PNC MORTGAGE SECURITIES CORP
8-K, 1998-05-08
FINANCE SERVICES
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<PAGE>



                         SECURITIES AND EXCHANGE COMMISSION
                                          
                               WASHINGTON, DC  20549
                                          
                                      FORM 8-K
                                   CURRENT REPORT
                                          
       PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
                                          
                                   APRIL 29, 1998
                         (DATE OF EARLIEST EVENT REPORTED)
                                          
                           PNC MORTGAGE SECURITIES CORP.
                      AS DEPOSITOR AND MASTER SERVICER UNDER A
                          POOLING AND SERVICING AGREEMENT
                              DATED AS OF APRIL 1, 1998
                           PROVIDING FOR THE ISSUANCE OF
                                          
                                  $826,626,546.00
                                          
                         MORTGAGE PASS-THROUGH CERTIFICATES
                                   SERIES 1998-4

             Delaware                   333-38121           T/B/D

          (State or other             (Commission           (IRS Employer
          jurisdiction of            File Number)           Identification
          Incorporation)                                    Number)

                               75 NORTH FAIRWAY DRIVE
                           VERNON HILLS, ILLINOIS  60061
                                          
                      (Address of principal executive offices)
                                          
                Registrant's telephone number, including area code:
                                          
                                   (847) 549-6500
                                          

<PAGE>
 
Item 1.   CHANGES IN CONTROL OF REGISTRANT.  Not applicable.

Item 2.   ACQUISITION OR DISPOSITION OF ASSETS.  Not applicable.

Item 3.   BANKRUPTCY OR RECEIVERSHIP.  Not applicable.

Item 4.   CHANGES IN REGISTRANT'S CERTIFYING ACCOUNTANT.  Not applicable.

Item 5.   OTHER EVENTS.  Not applicable.

Item 6.   RESIGNATION OF REGISTRANT'S DIRECTORS.  Not applicable.

Item 7.   FINANCIAL STATEMENTS AND EXHIBITS.

          The following exhibit is furnished herewith:

          7.1  Pooling and Servicing Agreement between PNC Mortgage Securities
               Corp., Depositor and Master Servicer, and U.S. Bank National
               Association, Trustee, dated as of April 1, 1998.

Item 8.   CHANGE IN FISCAL YEAR.  Not applicable.

Item 9.   SALES OF EQUITY SECURITIES PURSUANT TO REGULATION S.  Not applicable.



                                       2

<PAGE>


                                      SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

Dated: May 6, 1998.

                         PNC MORTGAGE SECURITIES
                         CORP. 
                         (Registrant)

                         By:  \s\ Thomas G. Lehmann
                              --------------------------------
                              Thomas G. Lehmann
                              Vice President
                              (Authorized Officer)









                                       3

<PAGE>

                                                                     EXHIBIT 7.1

                                                               EXECUTION VERSION


                           PNC MORTGAGE SECURITIES CORP.,

                          as Depositor and Master Servicer

                                        and

                                     U.S. BANK

                               NATIONAL ASSOCIATION,

                                     as Trustee


                          POOLING AND SERVICING AGREEMENT

                                  $836,031,000.63

                           PNC Mortgage Securities Corp.

                         Mortgage Pass-Through Certificates

                                   Series 1998-4

                            Cut-Off Date:  April 1, 1998


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                                  TABLE OF CONTENTS

<TABLE>
<CAPTION>
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<S>                                                                        <C>
ARTICLE I         5

       Section 1.01.  Definitions  . . . . . . . . . . . . . . . . . . . . . 5

Accretion Directed Classes . . . . . . . . . . . . . . . . . . . . . . . . . 5

Accretion Directed Components. . . . . . . . . . . . . . . . . . . . . . . . 5

Aggregate Certificate Principal Balance. . . . . . . . . . . . . . . . . . . 5

Appraised Value      . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Assignment of Proprietary Lease. . . . . . . . . . . . . . . . . . . . . . . 5

Authenticating Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Authorized Denomination. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Balloon Loan         . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Bankruptcy Coverage  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Bankruptcy Coverage Initial Amount . . . . . . . . . . . . . . . . . . . . . 6

Bankruptcy Loss      . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Beneficial Holder    . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Book-Entry Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Business Day         . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Buydown Agreement    . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Buydown Fund         . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Buydown Fund Account . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Buydown Loan         . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Certificate          . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Certificate Account  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Certificateholder or Holder. . . . . . . . . . . . . . . . . . . . . . . . . 7

Certificate Group    . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Certificate Principal Balance. . . . . . . . . . . . . . . . . . . . . . . . 8

Certificate Register and Certificate Registrar . . . . . . . . . . . . . . . 8

Class                . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Class A Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Class B Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Class C-B-1 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Class C-B-2 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . 8


                                         -i-
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<CAPTION>
                                  TABLE OF CONTENTS
                                     (CONTINUED)

                                                                           PAGE
<S>                                                                        <C>
Class C-B-3 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Class C-B-4 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Class C-B-5 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Class C-B-6 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Class P Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Class P-L Regular Interests. . . . . . . . . . . . . . . . . . . . . . . . . 9

Class P Fraction     . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Class P Mortgage Loan. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Class W-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . . . 9

Class X Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Class X-L Regular Interests. . . . . . . . . . . . . . . . . . . . . . . . . 9

Class Y-L Regular Interests. . . . . . . . . . . . . . . . . . . . . . . . . 9

Class Y-1-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . . 9

Class Y-1-L Principal Distribution Amount. . . . . . . . . . . . . . . . . . 9

Class Y-2-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . . 9

Class Y-2-L Principal Distribution Amount. . . . . . . . . . . . . . . . . . 9

Class Y-3-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . .10

Class Y-3-L Principal Distribution Amount. . . . . . . . . . . . . . . . . .10

Class Y-4-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . .10

Class Y-4-L Principal Distribution Amount. . . . . . . . . . . . . . . . . .10

CLASS Y-L PRINCIPAL REDUCTION AMOUNTS. . . . . . . . . . . . . . . . . . . .10

Class Z-L Regular Interests. . . . . . . . . . . . . . . . . . . . . . . . .20

Class Z-1-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . .21

Class Z-1-L Principal Distribution Amount. . . . . . . . . . . . . . . . . .21

Class Z-2-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . .21

Class Z-2-L Principal Distribution Amount. . . . . . . . . . . . . . . . . .21

Class Z-3-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . .21

Class Z-3-L Principal Distribution Amount. . . . . . . . . . . . . . . . . .21

Class Z-4-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . .21

Class Z-4-L Principal Distribution Amount. . . . . . . . . . . . . . . . . .21

Class I-A-1 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . .21

                                         -ii-
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                                  TABLE OF CONTENTS
                                     (CONTINUED)

<CAPTION>
                                                                           PAGE
<S>                                                                        <C>
Class I-P Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Class I-P-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . .21

Class I-P Fraction   . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Class I-P Mortgage Loan. . . . . . . . . . . . . . . . . . . . . . . . . . .22

Class I-X Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Class I-X-L Regular Interest . . . . . . . . . . . . . . . . . . . . . . . .22

Class I-X Notional Amount. . . . . . . . . . . . . . . . . . . . . . . . . .22

Class II-A-1 Certificates. . . . . . . . . . . . . . . . . . . . . . . . . .22

Class II-P Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . .22

Class II-P-L Regular Interest. . . . . . . . . . . . . . . . . . . . . . . .22

Class II-P Fraction  . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Class II-P Mortgage Loan . . . . . . . . . . . . . . . . . . . . . . . . . .22

Class II-X Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . .22

Class II-X-L Regular Interest. . . . . . . . . . . . . . . . . . . . . . . .22

Class II-X Notional Amount . . . . . . . . . . . . . . . . . . . . . . . . .22

Class III-A-1 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-2 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-3 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-4 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-5 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-6 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-7 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-8 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-9 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-10 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-11 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-11 Accretion Termination Date. . . . . . . . . . . . . . . . . .23

Class III-A-11 Accrual Amount. . . . . . . . . . . . . . . . . . . . . . . .23

Class III-A-12 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .24

Class III-A-13 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .24

Class III-A-14 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .24


                                        -iii-
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                                  TABLE OF CONTENTS
                                     (CONTINUED)

<CAPTION>
                                                                           PAGE
<S>                                                                        <C>
Class III-A-15 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .24

Class III-A-16 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .24

Class III-A-16 Accretion Termination Date. . . . . . . . . . . . . . . . . .24

Class III-A-16 Accrual Amount. . . . . . . . . . . . . . . . . . . . . . . .24

Class III-A-17 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .24

Class III-A-17 Accretion Termination Date. . . . . . . . . . . . . . . . . .24

Class III-A-17 Accrual Amount. . . . . . . . . . . . . . . . . . . . . . . .24

Class III-A-18 Certificates. . . . . . . . . . . . . . . . . . . . . . . . .24

Class III-B-1 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .24

Class III-B-2 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .24

Class III-B-3 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-B-4 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-B-5 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-B-6 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-P Certificates . . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-P Fraction . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-P Mortgage Loan. . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-X-1 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-X-1-L Regular Interest . . . . . . . . . . . . . . . . . . . . . .25

Class III-X-1 Notional Amount. . . . . . . . . . . . . . . . . . . . . . . .25

Class III-X-1 Premium Rate Mortgage Loans. . . . . . . . . . . . . . . . . .25

Class III-X-2 Certificates . . . . . . . . . . . . . . . . . . . . . . . . .25

Class III-X-2-L Regular Interest . . . . . . . . . . . . . . . . . . . . . .25

Class III-X-2 Notional Amount. . . . . . . . . . . . . . . . . . . . . . . .25

Class III-X-2 Premium Rate Mortgage Loans. . . . . . . . . . . . . . . . . .26

Class IV-A-1 Certificates. . . . . . . . . . . . . . . . . . . . . . . . . .26

Class IV-A-2 Certificates. . . . . . . . . . . . . . . . . . . . . . . . . .26

Class IV-P Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . .26

Class IV-P-L Regular Interest. . . . . . . . . . . . . . . . . . . . . . . .26

Class IV-P Fraction  . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Class IV-P Mortgage Loan . . . . . . . . . . . . . . . . . . . . . . . . . .26


                                         -iv-
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                                  TABLE OF CONTENTS
                                     (CONTINUED)

<CAPTION>
                                                                           PAGE
<S>                                                                        <C>
Class IV-X Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . .26

Class IV-X-L Regular Interest. . . . . . . . . . . . . . . . . . . . . . . .26

Class IV-X Notional Amount . . . . . . . . . . . . . . . . . . . . . . . . .26

Class Notional Amount. . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Class Principal Balance. . . . . . . . . . . . . . . . . . . . . . . . . . .26

Class R-1 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Class R-2 Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Clearing Agency      . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Closing Date         . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Code                 . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Combined Bankruptcy Coverage . . . . . . . . . . . . . . . . . . . . . . . .28

Combined Credit Support Depletion Date . . . . . . . . . . . . . . . . . . .28

Component            . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Component III-A-8-1  . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Component III-A-8-2  . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Component III-A-10-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Component III-A-10-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Component Principal Balance. . . . . . . . . . . . . . . . . . . . . . . . .29

Company              . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Compensating Interest. . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Cooperative          . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Cooperative Apartment. . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Cooperative Lease    . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Cooperative Loans    . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Cooperative Stock    . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Cooperative Stock Certificate. . . . . . . . . . . . . . . . . . . . . . . .30

Corporate Trust Office . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Curtailment          . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Curtailment Shortfall. . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Custodial Account for P&I. . . . . . . . . . . . . . . . . . . . . . . . . .30

Custodial Account for Reserves . . . . . . . . . . . . . . . . . . . . . . .31


                                         -v-
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                                  TABLE OF CONTENTS
                                     (CONTINUED)

<CAPTION>
                                                                           PAGE
<S>                                                                        <C>
Custodial Agreement  . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Custodian            . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Cut-Off Date         . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Definitive Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . .31

Depositary Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Destroyed Mortgage Note. . . . . . . . . . . . . . . . . . . . . . . . . . .32

Determination Date   . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Disqualified Organization. . . . . . . . . . . . . . . . . . . . . . . . . .32

Distribution Date    . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

DTC                  . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

DTC Participant      . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Due Date             . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Eligible Institution . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Eligible Investments . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

ERISA                . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Event of Default     . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Excess Liquidation Proceeds. . . . . . . . . . . . . . . . . . . . . . . . .34

FDIC                 . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

FHA                  . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

FHLB                 . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

FHLMC                . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Fitch                . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

FNMA                 . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Fraud Coverage Initial Amount. . . . . . . . . . . . . . . . . . . . . . . .34

Fraud Loss           . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Group C-B Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Group C-B Loan Group Component Balance . . . . . . . . . . . . . . . . . . .34

Group C-B Percentage . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Group C-B Subordinate Liquidation Amount . . . . . . . . . . . . . . . . . .35

Group C-B Subordinate Principal Distribution Amount. . . . . . . . . . . . .35

Group I Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . .36


                                         -vi-
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<CAPTION>
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<S>                                                                        <C>
Group I Loans        . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Group I Premium Rate Mortgage Loans. . . . . . . . . . . . . . . . . . . . .36

Group I Senior Liquidation Amount. . . . . . . . . . . . . . . . . . . . . .36

Group I Senior Percentage. . . . . . . . . . . . . . . . . . . . . . . . . .36

Group I Senior Prepayment Percentage, Group II Senior Prepayment
     Percentage or Group IV Senior Prepayment Percentage . . . . . . . . . .36

Group I Senior Principal Distribution Amount . . . . . . . . . . . . . . . .39

Group I Subordinate Percentage . . . . . . . . . . . . . . . . . . . . . . .39

Group I Subordinate Prepayment Percentage. . . . . . . . . . . . . . . . . .39

Group I Subordinate Principal Prepayments Distribution Amount. . . . . . . .39

Group II Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Group II Premium Rate Mortgage Loans . . . . . . . . . . . . . . . . . . . .39

Group II Loans       . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Group II Senior Liquidation Amount . . . . . . . . . . . . . . . . . . . . .39

Group II Senior Percentage . . . . . . . . . . . . . . . . . . . . . . . . .40

Group II Senior Principal Distribution Amount. . . . . . . . . . . . . . . .40

Group II Subordinate Percentage. . . . . . . . . . . . . . . . . . . . . . .40

Group II Subordinate Prepayment Percentage . . . . . . . . . . . . . . . . .40

Group II Subordinate Principal Prepayments Distribution Amount . . . . . . .40

Group III Adjusted Lockout Percentage. . . . . . . . . . . . . . . . . . . .40

Group III Bankruptcy Coverage. . . . . . . . . . . . . . . . . . . . . . . .40

Group III Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Group III-A Certificates . . . . . . . . . . . . . . . . . . . . . . . . . .40

Group III-B Certificates . . . . . . . . . . . . . . . . . . . . . . . . . .41

Group III-X Certificates . . . . . . . . . . . . . . . . . . . . . . . . . .41

Group III-X-L Regular Interests. . . . . . . . . . . . . . . . . . . . . . .41

Group III Credit Support Depletion Date. . . . . . . . . . . . . . . . . . .41

Group III Fraud Coverage . . . . . . . . . . . . . . . . . . . . . . . . . .41

Group III Loans      . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Group III Lockout Liquidation Amount . . . . . . . . . . . . . . . . . . . .41

Group III Lockout Percentage . . . . . . . . . . . . . . . . . . . . . . . .41


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Group III Lockout Prepayment Percentage. . . . . . . . . . . . . . . . . . .42

Group III Lockout Principal Distribution Amount. . . . . . . . . . . . . . .42

Group III Senior Certificates. . . . . . . . . . . . . . . . . . . . . . . .42

Group III Senior Liquidation Amount. . . . . . . . . . . . . . . . . . . . .42

Group III Senior Percentage. . . . . . . . . . . . . . . . . . . . . . . . .42

Group III Senior Prepayment Percentage . . . . . . . . . . . . . . . . . . .42

Group III Senior Principal Distribution Amount . . . . . . . . . . . . . . .43

Group III Special Hazard Coverage. . . . . . . . . . . . . . . . . . . . . .44

Group III Subordinate Liquidation Amount . . . . . . . . . . . . . . . . . .44

Group III Subordinate Percentage . . . . . . . . . . . . . . . . . . . . . .44

Group III Subordinate Prepayment Percentage. . . . . . . . . . . . . . . . .44

Group III Subordinate Principal Distribution Amount. . . . . . . . . . . . .44

Group III Subordinate Principal Prepayments Distribution Amount. . . . . . .45

Group IV Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Group IV-A Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . .45

Group IV Loans       . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Group IV Premium Rate Mortgage Loans . . . . . . . . . . . . . . . . . . . .45

Group IV Senior Liquidation Amount . . . . . . . . . . . . . . . . . . . . .45

Group IV Senior Percentage . . . . . . . . . . . . . . . . . . . . . . . . .45

Group IV Senior Principal Distribution Amount. . . . . . . . . . . . . . . .45

Group IV Subordinate Percentage. . . . . . . . . . . . . . . . . . . . . . .45

Group IV Subordinate Prepayment Percentage . . . . . . . . . . . . . . . . .46

Group IV Subordinate Principal Prepayments Distribution Amount . . . . . . .46

Indirect DTC Participants. . . . . . . . . . . . . . . . . . . . . . . . . .46

Insurance Proceeds   . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Interest Distribution Amount . . . . . . . . . . . . . . . . . . . . . . . .46

Investment Account   . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Investment Depository. . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Junior Subordinate Certificate . . . . . . . . . . . . . . . . . . . . . . .47

Lender               . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Liquidated Mortgage Loan . . . . . . . . . . . . . . . . . . . . . . . . . .47


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Liquidation Principal. . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Liquidation Proceeds . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Loan Group           . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Loan Group I         . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Loan Group II        . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Loan Group III       . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Loan Group IV        . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Loan-to-Value Ratio  . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Lockout Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Master Servicer      . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Master Servicing Fee . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Monthly P&I Advance  . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Monthly Payment      . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Mortgage             . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Mortgaged Property   . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Mortgage File        . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Mortgage Interest Rate . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Mortgage Loan Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Mortgage Loans       . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Mortgage Note        . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Mortgage Pool        . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Mortgagor            . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Nonrecoverable Advance . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Non-U.S. Person      . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

OTS                  . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Officer's Certificate. . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Opinion of Counsel   . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Original Value       . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Ownership Interest   . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Pass-Through Entity  . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Pass-Through Rate    . . . . . . . . . . . . . . . . . . . . . . . . . . . .52


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Paying Agent         . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Payoff               . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Payoff Earnings      . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Payoff Interest      . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Payoff Period        . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Percentage Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Permitted Transferee . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Person               . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Planned Principal Balance. . . . . . . . . . . . . . . . . . . . . . . . . .54

Prepaid Monthly Payment. . . . . . . . . . . . . . . . . . . . . . . . . . .54

Primary Insurance Policy . . . . . . . . . . . . . . . . . . . . . . . . . .54

Principal Balance    . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Principal Payment    . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Principal Payment Amount . . . . . . . . . . . . . . . . . . . . . . . . . .54

Principal Prepayment . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Principal Prepayment Amount. . . . . . . . . . . . . . . . . . . . . . . . .55

Prior Period         . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Pro Rata Allocation  . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Purchase Obligation  . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Purchase Price       . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Qualified Insurer    . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Rating Agency        . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Ratings              . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Realized Loss        . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Record Date          . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

Regular Interests    . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

REMIC                . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

REMIC Provisions     . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

REMIC I              . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

REMIC I Available Distribution Amount. . . . . . . . . . . . . . . . . . . .59

REMIC I Distribution Amount. . . . . . . . . . . . . . . . . . . . . . . . .60


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REMIC I Regular Interest . . . . . . . . . . . . . . . . . . . . . . . . . .63

REMIC I Trust Fund   . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

REMIC II             . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

REMIC II Available Distribution Amount . . . . . . . . . . . . . . . . . . .64

REMIC II Distribution Amount . . . . . . . . . . . . . . . . . . . . . . . .64

REMIC II Trust Fund  . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

Remittance Rate      . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

Residual Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . . .83

Residual Distribution Amount . . . . . . . . . . . . . . . . . . . . . . . .83

Responsible Officer  . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

S&P                  . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

Securities Act       . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Security Agreement   . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Selling and Servicing Contract . . . . . . . . . . . . . . . . . . . . . . .84

Senior Certificates  . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Senior Subordinate Certificates. . . . . . . . . . . . . . . . . . . . . . .84

Senior Overcollateralized Amount . . . . . . . . . . . . . . . . . . . . . .84

Servicer             . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Servicing Fee        . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Servicing Officer    . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Special Hazard Coverage Initial Amount . . . . . . . . . . . . . . . . . . .84

Special Hazard Loss  . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Step Down Percentage . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Stripped Interest Rate . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Subgroup             . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Subgroup II-1 Loan   . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Subgroup II-1 Premium Rate Mortgage Loans. . . . . . . . . . . . . . . . . .85

Subgroup II-2 Loan   . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Subgroup II-2 Premium Rate Mortgage Loans. . . . . . . . . . . . . . . . . .86

Subgroup III-1 Loan  . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Subgroup III-2 Loan  . . . . . . . . . . . . . . . . . . . . . . . . . . . .86


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Subordinate Certificates . . . . . . . . . . . . . . . . . . . . . . . . . .86

Subordination Level  . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Substitute Mortgage Loan . . . . . . . . . . . . . . . . . . . . . . . . . .86

Targeted Principal Balance . . . . . . . . . . . . . . . . . . . . . . . . .86

Tax Matters Person   . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Termination Date     . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Termination Payment  . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Transfer             . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Transferee           . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Transferee Affidavit and Agreement . . . . . . . . . . . . . . . . . . . . .87

Trustee              . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Uncollected Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Uncompensated Interest Shortfall . . . . . . . . . . . . . . . . . . . . . .87

Undercollateralized Amount . . . . . . . . . . . . . . . . . . . . . . . . .88

Underwriting Standards . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Uninsured Cause      . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

U.S. Person          . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

VA                   . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Withdrawal Date      . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

ARTICLE II          Conveyance of the Trust Funds; REMIC Election and
                    Designations; Original Issuance of Certificates. . . . .88

     Section 2.01.  Conveyance of REMIC I; REMIC Election and Designations .89

     Section 2.02.  Acceptance by Trustee. . . . . . . . . . . . . . . . . .93

     Section 2.03.  Representations and Warranties of the Company Concerning
                    the Mortgage Loans . . . . . . . . . . . . . . . . . . .95

     Section 2.04.  Acknowledgment of Transfer of REMIC I Trust Fund;
                    Authentication of the Class R-1 Certificates . . . . . 100

     Section 2.05.  Conveyance of REMIC II; REMIC Election and Designations100

     Section 2.06.  Acceptance by Trustee; Authentication of Certificates. 103

ARTICLE III         Administration and Servicing of Mortgage Loans . . . . 103

     Section 3.01.  The Company to Act as Master Servicer. . . . . . . . . 103

     Section 3.02.  Custodial Accounts . . . . . . . . . . . . . . . . . . 105


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     Section 3.03.  The Investment Account; Eligible Investments . . . . . 106

     Section 3.04.  The Certificate Account. . . . . . . . . . . . . . . . 107

     Section 3.05.  Permitted Withdrawals from the Certificate Account,
                    the Investment Account and Custodial Accounts for
                    P&I and of Buydown Funds from the Buydown Fund
                    Accounts . . . . . . . . . . . . . . . . . . . . . . . 107

     Section 3.06.  Maintenance of Primary Insurance Policies; Collections
                     Thereunder. . . . . . . . . . . . . . . . . . . . . . 109

     Section 3.07.  Maintenance of Hazard Insurance. . . . . . . . . . . . 109

     Section 3.08.  Enforcement of Due-on-Sale Clauses; Assumption Agreements. .110

     Section 3.09.  Realization Upon Defaulted Mortgage Loans. . . . . . . 110

     Section 3.10.  Trustee to Cooperate; Release of Mortgage Files. . . . 112

     Section 3.11.  Compensation to the Master Servicer and the Servicers. 113

     Section 3.12.  Reports to the Trustee; Certificate Account Statement. 113

     Section 3.13.  Annual Statement as to Compliance. . . . . . . . . . . 113

     Section 3.14.  Access to Certain Documentation and Information
                    Regarding the Mortgage Loans . . . . . . . . . . . . . 114

     Section 3.15.  Annual Independent Public Accountants' Servicing Report114

     Section 3.16.  [Reserved] . . . . . . . . . . . . . . . . . . . . . . 114

     Section 3.17.  [Reserved.]. . . . . . . . . . . . . . . . . . . . . . 114

     Section 3.18.  [Reserved.]. . . . . . . . . . . . . . . . . . . . . . 114

     Section 3.19.  [Reserved.]. . . . . . . . . . . . . . . . . . . . . . 114

     Section 3.20.  Assumption or Termination of Selling and Servicing
                    Contracts by Trustee . . . . . . . . . . . . . . . . . 114

ARTICLE IV          Payments to Certificateholders; Payment of Expenses. . 115

     Section 4.01.  Distributions to Holders of REMIC I Regular Interests
                    and Class R-1 Certificateholders . . . . . . . . . . . 115

     Section 4.02.  Advances by the Master Servicer; Distribution Reports
                    to the Trustee . . . . . . . . . . . . . . . . . . . . 115

     Section 4.03.  Nonrecoverable Advances. . . . . . . . . . . . . . . . 117

     Section 4.04.  Distributions to Certificateholders (other than
                    Class R-1 Certificateholders). . . . . . . . . . . . . 117

     Section 4.05.  Statements to Certificateholders . . . . . . . . . . . 118

ARTICLE V           The Certificates . . . . . . . . . . . . . . . . . . . 119

     Section 5.01.  The Certificates . . . . . . . . . . . . . . . . . . . 119


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     Section 5.02.  Certificates Issuable in Classes; Distributions of
                    Principal and Interest; Authorized Denominations . . . 124

     Section 5.03.  Registration of Transfer and Exchange of Certificates. 125

     Section 5.04.  Mutilated, Destroyed, Lost or Stolen Certificates. . . 125

     Section 5.05.  Persons Deemed Owners. . . . . . . . . . . . . . . . . 126

     Section 5.06.  Temporary Certificates . . . . . . . . . . . . . . . . 126

     Section 5.07.  Book-Entry for Book-Entry Certificates . . . . . . . . 126

     Section 5.08.  Notices to Clearing Agency . . . . . . . . . . . . . . 127

     Section 5.09.  Definitive Certificates. . . . . . . . . . . . . . . . 127

     Section 5.10.  Office for Transfer of Certificates. . . . . . . . . . 128

ARTICLE VI          The Company and the Master Servicer. . . . . . . . . . 128

     Section 6.01.  Liability of the Company and the Master Servicer . . . 128

     Section 6.02.  Merger or Consolidation of the Company, or the
                    Master Servicer. . . . . . . . . . . . . . . . . . . . 128

     Section 6.03.  Limitation on Liability of the Company, the Master
                    Servicer and Others. . . . . . . . . . . . . . . . . . 128

     Section 6.04.  The Company and the Master Servicer not to Resign. . . 129

ARTICLE VII         Default. . . . . . . . . . . . . . . . . . . . . . . . 129

     Section 7.01.  Events of Default. . . . . . . . . . . . . . . . . . . 129

     Section 7.02.  Trustee to Act; Appointment of Successor . . . . . . . 132

     Section 7.03.  Notification to Certificateholders . . . . . . . . . . 133

ARTICLE VIII        Concerning the Trustee . . . . . . . . . . . . . . . . 133

     Section 8.01.  Duties of Trustee. . . . . . . . . . . . . . . . . . . 133

     Section 8.02.  Certain Matters Affecting the Trustee. . . . . . . . . 134

     Section 8.03.  Trustee Not Liable for Certificates or Mortgage Loans. 135

     Section 8.04.  Trustee May Own Certificates . . . . . . . . . . . . . 135

     Section 8.05.  The Master Servicer to Pay Trustee's Fees and Expenses 135

     Section 8.06.  Eligibility Requirements for Trustee . . . . . . . . . 136

     Section 8.07.  Resignation and Removal of Trustee . . . . . . . . . . 136

     Section 8.08.  Successor Trustee. . . . . . . . . . . . . . . . . . . 137

     Section 8.09.  Merger or Consolidation of Trustee . . . . . . . . . . 137

     Section 8.10.  Appointment of Co-Trustee or Separate Trustee. . . . . 137

     Section 8.11.  Authenticating Agents. . . . . . . . . . . . . . . . . 138


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     Section 8.12.  Paying Agents. . . . . . . . . . . . . . . . . . . . . 139

ARTICLE IX          Termination. . . . . . . . . . . . . . . . . . . . . . 140

     Section 9.01.  Termination Upon Repurchase by the Company or
                    Liquidation of All Mortgage Loans. . . . . . . . . . . 140

     Section 9.02.  Additional Termination Requirements. . . . . . . . . . 141

     Section 9.03.  Trusts Irrevocable . . . . . . . . . . . . . . . . . . 142

ARTICLE X           Miscellaneous Provisions . . . . . . . . . . . . . . . 143

     Section 10.01. Amendment. . . . . . . . . . . . . . . . . . . . . . . 143

     Section 10.02. Recordation of Agreement . . . . . . . . . . . . . . . 144

     Section 10.03. Limitation on Rights of Certificateholders . . . . . . 144

     Section 10.04. Access to List of Certificateholders . . . . . . . . . 145

     Section 10.05. Governing Law. . . . . . . . . . . . . . . . . . . . . 145

     Section 10.06. Notices. . . . . . . . . . . . . . . . . . . . . . . . 145

     Section 10.07. Severability of Provisions . . . . . . . . . . . . . . 146

     Section 10.08. Counterpart Signatures . . . . . . . . . . . . . . . . 146

     Section 10.09. Benefits of Agreement. . . . . . . . . . . . . . . . . 146

     Section 10.10. Notices and Copies to Rating Agencies. . . . . . . . . 146

</TABLE>

Exhibit A Form of Certificates

Exhibit B Form of Class R-2 Certificates
Exhibit C Form of Class R-1 Certificates
Exhibit D Mortgage Loan Schedule
Exhibit E Selling And Servicing Contract
Exhibit F Form Of Transferor Certificate For Junior Subordinate Certificates
Exhibit G Form Of Transferee's Agreement For Junior Subordinate Certificates
Exhibit H Form Of Additional Matter Incorporated Into The Certificates
Exhibit I Transferor Certificate
Exhibit J Transferee Affidavit And Agreement
Exhibit K Reserved
Exhibit L Form of Investment Letter
Exhibit M Form of Trustee's Certification Pursuant to Section 2.02


                                         -xv-
<PAGE>

     This Pooling and Servicing Agreement, dated and effective as of April 1,
1998 (this "Agreement"), is executed by and between PNC Mortgage Securities
Corp., as Depositor and Master Servicer (the "Company") and U.S. Bank National
Association, as Trustee (the "Trustee"). Capitalized terms used in this
Agreement and not otherwise defined have the meanings ascribed to such terms in
Article I hereof.

