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POOLING AND SERVICING AGREEMENT

Pooling and Servicing Agreement

POOLING AND SERVICING AGREEMENT | Document Parties: DEUTSCHE BANK NATIONAL TRUST COMPANY | IndyMac Bank | INDYMAC MBS, INC You are currently viewing:
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DEUTSCHE BANK NATIONAL TRUST COMPANY | IndyMac Bank | INDYMAC MBS, INC

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Title: POOLING AND SERVICING AGREEMENT
Governing Law: Delaware     Date: 3/14/2007

POOLING AND SERVICING AGREEMENT, Parties: deutsche bank national trust company , indymac bank , indymac mbs  inc
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                                  EXHIBIT 99.1
                                  ____________

                       The Pooling and Servicing Agreement



<PAGE>
================================================================================


                                 INDYMAC MBS, INC.
                                    Depositor


                              INDYMAC BANK, F.S.B.
                               Seller and Servicer


                      DEUTSCHE BANK NATIONAL TRUST COMPANY
                                      Trustee


                   ________________________________________

                         POOLING AND SERVICING AGREEMENT
                          Dated as of February 1, 2007

                   ________________________________________


                    RESIDENTIAL ASSET SECURITIZATION TRUST
                                 Series 2007-A3


                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  Series 2007-C


================================================================================

<PAGE>


<TABLE>
<CAPTION>
                                                          TABLE OF CONTENTS

                                                                                                                                Page
                                                                                                                               ----
<S>                              <C>                                                                                              <C>
ARTICLE ONE DEFINITIONS...........................................................................................................9

           Section 1.01         Definitions........................................................................................9
           Section 1.02         Rules of Construction.............................................................................40

ARTICLE TWO CONVEYANCE OF MORTGAGE LOANS; REPRESENTATIONS AND WARRANTIES.........................................................42

           Section 2.01         Conveyance of Mortgage Loans......................................................................42
           Section 2.02         Acceptance by the Trustee of the Mortgage Loans...................................................45
           Section 2.03         Representations, Warranties, and Covenants of the Seller and the Servicer.........................47
           Section 2.04         Representations and Warranties of the Depositor as to the Mortgage Loans..........................49
           Section 2.05         Delivery of Opinion of Counsel in Connection with Substitutions...................................49
           Section 2.06         Execution and Delivery of Certificates............................................................49
           Section 2.07         REMIC Matters.....................................................................................50

ARTICLE THREE ADMINISTRATION AND SERVICING OF MORTGAGE LOANS.....................................................................51

           Section 3.01         Servicer to Service Mortgage Loans................................................................51
           Section 3.02         [Reserved]........................................................................................52
           Section 3.03         Rights of the Depositor and the Trustee in Respect of the Servicer................................52
            Section 3.04         [Reserved]........................................................................................52
           Section 3.05         Trustee to Act as Servicer........................................................................52
            Section 3.06         Collection of Mortgage Loan Payments; Certificate Account; Distribution Account...................52
           Section 3.07         Collection of Taxes, Assessments and Similar Items; Escrow Accounts...............................55
           Section 3.08         Access to Certain Documentation and Information Regarding the Mortgage Loans......................56
           Section 3.09         Permitted Withdrawals from the Certificate Account and the Distribution Account...................56
           Section 3.10         Maintenance of Hazard Insurance; Maintenance of Primary Insurance Policies........................57
           Section 3.11         Enforcement of Due-On-Sale Clauses; Assumption Agreements.........................................58
           Section 3.12         Realization Upon Defaulted Mortgage Loans.........................................................59
           Section 3.13         Trustee to Cooperate; Release of Mortgage Files...................................................61
           Section 3.14         Documents, Records and Funds in Possession of the Servicer to be Held for the Trustee.............62
           Section 3.15         Servicing Compensation............................................................................62
           Section 3.16         Access to Certain Documentation...................................................................63
           Section 3.17         Annual Statement as to Compliance.................................................................63
           Section 3.18         Errors and Omissions Insurance; Fidelity Bonds....................................................63
           Section 3.19         [Reserved]........................................................................................64
           Section 3.20         Prepayment Charges................................................................................64

ARTICLE FOUR DISTRIBUTIONS AND ADVANCES BY THE SERVICER..........................................................................65

                                                                  i

<PAGE>

           Section 4.01         Advances..........................................................................................65
           Section 4.02         Priorities of Distribution........................................................................66
           Section 4.03         Cross-Collateralization; Adjustments to Available Funds...........................................70
           Section 4.04         [Reserved]........................................................................................71
           Section 4.05         Allocation of Realized Losses.....................................................................71
           Section 4.06         Monthly Statements to Certificateholders..........................................................72
           Section 4.07         [Reserved]........................................................................................75
           Section 4.08         [Reserved]........................................................................................75
           Section 4.09         Determination of Pass-Through Rates for LIBOR Certificates........................................75

ARTICLE FIVE THE CERTIFICATES....................................................................................................77

           Section 5.01         The Certificates..................................................................................77
           Section 5.02         Certificate Register; Registration of Transfer and Exchange of Certificates.......................77
           Section 5.03         Mutilated, Destroyed, Lost or Stolen Certificates.................................................81
           Section 5.04         Persons Deemed Owners.............................................................................81
           Section 5.05         Access to List of Certificateholders' Names and Addresses.........................................81
           Section 5.06         Maintenance of Office or Agency...................................................................82

ARTICLE SIX THE DEPOSITOR AND THE SERVICER.......................................................................................83

           Section 6.01         Respective Liabilities of the Depositor and the Servicer..........................................83
           Section 6.02         Merger or Consolidation of the Depositor or the Servicer..........................................83
           Section 6.03         Limitation on Liability of the Depositor, the Seller, the Servicer, and Others....................83
           Section 6.04         Limitation on Resignation of the Servicer.........................................................84

ARTICLE SEVEN DEFAULT ...........................................................................................................85

           Section 7.01         Events of Default.................................................................................85
           Section 7.02         Trustee to Act; Appointment of Successor..........................................................86
           Section 7.03         Notification to Certificateholders................................................................87

ARTICLE EIGHT CONCERNING THE TRUSTEE.............................................................................................89

            Section 8.01         Duties of the Trustee.............................................................................89
           Section 8.02         Certain Matters Affecting the Trustee.............................................................89
           Section 8.03         Trustee Not Liable for Certificates or Mortgage Loans.............................................91
           Section 8.04         Trustee May Own Certificates......................................................................91
           Section 8.05         Trustee's Fees and Expenses.......................................................................91
           Section 8.06         Eligibility Requirements for the Trustee..........................................................92
           Section 8.07         Resignation and Removal of the Trustee............................................................92
           Section 8.08         Successor Trustee.................................................................................93
           Section 8.09         Merger or Consolidation of the Trustee............................................................94
           Section 8.10         Appointment of Co-Trustee or Separate Trustee.....................................................94
           Section 8.11         Tax Matters.......................................................................................95

ARTICLE NINE TERMINATION.........................................................................................................98

           Section 9.01         Termination upon Liquidation or Purchase of the Mortgage Loans....................................98

                                                                 ii

<PAGE>

           Section 9.02         Final Distribution on the Certificates............................................................98
           Section 9.03         Additional Termination Requirements...............................................................99

ARTICLE TEN MISCELLANEOUS PROVISIONS............................................................................................101

           Section 10.01        Amendment........................................................................................101
           Section 10.02        Recordation of Agreement; Counterparts...........................................................102
           Section 10.03        Governing Law....................................................................................103
           Section 10.04        Intention of Parties.............................................................................103
           Section 10.05        Notices .........................................................................................103
           Section 10.06        Severability of Provisions.......................................................................104
           Section 10.07        Assignment.......................................................................................104
           Section 10.08        Limitation on Rights of Certificateholders.......................................................104
           Section 10.09        Inspection and Audit Rights......................................................................105
           Section 10.10        Certificates Nonassessable and Fully Paid........................................................105
           Section 10.11        Official Record..................................................................................105
           Section 10.12        Protection of Assets.............................................................................106
           Section 10.13        Qualifying Special Purpose Entity................................................................106

ARTICLE ELEVEN EXCHANGE ACT REPORTING...........................................................................................107

           Section 11.01        Filing Obligations...............................................................................107
           Section 11.02        Form 10-D Filings................................................................................107
           Section 11.03        Form 8-K Filings.................................................................................108
           Section 11.04        Form 10-K Filings................................................................................108
           Section 11.05        Sarbanes-Oxley Certification.....................................................................111
           Section 11.06        Form 15 Filing...................................................................................111
           Section 11.07        Report on Assessment of Compliance and Attestation...............................................111
           Section 11.08        Use of Subcontractors............................................................................112
           Section 11.09        Amendments.......................................................................................113

                                                                iii

<PAGE>


                                                              SCHEDULES

Schedule I:               Mortgage Loan Schedule...............................................................................S-I-1

Schedule II:              Representations and Warranties of the Seller/Servicer...............................................S-II-1

Schedule III:             Representations and Warranties as to the Mortgage Loans............................................S-III-1

Schedule IV:              [Reserved]..........................................................................................S-IV-1

Schedule V:               Form of Monthly Report...............................................................................S-V-1


                                                              EXHIBITS

Exhibit A:                Form of Senior Certificate (other than the Notional Amount Certificates)...............................A-1

Exhibit B:                Form of Subordinated Certificate.......................................................................B-1

Exhibit C:                 Form of Class A-R Certificate..........................................................................C-1

Exhibit D:                Form of Notional Amount Certificate....................................................................D-1

Exhibit E:                Form of Reverse of Certificates........................................................................E-1

Exhibit F:                [Reserved].............................................................................................F-1

Exhibit G-1:              Form of Initial Certification of Trustee ............................................................G-1-1

Exhibit G-2:              Form of Delay Delivery Certification.................................................................G-2-1

Exhibit H:                Form of Final Certification of Trustee.................................................................H-1

Exhibit I:                Form of Transfer Affidavit.............................................................................I-1

Exhibit J:                Form of Transferor Certificate.........................................................................J-1

Exhibit K:                Form of Investment Letter (Non-Rule 144A)..............................................................K-1

Exhibit L:                Form of Rule 144A Letter...............................................................................L-1

Exhibit M:                Form of Request for Release (for Trustee)..............................................................M-1

Exhibit N:                Request for Release of Documents.......................................................................N-1

Exhibit O-1:              Form of Certification to be Provided by the Depositor with Form 10-K.................................O-1-1

Exhibit O-2:              Form of Trustee's Officer's Certificate..............................................................O-2-1

Exhibit P:                [Reserved].............................................................................................P-1

                                                                 iv

<PAGE>

Exhibit Q:                Reporting Responsibility...............................................................................Q-1

Exhibit R:                Form of Performance Certification (Trustee)............................................................R-1

Exhibit S:                Form of Servicing Criteria to be Addressed in Assessment of Compliance Statement.......................S-1

Exhibit T:                List of 1119 Parties...................................................................................T-1

Exhibit U:                Form of Sarbanes-Oxley Certification (Replacement of Servicer).........................................U-1

                                                                 v
</TABLE>

<PAGE>

      THIS POOLING AND SERVICING AGREEMENT, dated as of February 1, 2007, among
INDYMAC MBS, INC., a Delaware corporation, as depositor (the "Depositor"),
IndyMac Bank, F.S.B. ("IndyMac"), a federal savings bank, as seller (in that
capacity, the "Seller") and as servicer (in that capacity, the "Servicer"), and
Deutsche Bank National Trust Company, a national banking association, as trustee
(in that capacity, the "Trustee"),

                           W I T N E S S E T H T H A T

      In consideration of the mutual agreements set forth in this Agreement, the
parties agree as follows:

                   P R E L I M I N A R Y S T A T E M E N T

      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 four REMICs ("REMIC 1", "REMIC 2", "REMIC 3" and
the "Master REMIC"). Each Certificate, other than the Class A-R Certificate,
will represent ownership of one or more regular interests in the Master REMIC
for purposes of the REMIC Provisions. The Class A-R Certificate represents
ownership of the sole class of residual interest in each REMIC created
hereunder. The Master REMIC will hold as assets the REMIC 3 Regular Interests.
REMIC 3 will hold as assets the REMIC 2 Regular Interests. REMIC 2 will hold as
assets the REMIC 1 Regular Interests. REMIC 1 will hold as assets all property
of the Trust Fund. For federal income tax purposes, each Certificate (other than
the Class A-R Certificate) is hereby designated as a regular interest in the
Master REMIC and each REMIC 1 Regular Interest, REMIC 2 Regular Interest and
REMIC 3 Regular Interest, as defined below, is designated as a regular interest
in the REMIC 1, REMIC 2, and REMIC 3, respectively. The latest possible maturity
date of all REMIC regular interests created in this Agreement shall be the
Latest Possible Maturity Date. All amounts in respect of waived Prepayment
Charges paid by the Servicer to the Class 2-A-2 Certificates pursuant to Section
3.20(b) hereof will be treated as paid directly by the Servicer to the Class
2-A-2 Certificates and not as paid by or through any REMIC created hereunder.


                                     REMIC 1

      REMIC 1 will issue a single regular interest corresponding to each
Mortgage Loan having an Adjusted Net Mortgage Rate less than or equal to 5.75%,
two regular interests (referred to collectively herein as the "Class 1-A
Interests" and the "Class 1-B Interests") for each Mortgage Loan having an
Adjusted Net Mortgage Rate greater than 5.75% and less than 7.00%.

      Each REMIC 1 Regular Interest corresponding to a Mortgage Loan having an
Adjusted Net Mortgage Rate less than or equal to 5.75% and each Class 1-A
Interest will have a Pass Through Rate of 5.75% and a principal balance,
following the allocation of scheduled principal, prepayments of principal and
Realized Losses, equal to the product of: (i) the Applicable Fraction in respect
of Collateral Allocation Group 1 and (ii) the principal balance of the related
Mortgage Loan. For purposes of the calculating the Calculation Rate, each of the
foregoing REMIC 1 Regular Interests will be treated as part of Collateral
Allocation Group 1.

      Each of the Class 1-B Interests will have a Pass Through Rate of 7.00% and
a principal balance, following the allocation of scheduled principal,
prepayments of principal and Realized Losses, equal to the product of: (i) the
Applicable Fraction in respect of Collateral Allocation Group 2 and (ii) the

                                        1
<PAGE>

principal balance of the related Mortgage Loan. For purposes of the calculating
the Calculation Rate, each Class 1-B Interest will be treated as part of
Collateral Allocation Group 2.

            REMIC 1 also will issue the Class 1-PO, Class 1-$100 Interest and
Class R-1 Interest. The Class 1-PO Interests will have a principal balance,
following the allocation of scheduled principal, prepayments of principal and
Realized Losses, equal to the principal balance of the Class PO Certificates and
will not be entitled to receive distributions of interest. The Class 1-$100
Interest will have a principal balance and pass through rate equal to the Class
A-R Certificates. The Class R-1 Interest is the residual interest and will not
be entitled to any distributions of interest or principal.

                                     REMIC 2

      The REMIC 2 Regular Interests will have the initial principal balance,
Pass-Through Rates and corresponding Collateral Allocation Groups as set forth
in the following table:

<TABLE>
<CAPTION>
===========================================================   ====================   =================   ========================
                                                             Initial Principal                         Corresponding Collateral
REMIC 2 Interests                                             Balance                 Pass-Through Rate   Allocation Group
___________________________________________________________   ____________________   _________________   ________________________
<S>                                                           <C>                    <C>                  <C>
A-1   (0.9% of AB Collateral Allocation Group 1)                       (1)                 5.75%                    1
___________________________________________________________   ____________________   _________________   ________________________
B-1   (0.1% of AB Collateral Allocation Group 1)                       (1)                 5.75%                    1
___________________________________________________________   ____________________   _________________   ________________________
C-1   (Excess of Collateral Allocation Group 1)                        (1)                 5.75%                    1
___________________________________________________________   ____________________   _________________   ________________________
2-PO                                                                   (1)                 0.00%                   N/A
___________________________________________________________   ____________________   _________________   ________________________
A-2   (0.9% of AB Collateral Allocation Group 2)                       (1)                 7.00%                    2
___________________________________________________________   ____________________   _________________   ________________________
B-2   (0.1% of AB Collateral Allocation Group 2)                        (1)                 7.00%                    2
___________________________________________________________   ____________________   _________________   ________________________
C-2   (Excess of Collateral Allocation Group 2)                        (1)                  7.00%                    2
___________________________________________________________   ____________________   _________________   ________________________
2-$100                                                               $100                 5.75%                   N/A
___________________________________________________________   ____________________   _________________   ________________________
R-2                                                                   (2)                  (2)                     N/A
===========================================================   ====================   =================   ============++==========
</TABLE>

(1)    Each Class A Interest will have a principal balance initially equal to
      0.9% of the Assumed Balance ("AB") of its corresponding Collateral
      Allocation Group. Each Class B Interest will have a principal balance
      initially equal to 0.1% of the AB of its corresponding Collateral
      Allocation Group. The initial principal balance of each Class C Interest
      will equal the excess of the initial aggregate principal balance of its
      corresponding Collateral Allocation Group over the initial aggregate
      principal balances of the Class A and Class B Interests (and the 2-$100
      Interest in the case of the Class C-1 Interest) corresponding to such
      Collateral Allocation Group. On each Distribution Date following the
      allocation of scheduled principal, prepayments and Realized Losses, the
      Class 2-PO and 2-$100 Interests will have the principal balances of the
      Class PO and Class A-R Certificates, respectively.

(2)    The Class R-2 Interest is the sole class of residual interest in REMIC 2.
      It has no principal balance and pays no principal or interest.

      On each Distribution Date, interest and principal collections that are not
allocated to the Class 2-PO Interests shall be distributed with respect to the
REMIC 2 Interests in the following manner:

(1)    Interest is to be distributed with respect to each REMIC 2 Interest
      according to the formulas described above;

                                       2
<PAGE>

(2)    If a Cross-Over Situation does not exist with respect to any Class of
      Interests, then Principal Amounts and Realized Losses arising with respect
      to each Collateral Allocation Group will be allocated: first to cause the
      Collateral Allocation Group's corresponding Class A and Class B to equal,
      respectively, 0.9% of the AB and 0.1% of the AB; and second to the
      Collateral Allocation Group's corresponding Class C Interest;

(3)    If a Cross-Over Situation exists with respect to the Class A and B
      Interests then:

      (a)    if the Calculation Rate in respect of such Class A and Class B
            Interests is less than the Pass Through Rate in respect of the
            Subordinate Certificates, Principal Relocation Payments will be made
            proportionately to the outstanding Class A Interests prior to any
            other distributions of principal from each such Collateral
            Allocation Group; and

      (b)    if the Calculation Rate in respect of such outstanding Class A and
            Class B Interests is greater than the Pass Through Rate in respect
            of the Subordinate Certificates, Principal Relocation Payments will
            be made proportionately to the outstanding Class B Interests prior
            to any other distributions of principal from each such Collateral
            Allocation Group.

      In case of either (a) or (b), Principal Relocation Payments will be made
      so as to cause the Calculation Rate in respect of the outstanding Class A
      and B Interests to equal the Pass Through Rate in respect of the
      Subordinate Certificates. With respect to each Collateral Allocation
      Group, if (and to the extent that) the sum of (a) the principal payments
      comprising the Principal Amount received during the Due Period and (b) the
      Realized Losses on the Mortgage Loans in that Collateral Allocation Group,
      are insufficient to make the necessary reductions of principal on the
      Class A and B Interests, then interest will be added to the Collateral
      Allocation Group's other REMIC 1 Interests that are not receiving
      Principal Relocation Payments, in proportion to their principal balances.

      (c)    Unless required to achieve the Calculation Rate, the outstanding
            aggregate Class A and B Interests will not be reduced below 1% of
            the excess of (i) the aggregate Stated Principal Balance of the
            Mortgage Loans as of the end of any Due Period over (ii) the
            Certificate Balance Senior Certificates (excluding the Class A-R
            Certificates) as of the related Distribution Date (after taking
            into account distributions of principal on such Distribution
            Date).

      If (and to the extent that) the limitation in paragraph (c) prevents the
      distribution of principal to the Class A and Class B Interests of a
      Collateral Allocation Group, and if the Collateral Allocation Group's
      Class C Interest has already been reduced to zero, then the excess
      principal from that Collateral Allocation Group will be paid to the Class
      C Interests of the other Collateral Allocation Group, the aggregate Class
      A and Class B Interests of which are less than 1% of the AB. If the
      Mortgage Loans in the Collateral Allocation Group of the Class C Interest
      that receives such payment has a weighted average Adjusted Net Mortgage
      Rate below the weighted average Adjusted Net Mortgage Rate of the Mortgage
      Loans in the Collateral Allocation Group making the payment, then the
      payment will be treated by the REMIC 2 as a Realized Loss. Conversely, if
      the Mortgage Loans in the Collateral Allocation Group of the Class C
      Interest that receives such payment have a weighted average Adjusted Net
      Mortgage Rate above the weighted average Adjusted Net Mortgage Rate of the
      Mortgage Loans in the Collateral Allocation Group making the payment, then
      the payment will be treated by the REMIC 2 as a reimbursement for prior
      Realized Losses.

                                       3
<PAGE>

                                     REMIC 3

      The following table sets forth characteristics of the REMIC 3 Regular
Interests:

<TABLE>
<CAPTION>
================================================================================
                       Class
                     Principal     Pass-Through     Allocation of     Allocation
Class Designation      Balance          Rate           Interest       of Principal
--------------------------------------------------------------------------------
<S>                   <C>          <C>               <C>               <C>

  Class 3-1-A-1          (1)            5.75%        Class 1-A-1,      Class 1-A-1,
                                                      1-A-2            1-A-2
--------------------------------------------------------------------------------
  Class 3-1-A-3          (1)            5.75%         Class 1-A-3      Class 1-A-3
--------------------------------------------------------------------------------
  Class 3-1-A-4          (1)            5.75%         Class 1-A-4      Class 1-A-4
--------------------------------------------------------------------------------
  Class 3-2-A-1          (1)            7.00%        Class 2-A-1,      Class 2-A-1
                                                  Class 2-A-2
--------------------------------------------------------------------------------
    Class 3-PO           (1)            0.00%             N/A           Class PO
--------------------------------------------------------------------------------
   Class 3-$100          (1)            5.75%          Class A-R        Class A-R
--------------------------------------------------------------------------------
   Class 3-B-1           (1)          Weighted         Class B-1        Class B-1
                                 Average Rate -
                                   0.3937% (2)
--------------------------------------------------------------------------------
  Class 3-B-1IO          (1)           0.3937%        Class B-IO           N/A
--------------------------------------------------------------------------------
   Class 3-B-2           (1)          Weighted         Class B-2        Class B-2
                                 Average Rate -
                                   0.1437% (2)
--------------------------------------------------------------------------------
  Class 3-B-2IO          (1)           0.1437%        Class B-2IO          N/A
--------------------------------------------------------------------------------
   Class 3-B-3           (1)          Weighted         Class B-3        Class B-3
                                  Average Rate
                                       (2)
--------------------------------------------------------------------------------
   Class 3-B-4           (1)          Weighted         Class B-4        Class B-4
                                  Average Rate
                                       (2)
--------------------------------------------------------------------------------
   Class 3-B-5           (1)          Weighted         Class B-5        Class B-5
                                  Average Rate
                                        (2)
--------------------------------------------------------------------------------
   Class 3-B-6           (1)          Weighted         Class B-6        Class B-6
                                  Average Rate
                                        (2)
--------------------------------------------------------------------------------
   Class R-3(3)          N/A             N/A              N/A              N/A
================================================================================
</TABLE>

(1)    For each Distribution Date, following the allocation of scheduled
      principal, Principal Prepayments and Realized Losses, the principal
      balance for each such Class will be the principal balance in respect of
      the corresponding Class of Certificates (or the sum of the principal
      balances if there is more than one corresponding Class) set forth under
      the Column titled "Allocation of Principal".

