortgage Loan for purposes of any
computation hereunder, except as provided below. In the event of any such
arrangement pursuant to clause (ii) above, subject to Section 4.01, the Servicer
shall make any Advances on the related Mortgage Loan during the scheduled period
in accordance with the amortization schedule of such Mortgage Loan without
modification thereof by reason of such


                                      -63-

<PAGE>

arrangements. Notwithstanding the foregoing, in the event that any Mortgage Loan
is in default or, in the judgment of the Servicer, such default is reasonably
foreseeable, the Servicer, consistent with the standards set forth in Section
3.01, may also (x) waive, modify or vary any term of such Mortgage Loan
(including modifications that would change the Mortgage Rate, forgive the
payment of principal or interest or extend the final maturity date of such
Mortgage Loan); provided, however, that the Servicer shall not modify more than
5% of the of the Stated Principal Balances of the Mortgage Loans, (y) accept
payment from the related Mortgagor of an amount less than the Stated Principal
Balance in final satisfaction of such Mortgage Loan, or (z) consent to the
postponement of strict compliance with any such term or otherwise grant
indulgence to any Mortgagor (any and all such waivers, modifications, variances,
forgiveness of principal or interest, postponements, or indulgences collectively
referred to herein as "forbearance"), provided, however, that in determining
which course of action permitted by this sentence it shall pursue, the Servicer
shall adhere to the standards of Section 3.01. The Servicer's analysis
supporting any forbearance and the conclusion that any forbearance meets the
standards of Section 3.01 shall be reflected in writing in the Mortgage File.

          (b) The Servicer will not waive any Prepayment Charge or portion
thereof unless, (i) the enforceability thereof shall have been limited by
bankruptcy, insolvency, moratorium, receivership or other similar laws relating
to creditors' rights generally or is otherwise prohibited by law, or (ii) the
collectability thereof shall have been limited due to acceleration in connection
with a foreclosure or other involuntary payment, or (iii) the Servicer has not
been provided with information sufficient to enable it to collect the Prepayment
Charge, or (iv) in the Servicer's reasonable judgment as described in Section
3.01 hereof, (x) such waiver relates to a default or a reasonably foreseeable
default, (y) such waiver would maximize recovery of total proceeds taking into
account the value of such Prepayment Charge and related Mortgage Loan and (z)
doing so is standard and customary in servicing similar Mortgage Loans
(including any waiver of a Prepayment Charge in connection with a refinancing of
a Mortgage Loan that is related to a default or a reasonably foreseeable
default), or (v) the collection of the Prepayment Charge or of a similar type of
prepayment premium would be considered "predatory" or "illegal" pursuant to
written guidance published by any applicable federal, state or local regulatory
authority having jurisdiction over such matters or has been challenged by any
such authority, or (vi) only to the extent that the Depositor has notified the
Servicer that there are no NIM Notes outstanding, there is a certified class
action in which a similar type of prepayment premium is being challenged. Except
as provided in the preceding sentence, in no event will the Servicer waive a
Prepayment Charge in connection with a refinancing of a Mortgage Loan that is
not related to a default or a reasonably foreseeable default. If the Servicer
waives or does not collect all or a portion of a Prepayment Cha


 
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