                               PRELIMINARY STATEMENT

     The Company at the Closing Date is the owner of the Mortgage Loans and the
other property being conveyed by it to the Trustee for inclusion in REMIC I. On
the Closing Date, the Company will acquire the REMIC I Regular Interests and the
Class R-1 Certificates from REMIC I as consideration for its transfer to REMIC I
of the Mortgage Loans and certain other assets and will be the owner of the
REMIC I Regular Interests and the Class R-1 Certificates. Thereafter on the
Closing Date, the Company will acquire the Certificates (other than the Class
R-1 Certificates) from REMIC II as consideration for its transfer to REMIC II of
the REMIC I Regular Interests and will be the owner of the Certificates.  The
Company has duly authorized the execution and delivery of this Agreement to
provide for (i) the conveyance to the Trustee of the Mortgage Loans and the
issuance to the Company of the REMIC I Regular Interests and the Class R-1
Certificates representing in the aggregate the entire beneficial ownership of
REMIC I and (ii) the conveyance to the Trustee by the Company of the REMIC I
Regular Interests and the issuance of the Certificates (other than the Class R-1
Certificates) representing in the aggregate the entire beneficial interest of
REMIC II. All covenants and agreements made by the Company and the Trustee
herein with respect to the Mortgage Loans and the other property constituting
the assets of REMIC I are for the benefit of the Holders from time to time of
the REMIC I Regular Interests and the Class R-1 Certificates. All covenants and
agreements made by the Company and the Trustee herein with respect to the REMIC
I Regular Interests are for the benefit of the Holders from time to time of the
Certificates (other than the Class R-1 Certificates). The Company is entering
into this Agreement, and the Trustee is accepting the two separate trusts
created hereby, for good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged.

     The Certificates issued hereunder, other than the Junior Subordinate
Certificates, have been offered for sale pursuant to a Prospectus, dated
November 24, 1997, and a Prospectus Supplement, dated April 27, 1998, of the
Company (together, the "Prospectus"). The Junior Subordinate Certificates have
been offered for sale pursuant to a Private Placement Memorandum, dated April
29, 1998.  The REMIC I Trust Fund and the REMIC II Trust Fund created hereunder
are collectively intended to be the "Trust" described in the Prospectus and the
Private Placement Memorandum and the Certificates are intended to be the
"Certificates" described therein. The following tables set forth the
designation, type of interest, initial Remittance Rate, initial Class Principal
Balance, initial Class Notional Amount, initial Component Principal Balance and
last scheduled Distribution Date for the REMIC I Regular Interests and the Class
R-1 Certificates and each Class of Certificates comprising the interests in
REMIC II created hereunder:


                                          1
<PAGE>

                                 REMIC I TRUST FUND
<TABLE>
<CAPTION>

  Class Designation
  for each REMIC I
  Regular Interest                            Initial Class     Last Scheduled
  and the Class R-1    Type of   Remittance     Principal        Distribution
   Certificates       Interest   Rate (1)       Balance            Date*
- -------------------   --------   ----------  ---------------    --------------
<S>                   <C>        <C>         <C>                <C>
 Class Y-1-L          Regular     7.000%          $27,649.42      May, 2028
 Class Y-2-L          Regular     6.750%           50,900.06      May, 2028
 Class Y-3-L          Regular     7.000%           24,724.80      May, 2028
 Class Y-4-L          Regular     6.750%           45,516.10      May, 2028
 Class Z-1-L          Regular     7.000%       90,781,289.77      May, 2028
 Class Z-2-L          Regular     6.750%      101,749,228.29      May, 2028
 Class Z-3-L          Regular     7.000%       49,424,868.67      May, 2028
 Class Z-4-L          Regular     6.750%      161,086,673.87      May, 2028
 Class W-L            Regular     6.750%      417,574,757.73      May, 2028
 Class I-X-L          Regular     7.000% (2)   ------------       May, 2028
 Class II-X-L         Regular     6.750% (2)   ------------       May, 2028
 Class III-X-1-L      Regular     6.750% (2)   ------------       May, 2028
 Class III-X-2-L      Regular     6.750% (2)   ------------       May, 2028
 Class IV-X-L         Regular     6.750% (2)   ------------       May, 2028
 Class I-P-L          Regular     (3)             414,133.19      May, 2028
 Class II-P-L         Regular     (3)             681,891.56      May, 2028
 Class III-P-L        Regular     (3)             641,286.61      May, 2028
 Class IV-P-L         Regular     (3)             363,980.35      May, 2028
 Class R-1+           Residual                         50.00      May, 2028
</TABLE>

 *    The Distribution Date in the month after the maturity date for the latest
      maturing Mortgage Loan in the related Loan Group (or Loan Groups, as
      applicable).
 +    The Class R-1 Certificates are entitled to receive the applicable
      Residual Distribution Amount and the Excess Liquidation Proceeds.
 (1)  Interest distributed to the REMIC I Regular Interests (other than the
      Class P-L Regular Interests, which shall not be entitled to receive any
      distributions of interest) and the Class R-1 Certificates on each
      Distribution Date will have accrued at the applicable per annum
      Remittance Rate on the Class Principal Balance outstanding following the
      immediately prior Distribution Date (or with respect to the first
      Distribution Date, as of the Closing Date).
 (2)  Each Class of the Class X-L Regular Interests will accrue interest on the
      related Class Notional Amount.  The Class X-L Regular Interests will not
      be entitled to receive any distributions of principal.
 (3)  The Class P-L Regular Interests will not be entitled to receive any
      distributions of interest.

     As provided herein, with respect to REMIC I, the Company will cause an
election to be made on behalf of REMIC I to be treated for federal income tax
purposes as a REMIC. The REMIC I Regular Interests will be designated regular
interests in REMIC I and the Class R-1 Certificates will be designated the sole
class of residual interest in REMIC I, for purposes of the REMIC Provisions.

                                 REMIC I TRUST FUND
<TABLE>
<CAPTION>

  Class Designation
  for each REMIC I
  Regular Interest                              Initial Class    Last Scheduled
  and the Class R-1    Type of   Remittance       Principal      Distribution
   Certificates       Interest   Rate (1)         Balance            Date*
- -------------------   --------   -----------    --------------   --------------
<S>                   <C>
 Class I-A-1          Regular     7.000%          $90,394,806.00    May, 2028


                                          2
<PAGE>

 Class II-A-1         Regular     Variable (2)    196,321,485.00    May, 2028
 Class III-A-1        Regular     6.750%          143,196,000.00    May, 2028
 Class III-A-2        Regular     6.750%           22,785,000.00    May, 2028
 Class III-A-3        Regular     6.750%            9,000,000.00    May, 2028
 Class III-A-4        Regular     6.750%           15,900,000.00    May, 2028
 Class III-A-5        Regular     6.750%            6,299,000.00    May, 2028
 Class III-A-6        Regular     6.750%           28,000,000.00    May, 2028
 Class III-A-7        Regular     6.750%           10,860,007.00    May, 2028
 Class III-A-8        Regular     6.750% (3)       33,633,000.00    May, 2028
 Class III-A-9        Regular     7.000%           49,773,536.00    May, 2028
 Class III-A-10       Regular     (4)               2,999,777.00    May, 2028
 Class III-A-11       Regular     6.750% (5)        3,580,000.00    May, 2028
 Class III-A-12       Regular     6.750%           23,000,000.00    May, 2028
 Class III-A-13       Regular     6.750%           15,740,000.00    May, 2028
 Class III-A-14       Regular     6.750%           10,499,000.00    May, 2028
 Class III-A-15       Regular     7.250%           12,985,715.00    May, 2028
 Class III-A-16       Regular     6.750% (6)        3,755,000.00    May, 2028
 Class III-A-17       Regular     6.750% (7)        1,500,000.00    May, 2028
 Class III-A-18       Regular     7.000%            5,249,000.00    May, 2028
 Class IV-A-1         Regular     6.500%           50,718,024.00    May, 2028
 Class IV-A-2         Regular     7.000%           50,718,024.00    May, 2028
 Class I-X            Regular     7.000% (8)        ----------      May, 2028
 Class II-X           Regular     6.750% (8)        ----------      May, 2028
 Class III-X-1        Regular     6.750% (8)        ----------      May, 2028
 Class III-X-2        Regular     6.750% (8)        ----------      May, 2028
 Class IV-X           Regular     6.750% (8)        ----------      May, 2028
 Class I-P            Regular     (9)                 414,133.19    May, 2028
 Class II-P           Regular     (9)                 681,891.56    May, 2028
 Class III-P          Regular     (9)                 641,286.61    May, 2028
 Class IV-P           Regular     (9)                 363,980.35    May, 2028
 Class C-B-1          Regular     Variable (10)    13,161,171.00    May, 2028
 Class C-B-2          Regular     Variable (10)     5,222,686.00    May, 2028
 Class C-B-3          Regular     Variable (10)     4,178,149.00    May, 2028
 Class C-B-4          Regular     Variable (10)     2,715,797.00    May, 2028
 Class C-B-5          Regular     Variable (10)     1,044,537.00    May, 2028
 Class C-B-6          Regular     Variable (10)     1,880,172.19    May, 2028
 Class III-B-1        Regular     6.750%            8,364,320.00    May, 2028
 Class III-B-2        Regular     6.750%            3,763,944.00    May, 2028
 Class III-B-3        Regular     6.750%            2,927,512.00    May, 2028
 Class III-B-4        Regular     6.750%            1,672,864.00    May, 2028
 Class III-B-5        Regular     6.750%            1,045,540.00    May, 2028
 Class III-B-6        Regular     6.750%            1,045,542.73    May, 2028
 Class R-2+           Residual    6.750%                   50.00    May, 2028
</TABLE>

*    The Distribution Date in the month after the maturity date for the latest
     maturing Mortgage Loan in the related Loan Group.
+    The Class R-2 Certificates are entitled to receive the applicable Residual
     Distribution Amount.
(1)  Interest distributed to the Certificates (other than the Class III-A-10 and
     Class P Certificates, which shall not be entitled to receive any
     distributions of interest) on each Distribution Date will have accrued at
     the applicable per annum Remittance Rate on the Class Principal Balance or
     Class Notional Amount outstanding following the immediately prior
     Distribution Date (or with respect to the first Distribution Date, as of
     the Closing Date).
(2)  The Remittance Rate on the Class II-A-1 Certificates shall equal, on any
     Distribution Date, the average of the Remittance Rates on the Class Y-3-L,
     Class Y-4-L, Class Z-3-L and Class Z-4-L Regular Interests, with such
     average weighted on the basis of their respective Class Principal Balances.


                                          3
<PAGE>

(3)  For purposes of calculating distributions, the Class III-A-8 Certificates
     will be comprised of two Components having the designations, initial
     Component Principal Balances and Remittance Rates set forth below.  Each of
     the Components listed here will be a regular interest in REMIC II.

<TABLE>
<CAPTION>

                              INITIAL COMPONENT
          DESIGNATION         PRINCIPAL BALANCE     REMITTANCE RATE
          -----------         -----------------     ---------------
     <S>                      <C>                   <C>
     Component III-A-8-1      $25,858,000.00           6.750%
     Component III-A-8-2      $ 7,775,000.00           6.750%
</TABLE>

(4)  For purposes of calculating distributions, the Class III-A-10 Certificates
     will be comprised of two Components having the designations, initial
     Component Principal Balances and Remittance Rates set forth below. Each of
     the Components listed here will be a regular interest in REMIC II.

<TABLE>
<CAPTION>

                              INITIAL COMPONENT
          DESIGNATION         PRINCIPAL BALANCE     REMITTANCE RATE
          -----------         -----------------     ---------------
     <S>                      <C>                   <C>
     Component III-A-10-1     $1,843,464.00             (1)
     Component III-A-10-2     $1,156,313.00             (1)
</TABLE>

          (1)  Neither Component III-A-10-1 nor Component III-A-10-2 will be
          entitled to receive any distributions of interest.

(5)  On each Distribution Date on or before the Class III-A-11 Accretion
     Termination Date, an amount equal to the Class III-A-11 Accrual Amount will
     be added to the Class III-A-11 Principal Balance, and such amount will be
     distributed as principal to certain Classes or Components of Group III-A
     Certificates as set forth herein and will not be distributed as interest to
     the Class III-A-11 Certificates.
(6)  On each Distribution Date on or before the Class III-A-16 Accretion
     Termination Date, an amount equal to the Class III-A-16 Accrual Amount will
     be added to the Class III-A-16 Principal Balance, and such amount will be
     distributed as principal to certain Classes of Group III-A Certificates as
     set forth herein and will not be distributed as interest to the Class
     III-A-16 Certificates.
(7)  On each Distribution Date on or before the Class III-A-17 Accretion
     Termination Date, an amount equal to the Class III-A-17 Accrual Amount
     will be added to the Class III-A-17 Principal Balance, and such amount
     will be distributed as principal to certain Classes or Components of
     Group III-A Certificates as set forth herein and will not be
     distributed as interest to the Class III-A-17 Certificates.
(8)  Each Class of the Class X Certificates will accrue interest on the
     related Class Notional Amount.  The Class X Certificates will not be
     entitled to receive any distributions of principal.
(9)  The Class P Certificates will not be entitled to receive any
     distributions of interest.
(10) The Remittance Rate on the Group C-B Certificates shall equal, on any
     Distribution Date, the average of the Remittance Rates on the Class
     Y-1-L, Class Y-2-L, Class Y-3-L and Class Y-4-L Regular Interests,
     with such average weighted on the basis of their respective Class
     Principal Balances.

     As provided herein, with respect to REMIC II, the Company will cause an
election to be made on behalf of REMIC II to be treated for federal income tax
purposes as a REMIC.  The Certificates (other than the Class III-A-8, Class
III-A-10 and Residual Certificates) and Component III-A-8-1, Component
III-A-8-2, Component III-A-10-1 and Component III-A-10-2 will be designated
regular interests in REMIC II and the Class R-2 Certificates will be designated
the sole class of residual interest in REMIC II, for purposes of the REMIC
Provisions. As of the Cut-Off Date, the Mortgage Loans have an aggregate
Principal Balance of $836,031,000.63 and the Certificates have an Aggregate
Certificate Principal Balance of $836,031,000.63.



                               W I T N E S S E T H :


                                         4
<PAGE>

     WHEREAS, the Company is a corporation duly organized and existing under and
by virtue of the laws of the State of Delaware and has full corporate power and
authority to enter into this Agreement and to undertake the obligations
undertaken by it herein;

     WHEREAS, the Company is the owner of the Mortgage Loans identified in the
Mortgage Loan Schedule hereto having unpaid Principal Balances on the Cut-Off
Date as stated therein;

     WHEREAS, the Company has been duly authorized to (i) create a trust ("REMIC
I") to hold the Mortgage Loans and certain other property and (ii) sell
undivided beneficial ownership interests in REMIC I and in order to do so is
selling the REMIC I Regular Interests and the Class R-1 Certificates issued
hereunder as hereinafter provided;

     WHEREAS, the Company has been duly authorized to (i) create a trust ("REMIC
II") to hold the REMIC I Regular Interests and (ii) sell undivided beneficial
ownership interests in REMIC II and in order to do so is selling the
Certificates issued hereunder as hereinafter provided;

     WHEREAS, the Trustee is a national banking association duly organized and
existing under the laws of the United States and has full power and authority to
enter into this Agreement.

     NOW, THEREFORE, in order to declare the terms and conditions upon which the
Certificates are, and are to be, authenticated, issued and delivered, and in
consideration of the premises and of the purchase and acceptance of the
Certificates by the Holders thereof, the Company covenants and agrees with the
Trustee, for the equal and proportionate benefit of the respective Holders from
time to time of the Certificates, as follows:

                                      ARTICLE I


     Section 1.01.  Definitions.

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

     ACCRETION DIRECTED CLASSES:  The Class III-A-1, Class III-A-9, Class
III-A-11, Class III-A-15, Class III-A-16, Class III-A-17 and Class III-A-18
Certificates.

     ACCRETION DIRECTED COMPONENTS:  Component III-A-10-1 and Component
III-A-10-2.

     AGGREGATE CERTIFICATE PRINCIPAL BALANCE: At any given time, the sum of the
then current Class Principal Balances of the Certificates.

     APPRAISED VALUE: The amount set forth in an appraisal made by or for the
mortgage originator in connection with its origination of each Mortgage Loan.


                                          5
<PAGE>

     ASSIGNMENT OF PROPRIETARY LEASE: With respect to a Cooperative Loan, the
assignment or mortgage of the related Cooperative Lease from the Mortgagor to
the originator of the Cooperative Loan.

     AUTHENTICATING AGENT: Any authenticating agent appointed by the Trustee
pursuant to Section 8.11.

     AUTHORIZED DENOMINATION: With respect to the Certificates (other than the
Class III-A-3, Class X and Residual Certificates), an initial Certificate
Principal Balance equal to $25,000 and integral multiples of $1 in excess
thereof, except one Certificate of each Class of Class P Certificates may be
issued in a different amount. With respect to the Class III-A-3 Certificates, an
initial Certificate Principal Balance equal to $1,000 and integral multiples of
$1 in excess thereof.  With respect to the Class X Certificates, a Class
Notional Amount equal to $100,000 and multiples of $1 in excess thereof, except
that one Certificate of each  Class of Class X Certificates may be issued in a
different amount. With respect to each Class of the Residual Certificates, one
Certificate with a Percentage Interest equal to 0.01% and one Certificate with a
Percentage Interest equal to 99.99%.

     BALLOON LOAN: Any Mortgage Loan which, by its terms, does not fully
amortize the principal balance thereof by its stated maturity.

     BANKRUPTCY COVERAGE: The Combined Bankruptcy Coverage and/or the Group III
Bankruptcy Coverage, as applicable.

      BANKRUPTCY COVERAGE INITIAL AMOUNT: With respect to Loan Group I, Loan
Group II and Loan Group IV, $158,561 and with respect to Loan Group III,
$125,000.

     BANKRUPTCY LOSS: A loss on a Mortgage Loan arising out of (i) a reduction
in the scheduled Monthly Payment for such Mortgage Loan by a court of competent
jurisdiction in a case under the United States Bankruptcy Code, other than any
such reduction that arises out of clause (ii) of this definition of "Bankruptcy
Loss", including, without limitation, any such reduction that results in a
permanent forgiveness of principal, or (ii) with respect to any Mortgage Loan, a
valuation, by a court of competent jurisdiction in a case under such Bankruptcy
Code, of the related Mortgaged Property in an amount less than the then
outstanding Principal Balance of such Mortgage Loan.

     BENEFICIAL HOLDER: A Person holding a beneficial interest in any Book-Entry
Certificate as or through a DTC Participant or an Indirect DTC Participant or a
Person holding a beneficial interest in any Definitive Certificate.

     BOOK-ENTRY CERTIFICATES: The Senior Certificates (other than the Residual
Certificates), beneficial ownership and transfers of which shall be made through
book entries as described in Section 5.07.

     BUSINESS DAY: Any day other than a Saturday, a Sunday, or a day on which
banking institutions in Chicago, Illinois or New York, New York are authorized
or obligated by law or executive order to be closed.


                                          6
<PAGE>

     BUYDOWN AGREEMENT: An agreement between a Person and a Mortgagor pursuant
to which such Person has provided a Buydown Fund.

     BUYDOWN FUND: A fund provided by the originator of a Mortgage Loan or
another Person with respect to a Buydown Loan which provides an amount
sufficient to subsidize regularly scheduled principal and interest payments due
on such Buydown Loan for a period. Buydown Funds may be (i) funded at the par
values of future payment subsidies, or (ii) funded in an amount less than the
par values of future payment subsidies, and determined by discounting such par
values in accordance with interest accruing on such amounts, in which event they
will be deposited in an account bearing interest. Buydown Funds may be held in a
separate Buydown Fund Account or may be held in a Custodial Account for P&I or a
Custodial Account for Reserves and monitored by a Servicer.

     BUYDOWN FUND ACCOUNT: A separate account or accounts created and maintained
pursuant to Section 3.02 (a) with the corporate trust department of the Trustee
or another financial institution approved by the Master Servicer, (b) within
FDIC insured accounts (or other accounts with comparable insurance coverage
acceptable to the Rating Agencies) created, maintained and monitored by a
Servicer or (c) in a separate non-trust account without FDIC or other insurance
in an Eligible Institution. Such account or accounts may be non-interest bearing
or may bear interest. In the event that a Buydown Fund Account is established
pursuant to clause (b) of the preceding sentence, amounts held in such Buydown
Fund Account shall not exceed the level of deposit insurance coverage on such
account; accordingly, more than one Buydown Fund Account may be established.

     BUYDOWN LOAN: A Mortgage Loan for which the Mortgage Interest Rate has been
subsidized through a Buydown Fund provided at the time of origination of such
Mortgage Loan.

     CERTIFICATE: Any one of the Group I, Group II, Group III, Group IV or Group
C-B Certificates, issued pursuant to this Agreement, executed by the Trustee and
authenticated by or on behalf of the Trustee hereunder in substantially one of
the forms set forth in Exhibit A, B and C hereto. The additional matter
appearing in Exhibit H shall be deemed incorporated into Exhibits A and B as
though set forth at the end of such Exhibits.

     CERTIFICATE ACCOUNT: The separate trust account created and maintained with
the Trustee, the Investment Depository or any other bank or trust company
acceptable to the Rating Agencies which is incorporated under the laws of the
United States or any state thereof pursuant to Section 3.04, which account shall
bear a designation clearly indicating that the funds deposited therein are held
in trust for the benefit of the Trustee on behalf of the Certificateholders or
any other account serving a similar function acceptable to the Rating Agencies.
Funds in the Certificate Account in respect of the Mortgage Loans in each of the
Loan Groups and amounts withdrawn from the Certificate Account attributable to
each of such Loan Groups shall be accounted for separately.  Funds in the
Certificate Account may be invested in Eligible Investments and reinvestment
earnings thereon shall be paid to the Master Servicer as additional servicing
compensation. Funds deposited in the Certificate Account (exclusive of the
Master Servicing Fee) shall be held in trust for the Certificateholders and for
the uses and purposes set forth in Section 3.04, Section 3.05, Section 4.01 and
Section 4.04.


                                          7
<PAGE>

     CERTIFICATEHOLDER OR HOLDER: With respect to the Certificates, the person
in whose name a Certificate is registered in the Certificate Register, except
that, solely for the purposes of giving any consent pursuant to this Agreement,
any Certificate registered in the name of the Company, the Master Servicer or
any affiliate thereof shall be deemed not to be outstanding and the Percentage
Interest evidenced thereby shall not be taken into account in determining
whether the requisite percentage of Percentage Interests necessary to effect any
such consent has been obtained; provided, that the Trustee may conclusively rely
upon an Officer's Certificate to determine whether any Person is an affiliate of
the Company or the Master Servicer. With respect to the REMIC I Regular
Interests, the owner of the REMIC I Regular Interests, which as of the Closing
Date and at all times thereafter shall be the Trustee.

     CERTIFICATE GROUP:  Any of the Group I, Group II, Group III, Group IV or
Group C-B Certificates. For the Group I Certificates, the "related" Loan Group
is the Group I Loans. For the Group II Certificates, the "related" Loan Group is
the Group II Loans. For the Group III Certificates, the "related" Loan Group is
the Group III Loans. For the Group IV Certificates, the "related" Loan Group is
the Group IV Loans.  For the Group C-B Certificates, the "related" Loan Groups
are the Group I Loans, the Group II Loans and the Group IV Loans.

     CERTIFICATE PRINCIPAL BALANCE: For each Certificate of any Class, the
portion of the related Class Principal Balance, if any, represented by such
Certificate.

     CERTIFICATE REGISTER AND CERTIFICATE REGISTRAR: The register maintained and
the registrar appointed, respectively, pursuant to Section 5.03.

     CLASS: All REMIC I Regular Interests or the Class R-1 Certificates having
the same priority and rights to payments on the Mortgage Loans from the REMIC I
Available Distribution Amount and all Certificates (other than the Class R-1
Certificates) having the same priority and rights to payments on the REMIC I
Regular Interests from the REMIC II Available Distribution Amount, which
Certificates or REMIC I Regular Interests, as applicable, shall be designated as
a separate Class, and which, in the case of the Certificates, shall be set forth
in the applicable forms of Certificates attached hereto as Exhibits A, B and C.
Each Class of REMIC I Regular Interests and the Class R-1 Certificates shall be
entitled to receive the amounts allocated to such Class pursuant to the
definition of "REMIC I Distribution Amount" only to the extent of the REMIC I
Available Distribution Amount for such Distribution Date remaining after
distributions in accordance with prior clauses of the definition of "REMIC I
Distribution Amount", and each Class of Certificates (other than the Class R-1
Certificates) shall be entitled to receive the amounts allocated to such Class
pursuant to the definition of "REMIC II Distribution Amount" only to the extent
of the REMIC II Available Distribution Amount for such Distribution Date
remaining after distributions in accordance with prior clauses of the definition
of "REMIC II Distribution Amount."

     CLASS A CERTIFICATES: The Class I-A-1, Class II-A-1, Group III-A and Group
IV-A Certificates.

     CLASS B CERTIFICATES: The Group III-B and Group C-B Certificates.


                                          8
<PAGE>

     CLASS C-B-1 CERTIFICATES: The Certificates designated as "Class C-B-1" on
the face thereof in substantially the form attached hereto as Exhibit A-C-B-1.

     CLASS C-B-2 CERTIFICATES: The Certificates designated as "Class C-B-2" on
the face thereof in substantially the form attached hereto as Exhibit A-C-B-2.

     CLASS C-B-3 CERTIFICATES: The Certificates designated as "Class C-B-3" on
the face thereof in substantially the form attached hereto as Exhibit A-C-B-3.

     CLASS C-B-4 CERTIFICATES: The Certificates designated as "Class C-B-4" on
the face thereof in substantially the form attached hereto as Exhibit A-C-B-4.

     CLASS C-B-5 CERTIFICATES: The Certificates designated as "Class C-B-5" on
the face thereof in substantially the form attached hereto as Exhibit A-C-B-5.

     CLASS C-B-6 CERTIFICATES: The Certificates designated as "Class C-B-6" on
the face thereof in substantially the form attached hereto as Exhibit A-C-B-6.

     CLASS P CERTIFICATES: The Class I-P, Class II-P, Class III-P and Class IV-P
Certificates.

     CLASS P-L REGULAR INTERESTS: The Class I-P-L, Class II-P-L, Class III-P-L
and Class IV-P-L Regular Interests.

     CLASS P FRACTION: Either of the Class I-P, Class II-P, Class III-P or Class
IV-P Fractions, as applicable.

     CLASS P MORTGAGE LOAN: Any of the Class I-P, Class II-P, Class III-P or
Class IV-P Mortgage Loans.

     CLASS W-L REGULAR INTEREST: The uncertificated partial undivided beneficial
ownership interest in REMIC I which constitutes a REMIC I Regular Interest.  The
"related Loan Group" for the Class W-L Regular Interests is Loan Group III.

     CLASS X CERTIFICATES: The Class I-X, Class II-X, Group III-X and Class IV-X
Certificates.

     CLASS X-L REGULAR INTERESTS: The Class I-X-L, Class II-X-L, Group III-X-L
and Class IV-X-L Regular Interests.

     CLASS Y-L REGULAR INTERESTS: The Class Y-1-L, Class Y-2-L, Class Y-3-L and
Class Y-4-L Regular Interests.

     CLASS Y-1-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.  The "related Loan Group" for the Class Y-1-L Regular Interests is
Loan Group I.

     CLASS Y-1-L PRINCIPAL DISTRIBUTION AMOUNT:  For any Distribution Date, the
excess, if any, of the Class Y-1-L Principal Reduction Amount for such
Distribution Date over the principal


                                          9
<PAGE>

portion of Realized Losses allocated to the Class Y-1-L Regular Interests on
such Distribution Date.

     CLASS Y-2-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest. The "related Loan Group" for the Class Y-2-L Regular Interests is Loan
Group IV.

     CLASS Y-2-L PRINCIPAL DISTRIBUTION AMOUNT:  For any Distribution Date, the
excess, if any, of the Class Y-2-L Principal Reduction Amount for such
Distribution Date over the principal portion of Realized Losses allocated to the
Class Y-2-L Regular Interests on such Distribution Date.

     CLASS Y-3-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest. The "related Subgroup" for the Class Y-3-L Regular Interests is
Subgroup II-1.

     CLASS Y-3-L PRINCIPAL DISTRIBUTION AMOUNT:  For any Distribution Date, the
excess, if any, of the Class Y-3-L Principal Reduction Amount for such
Distribution Date over the principal portion of Realized Losses allocated to the
Class Y-3-L Regular Interests on such Distribution Date.

     CLASS Y-4-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest. The "related Subgroup" for the Class Y-4-L Regular Interests is
Subgroup II-2.

     CLASS Y-4-L PRINCIPAL DISTRIBUTION AMOUNT:  For any Distribution Date, the
excess, if any, of the Class Y-4-L Principal Reduction Amount for such
Distribution Date over the principal portion of Realized Losses allocated to the
Class Y-4-L Regular Interests on such Distribution Date.

     CLASS Y-L PRINCIPAL REDUCTION AMOUNTS:  For any Distribution Date, the
amounts by which the Class Principal Balances of the Class Y-1-L, Class Y-2-L,
Class Y-3-L and Class Y-4-L Regular Interests, respectively, will be reduced on
such Distribution Date by the allocation of Realized Losses and the distribution
of principal, determined as follows:

     For purposes of the succeeding formulas the following symbols shall have
the meanings set forth below:

PIB =     the Group C-B Loan Group Component Balance for Loan Group I.

PIIB =    the Group C-B Loan Group Component Balance for Loan Group II.

PIVB =    the Group C-B Loan Group Component Balance for Loan Group IV.

RIIB =    the Class II-A-1 Remittance Rate.


                                          10
<PAGE>

R =       the Remittance Rate on the Group C-B Certificates = (7%PIB + RIIBPIIB
          + 6.75%PIVB)/(PIB + PIIB + PIVB)

Y1 =      the principal balance of the Class Y-1-L Regular Interests after
          distributions on the prior Distribution Date.

Y2 =      the principal balance of the Class Y-2-L Regular Interests after
          distributions on the prior Distribution Date.