(2)    The Weighted Average Rate for a Class of Subordinated Certificates for the
      Interest Accrual Period for any Distribution Date will be a per annum rate
      equal to the sum of (i) 5.75% multiplied by the excess of the sum of the
      related Applicable Fraction for Collateral Allocation Group 1 of the
       aggregate Stated Principal Balance of each Mortgage Loan included in
      Collateral Allocation Group 1 as of the Due Date in the month preceding
      the month of that Distribution Date (after giving effect to Principal
      Prepayments received in the Prepayment Period related to that prior Due
      Date) over the Class Certificate Balance of the Group 1 Senior
      Certificates immediately prior to that Distribution Date and (ii) 7.00%
      multiplied by the excess of the sum of the related Applicable Fraction for
      Collateral Allocation Group 2 of the aggregate Stated Principal Balance of
      each Mortgage Loan included in Collateral Allocation Group 2 as of the Due
      Date in the prior month (after giving effect to Principal Prepayments
      received in the Prepayment Period related to that prior Due Date) over the
      aggregate Class Certificate Balance of the Group 2 Senior Certificates
      immediately prior to that Distribution Date, divided by the aggregate
      Class Certificate

                                       4
<PAGE>

      Balance of the Subordinated Certificates immediately prior to that
      Distribution Date. The Pass-Through Rate for each class of Subordinated
      Certificates for the initial Interest Accrual Period is 6.3938% per annum.
      For federal income tax purposes, the Pass-Through Rate for each class of
      Subordinated Certificates shall equal the Calculation Rate.

(3)    The Class R-3 Interest is the sole class of residual interest in REMIC 3.
      It has no principal balance and pays no principal or interest.

                                The Master REMIC

      The following table sets forth characteristics of the Certificates,
together with the minimum denominations and integral multiples in excess thereof
in which such Classes shall be issuable (except that one Certificate of each
Class of Certificates may be issued in a different amount):

<TABLE>
<CAPTION>
============================ =========================== ============================== ====================== =====================
                                                                                                                    Integral
                                    Initial Class                                                 Minimum            Multiples in
     Class Designation            Certificate Balance            Pass-Through Rate               Denomination       Excess of Minimum
____________________________ ___________________________ ______________________________ ______________________ _____________________
<S>                               <C>                            <C>                          <C>                   <C>
       Class 1-A-1                        $50,000,000              Floating (1)                $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
       Class 1-A-2                         $6,521,739              Floating (2)                $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
       Class 1-A-3                        $93,816,261                  5.75%                  $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
       Class 1-A-4                        $16,556,000                  5.75%                  $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
       Class 2-A-1                       $176,182,000              Floating (3)               $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
       Class 2-A-2                   $176,182,000 (4)               Floating (5)               $       100,000 (6)            $1,000 (6)
____________________________ ___________________________ ______________________________ ______________________ _____________________
         Class PO                        $819,861 (7)                  N/A                     $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
        Class A-R                             $100.00                5.75%                    $           100              N/A
____________________________ ___________________________ ______________________________ ______________________ _____________________
        Class B-1                          $9,511,000                 (8)                     $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
       Class B-1IO                     $9,511,000 (4)               0.3937%                   $       100,000 (6)            $1,000 (6)
____________________________ ___________________________ ______________________________ ______________________ _____________________
        Class B-2                           $4,207,000                 (9)                     $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
       Class B-2IO                      $4,207,000 (4)               0.1437%                   $       100,000 (6)            $1,000 (6)
____________________________ ___________________________ ______________________________ ______________________ _____________________
        Class B-3                           $3,110,000                 (10)                    $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
        Class B-4                           $2,012,000                 (10)                    $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
        Class B-5                           $1,646,000                 (10)                    $       100,000                $1,000
____________________________ ___________________________ ______________________________ ______________________ _____________________
        Class B-6                          $1,463,629                 (10)                    $       100,000                $1,000
============================ =========================== ============================== ====================== =====================
</TABLE>

(1)    The Class 1-A-1 Certificates will bear interest during each Interest
      Accrual Period at a per annum rate equal to the lesser of (i) LIBOR plus
      0.45% and (ii) 5.75%. The Pass-Through Rate for the Class 1-A-1
      Certificates during the initial Interest Accrual Period is 5.77% per
      annum.

(2)    The Class 1-A-2 Certificates will bear interest during each Interest
      Accrual Period at a per annum rate equal to 46.38333317% minus (LIBOR
      multiplied by 7.66666636), subject to a maximum of 46.38333317% and a
      minimum of 0%. The Pass Through Rate for the Class 1-A-2 Certificates
      during the initial Interest Accrual Period is 5.5967% per annum.

(3)    The Class 2-A-1 Certificates will bear interest during each Interest
      Accrual Period at a per annum rate equal to the lesser of (i) LIBOR plus
      0.31% and (ii) 7.00%. The Pass-Through Rate for the Class 2-A-1
      Certificates during the initial Interest Accrual Period is 5.63% per
      annum.

                                        5
<PAGE>

(4)    The Class 2-A-2, Class B-1IO and Class B-2IO Certificates will be Notional
      Amount Certificates, will have no Class Certificate Balances and will bear
      interest on their respective Notional Amounts.

(5)    The Class 2-A-2 Certificates will bear interest during each Interest
      Accrual Period at a per annum rate equal to 6.69% minus LIBOR, subject to
      a maximum of 7.00% and a minimum of 0%. The Pass Through Rate for the
      Class 2-A-2 Certificates during the initial Interest Accrual Period is
      1.37% per annum.

(6)    Denomination is based on Notional Amount.

(7)    The Class PO Certificates are Principal Only Certificates and are not
      entitled to receive distributions of interest.

(8)    The Pass-Through Rate for the Class B-1 Certificates for the Interest
      Accrual Period related to each Distribution Date will be a per annum rate
      equal to the Weighted Average Rate for that Interest Accrual Period minus
      0.3937%. The Pass-Through Rate for the Class B-1 Certificates for the
      first Interest Accrual Period is 5.9967% per annum.

(9)    The Pass-Through Rate for the Class B-2 Certificates for the Interest
      Accrual Period related to each Distribution Date will be a per annum rate
       equal to the Weighted Average Rate for that Interest Accrual Period minus
      0.1437%. The Pass-Through Rate for the Class B-1 Certificates for the
      first Interest Accrual Period is 6.2467% per annum.

(10)   The Pass-Through Rate for the Class of Subordinated Certificates for the
      Interest Accrual Period for any Distribution Date will be a per annum rate
      equal to the Weighted Average Rate. The Pass-Through Rate for this Class
      of Subordinated Certificates for the first Interest Accrual Period is
      6.3904% per annum.

      The foregoing REMIC structure is intended to cause all of the cash from
the Mortgage Loans to flow through to the Master REMIC as cash flow on a REMIC
regular interest, without creating any shortfall--actual or potential (other
than for credit losses) to any REMIC regular interest.

      Scheduled Principal Prepayments and Realized Losses will be allocated to
the same Lower Tier Interests in the same manner as such amounts are allocated
to the Master REMIC Classes referenced under the column titled "Allocation of
Principal."

                                       6
<PAGE>

Set forth below are designations of Classes of Certificates to the categories
used herein:

Accretion Directed Certificates........    None.

Accrual Certificates...................    None.

Book-Entry Certificates................    All Classes of Certificates other
                                          than the Physical Certificates.

COFI Certificates......................    None.

Component Certificates.................    Class 2-A-2 Certificates.

Components.............................    Class 2-A-2-IO, Class 2-A-2-P1 and
                                          Class 2-A-2-P2 Components.

Delay Certificates.....................    All interest-bearing Classes of
                                          Certificates other than any
                                          Non-Delay Certificates.

ERISA-Restricted Certificates..........    The Residual Certificates and the
                                           Private Certificates; the Retained
                                          Certificates until they have been
                                          the subject of an ERISA-Qualifying
                                           Underwriting; and Certificates of
                                          any Class that ceases to have a
                                          rating of BBB- (or its equivalent)
                                          or better from at least one Rating
                                          Agency.

Group 1 Senior Certificates............    Class 1-A-1, Class 1-A-2, Class
                                          1-A-3, Class 1-A-4 and Class A-R
                                          Certificates.

Group 1 Certificates...................    Group 1 Senior Certificates and the
                                          portions of the Subordinated
                                          Certificates related to Collateral
                                           Allocation Group 1.

Group 2 Senior Certificates............    Class 2-A-1 and Class 2-A-2
                                          Certificates.

Group 2 Certificates...................    Group 2 Senior Certificates and the
                                           portions of the Subordinated
                                          Certificates related to Collateral
                                          Allocation Group 2.

LIBOR Certificates.....................    Class 1-A-1, Class 1-A-2, Class
                                          2-A-1 and Class 2-A-2 Certificates.

Non-Delay Certificates.................    LIBOR Certificates.

Notional Amount Certificates...........    Class 2-A-2, Class B-1IO and Class
                                           B-2IO Certificates.

Notional Amount Components.............    Class 2-A-2-IO Component.

Offered Certificates...................    All Classes of Certificates other
                                          than the Private

                                        7
<PAGE>
                                          Certificates.

Physical Certificates..................    Class A-R Certificates and the
                                          Private Certificates.

Planned Principal Classes..............    None.

Principal Only Certificates............    Class PO Certificates.

Private Certificates...................    Class B-4, Class B-5 and Class B-6
                                          Certificates.

Rating Agencies........................    S&P and Fitch.

Regular Certificates...................    All Classes of Certificates other
                                          than the Class A-R Certificates.

Residual Certificate...................    Class A-R Certificates.

Retained Certificates..................    None.

Senior Certificates....................    Class 1-A-1, Class 1-A-2, Class
                                          1-A-3, Class 1-A-4, Class 2-A-1, Class
                                          2-A-2, Class PO and Class A-R
                                          Certificates.

Senior Certificate Group...............    The Group 1 Senior Certificates or
                                          the Group 2 Senior Certificates.

Subordinated Certificates..............    Class B-1, Class B-1IO, Class B-2,
                                          Class B-2IO, Class B-3, Class B-4,
                                          Class B-5 and Class B-6 Certificates.

Targeted Principal Classes.............    None.

Targeted Principal Component...........    None.

      With respect to any of the foregoing designations as to which the
corresponding reference is "None," all defined terms and provisions in this
Agreement relating solely to such designations shall be of no force or effect,
and any calculations in this Agreement incorporating references to such
designations shall be interpreted without reference to such designations and
amounts. Defined terms and provisions in this Agreement relating to statistical
rating agencies not designated above as Rating Agencies shall be of no force or
effect.

                                       8
<PAGE>

                                  ARTICLE ONE

                                   DEFINITIONS

      Section 1.01 Definitions.

      Unless the context requires a different meaning, capitalized terms are
used in this Agreement as defined below.

      Accretion Directed Certificates:   As specified in the Preliminary
Statement.

      Accretion Direction Rule:   Not applicable.

       Accrual Amount:   Not applicable.

      Accrual Certificates:   As specified in the Preliminary Statement.

      Accrual Termination Date:   Not applicable.

      Additional Designated Information:   As defined in Section 11.02.

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

      Adjusted Net Mortgage Rate: As to each Mortgage Loan and any Distribution
Date, the per annum rate equal to the Mortgage Rate of that Mortgage Loan (as of
the Due Date in the month preceding the month in which such Distribution Date
occurs) less the Expense Fee Rate for that Mortgage Loan.

      Adjustment Date:   Not applicable.

      Advance: The payment required to be made by the Servicer with respect to
any Distribution Date pursuant to Section 4.01, the amount of any such payment
being equal to the aggregate of payments of principal and interest (net of the
Servicing Fee) on the Mortgage Loans that were due during the related Due Period
and not received as of the close of business on the related Determination Date,
together with an amount equivalent to interest on each REO Property, net of any
net income from such REO Property, less the aggregate amount of any such
delinquent payments that the Servicer has determined would constitute a
Nonrecoverable Advance if advanced.

      Advance Notice: As defined in Section 4.01(b).

      Advance Deficiency: As defined in Section 4.01(b).

      Affiliate: With respect to any Person, any other Person controlling,
controlled or under common control with such Person. For 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 "controlling" and "controlled" shall have meanings
correlative to the foregoing. Affiliates also include any entities consolidated
with the requirements of generally accepted accounting principles.

      Agreement:   This Pooling and Servicing Agreement and all amendments and
supplements.

                                       9
<PAGE>

      Allocable Share: As to any Distribution Date and the Applicable Fraction
of any Mortgage Loan related to Collateral Allocation Group PO and with respect
to the Class PO Certificates, zero. As to any Distribution Date and the related
Applicable Fraction of any Mortgage Loan related to each Collateral Loan Group
(other than Collateral Allocation Group PO) and with respect to any related
Class of Certificates, the ratio that the amount calculated with respect to such
Distribution Date (A) with respect to the related Senior Certificates, pursuant
to clause (i) of the definition of Class Optimal Interest Distribution Amount
(without giving effect to any reduction of such amount pursuant to Section
4.02(d)) and (B) with respect to the Subordinated Certificates, pursuant to the
definition of Assumed Interest Amount or after a Senior Termination Date,
pursuant to clause (i) of the definition of Class Optimal Interest Distribution
Amount (without giving effect to any reduction of such amount pursuant to
Section 4.02(d)) bears to the amount calculated with respect to such
Distribution Date for each Class of Certificates pursuant to clause (i) of the
definition of Class Optimal Interest Distribution Amount (without giving effect
to any reduction of such amount pursuant to Section 4.02(d)) or the definition
of Assumed Interest Amount, as applicable.

      Amount Available for Senior Principal: As to any Distribution Date and any
Collateral Allocation Group, the related Available Funds for such Distribution
Date, reduced by the aggregate amount distributable (or allocable to the Accrual
Amount, if applicable) on such Distribution Date in respect of interest on the
related Senior Certificates pursuant to Section 4.02(a)(1)(iii), Section
4.02(a)(2)(iii) or Section 4.02(a)(3).

      Amount Held for Future Distribution: As to any Distribution Date and
Collateral Allocation Group, the aggregate amount held in the Certificate
Account at the close of business on the related Determination Date on account of
the related Applicable Fraction of (i) Principal Prepayments received after the
last day of the related Prepayment Period and Liquidation Proceeds and
Subsequent Recoveries received in the month of such Distribution Date and (ii)
all Scheduled Payments due after the related Due Date.

      Applicable Credit Support Percentage:   As defined in Section 4.02(e).

      Applicable Fraction: With respect to any Mortgage Loan and a Collateral
Allocation Group, the percentage for such Mortgage Loan and Collateral
Allocation Group set forth on the Mortgage Loan Schedule and calculated as
follows:

<TABLE>
<CAPTION>
Mortgage Loan in the                  Collateral Allocation             Collateral Allocation             Collateral Allocation
following subpools:                          Group PO                          Group 1                           Group 2
-----------------------------     -----------------------------     -----------------------------     -----------------------------
<S>                               <C>                                  <C>                               <C>
Subpool A-1..................     5.75% - Adjusted Net Mortgage         Adjusted Net Mortgage
                                    Rate of the Pool A Loan           Rate of the Pool A Loan                     0.00%
                                 -----------------------------     -----------------------------
                                              5.75%                             5.75%

                                       10
<PAGE>

                                                                       7.00% - Adjusted Net            100% - (7.00% - Adjusted
Subpool A-2..................                 0.00%                   Mortgage Rate of the Pool          Net Mortgage Rate of the
                                                                              A Loan                          Pool A Loan
                                                                   -----------------------------     -----------------------------
                                                                              1.25%                             1.25%)

Subpool B-1..................     5.75% - Adjusted Net Mortgage         Adjusted Net Mortgage
                                    Rate of the Pool B Loan           Rate of the Pool B Loan                     0.00%
                                 -----------------------------     -----------------------------
                                             5.75%                             5.75%


Subpool B-2..................                 0.00%                      7.00% - Adjusted Net            100% - (7.00% - Adjusted
                                                                     Mortgage Rate of the Pool          Net Mortgage Rate of the
                                                                              B Loan                          Pool B Loan
                                                                   -----------------------------     -----------------------------
                                                                              1.25%                             1.25%)
</TABLE>


      Appraised Value: With respect to any Mortgage Loan, the Appraised Value of
the related Mortgaged Property shall be: (i) with respect to a Mortgage Loan
other than a Refinance Loan, the lesser of (a) the value of the Mortgaged
Property based upon the appraisal made at the time of the origination of such
Mortgage Loan and (b) the sales price of the Mortgaged Property at the time of
the origination of such Mortgage Loan; and (ii) with respect to a Refinance
Loan, the value of the Mortgaged Property based upon the appraisal made at the
time of the origination of such Refinance Loan.

      Assumed Balance: For a Distribution Date and Collateral Allocation Group
(other than Collateral Allocation Group PO), is equal to the Subordinated
Percentage for that Distribution Date and Collateral Allocation Group of the
related Applicable Fraction of the aggregate Stated Principal Balance of each
Mortgage Loan as of the Due Date occurring in the month prior to the month of
that Distribution Date (after giving effect to Principal Prepayments received in
the Prepayment Period related to such Due Date).

      Assumed Interest Amount: With respect to any Distribution Date and each
Class of Subordinated Certificates, other than any Notional Amount Certificates,
one month's interest accrued during the related Interest Accrual Period at the
Pass-Through Rate for such Class on the applicable Assumed Balance immediately
prior to that Distribution Date.

      Available Funds: As to any Distribution Date and the Mortgage Loans in a
Collateral Allocation Group, the sum of the related Applicable Fraction of each
of the following (a) the amounts held in the Certificate Account at the close of
business on the related Determination Date, including any Subsequent Recoveries,
net of the related Amount Held for Future Distribution, net of Prepayment
Charges and net of amounts permitted to be withdrawn from the Certificate
Account pursuant to clauses (i) - (viii), inclusive, of Section 3.09(a) and
amounts permitted to be withdrawn from the Distribution Account pursuant to
clauses (i) - (ii), inclusive, of Section 3.09(b), in each case relating to such
Collateral Allocation Group, (b) the amount of the related Advance, (c) in
connection with Defective Mortgage Loans in such Collateral Allocation Group, as
applicable, the aggregate of the Purchase Prices and Substitution Adjustment
Amounts deposited on the related Distribution Account Deposit Date, and (d) any
amount deposited on the related Distribution Account Deposit Date pursuant to
Section 3.10, in each case relating to such Collateral Allocation Group. The
Holders of the Class 2-A-2 Certificates will be entitled to all Prepayment
Charges received on the Mortgage Loans and such amounts will not be available
for distribution to the Holders of any other Class of Certificates.

                                        11
<PAGE>

      Bankruptcy Code:   The United States Bankruptcy Reform Act of 1978, as
amended.

      Bankruptcy Coverage Termination Date:   The point in time at which the
Bankruptcy Loss Coverage Amount is reduced to zero.

      Bankruptcy Loss: With respect to any Mortgage Loan, a Deficient Valuation
or Debt Service Reduction; provided, however, that a Bankruptcy Loss shall not
be deemed a Bankruptcy Loss under this Agreement so long as the Servicer has
notified the Trustee in writing that the Servicer is diligently pursuing any
remedies that may exist in connection with the related Mortgage Loan and either
(A) the related Mortgage Loan is not in default with regard to payments due
under the Mortgage Loan or (B) delinquent payments of principal and interest
under the related Mortgage Loan and any related escrow payments in respect of
such Mortgage Loan are being advanced on a current basis by the Servicer, in
either case without giving effect to any Debt Service Reduction or Deficient
Valuation.

      Bankruptcy Loss Coverage Amount: As of any date of determination, the
Bankruptcy Loss Coverage Amount shall equal the Initial Bankruptcy Loss Coverage
Amount as reduced by (i) the aggregate amount of Bankruptcy Losses allocated to
the Certificates since the Cut-off Date and (ii) any permissible reductions in
the Bankruptcy Loss Coverage Amount as evidenced by a letter of each Rating
Agency to the Trustee to the effect that any such reduction will not result in a
downgrading, qualification or withdrawal of the then current ratings assigned to
the Classes of Certificates rated by it.

      Blanket Mortgage:   The mortgage or mortgages encumbering a Cooperative
Property.

      Book-Entry Certificates:   As specified in the Preliminary Statement.

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

      Calculation Rate: For each Distribution Date, the product of (i) 10 and
(ii) the weighted average pass-through rate of the outstanding Class A and Class
B Interests, treating each of the Class A Interests as capped at zero.

      Certificate: Any one of the certificates issued by the Trust Fund and
executed by the Trustee in substantially the forms attached as exhibits.

      Certificate Account: The separate Eligible Account or Accounts created and
maintained by the Servicer pursuant to Section 3.06(d) with a depository
institution in the name of the Servicer for the benefit of the Trustee on behalf
of Certificateholders and designated "IndyMac Bank, F.S.B., in trust for the
registered holders of Residential Asset Securitization Trust 2007-A3, Mortgage
Pass-Through Certificates, Series 2007-C."

      Certificate Balance: With respect to any Certificate (other than the
Notional Amount Certificates) at any date of determination, the maximum dollar
amount of principal to which the Holder thereof is then entitled under this
Agreement, such amount being equal to the Denomination thereof (A) plus any
increase in the Certificate Balance of such Certificate pursuant to Section 4.02
due to the receipt of Subsequent Recoveries, (B) minus the sum of (i) all
distributions of principal previously made with respect thereto and (ii) all
Realized Losses allocated to that Certificate and, in the case of any
Subordinated Certificates, all other reductions in Certificate Balance
previously allocated to that Certificate pursuant to Section 4.05 and (C) in the
case of any Class of Accrual Certificates, plus the

                                       12
<PAGE>

Accrual Amount added to the Class Certificate Balance of such Class prior to
such date. The Notional Amount Certificates do not have Certificate Balances.

      Certificate Group:   The Group 1 Certificates or the Group 2
Certificates, as applicable.

      Certificate Owner: With respect to a Book-Entry Certificate, the Person
who is the beneficial owner of the Book-Entry Certificate. For the purposes of
this Agreement, in order for a Certificate Owner to enforce any of its rights
under this Agreement, it shall first have to provide evidence of its beneficial
ownership interest in a Certificate that is reasonably satisfactory to the
Trustee, the Depositor and/or the Servicer, as applicable.