Y3 =      the principal balance of the Class Y-3-L Regular Interests after
          distributions on the prior Distribution Date.

Y4 =      the principal balance of the Class Y-4-L Regular Interests after
          distributions on the prior Distribution Date.

DY1 =     the Class Y-1-L Principal Reduction Amount.

DY2 =     the Class Y-2-L Principal Reduction Amount.

DY3 =     the Class Y-3-L Principal Reduction Amount.

DY4 =     the Class Y-4-L Principal Reduction Amount.

P1 =      the aggregate principal balance of the Class Y-1-L and Class Z-1-L
          Regular Interests after distributions on the prior Distribution Date.

P2 =      the aggregate principal balance of the Class Y-2-L and Class Z-2-L
          Regular Interests after distributions on the prior Distribution Date.

P3 =      the aggregate principal balance of the Class Y-3-L and Class Z-3-L
          Regular Interests after distributions on the prior Distribution Date.

P4 =      the aggregate principal balance of the Class Y-4-L and Class Z-4-L
          Regular Interests after distributions on the prior Distribution Date.

DP1 =     the aggregate of the Class Y-1-L and Class Z-1-L Principal Reduction
          Amounts.

DP2 =     the aggregate of the Class Y-2-L and Class Z-2-L Principal Reduction
          Amounts.

DP3 =     the aggregate of the Class Y-3-L and Class Z-3-L Principal Reduction
          Amounts.

DP4 =     the aggregate of the Class Y-4-L and Class Z-4-L Principal Reduction
          Amounts.

a =       .0005


                                          11
<PAGE>

g =       (R - 6.75%)/(7% - R).  g is a non-negative number unless its
          denominator is zero, in which event it is undefined.

If g is zero, DY1 = Y1, DY2 = (Y2/P2)DP2, DY3 = Y3, and DY4 = (Y4/P4)DP4.

If g is undefined, DY2 = Y2, DY1 = (Y1/P1)DP1, DY4 = Y4 and DY3 = (Y3/P3)DP3.

In the remaining situations, DY1, DY2, DY3 and DY4 shall be defined as follows:

I.   If Y1, Y2, Y3 and Y4 are all non-zero, P1 > DP1, P2 > DP2, P3 > DP3 and
     P4 > DP4:


1.   If Y1 - a(P1 - DP1) > 0, Y2- a(P2 - DP2) > 0, and g(P2 - DP2) < (P1 - DP1),
                         -                    -
     DY1 = Y1 - ag(P2 - DP2) and DY2 = Y2 - a(P2 - DP2).

2.   If Y1 - a(P1 - DP1) > 0, Y2 - a(P2 - DP2) > 0, and g(P2 - DP2) >
                         -                     -                    -
     (P1 - DP1), DY1 = Y1 - a(P1 - DP1) and DY2 = Y2 - (a/g)(P1 - DP1).

3.   If Y1 - a(P1 - DP1) < 0, Y2 - a(P2 - DP2) > 0, and Y2 - a(P2 - DP2) >
                         -                     -                         -
     Y2 - (Y1/g), DY1 = Y1 - ag(P2 - DP2) and DY2 = Y2 - a(P2 - DP2).

4.   If Y1 - a(P1 - DP1) < 0, Y2 - (Y1/g) > 0, and Y2 - a(P2 - DP2) < 
                                          -                         -
     Y2 - (Y1/g), DY1 = 0 and DY2 = Y2 - (Y1/g).

5.   If Y2 - a(P2 - DP2) < 0, Y2 - (Y1/g) < 0, and Y1 - a(P1 - DP1) < 
                                                                    -
     Y1 - (gY2), DY1 = Y1 - (gY2) and DY2 = 0.

6.   If Y2 - a(P2 - DP2) < 0, Y1 - a(P1 - DP1) > 0, and Y1 - a(P1 - DP1) >
                                               -                         -
     Y1 - (gY2), DY1 = Y1 - a(P1 - DP1) and DY2 = Y2 - (a/g)(P1 - DP1).

7.   If Y3 - a(P3 - DP3) > 0, Y4- a(P4 - DP4) > 0, and g(P4 - DP4) < (P3 - DP3),
                         -                    -
     DY3 = Y3 - ag(P4 - DP4) and DY4 = Y4 - a(P4 - DP4).

8.   If Y3 - a(P3 - DP3) > 0, Y4 - a(P4 - DP4) > 0, and g(P4 - DP4) >
                         -                     -                    -
     (P3 - DP3), DY3 = Y3 - a(P3 - DP3) and DY4 = Y4 - (a/g)(P3 - DP3).

9.   If Y3 - a(P3 - DP3) < 0, Y4 - a(P4 - DP4) > 0, and Y4 - a(P4 - DP4) >
                                               -                         -
     Y4 - (Y3/g), DY3 = Y3 - ag(P4 - DP4) and DY4 = Y4 - a(P4 - DP4).

10.  If Y3 - a(P3 - DP3) < 0, Y4 - (Y3/g) > 0, and Y4 - a(P4 - DP4) < 
                                          -                         -
     Y4 - (Y3/g), DY3 = 0 and DY4 = Y4 - (Y3/g).

11.  If Y4 - a(P4 - DP4) < 0, Y4 - (Y3/g) < 0, and Y3 - a(P3 - DP3) < 
                                                                    -
     Y3 - (gY4), DY3 = Y3 - (gY4) and DY4 = 0.


                                          12
<PAGE>

12.  If Y4 - a(P4 - DP4) < 0, Y3 - a(P3 - DP3) > 0, and Y3 - a(P3 - DP3) >
                                               -                         -
     Y3 - (gY4), DY3 = Y3 - a(P3 - DP3) and DY4 = Y4 - (a/g)(P3 - DP3).

The purpose of the foregoing definitional provisions together with the related
provisions allocating Realized Losses and defining the Class Y-L and Class Z-L
Principal Distribution Amounts is to accomplish the following goals in the
following order of priority:

     1.   Making each of (a) the ratio of the Class Y-1-L Principal Balance to
          the Class Y-2-L Principal Balance and (b) the ratio of the Class Y-3-L
          Principal Balance to the Class Y-4-L Principal Balance equal to g in
          each case after taking account of the allocation Realized Losses and
          the distributions that will be made through end of the Distribution
          Date to which such provisions relate and assuring that the Principal
          Reduction Amount for each of the Class Y-1-L, Class Y-2-L, Class
          Y-3-L, Class Y-4-L, Class Z-1-L, Class Z-2-L, Class Z-3-L and Class
          Z-4-L Regular Interests is greater than or equal to zero for such
          Distribution Date;

     2.   Making the Class Y-1-L Principal Balance less than or equal to 0.0005
          of the sum of the Class Y-1-L and Class Z-1-L Principal Balances, the
          Class Y-2-L Principal Balance less than or equal to 0.0005 of the sum
          of the Class Y-2-L and Class Z-2-L Principal Balances, the Class Y-3-L
          Principal Balance less than or equal to 0.0005 of the sum of the Class
          Y-3-L and Class Z-3-L Principal Balances and the Class Y-4-L Principal
          Balance less than or equal to 0.0005 of the sum of the Class Y-4-L and
          Class Z-4-L Principal Balances in each case after giving effect to
          allocations of Realized Losses and distributions to be made through
          the end of the Distribution Date to which such provisions relate; and

     3.   Making (I) the larger of (a) the fraction whose numerator is the Class
          Y-1-L Principal balance and whose denominator is the sum of the Class
          Y-1-L and Class Z-1-L Principal Balances and (b) the fraction whose
          numerator is the Class Y-2-L Principal balance and whose denominator
          is the sum of the Class Y-2-L and Class Z-2-L Principal Balances as
          large as possible while remaining less than or equal to 0.0005 and
          (II) the larger of (a) the fraction whose numerator is the Class Y-3-L
          Principal balance and whose denominator is the sum of the Class Y-3-L
          and Class Z-3-L Principal Balances and (b) the fraction whose
          numerator is the Class Y-4-L Principal balance and whose denominator
          is the sum of the Class Y-4-L and Class Z-4-L Principal Balances as
          large as possible while remaining less than or equal to 0.0005.

In the event of a failure of the foregoing portion of the  definition of Class
Y-L Principal Reduction Amount to accomplish both of goals 1 and 2 above, the
amounts thereof should be adjusted to so as to accomplish such goals within the
requirement that each Class Y-L Principal Reduction Amount must be less than or
equal to the sum of (a) the principal portion of Realized Losses to be allocated
on the related Distribution Date for the related Loan Group or Subgroup
remaining after the allocation of such Realized Losses to the related Class P-L
Regular Interests and (b) the remainder of the REMIC I Available Distribution
Amount for the related Loan Group or Subgroup after reduction thereof by the
distributions to be made on such Distribution Date (i)


                                          13
<PAGE>

to the related Class P-L Regular Interests, (ii) to the related Class X-L
Regular Interests and (iii) in respect of interest on the related Class Y-L and
Class Z-L Regular Interests, or, if both of such goals cannot be accomplished
within such requirement, such adjustment as is necessary shall be made to
accomplish goal 1 within such requirement.  In the event of any conflict among
the provisions of the definition of the Class Y-L Principal Reduction Amounts,
such conflict shall be resolved on the basis of the goals and their priorities
set forth above within the requirement set forth in the preceding sentence.

II.  If Y2=0 or DP2=P2:

Make the following additional definitions:

Y5 =      Y1 + Y3.

P5 =      P1 + P3.

DY5 =     DY1 + DY3.


1.   If Y5 - a(P5 - DP5) > 0, Y4- a(P4 - DP4) > 0, and g(P4 - DP4) < (P5 - DP5),
                         -                    -
     DY5 = Y5 - ag(P4 - DP4) and DY4 = Y4 - a(P4 - DP4).

2.   If Y5 - a(P5 - DP5) > 0, Y4 - a(P4 - DP4) > 0, and g(P4 - DP4) > 
                         -                     -                    -
     (P5 - DP5), DY5 = Y5 - a(P5 - DP5) and DY4 = Y4 - (a/g)(P5 - DP5).

3.   If Y5 - a(P5 - DP5) < 0, Y4 - a(P4 - DP4) > 0, and Y4 - a(P4 - DP4) >
                                               -                         -
     Y4 - (Y5/g), DY5 = Y5 - ag(P4 - DP4) and DY4 = Y4 - a(P4 - DP4).

4.   If Y5 - a(P5 - DP5) < 0, Y4 - (Y5/g) > 0, and Y4 - a(P4 - DP4) < 
                                          -                         -
     Y4 - (Y5/g), DY5 = 0 and DY4 = Y4 - (Y5/g).

5.   If Y4 - a(P4 - DP4) < 0, Y4 - (Y5/g) < 0, and Y5 - a(P5 - DP5) < 
                                                                    -
     Y5 - (gY4), DY5 = Y5 - (gY4) and DY4 = 0.

6.   If Y4 - a(P4 - DP4) < 0, Y5 - a(P5 - DP5) > 0, and Y5 - a(P5 - DP5) >
                                               -                         -
     Y5 - (gY4), DY5 = Y5 - a(P5 - DP5) and DY4 = Y4 - (a/g)(P5 - DP5).


DY1 = [Y1/(Y1 + Y3)]DY5

DY3 = [Y3/(Y1 + Y3)]DY5

DY2 = Y2.


                                          14
<PAGE>

The purpose of the foregoing definitional provisions together with the related
provisions allocating Realized Losses and defining the Class Y-L and Class Z-L
Principal Distribution Amounts is to accomplish the following goals in the
following order of priority:

1.   Making the ratio of Y5 to Y4 equal to g after taking account of the
     allocation of Realized Losses and the distributions that will be made
     through end of the Distribution Date to which such provisions relate and
     assuring that the Principal Reduction Amount for each of the Class Y-1-L,
     Class Y-2-L, Class Y-3-L, Class Y-4-L, Class Z-1-L Class Z-2-L, Class Z-3-L
     and Class Z-4-L Regular Interests is greater than or equal to zero for such
     Distribution Date;

2.   Making the Class Y-1-L Principal Balance less than or equal to 0.0005 of
     the sum of the Class Y-1-L and Class Z-1-L Principal Balances, the Class
     Y-3-L Principal Balance less than or equal to 0.0005 of the sum of the
     Class Y-3-L and Class Z-3-L Principal Balances and the Class Y-4-L
     Principal Balance less than or equal to 0.0005 of the sum of the Class
     Y-4-L and Class Z-4-L Principal Balances in each case after giving effect
     to allocations of Realized Losses and distributions to be made through the
     end of the Distribution Date to which such provisions relate; and

3.   Making the larger of (a) the fraction whose numerator is Y5 and whose
     denominator is the sum of Y5, the Class Z-1-L Principal Balance and the
     Class Z-3-L Principal Balance and (b) the fraction whose numerator is Y4
     and whose denominator is the sum of Y4 and the Class Z-4-L Principal
     Balance as large as possible while remaining less than or equal to 0.0005.

In the event of a failure of the foregoing portion of the definition of Class
Y-L Principal Reduction Amount to accomplish both of goals 1 and 2 above, the
amounts thereof should be adjusted to so as to accomplish such goals within the
requirement that each Class Y-L Principal Reduction Amount must be less than or
equal to the sum of (a) the principal portion of Realized Losses to be allocated
on the related Distribution Date for the related Loan Group or Subgroup
remaining after the allocation of such Realized Losses to the related Class P-L
Regular Interests and (b) the remainder of the REMIC I Available Distribution
Amount for the related Loan Group or Subgroup after reduction thereof by the
distributions to be made on such Distribution Date (i) to the related Class P-L
Regular Interests, (ii) to the related Class X-L Regular Interests and (iii) in
respect of interest on the related Class Y-L and Class Z-L Regular Interests,
or, if both of such goals cannot be accomplished within such requirement, such
adjustment as is necessary shall be made to accomplish goal 1 within such
requirement.  In the event of any conflict among the provisions of the
definition of the Class Y-L Principal Reduction Amounts, such conflict shall be
resolved on the basis of the goals and their priorities set forth above within
the requirement set forth in the preceding sentence.  It the formula allocation
of DY5 between DY1 and DY3 cannot be achieved because either DY1 as so defined
is greater than DP1 or DY3 as so defined is greater than DP3, such an allocation
shall be made as close as possible to the formula allocation within the
requirement that DY1 < DP1 and DY3 < DP3.

III. If Y1=0 or DP1=P1:

Make the following additional definitions:


                                          15
<PAGE>

Y6 =      Y2 + Y4.

P6 =      P2 + P4.

DY6 =     DY2 + DY4.


1.   If Y3 - a(P3 - DP3) > 0, Y6- a(P6 - DP6) > 0, and g(P6 - DP6) < (P3 - DP3),
                         -                    -
     DY3 = Y3 - ag(P6 - DP6) and DY6 = Y6 - a(P6 - DP6).

2.   If Y3 - a(P3 - DP3) > 0, Y6 - a(P6 - DP6) > 0, and g(P6 - DP6) >
                         -                     -                    -
     (P3 - DP3), DY3 = Y3 - a(P3 - DP3) and DY6 = Y6 - (a/g)(P3 - DP3).

3.   If Y3 - a(P3 - DP3) < 0, Y6 - a(P6 - DP6) > 0, and Y6 - a(P6 - DP6) >
                                               -                         -
     Y6 - (Y3/g), DY3 = Y3 - ag(P6 - DP6) and DY6 = Y6 - a(P6 - DP6).

4.   If Y3 - a(P3 - DP3) < 0, Y6 - (Y3/g) > 0, and Y6 - a(P6 - DP6) < 
                                          -                         -
     Y6 - (Y3/g), DY3 = 0 and DY6 = Y6 - (Y3/g).

5.   If Y6 - a(P6 - DP6) < 0, Y6 - (Y3/g) < 0, and Y3 - a(P3 - DP3) < 
                                                                    -
     Y3 - (gY6), DY3 = Y3 - (gY6) and DY6 = 0.

6.   If Y6 - a(P6 - DP6) < 0, Y3 - a(P3 - DP3) > 0, and Y3 - a(P3 - DP3) >
                                               -                         -
     Y3 - (gY6), DY3 = Y3 - a(P3 - DP3) and DY6 = Y6 - (a/g)(P3 - DP3).


DY2 = [Y2/(Y2 + Y4)]DY6

DY4 = [Y4/(Y2 + Y4)]DY6

DY1 = Y1.

The purpose of the foregoing definitional provisions together with the related
provisions allocating Realized Losses and defining the Class Y-L and Class Z-L
Principal Distribution Amounts is to accomplish the following goals in the
following order of priority:

     1.   Making the ratio of Y3 to Y6 equal to g after taking account of the
          allocation of Realized Losses and the distributions that will be made
          through end of the Distribution Date to which such provisions relate
          and assuring that the Principal Reduction Amount for each of the Class
          Y-1-L, Class Y-2-L, Class Y-3-L, Class Y-4-L, Class Z-1-L, Class
          Z-2-L, Class Z-3-L and Class Z-4-L Regular Interests is greater than
          or equal to zero for such Distribution Date;

     2.   Making the Class Y-2-L Principal Balance less than or equal to 0.0005
          of the sum of the Class Y-2-L and Class Z-2-L Principal Balances, the
          Class Y-3-L Principal Balance less


                                          16
<PAGE>

          than or equal to 0.0005 of the sum of the Class Y-3-L and Class Z-3-L
          Principal Balances and the Class Y-4-L Principal Balance less than or
          equal to 0.0005 of the sum of the Class Y-4-L and Class Z-4-L
          Principal Balances in each case after giving effect to allocations of
          Realized Losses and distributions to be made through the end of the
          Distribution Date to which such provisions relate; and

     3.   Making the larger of (a) the fraction whose numerator is Y3 and whose
          denominator is the sum of Y3 and Class Z-3-L Principal Balance and (b)
          the fraction whose numerator is Y6 and whose denominator is the sum of
          Y6, the Class Z-2-L Principal Balance and the Class Z-4-L Principal
          Balance as large as possible while remaining less than or equal to
          0.0005.

   In the event of a failure of the foregoing portion of the definition of Class
Y-L Principal Reduction Amount to accomplish both of goals 1 and 2 above, the
amounts thereof should be adjusted to so as to accomplish such goals within the
requirement that each Class Y-L Principal Reduction Amount must be less than or
equal to the sum of (a) the principal portion of Realized Losses to be allocated
on the related Distribution Date for the related Loan Group or Subgroup
remaining after the allocation of such Realized Losses to the related Class P-L
Regular Interests and (b) the remainder of the REMIC I Available Distribution
Amount for the related Loan Group or Subgroup after reduction thereof by the
distributions to be made on such Distribution Date (i) to the related Class P-L
Regular Interests, (ii) to the related Class X-L Regular Interests and (iii) in
respect of interest on the related Class Y-L and Class Z-L Regular Interests,
or, if both of such goals cannot be accomplished within such requirement, such
adjustment as is necessary shall be made to accomplish goal 1 within such
requirement.  In the event of any conflict among the provisions of the
definition of the Class Y-L Principal Reduction Amounts, such conflict shall be
resolved on the basis of the goals and their priorities set forth above within
the requirement set forth in the preceding sentence.  It the formula allocation
of DY6 between DY2 and DY4 cannot be achieved because either DY2 as so defined
is greater than DP2 or DY4 as so defined is greater than DP4, such an allocation
shall be made as close as possible to the formula allocation within the
requirement that DY2 < DP2 and DY4 < DP4.

IV.  If Y4=0 or DP4=P4:

Make the following additional definitions:

Y5 =      Y1 + Y3.

P5 =      P1 + P3.

DY5 =     DY1 + DY3.


1.   If Y5 - a(P5 - DP5) > 0, Y2- a(P2 - DP2) > 0, and g(P2 - DP2) < (P5 - DP5),
                         -                    -
     DY5 = Y5 - ag(P2 - DP2) and DY2 = Y2 - a(P2 - DP2).


                                          17
<PAGE>

2.   If Y5 - a(P5 - DP5) > 0, Y2 - a(P2 - DP2) > 0, and g(P2 - DP2) >
                         -                     -                    -
     (P5 - DP5), DY5 = Y5 - a(P5 - DP5) and DY2 = Y2 - (a/g)(P5 - DP5).

3.   If Y5 - a(P5 - DP5) < 0, Y2 - a(P2 - DP2) > 0, and Y2 - a(P2 - DP2) >
                                               -                         -
     Y2 - (Y5/g), DY5 = Y5 - ag(P2 - DP2) and DY2 = Y2 - a(P2 - DP2).

4.   If Y5 - a(P5 - DP5) < 0, Y2 - (Y5/g) > 0, and Y2 - a(P2 - DP2) < 
                                          -                         -
     Y2 - (Y5/g), DY5 = 0 and DY2 = Y2 - (Y5/g).

5.   If Y2 - a(P2 - DP2) < 0, Y2 - (Y5/g) < 0, and Y5 - a(P5 - DP5) < 
                                                                    -
     Y5 - (gY2), DY5 = Y5 - (gY2) and DY2 = 0.

6.   If Y2 - a(P2 - DP2) < 0, Y5 - a(P5 - DP5) > 0, and Y5 - a(P5 - DP5) >
                                               -                         -
     Y5 - (gY2), DY5 = Y5 - a(P5 - DP5) and DY2 = Y2 - (a/g)(P5 - DP5).


DY1 = [Y1/(Y1 + Y3)]DY5

DY3 = [Y3/(Y1 + Y3)]DY5

DY4 = Y4.

The purpose of the foregoing definitional provisions together with the related
provisions allocating Realized Losses and defining the Class Y-L and Class Z-L
Principal Distribution Amounts is to accomplish the following goals in the
following order of priority:

     1.   Making the ratio of Y5 to Y2 equal to g after taking account of the
          allocation of Realized Losses and the distributions that will be made
          through end of the Distribution Date to which such provisions relate
          and assuring that the Principal Reduction Amount for each of the Class
          Y-1-L, Class Y-2-L, Class Y-3-L, Class Y-4-L, Class Z-1-L Class Z-2-L,
          Class Z-3-L and Class Z-4-L Regular Interests is greater than or equal
          to zero for such Distribution Date;

     2.   Making the Class Y-1-L Principal Balance less than or equal to 0.0005
          of the sum of the Class Y-1-L and Class Z-1-L Principal Balances, the
          Class Y-2-L Principal Balance less than or equal to 0.0005 of the sum
          of the Class Y-2-L and Class Z-2-L Principal Balances and the Class
          Y-3-L Principal Balance less than or equal to 0.0005 of the sum of the
          Class Y-3-L and Class Z-3-L Principal Balances in each case after
          giving effect to allocations of Realized Losses and distributions to
          be made through the end of the Distribution Date to which such
          provisions relate; and

     3.   Making the larger of (a) the fraction whose numerator is Y5 and whose
          denominator is the sum of Y5, the Class Z-1-L Principal Balance and
          the Class Z-3-L Principal Balance and (b) the fraction whose numerator
          is Y2 and whose denominator is the sum of Y2 and the Class Z-2-L
          Principal Balance as large as possible while remaining less than or
          equal to 0.0005.


                                          18
<PAGE>

   In the event of a failure of the foregoing portion of the definition of Class
Y-L Principal Reduction Amount to accomplish both of goals 1 and 2 above, the
amounts thereof should be adjusted to so as to accomplish such goals within the
requirement that each Class Y-L Principal Reduction Amount must be less than or
equal to the sum of (a) the principal portion of Realized Losses to be allocated
on the related Distribution Date for the related Loan Group or Subgroup
remaining after the allocation of such Realized Losses to the related Class P-L
Regular Interests and (b) the remainder of the REMIC I Available Distribution
Amount for the related Loan Group or Subgroup after reduction thereof by the
distributions to be made on such Distribution Date (i) to the related Class P-L
Regular Interests, (ii) to the related Class X-L Regular Interests and (iii) in
respect of interest on the related Class Y-L and Class Z-L Regular Interests,
or, if both of such goals cannot be accomplished within such requirement, such
adjustment as is necessary shall be made to accomplish goal 1 within such
requirement.  In the event of any conflict among the provisions of the
definition of the Class Y-L Principal Reduction Amounts, such conflict shall be
resolved on the basis of the goals and their priorities set forth above within
the requirement set forth in the preceding sentence.  It the formula allocation
of DY5 between DY1 and DY3 cannot be achieved because either DY1 as so defined
is greater than DP1 or DY3 as so defined is greater than DP3, such an allocation
shall be made as close as possible to the formula allocation within the
requirement that DY1 < DP1 and DY3 < DP3.

V.   If Y3=0 or DP3=P3:

Make the following additional definitions:

Y6 =      Y2 + Y4.

P6 =      P2 + P4.

DY6 =     DY2 + DY4.


1.   If Y1 - a(P1 - DP1) > 0, Y6- a(P6 - DP6) > 0, and g(P6 - DP6) < (P1 - DP1),
                         -                    -
     DY1 = Y1 - ag(P6 - DP6) and DY6 = Y6 - a(P6 - DP6).

2.   If Y1 - a(P1 - DP1) > 0, Y6 - a(P6 - DP6) > 0, and g(P6 - DP6) >
                         -                     -                    -
     (P1 - DP1), DY1 = Y1 - a(P1 - DP1) and DY6 = Y6 - (a/g)(P1 - DP1).

3.   If Y1 - a(P1 - DP1) < 0, Y6 - a(P6 - DP6) > 0, and Y6 - a(P6 - DP6) >
                                               -                         -
     Y6 - (Y1/g), DY1 = Y1 - ag(P6 - DP6) and DY6 = Y6 - a(P6 - DP6).

4.   If Y1 - a(P1 - DP1) < 0, Y6 - (Y1/g) > 0, and Y6 - a(P6 - DP6) < 
                                          -                         -
     Y6 - (Y1/g), DY1 = 0 and DY6 = Y6 - (Y1/g).

5.   If Y6 - a(P6 - DP6) < 0, Y6 - (Y1/g) < 0, and Y1 - a(P1 - DP1) < 
                                                                    -
     Y1 - (gY6), DY1 = Y1 - (gY6) and DY6 = 0.


                                          19
<PAGE>

6.   If Y6 - a(P6 - DP6) < 0, Y1 - a(P1 - DP1) > 0, and Y1 - a(P1 - DP1) >
                                               -                         -
     Y1 - (gY6), DY1 = Y1 - a(P1 - DP1) and DY6 = Y6 - (a/g)(P1 - DP1).


DY2 = [Y2/(Y2 + Y4)]DY6

DY4 = [Y4/(Y2 + Y4)]DY6

DY3 = Y3.

The purpose of the foregoing definitional provisions together with the related
provisions allocating Realized Losses and defining the Class Y-L and Class Z-L
Principal Distribution Amounts is to accomplish the following goals in the
following order of priority:

1.   Making the ratio of Y1 to Y6 equal to g after taking account of the
     allocation of Realized Losses and the distributions that will be made
     through end of the Distribution Date to which such provisions relate and
     assuring that the Principal Reduction Amount for each of the Class Y-1-L,
     Class Y-2-L, Class Y-3-L, Class Y-4-L, Class Z-1-L, Class Z-2-L, Class
     Z-3-L and Class Z-4-L Regular Interests is greater than or equal to zero
     for such Distribution Date;

2.   Making the Class Y-1-L Principal Balance less than or equal to 0.0005 of
     the sum of the Class Y-1-L and Class Z-1-L Principal Balances, the Class
     Y-2-L Principal Balance less than or equal to 0.0005 of the sum of the
     Class Y-2-L and Class Z-2-L Principal Balances and the Class Y-4-L
     Principal Balance less than or equal to 0.0005 of the sum of the Class
     Y-4-L and Class Z-4-L Principal Balances in each case after giving effect
     to allocations of Realized Losses and distributions to be made through the
     end of the Distribution Date to which such provisions relate; and

3.   Making the larger of (a) the fraction whose numerator is Y1 and whose
     denominator is the sum of Y1 and Class Z-1-L Principal Balance and (b) the
     fraction whose numerator is Y6 and whose denominator is the sum of Y6, the
     Class Z-2-L Principal Balance and the Class Z-4-L Principal Balance as
     large as possible while remaining less than or equal to 0.0005.

   In the event of a failure of the foregoing portion of the  definition of
Class Y-L Principal Reduction Amount to accomplish both of goals 1 and 2 above,
the amounts thereof should be adjusted to so as to accomplish such goals within
the requirement that each Class Y-L Principal Reduction Amount must be less than
or equal to the sum of (a) the principal portion of Realized Losses to be
allocated on the related Distribution Date for the related Loan Group or
Subgroup remaining after the allocation of such Realized Losses to the related
Class P-L Regular Interests and (b) the remainder of the REMIC I Available
Distribution Amount for the related Loan Group or Subgroup after reduction
thereof by the distributions to be made on such Distribution Date (i) to the
related Class P-L Regular Interests, (ii) to the related Class X-L Regular
Interests and (iii) in respect of interest on the related Class Y-L and Class
Z-L Regular Interests, or, if both of such goals cannot be accomplished within
such requirement, such adjustment as is necessary shall be made to accomplish
goal 1 within such requirement.  In the event of any conflict among the
provisions of the definition of the Class Y-L Principal Reduction Amounts, such
conflict shall be


                                          20
<PAGE>

resolved on the basis of the goals and their priorities set forth above within
the requirement set forth in the preceding sentence.  It the formula allocation
of DY6 between DY2 and DY4 cannot be achieved because either DY2 as so defined
is greater than DP2 or DY4 as so defined is greater than DP4, such an allocation
shall be made as close as possible to the formula allocation within the
requirement that DY2 < DP2 and DY4 < DP4.

     CLASS Z-L PRINCIPAL REDUCTION AMOUNTS: For any Distribution Date, the
amounts by which the principal balances of the Class Z-1-L, Class Z-2-L, Class
Z-3-L and Class Z-4-L Regular Interests respectively will be reduced on such
Distribution Date by the allocation of Realized Losses and the distribution of
principal, which shall be in each case the excess of (A) the sum of (x) the
excess of the REMIC I Available Distribution Amount for the related Loan Group
or Subgroup over the sum of the amounts thereof distributable (i) to the related
Class P-L Regular Interests, (ii) to the related Class X-L Regular Interests and
(iii) in respect of interest on the related Class Y-L and Class Z-L Regular
Interests and (y) the excess of the Realized Losses allocable to principal for
the related Loan Group or Subgroup over the portion of such Realized Losses
allocable to the related Class P-L Regular Interests over (B) the Class Y-L
Principal Reduction Amount for the related Loan Group or Subgroup.

     CLASS Z-L REGULAR INTERESTS: The Class Z-1-L, Class Z-2-L, Class Z-3-L and
Class Z-4-L Regular Interests.