      Certificate Register:   The register maintained pursuant to Section 5.02.

      Certificate Registrar:   Deutsche Bank National Trust Company and its
successors and, if a successor trustee is appointed under this Agreement, the
successor.

      Certificateholder or Holder: The person in whose name a Certificate is
registered in the Certificate Register, 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 Depositor is not 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 a consent has been obtained, except that if the Depositor or its
affiliates own 100% of the Percentage Interests evidenced by a Class of
Certificates, the Certificates shall be Outstanding for purposes of any
provision of this Agreement requiring the consent of the Holders of Certificates
of a particular Class as a condition to the taking of any action. 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.

      Certification Party:   As defined in Section 11.05.

      Certifying Person:   As defined in Section 11.05.

      Class:   All Certificates bearing the same class designation as set
forth in the Preliminary Statement.

      Class Certificate Balance: For any Class as of any date of
determination, the aggregate of the Certificate Balances of all Certificates
of the Class as of that date.

      Class Interest Shortfall: As to any Distribution Date and Class, the
amount by which the amount described in clause (i) of the definition of Class
Optimal Interest Distribution Amount for such Class exceeds the amount of
interest actually distributed on such Class on such Distribution Date pursuant
to such clause (i).

      Class Optimal Interest Distribution Amount: With respect to any
Distribution Date and interest-bearing Class, the sum of (i) one month's
interest accrued during the related Interest Accrual Period at the Pass-Through
Rate for such Class or Component, on the related Class Certificate Balance,
Notional Amount or Component Notional Amount, as applicable, immediately prior
to such Distribution Date, subject to reduction pursuant to Section 4.02(d), and
(ii) any Class Unpaid Interest Amounts for such Class.

      Class PO Deferred Amount: As to any Distribution Date, the related
Applicable Fraction of each Realized Loss, other than any Excess Loss, on a
Discount Mortgage Loan to be allocated to the Class PO

                                       13
<PAGE>

Certificates on such Distribution Date on or prior to the Senior Credit Support
Depletion Date or previously allocated to the Class PO Certificates and not yet
paid to the Holders of the Class PO Certificates.

      Class Subordination Percentage: With respect to any Distribution Date and
each Class of Subordinated Certificates, the fraction (expressed as a
percentage) the numerator of which is the Class Certificate Balance of such
Class of Subordinated Certificates immediately prior to such Distribution Date
and the denominator of which is the aggregate Class Certificate Balance of all
Classes of Certificates immediately prior to such Distribution Date.

      Class Unpaid Interest Amounts: As to any Distribution Date and Class of
interest-bearing Certificates, the amount by which the aggregate Class Interest
Shortfalls for such Class on prior Distribution Dates exceeds the amount
distributed on such Class on prior Distribution Dates pursuant to clause (ii) of
the definition of Class Optimal Interest Distribution Amount.

      Closing Date:   February 27, 2007.

      CMT Index:   Not applicable.

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

      COFI:   Not applicable.

      COFI Certificates:   Not applicable.

      Collateral Allocation Group:   Collateral Allocation Group PO,
Collateral Allocation Group 1 or Collateral Allocation Group 2, as applicable.

      Collateral Allocation Group 1: For any Distribution Date, all of the
Mortgage Loans in Subpool A-1, Subpool A-2, Subpool B-1 and Subpool B-2 or
portions thereof that have been stripped to a rate of 5.75%.

      Collateral Allocation Group 2: For any Distribution Date, all of the
Mortgage Loans in Subpool A-2 and Subpool B-2 or portions thereof that have been
stripped to a rate of 7.00%.

      Collateral Allocation Group PO: For any Distribution Date, all of the
Discount Mortgage Loans in Subpool A-1 and Subpool B-1 or portions thereof that
have been stripped to a rate of 0.00%.

      Commission:   The United States Securities and Exchange Commission.

      Compensating Interest: For any Distribution Date, 0.125% multiplied by
one-twelfth multiplied by the aggregate Stated Principal Balance of the Mortgage
Loans as of the first day of the prior month.

      Components:   As specified in the Preliminary Statement.

      Component Balance: With respect to any Component and any Distribution
Date, its Initial Component Balance (A) plus any Subsequent Recoveries added to
the Component Balance of such Component pursuant to Section 4.02, (B) minus the
sum of all amounts applied in reduction of the principal balance of such
Component and Realized Losses allocated thereto and increased due to the receipt
of Subsequent Recoveries.

      Component Certificates:   As specified in the Preliminary Statement.

                                       14
<PAGE>

      Component Notional Amount: For the Class 2-A-2-IO Component for the
Interest Accrual Period related to each Distribution Date, the Class Certificate
Balance of the Class 2-A-1 Certificates immediately prior to such Distribution
Date.

      Co-op Shares:   Shares issued by a Cooperative Corporation.

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

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

      Cooperative Property: The real property and improvements owned by the
Cooperative Corporation, including the allocation of individual dwelling units
to the holders of the Co-op Shares of the Cooperative Corporation.

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

      Corporate Trust Office: The designated office of the Trustee in the State
of California at which at any particular time its corporate trust business with
respect to this Agreement is administered, which office at the date of the
execution of this Agreement is located at 1761 East St. Andrew Place, Santa Ana,
California 92705, Attn: Mortgage Administration-IN0703 (IndyMac MBS, Inc.,
Residential Asset Securitization Trust 2007-A3, Mortgage Pass-Through
Certificates, Series 2007-C), and which is the address to which notices to and
correspondence with the Trustee should be directed. With respect to the
Certificate Registrar, the designated office for presentment and surrender of
Certificates for registration transfer, exchange or final payment thereof is
located at DB Services Tennessee, 648 Grassmere Park Road, Nashville, Tennessee,
37211-3658, Attention: Transfer Unit.

      Cut-off Date:   February 1, 2007.

      Cut-off Date Pool Principal Balance:   $371,388,138.32.

      Cut-off Date Principal Balance:   As to any Mortgage Loan, its Stated
Principal Balance as of the close of business on the Cut-off Date.

      Debt Service Reduction: For any Mortgage Loan, a reduction by a court of
competent jurisdiction in a proceeding under the Bankruptcy Code in the
Scheduled Payment for the Mortgage Loan that became final and non-appealable,
except a reduction resulting from a Deficient Valuation or a reduction that
results in a permanent forgiveness of principal.

      Defective Mortgage Loan: Any Mortgage Loan that is required to be
repurchased pursuant to Section 2.02 or 2.03.

      Deficient Valuation: For any Mortgage Loan, a valuation by a court of
competent jurisdiction of the Mortgaged Property in an amount less than the then
outstanding indebtedness under the Mortgage Loan, or any reduction in the amount
of principal to be paid in connection with any Scheduled Payment that results in
a permanent forgiveness of principal, which valuation or reduction results from
an order of the court that is final and non-appealable in a proceeding under the
Bankruptcy Code.

                                       15
<PAGE>

      Definitive Certificates:   Any Certificate evidenced by a Physical
Certificate and any Certificate issued in lieu of a Book-Entry Certificate
pursuant to Section 5.02(e).

      Delay Certificates:   As specified in the Preliminary Statement.

      Delay Delivery Certification:   A certification substantially in the
form of Exhibit G-2.

      Delay Delivery Mortgage Loans: The Mortgage Loans identified on the
Mortgage Loan Schedule for which none of a related Mortgage File or neither the
Mortgage Note nor a lost note affidavit for a lost Mortgage Note has been
delivered to the Trustee by the Closing Date. The Depositor shall deliver the
Mortgage Files to the Trustee:

      (A) for at least 70% of the Mortgage Loans, not later than the Closing
Date, and

      (B) for the remaining 30% of the Mortgage Loans, not later than five
Business Days following the Closing Date.

      To the extent that the Seller is in possession of any Mortgage File for
any Delay Delivery Mortgage Loan, until delivery of the Mortgage File to the
Trustee as provided in Section 2.01, the Seller shall hold the files as
Servicer, as agent and in trust for the Trustee.

      Deleted Mortgage Loan:   As defined in Section 2.03(c).

      Delinquent: A Mortgage Loan is "Delinquent" if any monthly payment due on
a Due Date is not made by the close of business on the next scheduled Due Date
for such Mortgage Loan. A Mortgage Loan is "30 days Delinquent" if such monthly
payment has not been received by the close of business on the corresponding day
of the month immediately succeeding the month in which such monthly payment was
due. The determination of whether a Mortgage Loan is "60 days Delinquent", "90
days Delinquent", etc. shall be made in a like manner.

      Denomination: For each Certificate, the amount on the face of the
Certificate as the "Initial Certificate Balance of this Certificate" or the
"Initial Notional Amount of this Certificate" or, if neither of the foregoing,
the Percentage Interest appearing on the face of the Certificate.

      Depositor:   IndyMac MBS, Inc., a Delaware corporation, or its successor
in interest.

      Depository:   The initial Depository shall be The Depository Trust
Company, the nominee of which is CEDE & Co., as the registered Holder of the
Book-Entry Certificates.   The Depository shall at all times be a "clearing
corporation" as defined in Section 8-102(a)(5) of the UCC.

      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.

      Determination Date: As to any Distribution Date, the 18th day of each
month or if that day is not a Business Day the next Business Day, except that if
the next Business Day is less than two Business Days before the related
Distribution Date, then the Determination Date shall be the Business Day
preceding the 18th day of the month.

      Discount Mortgage Loan: Any Mortgage Loan with an Adjusted Net Mortgage
Rate that is less than 5.75%.

                                       16
<PAGE>

      Distribution Account: The separate Eligible Account created and maintained
by the Trustee pursuant to Section 3.06(e) in the name of the Trustee for the
benefit of the Certificateholders and designated "Deutsche Bank National Trust
Company in trust for registered holders of Residential Asset Securitization
Trust 2007-A3, Mortgage Pass-Through Certificates, Series 2007-C." Funds in the
Distribution Account shall be held in trust for the Certificateholders for the
uses and purposes set forth in this Agreement.

      Distribution Account Deposit Date: As to any Distribution Date, 12:30 P.M.
Pacific time on the Business Day preceding the Distribution Date.

      Distribution Date: The 25th day of each calendar month after the initial
issuance of the Certificates, or if that day is not a Business Day, the next
Business Day, commencing in March 2007.

      Due Date: For any Mortgage Loan and Distribution Date, the first day of
the month in which such Distribution Date occurs.

      Due Period: For any Distribution Date, the period commencing on the second
day of the month preceding the month in which the Distribution Date occurs and
ending on the first day of the month in which the Distribution Date occurs.

      EDGAR:   The Commission's Electronic Data Gathering, Analysis and
Retrieval system.

      Eligible Account: Any of

      (i) an account or accounts maintained with a federal or state chartered
depository institution or trust company the short-term unsecured debt
obligations of which (or, in the case of a depository institution or trust
company that is the principal subsidiary of a holding company, the debt
obligations of such holding company) have the highest short-term ratings of
Moody's or Fitch and one of two highest short-term ratings of S&P, if S&P is a
Rating Agency at the time any amounts are held on deposit therein, or

       (ii) an account or accounts in a depository institution or trust company
in which such accounts are insured by the FDIC (to the limits established by the
FDIC) and the uninsured deposits in which accounts are otherwise secured such
that, as evidenced by an Opinion of Counsel delivered to the Trustee and to each
Rating Agency, the Certificateholders have a claim with respect to the funds in
such account or a perfected first priority 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 or trust company in which such account is maintained, or

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

      (iv) any other account acceptable to each Rating Agency.

Eligible Accounts may bear interest, and may include, if otherwise qualified
under this definition, accounts maintained with the Trustee.

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

      ERISA-Qualifying Underwriting: A best efforts or firm commitment
underwriting or private placement that meets the requirements of the
Underwriter's Exemption.

                                       17
<PAGE>

      ERISA-Restricted Certificate: As specified in the Preliminary Statement.

      Escrow Account: The Eligible Account or Accounts established and
maintained pursuant to Section 3.07(a).

      Event of Default:   As defined in Section 7.01.

      Excess Loss: The amount of any (i) Fraud Loss on the Mortgage Loans
realized after the Fraud Loss Coverage Termination Date, (ii) Special Hazard
Loss on the Mortgage Loans realized after the Special Hazard Coverage
Termination Date or (iii) Bankruptcy Loss on the Mortgage Loans realized after
the Bankruptcy Coverage Termination Date.

      Excess Proceeds:   For any Liquidated Mortgage Loan, the excess of

      (a) all Liquidation Proceeds from the Mortgage Loan received in the
calendar month in which the Mortgage Loan became a Liquidated Mortgage Loan, net
of any amounts previously reimbursed to the Servicer as Nonrecoverable Advances
with respect to the Mortgage Loan pursuant to Section 3.09(a)(iii), over

      (b) the sum of (i) the unpaid principal balance of the Liquidated Mortgage
Loan as of the Due Date in the month in which the Mortgage Loan became a
Liquidated Mortgage Loan plus (ii) accrued interest at the Mortgage Rate from
the Due Date for which interest was last paid or advanced (and not reimbursed)
to Certificateholders up to the Due Date applicable to the Distribution Date
following the calendar month during which the liquidation occurred.

      Exchange Act: The Securities Exchange Act of 1934, as amended, and the
rules and regulations promulgated thereunder.

      Exchange Act Reports: Any reports on Form 10-D, Form 8-K and Form 10-K
required to be filed by the Depositor with respect to the Trust Fund under the
Exchange Act.

      Expense Fee Rate: As to each Mortgage Loan, the sum of (a) the related
Servicing Fee Rate and (b) the Trustee Fee Rate.

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

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

      Fitch: Fitch, Inc., or any successor thereto. If Fitch is designated as a
Rating Agency in the Preliminary Statement, for purposes of Section 10.05(b) the
address for notices to Fitch shall be Fitch, Inc., One State Street Plaza, New
York, NY 10004, Attention: MBS Monitoring - IndyMac 2007-C, or any other address
Fitch furnishes to the Depositor and the Servicer.

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

                                       18
<PAGE>

      Form 10-D Disclosure Item: With respect to any Person, any material
litigation or governmental proceedings pending against such Person, or against
any of the Trust Fund, the Depositor, the Trustee or the Servicer, if such
Person has actual knowledge thereof.

      Form 10-K Disclosure Item: With respect to any Person, (a) Form 10-D
Disclosure Item, and (b) any affiliations or relationships between such Person
and any Item 1119 Party.

      Fraud Loan: A Liquidated Mortgage Loan as to which a Fraud Loss has
occurred.

      Fraud Loss Coverage Amount: As of the Closing Date, $7,427,763, subject to
reduction from time to time, by the amount of Fraud Losses allocated to the
Certificates. In addition, on each anniversary of the Cut-off Date, the Fraud
Loss Coverage Amount will be reduced as follows: (a) on the first, second, third
and fourth anniversaries of the Cut-off Date, to an amount equal to the lesser
of (i) 2% of the then current Stated Principal Balance of the Mortgage Loans in
the case of the first such anniversary and 1% of the then-current Stated
Principal Balance of the Mortgage Loans in the case of the second, third and
fourth such anniversaries and (ii) the excess of the Fraud Loss Coverage Amount
as of the preceding anniversary of the Cut-off Date over the cumulative amount
of Fraud Losses allocated to the Certificates since such preceding anniversary;
and (b) on the fifth anniversary of the Cut-off Date, to zero.

      Fraud Loss Coverage Termination Date: The point in time at which the Fraud
Loss Coverage Amount is reduced to zero.

      Fraud Losses: Realized Losses on Mortgage Loans as to which a loss is
sustained by reason of a default arising from fraud, dishonesty or
misrepresentation in connection with the related Mortgage Loan, including a loss
by reason of the denial of coverage under any related Primary Insurance Policy
because of such fraud, dishonesty or misrepresentation.

      Gross Margin:   Not applicable.

      Group 1 Certificates:   As specified in the Preliminary Statement.

      Group 1 Senior Certificates:   As specified in the Preliminary Statement.

      Group 2 Certificates:   As specified in the Preliminary Statement.

      Group 2 Senior Certificates:   As specified in the Preliminary Statement.

      Index:   Not applicable.

      Indirect Participant: A broker, dealer, bank, or other financial
institution or other Person that clears through or maintains a custodial
relationship with a Depository Participant.

      Initial Bankruptcy Loss Coverage Amount:   $128,013.

      Initial Component Balance:   As specified in the Preliminary Statement.

      Initial LIBOR Rate:   5.32% per annum.

      Insurance Policy: For any Mortgage Loan included in the Trust Fund, any
insurance policy, including all riders and endorsements thereto in effect,
including any replacement policy or policies for any Insurance Policies.

                                       19
<PAGE>

       Insurance Proceeds: Proceeds paid by an insurer pursuant to any Insurance
Policy, 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 the Mortgage Loans.

      Interest Accrual Period: With respect to each Class of Delay Certificates
and any Distribution Date, the calendar month prior to the month of such
Distribution Date. With respect to each Class of Non-Delay Certificates and any
Distribution Date, the one-month period commencing on the 25th day of the month
preceding the month in which such Distribution Date occurs and ending on the
24th day of the month in which such Distribution Date occurs. All Classes of
Certificates will accrue interest on the basis of a 360-day year consisting of
twelve 30-day months.

      Interest Determination Date: With respect to (a) any Interest Accrual
Period for any LIBOR Certificates and (b) any Interest Accrual Period for the
COFI Certificates for which the applicable Index is LIBOR, the second Business
Day prior to the first day of such Interest Accrual Period.

      Interest Settlement Rate:   As defined in Section 4.09.

      Item 1119 Party: The Depositor, the Seller, the Servicer, the Trustee and
any other material transaction party, as identified in Exhibit T, as updated
pursuant to Section 11.04.

      Latest Possible Maturity Date: The Distribution Date following the third
anniversary of the later of (i) the scheduled maturity date of the Mortgage Loan
having the latest scheduled maturity date as of the Cut-off Date, and (ii) the
latest possible maturity of any Substitute Mortgage Loan that may be substituted
for any Mortgage Loan pursuant to this Agreement.

      Lender PMI Loans: Mortgage Loans with respect to which the lender rather
than the borrower acquired the primary mortgage guaranty insurance and charged
the related borrower an interest premium.

      LIBOR: The London interbank offered rate for one month United States
dollar deposits calculated in the manner described in Section 4.09.

      LIBOR Determination Date: For any Interest Accrual Period, the second
London Business Day prior to the commencement of such Interest Accrual Period.

      Limited Exchange Act Reporting Obligations: The obligations of the
Servicer under Section 3.17(b), Section 6.02 and Section 6.04 with respect to
notice and information to be provided to the Depositor and Article 11 (except
Section 11.07(a)(i) and (ii)).

      Liquidated Mortgage Loan: For any Distribution Date, a defaulted Mortgage
Loan (including any REO Property) that was liquidated in the calendar month
preceding the month of the Distribution Date and as to which the Servicer has
certified (in accordance with this Agreement) that it has received all amounts
it expects to receive in connection with the liquidation of the Mortgage Loan,
including the final disposition of an REO Property.

      Liquidation Proceeds: Amounts, including Insurance Proceeds regardless of
when received, received in connection with the partial or complete liquidation
of defaulted Mortgage Loans, whether

                                       20
<PAGE>

through trustee's sale, foreclosure sale, 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
related unreimbursed Servicing Fees, Servicing Advances, and Advances.

      Loan-to-Value Ratio: For any Mortgage Loan and as of any date of
determination, is the fraction whose numerator is the original principal balance
of the related Mortgage Loan at that date of determination and whose denominator
is the Appraised Value of the related Mortgaged Property.

      London Business Day: Any day on which dealings in deposits of United
States dollars are transacted in the London interbank market.

      Lost Mortgage Note: Any Mortgage Note the original of which was
permanently lost or destroyed and has not been replaced.

      Maintenance: For any Cooperative Unit, the rent paid by the Mortgagor to
the Cooperative Corporation pursuant to the Proprietary Lease.

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

      MERS Mortgage Loan:   Any Mortgage Loan registered with MERS on the
MERS(R) System.

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

      MIN:   The mortgage identification number for any MERS Mortgage Loan.

      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.

      Moneyline Telerate Page 3750: The display page currently so designated on
the Moneyline Telerate Information Services, Inc. (or any page replacing that
page on that service for the purpose of displaying London inter-bank offered
rates of major banks).

      Monthly Statement:   The statement delivered to the Certificateholders
pursuant to Section 4.06.

      Moody's:   Moody's Investors Service, Inc., or any successor thereto.
If Moody's is designated as a Rating Agency in the Preliminary Statement, for
purposes of Section 10.05(b) the address for notices to Moody's shall be
Moody's Investors Service, Inc., 99 Church Street, New York, New York 10007,
Attention: Residential Loan Monitoring Group, or any other address that
Moody's furnishes to the Depositor and the Servicer.

      Mortgage: The mortgage, deed of trust, or other instrument creating a
first lien on an estate in fee simple or leasehold interest in real property
securing a Mortgage Note.

      Mortgage File: The mortgage documents listed in Section 2.01 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.

                                       21
<PAGE>

      Mortgage Loans: Such of the mortgage loans transferred and assigned to the
Trustee pursuant to this Agreement, 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 on the Mortgage Loan Schedule, notwithstanding foreclosure or other
acquisition of title of the related Mortgaged Property.

      Mortgage Loan Schedule: As of any date, the list set forth in Schedule I
of Mortgage Loans included in the Trust Fund on that date. The Mortgage Loan
Schedule shall be prepared by the Seller and shall set forth the following
information with respect to each Mortgage Loan:

              (i)     the loan number;

              (ii)    the street address of the Mortgaged Property, including the
                      zip code;

              (iii)   the maturity date;

              (iv)    the original principal balance;

              (v)     the Cut-off Date Principal Balance;

              (vi)    the first payment date of the Mortgage Loan;

              (vii)   the Scheduled Payment in effect as of the Cut-off Date;

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

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

              (x)     a code indicating whether the residential dwelling is
                     either (a) a detached single family dwelling, (b) a
                     dwelling in a PUD, (c) a condominium unit, (d) a two- to
                      four-unit residential property, or (e) a Cooperative Unit;

              (xi)    the Mortgage Rate;

              (xii)   the purpose for the Mortgage Loan;

              (xiii) the type of documentation program pursuant to which the
                      Mortgage Loan was originated;

              (xiv)   a code indicating whether the Mortgage Loan is a
                     borrower-paid mortgage insurance loan;

              (xv)    the Servicing Fee Rate;

              (xvi)   a code indicating whether the Mortgage Loan is a Lender PMI
                     Loan;

              (xvii) the coverage amount of any mortgage insurance;

              (xviii) with respect to the Lender PMI Loans, the interest premium
                     charged by the lender;

                                       22
<PAGE>

              (xix)   a code indicating whether the Mortgage Loan is a Delay
                     Delivery Mortgage Loan; and

              (xx)    a code indicating whether the Mortgage Loan is a MERS
                     Mortgage Loan.

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

      Mortgage Rate: The annual rate of interest borne by a Mortgage Note from
time to time (net of the interest premium for any Lender PMI Loan).

      Mortgage Pool:   Mortgage Pool A or Mortgage Pool B.