     CLASS Z-1-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.  The "related Loan Group" for the Class Z-1-L Regular Interests is
Loan Group I.

     CLASS Z-1-L PRINCIPAL DISTRIBUTION AMOUNT:  For any Distribution Date, the
excess, if any, of the Class Z-1-L Principal Reduction Amount for such
Distribution Date over the principal portion of Realized Losses allocated to the
Class Z-1-L Regular Interests on such Distribution Date.


CLASS Z-2-L REGULAR INTEREST: The uncertificated partial undivided beneficial
ownership interest in REMIC I which constitutes a REMIC I Regular Interest. The
"related Loan Group" for the Class Z-2-L Regular Interests is the Loan Group IV.

     CLASS Z-2-L PRINCIPAL DISTRIBUTION AMOUNT:  For any Distribution Date, the
excess, if any, of the Class Z-2-L Principal Reduction Amount for such
Distribution Date over the principal portion of Realized Losses allocated to the
Class Z-2-L Regular Interests on such Distribution Date.


     CLASS Z-3-L REGULAR INTEREST: The uncertificated partial undivided 
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular 
Interest. The "related Subgroup" for the Class Z-3-L Regular Interests is 
Subgroup II-1.

     CLASS Z-3-L PRINCIPAL DISTRIBUTION AMOUNT:  For any Distribution Date, the
excess, if any, of the Class Z-3-L Principal Reduction Amount for such
Distribution Date over the principal


                                          21
<PAGE>

portion of Realized Losses allocated to the Class Z-3-L Regular Interests on
such Distribution Date.


     CLASS Z-4-L REGULAR INTEREST: The uncertificated partial undivided 
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular 
Interest. The "related Subgroup" for the Class Z-4-L Regular Interests is 
Subgroup II-2.

     CLASS Z-4-L PRINCIPAL DISTRIBUTION AMOUNT:  For any Distribution Date, the
excess, if any, of the Class Z-4-L Principal Reduction Amount for such
Distribution Date over the principal portion of Realized Losses allocated to the
Class Z-4-L Regular Interests on such Distribution Date.


     CLASS I-A-1 CERTIFICATES: The Certificates designated as "Class I-A-1" on 
the face thereof in substantially the form attached hereto as Exhibit A-I-A-1.

     CLASS I-P CERTIFICATES: The Certificates designated as "Class I-P" on the
face thereof in substantially the form attached hereto as Exhibit A-I-P.

     CLASS I-P-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.

     CLASS I-P FRACTION: For each Class I-P Mortgage Loan, a fraction, the
numerator of which is 7.000% less the Pass-Through Rate on such Class I-P
Mortgage Loan and the denominator of which is 7.000%.

     CLASS I-P MORTGAGE LOAN: Any Group I Loan with a Pass-Through Rate of less
than 7.000% per annum.

     CLASS I-X CERTIFICATES: The Certificates designated as "Class I-X" on the
face thereof in substantially the form attached hereto as Exhibit A-I-X.

     CLASS I-X-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.

     CLASS I-X NOTIONAL AMOUNT:  With respect to any Distribution Date, the
product of (x) the aggregate scheduled principal balance, as of the second
preceding Due Date after giving effect to payments scheduled to be received as
of such Due Date, whether or not received, or with respect to the initial
Distribution Date, as of the Cut-Off Date, of the Group I Premium Rate Mortgage
Loans and (y) a fraction, the numerator of which is the weighted average of the
Stripped Interest Rates  for the Group I Premium Rate Mortgage Loans as of such
Due Date and the denominator of which is 7.000%.

     CLASS II-A-1 CERTIFICATES: The Certificates designated as "Class II-A-1" on
the face thereof in substantially the form attached hereto as Exhibit A-II-A-1.

     CLASS II-P CERTIFICATES: The Certificates designated as "Class II-P" on the
face thereof in substantially the form attached hereto as Exhibit A-II-P.


                                          22
<PAGE>

     CLASS II-P-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.

     CLASS II-P FRACTION: For each Class II-P Mortgage Loan in Subgroup II-1, a
fraction, the numerator of which is 7.000% less the Pass-Through Rate on such
Class II-P Mortgage Loan and the denominator of which is 7.000%. For each Class
II-P Mortgage Loan in Subgroup II-2, a fraction, the numerator of which is
6.750% less the Pass-Through Rate on such Class II-P Mortgage Loan and the
denominator of which is 6.750%

     CLASS II-P MORTGAGE LOAN: Any Subgroup II-1 Loan with a Pass-Through Rate
of less than 7.000% per annum and any Subgroup II-2 Loan with a Pass-Through
Rate of less than 6.750% per annum.

     CLASS II-X CERTIFICATES: The Certificates designated as "Class II-X" on the
face thereof in substantially the form attached hereto as Exhibit A-II-X.

     CLASS II-X-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.

     CLASS II-X NOTIONAL AMOUNT:  With respect to any Distribution Date, the
product of (x) the aggregate scheduled principal balance, as of the second
preceding Due Date after giving effect to payments scheduled to be received as
of such Due Date, whether or not received, or with respect to the initial
Distribution Date, as of the Cut-Off Date, of the Group II Premium Rate Mortgage
Loans and (y) a fraction, the numerator of which is the weighted average of the
Stripped Interest Rates for the Group II Premium Rate Mortgage Loans as of such
Due Date and the denominator of which is 6.750%.

     CLASS III-A-1 CERTIFICATES: The Certificates designated as "Class III-A-1"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-1.

     CLASS III-A-2 CERTIFICATES: The Certificates designated as "Class III-A-2"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-2.

     CLASS III-A-3 CERTIFICATES: The Certificates designated as "Class III-A-3"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-3.

     CLASS III-A-4 CERTIFICATES: The Certificates designated as "Class III-A-4"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-4.

     CLASS III-A-5 CERTIFICATES: The Certificates designated as "Class III-A-5"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-5.

     CLASS III-A-6 CERTIFICATES: The Certificates designated as "Class III-A-6"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-6.

     CLASS III-A-7 CERTIFICATES: The Certificates designated as "Class III-A-7"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-7.


                                          23
<PAGE>

     CLASS III-A-8 CERTIFICATES: The Certificates designated as "Class III-A-8"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-8.

     CLASS III-A-9 CERTIFICATES: The Certificates designated as "Class III-A-9"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-A-9.

     CLASS III-A-10 CERTIFICATES: The Certificates designated as "Class
III-A-10" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-10.

     CLASS III-A-11 CERTIFICATES: The Certificates designated as "Class
III-A-11" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-11.

     CLASS III-A-11 ACCRETION TERMINATION DATE: The earlier to occur of (i) the
Distribution Date on which the Class III-A-9 Principal Balance and the Component
III-A-10-1 Principal Balance have each been reduced to zero and (ii) the Group
III Credit Support Depletion Date.

     CLASS III-A-11 ACCRUAL AMOUNT: On any Distribution Date, an amount equal to
the amount allocable to the Class III-A-11 Certificates on such Distribution
Date pursuant to the definition of "Interest Distribution Amount", without
regard to the proviso at the end of the first sentence of such definition.
Notwithstanding the foregoing, for any Distribution Date after the Class
III-A-11 Accretion Termination Date, the Class III-A-11 Accrual Amount shall be
zero.

     CLASS III-A-12 CERTIFICATES: The Certificates designated as "Class
III-A-12" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-12.

     CLASS III-A-13 CERTIFICATES: The Certificates designated as "Class
III-A-13" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-13.

     CLASS III-A-14 CERTIFICATES: The Certificates designated as "Class
III-A-14" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-14.

     CLASS III-A-15 CERTIFICATES: The Certificates designated as "Class
III-A-15" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-15.

     CLASS III-A-16 CERTIFICATES: The Certificates designated as "Class
III-A-16" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-16.

     CLASS III-A-16 ACCRETION TERMINATION DATE: The earlier to occur of (i) the
Distribution Date on which the Class III-A-1 Principal Balance has been reduced
to zero and (ii) the Group III Credit Support Depletion Date.

     CLASS III-A-16 ACCRUAL AMOUNT: On any Distribution Date, an amount equal to
the amount allocable to the Class III-A-16 Certificates on such Distribution
Date pursuant to the definition of "Interest Distribution Amount", without
regard to the proviso at the end of the first sentence of such definition.
Notwithstanding the foregoing, for any Distribution Date after the Class
III-A-16 Accretion Termination Date, the Class III-A-16 Accrual Amount shall be
zero.


                                          24
<PAGE>

     CLASS III-A-17 CERTIFICATES: The Certificates designated as "Class
III-A-17" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-17.

     CLASS III-A-17 ACCRETION TERMINATION DATE: The earlier to occur of (i) the
Distribution Date on which the Class III-A-15 Principal Balance, the Class
III-A-18 Principal Balance and the Component III-A-10-2 Principal Balance have
each been reduced to zero and (ii) the Group III Credit Support Depletion Date.

     CLASS III-A-17 ACCRUAL AMOUNT: On any Distribution Date, an amount equal to
the amount allocable to the Class III-A-17 Certificates on such Distribution
Date pursuant to the definition of "Interest Distribution Amount", without
regard to the proviso at the end of the first sentence of such definition.
Notwithstanding the foregoing, for any Distribution Date after the Class
III-A-17 Accretion Termination Date, the Class III-A-17 Accrual Amount shall be
zero.

     CLASS III-A-18 CERTIFICATES: The Certificates designated as "Class
III-A-18" on the face thereof in substantially the form attached hereto as
Exhibit A-III-A-18.

     CLASS III-B-1 CERTIFICATES: The Certificates designated as "Class III-B-1"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-B-1.

     CLASS III-B-2 CERTIFICATES: The Certificates designated as "Class III-B-2"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-B-2.

     CLASS III-B-3 CERTIFICATES: The Certificates designated as "Class III-B-3"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-B-3.

     CLASS III-B-4 CERTIFICATES: The Certificates designated as "Class III-B-4"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-B-4.

     CLASS III-B-5 CERTIFICATES: The Certificates designated as "Class III-B-5"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-B-5.

     CLASS III-B-6 CERTIFICATES: The Certificates designated as "Class III-B-6"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-B-6.

     CLASS III-P CERTIFICATES: The Certificates designated as "Class III-P" on
the face thereof in substantially the form attached hereto as Exhibit A-III-P.

     CLASS III-P FRACTION: For each Class III-P Mortgage Loan, a fraction, the
numerator of which is 6.750% less the Pass-Through Rate on such Class III-P
Mortgage Loan and the denominator of which is 6.750%.

     CLASS III-P MORTGAGE LOAN: Any Group III Loan with a Pass-Through Rate of
less than 6.750% per annum.

     CLASS III-X-1 CERTIFICATES: The Certificates designated as "Class III-X-1"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-X-1.


                                          25
<PAGE>

     CLASS III-X-1-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.

     CLASS III-X-1 NOTIONAL AMOUNT:  With respect to any Distribution Date, the
product of (x) the aggregate scheduled principal balance, as of the second
preceding Due Date after giving effect to payments scheduled to be received as
of such Due Date, whether or not received, or with respect to the initial
Distribution Date, as of the Cut-Off Date, of the Class III-X-1 Premium Rate
Mortgage Loans and (y) a fraction, the numerator of which is the weighted
average of the Stripped Interest Rates for the Class III-X-1 Premium Rate
Mortgage Loans as of such Due Date and the denominator of which is 6.750%.

     CLASS III-X-1 PREMIUM RATE MORTGAGE LOANS:  The Subgroup III-1 Loans having
Pass-Through Rates in excess of 6.750% per annum.

     CLASS III-X-2 CERTIFICATES: The Certificates designated as "Class III-X-2"
on the face thereof in substantially the form attached hereto as Exhibit
A-III-X-2.

     CLASS III-X-2-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.

     CLASS III-X-2 NOTIONAL AMOUNT:  With respect to any Distribution Date, the
product of (x) the aggregate scheduled principal balance, as of the second
preceding Due Date after giving effect to payments scheduled to be received as
of such Due Date, whether or not received, or with respect to the initial
Distribution Date, as of the Cut-Off Date, of the Class III-X-2 Premium Rate
Mortgage Loans and (y) a fraction, the numerator of which is the weighted
average of the Stripped Interest Rates for the Class III-X-2 Premium Rate
Mortgage Loans as of such Due Date and the denominator of which is 6.750%.

     CLASS III-X-2 PREMIUM RATE MORTGAGE LOANS:  The Subgroup III-2 Loans having
Pass-Through Rates in excess of 6.750% per annum.

     CLASS IV-A-1 CERTIFICATES: The Certificates designated as "Class IV-A-1" on
the face thereof in substantially the form attached hereto as Exhibit A-IV-A-1.

     CLASS IV-A-2 CERTIFICATES: The Certificates designated as "Class IV-A-2" on
the face thereof in substantially the form attached hereto as Exhibit A-IV-A-2.

     CLASS IV-P CERTIFICATES: The Certificates designated as "Class IV-P" on the
face thereof in substantially the form attached hereto as Exhibit A-IV-P.

     CLASS IV-P-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.

     CLASS IV-P FRACTION: For each Class IV-P Mortgage Loan, a fraction, the
numerator of which is 6.750% less the Pass-Through Rate on such Class IV-P
Mortgage Loan and the denominator of which is 6.750%.


                                          26
<PAGE>

     CLASS IV-P MORTGAGE LOAN: Any Group IV Loan with a Pass-Through Rate of
less than 6.750% per annum.

     CLASS IV-X CERTIFICATES: The Certificates designated as "Class IV-X" on the
face thereof in substantially the form attached hereto as Exhibit A-IV-X.

     CLASS IV-X-L REGULAR INTEREST: The uncertificated partial undivided
beneficial ownership interest in REMIC I which constitutes a REMIC I Regular
Interest.

     CLASS IV-X NOTIONAL AMOUNT:  With respect to any Distribution Date, the
product of (x) the aggregate scheduled principal balance, as of the second
preceding Due Date after giving effect to payments scheduled to be received as
of such Due Date, whether or not received, or with respect to the initial
Distribution Date, as of the Cut-Off Date, of the Group IV Premium Rate Mortgage
Loans and (y) a fraction, the numerator of which is the weighted average of the
Stripped Interest Rates for the Group IV Premium Rate Mortgage Loans as of such
Due Date and the denominator of which is 6.750%.

     CLASS NOTIONAL AMOUNT:  With respect to any of the Class X Certificates or
the Class X-L Regular Interests, the related notional amount for any such Class,
as specified herein (i.e. the "Class Notional Amount" for the Class I-X
Certificates and the Class I-X-L Regular Interests is the Class I-X Notional
Amount).

     CLASS PRINCIPAL BALANCE: For any Class of Certificates and for any Class of
Regular Interests, the applicable initial Class Principal Balance therefor set
forth in the Preliminary Statement hereto, corresponding to the rights of such
Class in payments of principal due to be passed through to Certificateholders or
Holders of the REMIC I Regular Interests from principal payments on the Mortgage
Loans or the REMIC I Regular Interests, as applicable, as reduced from time to
time by (x) distributions of principal to Certificateholders or Holders of the
REMIC I Regular Interests of such Class (including, with respect to the
Accretion Directed Classes and the Accretion Directed Components, the portions
of the Class III-A-11 Accrual Amount, the Class III-A-16 Accrual Amount and the
Class III-A-17 Accrual Amount distributed to such Classes and Components) and
(y) the portion of Realized Losses allocated to the Class Principal Balance of
such Class pursuant to the definition of "Realized Loss" with respect to a given
Distribution Date. For any Distribution Date, the reduction of the Class
Principal Balance of any Class of Certificates and REMIC I Regular Interests
pursuant to the definition of "Realized Loss" shall be deemed effective prior to
the determination and distribution of principal on such Class pursuant to the
definition of "REMIC I Distribution Amount" and "REMIC II Distribution Amount",
as applicable. In addition to the foregoing, (i) on each Distribution Date on or
before the Class III-A-11 Accretion Termination Date, the Class III-A-11
Principal Balance will be increased by the Class III-A-11 Accrual Amount for
such Distribution Date, (ii) on each Distribution Date on or before the Class
III-A-16 Accretion Termination Date, the Class III-A-16 Principal Balance will
be increased by the Class III-A-16 Accrual Amount for such Distribution Date and
(iii) on each Distribution Date on or before the Class III-A-17 Accretion
Termination Date, the Class III-A-17 Principal Balance will be increased by the
Class III-A-17 Accrual Amount for such Distribution Date.  Notwithstanding the
foregoing, any amounts distributed in respect of losses pursuant to paragraphs
(I)(d)(ii) or (I)(e)(vi) of the definition of "REMIC II Distribution Amount"
shall not


                                          27
<PAGE>

cause a further reduction in the Class Principal Balances of the Class P
Certificates, as applicable.  The Class Principal Balance for the Class I-A-1
Certificates shall be referred to as the "Class I-A-1 Principal Balance", the
Class Principal Balance for the Class Y-1-L Regular Interests shall be referred
to as the "Class Y-1-L Principal Balance", and so on.  The Class Principal
Balance for the Class X Certificates and the Class X-L Regular Interests shall
be zero. The Class III-A-8 Principal Balance shall equal the sum of the
Component III-A-8-1 Principal Balance and the Component III-A-8-2 Principal
Balance. The Class III-A-10 Principal Balance shall equal the sum of the
Component III-A-10-1 Principal Balance and the Component III-A-10-2 Principal
Balance.

     CLASS R-1 CERTIFICATES: The Certificates designated as "Class R-1" on 
the face thereof in substantially the form attached hereto as Exhibit C, 
which have been designated as the single class of "residual interest" in the 
REMIC I pursuant to Section 2.01.

     CLASS R-2 CERTIFICATES: The Certificates designated as "Class R-2" on the
face thereof in substantially the form attached hereto as Exhibit B, which have
been designated as the single class of "residual interest" in the REMIC II
pursuant to Section 2.05.

     CLEARING AGENCY: An organization registered as a "clearing agency" pursuant
to Section 17A of the Securities Exchange Act of 1934, as amended, which
initially shall be DTC.

     CLOSING DATE: April 29, 1998, which is the date of settlement of the sale
of the Certificates to the original purchasers thereof.

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

     COMBINED BANKRUPTCY COVERAGE: With respect to Loan Group I, Loan Group II
and Loan Group IV, the Bankruptcy Coverage Initial Amount for such Loan Groups
less (a) any scheduled or permissible reduction in the amount of Combined
Bankruptcy Coverage pursuant to this definition and (b) Bankruptcy Losses
allocated to the Group I, Group II, Group IV and Group C-B Certificates since
the Cut-Off Date. The Combined Bankruptcy Coverage may be reduced upon written
confirmation from the Rating Agencies that such reduction will not adversely
affect the then current ratings assigned to the Certificates by the Rating
Agencies.

     COMBINED CREDIT SUPPORT DEPLETION DATE: The first Distribution Date on
which the aggregate of the Class Principal Balances of the Group C-B
Certificates has been or will be reduced to zero as a result of principal
distributions thereon and the allocation of Realized Losses on such Distribution
Date.

     COMBINED FRAUD COVERAGE:  During the period prior to the first anniversary
of the Cut-Off Date and with respect to Loan Group I, Loan Group II and Loan
Group IV, the Fraud Coverage Initial Amount for such Loan Groups reduced by
Fraud Losses allocated to the Group I, Group II, Group IV and Group C-B
Certificates; during the period from the first anniversary of the Cut-Off Date
to (but not including) the fifth anniversary of the Cut-Off Date, the amount of
the Combined Fraud Coverage on the most recent previous anniversary of the
Cut-Off Date (calculated in accordance with the second sentence of this
definition) reduced by Fraud Losses allocated to the Group I, Group II, Group IV
and Group C-B Certificates since such anniversary;


                                          28
<PAGE>

and during the period on and after the fifth anniversary of the Cut-Off Date,
the Combined Fraud Coverage shall be zero. On each anniversary of the Cut-Off
Date, the Combined Fraud Coverage  shall be reduced to the lesser of (i) on the
first, second, third, and fourth anniversaries of the Cut-Off Date, 1.00% of the
aggregate principal balance of the Mortgage Loans in Loan Group I, Loan Group II
and Loan Group IV as of the Due Date in the preceding month and (ii) the excess
of the Fraud Coverage Initial Amount for Loan Group I, Loan Group II and Loan
Group IV over cumulative Fraud Losses allocated to the Group I, Group II, Group
IV and Group C-B Certificates since the Cut-Off Date. The Combined Fraud
Coverage may be reduced upon written confirmation from the Rating Agencies that
such reduction will not adversely affect the then current ratings assigned to
the Group I, Group II, Group IV and Group C-B Certificates by the Rating
Agencies.

     COMBINED SPECIAL HAZARD COVERAGE: With respect to Loan Group I, Loan Group
II and Loan Group IV, the Special Hazard Coverage Initial Amount for such Loan
Groups less Special Hazard Losses allocated to the Group I, Group II, Group IV
and Group C-B Certificates and the amount of any scheduled reduction in the
amount of Combined Special Hazard Coverage as follows: on each anniversary of
the Cut-Off Date, the Combined Special Hazard Coverage shall be reduced, but not
increased, to an amount equal to the lesser of (i) the greatest of (a) the
aggregate principal balance of the Mortgage Loans in Loan Group I, Loan Group II
and Loan Group IV located in the single California zip code area containing the
largest aggregate principal balance of such Mortgage Loans, (b) 1% of the
aggregate unpaid principal balance of the Mortgage Loans in Loan Group I, Loan
Group II and Loan Group IV and (c) twice the unpaid principal balance of the
largest single Mortgage Loan in Loan Group I, Loan Group II and Loan Group IV,
in each case calculated as of the Due Date in the immediately preceding month,
and (ii) the Special Hazard Coverage Initial Amount for such Loan Groups as
reduced by the Special Hazard Losses allocated to the Group I, Group II, Group
IV and Group C-B Certificates since the Cut-Off Date. The Combined Special
Hazard Coverage may be reduced upon written confirmation from the Rating
Agencies that such reduction will not adversely affect the then current ratings
assigned to the Certificates by the Rating Agencies.

     COMPONENT: A portion of the Class III-A-8 and Class III-A-10 Certificates
representing parts of the entitlement of each such Class to principal and/or
interest, in each case as set forth in the Preliminary Statement hereto and the
remainder of the Agreement.

     COMPONENT III-A-8-1: A portion of the Class III-A-8 Certificates
representing part of the entitlement of such Class to principal and interest as
described in the Preliminary Statement hereto and the remainder of the
Agreement.

     COMPONENT III-A-8-2: A portion of the Class III-A-8 Certificates
representing part of the entitlement of such Class to principal and interest as
described in the Preliminary Statement hereto and the remainder of the
Agreement.

     COMPONENT III-A-10-1: A portion of the Class III-A-10 Certificates
representing part of the entitlement of such Class to principal as described in
the Preliminary Statement hereto and the remainder of the Agreement.


                                          29
<PAGE>

     COMPONENT III-A-10-2: A portion of the Class III-A-10 Certificates
representing part of the entitlement of such Class to principal as described in
the Preliminary Statement hereto and the remainder of the Agreement.

     COMPONENT PRINCIPAL BALANCE: For any Component of the Class III-A-8 and
Class III-A-10 Certificates, the applicable Initial Component Principal Balance
therefor set forth in the Preliminary Statement hereto, corresponding to the
rights of such Component in payments of principal due to be passed through to
the Component from principal payments on the Mortgage Loans as reduced from time
to time by (x) distributions of principal to the Class III-A-8 or Class II-A-10
Certificates, as applicable, in respect of such Component (including, with
respect to Component III-A-10-1, the portion of the Class III-A-11 Accrual
Amount distributed to such Component and with respect to Component III-A-10-2,
the portion of the Class III-A-17 Accrual Amount distributed to such Component)
and (y) the portion of Realized Losses allocated to the Component Principal
Balance in respect of such Component pursuant to the definition of "Realized
Loss" with respect to a given Distribution Date. For any Distribution Date, the
reduction of the Component Principal Balance of any Component pursuant to the
definition of "Realized Loss" shall be deemed effective prior to the
determination and distribution of principal on such Component pursuant to the
definition of "REMIC II Distribution Amount".  The Component Principal Balance
for Component III-A-8-1 of the Class III-A-8 Certificates shall be referred to
as the "Component III-A-8-1 Principal Balance", and so on.

     COMPANY: PNC Mortgage Securities Corp., a Delaware corporation, or its
successor-in-interest.

     COMPENSATING INTEREST: For any Distribution Date with respect to each Loan
Group and the Mortgage Loans contained therein, the lesser of (i) the sum of (a)
the aggregate Master Servicing Fee payable with respect to such Loan Group on
such Distribution Date, (b) the aggregate Payoff Earnings with respect to such
Loan Group and (c) the aggregate Payoff Interest with respect to such Loan Group
and (ii) the aggregate Uncollected Interest with respect to such Loan Group.

     COOPERATIVE: A private, cooperative housing corporation organized under the
laws of, and headquartered in, the States of New York or New Jersey which owns
or leases land and all or part of a building or buildings located in such
states, including apartments, spaces used for commercial purposes and common
areas therein and whose board of directors authorizes, among other things, the
sale of Cooperative Stock.

     COOPERATIVE APARTMENT: A dwelling unit in a multi-dwelling building owned
or leased by a Cooperative, which unit the Mortgagor has an exclusive right to
occupy pursuant to the terms of a proprietary lease or occupancy agreement.

     COOPERATIVE LEASE: With respect to a Cooperative Loan, the proprietary
lease or occupancy agreement with respect to the Cooperative Apartment occupied
by the Mortgagor and relating to the related Cooperative Stock, which lease or
agreement confers an exclusive right to the holder of such Cooperative Stock to
occupy such apartment.


                                          30
<PAGE>

     COOPERATIVE LOANS:  Any of the Mortgage Loans made in respect of a
Cooperative Apartment, evidenced by a Mortgage Note and secured by (i) a
Security Agreement, (ii) the related Cooperative Stock Certificate, (iii) an
assignment or mortgage of the Cooperative Lease, (iv) financing statements and
(v) a stock power (or other similar instrument), and ancillary thereto, a
recognition agreement between the Cooperative and the originator of the
Cooperative Loan, each of which was transferred and assigned to the Trustee
pursuant to Section 2.01 and are from time to time held as part of REMIC I
created hereunder.

     COOPERATIVE STOCK:  With respect to a Cooperative Loan, the single
outstanding class of stock, partnership interest or other ownership instrument
in the related Cooperative.

     COOPERATIVE STOCK CERTIFICATE:  With respect to a Cooperative Loan, the
stock certificate or other instrument evidencing the related Cooperative Stock.

     CORPORATE TRUST OFFICE: The corporate trust office of the Trustee in the
State of Minnesota, at which at any particular time its corporate trust business
with respect to this Agreement shall be administered, which office at the date
of the execution of this Agreement is located at 180 East 5th Street, SPFT0210,
St. Paul, MN 55101, Attention: Structured Finance PNC 1998-4.

     CURTAILMENT: Any payment of principal on a Mortgage Loan, made by or on
behalf of the related Mortgagor, other than a Monthly Payment, a Prepaid Monthly
Payment or a Payoff, which is applied to reduce the outstanding principal
balance of the Mortgage Loan.

     CURTAILMENT SHORTFALL: With respect to any Curtailment applied with a
Monthly Payment other than a Prepaid Monthly Payment, an amount equal to one
month's interest on such Curtailment at the applicable Pass-Through Rate on such
Mortgage Loan.

     CUSTODIAL ACCOUNT FOR P&I: The Custodial Account for principal and interest
established and maintained by each Servicer pursuant to its Selling and
Servicing Contract and caused by the Master Servicer to be established and
maintained pursuant to Section 3.02 (a) with the corporate trust department of
the Trustee or another financial institution approved by the Master Servicer
such that the rights of the Master Servicer, the Trustee and the
Certificateholders thereto shall be fully protected against the claims of any
creditors of the applicable Servicer and of any creditors or depositors of the
institution in which such account is maintained, (b) within FDIC insured
accounts (or other accounts with comparable insurance coverage acceptable to the
Rating Agencies) created, maintained and monitored by a Servicer or (c) in a
separate non-trust account without FDIC or other insurance in an Eligible
Institution. In the event that a Custodial Account for P&I is established
pursuant to clause (b) of the preceding sentence, amounts held in such Custodial
Account for P&I shall not exceed the level of deposit insurance coverage on such
account; accordingly, more than one Custodial Account for P&I may be
established. Any amount that is at any time not protected or insured in
accordance with the first sentence of this definition of "Custodial Account for
P&I" shall promptly be withdrawn from such Custodial Account for P&I and be
remitted to the Investment Account.


                                          31
<PAGE>

     CUSTODIAL ACCOUNT FOR RESERVES: The Custodial Account for Reserves
established and maintained by each Servicer pursuant to its Selling and
Servicing Contract and caused by the Master Servicer to be established and
maintained pursuant to Section 3.02 (a) with the corporate trust department of
the Trustee or another financial institution approved by the Master Servicer
such that the rights of the Master Servicer, the Trustee and the
Certificateholders thereto shall be fully protected against the claims of any
creditors of the applicable Servicer and of any creditors or depositors of the
institution in which such account is maintained, (b) within FDIC insured
accounts (or other accounts with comparable insurance coverage acceptable to the
Rating Agencies) created, maintained and monitored by a Servicer or (c) in a
separate non-trust account without FDIC or other insurance in an Eligible
Institution. In the event that a Custodial Account for Reserves is established
pursuant to clause (b) of the preceding sentence, amounts held in such Custodial
Account for Reserves shall not exceed the level of deposit insurance coverage on
such account; accordingly, more than one Custodial Account for Reserves may be
established. Any amount that is at any time not protected or insured in
accordance with the first sentence of this definition of "Custodial Account for
Reserves" shall promptly be withdrawn from such Custodial Account for Reserves
and be remitted to the Investment Account.

     CUSTODIAL AGREEMENT: The agreement, if any, among the Master Servicer, the
Trustee and a Custodian providing for the safekeeping of the Mortgage Files on
behalf of the Certificateholders.

     CUSTODIAN: A custodian which is not an affiliate of the Master Servicer or
the Company and which is appointed pursuant to a Custodial Agreement. Any
Custodian so appointed shall act as agent on behalf of the Trustee, and shall be
compensated by the Trustee at no additional charge to the Master Servicer. The
Trustee shall remain at all times responsible under the terms of this Agreement,
notwithstanding the fact that certain duties have been assigned to a Custodian.

     CUT-OFF DATE: April 1, 1998.

     DEFINITIVE CERTIFICATES: Certificates in definitive, fully registered and
certificated form.

     DEPOSITARY AGREEMENT: The Letter of Representations, dated April 28, 1998
by and among DTC, the Company and the Trustee.

     DESTROYED MORTGAGE NOTE: A Mortgage Note the original of which was
permanently lost or destroyed and has not been replaced.

     DETERMINATION DATE: A day not later than the 10th day preceding a related
Distribution Date.

     DISQUALIFIED ORGANIZATION:  Any Person which is not a Permitted Transferee,
but does not include any Pass-Through Entity which owns or holds a Residual
Certificate and of which a Disqualified Organization, directly or indirectly,
may be a stockholder, partner or beneficiary.

     DISTRIBUTION DATE: With respect to distributions on the REMIC I Regular
Interests and the Certificates, the 25th day (or, if such 25th day is not a
Business Day, the Business Day 

                                          32
<PAGE>

immediately succeeding such 25th day) of each month, with the first such date
being May 26, 1998.

     DTC: The Depository Trust Company.

     DTC PARTICIPANT: A broker, dealer, bank, other financial institution or
other Person for whom DTC effects book-entry transfers and pledges of securities
deposited with DTC.

     DUE DATE: The first day of each calendar month, which is the day on which
the Monthly Payment for each Mortgage Loan is due.

     ELIGIBLE INSTITUTION: An institution having (i) the highest short-term debt
rating, and one of the two highest long-term debt ratings of the Rating
Agencies, (ii) with respect to any Custodial Account for P&I and special
Custodial Account for Reserves, an unsecured long-term debt rating of at least
one of the two highest unsecured long-term debt ratings of the Rating Agencies,
(iii) with respect to any Buydown Fund Account or Custodial Account which also
serves as a Buydown Fund Account, the highest unsecured long-term debt rating by
the Rating Agencies, or (iv) the approval of the Rating Agencies. Such
institution may be the Servicer if the applicable Selling and Servicing Contract
requires the Servicer to provide the Master Servicer with written notice on the
Business Day following the date on which the Servicer determines that such
Servicer's short-term debt and unsecured long-term debt ratings fail to meet the
requirements of the prior sentence.

     ELIGIBLE INVESTMENTS: Any one or more of the obligations or securities
listed below in which funds deposited in the Investment Account, the Certificate
Account, the Custodial Account for P&I and the Custodial Account for Reserves
may be invested:

          (i)       Obligations of, or guaranteed as to principal and interest
     by, the United States or any agency or instrumentality thereof when such
     obligations are backed by the full faith and credit of the United States;

          (ii)      Repurchase agreements on obligations described in clause (i)
     of this definition of "Eligible Investments", provided that the unsecured
     obligations of the party agreeing to repurchase such obligations have at
     the time one of the two highest short term debt ratings of the Rating
     Agencies and provided that such repurchaser's unsecured long term debt has
     one of the two highest unsecured long term debt ratings of the Rating
     Agencies;

          (iii)     Federal funds, certificates of deposit, time deposits and
     bankers' acceptances of any U.S. bank or trust company incorporated under
     the laws of the United States or any state, provided that the debt
     obligations of such bank or trust company (or, in the case of the principal
     bank in a bank holding company system, debt obligations of the bank holding
     company) at the date of acquisition thereof have one of the two highest
     short term debt ratings of the Rating Agencies and unsecured long term debt
     has one of the two highest unsecured long term debt ratings of the Rating
     Agencies;

                                          33
<PAGE>

          (iv)      Obligations of, or obligations guaranteed by, any state of
     the United States or the District of Columbia, provided that such
     obligations at the date of acquisition thereof shall have the highest 
     long-term debt ratings available for such securities from the Rating 
     Agencies;

          (v)       Commercial paper of any corporation incorporated under the
     laws of the United States or any state thereof, which on the date of
     acquisition has the highest commercial paper rating of the Rating Agencies,
     provided that the corporation has unsecured long term debt that has one of
     the two highest unsecured long term debt ratings of the Rating Agencies;

          (vi)      Securities (other than stripped bonds or stripped coupons)
     bearing interest or sold at a discount that are issued by any corporation
     incorporated under the laws of the United States or any state thereof and
     have the highest long-term unsecured rating available for such securities
     from the Rating Agencies; provided, however, that securities issued by any
     such corporation will not be investments to the extent that investment
     therein would cause the outstanding principal amount of securities issued
     by such corporation that are then held as part of the Investment Account or
     the Certificate Account to exceed 20% of the aggregate principal amount of
     all Eligible Investments then held in the Investment Account and the
     Certificate Account;

          (vii)     Units of taxable money market funds (which may be 12b-1
     funds, as contemplated under the rules promulgated by the Securities and
     Exchange Commission under the Investment Company Act of 1940), which funds
     have the highest rating available for such securities from the Rating
     Agencies or which have been designated in writing by the Rating Agencies as
     Eligible Investments; and

          (viii)    Such other investments the investment in which will not, as
     evidenced by a letter from each of the Rating Agencies, result in the
     downgrading or withdrawal of the Ratings;

PROVIDED, HOWEVER, that such obligation or security is held for a temporary
period pursuant to Section 1.860G-2(g)(1) of the Treasury Regulations, and that
such period can in no event exceed thirteen months.

     In no event shall an instrument be an Eligible Investment if such
instrument (a) evidences a right to receive only interest payments with respect
to the obligations underlying such instrument or (b) has been purchased at a
price greater than the outstanding principal balance of such instrument.

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

     EVENT OF DEFAULT: Any event of default as specified in Section 7.01.

     EXCESS LIQUIDATION PROCEEDS: With respect to any Distribution Date, the
excess, if any, of aggregate Liquidation Proceeds received during the Prior
Period over the amount that would have 

                                          34
<PAGE>

been received if Payoffs had been made with respect to such Mortgage Loans on
the date such Liquidation Proceeds were received.

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

     FHA: Federal Housing Administration, or any successor thereto.

     FHLB: Federal Home Loan Bank of San Francisco, or any successor thereto.

     FHLMC: Federal Home Loan Mortgage Corporation, or any successor thereto.

     FITCH: Fitch IBCA, Inc., provided that at any time it be a Rating Agency.

     FNMA: Federal National Mortgage Association, or any successor thereto.

     FRAUD COVERAGE INITIAL AMOUNT:  With respect to Loan Group I, Loan Group II
and Loan Group IV, $8,356,299 and with respect to Loan Group III, $4,182,160.

     FRAUD LOSS: The occurrence of a loss on a Mortgage Loan arising from any
action, event or state of facts with respect to such Mortgage Loan which,
because it involved or arose out of any dishonest, fraudulent, criminal,
negligent or knowingly wrongful act, error or omission by the Mortgagor,
originator (or assignee thereof) of such Mortgage Loan, Lender, a Servicer or
the Master Servicer, would result in an exclusion from, denial of, or defense to
coverage which otherwise would be provided by a Primary Insurance Policy
previously issued with respect to such Mortgage Loan.

     GROUP C-B CERTIFICATES: The Class C-B-1, Class C-B-2, Class C-B-3, 
Class C-B-4, Class C-B-5 and Class C-B-6 Certificates.

     GROUP C-B LOAN GROUP COMPONENT BALANCE: With respect to Loan Group I, Loan
Group II or Loan Group IV as of any date of determination, the outstanding
aggregate Principal Balance of the Mortgage Loans in the applicable Loan Group
minus the then outstanding Class Principal Balance of the Senior Certificates
that are Group I, Group II or Group IV Certificates, as applicable.

     GROUP C-B PERCENTAGE: As of any date of determination, the aggregate Class
Principal Balance of the Group C-B Certificates divided by the then outstanding
aggregate Principal Balance of the Group I Loans, the Group II Loans and the
Group IV Loans.

     GROUP C-B SUBORDINATE LIQUIDATION AMOUNT: The excess, if any, of the
aggregate of Liquidation Principal for all Group I Loans, Group II Loans and
Group IV Loans which became Liquidated Mortgage Loans during the Prior Period,
over the sum of the Group I Senior Liquidation Amount, the Group II Senior
Liquidation Amount and the Group IV Senior Liquidation Amount for such
Distribution Date.

     GROUP C-B SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT: On any Distribution
Date, the excess of (A) the sum of (i) the Group I Subordinate Percentage of the
Principal Payment Amount 

                                          35
<PAGE>

for Loan Group I (exclusive of the portion thereof attributable to principal 
distributions to the Class I-P Certificates pursuant to clause (I)(a)(i) of 
the definition of "REMIC II Distribution Amount"), (ii) the Group II 
Subordinate Percentage of the Principal Payment Amount for Loan Group II 
(exclusive of the portion thereof attributable to principal distributions to 
the Class II-P Certificates pursuant to clause (I)(b)(i) of the definition of 
"REMIC II Distribution Amount"), (iii) the Group IV Subordinate Percentage of 
the Principal Payment Amount for Loan Group IV (exclusive of the portion 
thereof attributable to principal distributions to the Class IV-P 
Certificates pursuant to clause (I)(c)(i) of the definition of "REMIC II 
Distribution Amount"), (iv) the Group I Subordinate Principal Prepayments 
Distribution Amount, (v) the Group II Subordinate Principal Prepayments 
Distribution Amount, (vi) the Group IV Subordinate Principal Prepayments 
Distribution Amount, and (vii) the Group C-B Subordinate Liquidation Amount 
over (B) the sum of (x) the amounts required to be distributed to the Class 
I-P, Class II-P and Class IV-P Certificates pursuant to clauses (I)(d)(i) and 
(I)(d)(ii) of the definition of "REMIC II Distribution Amount" on such 
Distribution Date, (y) in the event that the aggregate Class Principal 
Balance of one or more of the Class I-A-1, Class II-A-1 or Group IV-A 
Certificates has been reduced to zero, principal paid from the REMIC II 
Available Distribution Amount of the Loan Group or Groups related to the 
Class A Certificates whose Class Principal Balance has been reduced to zero 
to the remaining Class A Certificates of the other Certificate Group or 
Groups as set forth in clause (X) of the last sentence of paragraph (I)(d) of 
the definition of "REMIC II Distribution Amount" and (z) the amounts in 
respect of principal paid from the REMIC II Available Distribution Amount of 
any Overcollateralized Group or Groups to any Undercollateralized Group or 
Groups pursuant to clause (Y) of the last sentence of paragraph (I)(d) of the 
definition of "REMIC II Distribution Amount".  Any reduction in the Group C-B 
Subordinate Principal Distribution Amount pursuant to clause (B) of this 
definition shall offset: (i) first, the amount calculated pursuant to clause 
(A)(i), (A)(ii) and (A)(iii) of this definition, pro rata, (ii) second, the 
amount calculated pursuant to clause (A)(vii) of this definition and (iii) 
third, the amount calculated pursuant to clause (A)(iv), (A)(v) and (A)(vi) 
of this definition, pro rata. On any Distribution Date, the Group C-B 
Subordinate Principal Distribution Amount shall be allocated pro rata, by 
Class Principal Balance, among the Classes of Group C-B Certificates and paid 
in the order of distribution to such Classes pursuant to clause (I)(d) of the 
definition of "REMIC II Distribution Amount", except as otherwise stated in 
such definition. Notwithstanding the foregoing, on any Distribution Date 
prior to distributions on such date, if the Subordination Level for any Class 
of Group C-B Certificates, as applicable, is less than such percentage as of 
the Closing Date, the pro rata portion of the Group C-B Subordinate Principal 
Prepayments Distribution Amount otherwise allocable to the Class or Classes 
junior to such Class will be distributed to the most senior Class of the 
Group C-B Certificates for which the Subordination Level is less than such 
percentage as of the Closing Date, and to the Classes of Group C-B 
Certificates senior thereto, pro rata according to the Class Principal 
Balances of such Classes. For purposes of this definition and the definition 
of "Subordination Level", the relative seniority, from highest to lowest, of 
the Group C-B Certificates shall be as follows: Class C-B-1, Class C-B-2, 
Class C-B-3, Class C-B-4, Class C-B-5 and Class C-B-6.

     GROUP I CERTIFICATES: The Class I-A-1, Class I-P and Class I-X
Certificates.

     GROUP I LOANS:  The Mortgage Loans designated on the Mortgage Loan Schedule
as Group I Loans.

                                          36
<PAGE>

     GROUP I PREMIUM RATE MORTGAGE LOANS:  The Group I Loans having Pass-Through
Rates in excess of 7.000% per annum.

     GROUP I SENIOR LIQUIDATION AMOUNT: The aggregate, for each Group I Loan
which became a Liquidated Mortgage Loan during the Prior Period, of the lesser
of: (i) the Group I Senior Percentage of the Principal Balance of such Mortgage
Loan (exclusive of the Class I-P Fraction thereof, with respect to any Class I-P
Mortgage Loan), and (ii) the Group I Senior Prepayment Percentage of the
Liquidation Principal with respect to such Mortgage Loan.

     GROUP I SENIOR PERCENTAGE: With respect to any Distribution Date, the
lesser of (a) 100% and (b) the Class I-A-1 Principal Balance divided by the
aggregate Principal Balance of the Group I Loans (less the Class I-P Principal
Balance), in each case immediately prior to the Distribution Date. 

     GROUP I SENIOR PREPAYMENT PERCENTAGE, GROUP II SENIOR PREPAYMENT PERCENTAGE
OR GROUP IV SENIOR PREPAYMENT PERCENTAGE: (i) On any Distribution Date occurring
before the Distribution Date in the month of the fifth anniversary of the first
Distribution Date, the Group I Senior Prepayment Percentage, the Group II Senior
Prepayment Percentage and the Group IV Senior Prepayment Percentage shall equal
100%; (ii) on any other Distribution Date on which the Group I Senior Percentage
for such Distribution Date exceeds the Group I Senior Percentage as of the
Closing Date, the Group II Senior Percentage for such Distribution Date exceeds
the Group II Senior Percentage as of the Closing Date or the Group IV Senior
Percentage for such Distribution Date exceeds the Group IV Senior Percentage as
of the Closing Date, then the Group I Senior Prepayment Percentage, the Group II
Senior Prepayment Percentage and the Group IV Senior Prepayment Percentage shall
all equal 100%; and (iii) on any other Distribution Date in each of the months
of the fifth anniversary of the first Distribution Date and thereafter,  the
Group I Senior Prepayment Percentage, the Group II Senior Prepayment Percentage
and the Group IV Senior Prepayment Percentage shall equal 100%, unless all of
the following tests specified in clauses (a) through (f) are met with respect to
Loan Group I, Loan Group II and Loan Group IV:

     (a)  the mean aggregate Principal Balance of the Group I Loans which are 60
          or more days delinquent (including loans in foreclosure and property
          held by the REMIC I Trust Fund) for each of the immediately preceding
          six calendar months is less than or equal to 50% of the related Group
          C-B Loan Group Component Balance as of such Distribution Date,

     (b)  the mean aggregate Principal Balance of the Group II Loans which are
          60 or more days delinquent (including loans in foreclosure and
          property held by the REMIC I Trust Fund) for each of the immediately
          preceding six calendar months is less than or equal to 50% of the
          related Group C-B Loan Group Component Balance as of such Distribution
          Date,

     (c)  the mean aggregate Principal Balance of the Group IV Loans which are
          60 or more days delinquent (including loans in foreclosure and
          property held by the REMIC I Trust Fund) for each of the immediately
          preceding six calendar months is 

                                          37
<PAGE>

          less than or equal to 50% of the related Group C-B Loan Group
          Component Balance as of such Distribution Date,

     (d)  cumulative Realized Losses on the Group I Loans allocated to the Group
          C-B Certificates is less than or equal to (1) for any Distribution
          Date before the month of the sixth anniversary of the month of the
          first Distribution Date, 30% of the related Group C-B Loan Group
          Component Balance as of the Closing Date, (2) for any Distribution
          Date in or after the month of the sixth anniversary of the month of
          the first Distribution Date but before the seventh anniversary of the
          month of the first Distribution Date, 35% of the related Group C-B
          Loan Group Component Balance as of the Closing Date, (3) for any
          Distribution Date in or after the month of the seventh anniversary of
          the month of the first Distribution Date but before the eighth
          anniversary of the month of the first Distribution Date, 40% of the
          related Group C-B Loan Group Component Balance as of the Closing Date,
          (4) for any Distribution Date in or after the month of the eighth
          anniversary of the month of the first Distribution Date but before the
          ninth anniversary of the month of the first Distribution Date, 45% of
          the related Group C-B Loan Group Component Balance as of the Closing
          Date, and (5) for any Distribution Date in or after the month of the
          ninth anniversary of the month of the first Distribution Date, 50% of
          the related Group C-B Loan Group Component Balance as of the Closing
          Date,

     (e)  cumulative Realized Losses on the Group II Loans allocated to the
          Group C-B Certificates is less than or equal to (1) for any
          Distribution Date before the month of the sixth anniversary of the
          month of the first Distribution Date, 30% of the related Group C-B
          Loan Group Component Balance as of the Closing Date, (2) for any
          Distribution Date in or after the month of the sixth anniversary of
          the month of the first Distribution Date but before the seventh
          anniversary of the month of the first Distribution Date, 35% of the
          related Group C-B Loan Group Component Balance as of the Closing Date,
          (3) for any Distribution Date in or after the month of the seventh
          anniversary of the month of the first Distribution Date but before the
          eighth anniversary of the month of the first Distribution Date, 40% of
          the related Group C-B Loan Group Component Balance as of the Closing
          Date, (4) for any Distribution Date in or after the month of the
          eighth anniversary of the month of the first Distribution Date but
          before the ninth anniversary of the month of the first Distribution
          Date, 45% of the related Group C-B Loan Group Component Balance as of
          the Closing Date, and (5) for any Distribution Date in or after the
          month of the ninth anniversary of the month of the first Distribution
          Date, 50% of the related Group C-B Loan Group Component Balance as of
          the Closing Date, and

     (f)  cumulative Realized Losses on the Group IV Loans allocated to the
          Group C-B Certificates is less than or equal to (1) for any
          Distribution Date before the month of the sixth anniversary of the
          month of the first Distribution Date, 30% of the related Group C-B
          Loan Group Component Balance as of the Closing Date, (2) for any
          Distribution Date in or after the month of the sixth anniversary of
          the 

                                          38
<PAGE>

          month of the first Distribution Date but before the seventh
          anniversary of the month of the first Distribution Date, 35% of the
          related Group C-B Loan Group Component Balance as of the Closing Date,
          (3) for any Distribution Date in or after the month of the seventh
          anniversary of the month of the first Distribution Date but before the
          eighth anniversary of the month of the first Distribution Date, 40% of
          the related Group C-B Loan Group Component Balance as of the Closing
          Date, (4) for any Distribution Date in or after the month of the
          eighth anniversary of the month of the first Distribution Date but
          before the ninth anniversary of the month of the first Distribution
          Date, 45% of the related Group C-B Loan Group Component Balance as of
          the Closing Date, and (5) for any Distribution Date in or after the
          month of the ninth anniversary of the month of the first Distribution
          Date, 50% of the related Group C-B Loan Group Component Balance as of
          the Closing Date,

in which case, as follows: (1) for any such Distribution Date in or after the
month of the fifth anniversary of the month of the first Distribution Date but
before the sixth anniversary of the month of the first Distribution Date, the
Group I Senior Percentage, the Group II Senior Percentage or the Group IV Senior
Percentage, as applicable, for such Distribution Date plus 70% of the
Subordinate Percentage for the related Loan Group for such Distribution Date;
(2) for any such Distribution Date in or after the month of the sixth
anniversary of the month of the first Distribution Date but before the seventh
anniversary of the month of the first Distribution Date, the Group I Senior
Percentage, the Group II Senior Percentage or the Group IV Senior Percentage, as
applicable, for such Distribution Date plus 60% of the Subordinate Percentage
for the related Loan Group for such Distribution Date; (3) for any such
Distribution Date in or after the month of the seventh anniversary of the month
of the first Distribution Date but before the eighth anniversary of the month of
the first Distribution Date, the Group I Senior Percentage, the Group II Senior
Percentage or the Group IV Senior Percentage, as applicable, for such
Distribution Date plus 40% of the Subordinate Percentage for the related Loan
Group for such Distribution Date; (4) for any such Distribution Date in or after
the month of the eighth anniversary of the month of the first Distribution Date
but before the ninth anniversary of the month of the first Distribution Date,
the Group I Senior Percentage, the Group II Senior Percentage or the Group IV
Senior Percentage, as applicable, for such Distribution Date plus 20% of the
Subordinate Percentage for the related Loan Group for such Distribution Date;
and (5) for any such Distribution Date thereafter, the Group I Senior
Percentage, the Group II Senior Percentage or the Group IV Senior Percentage, as
applicable, for such Distribution Date.

     If on any Distribution Date the allocation to the Group I Certificates, the
Group II Certificates or the Group IV Certificates (other than the related Class
P Certificates) of Principal Prepayments in the percentage required would reduce
the sum of the Class Principal Balances of such Certificates below zero, the
Group I Senior Prepayment Percentage, the Group II Senior Prepayment Percentage
or the Group IV Senior Prepayment Percentage, as applicable, for such
Distribution Date shall be limited to the percentage necessary to reduce such
sum to zero. Notwithstanding the foregoing, however, on each Distribution Date,
the related Class P Certificates will receive the related Class P Fraction of
all principal payments, including, without limitation, Principal Prepayments,
received in respect of each Class I-P, Class II-P or Class IV-P Mortgage Loan,
as applicable.

                                          39
<PAGE>

     GROUP I SENIOR PRINCIPAL DISTRIBUTION AMOUNT: For any Distribution Date, an
amount equal to the sum of (a) the Group I Senior Percentage of the Principal
Payment Amount for Loan Group I (exclusive of the portion thereof attributable
to principal distributions to the Class I-P Certificates pursuant to clauses
(I)(a)(i) and (II)(a)(i) of the definition of "REMIC II Distribution Amount"),
(b) the Group I Senior Prepayment Percentage of the Principal Prepayment Amount
for Loan Group I (exclusive of the portion thereof attributable to principal
distributions to the Class I-P Certificates pursuant to clauses (I)(a)(i) and
(II)(a)(i) of the definition of "REMIC II Distribution Amount") and (c) the
Group I Senior Liquidation Amount.

     GROUP I SUBORDINATE PERCENTAGE: With respect to any Distribution Date, the
excess of 100% over the Group I Senior Percentage for such date.

     GROUP I SUBORDINATE PREPAYMENT PERCENTAGE: On any Distribution Date for
Loan Group I, the excess of 100% over the Group I Senior Prepayment Percentage
for such Distribution Date; provided, however, that if the Class I-A-1 Principal
Balance has been reduced to zero, then the Group I Subordinate Prepayment
Percentage shall equal 100%.

     GROUP I SUBORDINATE PRINCIPAL PREPAYMENTS DISTRIBUTION AMOUNT: On any
Distribution Date, the Group I Subordinate Prepayment Percentage of the
Principal Prepayment Amount for Loan Group I (exclusive of the portion thereof
attributable to principal distributions to the Class I-P Certificates pursuant
to clause (I)(a)(i) of the definition of "REMIC II Distribution Amount").

     GROUP II CERTIFICATES: The Class II-A-1, Class II-X and Class II-P
Certificates.

     GROUP II PREMIUM RATE MORTGAGE LOANS:  The Subgroup II-1 Premium Rate
Mortgage Loans and the Subgroup II-2 Premium Rate Mortgage Loans.

     GROUP II LOANS:  The Mortgage Loans designated on the Mortgage Loan
Schedule as Group II Loans.

     GROUP II SENIOR LIQUIDATION AMOUNT: The aggregate, for each Group II Loan
which became a Liquidated Mortgage Loan during the Prior Period, of the lesser
of (i) the Group II Senior Percentage of the Principal Balance of such Mortgage
Loan (exclusive of the Class II-P Fraction thereof, with respect to any Class
II-P Mortgage Loan), and (ii) the Group II Senior Prepayment Percentage of the
Liquidation Principal with respect to such Mortgage Loan.

     GROUP II SENIOR PERCENTAGE: With respect to any Distribution Date, the
lesser of (a) 100% and (b) the Class II-A-1 Principal Balance divided by the
aggregate Principal Balance of the Group II Loans (less the Class II-P Principal
Balance), in each case immediately prior to the Distribution Date. 

     GROUP II SENIOR PRINCIPAL DISTRIBUTION AMOUNT: For any Distribution Date,
an amount equal to the sum of (a) the Group II Senior Percentage of the
Principal Payment Amount for Loan Group II (exclusive of the portion thereof
attributable to principal distributions to the Class II-P Certificates pursuant
to clauses (I)(b)(i) and (II)(b)(i) of the definition of "REMIC II Distribution
Amount"), (b) the Group II Senior Prepayment Percentage of the Principal
Prepayment Amount for Loan Group II (exclusive of the portion thereof
attributable to principal distributions to the 

                                          40
<PAGE>

Class II-P Certificates pursuant to clauses (I)(b)(i) and (II)(b)(i) of the
definition of "REMIC II Distribution Amount") and (c) the Group II Senior
Liquidation Amount.

     GROUP II SUBORDINATE PERCENTAGE: With respect to any Distribution Date, the
excess of 100% over the Group II Senior Percentage for such date.

     GROUP II SUBORDINATE PREPAYMENT PERCENTAGE: On any Distribution Date for
Loan Group II, the excess of 100% over the Group II Senior Prepayment Percentage
for such Distribution Date; provided, however, that if the Class II-A-1
Principal Balance has been reduced to zero, then the Group II Subordinate
Prepayment Percentage shall equal 100%.

     GROUP II SUBORDINATE PRINCIPAL PREPAYMENTS DISTRIBUTION AMOUNT: On any
Distribution Date, the Group II Subordinate Prepayment Percentage of the
Principal Prepayment Amount for Loan Group II (exclusive of the portion thereof
attributable to principal distributions to the Class II-P Certificates pursuant
to clause (I)(b)(i) of the definition of "REMIC II Distribution Amount").

     GROUP III ADJUSTED LOCKOUT PERCENTAGE:  For any Distribution Date occurring
prior to the Distribution Date in May 2003, 0%, and for the May 2003
Distribution Date and any Distribution Date thereafter, the Group III Lockout
Percentage.

     GROUP III BANKRUPTCY COVERAGE: With respect to Loan Group III, the
Bankruptcy Coverage Initial Amount for such Loan Group less (a) any scheduled or
permissible reduction in the amount of the Group III Bankruptcy Coverage
pursuant to this definition and (b) Bankruptcy Losses allocated to the Group III
Certificates since the Cut-Off Date. The Group III Bankruptcy Coverage may be
reduced upon written confirmation from the Rating Agencies that such reduction
will not adversely affect the then current ratings assigned to the Group III
Certificates by the Rating Agencies.

     GROUP III CERTIFICATES: The Group III-A, Class III-X, Class III-P and Group
III-B Certificates.

     GROUP III-A CERTIFICATES: The Class III-A-1, Class III-A-2, Class III-A-3,
Class III-A-4, Class III-A-5, Class III-A-6, Class III-A-7, Class III-A-8, Class
III-A-9, Class III-A-10, Class III-A-11, Class III-A-12, Class III-A-13, Class
III-A-14, Class III-A-15, Class III-A-16, Class III-A-17 and Class III-A-18
Certificates.

     GROUP III-B CERTIFICATES: The Class III-B-1, Class III-B-2, Class III-B-3,
Class III-B-4, Class III-B-5 and Class III-B-6 Certificates.

     GROUP III-X CERTIFICATES: The Class III-X-1 and Class III-X-2 Certificates.

     GROUP III-X-L REGULAR INTERESTS: The Class III-X-1-L and Class III-X-2-L
Regular Interests.

     GROUP III CREDIT SUPPORT DEPLETION DATE: The first Distribution Date on
which the aggregate Class Principal Balance of the Group III-B Certificates has
been or will be reduced to 

                                          41
<PAGE>

zero as a result of principal distributions thereon and the allocation of
Realized Losses on such Distribution Date.

     GROUP III FRAUD COVERAGE: During the period prior to the first anniversary
of the Cut-Off Date and with respect to Loan Group III, the Fraud Coverage
Initial Amount for such Loan Group reduced by Fraud Losses allocated to the
Group III Certificates, and during the period from the first anniversary of the
Cut-Off Date to (but not including) the fifth anniversary of the Cut-Off Date,
the amount of the Group III Fraud Coverage on the most recent previous
anniversary of the Cut-Off Date (calculated in accordance with the second
sentence of this definition) reduced by Fraud Losses allocated to the Group III
Certificates since such anniversary; and during the period on and after the
fifth anniversary of the Cut-Off Date, the Group III Fraud Coverage shall be
zero. On each anniversary of the Cut-Off Date, the Group III Fraud Coverage
shall be reduced to the lesser of (i) on the first and second anniversaries of
the Cut-Off Date, 1.00% and on the third and fourth anniversaries of the Cut-Off
Date, 0.50% of the aggregate principal balance of the Group III Loans as of the
Due Date in the preceding month and (ii) the excess of the Fraud Coverage
Initial Amount for Loan Group III over cumulative Fraud Losses allocated to the
Group III Certificates since the Cut-Off Date. The Group III Fraud Coverage may
be reduced upon written confirmation from the Rating Agencies that such
reduction will not adversely affect the then current ratings assigned to the
Group III Certificates by the Rating Agencies.

     GROUP III LOANS:  The Mortgage Loans designated on the Mortgage Loan
Schedule as Group III Loans.

     GROUP III LOCKOUT LIQUIDATION AMOUNT: The aggregate, for each Group III
Loan which became a Liquidated Mortgage Loan during the calendar month preceding
the month of the Distribution Date, of the lesser of (i) the Group III Lockout
Percentage of the Principal Balance of such Mortgage Loan (exclusive of the
Class III-P Fraction thereof, with respect to any Class III-P Mortgage Loan) and
(ii) the Group III Lockout Percentage on any Distribution Date occurring prior
to the fifth anniversary of the first Distribution Date, and the Group III
Lockout Prepayment Percentage on the fifth anniversary of the first Distribution
Date and each Distribution Date thereafter, in each case, of the Liquidation
Principal with respect to such Mortgage Loan.
     
     GROUP III LOCKOUT PERCENTAGE: For any Distribution Date, the aggregate
Class Principal Balance of the Class III-A-4, Class III-A-6, Class III-A-7 and
Class III-A-12 Certificates divided by the aggregate Class Principal Balance of
the Group III Certificates (less the Class III-P Principal Balance), in each
case immediately prior to such Distribution Date.

     GROUP III LOCKOUT PREPAYMENT PERCENTAGE: For any Distribution Date, the
product of the Group III Lockout Percentage and the Step Down Percentage.