      Mortgage Pool A:   Pool A Loans.

      Mortgage Pool B:   Pool B Loans.

      Mortgaged Property: The underlying property securing a Mortgage Loan,
which, with respect to a Cooperative Loan, is the related Co-op Shares and
Proprietary Lease.

      Mortgagor:   The obligors on a Mortgage Note.

      National Cost of Funds Index:   The National Monthly Median Cost of
Funds Ratio to SAIF-Insured Institutions published by the OTS.

      Net Prepayment Interest Shortfall: As to any Distribution Date and
Collateral Allocation Group, the amount by which the aggregate of Prepayment
Interest Shortfalls for such Collateral Allocation Group exceeds an amount equal
to the sum of (a) the Compensating Interest allocable to such Collateral
Allocation Group for such Distribution Date and (b) the excess, if any, of the
Compensating Interest allocable to each other Collateral Allocation Group for
such Distribution Date over Prepayment Interest Shortfalls for such other
Collateral Allocation Group and Distribution Date.

      Non-Delay Certificates: As specified in the Preliminary Statement.

      Non-Discount Mortgage Loan: Each Mortgage Loan with an Adjusted Net
Mortgage Rate that is greater than or equal to 5.75%.

      Nonrecoverable 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 be ultimately recoverable by the Servicer from the related
Mortgagor, related Liquidation Proceeds or otherwise.

      Notice of Final Distribution: The notice to be provided pursuant to
Section 9.02 to the effect that final distribution on any of the Certificates
shall be made only upon presentation and surrender thereof.

      Notional Amount: With respect to the Class 2-A-2 Certificates and any
Distribution Date the Component Notional Amount of the Class 2-A-2IO Component
immediately prior to that Distribution Date. With respect to the Class B-1IO
Certificates and any Distribution Date, the Class Certificate Balance of the
Class B-1 Certificates immediately prior to that Distribution Date. With respect
to the Class B-2IO Certificates and any Distribution Date, the Class Certificate
Balance of the Class B-2 Certificates immediately prior to that Distribution
Date.

                                       23
<PAGE>

      Notional Amount Certificates:   As specified in the Preliminary
Statement.

      Offered Certificates:   As specified in the Preliminary Statement.

      Officer's Certificate: A certificate (i) signed by the Chairman of the
Board, the Vice Chairman of the Board, the President, a Managing Director, 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 the Servicer, or (ii) if provided for in this
Agreement, signed by a Servicing Officer, as the case may be, and delivered to
the Depositor and the Trustee as required by this Agreement.

      Opinion of Counsel: For the interpretation or application of the REMIC
Provisions, a written opinion of counsel who (i) is in fact independent of the
Depositor and the Servicer, (ii) does not have any direct financial interest in
the Depositor or the Servicer or in any affiliate of either, and (iii) is not
connected with the Depositor or the Servicer as an officer, employee, promoter,
underwriter, trustee, partner, director, or person performing similar functions.
Otherwise, a written opinion of counsel who may be counsel for the Depositor or
the Servicer, including in-house counsel, reasonably acceptable to the Trustee.

      Original Applicable Credit Support Percentage: With respect to each of the
following Classes of Subordinated Certificates, the corresponding percentage
described below:

                  Class B-1......................     5.99%
                  Class B-2......................     3.40%
                  Class B-3......................     2.25%
                  Class B-4......................     1.40%
                  Class B-5......................     0.85%
                  Class B-6......................     0.40%


      Original Mortgage Loan:   The Mortgage Loan refinanced in connection
with the origination of a Refinance Loan.

      Original Subordinated Principal Balance: On or prior to a Senior
Termination Date, the sum of the Subordinated Percentage for each Collateral
Allocation Group, other than Collateral Allocation Group PO, the related
Applicable Fraction of the aggregate Stated Principal Balance of the Mortgage
Loans as of the Cut-off Date; or if such date is after the Senior Termination
Date, the aggregate Class Certificate Balance of the Subordinated Certificates
as of the Closing Date.

      OTS:   The Office of Thrift Supervision.

      Outside Reference Date:   Not applicable.

      Outstanding: For the Certificates as of any date of determination, all
Certificates theretofore executed and authenticated under this Agreement
except:

            (i)    Certificates theretofore canceled by the Trustee or delivered
                  to the Trustee for cancellation; and

            (ii)   Certificates in exchange for which or in lieu of which other
                  Certificates have been executed and delivered by the Trustee
                  pursuant to this Agreement.

                                       24
<PAGE>

      Outstanding Mortgage Loan: As of any Due Date, a Mortgage Loan with a
Stated Principal Balance greater than zero that was not the subject of a
Principal Prepayment in Full before the Due Date or during the related
Prepayment Period and that did not become a Liquidated Mortgage Loan before the
Due Date.

      Overcollateralized Group:   As defined in Section 4.03.

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

      Pass-Through Rate: For each Class of Certificates, the per annum rate set
forth or calculated in the manner described in the Preliminary Statement.

      Percentage Interest: As to any Certificate, the percentage interest
evidenced thereby in distributions required to be made on the related Class, the
percentage interest being set forth on its face or equal to the percentage
obtained by dividing the Denomination of the Certificate by the aggregate of the
Denominations of all Certificates of the same Class.

      Performance Certification:   As defined in Section 11.05.

      Permitted Investments:   At any time, any of the following:

      (i) obligations of the United States or any agency thereof 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, or any lower rating that will not result in the
downgrading, qualification or withdrawal of the ratings then assigned to the
Certificates by the Rating Agencies, as evidenced by a signed writing delivered
by each Rating Agency;

      (iii) commercial or finance company paper that is then receiving the
highest commercial or finance company paper rating of each Rating Agency, or any
lower rating that will not result in the downgrading, qualification or
withdrawal of the ratings then assigned to the Certificates by the Rating
Agencies , as evidenced by a signed writing delivered by each Rating Agency;

      (iv) certificates of deposit, demand or time deposits, or bankers'
acceptances 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 or state banking authorities, provided
that the commercial paper or long-term unsecured debt obligations of the
depository institution or trust company (or in the case of the principal
depository institution in a holding company system, the commercial paper or
long-term unsecured debt obligations of the holding company, but only if Moody's
is not a Rating Agency) are then rated one of the two highest long-term and the
highest short-term ratings of each Rating Agency for the securities, or any
lower rating that will not result in the downgrading, qualification or
withdrawal of the ratings then assigned to the Certificates by the Rating
Agencies, as evidenced by a signed writing delivered by each Rating Agency;

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

                                       25
<PAGE>

      (vi) guaranteed reinvestment agreements issued by any bank, insurance
company, or other corporation acceptable to the Rating Agencies at the time of
the issuance of the agreements, as evidenced by a signed writing delivered by
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 (iv)
above; provided that such repurchase obligation would be accounted for as a
financing arrangement under generally accepted accounting principles;

      (viii) securities (other than stripped bonds, stripped coupons, or
instruments sold at a purchase price in excess of 115% of their face amount)
bearing interest or sold at a discount issued by any corporation incorporated
under the laws of the United States or any state thereof that, at the time of
the investment, have one of the two highest ratings of each Rating Agency
(except if the Rating Agency is Moody's the rating shall be the highest
commercial paper rating of Moody's for the securities), or any lower rating that
will not result in the downgrading, qualification or withdrawal of the ratings
then assigned to the Certificates by the Rating Agencies, as evidenced by a
signed writing delivered by each Rating Agency and that have a maturity date
occurring no more than 365 days from their date of issuance;

      (ix) units of a taxable money-market portfolio having the highest rating
assigned by each Rating Agency (except (i) if Fitch is a Rating Agency and has
not rated the portfolio, the highest rating assigned by Moody's and (ii) if S&P
is a Rating Agency, "AAAm" or "AAAM-N" by S&P) and restricted to obligations
issued or guaranteed by the United States of America or entities whose
obligations are backed by the full faith and credit of the United States of
America and repurchase agreements collateralized by such obligations; and

      (x) any other investments bearing interest or sold at a discount
acceptable to each Rating Agency that will not result in the downgrading,
qualification or withdrawal of the ratings then assigned to the Certificates by
the Rating Agencies, as evidenced by a signed writing delivered by each Rating
Agency.

      No Permitted Investment may (i) evidence the right to receive interest
only payments with respect to the obligations underlying the instrument, (ii) be
sold or disposed of before its maturity or (iii) be any obligation of the Seller
or any of its Affiliates. Any Permitted Investment shall be relatively risk free
and no options or voting rights shall be exercised with respect to any Permitted
Investment. Any Permitted Investment shall be sold or disposed of in accordance
with Financial Accounting Standard 140, paragraph 35c(6) in effect as of the
Closing Date.

      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 any Residual Certificate,

                                       26
<PAGE>

      (iv) a rural electric and telephone cooperatives described in section
1381(a)(2)(C) of the Code,

      (v) an "electing large partnership" as defined in section 775 of the Code,

      (vi) a Person that is not a U.S. Person, and

      (vii) any other Person so designated by the Depositor based on an Opinion
of Counsel that the Transfer of an Ownership Interest in a Residual Certificate
to the Person may cause any REMIC created hereunder to fail to qualify as a
REMIC at any time that the Certificates are outstanding.

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

      Physical Certificates:   As specified in the Preliminary Statement.

      Planned Balance:   Not applicable.

      Planned Principal Classes:   As specified in the Preliminary Statement.

      Pool A Loans: The Mortgage Loans with soft Prepayment Charges or no
Prepayment Charge as listed on the Mortgage Loan Schedule as being in Mortgage
Pool A.

      Pool B Loans: The Mortgage Loans with hard Prepayment Charges or no
Prepayment Charge listed on the Mortgage Loan Schedule as being in Mortgage Pool
B.

      Pool Stated Principal Balance:   The aggregate Stated Principal Balance
of the Mortgage Loans.

      Prepayment Assumption:   The prepayment model used in the Prospectus
Supplement.

      Prepayment Charge: As to a Mortgage Loan, any charge payable by a
Mortgagor in connection with certain partial prepayments and all prepayments in
full made within the related Prepayment Charge Period, the Prepayment Charges
with respect to each applicable Mortgage Loan so held by the Trust Fund being
identified in the Mortgage Loan Schedule.

      Prepayment Charge Period: As to any Mortgage Loan, the period of time
during which a Prepayment Charge may be imposed.

      Prepayment Interest Excess: As to any Principal Prepayment received by the
Servicer on a Mortgage Loan from the first day through the fifteenth day of any
calendar month other than the month of the Cut-off Date, all amounts paid by the
related Mortgagor in respect of interest on such Principal Prepayment. All
Prepayment Interest Excess shall be retained by the Servicer as additional
servicing compensation.

      Prepayment Interest Shortfall: As to any Distribution Date, Mortgage Loan
and Principal Prepayment received on or after the sixteenth day of the month
preceding the month of such Distribution Date (or, in the case of the first
Distribution Date, on or after the Cut-off Date) and on or before the last day
of the month preceding the month of such Distribution Date, the amount, if any,
by which one month's interest at the related Mortgage Rate, net of the Servicing
Fee Rate, on such Principal Prepayment exceeds the amount of interest paid in
connection with such Principal Prepayment.

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<PAGE>

      Prepayment Period: As to any Distribution Date and related Due Date, the
period from and including the 16th day of the month immediately prior to the
month of such Distribution Date (or, in the case of the first Distribution Date,
from the Cut-off Date) and to and including the 15th day of the month of such
Distribution Date.

      Primary Insurance Policy: Each policy of primary mortgage guaranty
insurance or any replacement policy therefor with respect to any Mortgage Loan.

      Principal Amount: As to any Distribution Date and any Collateral
Allocation Group, the sum of (a) the related Applicable Fraction of all monthly
payments of principal due on each Mortgage Loan in the that Collateral
Allocation Group on the related Due Date, (b) the related Applicable Fraction of
the principal portion of the Purchase Price of each Mortgage Loan in the that
Collateral Allocation Group that was repurchased by the Seller pursuant to this
Agreement as of such Distribution Date, excluding any Mortgage Loan in the that
Collateral Allocation Group that was repurchased due to a modification of the
Mortgage Loan in lieu of refinancing, (c) the related Applicable Fraction of the
Substitution Adjustment Amount in connection with any Deleted Mortgage Loan in
the that Collateral Allocation Group received with respect to the Distribution
Date, (d) the related Applicable Fraction of any Insurance Proceeds or
Liquidation Proceeds allocable to recoveries of principal of Mortgage Loans in
the that Collateral Allocation Group that are not yet Liquidated Mortgage Loans
received during the calendar month preceding the month of such Distribution
Date, (e) the related Applicable Fraction with respect to each Mortgage Loan in
the that Collateral Allocation Group that became a Liquidated Mortgage Loan
during the calendar month preceding the month of such Distribution Date, the
amount of Liquidation Proceeds allocable to principal received with respect to
such Mortgage Loan, (f) the related Applicable Fraction of all partial and full
Principal Prepayments on the Mortgage Loans in the that Collateral Allocation
Group received during the related Prepayment Period and the principal portion of
the Purchase Price of any Mortgage Loan in the that Collateral Allocation Group
repurchased by the Seller pursuant to Section 3.12 and (g) the related
Applicable Fraction of any Subsequent Recoveries with respect to the Mortgage
Loans in the that Collateral Allocation Group received during the calendar month
preceding the month of such Distribution Date.

      Principal Balance Schedule:   Not applicable.

      Principal Only Certificates:   As specified in the Preliminary Statement.

      Principal Prepayment: Any payment of principal by a Mortgagor on a
Mortgage Loan (including the principal portion of the Purchase Price of any
Mortgage Loan purchased pursuant to Section 3.12) that is received in advance of
its scheduled Due Date and is not accompanied by an amount representing
scheduled interest due on any date in any month after the month of prepayment.
The Servicer shall apply partial Principal Prepayments in accordance with the
related Mortgage Note.

      Principal Prepayment in Full: Any Principal Prepayment made by a Mortgagor
of the entire principal balance of a Mortgage Loan.

      Priority Amount: For any Distribution Date and Collateral Allocation Group
1, the sum of (i) the product of (A) 66.5540158563563% of the Scheduled
Principal Distribution Amount, (B) the Senior Percentage, (C) the Shift
Percentage and (D) the Priority Percentage and (ii) the product of (A)
66.5540158563563% of the Unscheduled Principal Distribution Amount, (B) the
Senior Prepayment Percentage, (C) the Shift Percentage and (D) the Priority
Percentage.

      Priority Percentage: For any Distribution Date and Collateral Allocation
Group 1, the percentage equivalent of a fraction, the numerator of which is the
Class Certificate Balance of the Class 1-

                                       28
<PAGE>

A-4 Certificates immediately prior to such Distribution Date, and the
denominator of which is the aggregate Class Certificate Balance of the Class
1-A-3 and Class 1-A-4 Certificates immediately prior to such Distribution Date.

      Private Certificates:   As specified in the Preliminary Statement.

      Pro Rata Share: As to any Distribution Date and any Class of Subordinated
Certificates, the portion of the Subordinated Principal Distribution Amount
allocable to such Class, equal to the product of the Subordinated Principal
Distribution Amount on such Distribution Date and a fraction, the numerator of
which is the related Class Certificate Balance thereof and the denominator of
which is the aggregate Class Certificate Balance of the Subordinated
Certificates, in each case immediately prior to such Distribution Date.

      Proprietary Lease: For any Cooperative Unit, a lease or occupancy
agreement between a Cooperative Corporation and a holder of related Co-op
Shares.

      Prospectus Supplement: The Prospectus Supplement dated February 27, 2007,
relating to the Offered Certificates, and any supplement thereto.

      PUD:   Planned Unit Development.

      Purchase Price:   For any Mortgage Loan required to be purchased by the
Seller pursuant to Section 2.02 or 2.03 or purchased by the Servicer pursuant
to Section 3.12, the sum of

      (i) 100% of the unpaid principal balance of the Mortgage Loan on the date
of the purchase,

      (ii) accrued and unpaid interest on the Mortgage Loan at the applicable
Mortgage Rate (or at the applicable Adjusted Mortgage Rate if (x) the purchaser
is the Servicer or (y) if the purchaser is the Seller and the Seller is the
Servicer) from the date through which interest was last paid by the Mortgagor to
the Due Date in the month in which the Purchase Price is to be distributed to
Certificateholders, net of any unreimbursed Advances made by the Servicer on the
Mortgage Loan, and

      (iii) any costs and damages incurred by the Trust Fund in connection with
any violation by the Mortgage Loan of any predatory or abusive lending law.

      If the Mortgage Loan is purchased pursuant to Section 3.12, the interest
component of the Purchase Price shall be computed (i) on the basis of the
applicable Adjusted Mortgage Rate before giving effect to the related
modification and (ii) from the date to which interest was last paid to the date
on which the Mortgage Loan is assigned to the Servicer pursuant to Section 3.12.

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

      Rating Agency: Each of the Rating Agencies specified in the Preliminary
Statement. If any of them or a successor is no longer in existence, "Rating
Agency" shall be the nationally recognized

                                       29
<PAGE>

statistical rating organization, or other comparable Person, designated by the
Depositor and identified as a "Rating Agency" in the Underwriters' Exemption,
notice of which designation shall be given to the Trustee. References to a given
rating or rating category of a Rating Agency means the rating category without
giving effect to any modifiers.

      Realized Loss: With respect to each Liquidated Mortgage Loan, an amount
(not less than zero or more than the Stated Principal Balance of the Mortgage
Loan) as of the date of such liquidation, equal to (i) the Stated Principal
Balance of the Liquidated Mortgage Loan as of the date of such liquidation, plus
(ii) interest at the Adjusted Net Mortgage Rate from the Due Date as to which
interest was last paid or advanced (and not reimbursed) to Certificateholders up
to the Due Date in the month in which Liquidation Proceeds are required to be
distributed on the Stated Principal Balance of such Liquidated Mortgage Loan
from time to time, minus (iii) the Liquidation Proceeds, if any, received during
the month in which such liquidation occurred, to the extent applied as
recoveries of interest at the Adjusted Net Mortgage Rate and to principal of the
Liquidated Mortgage Loan. With respect to each Mortgage Loan that has become the
subject of a Deficient Valuation, if the principal amount due under the related
Mortgage Note has been reduced, the difference between the principal balance of
the Mortgage Loan outstanding immediately prior to such Deficient Valuation and
the principal balance of the Mortgage Loan as reduced by the Deficient
Valuation. With respect to each Mortgage Loan that has become the subject of a
Debt Service Reduction and any Distribution Date, the amount, if any, by which
the principal portion of the related Scheduled Payment has been reduced.

      To the extent the Servicer receives Subsequent Recoveries with respect to
any Mortgage Loan, the amount of the Realized Loss with respect to that Mortgage
Loan will be reduced by such Subsequent Recoveries.

      Recognition Agreement: For any Cooperative Loan, an agreement between the
Cooperative Corporation and the originator of the Mortgage Loan that establishes
the rights of the originator in the Cooperative Property.

      Record Date: With respect to any Distribution Date and any Definitive
Certificate and the Delay Certificates, the close of business on the last
Business Day of the month preceding the month of that Distribution Date (or in
the case of the first Distribution Date, the Closing Date). With respect to any
Distribution Date and the Non-Delay Certificates as long as they are Book-Entry
Certificates, the Business Day immediately prior to such Distribution Date.

      Reference Bank:   As defined in Section 4.09.

      Refinance Loan:   Any Mortgage Loan the proceeds of which are used to
refinance an Original Mortgage Loan.

      Regular Certificates:   As specified in the Preliminary Statement.

      Regulation AB: Subpart 229.1100 - Asset Backed Securities (Regulation
AB), 17 C.F.R. ss.ss.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,
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.

      Relief Act:   The Servicemembers Civil Relief Act.

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<PAGE>

      Relief Act Reductions: With respect to any Distribution Date and any
Mortgage Loan as to which there has been a reduction in the amount of interest
collectible thereon for the most recently ended calendar month as a result of
the application of the Relief Act or any similar state or local laws, the
amount, if any, by which (i) interest collectible on such Mortgage Loan for the
most recently ended calendar month is less than (ii) interest accrued thereon
for such month pursuant to the Mortgage Note.

      REMIC: A "real estate mortgage investment conduit" within the meaning of
section 860D of the Code.

      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
regulations promulgated thereunder, as the foregoing may be in effect from time
to time as well as provisions of applicable state laws.

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

      Reportable Event: Any event required to be reported on Form 8-K, and in
any event, the following:

      (a) entry into a definitive agreement related to the Trust Fund, the
Certificates or the Mortgage Loans, or an amendment to a Transaction Document,
even if the Depositor is not a party to such agreement (e.g., a servicing
agreement with a servicer contemplated by Item 1108(a)(3) of Regulation AB);

      (b) termination of a Transaction Document (other than by expiration of the
agreement on its stated termination date or as a result of all parties
completing their obligations under such agreement), even if the Depositor is not
a party to such agreement (e.g., a servicing agreement with a servicer
contemplated by Item 1108(a)(3) of Regulation AB);

      (c) with respect to the Servicer only, if the Servicer becomes aware of
any bankruptcy or receivership with respect to the Seller, the Depositor, the
Servicer, the Trustee, the Cap Counterparty, any enhancement or support provider
contemplated by Items 1114(b) or 1115 of Regulation AB, or any other material
party contemplated by Item 1101(d)(1) of Regulation AB;

      (d) with respect to the Trustee, the Servicer and the Depositor only, the
occurrence of an early amortization, performance trigger or other event,
including an Event of Default under this Agreement;

      (e) any amendment to this Agreement;

      (f) the resignation, removal, replacement, substitution of the Servicer or
the Trustee;

      (g) with respect to the Servicer only, if the Servicer becomes aware that
(i) any material enhancement or support specified in Item 1114(a)(1) through (3)
of Regulation AB or Item 1115 of Regulation AB that was previously applicable
regarding one or more Classes of the Certificates has terminated other than by
expiration of the contract on its stated termination date or as a result of all
parties completing their obligations under such agreement; (ii) any material
enhancement specified in Item 1114(a)(1) through (3) of Regulation AB or Item
1115 of Regulation AB has been added with respect to one or more Classes of the
Certificates; or (iii) any existing material enhancement or support specified in

                                       31
<PAGE>

Item 1114(a)(1) through (3) of Regulation AB or Item 1115 of Regulation AB with
respect to one or more Classes of the Certificates has been materially amended
or modified; and

      (h) with respect to the Trustee, the Servicer and the Depositor only, a
required distribution to Holders of the Certificates is not made as of the
required Distribution Date under this Agreement.

       Reporting Subcontractor: With respect to the Servicer or the Trustee, any
Subcontractor determined by such Person pursuant to Section 11.08(b) to be
"participating in the servicing function" within the meaning of Item 1122 of
Regulation AB. References to a Reporting Subcontractor shall refer only to the
Subcontractor of such Person and shall not refer to Subcontractors generally.

      Request for Release: The Request for Release submitted by the Servicer to
the Trustee, substantially in the form of Exhibits M and N, as appropriate.

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

      Residual Certificates:   As specified in the Preliminary Statement.