     GROUP III LOCKOUT PRINCIPAL DISTRIBUTION AMOUNT: For any Distribution Date,
the sum of (i) the Group III Adjusted Lockout Percentage of the Principal
Payment Amount for Loan Group III (exclusive of the portion thereof attributable
to principal distributions to the Class III-P Certificates pursuant to clauses
(I)(c)(i) of the definition of "REMIC II Distribution Amount"), 

                                          42
<PAGE>

(ii) the Group III Lockout Prepayment Percentage of the Principal Prepayment
Amount for Loan Group III and (iii) the Group III Lockout Liquidation Amount.

     GROUP III SENIOR CERTIFICATES: The Group III-A, Class III-X and Class III-P
Certificates.

     GROUP III SENIOR LIQUIDATION AMOUNT: The aggregate, for each Group III Loan
which became a Liquidated Mortgage Loan during the Prior Period, of the lesser
of: (i) the Group III Senior Percentage of the Principal Balance of such
Mortgage Loan (exclusive of the Class III-P Fraction thereof, with respect to
any Class III-P Mortgage Loan), and (ii) the Group III Senior Prepayment
Percentage of the Liquidation Principal with respect to such Mortgage Loan.

     GROUP III SENIOR PERCENTAGE: With respect to any Distribution Date, the
lesser of (i) 100% and (ii) the aggregate Class Principal Balance of the Group
III-A Certificates divided by the aggregate Principal Balance of the Group III
Loans (less the Class III-P Principal Balance), in each case immediately prior
to the Distribution Date. 

     GROUP III SENIOR PREPAYMENT PERCENTAGE: (i) On any Distribution Date
occurring before the Distribution Date in the month of the fifth anniversary of
the first Distribution Date, 100%; (ii) on any other Distribution Date on which
the Group III Senior Percentage for such Distribution Date exceeds the Group III
Senior Percentage as of the Closing Date, 100%; and (iii) on any other
Distribution Date in each of the months of the fifth anniversary of the first
Distribution Date and thereafter, 100%, unless:

     (a)  the mean aggregate Principal Balance of Group III Loans which are 60
          or more days delinquent (including loans in foreclosure and property
          held by the REMIC I Trust Fund) for each of the immediately preceding
          six calendar months is less than or equal to 50% of the aggregate
          Class Principal Balance of the Group III-B Certificates as of such
          Distribution Date, and

     (b)  cumulative Realized Losses on the Group III Loans allocated to the
          Group III-B Certificates is less than or equal to (1) for any
          Distribution Date before the month of the sixth anniversary of the
          month of the first Distribution Date, 30% of the sum of the Class
          Principal Balances of the Group III-B Certificates as of the Closing
          Date, (2) for any Distribution Date in or after the month of the sixth
          anniversary of the month of the first Distribution Date but before the
          seventh anniversary of the month of the first Distribution Date, 35%
          of the sum of the Class Principal Balances of the Group III-B
          Certificates as of the Closing Date, (3) for any Distribution Date in
          or after the month of the seventh anniversary of the month of the
          first Distribution Date but before the eighth anniversary of the month
          of the first Distribution Date, 40% of the sum of the Class Principal
          Balances of the Group III-B Certificates as of the Closing Date, (4)
          for any Distribution Date in or after the month of the eighth
          anniversary of the month of the first Distribution Date but before the
          ninth anniversary of the month of the first Distribution Date, 45% of
          the sum of the Class Principal Balances of the Group III-B
          Certificates as of the Closing Date, and (5) for any Distribution Date
          in or after the month of the ninth 

                                          43
<PAGE>

          anniversary of the month of the first Distribution Date, 50% of the
          sum of the Class Principal Balances of the Group III-B Certificates as
          of the Closing Date,

in which case, as follows: (1) for any such Distribution Date in or after the
month of the fifth anniversary of the month of the first Distribution Date but
before the sixth anniversary of the month of the first Distribution Date, the
Group III Senior Percentage for such Distribution Date plus 70% of the Group III
Subordinate Percentage for such Distribution Date; (2) for any such Distribution
Date in or after the month of the sixth anniversary of the month of the first
Distribution Date but before the seventh anniversary of the month of the first
Distribution Date, the Group III Senior Percentage for such Distribution Date
plus 60% of the Group III Subordinate Percentage for such Distribution Date; (3)
for any such Distribution Date in or after the month of the seventh anniversary
of the month of the first Distribution Date but before the eighth anniversary of
the month of the first Distribution Date, the Group III Senior Percentage for
such Distribution Date plus 40% of the Group III Subordinate Percentage for such
Distribution Date; (4) for any such Distribution Date in or after the month of
the eighth anniversary of the month of the first Distribution Date but before
the ninth anniversary of the month of the first Distribution Date, the Group III
Senior Percentage for such Distribution Date plus 20% of the Group III
Subordinate Percentage for such Distribution Date; and (5) for any such
Distribution Date thereafter, the Group III Senior Percentage for such
Distribution Date.

     If on any Distribution Date the allocation to the Group III Senior
Certificates (other than the Class III-P Certificates) of Principal Prepayments
in the percentage required would reduce the sum of the Class Principal Balances
of such Certificates below zero, the Group III Senior Prepayment Percentage for
such Distribution Date shall be limited to the percentage necessary to reduce
such sum to zero. Notwithstanding the foregoing, however, on each Distribution
Date, the Class III-P Certificates will receive the Class III-P Fraction of all
principal payments, including, without limitation, Principal Prepayments,
received in respect of each Class III-P Mortgage Loan.

     GROUP III SENIOR PRINCIPAL DISTRIBUTION AMOUNT: For any Distribution Date,
an amount equal to the sum of (a) the Group III Senior Percentage of the
Principal Payment Amount for Loan Group III (exclusive of the portion thereof
attributable to principal distributions to the Class III-P Certificates pursuant
to clauses (I)(e)(i) and (II)(c)(i) of the definition of "REMIC II Distribution
Amount"), (b) the Group III Senior Prepayment Percentage of the Principal
Prepayment Amount for Loan Group III (exclusive of the portion thereof
attributable to principal distributions to the Class III-P Certificates pursuant
to clauses (I)(e)(i) and (II)(c)(i) of the definition of "REMIC II Distribution
Amount") and (c) the Group III Senior Liquidation Amount.

     GROUP III SPECIAL HAZARD COVERAGE: With respect to Loan Group III, the
Special Hazard Coverage Initial Amount for such Loan Group less Special Hazard
Losses allocated to the Group III Certificates and the amount of any scheduled
reduction in the amount of Group III Special Hazard Coverage as follows: on each
anniversary of the Cut-Off Date, the Group III Special Hazard Coverage shall be
reduced, but not increased, to an amount equal to the lesser of (i) the greatest
of (a) the aggregate principal balance of the Group III Loans located in the
single California zip code area containing the largest aggregate principal
balance of such Mortgage Loans, (b) 1% of the aggregate unpaid principal balance
of the Group III Loans and (c) twice the unpaid principal balance of the largest
single Group III Loan, in each case calculated as of the 

                                          44
<PAGE>

Due Date in the immediately preceding month, and (ii) the Special Hazard
Coverage Initial Amount for Loan Group III as reduced by the Special Hazard
Losses allocated to the Group III Certificates since the Cut-Off Date. The Group
III Special Hazard Coverage may be reduced upon written confirmation from the
Rating Agencies that such reduction will not adversely affect the then current
ratings assigned to the Certificates by the Rating Agencies.

     GROUP III SUBORDINATE LIQUIDATION AMOUNT: The excess, if any, of the
aggregate of Liquidation Principal for all Group III Loans which became
Liquidated Mortgage Loans during the Prior Period, over the related Group III
Senior Liquidation Amount for such Distribution Date.

     GROUP III SUBORDINATE PERCENTAGE: With respect to any Distribution Date,
the excess of 100% over the Group III Senior Percentage for such date.

     GROUP III SUBORDINATE PREPAYMENT PERCENTAGE: On any Distribution Date for
Loan Group III, the excess of 100% over the Group III Senior Prepayment
Percentage for such Distribution Date; provided, however, that if the aggregate
Class Principal Balance of the Group III-A Certificates has been reduced to
zero, then the Group III Subordinate Prepayment Percentage shall equal 100%.

     GROUP III SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT: On any Distribution
Date, the excess of (A) the sum of (i) the Group III Subordinate Percentage of
the Principal Payment Amount for Loan Group III (exclusive of the portion
thereof attributable to principal distributions to the Class III-P Certificates
pursuant to clause (I)(e)(i) of the definition of "REMIC II Distribution
Amount"), (ii) the Group III Subordinate Principal Prepayments Distribution
Amount and (iii) the Group III Subordinate Liquidation Amount over (B) the
amounts required to be distributed to the Class III-P Certificates pursuant to
clauses (I)(e)(v) and (I)(e)(vi) of the definition of "REMIC II Distribution
Amount" on such Distribution Date.  Any reduction in the Group III Subordinate
Principal Distribution Amount pursuant to clause (B) of this definition shall
offset: first, the amount calculated pursuant to clause (A)(i) of this
definition,  second, the amount calculated pursuant to clause (A)(iii) of this
definition and third, the amount calculated pursuant to clause (A)(ii) of this
definition. On any Distribution Date, the Group III Subordinate Principal
Distribution Amount shall be allocated pro rata, by Class Principal Balance,
among the Classes of Group III-B Certificates and paid in the order of
distribution to such Classes pursuant to clause (I)(e) of the definition of
"REMIC II Distribution Amount", except as otherwise stated in such definition.
Notwithstanding the foregoing, on any Distribution Date prior to distributions
on such date, if the Subordination Level for any Class of Group III-B
Certificates is less than such percentage as of the Closing Date, the pro rata
portion of the Group III Subordinate Principal Prepayments Distribution Amount
otherwise allocable to the Class or Classes junior to such Class will be
distributed to the most senior Class of the Group III-B Certificates for which
the Subordination Level is less than such percentage as of the Closing Date, and
to the Classes of Group III-B Certificates senior thereto, pro rata according to
the Class Principal Balances of such Classes. For purposes of this definition
and the definition of "Subordination Level", the relative seniority, from
highest to lowest, of the Group III-B Certificates shall be as follows: Class
III-B-1, Class III-B-2, Class III-B-3, Class III-B-4, Class III-B-5 and Class
III-B-6.

                                          45
<PAGE>

     GROUP III SUBORDINATE PRINCIPAL PREPAYMENTS DISTRIBUTION AMOUNT: On any
Distribution Date, the Group III Subordinate Prepayment Percentage of the
Principal Prepayment Amount for Loan Group III (exclusive of the portion thereof
attributable to principal distributions to the Class III-P Certificates pursuant
to clause (I)(e)(i) of the definition of "REMIC II Distribution Amount").

     GROUP IV CERTIFICATES: The Group IV-A, Class IV-P and Class IV-X 
Certificates.

     GROUP IV-A CERTIFICATES: The Class IV-A-1 and Class IV-A-2 Certificates.

     GROUP IV LOANS:  The Mortgage Loans designated on the Mortgage Loan 
Schedule as Group IV Loans.

     GROUP IV PREMIUM RATE MORTGAGE LOANS:  The Group IV Loans having 
Pass-Through Rates in excess of 6.750% per annum.

     GROUP IV SENIOR LIQUIDATION AMOUNT: The aggregate, for each Group IV Loan
which became a Liquidated Mortgage Loan during the Prior Period, of the lesser
of: (i) the Group IV Senior Percentage of the Principal Balance of such Mortgage
Loan (exclusive of the Class IV-P Fraction thereof, with respect to any Class
IV-P Mortgage Loan), and (ii) the Group IV Senior Prepayment Percentage of the
Liquidation Principal with respect to such Mortgage Loan.

     GROUP IV SENIOR PERCENTAGE: With respect to any Distribution Date, the
lesser of (a) 100% and (b) the aggregate Class Principal Balance of the Group
IV-A and Residual Certificates divided by the aggregate Principal Balance of the
Group IV Loans (less the Class IV-P Principal Balance), in each case immediately
prior to the Distribution Date. 

     GROUP IV SENIOR PRINCIPAL DISTRIBUTION AMOUNT: For any Distribution Date,
an amount equal to the sum of (a) the Group IV Senior Percentage of the
Principal Payment Amount for Loan Group IV (exclusive of the portion thereof
attributable to principal distributions to the Class IV-P Certificates pursuant
to clauses (I)(c)(i) and (II)(d)(i) of the definition of "REMIC II Distribution
Amount"), (b) the Group IV Senior Prepayment Percentage of the Principal
Prepayment Amount for Loan Group IV (exclusive of the portion thereof
attributable to principal distributions to the Class IV-P Certificates pursuant
to clauses (I)(c)(i) and (II)(d)(i) of the definition of "REMIC II Distribution
Amount") and (c) the Group IV Senior Liquidation Amount.

     GROUP IV SUBORDINATE PERCENTAGE: With respect to any Distribution Date, the
excess of 100% over the Group IV Senior Percentage for such date.

     GROUP IV SUBORDINATE PREPAYMENT PERCENTAGE: On any Distribution Date for
Loan Group IV, the excess of 100% over the Group IV Senior Prepayment Percentage
for such Distribution Date; provided, however, that if the aggregate Class
Principal Balance of the Group IV-A and Residual Certificates has been reduced
to zero, then the Group IV Subordinate Prepayment Percentage shall equal 100%.

     GROUP IV SUBORDINATE PRINCIPAL PREPAYMENTS DISTRIBUTION AMOUNT: On any
Distribution Date, the Group IV Subordinate Prepayment Percentage of the
Principal Prepayment Amount for 

                                          46
<PAGE>

Loan Group IV (exclusive of the portion thereof attributable to principal
distributions to the Class IV-P Certificates pursuant to clause (I)(c)(i) of the
definition of "REMIC II Distribution Amount").

     INDIRECT DTC PARTICIPANTS: Entities such as banks, brokers, dealers or
trust companies, that clear through or maintain a custodial relationship with a
DTC Participant, either directly or indirectly.

     INSURANCE PROCEEDS: Amounts paid or payable by the insurer under any
Primary Insurance Policy or any other insurance policy (including any
replacement policy permitted under this Agreement), covering any Mortgage Loan
or Mortgaged Property, including, without limitation, any hazard insurance
policy required pursuant to Section 3.07, any title insurance policy required
pursuant to Section 2.03, and any FHA insurance policy or VA guaranty.

     INTEREST DISTRIBUTION AMOUNT: On any Distribution Date, for any Class of 
Certificates or any Class of REMIC I Regular Interests, the amount of 
interest accrued on the respective Class Principal Balance or Class Notional 
Amount, as applicable, at the related Remittance Rate for such Class during 
the Prior Period, in each case before giving effect to allocations of 
Realized Losses for the Prior Period or distributions to be made on such 
Distribution Date, reduced by Uncompensated Interest Shortfall and the 
interest portion of Realized Losses allocated to such Class pursuant to the 
definitions of "Uncompensated Interest Shortfall" and "Realized Loss", 
respectively; provided, however, that in the case of (i) the Class III-A-11 
Certificates on or before the Class III-A-11 Accretion Termination Date, such 
amount shall be reduced by the Class III-A-11 Accrual Amount, (ii) the Class 
III-A-16 Certificates on or before the Class III-A-16 Accretion Termination 
Date, such amount shall be reduced by the Class III-A-16 Accrual Amount and 
(iii) the Class III-A-17 Certificates on or before the Class III-A-17 
Accretion Termination Date, such amount shall be reduced by the Class 
III-A-17 Accrual Amount.  The Interest Distribution Amount for the Class P 
and Class III-A-10 Certificates and the Class P-L Regular Interests shall 
equal zero.

     INVESTMENT ACCOUNT: The commingled account (which shall be commingled only
with investment accounts related to series of pass-through certificates with a
class of certificates which has a rating equal to the highest of the Ratings of
the Certificates) maintained by the Master Servicer in the trust department of
the Investment Depository pursuant to Section 3.03 and which bears a designation
acceptable to the Rating Agencies.

     INVESTMENT DEPOSITORY: Chemical Bank, New York, New York or another bank or
trust company designated from time to time by the Master Servicer. The
Investment Depository shall at all times be an Eligible Institution.

     JUNIOR SUBORDINATE CERTIFICATE : The Class C-B-4, Class C-B-5, Class C-B-6,
Class III-B-4, Class III-B-5 and Class III-B-6 Certificates.

     LAST SCHEDULED DISTRIBUTION DATE:  With respect to each Class of the REMIC
I Regular Interests and the Certificates, the Distribution Date in the month set
forth in the table contained in the Preliminary Statement hereto.

                                          47
<PAGE>

     LENDER: An institution from which the Company purchased any Mortgage Loans
pursuant to a Selling and Servicing Contract.

     LIQUIDATED MORTGAGE LOAN: A Mortgage Loan as to which the Master Servicer
or the applicable Servicer has determined in accordance with its customary
servicing practices that all amounts which it expects to recover from or on
account of such Mortgage Loan, whether from Insurance Proceeds, Liquidation
Proceeds or otherwise have been recovered. For purposes of this definition,
acquisition of a Mortgaged Property by the REMIC I Trust Fund shall not
constitute final liquidation of the related Mortgage Loan.

     LIQUIDATION PRINCIPAL: The principal portion of Liquidation Proceeds
received (exclusive of the portion thereof attributable to distributions to the
Class P Certificates pursuant to clauses (I)(a)(i), (I)(b)(i), (I)(c)(i),
(I)(e)(i), (II)(a)(i), (II)(b)(i), (II)(c)(i) and (II)(d)(i) of the definition
of "REMIC II Distribution Amount") with respect to each Mortgage Loan which
became a Liquidated Mortgage Loan (but not in excess of the principal balance
thereof) during the Prior Period.

     LIQUIDATION PROCEEDS: Amounts after deduction of amounts reimbursable under
Section 3.05(a)(i) and (ii) received and retained in connection with the
liquidation of defaulted Mortgage Loans, whether through foreclosure or
otherwise, other than Insurance Proceeds.

     LOAN GROUP: Loan Group I, Loan Group II, Loan Group III or Loan Group IV,
as applicable.

     LOAN GROUP I: The group of Mortgage Loans comprised of the Group I Loans.

     LOAN GROUP II: The group of Mortgage Loans comprised of the Group II Loans.

     LOAN GROUP III: The group of Mortgage Loans comprised of the Group III
Loans.

     LOAN GROUP IV: The group of Mortgage Loans comprised of the Group IV Loans.

     LOAN-TO-VALUE RATIO: The original principal amount of a Mortgage Loan
divided by the Original Value; however, references to "current Loan-to-Value
Ratio" shall mean the then current Principal Balance of a Mortgage Loan divided
by the Original Value.

     LOCKOUT CERTIFICATES: The Class III-A-4, Class III-A-6, Class III-A-7 and
Class III-A-12 Certificates.

     MASTER SERVICER:  The Company, or any successor thereto appointed as
provided pursuant to Section 7.02, acting to service and administer the Mortgage
Loans pursuant to Section 3.01.

     MASTER SERVICING FEE: The fee charged by the Master Servicer for
supervising the mortgage servicing and advancing certain expenses, equal to a
per annum rate set forth for each Mortgage Loan in Exhibit D on the outstanding
Principal Balance of such Mortgage Loan, payable monthly from the Certificate
Account, the Investment Account or the Custodial Account for P&I.

                                          48
<PAGE>

     MONTHLY P&I ADVANCE: An advance of funds by the Master Servicer pursuant to
Section 4.02 or a Servicer pursuant to its Selling and Servicing Contract to
cover delinquent principal and interest installments.

     MONTHLY PAYMENT: The scheduled payment of principal and interest on a
Mortgage Loan (including any amounts due from a Buydown Fund, if any) which is
due on the related Due Date for such Mortgage Loan.

     MORTGAGE: The mortgage, deed of trust or other instrument securing a
Mortgage Note.

     MORTGAGED PROPERTY: With respect to any Mortgage Loan, other than a
Cooperative Loan, the real property, together with improvements thereto, and,
with respect to any Cooperative Loan, the related Cooperative Stock and
Cooperative Lease, securing the indebtedness of the Mortgagor under the related
Mortgage Loan.

     MORTGAGE FILE: The following documents or instruments with respect to each
Mortgage Loan transferred and assigned pursuant to Section 2.01, (X) with
respect to each Mortgage Loan that is not a Cooperative Loan:

          (i)       The original Mortgage Note endorsed to "U.S. Bank National
     Association, as Custodian/Trustee, without recourse" or "U.S. Bank National
     Association, as Trustee for the benefit of the Holders from time to time of
     PNC Mortgage Securities Corp. Mortgage Pass-Through Certificates, Series
     1998-4, without recourse" and all intervening endorsements evidencing a
     complete chain of endorsements from the originator to the Trustee, or, in
     the event of any Destroyed Mortgage Note, a copy or a duplicate original of
     the Mortgage Note, together with an original lost note affidavit from the
     originator of the related Mortgage Loan or the Company stating that the
     original Mortgage Note was lost, misplaced or destroyed, together with a
     copy of the related Mortgage Note; in the event the Mortgage Notes or the
     assignments referred to in Section (iii)(2) of this definition of "Mortgage
     File" are endorsed or executed in blank as of the Closing Date, the Company
     shall, within 45 days of the Closing Date, cause such Mortgage Notes or
     assignments to be endorsed or executed pursuant to the terms set forth
     herein;

          (ii)      The Buydown Agreement, if applicable;

          (iii)     A Mortgage that is either 

          (1)  the original recorded Mortgage with recording information thereon
     for the jurisdiction in which the Mortgaged Property is located, together
     with a Mortgage assignment thereof in recordable form to "U.S. Bank
     National Association, as Custodian/Trustee", or to "U.S. Bank National
     Association, as Trustee for the Holders of PNC Mortgage Securities Corp.
     Mortgage Pass-Through Certificates, Series 1998-4" and all intervening
     assignments evidencing a complete chain of assignment, from the originator
     to the name holder or the payee endorsing the related Mortgage Note; or

          (2)  a copy of the Mortgage which represents a true and correct
     reproduction of the original Mortgage and which has either been certified
     (i) on the face thereof by the 

                                          49
<PAGE>

     public recording office in the appropriate jurisdiction in which the
     Mortgaged Property is located, or (ii) by the originator or Lender as a
     true and correct copy the original of which has been sent for recordation
     and an original Mortgage assignment thereof duly executed and acknowledged
     in recordable form to "U.S. Bank National Association, as
     Custodian/Trustee" or to "U.S. Bank National Association, as Trustee for
     the Holders of PNC Mortgage Securities Corp. Mortgage Pass-Through
     Certificates, Series 1998-4" and all intervening assignments evidencing a
     complete chain of assignment from the originator to the name holder or the
     payee endorsing the related Mortgage Note;

          (iv)      A copy of (a) the title insurance policy, or (b) in lieu
     thereof, a title insurance binder, a copy of an attorney's title opinion,
     certificate or other evidence of title acceptable to the Company; and

          (v)       For any Mortgage Loan that has been modified or amended, 
     the original instrument or instruments effecting such modification or
     amendment;

and (Y) with respect to each Cooperative Loan:

          (i)       the original Mortgage Note endorsed to "U.S. Bank National
     Association, as Custodian/Trustee", or to "U.S. Bank National Association,
     as Trustee for the Holders of PNC Mortgage Securities Corp. Mortgage 
     Pass-Through Certificates, Series 1998-4" and all intervening endorsements
     evidencing a complete chain of endorsements, from the originator to the
     Trustee, or, in the event of any Destroyed Mortgage Note, a copy or a
     duplicate original of the Mortgage Note, together with an original lost
     note affidavit from the originator of the related Mortgage Loan or the
     Company stating that the original Mortgage Note was lost, misplaced or
     destroyed, together with a copy of the related Mortgage Note;

          (ii)      A counterpart of the Cooperative Lease and the Assignment of
     Proprietary Lease to the originator of the Cooperative Loan with
     intervening assignments showing an unbroken chain of title from such
     originator to the Trustee;

          (iii)     The related Cooperative Stock Certificate, representing the
     related Cooperative Stock pledged with respect to such Cooperative Loan,
     together with an undated stock power (or other similar instrument) executed
     in blank;

          (iv)      The original recognition agreement by the Cooperative of the
     interests of the mortgagee with respect to the related Cooperative Loan;

          (v)       The Security Agreement;

          (vi)      Copies of the original UCC-1 financing statement, and any
     continuation statements, filed by the originator of such Cooperative Loan
     as secured party, each with evidence of recording thereof, evidencing the
     interest of the originator under the Security Agreement and the Assignment
     of Proprietary Lease;

                                          50
<PAGE>

          (vii)     Copies of the filed UCC-3 assignments of the security
     interest referenced in clause (vi) above showing an unbroken chain of title
     from the originator to the Trustee, each with evidence of recording
     thereof, evidencing the interest of the originator under the Security
     Agreement and the Assignment of Proprietary Lease;

          (viii)    An executed assignment of the interest of the originator in
     the Security Agreement, Assignment of Proprietary Lease and the recognition
     agreement referenced in clause (iv) above, showing an unbroken chain of
     title from the originator to the Trustee;

          (ix)      An executed UCC-1 financing statement showing the Company as
     debtor and the Trustee as secured party, each in a form sufficient for
     filing, evidencing the interest of such debtors in the Cooperative Loans;
     and

          (x)       For any Cooperative Loan that has been modified or amended,
     the original instrument or instruments effecting such modification or
     amendment.

     MORTGAGE INTEREST RATE: For any Mortgage Loan, the per annum rate at which
interest accrues on such Mortgage Loan pursuant to the terms of the related
Mortgage Note.

     MORTGAGE LOAN SCHEDULE: The schedule, as amended from time to time, of
Mortgage Loans attached hereto as Exhibit D, which shall set forth as to each
Mortgage Loan the following, among other things: 

          (i)       its loan number,

          (ii)      the address of the Mortgaged Property,

          (iii)     the name of the Mortgagor,

          (iv)      the Original Value of the property subject to the Mortgage,

          (v)       the Principal Balance as of the Cut-Off Date,

          (vi)      the Mortgage Interest Rate borne by the Mortgage Note,

          (vii)     whether a Primary Insurance Policy is in effect as of the
     Cut-Off Date, 

          (viii)    the maturity of the Mortgage Note,

          (ix)      the Servicing Fee and the Master Servicing Fee, and

          (x)       its Loan Group, and with respect to the Group II Loans,
whether such loan is a Subgroup II-1 Loan or a Subgroup II-2 Loan, and with
respect to the Group III Loans, whether such loan is a Subgroup III-1 loan or a
Subgroup III-2 loan.

     MORTGAGE LOANS: With respect to each Cooperative Loan, the related Mortgage
Note, Security Agreement, Assignment of Proprietary Lease, Cooperative Stock
Certificate and Cooperative Lease, and, with respect to each Mortgage Loan other
than a Cooperative Loan, the 

                                          51
<PAGE>

Mortgages and the related Mortgage Notes, each transferred and assigned to the
Trustee pursuant to the provisions hereof as from time to time are held as part
of the REMIC I Trust Fund, the Mortgage Loans so held being identified in the
Mortgage Loan Schedule.

     MORTGAGE NOTE: The note or other evidence of indebtedness evidencing the
indebtedness of a Mortgagor under a Mortgage Loan.

     MORTGAGE POOL: All of the Mortgage Loans.

     MORTGAGOR: The obligor on a Mortgage Note.

     NONRECOVERABLE ADVANCE: With respect to any Mortgage Loan, any advance
which the Master Servicer shall determine to be a Nonrecoverable Advance
pursuant to Section 4.03 and which was, or is proposed to be, made by (i) the
Master Servicer or (ii) a Servicer pursuant to its Selling and Servicing
Contract.

     NON-U.S. PERSON: A Person that is not a U.S. Person.

     OTS: The Office of Thrift Supervision, or any successor thereto.

     OFFICER'S CERTIFICATE: A certificate signed by the Chairman of the Board,
the President, a Vice President, or the Treasurer of the Master Servicer and
delivered to the Trustee.

     OPINION OF COUNSEL: A written opinion of counsel, who shall be reasonably
acceptable to the Trustee and who may be counsel for the Company or the Master
Servicer.

     ORIGINAL VALUE: With respect to any Mortgage Loan other than a Mortgage
Loan originated for the purpose of refinancing an existing mortgage debt, the
lesser of (a) the Appraised Value (if any) of the Mortgaged Property at the time
the Mortgage Loan was originated or (b) the purchase price paid for the
Mortgaged Property by the Mortgagor. With respect to a Mortgage Loan originated
for the purpose of refinancing existing mortgage debt, the Original Value shall
be equal to the Appraised Value of the Mortgaged Property at the time the
Mortgage Loan was originated or the appraised value at the time the refinanced
mortgage debt was incurred.

     OWNERSHIP INTEREST:  With respect to any Residual Certificate, any
ownership or security interest in such Residual Certificate, including any
interest in a Residual Certificate as the Holder thereof and any other interest
therein whether direct or indirect, legal or beneficial, as owner or as pledgee.

     PASS-THROUGH ENTITY:  Any regulated investment company, real estate
investment trust, common trust fund, partnership, trust or estate, and any
organization to which Section 1381 of the Code applies.

     PASS-THROUGH RATE: For each Mortgage Loan, a rate equal to the Mortgage
Interest Rate for such Mortgage Loan less the applicable per annum percentage
rates related to each of the Servicing Fee and the Master Servicing Fee. For
each Mortgage Loan, any calculation of monthly 

                                          52
<PAGE>

interest at such rate shall be based upon annual interest at such rate (computed
on the basis of a 360-day year of twelve 30-day months) on the unpaid Principal
Balance of the related Mortgage Loan divided by twelve, and any calculation of
interest at such rate by reason of a Payoff shall be based upon annual interest
at such rate on the outstanding Principal Balance of the related Mortgage Loan
multiplied by a fraction, the numerator of which is the number of days elapsed
from the Due Date of the last scheduled payment of principal and interest to,
but not including, the date of such Payoff, and the denominator of which is (a)
for Payoffs received on a Due Date, 360, and (b) for all other Payoffs, 365.

     PAYING AGENT: Any paying agent appointed by the Trustee pursuant to Section
8.12.

     PAYOFF: Any Mortgagor payment of principal on a Mortgage Loan equal to the
entire outstanding Principal Balance of such Mortgage Loan, if received in
advance of the last scheduled Due Date for such Mortgage Loan and accompanied by
an amount of interest equal to accrued unpaid interest on the Mortgage Loan to
the date of such payment-in-full.

     PAYOFF EARNINGS: For any Distribution Date with respect to each Mortgage
Loan on which a Payoff was received by the Master Servicer during the Payoff
Period, the aggregate of the interest earned by the Master Servicer from
investment of each such Payoff from the date of receipt of such Payoff until the
Business Day immediately preceding the related Distribution Date (net of
investment losses).