      Responsible Officer: When used with respect to the Trustee, any Managing
Director, any Director, Vice President, any Assistant Vice President, any
Associate, any Assistant Secretary, any Trust Officer, or any other officer of
the Trustee customarily performing functions similar to those performed by any
of the above designated officers who at such time shall be officers to whom,
with respect to a particular matter, the matter is referred because of the
officer's knowledge of and familiarity with the particular subject and who has
direct responsibility for the administration of this Agreement.

      Restricted Classes:   As defined in Section 4.02(e).

      SAIF:   The Savings Association Insurance Fund, or any successor thereto.

      Sarbanes-Oxley Certification:   As defined in Section 11.05.

      S&P:   Standard & Poor's, a division of The McGraw-Hill Companies, Inc.
If S&P is designated as a Rating Agency in the Preliminary Statement, for
purposes of Section 10.05(b) the address for notices to S&P shall be Standard
& Poor's, a division of The McGraw-Hill Companies, Inc., 55 Water Street, New
York, New York 10041, Attention: Mortgage Surveillance Monitoring, or any
other address that S&P furnishes to the Depositor and the Servicer.

      Scheduled Balance:   Not applicable.

      Scheduled Classes:   As specified in the Preliminary Statement.

      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 which,
unless otherwise specified herein, shall give effect to any related Debt Service
Reduction and any Deficient Valuation that affects the amount of the monthly
payment due on such Mortgage Loan.

      Scheduled Principal Distribution Amount: For any Distribution Date, an
amount equal to the related Senior Percentage of all amounts described in
clauses (a) through (d) of the definition of Principal Amount for Collateral
Allocation Group 1 for such Distribution Date; provided, however, that if a
Bankruptcy Loss that is an Excess Loss is sustained with respect to a Mortgage
Loan that is not a

                                       32
<PAGE>

Liquidated Mortgage Loan, the Scheduled Principal Distribution Amount will be
reduced on the related Distribution Date by the related Applicable Fraction of
the principal portion of such Bankruptcy Loss.

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

      Security Agreement: For any Cooperative Loan, the agreement between the
owner of the related Co-op Shares and the originator of the related Mortgage
Note that defines the security interest in the Co-op Shares and the related
Proprietary Lease.

      Seller:   IndyMac Bank, F.S.B., a federal savings bank, and its
successors and assigns, in its capacity as seller of the Mortgage Loans to
the Depositor.

      Senior Certificate Group:   As specified in the Preliminary Statement.

      Senior Certificates:   As specified in the Preliminary Statement.

      Senior Credit Support Depletion Date: The date on which the Class
Certificate Balance of each Class of Subordinated Certificates has been reduced
to zero.

      Senior Percentage: As to any Collateral Allocation Group (other than
Collateral Allocation Group PO) and Distribution Date, the percentage equivalent
of a fraction the numerator of which is the aggregate Class Certificate Balance
of the Senior Certificates (other than the Notional Amount Certificates) related
to that Collateral Allocation Group immediately before the Distribution Date and
the denominator of which is the sum of the Applicable Fraction of the Stated
Principal Balance of each Mortgage Loan as of the Due Date occurring in the
month prior to the month of that Distribution Date (after giving effect to
Principal Prepayments received in the Prepayment Period related to such prior
Due Date); provided, however, that on any Distribution Date after a Senior
Termination Date, the Senior Percentage for the Senior Certificates of the
remaining Senior Certificate Group is the percentage equivalent of a fraction,
the numerator of which is the aggregate Class Certificate Balance of the Senior
Certificates (other than the Class PO Certificates and the Notional Amount
Certificates) of such remaining Senior Certificate Group immediately prior to
such Distribution Date and the denominator of which is the aggregate Class
Certificate Balance of all Classes of Certificates (other than the Class PO
Certificates), immediately prior to such Distribution Date.

      Senior Prepayment Percentage: As to any Collateral Allocation Group (other
than Collateral Allocation Group PO) and Distribution Date during the five years
beginning on the first Distribution Date, 100%. The Senior Prepayment Percentage
for any Distribution Date occurring on or after the fifth anniversary of the
first Distribution Date will, except as provided in this Agreement, be as
follows: for any Distribution Date in the first year thereafter, the related
Senior Percentage plus 70% of the related Subordinated Percentage for such
Distribution Date; for any Distribution Date in the second year thereafter, the
related Senior Percentage plus 60% of the related Subordinated Percentage for
such Distribution Date; for any Distribution Date in the third year thereafter,
the related Senior Percentage plus 40% of the related Subordinated Percentage
for such Distribution Date; for any Distribution Date in the fourth year
thereafter, the related Senior Percentage plus 20% of the related Subordinated
Percentage for such Distribution Date; and for any Distribution Date thereafter,
the related Senior Percentage for such Distribution Date (unless on any
Distribution Date the Senior Percentage of a Senior Certificate Group exceeds
the initial Senior Percentage for such Certificate Group, in which case the
Senior Prepayment Percentage for each Senior Certificate Group and such
Distribution Date will once again equal 100%). Notwithstanding the foregoing, no
decrease in the Senior Prepayment Percentage will occur unless both Senior Step
Down Conditions are satisfied with respect to both Loan Groups.

                                       33
<PAGE>

      Senior Principal Distribution Amount: As to any Distribution Date and
Collateral Allocation Group (other than Collateral Allocation Group PO), the sum
of (i) the related Senior Percentage of all amounts described in clauses (a)
through (d) of the definition of Principal Amount for that Collateral Allocation
Group for that Distribution Date, (ii) with respect to any Mortgage Loan in that
Collateral Allocation Group that became a Liquidated Mortgage Loan during the
calendar month preceding the month of such Distribution Date, the lesser of (x)
the related Senior Percentage of the related Applicable Fraction of the Stated
Principal Balance of such Mortgage Loan and (y) either (A) if no Excess Losses
were sustained on the Liquidated Mortgage Loan during the preceding calendar
month, the related Senior Prepayment Percentage of the related Applicable
Fraction of the amount of the Liquidation Proceeds allocable to principal
received on the Mortgage Loan or (B) if an Excess Loss were sustained with
respect to such Liquidated Mortgage Loan during such preceding calendar month,
the Senior Percentage of the amount of the Liquidation Proceeds allocable to
principal received with respect to such Mortgage Loan, and (iii) the sum of (x)
the Senior Prepayment Percentage of the amounts described in clauses (f) and (g)
of the definition of Principal Amount for that Collateral Allocation Group for
that Distribution Date; provided, however, that if a Bankruptcy Loss that is an
Excess Loss is sustained with respect to a Mortgage Loan that is not a
Liquidated Mortgage Loan, the Senior Principal Distribution Amount for that
Collateral Allocation Group will be reduced on the related Distribution Date by
the Senior Percentage of the related Applicable Fraction of the applicable
principal portion of such Bankruptcy Loss; provided further, however, on any
Distribution Date after a Senior Termination Date, the Senior Principal
Distribution Amount for the remaining Senior Certificate Group will be
calculated pursuant to the above formula based on all the Mortgage Loans, as
opposed to the Mortgage Loans in the applicable Collateral Allocation Group. As
to any Distribution Date and Collateral Allocation Group PO, the Principal
Amount for Collateral Allocation Group PO.

      Senior Step Down Conditions: With respect to a Collateral Allocation Group
(other than Collateral Allocation Group PO): (i) the related Applicable Fraction
of the Stated Principal Balance of each Mortgage Loan in that Collateral
Allocation Group delinquent 60 days or more (including Mortgage Loans in
foreclosure proceedings, REO Property and Mortgage Loans the mortgagors of which
are in bankruptcy) (averaged over the preceding six month period), as a
percentage of (a) if such date is on or prior to a Senior Termination Date, the
Subordinated Percentage for that Collateral Allocation Group of the related
Applicable Fraction of the Stated Principal Balance of each Mortgage Loan or (b)
if such date is after a Senior Termination Date, the aggregate Class Certificate
Balance of the Subordinated Certificates, does not equal or exceed 50%, and (ii)
cumulative Realized Losses on the related Applicable Fraction of each Mortgage
Loan for a Collateral Allocation Group do not exceed: (a) commencing with the
Distribution Date on the fifth anniversary of the first Distribution Date, 30%
of the Original Subordinated Principal Balance, (b) commencing with the
Distribution Date on the sixth anniversary of the first Distribution Date, 35%
of the Original Subordinated Principal Balance, (c) commencing with the
Distribution Date on the seventh anniversary of the first Distribution Date, 40%
of the Original Subordinated Principal Balance, (d) commencing with the
Distribution Date on the eighth anniversary of the first Distribution Date, 45%
of the Original Subordinated Principal Balance, and (e) commencing with the
Distribution Date on the ninth anniversary of the first Distribution Date, 50%
of the Original Subordinated Principal Balance.

      Senior Termination Date: For each Senior Certificate Group, the
Distribution Date on which the aggregate Class Certificate Balance of the
related Classes of Senior Certificates has been reduced to zero.

      Servicer:   IndyMac Bank, F.S.B., a federal savings bank, and its
successors and assigns, in its capacity as Servicer under this Agreement.

      Servicer Advance Date:   As to any Distribution Date, 12:30 P.M.
Pacific time on the Business Day preceding the Distribution Date.

                                       34
<PAGE>

      Servicing Advances:   All customary, reasonable, and necessary "out of
pocket" costs and expenses incurred in the performance by the Servicer of its
servicing obligations, including the cost of

            (a) the preservation, restoration, and protection of a Mortgaged
      Property,

            (b) expenses reimbursable to the Servicer pursuant to Section 3.12
      and any enforcement or judicial proceedings, including foreclosures,

             (c) the maintenance and liquidation of any REO Property,

            (d) compliance with the obligations under Section 3.10; and

            (e) reasonable compensation to the Servicer or its affiliates for
      acting as broker in connection with the sale of foreclosed Mortgaged
      Properties and for performing certain default management and other similar
      services (including appraisal services) in connection with the servicing
      of defaulted Mortgage Loans. For purposes of this clause (e), only costs
      and expenses incurred in connection with the performance of activities
      generally considered to be outside the scope of customary servicing duties
      shall be treated as Servicing Advances.

      Servicing Criteria:   The "servicing criteria" set forth in Item 1122(d)
of Regulation AB.

      Servicing Fee: As to each Mortgage Loan and any Distribution Date, one
month's interest at the applicable Servicing Fee Rate on the Stated Principal
Balance of the Mortgage Loan as of the Due Date in the month preceding the month
of such Distribution Date (after giving effect to Principal Prepayments in the
Prepayment Period related to that prior Due Date), or, whenever a payment of
interest accompanies a Principal Prepayment in Full made by the Mortgagor,
interest at the Servicing Fee Rate on the Stated Principal Balance of the
Mortgage Loan for the period covered by the payment of interest, subject to
reduction as provided in Section 3.15.

      Servicing Fee Rate: For each Mortgage Loan, the per annum rate specified
on the Mortgage Loan Schedule.

      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 the
list may from time to time be amended.

      Servicing Standard: That degree of skill and care exercised by the
Servicer with respect to mortgage loans comparable to the Mortgage Loans
serviced by the Servicer for itself or others.

      Shift Percentage: For any Distribution Date occurring during the five
years beginning on the first Distribution Date, 0%. For any Distribution Date
occurring on or after the fifth anniversary of the first Distribution Date as
follows: for any Distribution Date in the first year thereafter, 30%; for any
Distribution Date in the second year thereafter, 40%; for any Distribution Date
in the third year thereafter, 60%; for any Distribution Date in the fourth year
thereafter, 80%; and for any Distribution Date thereafter, 100%.

      Special Hazard Coverage Termination Date: The point in time at which the
Special Hazard Loss Coverage Amount is reduced to zero.

      Special Hazard Loss: Any Realized Loss suffered by a Mortgaged Property on
account of direct physical loss, but not including (i) any loss of a type
covered by a hazard insurance policy or a flood

                                       35
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insurance policy required to be maintained with respect to such Mortgaged
Property pursuant to Section 3.10 to the extent of the amount of such loss
covered thereby, or (ii) any loss caused by or resulting from:

            (a) normal wear and tear;

            (b) fraud, conversion or other dishonest act on the part of the
      Trustee, the Servicer or any of their agents or employees (without regard
      to any portion of the loss not covered by any errors and omissions
      policy);

             (c) errors in design, faulty workmanship or faulty materials, unless
      the collapse of the property or a part thereof ensues and then only for
      the ensuing loss;

            (d) nuclear or chemical reaction or nuclear radiation or radioactive
       or chemical contamination, all whether controlled or uncontrolled, and
      whether such loss be direct or indirect, proximate or remote or be in
      whole or in part caused by, contributed to or aggravated by a peril
      covered by the definition of the term "Special Hazard Loss";

            (e) hostile or warlike action in time of peace and war, including
      action in hindering, combating or defending against an actual, impending
      or expected attack:

                  1. by any government or sovereign power, de jure or de facto,
            or by any authority maintaining or using military, naval or air
            forces; or

                  2. by military, naval or air forces; or

                  3. by an agent of any such government, power, authority or
            forces;

            (f) any weapon of war employing nuclear fission, fusion or other
      radioactive force, whether in time of peace or war; or

            (g) insurrection, rebellion, revolution, civil war, usurped power or
      action taken by governmental authority in hindering, combating or
      defending against such an occurrence, seizure or destruction under
      quarantine or customs regulations, confiscation by order of any government
      or public authority, or risks of contraband or illegal transportation or
      trade.

      Special Hazard Loss Coverage Amount: With respect to the first
Distribution Date, $3,713,881. With respect to any Distribution Date after the
first Distribution Date, the lesser of (a) the greatest of (i) 1% of the
aggregate of the principal balances of the Mortgage Loans, (ii) twice the
principal balance of the largest Mortgage Loan and (iii) the aggregate of the
principal balances of all Mortgage Loans secured by Mortgaged Properties located
in the single California postal zip code area having the highest aggregate
principal balance of any such zip code area and (b) the Special Hazard Loss
Coverage Amount as of the Closing Date less the amount, if any, of Special
Hazard Losses allocated to the Certificates since the Closing Date. All
principal balances for the purpose of this definition will be calculated as of
the first day of the calendar month preceding the month of such Distribution
Date after giving effect to Scheduled Payments on the Mortgage Loans then due,
whether or not paid.

      Special Hazard Mortgage Loan: A Liquidated Mortgage Loan as to which a
Special Hazard Loss has occurred.

      Startup Day:   The Closing Date.

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      Stated Principal Balance: As to any Mortgage Loan and Due Date, the unpaid
principal balance of such Mortgage Loan as of such Due Date, as specified in the
amortization schedule at the time relating thereto (before any adjustment to
such amortization schedule by reason of any moratorium or similar waiver or
grace period) after giving effect to the sum of: (i) the payment of principal
due on such Due Date and irrespective of any delinquency in payment by the
related Mortgagor and (ii) any Liquidation Proceeds allocable to principal
received in the prior calendar month and Principal Prepayments received through
the last day of the Prepayment Period in which the Due Date occurs, in each case
with respect to such Mortgage Loan.

      Subcontractor: Any vendor, subcontractor or other Person that is not
responsible for the overall servicing (as "servicing" is commonly understood by
participants in the mortgage-backed securities market) of Mortgage Loans but
performs one or more discrete functions identified in Item 1122(d) of Regulation
AB with respect to the Mortgage Loans under the direction or authority of the
Servicer or the Trustee, as the case may be.

      Subordinated Certificates:   As specified in the Preliminary Statement.

      Subordinated Percentage: As to any Collateral Allocation Group (other than
Collateral Allocation Group PO) and Distribution Date on or prior to a Senior
Termination Date, 100% minus the Senior Percentage for the Senior Certificate
Group relating to such Collateral Allocation Group for such Distribution Date.
As to any Distribution Date after a Senior Termination Date, 100% minus the
Senior Percentage for such Distribution Date.

      Subordinated Prepayment Percentage: As to any Distribution Date and
Collateral Allocation Group (other than the Collateral Allocation Group PO),
100% minus the Senior Prepayment Percentage for such Distribution Date.

      Subordinated Principal Distribution Amount: As to any Distribution Date
and Collateral Allocation Group (other than Collateral Allocation Group PO), the
sum of: (i) the related Subordinated Percentage of all amounts described in
subclauses (a) through (d) of clause (i) of the definition of Principal Amount
for that Collateral Allocation Group with respect to such Distribution Date,
(ii) with respect to any Mortgage Loan that became a Liquidated Mortgage Loan
during the calendar month preceding the month of such Distribution Date, the
amount of Liquidation Proceeds allocable to principal received with respect
thereto remaining after application thereof pursuant to clause (ii) of the
definition of Senior Principal Distribution Amount for that Collateral
Allocation Group, up to the Subordinated Percentage of the related Applicable
Fraction of the Stated Principal Balance of the Mortgage Loans, as of the Due
Date in the month preceding the month of that Distribution Date, (iii) the
Subordinated Prepayment Percentage of the amounts described in subclauses (f)
and (g) of clause of the definition of Principal Amount for that Collateral
Allocation Group for such Distribution Date, and (iv) the Subordinated
Prepayment Percentage of any Subsequent Recoveries described in clause (ii) of
the definition of Principal Amount and that Distribution Date, reduced by the
amount of any payments in respect of Class PO Deferred Amounts on the
Distribution Date; provided, however, that on any Distribution Date after the
Senior Termination Date, the Subordinated Principal Distribution Amount will not
be calculated by Collateral Allocation Group but will equal the amount
calculated pursuant to the applicable formula set forth above based on the
applicable Subordinated Percentage and Subordinated Prepayment Percentage for
the Subordinated Certificates for such Distribution Date with respect to all of
the Mortgage Loans as opposed to the Mortgage Loans only in the related
Collateral Allocation Group.

      Subsequent Recoveries: As to any Distribution Date, with respect to a
Liquidated Mortgage Loan that resulted in a Realized Loss in a prior calendar
month, unexpected amounts received by the

                                       37
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Servicer (net of any related expenses permitted to be reimbursed pursuant to
Section 3.09) specifically related to such Liquidated Mortgage Loan.

      Substitute Mortgage Loan: A Mortgage Loan substituted by the Seller for a
Deleted Mortgage Loan that must, on the date of substitution, as confirmed in a
Request for Release, substantially in the form of Exhibit M,

      (i) 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 more than 10% less than, the Stated Principal Balance of the Deleted
Mortgage Loan (unless the amount of any shortfall is deposited by the Seller in
the Certificate Account and held for distribution to the Certificateholders on
the related Distribution Date);

      (ii) have a Mortgage Rate no lower than and not more than 1% per annum
higher than the Deleted Mortgage Loan;

      (iii) have a Loan-to-Value Ratio no higher than that of the Deleted
Mortgage Loan;

      (iv) have a remaining term to maturity not more than one year greater than
(and not more than one year less than) that of the Deleted Mortgage Loan,
provided that Substitute Mortgage Loan with a remaining term to maturity greater
than that of the Deleted Mortgage Loan may not exceed 5% of the Cut-off Date
Pool Principal Balance;

      (v) not be a Cooperative Loan unless the Deleted Mortgage Loan was a
Cooperative Loan; and

       (vi) comply with each representation and warranty in Section 2.03.

      Substitution Adjustment Amount:   As defined in Section 2.03.

      Suspension Notification:   Notification to the Commission of the
suspension of the Trust Fund's obligation to file reports pursuant to Section
15(d) of the Exchange Act.

      Targeted Balance:   Not applicable.

      Targeted Principal Classes:   As specified in the Preliminary Statement.

      Transaction Documents:   This Agreement and any other document or
agreement entered into in connection with the Trust Fund, the Certificates or
the Mortgage Loans.

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

      Transfer Payment Made:   As defined in Section 4.03.

      Transfer Payment Received:   As defined in Section 4.03.

      Trust Fund:   The corpus of the trust created under this Agreement
consisting of

      (i) the Mortgage Loans and all interest and principal received on them
after the Cut-off Date, other than amounts due on the Mortgage Loans by the
Cut-off Date;

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<PAGE>

      (ii) the Certificate Account, the Distribution Account and all amounts
deposited therein pursuant to this Agreement (including amounts received from
the Seller on the Closing Date that will be deposited by the Trustee in the
Certificate Account pursuant to Section 2.01);

      (iii) property that secured a Mortgage Loan and has been acquired by
foreclosure, deed-in-lieu of foreclosure, or otherwise;

      (iv) the right to collect any amounts under any mortgage insurance
policies covering any Mortgage Loan and any collections received under any
mortgage insurance policies covering any Mortgage Loan; and

      (v) all proceeds of the conversion, voluntary or involuntary, of any of
the foregoing.

      Trustee: Deutsche Bank National Trust Company and its successors and, if a
successor trustee is appointed under this Agreement, the successor.

      Trustee Fee: The fee payable to the Trustee on each Distribution Date for
its services as Trustee hereunder, in an amount equal to one-twelfth of the
Trustee Fee Rate multiplied by the aggregate Stated Principal Balance of the
Mortgage Loans as of the Due Date in the month preceding the month of such
Distribution Date (after giving effect to Principal Prepayments in the
Prepayment Period related to that prior Due Date).

      Trustee Fee Rate:   0.0000% per annum.

      The terms "United States," "State," and "International Organization" have
the meanings in section 7701 of the Code or successor provisions. A corporation
will not be treated as an instrumentality of the United States or of any State
or political subdivision 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.

      UCC:   The Uniform Commercial Code for the State of New York.

      Undercollateralized Group:   As defined in Section 4.03.

      Underwriter's Exemption:   Prohibited Transaction Exemption 2002-41, 67
Fed.   Reg.   54487 (2002) (or any successor thereto), or any substantially
similar administrative exemption granted by the U.S. Department of Labor.

       United States Person or U.S. Person:

      (i) A citizen or resident of the United States;

      (ii) a corporation (or entity treated as a corporation for tax purposes)
created or organized in the United States or under the laws of the United States
or of any state thereof, including, for this purpose, the District of Columbia;

      (iii) a partnership (or entity treated as a partnership for tax purposes)
organized in the United States or under the laws of the United States or of any
state thereof, including, for this purpose, the District of Columbia (unless
provided otherwise by future Treasury regulations);

      (iv) an estate whose income is includible in gross income for United
States income tax purposes regardless of its source; or

                                        39
<PAGE>

      (v) a trust, if a court within the United States is able to exercise
primary supervision over the administration of the trust and one or more U.S.
Persons have authority to control all substantial decisions of the trust.
Notwithstanding the last clause of the preceding sentence, to the extent
provided in Treasury regulations, certain trusts in existence on August 20,
1996, and treated as U.S. Persons before that date, may elect to continue to be
U.S. Persons.

      Unscheduled Principal Distribution Amount: For any Distribution Date and
Collateral Allocation Group 1, the sum of the amounts described in clauses (e)
through (g) of the definition of Principal Amount for Collateral Allocation
Group 1 for that Distribution Date.

      U.S.A. Patriot Act: The Uniting and Strengthening America by Providing
Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001.