     PAYOFF INTEREST: For any Distribution Date with respect to a Mortgage Loan
for which a Payoff was received on or after the first calendar day of the month
of such Distribution Date and before the 15th calendar day of such month, an
amount of interest thereon at the applicable Pass-Through Rate from the first
day of the month of distribution through the day of receipt thereof; to the
extent (together with Payoff Earnings and the aggregate Master Servicing Fee)
not required to be distributed as Compensating Interest on such Distribution
Date, Payoff Interest shall be payable to the Master Servicer as additional
servicing compensation.

     PAYOFF PERIOD: With respect to the first Distribution Date, the period from
the Cut-Off Date through May 14, 1998, inclusive; and with respect to any
Distribution Date thereafter, the period from the 15th day of the Prior Period
through the 14th day of the month of such Distribution Date, inclusive.

     PERCENTAGE INTEREST:  (a) With respect to the right of each Certificate of
a particular Class in the distributions allocated to such Class, "Percentage
Interest" shall mean the percentage undivided beneficial ownership interest
evidenced by such Certificate of such Class, which percentage shall equal:

          (i)       with respect to any Certificate (other than the Residual and
     Class X Certificates), its Certificate Principal Balance divided by the
     applicable Class Principal Balance;

                                          53
<PAGE>


          (ii)      with respect to the Class X Certificates, the portion of the
     respective Class Notional Amount evidenced by such Certificate divided by
     the respective Class Notional Amount; and

          (iii)     with respect to the Residual Certificates, the percentage
     set forth on the face of such Certificate.

     (b)  With respect to the rights of each Certificate in connection with
Sections 5.09, 7.01, 8.01(c), 8.02, 8.07, 10.01 and 10.03, "Percentage Interest"
shall mean the percentage undivided beneficial interest evidenced by such
Certificate in REMIC II, which for purposes of such rights only shall equal:

          (i)       with respect to any Certificate (other than the Class X and
     Class R-2 Certificates), the product of (x) ninety-five percent (95%) and
     (y) the percentage calculated by dividing its Certificate Principal Balance
     by the Aggregate Certificate Principal Balance of the Certificates;
     provided, however, that the percentage in (x) above shall be increased by
     one percent (1%) upon each retirement of the Class X Certificates
     referenced in the parenthetical above;

          (ii)      with respect to any of the Class X Certificates, one percent
     (1%) of such Certificate's Percentage Interest as calculated by paragraph
     (a)(ii) of this definition; and

          (iii)     with respect to the Class R-2 Certificates, zero.

     PERMITTED TRANSFEREE: With respect to the holding or ownership of any
Residual Certificate, any Person other than (i) the United States, a State or
any 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 Code Section 521) which is
exempt from the taxes imposed by Chapter 1 of the Code (unless such organization
is subject to the tax imposed by Section 511 of the Code on unrelated business
taxable income), (iv) rural electric and telephone cooperatives described in
Code Section 1381(a)(2)(C), (v) any "electing large partnership" as defined in
Section 775(a) of the Code, (vi) any Person from whom the Trustee has not
received an affidavit to the effect that it is not a "disqualified organization"
within the meaning of Section 860E(e)(5) of the Code, and (vii) any other Person
so designated by the Company based upon an Opinion of Counsel that the transfer
of an Ownership Interest in a Residual Certificate to such Person may cause
REMIC I or REMIC II, as applicable, to fail to qualify as a REMIC at any time
that the Certificates are outstanding. The terms "United States", "State" and
"International Organization" shall have the meanings set forth in Code Section
7701 or successor provisions. A corporation shall not be treated as an
instrumentality of the United States or of any State or political subdivision
thereof if all of its activities are subject to tax, and, with the exception of
the FHLMC, a majority of its board of directors is not selected by such
governmental unit.

                                          54
<PAGE>

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

     PLANNED PRINCIPAL BALANCE: The amount set forth in the table attached as
Appendix A to the Prospectus, for the applicable Distribution Date, for
Component III-A-8-1 and Component III-A-8-2.

     PREPAID MONTHLY PAYMENT: Any Monthly Payment received prior to its
scheduled Due Date, which is intended to be applied to a Mortgage Loan on its
scheduled Due Date and held in the related Custodial Account for P&I until the
Withdrawal Date following its scheduled Due Date.

     PRIMARY INSURANCE POLICY: A policy of mortgage guaranty insurance, if any,
on an individual Mortgage Loan, providing coverage as required by Section
2.03(xi).

     PRINCIPAL BALANCE: Except as used in Sections 2.02 and 9.01 and for 
purposes of the definition of Purchase Price, at the time of any 
determination, the principal balance of a Mortgage Loan remaining to be paid 
at the close of business on the Cut-Off Date, after application of all 
scheduled principal payments due on or before the Cut-Off Date, whether or 
not received, reduced by all amounts distributed or (except when such 
determination occurs earlier in the month than the Distribution Date) to be 
distributed to Certificateholders through the Distribution Date in the month 
of determination that are reported as allocable to principal of such Mortgage 
Loan. 

     For purposes of the definition of Purchase Price and as used in Sections
2.02 and 9.01, at the time of any determination, the principal balance of a
Mortgage Loan remaining to be paid at the close of business on the Cut-Off Date,
after deduction of all scheduled principal payments due on or before the Cut-Off
Date, whether or not received, reduced by all amounts distributed or to be
distributed to Certificateholders through the Distribution Date in the month of
determination that are reported as allocable to principal of such Mortgage 
Loan.

     In the case of a Substitute Mortgage Loan, "Principal Balance" shall mean,
at the time of any determination, the principal balance of such Substitute
Mortgage Loan transferred to the REMIC I Trust Fund, on the date of
substitution, reduced by all amounts distributed or to be distributed to
Certificateholders through the Distribution Date in the month of determination
that are reported as allocable to principal of such Substitute Mortgage Loan.

     The Principal Balance of a Mortgage Loan (including a Substitute Mortgage
Loan) shall not be adjusted solely by reason of any bankruptcy or similar
proceeding or any moratorium or similar waiver or grace period. Whenever a
Realized Loss has been incurred with respect to a Mortgage Loan during a
calendar month, the Principal Balance of such Mortgage Loan shall be reduced by
the amount of such Realized Loss as of the Distribution Date next following the
end of such calendar month after giving effect to the allocation of Realized
Losses and distributions of principal to the Certificates.

                                          55
<PAGE>


     PRINCIPAL PAYMENT: Any payment of principal on a Mortgage Loan other than a
Principal Prepayment.

     PRINCIPAL PAYMENT AMOUNT: On any Distribution Date and for any Loan Group,
the sum with respect to the Mortgage Loans in such Loan Group of (i) the
scheduled principal payments on the Mortgage Loans due on the related Due Date,
(ii) the principal portion of repurchase proceeds received with respect to any
Mortgage Loan which was repurchased by the Company pursuant to a Purchase
Obligation or as permitted by this Agreement during the Prior Period, and (iii)
any other unscheduled payments of principal which were received with respect to
any Mortgage Loan during the Prior Period, other than Payoffs, Curtailments and
Liquidation Principal.

     PRINCIPAL PREPAYMENT: Any payment of principal on a Mortgage Loan which
constitutes a Payoff or a Curtailment.

     PRINCIPAL PREPAYMENT AMOUNT: On any Distribution Date and for any Loan
Group, the sum with respect to the Mortgage Loans in such Loan Group of (i)
Curtailments received during the Prior Period from such Mortgage Loans and (ii)
Payoffs received during the Payoff Period from such Mortgage Loans.

     PRIOR PERIOD: The calendar month immediately preceding any Distribution
Date.

     PRO RATA ALLOCATION: (i) With respect to losses on Group III Loans, the
allocation of the principal portion of Realized Losses to the outstanding Group
III Certificates (other than the Class III-P Certificates), pro rata according
to their respective Class or Component Principal Balances, in reduction of their
respective Class or Component Principal Balances (except if the loss is
recognized with respect to a Class III-P Mortgage Loan, in which case the Class
III-P Fraction of such loss will first be allocated to the Class III-P
Certificates, and the remainder of such loss will be allocated as set forth
above), and the allocation of the interest portion of Realized Losses to the
outstanding Group III Certificates, pro rata according to the amount of interest
accrued but unpaid on each such Class or Component in reduction thereof, and
then in reduction of their related Class or Component Principal Balances (other
than the Class III-P and Class III-A-10 Certificates) and (ii) with respect to
losses on Group I Loans, Group II Loans or Group IV Loans, the allocation of the
principal portion of Realized Losses to all Classes of the Group I, Group II,
Group IV and Group C-B Certificates (other than the Class I-P, Class II-P and
Class IV-P Certificates) pro rata according to their respective Class Principal
Balances (except if the loss is recognized with respect to a Class I-P, Class
II-P or Class IV-P Mortgage Loan, in which case the applicable Class P Fraction
of such loss will first be allocated to the related Class P Certificates, and
the remainder of such loss will be allocated as set forth above), and the
allocation of the interest portion of Realized Losses to all Classes of the
Group I, Group II, Group IV and Group C-B Certificates pro rata according to the
amount of interest accrued but unpaid on each such Class, in reduction thereof
and then in reduction of their related Class Principal Balances (other than the
Class I-P, Class II-P and Class IV-P Certificates). 

     PROSPECTUS:  The Prospectus, dated November 24, 1997, and the Prospectus
Supplement, dated April 27, 1998, of the Company.

                                          56
<PAGE>

     PURCHASE OBLIGATION: An obligation of the Company to repurchase Mortgage
Loans under the circumstances and in the manner provided in Section 2.02 or
Section 2.03.

     PURCHASE PRICE: With respect to any Mortgage Loan to be purchased pursuant
to a Purchase Obligation, an amount equal to the sum of the Principal Balance
thereof, and unpaid accrued interest thereon, if any, to the last day of the
calendar month in which the date of repurchase occurs at a rate equal to the
applicable Pass-Through Rate; provided, however, that no Mortgage Loan shall be
purchased or required to be purchased pursuant to Section 2.03, or more than two
years after the Closing Date under Section 2.02, unless (a) the Mortgage Loan to
be purchased is in default, or default is reasonably imminent in the judgment of
the Company, or (b) the Company, at its expense, delivers to the Trustee an
Opinion of Counsel to the effect that the purchase of such Mortgage Loan will
not give rise to a tax on a prohibited transaction, as defined in Section
860F(a) of the Code; provided, further, that in the case of clause (b) above,
the Company will use its reasonable efforts to obtain such Opinion of Counsel if
such opinion is obtainable.

     QUALIFIED INSURER: A mortgage guaranty insurance company duly qualified as
such under the laws of the states in which the Mortgaged Properties are located
if such qualification is necessary to issue the applicable insurance policy or
bond, duly authorized and licensed in such states to transact the applicable
insurance business and to write the insurance provided by the Primary Insurance
Policies and approved as an insurer by FHLMC or FNMA and the Master Servicer. A
Qualified Insurer must have the rating required by the Rating Agencies. 

     RATING AGENCY: Initially, each of S&P and Fitch, thereafter, each
nationally recognized statistical rating organization that has rated the
Certificates at the request of the Company, or their respective successors in
interest.

     RATINGS: As of any date of determination, the ratings, if any, of the
Certificates as assigned by the Rating Agencies.

     REALIZED LOSS: For any Distribution Date, with respect to any Mortgage Loan
which became a Liquidated Mortgage Loan during the related Prior Period, the sum
of (i) the principal balance of such Mortgage Loan remaining outstanding and the
principal portion of Nonrecoverable Advances actually reimbursed with respect to
such Mortgage Loan (the principal portion of such Realized Loss), and (ii) the
accrued interest on such Mortgage Loan remaining unpaid and the interest portion
of Nonrecoverable Advances actually reimbursed with respect to such Mortgage
Loan (the interest portion of such Realized Loss). For any Distribution Date,
with respect to any Mortgage Loan which is not a Liquidated Mortgage Loan, the
amount of the Bankruptcy Loss incurred with respect to such Mortgage Loan as of
the related Due Date.

     For any Distribution Date, Realized Losses on the Mortgage Loans in Loan
Group I, Loan Group II and Loan Group IV for the Prior Period shall be allocated
as follows:  The interest portion of Realized Losses, if any, shall be allocated
among the classes of REMIC I Regular Interests and the Class R-1 Certificates
related to such Loan Group or Subgroup pro-rata according to accrued but unpaid
interest thereon and in reduction thereof.  Any of the interest portion of
Realized Losses in excess of the amount allocated pursuant to the preceding
sentence 

                                          57
<PAGE>

shall be treated as Realized Losses with respect to principal not attributable
to any specific Mortgage Loan in such Loan Group or Subgroup and allocated
pursuant to the succeeding sentences.  The applicable Class P Fraction of any
Realized Loss with respect to principal attributable to a Class P Mortgage Loan
in the Loan Group or Subgroup shall be allocated to the related Class P-L
Regular Interests in reduction of the principal balance thereof.  The remainder
of the principal portion of Realized Losses shall be allocated, first, to the
Class Y-L Regular Interests related to the Loan Group or Subgroup to the extent
of the applicable Class Y-L Principal Reduction Amount in reduction of the
principal balance of such REMIC I Regular Interests and, second, the remainder,
if any, of such Principal Realized Losses shall be allocated to the related
Class Z-L Regular Interests in reduction of the principal balance thereof.  

For any Distribution Date, Realized Losses on the Mortgage Loans in Loan 
Group III for the Prior Period shall be allocated as follows: the interest 
portion of Realized Losses with respect to the Group III Loans shall be 
allocated to the Class W-L and Group III-X-L Regular Interests pro rata in 
reduction of accrued but unpaid interest thereon and in reduction thereof. 
Any of the interest portion of Realized Losses in excess of the amount 
allocated pursuant to the preceding sentence shall be treated as Realized 
Losses with respect to principal not attributable to any specific Group III 
Loan and shall be allocated pursuant to the succeeding sentences. The 
applicable Class P Fraction of any Realized Loss with respect to principal 
attributable to a Class III-P Mortgage Loan shall be allocated to the Class 
III-P-L Regular Interests in reduction of the principal balance thereof.  The 
remainder of the principal portion of Realized Losses shall be allocated to 
the Class W-L Regular Interests in reduction of the principal balance 
thereof.  

     Except for Special Hazard Losses in excess of the Combined Special 
Hazard Coverage, Fraud Losses in excess of the Combined Fraud Coverage and 
Bankruptcy Losses in excess of the Combined Bankruptcy Coverage, Realized 
Losses with respect to the Group I Loans, the Group II Loans and the Group IV 
Loans shall be allocated among the Group I, Group II, Group IV and Group C-B 
Certificates (i) for Realized Losses allocable to principal (a) first, to the 
Class C-B-6 Certificates, until the Class C-B-6 Principal Balance has been 
reduced to zero, (b) second, to the Class C-B-5 Certificates, until the Class 
C-B-5 Principal Balance has been reduced to zero, (c) third, to the Class 
C-B-4 Certificates, until the Class C-B-4 Principal Balance has been reduced 
to zero, (d) fourth, to the Class C-B-3 Certificates, until the Class C-B-3 
Principal Balance has been reduced to zero, (e) fifth, to the Class C-B-2 
Certificates, until the Class C-B-2 Principal Balance has been reduced to 
zero, (f) sixth, to the Class C-B-1 Certificates, until the Class C-B-1 
Principal Balance has been reduced to zero and (g) seventh, to (I) the Class 
I-A-1 Certificates, (II) the Class II-A-1 Certificates or (III) the Group 
IV-A and Class R-2 Certificates (in accordance with the proviso at the end of 
this paragraph), pro rata according to their Class Principal Balances in 
reduction thereof; provided, however, that if the loss is recognized with 
respect to a Class P Mortgage Loan, the Class P Fraction of such loss will 
first be allocated to the related Class P Certificates, and the remainder of 
such loss will be allocated as described above in this clause (i); and (ii) 
for Realized Losses allocable to interest (a) first, to the Class C-B-6 
Certificates, in reduction of accrued but unpaid interest thereon and then in 
reduction of the Class C-B-6 Principal Balance, (b) second, to the Class 
C-B-5 Certificates, in reduction of accrued but unpaid interest thereon and 
then in reduction of the Class C-B-5 Principal Balance, (c) third, to the 
Class C-B-4 Certificates, in reduction of accrued but unpaid interest thereon 
and then in reduction of 

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<PAGE>

the Class C-B-4 Principal Balance, (d) fourth, to the Class C-B-3 Certificates,
in reduction of accrued but unpaid interest thereon and then in reduction of the
Class C-B-3 Principal Balance, (e) fifth, to the Class C-B-2 Certificates, in
reduction of accrued but unpaid interest thereon and then in reduction of the
Class C-B-2 Principal Balance, (f) sixth, to the Class C-B-1 Certificates, in
reduction of accrued but unpaid interest thereon and then in reduction of the
Class C-B-1 Principal Balance, and (g) seventh, to (I) the Class I-A-1 and Class
I-X Certificates, (II) the Class II-A-1 and Class II-X Certificates or (III) the
Group IV-A, Class IV-X and Class R-2 Certificates (in accordance with the
proviso at the end of this paragraph), pro rata according to accrued but unpaid
interest on such Classes of Certificates and then pro rata according to their
Class Principal Balances in reduction thereof; provided, however, that in the
case of clause (i)(g) and (ii)(g) of this paragraph, losses on Group I Loans
will only be allocated to the Group I Certificates that are Senior Certificates,
losses on Group II Loans will only be allocated to the Group II Certificates
that are Senior Certificates and losses on Group IV Loans will only be allocated
to the Group IV Certificates that are Senior Certificates.

     Except for Special Hazard Losses in excess of the Group III Special 
Hazard Coverage, Fraud Losses in excess of the Group III Fraud Coverage and 
Bankruptcy Losses in excess of the Group III Bankruptcy Coverage, Realized 
Losses with respect to the Group III Loans shall be allocated among the Group 
III Certificates (i) for Realized Losses allocable to principal (a) first, to 
the Class III-B-6 Certificates, until the Class III-B-6 Principal Balance has 
been reduced to zero, (b) second, to the Class III-B-5 Certificates, until 
the Class III-B-5 Principal Balance has been reduced to zero, (c) third, to 
the Class III-B-4 Certificates, until the Class III-B-4 Principal Balance has 
been reduced to zero, (d) fourth, to the Class III-B-3 Certificates, until 
the Class III-B-3 Principal Balance has been reduced to zero, (e) fifth, to 
the Class III-B-2 Certificates, until the Class III-B-2 Principal Balance has 
been reduced to zero, (f) sixth, to the Class III-B-1 Certificates, until the 
Class III-B-1 Principal Balance has been reduced to zero, and (g) seventh, to 
the Group III-A Certificates pro rata, according to their Class Principal 
Balances (or Component Principal Balances in the case of the Class III-A-8 
and Class III-A-10 Certificates) in reduction of their respective Class or 
Component Principal Balances, as applicable; provided, however, that if the 
loss is recognized with respect to a Class III-P Mortgage Loan, the Class 
III-P Fraction of such loss will first be allocated to the Class III-P 
Certificates and the remainder of such loss will be allocated as described 
above in this clause (i); and (ii) for Realized Losses allocable to interest 
(a) first, to the Class III-B-6 Certificates, in reduction of accrued but 
unpaid interest thereon and then in reduction of the Class III-B-6 Principal 
Balance, (b) second, to the Class III-B-5 Certificates, in reduction of 
accrued but unpaid interest thereon and then in reduction of the Class 
III-B-5 Principal Balance, (c) third, to the Class III-B-4 Certificates, in 
reduction of accrued but unpaid interest thereon and then in reduction of the 
Class III-B-4 Principal Balance, (d) fourth, to the Class III-B-3 
Certificates, in reduction of accrued but unpaid interest thereon and then in 
reduction of the Class III-B-3 Principal Balance, (e) fifth, to the Class 
III-B-2 Certificates, in reduction of accrued but unpaid interest thereon and 
then in reduction of the Class III-B-2 Principal Balance, (f) sixth, to the 
Class III-B-1 Certificates, in reduction of accrued but unpaid interest 
thereon and then in reduction of the Class III-B-1 Principal Balance, and (g) 
seventh, to the Group III-A Certificates (other than the Class III-A-10 
Certificates) and the Group III-X Certificates pro rata according to accrued 
but unpaid interest on such Classes (or Components in the case of the Class 
III-A-8 Certificates) and then pro rata according to their 

                                          59
<PAGE>

Class or Component Principal Balances in reduction of their respective Class or
Component Principal Balances, as applicable.

     Special Hazard Losses on Group III Loans in excess of the Group III Special
Hazard Coverage, Fraud Losses on Group III Loans in excess of the Group III
Fraud Coverage, and Bankruptcy Losses on Group III Loans in excess of the Group
III Bankruptcy Coverage shall be allocated among the Group III Certificates by
Pro Rata Allocation.

     Special Hazard Losses on Group I Loans, Group II Loans and Group IV Loans
in excess of the Combined Special Hazard Coverage, Fraud Losses on Group I
Loans, Group II Loans and Group IV Loans in excess of the Combined Fraud
Coverage, and Bankruptcy Losses on Group I Loans, Group II Loans and Group IV
Loans in excess of the Combined Bankruptcy Coverage shall be allocated among
the Group I, Group II, Group IV and Group C-B Certificates by Pro Rata
Allocation.

     On each Distribution Date, if the aggregate Class Principal Balance of all
outstanding Group I, Group II, Group IV and Group C-B Certificates exceeds the
aggregate Principal Balance of the Group I Loans, the Group II Loans and the
Group IV Loans after giving effect to distributions of principal and the
allocation of all Realized Losses to the Group I, Group II, Group IV and Group
C-B Certificates as provided in this Agreement on such Distribution Date
(without regard to this paragraph), then such excess will be deemed a principal
loss and will be allocated to the most junior Class of Group C-B Certificates,
in reduction of the Class Principal Balance thereof.

     On each Distribution Date, if the aggregate Class Principal Balance of all
outstanding Group III Certificates exceeds the aggregate Principal Balance of
the Group III Loans after giving effect to distributions of principal and the
allocation of all Realized Losses to the Group III Certificates as provided in
this Agreement on such Distribution Date (without regard to this paragraph),
then such excess will be deemed a principal loss and will be allocated to the
most junior Class of Group III-B Certificates, in reduction of the Class
Principal Balance thereof.

     RECORD DATE: The last Business Day of the month immediately preceding the
month of the related Distribution Date.

     REGULAR INTERESTS: With respect to REMIC I, the REMIC I Regular Interests
and with respect to REMIC II, the Certificates (other than the Residual
Certificates).

     REMIC: A real estate mortgage investment conduit, as such term is defined
in the Code.

     REMIC PROVISIONS: Sections 860A through 860G of the Code, related Code
provisions and regulations promulgated thereunder, as the foregoing may be in
effect from time to time.

     REMIC I: The segregated pool of assets consisting of the REMIC I Trust Fund
conveyed in trust to the Trustee for the benefit of the Holders of the REMIC I
Regular Interests and the Class R-1 Certificates pursuant to Section 2.01, with
respect to which a separate REMIC election is to be made.

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<PAGE>

     REMIC I AVAILABLE DISTRIBUTION AMOUNT:  With respect to each Loan Group on
any Distribution Date, the sum of the following amounts with respect to the
Mortgage Loans in such Loan Group:

          (1)  the total amount of all cash received by or on behalf of the
     Master Servicer with respect to such Mortgage Loans by the Determination
     Date for such Distribution Date and not previously distributed (including
     Monthly P&I Advances made by Servicers, proceeds of Mortgage Loans in such
     Loan Group which have been liquidated and scheduled amounts of
     distributions from Buydown Funds respecting Buydown Loans, if any), except:

               (a)  all scheduled payments of principal and interest collected
          but due on a date subsequent to the related Due Date;

               (b)  all Curtailments received after the Prior Period (together
          with any interest payment received with such prepayments to the extent
          that it represents the payment of interest accrued on a related
          Mortgage Loan subsequent to the Prior Period);

               (c)  all Payoffs received after the Payoff Period immediately
          preceding such Distribution Date (together with any interest payment
          received with such Payoffs to the extent that it represents the
          payment of interest accrued on the Mortgage Loans for the period
          subsequent to the Prior Period), and interest which was accrued and
          received on Payoffs received during the period from the 1st to the
          14th day of the month of such Determination Date, which interest shall
          not be included in the calculation of the REMIC I Available
          Distribution Amount for any Distribution Date;

               (d)   Insurance Proceeds and Liquidation Proceeds received on
          such Mortgage Loans after the Prior Period;

               (e)  all amounts in the Certificate Account which are due and
          reimbursable to a Servicer or the Master Servicer pursuant to the
          terms of this Agreement;

               (f)  the sum of the Master Servicing Fee and the Servicing Fee
          for each such Mortgage Loan; and

               (g)  Excess Liquidation Proceeds;

          (2)  the sum, to the extent not previously distributed, of the
     following amounts, to the extent advanced or received, as applicable, by
     the Master Servicer:

               (a)  any Monthly P&I Advance made by the Master Servicer to the
          Trustee with respect to such Distribution Date relating to such
          Mortgage Loans; and

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<PAGE>

               (b)  Compensating Interest; and

     (3)  the total amount, to the extent not previously distributed, of all
cash received by the Distribution Date by the Trustee or the Master Servicer, in
respect of a Purchase Obligation under Section 2.02 and Section 2.03 or any
permitted repurchase of a Mortgage Loan.

     REMIC I DISTRIBUTION AMOUNT: For any Distribution Date, the REMIC I
Available Distribution Amount shall be distributed to the REMIC I Regular
Interests and the Class R-1 Certificates in the following amounts and priority:

     (a)  To the extent of the REMIC I Available Distribution Amount for Loan
Group I:

          (i)       first, to the Class I-P-L Regular Interests, the aggregate
     for all of the Class I-P Mortgage Loans of the product for each Class I-P
     Mortgage Loan of the applicable Class I-P Fraction and the sum of (x)
     scheduled payments of principal on such Class I-P Mortgage Loan due on or
     before the related Due Date in respect of which no distribution has been
     made on any previous Distribution Date and which were received by the
     Determination Date, or which have been advanced as part of a Monthly P&I
     Advance with respect to such Distribution Date, (y) the principal portion
     received in respect of such Class I-P Mortgage Loan during the Prior Period
     of (1) Curtailments, (2) Insurance Proceeds, (3) the amount, if any, of the
     principal portion of the Purchase Price paid pursuant to a Purchase
     Obligation or any repurchase of a Mortgage Loan permitted hereunder and (4)
     Liquidation Proceeds and (z) the principal portion of Payoffs received in
     respect of such Class I-P Mortgage Loan during the Payoff Period;

          (ii)      second, to the Class Y-1-L, Class Z-1-L and Class I-X-L
     Regular Interests, concurrently, the sum of the Interest Distribution
     Amounts for such Classes of Regular Interests remaining unpaid from
     previous Distribution Dates, pro rata according to their respective shares
     of such unpaid amounts;

          (iii)     third, to the Class Y-1-L, Class Z-1-L and Class I-X-L
     Regular Interests, concurrently, the sum of the Interest Distribution
     Amounts for such Classes of Regular Interests for the current Distribution
     Date, pro rata according to their respective Interest Distribution Amounts;

          (iv)      fourth, to the Class Y-1-L and Class Z-1-L Regular
     Interests, the Class Y-1-L and Class Z-1-L Principal Distribution Amount,
     respectively; and

          (v)       fifth, to the Class R-1 Certificates, the Residual
     Distribution Amount for Loan Group I for such Distribution Date.

     (b)  To the extent of the REMIC I Available Distribution Amount for Loan
Group II:

          (i)       first, to the Class II-P-L Regular Interests, the aggregate
     for all of the Class II-P Mortgage Loans of the product for each 
     Class II-P Mortgage Loan of the applicable Class II-P Fraction and the 
     sum of (x) scheduled payments of principal on such Class II-P Mortgage 
     Loan due on or before the related Due Date in respect of which no 
     distribution 

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<PAGE>

     has been made on any previous Distribution Date and which were received by
     the Determination Date, or which have been advanced as part of a Monthly
     P&I Advance with respect to such Distribution Date, (y) the principal
     portion received in respect of such Class II-P Mortgage Loan during the
     Prior Period of (1) Curtailments, (2) Insurance Proceeds, (3) the amount,
     if any, of the principal portion of the Purchase Price paid pursuant to a
     Purchase Obligation or any repurchase of a Mortgage Loan permitted
     hereunder and (4) Liquidation Proceeds and (z) the principal portion of
     Payoffs received in respect of such Class II-P Mortgage Loan during the
     Payoff Period;

          (ii)      second, to the Class Y-3-L, Class Y-4-L, Class Z-3-L, Class
     Z-4-L and Class II-X-L Regular Interests, concurrently, the sum of the
     Interest Distribution Amounts for such Classes of Regular Interests
     remaining unpaid from previous Distribution Dates, pro rata according to
     their respective shares of such unpaid amounts; provided that, (A) only
     amounts distributed with respect to Subgroup II-1 will be paid to the Class
     Y-3-L and Class Z-3-L Regular Interests and (B) only amounts distributed
     with respect to Subgroup II-2 will be paid to the Class Y-4-L and 
     Class Z-4-L Regular Interests, in each case pursuant to this clause (ii);

          (iii)     third, to the Class Y-3-L, Class Y-4-L, Class Z-3-L, Class
     Z-4-L and Class II-X-L Regular Interests, concurrently, the sum of the
     Interest Distribution Amounts for such Classes of Regular Interests for the
     current Distribution Date, pro rata according to their respective Interest
     Distribution Amounts; provided that, (A) only amounts distributed with
     respect to Subgroup II-1 will be paid to the Class Y-3-L and Class Z-3-L
     Regular Interests and (B) only amounts distributed with respect to Subgroup
     II-2 will be paid to the Class Y-4-L and Class Z-4-L Regular Interests, in
     each case pursuant to this clause (iii); 

          (iv)      fourth, to the Class Y-3-L, Class Y-4-L, Class Z-3-L and
     Class Z-4-L Regular Interests, the Class Y-3-L,  Class Y-4-L, Class Z-3-L
     and Class Z-4-L Principal Distribution Amounts, respectively; provided
     that, (A) only amounts distributed with respect to Subgroup II-1 will be
     paid to the Class Y-3-L and Class Z-3-L Regular Interests and (B) only
     amounts distributed with respect to Subgroup II-2 will be paid to the Class
     Y-4-L and Class Z-4-L Regular Interests, in each case pursuant to this
     clause (iv); and

          (v)       fifth, to the Class R-1 Certificates, the Residual
     Distribution Amount for Loan Group II for such Distribution Date.