      Voting Rights: The portion of the voting rights of all of the Certificates
that is allocated to any Certificate. As of any date of determination, (a) 1% of
all Voting Rights shall be allocated to each Class of Notional Amount
Certificates (the Voting Rights to be allocated among the holders of
Certificates of each Class in accordance with their respective Percentage
Interests), (b) 1% of all Voting Rights shall be allocated to the Holder of the
Class A-R Certificates and (c) the remaining Voting Rights shall be allocated
among Holders of the remaining Classes of Offered Certificates in proportion to
the Certificate Balances of the respective Certificates on the date.

      Weighted Average Rate: For the Interest Accrual Period for each
Distribution Date a per annum rate equal to the sum of (i) 5.75% multiplied by
the excess of the sum of the related Applicable Fraction for Collateral
Allocation Group 1 of the aggregate Stated Principal Balance of each Mortgage
Loan included in Collateral Allocation Group 1 as of the Due Date in the month
preceding the month of that Distribution Date (after giving effect to Principal
Prepayments received in the Prepayment Period related to that Due Date) over the
aggregate Class Certificate Balance of the Group 1 Senior Certificates
immediately prior to that Distribution Date and (ii) 7.00% multiplied by the
excess of the sum of the related Applicable Fraction for Collateral Allocation
Group 2 of the aggregate Stated Principal Balance of each Mortgage Loan included
in Collateral Allocation Group 2 as of the Due Date in the month preceding the
month of that Distribution Date (after giving effect to Principal Prepayments
received in the Prepayment Period related to that Due Date) over the aggregate
Class Certificate Balance of the Group 2 Senior Certificates immediately prior
to that Distribution Date and divided by the aggregate Class Certificate Balance
of the Subordinated Certificates immediately prior to that Distribution Date.

      Withdrawal Date: The 18th day of each month, or if such day is not a
Business Day, the next preceding Business Day.

      Section 1.02 Rules of Construction.

      Except as otherwise expressly provided in this Agreement or unless the
context clearly requires otherwise

         (a) References to designated articles, sections, subsections, exhibits,
   and other subdivisions of this Agreement, such as "Section 6.12 (a)," refer
   to the designated article, section, subsection, exhibit, or other subdivision
   of this Agreement as a whole and to all subdivisions of the designated
   article, section, subsection, exhibit, or other subdivision. The words
   "herein," "hereof," "hereto," "hereunder," and other words of similar import
   refer to this Agreement as a whole and not to any particular article,
   section, exhibit, or other subdivision of this Agreement.

                                        40
<PAGE>

         (b) Any term that relates to a document or a statute, rule, or
   regulation includes any amendments, modifications, supplements, or any other
   changes that may have occurred since the document, statute, rule, or
   regulation came into being, including changes that occur after the date of
   this Agreement.

         (c) Any party may execute any of the requirements under this Agreement
   either directly or through others, and the right to cause something to be
   done rather than doing it directly shall be implicit in every requirement
   under this Agreement. Unless a provision is restricted as to time or limited
   as to frequency, all provisions under this Agreement are implicitly available
   and things may happen from time to time.

         (d) The term "including" and all its variations mean "including but not
   limited to." Except when used in conjunction with the word "either," the word
   "or" is always used inclusively (for example, the phrase "A or B" means "A or
   B or both," not "either A or B but not both").

         (e) A reference to "a [thing]" or "any [of a thing]" does not imply the
   existence or occurrence of the thing referred to even though not followed by
   "if any," and "any [of a thing]" is any of it. A reference to the plural of
   anything as to which there could be either one or more than one does not
   imply the existence of more than one (for instance, the phrase "the obligors
   on a note" means "the obligor or obligors on a note"). "Until [something
   occurs]" does not imply that it must occur, and will not be modified by the
   word "unless." The word "due" and the word "payable" are each used in the
   sense that the stated time for payment has passed. The word "accrued" is used
   in its accounting sense, i.e., an amount paid is no longer accrued. In the
   calculation of amounts of things, differences and sums may generally result
   in negative numbers, but when the calculation of the excess of one thing over
   another results in zero or a negative number, the calculation is disregarded
   and an "excess" does not exist. Portions of things may be expressed as
   fractions or percentages interchangeably.

         (f) All accounting terms used in an accounting context and not
   otherwise defined, and accounting terms partly defined in this Agreement, to
   the extent not completely defined, shall be construed in accordance with
   generally accepted accounting principles. To the extent that the definitions
   of accounting terms in this Agreement are inconsistent with their meanings
   under generally accepted accounting principles, the definitions contained in
   this Agreement shall control. Capitalized terms used in this Agreement
   without definition that are defined in the Uniform Commercial Code are used
   in this Agreement as defined in the Uniform Commercial Code.

         (g) In the computation of a period of time from a specified date to a
   later specified date or an open-ended period, the words "from" and
   "beginning" mean "from and including," the word "after" means "from but
   excluding," the words "to" and "until" mean "to but excluding," and the word
   "through" means "to and including." Likewise, in setting deadlines or other
   periods, "by" means "by." The words "preceding," "following," and words of
   similar import, mean immediately preceding or following. References to a
   month or a year refer to calendar months and calendar years.

         (h) Any reference to the enforceability of any agreement against a
   party means that it is enforceable, subject as to enforcement against the
   party, to applicable bankruptcy, insolvency, reorganization, and other
   similar laws of general applicability relating to or affecting creditors'
   rights and to general equity principles.

                                       41
<PAGE>

                                  ARTICLE TWO

          CONVEYANCE OF MORTGAGE LOANS; REPRESENTATIONS AND WARRANTIES

      Section 2.01 Conveyance of Mortgage Loans.

          (a) The Seller, concurrently with the execution and delivery of this
   Agreement, hereby transfers to the Depositor, without recourse, all the
   interest of the Seller in each Mortgage Loan, including all interest and
   principal received or receivable by the Seller on each Mortgage Loan after
   the Cut-off Date and all interest and principal payments on each Mortgage
   Loan received before the Cut-off Date for installments of interest and
   principal due after the Cut-off Date but not including payments of principal
   and interest due by the Cut-off Date. By the Closing Date, the Seller shall
   deliver to the Depositor or, at the Depositor's direction, to the Trustee or
   other designee of the Depositor, the Mortgage File for each Mortgage Loan
   listed in the Mortgage Loan Schedule (except that, in the case of Mortgage
   Loans that are Delay Delivery Mortgage Loans, such delivery may take place
   within five Business Days of the Closing Date) as of the Closing Date. The
   delivery of the Mortgage Files shall be made against payment by the Depositor
   of the purchase price, previously agreed to by the Seller and Depositor, for
   the Mortgage Loans. With respect to any Mortgage Loan that does not have a
   first payment date on or before the Due Date in the month of the first
   Distribution Date, the Seller shall deposit into the Distribution Account on
   the first Distribution Account Deposit Date an amount equal to one month's
   interest at the related Adjusted Mortgage Rate on the Cut-off Date Principal
   Balance of such Mortgage Loan.

         (b) The Depositor, concurrently with the execution and delivery of this
   Agreement, hereby transfers to the Trustee for the benefit of the
   Certificateholders, without recourse, all the interest of the Depositor in
   the Trust Fund, together with the Depositor's right to require the Seller to
   cure any breach of a representation or warranty made in this Agreement by the
   Seller or to repurchase or substitute for any affected Mortgage Loan in
   accordance with this Agreement.

         (c) In connection with the transfer and assignment of each Mortgage
   Loan, the Depositor has delivered (or, in the case of the Delay Delivery
   Mortgage Loans, will deliver to the Trustee within the time periods specified
   in the definition of Delay Delivery Mortgage Loans), for the benefit of the
   Certificateholders the following documents or instruments with respect to
   each Mortgage Loan so assigned:

            (i) The original Mortgage Note, endorsed by manual or facsimile
      signature in blank in the following form: "Pay to the order of
      _______________ ______________without recourse," with all intervening
      endorsements showing a complete chain of endorsement from the originator
      to the Person endorsing the Mortgage Note (each endorsement being
      sufficient to transfer all interest of the party so endorsing, as
      noteholder or assignee thereof, in that Mortgage Note) or a lost note
      affidavit for any Lost Mortgage Note from the Seller stating that the
      original Mortgage Note was lost or destroyed, together with a copy of the
      Mortgage Note;

            (ii) Except as provided below and for each Mortgage Loan that is not
      a MERS Mortgage Loan, the original recorded Mortgage or a copy of such
      Mortgage certified by the Seller as being a true and complete copy of the
      Mortgage (or, in the case of a Mortgage for which the related Mortgaged
      Property is located in the Commonwealth of Puerto Rico, a true copy of the
      Mortgage certified as such by the applicable notary) and in the case of
      each MERS Mortgage Loan, the original Mortgage, noting the presence of the
      MIN of the Mortgage Loan and either language indicating that the Mortgage
      Loan is a MOM Loan if the Mortgage Loan is a MOM Loan or if the Mortgage
      Loan was not a MOM Loan at origination, the original Mortgage and the

                                       42
<PAGE>

      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;

            (iii) In the case of a Mortgage Loan that is not a MERS Mortgage
      Loan, a duly executed assignment of the Mortgage (which may be included in
      a blanket assignment or assignments), together with, except as provided
      below, all interim recorded assignments of the mortgage (each assignment,
      when duly and validly completed, to be in recordable form and sufficient
      to effect the assignment of and transfer to its assignee of the Mortgage
      to which the assignment relates). If the related Mortgage has not been
      returned from the applicable public recording office, the assignment of
      the Mortgage may exclude the information to be provided by the recording
      office. The assignment of Mortgage need not be delivered in the case of a
      Mortgage for which the related Mortgage Property is located in the
      Commonwealth of Puerto Rico;

            (iv) The original or copies of each assumption, modification,
      written assurance, or substitution agreement;

            (v) Except as provided below, the original or duplicate original
      lender's title policy and all its riders;

            (vi) The originals of the following documents for each Cooperative
      Loan:

                  (A)    the Co-op Shares, together with a stock power in blank;

                  (B)    the executed Security Agreement;

                  (C)    the executed Proprietary Lease;

                  (D)    the executed Recognition Agreement;

                  (E)    the executed UCC-1 financing statement that has been
                        filed in all places required to perfect the Seller's
                        interest in the Co-op Shares and the Proprietary Lease
                        with evidence of recording on it; and

                  (F)    executed UCC-3 financing statements or other appropriate
                         UCC financing statements required by state law,
                        evidencing a complete and unbroken line from the
                        mortgagee to the Trustee with evidence of recording
                        thereon (or in a form suitable for recordation).

            In addition, in connection with the assignment of any MERS Mortgage
Loan, the Seller agrees that it will cause, at the Seller's expense, the MERS(R)
System to indicate that the Mortgage Loans sold by the Seller to the Depositor
have been assigned by the Seller to the Trustee in accordance with this
Agreement for the benefit of the Certificateholders by including (or deleting,
in the case of Mortgage Loans that are repurchased in accordance with this
Agreement) in such computer files the information required by the MERS(R) System
to identify the series of the Certificates issued in connection with such
Mortgage Loans. The Seller further agrees that it will not, and will not permit
the Servicer to, and the Servicer agrees that it will not, alter the information
referenced in this paragraph with respect to any Mortgage Loan sold by the
Seller to the Depositor during the term of this Agreement unless and until such
Mortgage Loan is repurchased in accordance with the terms of this Agreement.

                                       43
<PAGE>

      In the event that in connection with any Mortgage Loan that is not a MERS
Mortgage Loan the Depositor cannot deliver (a) the original recorded Mortgage,
(b) all interim recorded assignments or (c) the lender's title policy (together
with all riders thereto) satisfying the requirements of clause (ii), (iii) or
(v) above, respectively, concurrently with the execution and delivery of this
Agreement because such document or documents have not been returned from the
applicable public recording office in the case of clause (ii) or (iii) above, or
because the title policy has not been delivered to either the Servicer or the
Depositor by the applicable title insurer in the case of clause (v) above, then
the Depositor shall promptly deliver to the Trustee, in the case of clause (ii)
or (iii) above, the original Mortgage or the interim assignment, as the case may
be, with evidence of recording indicated on when it is received from the public
recording office, or a copy of it, certified, if appropriate, by the relevant
recording office and in the case of clause (v) above, the original or a copy of
a written commitment or interim binder or preliminary report of title issued by
the title insurance or escrow company, with the original or duplicate copy
thereof to be delivered to the Trustee upon receipt thereof. The delivery of the
original Mortgage Loan and each interim assignment or a copy of them, certified,
if appropriate, by the relevant recording office, shall not be made later than
one year following the Closing Date, or, in the case of clause (v) above, later
than 120 days following the Closing Date. If the Depositor is unable to deliver
each Mortgage by that date and each interim assignment because any documents
have not been returned by the appropriate recording office, or, in the case of
each interim assignment, because the related Mortgage has not been returned by
the appropriate recording office, the Depositor shall deliver the documents to
the Trustee as promptly as possible upon their receipt and, in any event, within
720 days following the Closing Date.

      The Depositor shall forward to the Trustee (a) from time to time
additional original documents evidencing an assumption or modification of a
Mortgage Loan and (b) any other documents required to be delivered by the
Depositor or the Servicer to the Trustee. If the original Mortgage is not
delivered and in connection with the payment in full of the related Mortgage
Loan the public recording office requires the presentation of a "lost
instruments affidavit and indemnity" or any equivalent document, because only a
copy of the Mortgage can be delivered with the instrument of satisfaction or
reconveyance, the Servicer shall execute and deliver the required document to
the public recording office. If a public recording office retains the original
recorded Mortgage or if a Mortgage is lost after recordation in a public
recording office, the Seller shall deliver to the Trustee a copy of the Mortgage
certified by the public recording office to be a true and complete copy of the
original recorded Mortgage.

      As promptly as practicable after any transfer of a Mortgage Loan under
this Agreement, and in any event within thirty days after the transfer, the
Trustee shall (i) affix the Trustee's name to each assignment of Mortgage, as
its assignee, and (ii) cause to be delivered for recording in the appropriate
public office for real property records the assignments of the Mortgages to the
Trustee, except that, if the Trustee has not received the information required
to deliver any assignment of a Mortgage for recording, the Trustee shall deliver
it as soon as practicable after receipt of the needed information and in any
event within thirty days.

      If any Mortgage Loans have been prepaid in full as of the Closing Date,
the Depositor, in lieu of delivering the above documents to the Trustee, will
deposit in the Certificate Account the portion of the prepayment that is
required to be deposited in the Certificate Account pursuant to Section 3.06.

      Notwithstanding anything to the contrary in this Agreement, within five
Business Days after the Closing Date, the Seller shall either

            (x) deliver to the Trustee the Mortgage File as required pursuant to
            this Section 2.01 for each Delay Delivery Mortgage Loan or

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            (y) (A) repurchase the Delay Delivery Mortgage Loan or (B)
            substitute the Substitute Mortgage Loan for a Delay Delivery
            Mortgage Loan, which repurchase or substitution shall be
            accomplished in the manner and subject to the conditions in Section
            2.03 (treating each such Delay Delivery Mortgage Loan as a Deleted
            Mortgage Loan for purposes of such Section 2.03);

provided, however, that if the Seller fails to deliver a Mortgage File for any
Delay Delivery Mortgage Loan within the period specified herein, the Seller
shall use its best reasonable efforts to effect a substitution, rather than a
repurchase of, such Deleted Mortgage Loan and provided further that the cure
period provided for in Section 2.02 or in Section 2.03 shall not apply to the
initial delivery of the Mortgage File for such Delay Delivery Mortgage Loan, but
rather the Seller shall have five (5) Business Days to cure such failure to
deliver. At the end of such period, the Trustee shall send a Delay Delivery
Certification for the Delay Delivery Mortgage Loans delivered during such period
in accordance with the provisions of Section 2.02.

         (d) The Seller agrees to treat the transfer of the Mortgage Loans to
   the Depositor as a sale for all tax, accounting, and regulatory purposes.

         (e) The Trust Fund does not intend to acquire or hold any Mortgage Loan
   that would violate the representations made by the Seller set forth in clause
   (28) of Schedule III.

         (f) Notwithstanding the foregoing, however, for administrative
   convenience and facilitation of servicing and to reduce closing costs, the
   assignments of Mortgage shall not be required to be submitted for recording
   (except with respect to any Mortgage Loan located in Maryland) unless such
   failure to record would, as certified to the Trustee in writing by the
   Servicer, result in a withdrawal or a downgrading by any Rating Agency of
   the rating on any Class of Certificates; provided, however, that each
   assignment of Mortgage shall be submitted for recording by the Seller
   (at the direction of the Servicer) in the manner described above, at no
   expense to the Trust Fund or the Trustee, upon the earliest to occur of: (i)
   reasonable direction by the Holders of Certificates entitled to at least 25%
   of the Voting Rights, (ii) [reserved], (iii) the occurrence of a bankruptcy,
   insolvency or foreclosure relating to the Seller, (iv) the occurrence of a
   servicing transfer as described in Section 7.02 hereof and (v) if the Seller
   is not the Servicer and with respect to any one assignment or Mortgage, the
   occurrence of a bankruptcy, insolvency or foreclosure relating to the
   Mortgagor under the related Mortgage. Notwithstanding the foregoing, if the
   Servicer is unable to pay the cost of recording the assignments of Mortgage,
   such expense shall be paid by the Trustee and shall be reimbursable out of
   the Distribution Account.

      Section 2.02 Acceptance by the Trustee of the Mortgage Loans.

      The Trustee acknowledges receipt of the documents identified in the
Initial Certification in the form of Exhibit G-1, and declares that it holds and
will hold such documents and the other documents delivered to it constituting
the Mortgage Files for the Mortgage Loans, and that it holds or will hold such
other assets as are included in the Trust Fund, in trust for the exclusive use
and benefit of all present and future Certificateholders.

      The Trustee acknowledges that it will maintain possession of the related
Mortgage Notes in the State of California, unless otherwise permitted by the
Rating Agencies. The Trustee agrees to execute and deliver on the Closing Date
to the Depositor, the Servicer and the Seller an Initial Certification in the
form of Exhibit G-1. Based on its review and examination, and only as to the
documents identified in such Initial Certification, the Trustee acknowledges
that such documents appear regular on their face and relate to such Mortgage
Loans. The Trustee shall be under no duty or obligation to inspect, review or

                                        45
<PAGE>

examine said documents, instruments, certificates or other papers to determine
that the same are genuine, enforceable or appropriate for the represented
purpose or that they have actually been recorded in the real estate records or
that they are other than what they purport to be on their face.

      By the thirtieth day after the Closing Date (or if that day is not a
Business Day, the succeeding Business Day), the Trustee shall deliver to the
Depositor, the Servicer, and the Seller a Delay Delivery Certification with
respect to the Mortgage Loans substantially in the form of Exhibit G-2, with any
applicable exceptions noted thereon.

      By the ninetieth day after the Closing Date (or if that day is not a
Business Day, the succeeding Business Day), the Trustee shall deliver to the
Depositor, the Servicer and the Seller a Final Certification with respect to the
Mortgage Loans in the form of Exhibit H, with any applicable exceptions noted
thereon.

      If, in the course of its review, the Trustee finds any document
constituting a part of a Mortgage File that does not meet the requirements of
Section 2.01, the Trustee shall list such as an exception in the Final
Certification. The Trustee shall not make any determination as to whether (i)
any endorsement is sufficient to transfer all interest of the party so
endorsing, as noteholder or assignee thereof, in that Mortgage Note or (ii) any
assignment is in recordable form or is sufficient to effect the assignment of
and transfer to the assignee thereof under the mortgage to which the assignment
relates. The Seller shall promptly correct any defect that materially and
adversely affects the interests of the Certificateholders within 90 days from
the date it was so notified of the defect and, if the Seller does not correct
the defect within that period, the Seller shall either (a) substitute for the
related Mortgage Loan a Substitute Mortgage Loan, which substitution shall be
accomplished in the pursuant Section 2.03, or (b) purchase the Mortgage Loan at
its Purchase Price from the Trustee within 90 days from the date the Seller was
notified of the defect in writing.

      If a substitution or purchase of a Mortgage Loan pursuant to this
provision is required because of a delay in delivery of any documents by the
appropriate recording office, or there is a dispute between either the Servicer
or the Seller and the Trustee over the location or status of the recorded
document, then the substitution or purchase shall occur within 720 days from the
Closing Date. In no other case may a substitution or purchase occur more than
540 days from the Closing Date. No substitution is permitted to be made in any
calendar month after the Determination Date for the month.

      The Purchase Price for any Mortgage Loan shall be deposited by the Seller
in the Certificate Account by the Distribution Account Deposit Date for the
Distribution Date in the month following the month of repurchase and, upon
receipt of the deposit and certification with respect thereto in the form of
Exhibit N, the Trustee shall release the related Mortgage File to the Seller and
shall execute and deliver at the Seller's request any instruments of transfer or
assignment prepared by the Seller, in each case without recourse, necessary to
vest in the Seller, or a designee, the Trustee's interest in any Mortgage Loan
released pursuant hereto.

      If pursuant to the foregoing provisions the Seller repurchases a Mortgage
Loan that is a MERS Mortgage Loan, the Servicer shall either (i) cause MERS to
execute and deliver an assignment of the Mortgage in recordable form to transfer
the Mortgage from MERS to the Seller and shall cause such Mortgage to be removed
from registration on the MERS(R) System in accordance with MERS' rules and
regulations or (ii) cause MERS to designate on the MERS(R) System the Seller as
the beneficial holder of such Mortgage Loan.

      The Trustee shall retain possession and custody of each Mortgage File in
accordance with and subject to the terms and conditions set forth herein. The
Servicer shall promptly deliver to the Trustee,

                                       46
<PAGE>

upon the execution or receipt thereof, the originals of any other documents or
instruments constituting the Mortgage File that come into the possession of the
Servicer from time to time.

      The obligation of the Seller to substitute for or to purchase any Mortgage
Loan that does not meet the requirements of Section 2.01 shall constitute the
sole remedy respecting the defect available to the Trustee, the Depositor, and
any Certificateholder against the Seller.

      Section 2.03 Representations, Warranties, and Covenants of the Seller and
the Servicer.

         (a) IndyMac, in its capacities as Seller and Servicer, makes the
   representations and warranties in Schedule II, and by this reference
   incorporated in this Agreement, to the Depositor and the Trustee, as of the
   Closing Date.

         (b) The Seller, in its capacity as Seller, makes the representations
   and warranties in Schedule III, and by this reference incorporated in this
   Agreement, to the Depositor and the Trustee, as of the Closing Date, or if so
   specified in Schedule III, as of the Cut-off Date.

         (c) Upon discovery by any of the parties hereto of a breach of a
   representation or warranty made pursuant to Section 2.03(b) that materially
   and adversely affects the interests of the Certificateholders in any Mortgage
   Loan, the party discovering such breach shall give prompt notice thereof to
   the other parties. Any breach of the representations or warranties made
   pursuant to clauses (28) and (33) of Schedule III will be deemed to
   materially and adversely affect the interests of the Certificateholder in the
   related Mortgage Loan. The Seller covenants that within 90 days of the
   earlier of its discovery or its receipt of written notice from any party of a
   breach of any representation or warranty made pursuant to Section 2.03(b)
   which materially and adversely affects the interests of the
   Certificateholders in any Mortgage Loan, it shall cure such breach in all
   material respects, and if such breach is not so cured, shall, (i) if the
   90-day period expires before the second anniversary of the Closing Date,
   remove the Mortgage Loan (a "Deleted Mortgage Loan") from the Trust Fund and
   substitute in its place a Substitute Mortgage Loan, in accordance with this
   Section 2.03; or (ii) repurchase the affected Mortgage Loan or Mortgage Loans
   from the Trustee at the Purchase Price in the manner set forth below. Any
   substitution pursuant to (i) above shall not be effected before the delivery
   to the Trustee of the Opinion of Counsel required by Section 2.05, and a
   Request for Release substantially in the form of Exhibit N, and the Mortgage
   File for any Substitute Mortgage Loan. The Seller shall promptly reimburse
   the Servicer and the Trustee for any expenses reasonably incurred by the
   Servicer or the Trustee in respect of enforcing the remedies for the breach.

      With respect to any Substitute Mortgage Loan or Loans, the Seller shall
deliver to the Trustee for the benefit of the Certificateholders the Mortgage
Note, the Mortgage, the related assignment of the Mortgage, and such other
documents and agreements as are required by Section 2.01, with the Mortgage Note
endorsed and the Mortgage assigned as required by Section 2.01. No substitution
is permitted to be made in any calendar month after the Determination Date for
such month. Scheduled Payments due with respect to Substitute Mortgage Loans in
the month of substitution shall not be part of the Trust Fund and will be
retained by the Seller on the next succeeding Distribution Date. For the month
of substitution, distributions to Certificateholders will include the monthly
payment due on any Deleted Mortgage Loan for such month and thereafter the
Seller shall be entitled to retain all amounts received in respect of such
Deleted Mortgage Loan.

      The Servicer shall amend the Mortgage Loan Schedule for the benefit of the
Certificateholders to reflect the removal of the Deleted Mortgage Loan and the
substitution of the Substitute Mortgage Loans and the Servicer shall deliver the
amended Mortgage Loan Schedule to the Trustee. Upon the substitution, the
Substitute Mortgage Loans shall be subject to this Agreement in all respects,
and the

                                       47
<PAGE>

Seller shall be deemed to have made with respect to the Substitute Mortgage
Loans, as of the date of substitution, the representations and warranties made
pursuant to Section 2.03(b) with respect to the Mortgage Loan. Upon any
substitution and the deposit to the Certificate Account of the amount required
to be deposited therein in connection with the substitution as described in the
following paragraph, the Trustee shall release the Mortgage File held for the
benefit of the Certificateholders relating to the Deleted Mortgage Loan to the
Seller and shall execute and deliver at the Seller's direction such instruments
of transfer or assignment prepared by the Seller, in each case without recourse,
as shall be necessary to vest title in the Seller, or its designee, the
Trustee's interest in any Deleted Mortgage Loan substituted for pursuant to this
Section 2.03.

      For any month in which the Seller substitutes one or more Substitute
Mortgage Loans for one or more Deleted Mortgage Loans, the Servicer will
determine the amount (if any) by which the aggregate principal balance of all
such Substitute Mortgage Loans as of the date of substitution is less than the
aggregate Stated Principal Balance of all such Deleted Mortgage Loans (after
application of the scheduled principal portion of the monthly payments due in
the month of substitution). The amount of such shortage (the "Substitution
Adjustment Amount") plus, if the Seller is not the Servicer, an amount equal to
the aggregate of any unreimbursed Advances and Servicer Advances with respect to
such Deleted Mortgage Loans shall be deposited into the Certificate Account by
the Seller by the Distribution Account Deposit Date for the Distribution Date in
the month succeeding the calendar month during which the related Mortgage Loan
became required to be purchased or replaced hereunder. If the Seller repurchases
a Mortgage Loan, the Purchase Price therefor shall be deposited in the
Certificate Account pursuant to Section 3.06 by the Distribution Account Deposit
Date for the Distribution Date in the month following the month during which the
Seller became obligated hereunder to repurchase or replace the Mortgage Loan and
upon such deposit of the Purchase Price and receipt of a Request for Release in
the form of Exhibit N, the Trustee shall release the related Mortgage File held
for the benefit of the Certificateholders to such Person, and the Trustee shall
execute and deliver at such Person's direction such instruments of transfer or
assignment prepared by such Person, in each case without recourse, as shall be
necessary to transfer title from the Trustee. The obligation under this
Agreement of any Person to cure, repurchase, or replace any Mortgage Loan as to
which a breach has occurred and is continuing shall constitute the sole remedy
against the Person respecting the breach available to Certificateholders, the
Depositor, or the Trustee on their behalf.

      The representations and warranties made pursuant to this Section 2.03
shall survive delivery of the respective Mortgage Files to the Trustee for the
benefit of the Certificateholders and shall not be waived by the Depositor.

      The Seller assigns to the Depositor and the Depositor assigns to the
Trustee all rights the Seller might have under contracts with third parties
relating to early payment defaults on the Mortgage Loans ("EPD Rights") and the
Servicer assumes any related duties as part of its servicing obligations.
Consistent with the Servicing Standard, the Servicer shall attempt to enforce
the EPD Rights. If the Servicer's enforcement of the EPD Rights obligates the
Servicer to sell a Mortgage Loan to a third party, the Servicer shall repurchase
the Mortgage Loan at the Purchase Price and sell the Mortgage Loan to the third
party, provided however, in no case shall the Servicer be obligated to
repurchase a Mortgage Loan on account of EPD Rights unless the Servicer shall
have previously received the repurchase payment from a third party. The Servicer
shall deposit into the Certificate Account all amounts received in connection
with the enforcement of EPD Rights, not exceeding the Purchase Price, with
respect to any Mortgage Loan. Any amounts received by the Servicer with respect
to a Mortgage Loan in excess of the Purchase Price shall be retained by the
Servicer as additional servicing compensation. The Trustee, upon receipt of
certification from the Servicer of the deposit of the Purchase Price in
connection with a repurchase of a Mortgage Loan and a Request for Release from
the Servicer, shall release or cause to be released to the purchaser of such
Mortgage Loan the related Mortgage File and shall execute and deliver

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<PAGE>

such instruments of transfer or assignment prepared by the purchaser of such
Mortgage Loan, in each case without recourse, as shall be necessary to vest in
the purchaser of such Mortgage Loan any Mortgage Loan released pursuant hereto
and the purchaser of such Mortgage Loan shall succeed to all the Trustee's
right, title and interest in and to such Mortgage Loan and all security and
documents related thereto. Such assignment shall be an assignment outright and
not for security. The purchaser of such Mortgage Loan shall thereupon own such
Mortgage Loan, and all security and documents, free of any further obligation to
the Trustee or the Certificateholders with respect thereto.

      Section 2.04 Representations and Warranties of the Depositor as to the
Mortgage Loans.

      The Depositor represents and warrants to the Trustee with respect to each
Mortgage Loan as of the date of this Agreement or such other date set forth in
this Agreement that as of the Closing Date, and following the transfer of the
Mortgage Loans to it by the Seller, the Depositor had good title to the Mortgage
Loans and the Mortgage Notes were subject to no offsets, defenses, or
counterclaims.

      The representations and warranties in this Section 2.04 shall survive
delivery of the Mortgage Files to the Trustee. Upon discovery by the Depositor
or the Trustee of any breach of any of the representations and warranties in
this Section that materially and adversely affects the interest of the
Certificateholders, the party discovering the breach shall give prompt written
notice to the others and to each Rating Agency.

      Section 2.05 Delivery of Opinion of Counsel in Connection with
Substitutions.

         (a) Notwithstanding any contrary provision of this Agreement, no
   substitution pursuant to Section 2.02 or 2.03 shall be made more than 90 days
   after the Closing Date unless the Seller delivers to the Trustee an Opinion
   of Counsel, which Opinion of Counsel shall not be at the expense of either
   the Trustee or the Trust Fund, addressed to the Trustee, to the effect that
   such substitution will not (i) result in the imposition of the tax on
   "prohibited transactions" on the Trust Fund or contributions after the
   Startup Date, as defined in sections 860F(a)(2) and 860G(d) of the Code,
   respectively or (ii) cause any REMIC created under this Agreement to fail to
   qualify as a REMIC at any time that any Certificates are outstanding.

         (b) Upon discovery by the Depositor, the Seller, 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 Trustee shall require the Seller, at the Seller's option, to
   either (i) substitute, if the conditions in Section 2.03(c) with respect to
   substitutions are satisfied, a Substitute 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 made pursuant to Section 2.03. The Trustee
   shall reconvey to the Seller 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 Execution and Delivery of Certificates.

      The Trustee acknowledges the transfer and assignment to it of the Trust
Fund and, concurrently with such transfer and assignment, has executed and
delivered to or upon the order of the Depositor, the Certificates in authorized
denominations evidencing directly or indirectly the entire ownership of the
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.
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<PAGE>

      Section 2.07 REMIC Matters.

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

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<PAGE>

                                  ARTICLE THREE

                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 this Agreement and the
Servicing Standard.

      The Servicer shall not make or permit any modification, waiver, or
amendment of any term of any Mortgage Loan that would cause any REMIC created
under this Agreement to fail to qualify as a REMIC or result in the imposition
of any tax under section 860F(a) or section 860G(d) of the Code.

      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 instruments
of satisfaction or cancellation, or of partial or full release or discharge, 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 or
the Trustee any documents requiring execution and delivery by either or both of
them 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 the
documents, the Depositor or the Trustee shall execute the documents and deliver
them to the Servicer.

      The Servicer further is authorized and empowered by the Trustee, on behalf
of the Certificateholders and the Trustee, in its own name, when the Servicer
believes it appropriate in its best judgment to register any Mortgage Loan on
the MERS(R) System, or cause the removal from the registration of any Mortgage
Loan on the MERS(R) 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.

      In accordance with and to the extent of the Servicing Standard, the
Servicer shall advance funds necessary to effect the payment of taxes and
assessments on the Mortgaged Properties, which advances shall be reimbursable in
the first instance from related collections from the Mortgagors pursuant to
Section 3.07, and further as provided in Section 3.09. The costs incurred by the
Servicer in effecting the timely payments of taxes and assessments on the
Mortgaged Properties and related insurance premiums shall not, for the purpose
of calculating monthly distributions to the Certificateholders, be added to the
Stated Principal Balances of the related Mortgage Loans, notwithstanding that
the Mortgage Loans so permit.

      Nothing in this Agreement to the contrary shall limit the Servicer from
undertaking any legal action that it may deem appropriate with respect to the
Mortgage Loans including, without limitation, any rights or causes of action
arising out of the origination of the Mortgage Loans.

                                      51
<PAGE>

      Section 3.02 [Reserved].

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

      The Depositor may, but is not obligated to, enforce the obligations of the
Servicer under this Agreement and may, but is not obligated to, perform, or
cause a designee to perform, any defaulted obligation of the Servicer under this
Agreement and in connection with any such defaulted obligation to exercise the
related rights of the Servicer under this Agreement; provided that the Servicer
shall not be relieved of any of its obligations under this Agreement by virtue
of such performance by the Depositor or its designee. Neither the Trustee nor
the Depositor shall have any responsibility or liability for any action or
failure to act by the Servicer nor shall the Trustee or the Depositor be
obligated to supervise the performance of the Servicer under this Agreement or
otherwise.

      Section 3.04 [Reserved].

      Section 3.05 Trustee to Act as Servicer.

      If the Servicer for any reason is no longer the Servicer under this
Agreement (including because of the occurrence or existence of an Event of
Default or termination by the Depositor), the Trustee or its successor shall
assume all of the rights and obligations of the Servicer under this Agreement
arising thereafter (except that the Trustee shall not be

            (i) liable for losses of the Servicer pursuant to Section 3.10 or
      any acts or omissions of the predecessor Servicer hereunder,

            (ii) obligated to make Advances if it is prohibited from doing so
      by applicable law,

            (iii) obligated to effectuate repurchases or substitutions of
      Mortgage Loans hereunder, including repurchases or substitutions
      pursuant to Section 2.02 or 2.03,

            (iv) responsible for expenses of the Servicer pursuant to Section
      2.03, or

            (v) deemed to have made any representations and warranties of the
      Servicer hereunder). Any assumption shall be subject to Section 7.02.

      Notwithstanding anything else in this Agreement to the contrary, in no
event shall the Trustee be liable for any servicing fee or for any differential
in the amount of the Servicing Fee paid under this Agreement and the amount
necessary to induce any successor Servicer to act as successor Servicer under
this Agreement and the transactions provided for in this Agreement.

      Section 3.06 Collection of Mortgage Loan Payments; Certificate Account;
Distribution Account.

          (a) In accordance with and to the extent of the Servicing Standard,
   the Servicer shall make reasonable efforts in accordance with the customary
   and usual standards of practice of prudent mortgage servicers to collect
   all payments called for under the Mortgage Loans to the extent the
   procedures are consistent with this Agreement and any related Required
   Insurance Policy. Consistent with the foregoing, the Servicer may in its
   discretion (i) waive any late payment charge or, subject to Section 3.20,
   any Prepayment Charge in connection with the prepayment of a Mortgage Loan
   and (ii) extend the due dates for payments due on a Delinquent Mortgage
   Loan for a period not greater than 125 days. In connection with a seriously
   delinquent or defaulted Mortgage Loan, the Servicer may,

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<PAGE>

   consistent with the Servicing Standard, waive, modify or vary any term
   of that Mortgage Loan (including modifications that change the Mortgage
   Rate, forgive the payment of principal or interest or extend the final
   maturity date of that Mortgage Loan ), accept payment from the related
   Mortgagor of an amount less than the Stated Principal Balance in final
   satisfaction of that Mortgage Loan, or consent to the postponement of
   strict compliance with any such term or otherwise grant indulgence to any
   Mortgagor if in the Servicer's determination such waiver, modification,
   postponement or indulgence is not materially adverse to the interests of
   the Certificateholders (taking into account any estimated loss that might
   result absent such action) and is expected to minimize the loss on such
   Mortgage Loan; provided, however, the Servicer shall not initiate new
   lending to such Mortgagor through the Trust and cannot, except as provided
   in the immediately succeeding sentence, extend the maturity of any Mortgage
   Loan past the date on which the final payment is due on the latest maturing
   Mortgage Loan as of the Cut-off Date. With respect to no more than 5% of
   the Mortgage Loans (measured by aggregate Cut-off Date Principal Balance of
   the Mortgage Loans), the Servicer may extend the maturity of a Mortgage
   Loan past the date on which the final payment is due on the latest maturing
   Mortgage Loan as of the Cut-off Date, but in no event more than one year
   past such date. In the event of any such arrangement, the Servicer shall
   make Advances on the related Mortgage Loan in accordance with Section 4.01
   during the scheduled period in accordance with the amortization schedule of
   the Mortgage Loan without modification thereof because of the arrangements.
   The Servicer shall not be required to institute or join in litigation with
   respect to collection of any payment (whether under a Mortgage, Mortgage
   Note, or otherwise or against any public or governmental authority with
   respect to a taking or condemnation) if it reasonably believes that
   enforcing the provision of the Mortgage or other instrument pursuant to
   which the payment is required is prohibited by applicable law. The Servicer
   shall not have the discretion to sell any Delinquent or defaulted Mortgage
   Loan.

           (b) [Reserved].

          (c) [Reserved].

          (d) The Servicer shall establish and maintain a Certificate Account
   into which the Servicer shall deposit on a daily basis (i) within two
   Business Days of receipt (in the case of items (i) through (iii) below) and
   (2) within one Business Day of receipt (in the case of all other items),
   except as otherwise specified herein, the following payments and
   collections received by it in respect of Mortgage Loans after the Cut-off
   Date (other than in respect of principal and interest due on the Mortgage
   Loans by the Cut-off Date) and the following amounts required to be
   deposited hereunder:

            (i) all payments on account of principal on the Mortgage Loans,
      including Principal Prepayments;

            (ii) all payments on account of interest on the Mortgage Loans,
      net of the Servicing Fee;

            (iii) all Insurance Proceeds, Subsequent Recoveries and
      Liquidation Proceeds, other than proceeds to be applied to the
      restoration or repair of the Mortgaged Property or released to the
      Mortgagor in accordance with the Servicer's normal servicing procedures;

            (iv) any amount required to be deposited by the Servicer pursuant
      to Section 3.06(f) in connection with any losses on Permitted
      Investments;

            (v) any amounts required to be deposited by the Servicer pursuant
      to Sections 3.10 and 3.12;


                                      53
<PAGE>

            (vi) all Purchase Prices from the Servicer or Seller and all
      Substitution Adjustment Amounts;

            (vii) all Advances made by the Servicer pursuant to Section 4.01;

            (viii) any other amounts required to be deposited under this
      Agreement; and

            (ix) all Prepayment Charges collected.

      In addition, with respect to any Mortgage Loan that is subject to a
buydown agreement, on each Due Date for the Mortgage Loan, in addition to the
monthly payment remitted by the Mortgagor, the Servicer shall cause funds to
be deposited into the Certificate Account in an amount required to cause an
amount of interest to be paid with respect to the Mortgage Loan equal to the
amount of interest that has accrued on the Mortgage Loan from the preceding
Due Date at the Mortgage Rate net of the Servicing Fee Rate on that date.

      The foregoing requirements for remittance by the Servicer shall be
exclusive, it being understood and agreed that, without limiting the generality
of the foregoing, payments in the nature of late payment charges or assumption
fees, if collected, need not be remitted by the Servicer. If the Servicer remits
any amount not required to be remitted, it may at any time withdraw that amount
from the Certificate Account, any provision in this Agreement to the contrary
notwithstanding. The withdrawal or direction may be accomplished by delivering
written notice of it to the Trustee or any other institution maintaining the
Certificate Account that describes the amounts deposited in error in the
Certificate Account. The Servicer shall maintain adequate records with respect
to all withdrawals made pursuant to this Section 3.06. All funds deposited in
the Certificate Account shall be held in trust for the Certificateholders until
withdrawn in accordance with Section 3.09.

          (e) The Trustee shall establish and maintain the Distribution
   Account on behalf of the Certificateholders. The Trustee shall, promptly
   upon receipt, deposit in the Distribution Account and retain in the
   Distribution Account the following:

            (i) the aggregate amount remitted by the Servicer to the Trustee
      pursuant to Section 3.09(a);

            (ii) any amount deposited by the Servicer pursuant to Section
      3.06(f) in connection with any losses on Permitted Investments; and

            (iii) any other amounts deposited under this Agreement that are
      required to be deposited in the Distribution Account.

      If the Servicer remits any amount not required to be remitted, it may at
any time direct the Trustee in writing to withdraw that amount from the
Distribution Account, any provision in this Agreement to the contrary
notwithstanding. The direction may be accomplished by delivering an Officer's
Certificate to the Trustee that describes the amounts deposited in error in the
Distribution Account. All funds deposited in the Distribution Account shall be
held by the Trustee in trust for the Certificateholders until disbursed in
accordance with this Agreement or withdrawn in accordance with Section 3.09. In
no event shall the Trustee incur liability for withdrawals from the Distribution
Account at the direction of the Servicer.

          (f) Each institution at which the Certificate Account is maintained
   shall invest the funds in such account as directed in writing by the
   Servicer in Permitted Investments, which shall mature not

                                      54
<PAGE>

   later than the second Business Day preceding the related Distribution
   Account Deposit Date (except that if the Permitted Investment is an
   obligation of the institution that maintains the account, then the
   Permitted Investment shall mature not later than the Business Day
   preceding the Distribution Account Deposit Date) and which shall not be
   sold or disposed of before its maturity. The funds in the Distribution
   Account shall remain uninvested. All such Permitted Investments shall be
   made in the name of the Trustee, for the benefit of the
   Certificateholders. All income realized from any such investment of
   funds on deposit in the Certificate Account shall be for the benefit of
   the Servicer as servicing compensation and shall be remitted to it
   monthly as provided in this Agreement. The amount of any realized losses
   on Permitted Investments in the Certificate Account shall promptly be
   deposited by the Servicer in the Certificate Account. The Trustee shall
   not be liable for the amount of any loss incurred in respect of any
   investment or lack of investment of funds held in the Certificate
   Account and made in accordance with this Section 3.06.

          (g) [Reserved].

          (h) The Servicer shall give notice to the Trustee, the Seller, each
   Rating Agency and the Depositor of any proposed change of the location of
   the Certificate Account not later than 30 days and not more than 45 days
   prior to any change of this Agreement. The Trustee shall give notice to the
   Servicer, the Seller, each Rating Agency and the Depositor of any proposed
   change of the location of the Distribution Account not later than 30 days
   and not more than 45 days prior to any change of this Agreement.

      Section 3.07 Collection of Taxes, Assessments and Similar Items; Escrow
Accounts.

          (a) To the extent required by the related Mortgage Note and not
   violative of current law, the Servicer shall establish and maintain one or
   more accounts (each, an "Escrow Account") and deposit and retain therein
   all collections from the Mortgagors (or advances) for the payment of taxes,
   assessments, hazard insurance premiums or comparable items for the account
   of the Mortgagors. Nothing herein shall require the Servicer to compel a
   Mortgagor to establish an Escrow Account in violation of applicable law.

           (b) Withdrawals of amounts so collected from the Escrow Accounts may
   be made only to effect timely payment of taxes, assessments, hazard
   insurance premiums, condominium or PUD association dues, or comparable
   items, to reimburse (without duplication) the Servicer out of related
   collections for any payments made pursuant to Section 3.01 (with respect to
   taxes and assessments and insurance premiums) and Section 3.10 (with
   respect to hazard insurance), to refund to any Mortgagors any sums
   determined to be overages, to pay interest, if required by law or the
   related Mortgage or Mortgage Note, to Mortgagors on balances in the Escrow
   Account or to clear and terminate the Escrow Account at the termination of
   this Agreement in accordance with Section 9.01. The Escrow Accounts shall
   not be a part of the Trust Fund.

         (c) The Servicer shall advance any payments referred to in Section
  3.07(a) that are not timely paid by the Mortgagors or advanced by the
  Servicer on the date when the tax, premium or other cost for which such
  payment is intended is due, but the Servicer shall be required so to
  advance only to the extent that such advances, in the good faith
  judgment of the Servicer, will be recoverable by the Servicer out of
  Insurance Proceeds, Liquidation Proceeds or otherwise.

                                      55
<PAGE>

      Section 3.08 Access to Certain Documentation and Information Regarding
the Mortgage Loans.

      The Servicer shall afford the Depositor and the Trustee reasonable access
to all records and documentation regarding the Mortgage Loans and all accounts,
insurance information and other matters relating to this Agreement, such access
being afforded without charge, but only upon reasonable request and during
normal business hours at the office designated by the Servicer.

      Upon reasonable advance notice in writing, the Servicer will provide to
each Certificateholder or Certificate Owner that is a savings and loan
association, bank, or insurance company certain reports and reasonable access to
information and documentation regarding the Mortgage Loans sufficient to permit
the Certificateholder or Certificate Owner to comply with applicable regulations
of the OTS or other regulatory authorities with respect to investment in the
Certificates. The Servicer shall be entitled to be reimbursed by each such
Certificateholder or Certificate Owner for actual expenses incurred by the
Servicer in providing the reports and access.

      Section 3.09 Permitted Withdrawals from the Certificate Account and the
Distribution Account.

          (a) The Servicer may (and, in the case of clause (ix) below, shall)
   from time to time make withdrawals from the Certificate Account for the
   following purposes:

             (i) to pay to the Servicer (to the extent not previously retained)
      the servicing compensation to which it is entitled pursuant to Section
      3.15, and to pay to the Servicer, as additional servicing compensation,
      earnings on or investment income with respect to funds in or credited to
      the Certificate Account;

            (ii) to reimburse the Servicer or successor Servicer for the
      unreimbursed Advances made by it, such right of reimbursement pursuant
      to this subclause (ii) being limited to amounts received on the Mortgage
      Loans in respect of which the Advance was made;

            (iii) to reimburse the Servicer or successor Servicer for any
      Nonrecoverable Advance previously made by it;

            (iv) to reimburse the Servicer for Insured Expenses from the
      related Insurance Proceeds;

            (v) to reimburse the Servicer for (a) unreimbursed Servicing
      Advances, the Servicer's right to reimbursement pursuant to this clause
      (a) with respect to any Mortgage Loan being limited to amounts received
      on the Mortgage Loans that represent late recoveries of the payments for
      which the advances were made pursuant to Section 3.01 or Section 3.07,
      (b) unreimbursed Servicing Advances made in respect of a Mortgage Loan
      for which such Servicing Advances are not recoverable from the Mortgagor
      and (c) for unpaid Servicing Fees as provided in Section 3.12;

            (vi) to pay to the purchaser, with respect to each Mortgage Loan
      or property acquired in respect of such Mortgage Loan that has been
      purchased pursuant to Section 2.02, 2.03, or 3.12, all amounts received
      thereon after the date of such purchase;

            (vii) to reimburse the Seller, the Servicer, or the Depositor for
      expenses incurred by any of them and reimbursable pursuant to Section
      6.03;


                                      56
<PAGE>

            (viii) to withdraw any amount deposited in the Certificate Account
       and not required to be deposited in the Certificate Account;

            (ix) by the Distribution Account Deposit Date, to withdraw (1) the
      Available Funds and the Trustee Fee for the Distribution Date, to the
      extent on deposit, and (2) the Prepayment Charges on deposit, and remit
      such amount to the Trustee for deposit in the Distribution Account; and

            (x) to clear and terminate the Certificate Account upon
      termination of this Agreement pursuant to Section 9.01.

       The Servicer shall keep and maintain separate accounting, on a Mortgage
Loan by Mortgage Loan basis, to justify any withdrawal from the Certificate
Account pursuant to subclauses (i), (ii), (iv), (v), and (vi). Before making any
withdrawal from the Certificate Account pursuant to subclause (iii), the
Servicer shall deliver to the Trustee an Officer's Certificate of a Servicing
Officer indicating the amount of any previous Advance determined by the Servicer
to be a Nonrecoverable Advance and identifying the related Mortgage Loans and
their respective portions of the Nonrecoverable Advance.

          (b) The Trustee shall withdraw funds from the Distribution Account
   for distributions to Certificateholders in the manner specified in this
   Agreement (and to withhold from the amounts so withdrawn the amount of any
   taxes that it is authorized to withhold pursuant to the last paragraph of
   Section 8.11). In addition, the Trustee may from time to time make
   withdrawals from the Distribution Account for the following purposes:

            (i) to pay to itself the Trustee Fee for the related Distribution
      Date;

            (ii) to withdraw and return to the Servicer any amount deposited
      in the Distribution Account and not required to be deposited therein;
      and

            (iii) to clear and terminate the Distribution Account upon
      termination of the Agreement pursuant to Section 9.01.

          (c) [Reserved].

      Section 3.10 Maintenance of Hazard Insurance; Maintenance of Primary
Insurance Policies.

          (a) The Servicer shall maintain, for each Mortgage Loan, hazard
   insurance with extended coverage in an amount that is at least equal to the
   lesser of

            (i) the maximum insurable value of the improvements securing the
      Mortgage Loan and

            (ii) the greater of (y) the outstanding principal balance of the
      Mortgage Loan and (z) an amount such that the proceeds of the policy are
      sufficient to prevent the Mortgagor or the mortgagee from becoming a
      co-insurer.

      Each policy of standard hazard insurance shall contain, or have an
accompanying endorsement that contains, a standard mortgagee clause. Any amounts
collected under the policies (other than the amounts to be applied to the
restoration or repair of the related Mortgaged Property or amounts released to
the Mortgagor in accordance with the Servicer's normal servicing procedures)
shall be deposited in the Certificate Account. Any cost incurred in maintaining
any insurance shall not, for the purpose of

                                      57
<PAGE>

calculating monthly distributions to the Certificateholders or remittances to
the Trustee for their benefit, be added to the principal balance of the
Mortgage Loan, notwithstanding that the Mortgage Loan so permits. Such costs
shall be recoverable by the Servicer out of late payments by the related
Mortgagor or out of Liquidation Proceeds to the extent permitted by Section
3.09. No earthquake or other additional insurance is to be required of any
Mortgagor or maintained on property acquired in respect of a Mortgage other
than pursuant to any applicable laws and regulations in force that require
additional insurance. If the Mortgaged Property is located at the time of
origination of the Mortgage Loan in a federally designated special flood
hazard area and the area is participating in the national flood insurance
program, the Servicer shall maintain flood insurance for the Mortgage Loan.
The flood insurance shall be in an amount equal to the least of (i) the
original principal balance of the related Mortgage Loan, (ii) the replacement
value of the improvements that are part of the Mortgaged Property, and (iii)
the maximum amount of flood insurance available for the related Mortgaged
Property under the national flood insurance program.

      If the Servicer obtains and maintains a blanket policy insuring against
hazard losses on all of the Mortgage Loans, it shall have satisfied its
obligations in the first sentence of this Section 3.10. The policy may contain a
deductible clause on terms substantially equivalent to those commercially
available and maintained by comparable servicers. If the policy contains a
deductible clause and a policy complying with the first sentence of this Section
3.10 has not been maintained on the related Mortgaged Property, and if a loss
that would have been covered by the required policy occurs, the Servicer shall
deposit in the Certificate Account, without any right of reimbursement, the
amount not otherwise payable under the blanket policy because of the deductible
clause. In connection with its activities as Servicer of the Mortgage Loans, the
Servicer agrees to present, on behalf of itself, the Depositor, and the Trustee
for the benefit of the Certificateholders, claims under any blanket policy.

          (b) The Servicer shall not take any action that would result in
   non-coverage under any applicable Primary Insurance Policy of any loss
   that, but for the actions of the Servicer, would have been covered
   thereunder. The Servicer shall not cancel or refuse to renew any Primary
   Insurance Policy that is in effect at the date of the initial issuance of
   the Certificates and is required to be kept in force hereunder unless the
   replacement Primary Insurance Policy for the canceled or non-renewed policy
   is maintained with a Qualified Insurer. The Servicer need not maintain any
   Primary Insurance Policy if maintaining the Primary Insurance Policy is
   prohibited by applicable law. The Servicer agrees, to the extent permitted
   by applicable law, to effect the timely payment of the premiums on each
   Primary Insurance Policy, and any costs not otherwise recoverable shall be
   recoverable by the Servicer from the related liquidation proceeds.

      In connection with its activities as Servicer of the Mortgage Loans, the
Servicer agrees to present, on behalf of itself, the Trustee and the
Certificateholders, claims to the insurer under any Primary Insurance Policies
and, in this regard, to take any reasonable action in accordance with the
Servicing Standard necessary to permit recovery under any Primary Insurance
Policies respecting defaulted Mortgage Loans. Any amounts collected by the
Servicer under any Primary Insurance Policies shall be deposited in the
Certificate Account.

      Section 3.11 Enforcement of Due-On-Sale Clauses; Assumption Agreements.

          (a) Except as otherwise provided in this Section 3.11, when any
   property subject to a Mortgage has been conveyed by the Mortgagor, the
   Servicer shall to the extent that it has knowledge of the conveyance and in
   accordance with the Servicing Standard, enforce any due-on-sale clause
   contained in any Mortgage Note or Mortgage, to the extent permitted under
   applicable law and governmental regulations, but only to the extent that
   enforcement will not adversely affect or jeopardize coverage under any
   Required Insurance Policy. Notwithstanding the foregoing, the

                                      58
<PAGE>

   Servicer is not required to exercise these rights with respect to a
   Mortgage Loan if the Person to whom the related Mortgaged Property has
   been conveyed or is proposed to be conveyed satisfies the conditions
   contained in the Mortgage Note and Mortgage related thereto and the
   consent of the mortgagee under the Mortgage Note or Mortgage is not
   otherwise so required under the Mortgage Note or Mortgage as a condition
   to the transfer.

      If (i) the Servicer is prohibited by law from enforcing any due-on-sale
clause, (ii) coverage under any Required Insurance Policy would be adversely
affected, (iii) the Mortgage Note does not include a due-on-sale clause, or (iv)
nonenforcement is otherwise permitted hereunder, the Servicer is authorized,
subject to Section 3.11(b), to take or enter into an assumption and modification
agreement from or with the person to whom the property has been or is about to
be conveyed, pursuant to which the person becomes liable under the Mortgage Note
and, unless prohibited by applicable state law, the Mortgagor remains liable
thereon. The Mortgage Loan must continue to be covered (if so covered before the
Servicer enters into the agreement) by the applicable Required Insurance
Policies.

      The Servicer, subject to Section 3.11(b), is also authorized with the
prior approval of the insurers under any Required Insurance Policies to enter
into a substitution of liability agreement with the Person, pursuant to which
the original Mortgagor is released from liability and the Person is substituted
as Mortgagor and becomes liable under the Mortgage Note. Notwithstanding the
foregoing, the Servicer shall not be deemed to be in default under this Section
3.11 because of any transfer or assumption that the Servicer reasonably believes
it is restricted by law from preventing, for any reason whatsoever.

          (b) Subject to the Servicer's duty to enforce any due-on-sale clause
   to the extent set forth in Section 3.11(a), in any case in which a
   Mortgaged Property has been conveyed to a Person by a Mortgagor, and the
   Person is to enter into an assumption agreement or modification agreement
   or supplement to the Mortgage Note or Mortgage that requires the signature
   of the Trustee, or if an instrument of release signed by the Trustee is
   required releasing the Mortgagor from liability on the Mortgage Loan, the
   Servicer shall prepare and deliver to the Trustee for signature and shall
   direct the Trustee, in writing, to execute the assumption agreement with
   the Person to whom the Mortgaged Property is to be conveyed, and the
   modification agreement or supplement to the Mortgage Note or Mortgage or
   other instruments appropriate to carry out the terms of the Mortgage Note
   or Mortgage or otherwise to comply with any applicable laws regarding
   assumptions or the transfer of the Mortgaged Property to the Person. In
   connection with any such assumption, no material term of the Mortgage Note
   may be changed.

      In addition, the substitute Mortgagor and the Mortgaged Property must be
acceptable to the Servicer in accordance with its underwriting standards as then
in effect. Together with each substitution, assumption, or other agreement or
instrument delivered to the Trustee for execution by it, the Servicer shall
deliver an Officer's Certificate signed by a Servicing Officer stating that the
requirements of this subsection have been met in connection with such Officer's
Certificate. The Servicer shall notify the Trustee that any substitution or
assumption agreement has been completed by forwarding to the Trustee the
original of the substitution or assumption agreement, which in the case of the
original shall be added to the related Mortgage File and shall, for all
purposes, be considered a part of the Mortgage File to the same extent as all
other documents and instruments constituting a part of the Mortgage File. The
Servicer will retain any fee collected by it for entering into an assumption or
substitution of liability agreement as additional servicing compensation.

      Section 3.12 Realization Upon Defaulted Mortgage Loans.

      The Servicer shall use reasonable efforts in accordance with the Servicing
Standard to foreclose on or otherwise comparably convert the ownership of assets
securing such of the Mortgage Loans as

                                      59
<PAGE>

come into and continue in default and as to which no satisfactory arrangements
can be made for collection of delinquent payments. In connection with the
foreclosure or other conversion, the Servicer shall follow the Servicing
Standard and shall follow the requirements of the insurer under any Required
Insurance Policy. The Servicer shall not be required to expend its own funds
in connection with any foreclosure or towards the restoration of any property
unless it determines (i) that the restoration or foreclosure will increase the
proceeds of liquidation of the Mortgage Loan after reimbursement to itself of
restoration expenses and (ii) that restoration expenses will be recoverable to
it through Liquidation Proceeds (respecting which it shall have priority for
purposes of withdrawals from the Certificate Account). The Servicer shall be
responsible for all other costs and expenses incurred by it in any foreclosure
proceedings. The Servicer is entitled to reimbursement of such costs and
expenses from the liquidation proceeds with respect to the related Mortgaged
Property, as provided in the definition of Liquidation Proceeds. If the
Servicer has knowledge that a Mortgaged Property that the Servicer is
contemplating acquiring in foreclosure or by deed in lieu of foreclosure is
located within a one mile radius of any site listed in the Expenditure Plan
for the Hazardous Substance Clean Up Bond Act of 1984 or other site with
environmental or hazardous waste risks known to the Servicer, the Servicer
will, before acquiring the Mortgaged Property, consider the risks and only
take action in accordance with its established environmental review
procedures.

      With respect to any REO Property, the deed or certificate of sale shall be
taken in the name of the Trustee for the benefit of the Certificateholders, or
its nominee, on behalf of the Certificateholders. The Trustee's name shall be
placed on the title to the REO Property solely as the Trustee hereunder and not
in its individual capacity. The Servicer shall ensure that the title to the REO
Property references the Pooling and Servicing Agreement and the Trustee's
capacity hereunder. Pursuant to its efforts to sell the REO Property, the
Servicer shall either itself or through an agent selected by the Servicer
protect and conserve the REO Property in accordance with the Servicing Standard.

      The Servicer shall perform the tax reporting and withholding required by
sections 1445 and 6050J of the Code with respect to foreclosures and
abandonments, the tax reporting required by section 6050H of the Code with
respect to the receipt of mortgage interest from individuals and, if required by
section 6050P of the Code with respect to the cancellation of indebtedness by
certain financial entities, by preparing any required tax and information
returns, in the form required.

      If the Trust Fund acquires any Mortgaged Property as aforesaid or
otherwise in connection with a default or imminent default on a Mortgage Loan,
the REO Property shall only be held temporarily, shall be actively marketed for
sale, and the Servicer shall dispose of the Mortgaged Property as soon as
practicable, and in any case before the end of the third calendar year following
the calendar year in which the Trust Fund acquires the property. Notwithstanding
any other provision of this Agreement, no Mortgaged Property acquired by the
Trust Fund shall be rented (or allowed to continue to be rented) or otherwise
used for the production of income by or on behalf of the Trust Fund.

      The decision of the Servicer to foreclose on a defaulted Mortgage Loan
shall be subject to a determination by the Servicer that the proceeds of the
foreclosure would exceed the costs and expenses of bringing a foreclosure
proceeding. The proceeds received from the maintenance of any REO Properties,
net of reimbursement to the Servicer for costs incurred (including any property
or other taxes) in connection with maintenance of the REO Properties and net of
unreimbursed Servicing Fees, Advances, and Servicing Advances, shall be applied
to the payment of principal of and interest on the related defaulted Mortgage
Loans (with interest accruing as though the Mortgage Loans were still current
and adjustments, if applicable, to the Mortgage Rate were being made in
accordance with the Mortgage Note) and all such proceeds shall be deemed, for
all purposes in this Agreement, to be payments on account of principal and
interest on the related Mortgage Notes and shall be deposited into the
Certificate Account. To the extent the net proceeds received during any calendar
month exceeds the amount attributable to

                                      60
<PAGE>

amortizing principal and accrued interest at the related Mortgage Rate on the
related Mortgage Loan for the calendar month, the excess shall be considered
to be a partial prepayment of principal of the related Mortgage Loan.

      The proceeds from any liquidation of a Mortgage Loan, as well as any
proceeds from an REO Property, will be applied in the following order of
priority: first, to reimburse the Servicer for any related unreimbursed
Servicing Advances or Servicing Fees or for any related unreimbursed Advances,
as applicable; second, to reimburse the Servicer, as applicable, and to
reimburse the Certificate Account for any Nonrecoverable Advances (or portions
thereof) that were previously withdrawn by the Servicer pursuant to Section
3.09(a)(iii) that related to the Mortgage Loan; third, to accrued and unpaid
interest (to the extent no Advance has been made for such amount or any such
Advance has been reimbursed) on the Mortgage Loan or related REO Property, at
the Adjusted Net Mortgage Rate to the Due Date occurring in the month in which
such amounts are required to be distributed; and fourth, as a recovery of
principal of the Mortgage Loan. The Servicer will retain any Excess Proceeds
from the liquidation of a Liquidated Mortgage Loan as additional servicing
compensation pursuant to Section 3.15.

      The Servicer may agree to a modification of any Mortgage Loan at the
request of the related Mortgagor if (i) the modification is in lieu of a
refinancing and (ii) the Servicer purchases that Mortgage Loan from the Trust
Fund as described below. Upon the agreement of the Servicer to modify a Mortgage
Loan in accordance with the preceding sentence, the Servicer shall purchase that
Mortgage Loan and all interest of the Trustee in that Mortgage Loan shall
automatically be deemed transferred and assigned to the Servicer and all
benefits and burdens of ownership thereof, including the right to accrued
interest thereon from the date of purchase and the risk of default thereon,
shall pass to the Servicer. The Servicer shall promptly deliver to the Trustee a
certification of a Servicing Officer to the effect that all requirements of this
paragraph have been satisfied with respect to a Mortgage Loan to be repurchased
pursuant to this paragraph.

      The Servicer shall deposit the Purchase Price for any Mortgage Loan
repurchased pursuant to Section 3.12 in the Certificate Account pursuant to
Section 3.06 within one Business Day after the purchase of the Mortgage Loan.
Upon receipt by the Trustee of written notification of any such deposit signed
by a Servicing Officer, the Trustee shall release to the Servicer the related
Mortgage File and shall execute and deliver such instruments of transfer or
assignment, in each case without recourse, as shall be necessary to vest in the
Servicer any Mortgage Loan previously transferred and assigned pursuant hereto.
The Servicer covenants and agrees to indemnify the Trust Fund against any
liability for any "prohibited transaction" taxes and any related interest,
additions, and penalties imposed on the Trust Fund established hereunder as a
result of any modification of a Mortgage Loan effected pursuant to this Section,
or any purchase of a Mortgage Loan by the Servicer in connection with a
modification (but such obligation shall not prevent the Servicer or any other
appropriate Person from contesting any such tax in appropriate proceedings and
shall not prevent the Servicer from withholding payment of such tax, if
permitted by law, pending the outcome of such proceedings). The Servicer shall
have no right of reimbursement for any amount paid pursuant to the foregoing
indemnification, except to the extent that the amount of any tax, interest, and
penalties, together with interest thereon, is refunded to the Trust Fund.

      Section 3.13 Trustee to Cooperate; Release of Mortgage Files.

      Upon the payment in full of any Mortgage Loan, or the receipt by the
Servicer of a notification that payment in full will be escrowed in a manner
customary for such purposes, the Servicer will immediately notify the Trustee by
delivering a Request for Release substantially in the form of Exhibit N. Upon
receipt of the request, the Trustee shall promptly release the related Mortgage
File to the Servicer, and the Trustee shall at the Servicer's direction execute
and deliver to the Servicer the request for reconveyance, deed of reconveyance,
or release or satisfaction of mortgage or such instrument releasing

                                      61
<PAGE>

the lien of the Mortgage in each case provided by the Servicer, together with
the Mortgage Note with written evidence of cancellation thereon. The Servicer
is authorized to cause the removal from the registration on the MERS System of
such Mortgage and to execute and deliver, on behalf of the Trustee and the
Certificateholders or any of them, any and all instruments of satisfaction or
cancellation or of partial or full release. Expenses incurred in connection
with any instrument of satisfaction or deed of reconveyance shall be
chargeable to the related Mortgagor.

      From time to time and as shall be appropriate for the servicing or
foreclosure of any Mortgage Loan, including for such purpose collection under
any policy of flood insurance, any fidelity bond or errors or omissions policy,
or for the purposes of effecting a partial release of any Mortgaged Property
from the lien of the Mortgage or the making of any corrections to the Mortgage
Note or the Mortgage or any of the other documents included in the Mortgage
File, the Trustee shall, upon delivery to the Trustee of a Request for Release
in the form of Exhibit M signed by a Servicing Officer, release the Mortgage
File to the Servicer or its designee. Subject to the further limitations set
forth below, the Servicer shall cause the Mortgage File or documents so released
to be returned to the Trustee when the need therefor by the Servicer no longer
exists, unless the Mortgage Loan is liquidated and the proceeds thereof are
deposited in the Certificate Account, in which case the Servicer shall deliver
to the Trustee a Request for Release in the form of Exhibit N, signed by a
Servicing Officer.

      If the Servicer at any time seeks to initiate a foreclosure proceeding in
respect of any Mortgaged Property as authorized by this Agreement, the Servicer
shall deliver to the Trustee, for signature, as appropriate, any court
pleadings, requests for trustee's sale, or other documents necessary to
effectuate such foreclosure or any legal action brought to obtain judgment
against the Mortgagor on the Mortgage Note or the Mortgage or to obtain a
deficiency judgment or to enforce any other remedies or rights provided by the
Mortgage Note or the Mortgage or otherwise available at law or in equity.

      Section 3.14 Documents, Records and Funds in Possession of the Servicer
to be Held for the Trustee.

      The Servicer shall account fully to the Trustee for any funds it receives
or otherwise collects as Liquidation Proceeds or Insurance Proceeds in respect
of any Mortgage Loan. All Mortgage Files and funds collected or held by, or
under the control of, the Servicer in respect of any Mortgage Loans, whether
from the collection of principal and interest payments or from Liquidation
Proceeds, including any funds on deposit in the Certificate Account, shall be
held by the Servicer for and on behalf of the Trustee and shall be and remain
the sole and exclusive property of the Trustee, subject to the applicable
provisions of this Agreement. The Servicer also agrees that it shall not create,
incur or subject any Mortgage File or any funds that are deposited in the
Certificate Account, Distribution Account, or any Escrow Account, or any funds
that otherwise are or may become due or payable to the Trustee for the benefit
of the Certificateholders, to any claim, lien, security interest, judgment,
levy, writ of attachment, or other encumbrance, or assert by legal action or
otherwise any claim or right of setoff against any Mortgage File or any funds
collected on, or in connection with, a Mortgage Loan, except, however, that the
Servicer shall be entitled to set off against and deduct from any such funds any
amounts that are properly due and payable to the Servicer under this Agreement.

      Section 3.15 Servicing Compensation.

      As compensation for its activities hereunder, the Servicer may retain or
withdraw from the Certificate Accoun


 
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