     (c)  To the extent of the REMIC I Available Distribution Amount for Loan
Group III:

          (i)       first, to the Class III-P-L Regular Interests, the aggregate
     for all of the Class III-P Mortgage Loans of the product for each Class
     III-P Mortgage Loan of the applicable Class III-P Fraction and the sum of
     (x) scheduled payments of principal on such Class III-P Mortgage Loan due
     on or before the related Due Date in respect of which no distribution has
     been made on any previous Distribution Date and which were received by the
     Determination Date, or which have been advanced as part of a Monthly P&I
     Advance 

                                          63
<PAGE>

     with respect to such Distribution Date, (y) the principal portion received
     in respect of such Class III-P Mortgage Loan during the Prior Period of (1)
     Curtailments, (2) Insurance Proceeds, (3) the amount, if any, of the
     principal portion of the Purchase Price paid pursuant to a Purchase
     Obligation or any repurchase of a Mortgage Loan permitted hereunder and (4)
     Liquidation Proceeds and (z) the principal portion of Payoffs received in
     respect of such Class III-P Mortgage Loan during the Payoff Period;

          (ii)      second, to the Class W-L and Class III-X-L Regular
     Interests, concurrently, the Interest Distribution Amounts for such Classes
     of Regular Interests remaining unpaid from previous Distribution Dates;

          (iii)     third, to the Class W-L and Class III-X-L Regular Interests,
     concurrently, the Interest Distribution Amounts for such Classes of Regular
     Interests for the current Distribution Date; 

          (iv)      fourth, to the Class W-L Regular Interests, until the Class
     W-L Principal Balance has been reduced to zero; and

          (v)       fifth, to the Class R-1 Certificates, the Residual
     Distribution Amount for Loan Group III for such Distribution Date.

     (d)  To the extent of the REMIC I Available Distribution Amount for Loan
Group IV:

          (i)     first, to the Class IV-P-L Regular Interests, the aggregate
     for all of the Class IV-P Mortgage Loans of the product for each Class IV-P
     Mortgage Loan of the applicable Class IV-P Fraction and the sum of (x)
     scheduled payments of principal on such Class IV-P Mortgage Loan due on or
     before the related Due Date in respect of which no distribution has been
     made on any previous Distribution Date and which were received by the
     Determination Date, or which have been advanced as part of a Monthly P&I
     Advance with respect to such Distribution Date, (y) the principal portion
     received in respect of such Class IV-P Mortgage Loan during the Prior
     Period of (1) Curtailments, (2) Insurance Proceeds, (3) the amount, if any,
     of the principal portion of the Purchase Price paid pursuant to a Purchase
     Obligation or any repurchase of a Mortgage Loan permitted hereunder and (4)
     Liquidation Proceeds and (z) the principal portion of Payoffs received in
     respect of such Class IV-P Mortgage Loan during the Payoff Period;

          (ii)    second, to the Class Y-2-L, Class Z-2-L and Class IV-X-L
     Regular Interests and the Class R-1 Certificates, concurrently, the sum of
     the Interest Distribution Amounts for such Classes of Regular Interests and
     Certificates remaining unpaid from previous Distribution Dates, pro rata
     according to their respective shares of such unpaid amounts;

          (iii)   third, to the Class Y-2-L, Class Z-2-L and Class IV-X-L
     Regular Interests and the Class R-1 Certificates, concurrently, the sum of
     the Interest Distribution Amounts for such Classes of Regular Interests and
     Certificates for the current Distribution Date, pro rata according to their
     respective Interest Distribution Amounts;

                                          64
<PAGE>

          (iv)    fourth, to the Class R-1 Certificates, until the Class R-1
     Principal Balance has been reduced to zero;

          (v)     fifth, to the Class Y-2-L and Class Z-2-L Regular Interests,
     the Class Y-2-L and Class Z-2-L Principal Distribution Amounts,
     respectively; and

          (vi)    sixth, to the Class R-1 Certificates, the Residual
     Distribution Amount for Loan Group IV for such Distribution Date.

     REMIC I REGULAR INTEREST: The Class Y-1-L, Class Y-2-L, Class Y-3-L, Class
Y-4-L, Class Z-1-L, Class Z-2-L, Class Z-3-L, Class Z-4-L, Class W-L, Class X-L
and Class P-L Regular Interests.

     REMIC I TRUST FUND: The corpus of the trust created pursuant to Section 
2.01 of this Agreement. The REMIC I Trust Fund consists of (i) the Mortgage 
Loans and all rights pertaining thereto; (ii) such assets as from time to 
time may be held by the Trustee (or its duly appointed agent) in the 
Certificate Account or the Investment Account (except amounts representing 
the Master Servicing Fee or the Servicing Fee); (iii) such assets as from 
time to time may be held by Servicers in a Custodial Account for P&I or 
Custodial Account for Reserves related to the Mortgage Loans (except amounts 
representing the Master Servicing Fee or the Servicing Fee); (iv) property 
which secured a Mortgage Loan and which has been acquired by foreclosure or 
deed in lieu of foreclosure or, in the case of a Cooperative Loan, a similar 
form of conversion, after the Cut-Off Date; and (v) amounts paid or payable 
by the insurer under any FHA insurance policy or any Primary Insurance Policy 
and proceeds of any VA guaranty and any other insurance policy related to any 
Mortgage Loan or the Mortgage Pool.

     REMIC II: The segregated pool of assets consisting of the REMIC I Regular
Interests conveyed in trust to the Trustee for the benefit of the
Certificateholders (other than the Class R-1 Certificateholders) pursuant to
Section 2.05, with respect to which a separate REMIC election is to be made.

     REMIC II AVAILABLE DISTRIBUTION AMOUNT: With respect to the Group I 
Certificates, on any Distribution Date, the aggregate of all distributions 
with respect to the Class Y-1-L, Class Z-1-L, Class I-X-L and Class I-P-L 
Regular Interests. With respect to the Group II Certificates, on any 
Distribution Date, the aggregate of all distributions with respect to the 
Class Y-3-L, Class Z-3-L, Class Y-4-L, Class Z-4-L, Class II-X-L and Class 
II-P-L Regular Interests. With respect to the Group III Certificates, on any 
Distribution Date, the aggregate of all distributions with respect to the 
Class W-L, Class III-X-L and Class III-P-L Regular Interests. With respect to 
the Group IV Certificates, on any Distribution Date, the aggregate of all 
distributions with respect to the Class Y-2-L, Class Z-2-L, Class IV-X-L and 
Class IV-P-L Regular Interests. 

     REMIC II DISTRIBUTION AMOUNT: (I) For any Distribution Date prior to the
Combined Credit Support Depletion Date or Group III Credit Support Depletion
Date, as applicable, the REMIC II Available Distribution Amount for each
Certificate Group shall be distributed to the Certificates of the related
Certificate Group (other than the Class R-1 Certificates) in the following
amounts and priority:

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<PAGE>

     (a)   With respect to the Group I Certificates, on any Distribution Date
prior to the Combined Credit Support Depletion Date, to the extent of the REMIC
II Available Distribution Amount for the Group I Certificates remaining
following prior distributions, if any, on such Distribution Date:

          (i)       first, to the Class I-P Certificates, the aggregate for all
     Class I-P Mortgage Loans of the product for each Class I-P Mortgage Loan of
     the applicable Class I-P Fraction and the sum of (x) scheduled payments of
     principal on such Class I-P Mortgage Loan due on or before the related Due
     Date in respect of which no distribution has been made on any previous
     Distribution Date and which were received by the Determination Date, or
     which have been advanced as part of a Monthly P&I Advance with respect to
     such Distribution Date, (y) the principal portion received in respect of
     such Class I-P Mortgage Loan during the Prior Period of (1) Curtailments,
     (2) Insurance Proceeds, (3) the amount, if any, of the principal portion of
     the Purchase Price paid pursuant to a Purchase Obligation or any repurchase
     of a Mortgage Loan permitted hereunder and (4) Liquidation Proceeds and (z)
     the principal portion of Payoffs received in respect of such Class I-P
     Mortgage Loan during the Payoff Period;

          (ii)      second, to the Class I-A-1 and Class I-X Certificates,
     concurrently, the sum of the Interest Distribution Amounts for such Classes
     of Certificates remaining unpaid from previous Distribution Dates, pro rata
     according to their respective shares of such unpaid amounts;

          (iii)     third, to the Class I-A-1 and Class I-X Certificates,
     concurrently, the sum of the Interest Distribution Amounts for such Classes
     of Certificates for the current Distribution Date, pro rata according to
     their respective Interest Distribution Amounts; and

          (iv)      fourth, to the Class I-A-1 Certificates, as principal, the
     Group I Senior Principal Distribution Amount.

     (b)   With respect to the Group II Certificates, on any Distribution Date
prior to the Combined Credit Support Depletion Date, to the extent of the REMIC
II Available Distribution Amount for the Group II Certificates remaining
following prior distributions, if any, on such Distribution Date:

          (i)       first, to the Class II-P Certificates, the aggregate for all
     Class II-P Mortgage Loans of the product for each Class II-P Mortgage Loan
     of the applicable Class II-P Fraction and the sum of (x) scheduled payments
     of principal on such Class II-P Mortgage Loan due on or before the related
     Due Date in respect of which no distribution has been made on any previous
     Distribution Date and which were received by the Determination Date, or
     which have been advanced as part of a Monthly P&I Advance with respect to
     such Distribution Date, (y) the principal portion received in respect of
     such Class II-P Mortgage Loan during the Prior Period of (1) Curtailments,
     (2) Insurance Proceeds, (3) the amount, if any, of the principal portion of
     the Purchase Price paid pursuant to a Purchase Obligation or any repurchase
     of a Mortgage Loan permitted 

                                          66
<PAGE>

     hereunder and (4) Liquidation Proceeds and (z) the principal portion of
     Payoffs received in respect of such Class II-P Mortgage Loan during the
     Payoff Period;

          (ii)      second, to the Class II-A-1 and Class II-X Certificates,
     concurrently, the sum of the Interest Distribution Amounts for such Classes
     of Certificates remaining unpaid from previous Distribution Dates, pro rata
     according to their respective shares of such unpaid amounts; 

          (iii)     third, to the Class II-A-1 and Class II-X Certificates,
     concurrently, the sum of the Interest Distribution Amounts for such Classes
     of Certificates for the current Distribution Date, pro rata according to
     their respective Interest Distribution Amounts; and

          (iv)      fourth, to the Class II-A-1 Certificates, as principal, the
     Group II Senior Principal Distribution Amount. 

     (c)   With respect to the Group IV Certificates, on any Distribution Date
prior to the Combined Credit Support Depletion Date, to the extent of the REMIC
II Available Distribution Amount for the Group IV Certificates remaining
following prior distributions, if any, on such Distribution Date:

          (i)       first, to the Class IV-P Certificates, the aggregate for all
     Class IV-P Mortgage Loans of the product for each Class IV-P Mortgage Loan
     of the applicable Class IV-P Fraction and the sum of (x) scheduled payments
     of principal on such Class IV-P Mortgage Loan due on or before the related
     Due Date in respect of which no distribution has been made on any previous
     Distribution Date and which were received by the Determination Date, or
     which have been advanced as part of a Monthly P&I Advance with respect to
     such Distribution Date, (y) the principal portion received in respect of
     such Class IV-P Mortgage Loan during the Prior Period of (1) Curtailments,
     (2) Insurance Proceeds, (3) the amount, if any, of the principal portion of
     the Purchase Price paid pursuant to a Purchase Obligation or any repurchase
     of a Mortgage Loan permitted hereunder and (4) Liquidation Proceeds and (z)
     the principal portion of Payoffs received in respect of such Class IV-P
     Mortgage Loan during the Payoff Period;

          (ii)      second, to the Group IV-A, Class R-2 and Class IV-X
     Certificates, concurrently, the sum of the Interest Distribution Amounts
     for such Classes of Certificates remaining unpaid from previous
     Distribution Dates, pro rata according to their respective shares of such
     unpaid amounts; 

          (iii)     third, to the Group IV-A, Class R-2 and Class IV-X
     Certificates, concurrently, the sum of the Interest Distribution Amounts
     for such Classes of Certificates for the current Distribution Date, pro
     rata according to their respective Interest Distribution Amounts; and

          (iv)      fourth, to the Group IV-A and Class R-2 Certificates, as
     principal, the Group IV Senior Principal Distribution Amount, as follows:

                                          67
<PAGE>

               (a)  first, to the Class R-2 Certificates, until the Class R-2
          Principal Balance has been reduced to zero; and

               (b)  second, to the Group IV-A Certificates, pro rata, the
          portion of the Group IV Senior Principal Distribution Amount remaining
          after the distribution set forth above, until the aggregate Class
          Principal Balance of the Group IV-A Certificates has been reduced to
          zero.

     (d)  With respect to the Group C-B, Class I-P, Class II-P, Class IV-P and
Class R-2  Certificates, on any Distribution Date prior to the Combined Credit
Support Depletion Date, subject to the payment of the amounts set forth in
paragraphs (I)(a), (I)(b) and (I)(c) of this definition or REMIC II Distribution
Amount, and to the extent of the REMIC II Available Distribution Amount for the
Group I, Group II and Group IV Certificates remaining following prior
distributions, if any, on such Distribution Date:

          (i)       first, to the Class I-P, Class II-P and Class IV-P
     Certificates, to the extent of amounts otherwise available to pay the Group
     C-B Subordinate Principal Distribution Amount (without regard to clause (B)
     of the definition thereof) on such Distribution Date, the amount payable to
     the Class I-P, Class II-P and Class IV-P Certificates on previous
     Distribution Dates pursuant to clause (I)(d)(ii) of this definition of
     "REMIC II Distribution Amount" and remaining unpaid from such previous
     Distribution Dates;

          (ii)      second, to the Class I-P, Class II-P and Class IV-P
     Certificates, to the extent of amounts otherwise available to pay the Group
     C-B Subordinate Principal Distribution Amount (without regard to clause (B)
     of the definition thereof) on such Distribution Date, principal in an
     amount equal to the Class I-P, Class II-P or Class IV-P Fraction, as
     applicable, of any Realized Loss on a Class I-P Mortgage Loan, a Class II-P
     Mortgage Loan or a Class IV-P Mortgage Loan, other than a Special Hazard
     Loss in excess of the Combined Special Hazard Coverage, a Fraud Loss in
     excess of the Combined Fraud Coverage or a Bankruptcy Loss in excess of the
     Combined Bankruptcy Coverage, as applicable, provided that any amounts
     distributed in respect of losses pursuant to paragraph (I)(d)(i) or this
     paragraph (I)(d)(ii) of this definition of "REMIC II Distribution Amount"
     shall not cause a further reduction in any of the Class I-P Principal
     Balance, the Class II-P Principal Balance or the Class IV-P Principal
     Balance; provided, further, that if the amounts otherwise available to pay
     the Group C-B Subordinate Principal Distribution Amount for any such
     Distribution Date are insufficient to cover such outstanding principal
     losses for the Class I-P, Class II-P and Class IV-P Certificates as
     provided in paragraph (I)(d)(i) or this paragraph (I)(d)(ii) of this
     definition of "REMIC II Distribution Amount", then the amounts otherwise
     available to pay the Group C-B Subordinate Principal Distribution Amount
     will be allocated pro rata to the Class I-P, Class II-P and Class IV-P
     Certificates based on the amount such Certificates are entitled to receive
     pursuant to paragraph (I)(d)(i) or this paragraph (I)(d)(ii) of this
     definition of "REMIC II Distribution Amount";

          (iii)     third, to the Class C-B-1 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;


                                          68

<PAGE>


          (iv)      fourth, to the Class C-B-1 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (v)       fifth, to the Class C-B-1 Certificates, the portion of the
     Group C-B Subordinate Principal Distribution Amount allocable to such Class
     of Certificates pursuant to the definition of "Group C-B Subordinate
     Principal Distribution Amount", until the Class C-B-1 Principal Balance has
     been reduced to zero;

          (vi)      sixth, to the Class C-B-2 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (vii)     seventh, to the Class C-B-2 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (viii)    eighth, to the Class C-B-2 Certificates, the portion of the
     Group C-B Subordinate Principal Distribution Amount allocable to such Class
     of Certificates pursuant to the definition of "Group C-B Subordinate
     Principal Distribution Amount", until the Class C-B-2 Principal Balance has
     been reduced to zero;

          (ix)      ninth, to the Class C-B-3 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (x)       tenth, to the Class C-B-3 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (xi)      eleventh, to the Class C-B-3 Certificates, the portion of
     the Group C-B Subordinate Principal Distribution Amount allocable to such
     Class of Certificates pursuant to the definition of "Group C-B Subordinate
     Principal Distribution Amount", until the Class C-B-3 Principal Balance has
     been reduced to zero;

          (xii)     twelfth, to the Class C-B-4 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (xiii)    thirteenth, to the Class C-B-4 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (xiv)     fourteenth, to the Class C-B-4 Certificates, the portion of
     the Group C-B Subordinate Principal Distribution Amount allocable to such
     Class of Certificates pursuant to the definition of "Group C-B Subordinate
     Principal Distribution Amount", until the Class C-B-4 Principal Balance has
     been reduced to zero;

          (xv)      fifteenth, to the Class C-B-5 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (xvi)     sixteenth, to the Class C-B-5 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

                                          69
<PAGE>

          (xvii)    seventeenth, to the Class C-B-5 Certificates, the portion of
     the Group C-B Subordinate Principal Distribution Amount allocable to such
     Class of Certificates pursuant to the definition of "Group C-B Subordinate
     Principal Distribution Amount", until the Class C-B-5 Principal Balance has
     been reduced to zero;

          (xviii)   eighteenth, to the Class C-B-6 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (xix)     nineteenth, to the Class C-B-6 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (xx)      twentieth, to the Class C-B-6 Certificates, the portion of
     the Group C-B Subordinate Principal Distribution Amount allocable to such
     Class of Certificates pursuant to the definition of "Group C-B Subordinate
     Principal Distribution Amount", until the Class C-B-6 Principal Balance 
     has been reduced to zero;

          (xxi)     twenty-first, to each Class of Group C-B Certificates in the
     order of seniority, the remaining portion, if any, of the REMIC II
     Available Distribution Amount for the Group I, Group II, Group IV and Group
     C-B Certificates, up to the amount of unreimbursed Realized Losses
     previously allocated to such Class, if any, provided that any amounts
     distributed in respect of losses pursuant to this paragraph (I)(d)(xxi) of
     this definition of "REMIC II Distribution Amount" shall not cause a further
     reduction in the Class Principal Balances of the Group C-B Certificates;
     and

          (xxii)    twenty-second, to the Class R-2 Certificates, the Residual
     Distribution Amount for the Group I, Group II, Group IV and Group C-B
     Certificates for such Distribution Date.

     Notwithstanding the foregoing:

     (X) on any Distribution Date occurring on or after the date on which the 
aggregate Class Principal Balance of one or more of the Class I-A-1, Class 
II-A-1 or Group IV-A Certificates have been reduced to zero, the remaining 
Class A Certificates of the other Certificate Group or Groups will be 
entitled to receive as principal, in addition to any principal payments 
otherwise described above, all principal received or advanced with respect to 
the Mortgage Loans in the Loan Group or Groups relating to the Class A 
Certificates that have been paid in full (after distributions of principal to 
the related Class P Certificates pursuant to paragraph (I)(a)(i), (I)(b)(i) 
or (I)(c)(i) of this definition of "REMIC II Distribution Amount", if 
applicable), which amounts will be paid in accordance with paragraphs 
(I)(a)(iv), (I)(b)(iv) or (I)(c)(iv) of this definition of "REMIC II 
Distribution Amount", as applicable, to the extent of and in reduction of the 
Class Principal Balances thereof, prior to any distributions of principal to 
the Group C-B Certificates in paragraph (I)(d) of this definition of "REMIC 
II Distribution Amount", provided, however, that if there are two Certificate 
Groups with outstanding Class A Certificates, then such principal will be 
distributed among those Class A Certificates pro rata according to their 
Class Principal Balances; provided, further, that principal will not be 
distributed as set forth above if on such Distribution Date (a) the Group C-B 
Percentage for such Distribution Date is greater than or 

                                          70
<PAGE>

equal to 200% of the Group C-B Percentage as of the Closing Date and (b) the
average outstanding principal balance of the Mortgage Loans in either Loan Group
I, Loan Group II or Loan Group IV delinquent 60 days or more over the last six
months (including Mortgage Loans in foreclosure and Mortgage Loans the property
of which is held by the REMIC I Trust Fund and acquired by foreclosure or deed
in lieu of foreclosure), as a percentage of the related Group C-B Loan Group
Component Balance, is less than 50%; and 

     (Y) if on any Distribution Date the aggregate Class Principal Balance of
one or more of the Class I-A-1, Class II-A-1 or Group IV-A Certificates is
greater than the aggregate Principal Balance of the Mortgage Loans in the
related Loan Group less the applicable Class P Fraction of any Class P Mortgage
Loans in such Loan Group (each such Loan Group, an "Undercollateralized Group"
and each of the other Loan Groups, an "Overcollateralized Group"), then (i) (a)
if there is exactly one Undercollateralized Group, the portion of the REMIC II
Available Distribution Amount in respect of principal on the Mortgage Loans on
the Overcollateralized Groups (after distributions of principal to the Class A
and Class P Certificates of the Overcollateralized Groups) will be distributed
to the Class A Certificates of the Undercollateralized Group pursuant to
paragraph (I)(a)(iv), (I)(b)(iv) or (I)(c)(iv) of this definition of "REMIC II
Distribution Amount", as applicable, until the Undercollateralized Amount for
such Loan Group equals zero and (b) if there are two Undercollateralized Groups,
then the portion of the REMIC II Available Distribution Amount in respect of
principal on the Mortgage Loans in the Overcollateralized Group (after
distributions of principal to the Class A and Class P Certificates of the
Overcollateralized Group) will be distributed to the Class A Certificates of
both Undercollateralized Groups pursuant to paragraph (I)(a)(iv), (I)(b)(iv) or
(I)(c)(iv) of this definition of "REMIC II Distribution Amount", as applicable,
pro rata according to the Undercollateralized Amount of each such Loan Group
until the Undercollateralized Amount for each such Loan Group equals zero and
(ii) the REMIC II Available Distribution Amount of the Overcollateralized Group
or Groups will be further reduced (after distributions to the Overcollateralized
Group or Groups pursuant to paragraphs (I)(a)(i) through (I)(a)(iii), (I)(b)(i)
through (I)(b)(iii) or (I)(c)(i) through (I)(c)(iii), as applicable) in an
amount equal to one month's interest on the Undercollateralized Amount of each
such Undercollateralized Group at 7.000% per annum if the Undercollateralized
Group is Loan Group I, at the Class II-A-1 Remittance Rate if the
Undercollateralized Group is Loan Group II and at 6.750% per annum if the
Undercollateralized Group is Loan Group IV, plus any shortfall of interest on
the Class A Certificates of the Undercollateralized Group remaining unpaid
pursuant to paragraphs (I)(a)(ii), (I)(b)(ii) or (I)(c)(ii) of this definition
of "REMIC II Distribution Amount", as applicable, including accrued and unpaid
interest on such shortfall at the rate set forth above, and such amount will (1)
be added to the REMIC II Available Distribution Amount of each such
Undercollateralized Group and distributed in accordance with the priorities as
set forth in paragraphs (I)(a), (I)(b) or (I)(c) of this definition of "REMIC II
Distribution Amount", as applicable and (2) be subtracted from the REMIC II
Available Distribution Amount of the Overcollateralized Group or Groups;
provided however, that in the case of clause (i) and clause (ii) of this
paragraph (Y), if there are two Overcollateralized Groups, the REMIC II
Available Distribution Amount for the related Loan Groups will be reduced pro
rata according to the Senior Overcollateralized Amount of each such
Overcollateralized Group; provided, further that in no case will the REMIC II
Available Distribution Amount for an Overcollateralized Group be so 

                                          71
<PAGE>

reduced by more than the sum of (a) the portion of the REMIC II Available
Distribution Amount in respect of principal on such Overcollateralized Group
(after distributions of principal to the Class P and Class A Certificates of
such Overcollateralized Group) and (b) interest on its Senior Overcollateralized
Amount at 7.000% per annum if the Overcollateralized Group is Loan Group I, at
the Class II-A-1 Remittance Rate if the Overcollateralized Group is Loan Group
II and at 6.750% per annum if the Overcollateralized Group is Loan Group IV (in
each case, after distributions of interest to the Class A Certificates of such
Overcollateralized Group).

     (e)   With respect to the Group III and Class R-2 Certificates, on any
Distribution Date prior to the Group III Credit Support Depletion Date, to the
extent of the REMIC II Available Distribution Amount for the Group III
Certificates remaining following prior distributions, if any, on such
Distribution Date:

          (i)       first, to the Class III-P Certificates, the aggregate for
     all Class III-P Mortgage Loans of the product for each Class III-P Mortgage
     Loan of the applicable Class III-P Fraction and the sum of (x) scheduled
     payments of principal on such Class III-P Mortgage Loan due on or before
     the related Due Date in respect of which no distribution has been made on
     any previous Distribution Date and which were received by the Determination
     Date, or which have been advanced as part of a Monthly P&I Advance with
     respect to such Distribution Date, (y) the principal portion received in
     respect of such Class III-P Mortgage Loan during the Prior Period of (1)
     Curtailments, (2) Insurance Proceeds, (3) the amount, if any, of the
     principal portion of the Purchase Price paid pursuant to a Purchase
     Obligation or any repurchase of a Mortgage Loan permitted hereunder and (4)
     Liquidation Proceeds and (z) the principal portion of Payoffs received in
     respect of such Class III-P Mortgage Loan during the Payoff Period;

          (ii)      second, to the Group III-A and Group III-X Certificates,
     concurrently, the sum of the Interest Distribution Amounts for such Classes
     of Certificates remaining unpaid from previous Distribution Dates, pro rata
     according to their respective shares of such unpaid amounts; provided,
     however, that (a) on or before the Class III-A-11 Accretion Termination
     Date, the amount that would otherwise be payable to the Class III-A-11
     Certificates pursuant to this clause (I)(e)(ii) will be paid instead as
     principal as set forth in clause (I)(e)(iii)(b) of this definition of
     "REMIC II Distribution Amount", (b) on or before the Class III-A-16
     Accretion Termination Date, the amount that would otherwise be payable to
     the Class III-A-16 Certificates pursuant to this clause (I)(e)(ii) will be
     paid instead as principal as set forth in clause (I)(e)(iii)(c) of this
     definition of "REMIC II Distribution Amount" and (c) on or before the Class
     III-A-17 Accretion Termination Date, the amount that would otherwise be
     payable to the Class III-A-17 Certificates pursuant to this clause
     (I)(e)(ii) will be paid instead as principal as set forth in clause
     (I)(e)(iii)(d) of this definition of "REMIC II Distribution Amount";

          (iii)     third, 

                    (a)  to the Group III-A and Group III-X Certificates,
          concurrently, the sum of the Interest Distribution Amounts for such
          Classes of Certificates for the current Distribution Date, pro rata
          according to their respective Interest 

                                          72
<PAGE>

          Distribution Amounts; provided, however, that (1) on or before the
          Class III-A-11 Accretion Termination Date, the amount that would
          otherwise be payable to the Class III-A-11 Certificates pursuant to
          this clause (I)(e)(iii)(a) will be paid instead as principal as set
          forth in clause (I)(e)(iii)(b) of this definition of "REMIC II
          Distribution Amount", (2) on or before the Class III-A-16 Accretion
          Termination Date, the amount that would otherwise be payable to the
          Class III-A-16 Certificates pursuant to this clause (I)(e)(iii)(a)
          will be paid instead as principal as set forth in clause
          (I)(e)(iii)(c) of this definition of "REMIC II Distribution Amount"
          and (3) on or before the Class III-A-17 Accretion Termination Date,
          the amount that would otherwise be payable to the Class III-A-17
          Certificates pursuant to this clause (I)(e)(iii)(a) will be paid
          instead as principal as set forth in clause (I)(e)(iii)(d) of this
          definition of "REMIC II Distribution Amount"; 

                    (b)  on or before the Class III-A-11 Accretion Termination
          Date, the Class III-A-11 Accrual Amount, as principal, as follows: 

                         (1)  first, to the Class III-A-9 Certificates and
                    Component III-A-10-1, pro rata, to the extent necessary to
                    reduce the Class III-A-9 Principal Balance and the Component
                    III-A-10-1 Principal Balance to their respective Targeted
                    Principal Balances for such Distribution Date; and

                         (2)  second, to the Class III-A-11 Certificates, until
                    the Class III-A-11 Principal Balance has been reduced to
                    zero;

                    (c)  on or before the Class III-A-16 Accretion Termination
          Date, the Class III-A-16 Accrual Amount, as principal, as follows: 

                         (1)  first, to the Class III-A-1 Certificates, until
                    the Class III-A-1 Principal Balance has been reduced to
                    zero; and

                         (2)  second, to the Class III-A-16 Certificates, until
                    the Class III-A-16 Principal Balance has been reduced to
                    zero; and

                    (d)  on or before the Class III-A-17 Accretion Termination
          Date, the Class III-A-17 Accrual Amount, as principal, as follows: 

                         (1)  first, to the Class III-A-15 and Class III-A-18
                    Certificates and Component III-A-10-2, pro rata, to the
                    extent necessary to reduce the Class III-A-15 Principal
                    Balance, the Class III-A-18 Principal Balance and the
                    Component III-A-10-2 Principal Balance to their respective
                    Targeted Principal Balances for such Distribution Date; and

                         (2)  second, to the Class III-A-17 Certificates, until
                    the Class III-A-17 Principal Balance has been reduced to
                    zero;

          (iv)      fourth, to the Group III-A Certificates, as principal, the
     Group III Senior Principal Distribution Amount, as follows;

                                          73
<PAGE>

                    (a)  first, concurrently, to the Lockout Certificates, an
          amount, up to the amount of the Group III Lockout Principal
          Distribution Amount for such Distribution Date, concurrently, until
          the Class III-A-12 Principal Balance has been reduced to zero: 

                         (1)  29.5781866378% to the Class III-A-12 
                    Certificates; and

                         (2)  70.4218133622%, sequentially, as follows:

                                   (A)  first, to the Class III-A-6
                              Certificates, until the Class III-A-6 Principal
                              Balance has been reduced to zero;

                                   (B)  second, to the Class III-A-7
                              Certificates, until the Class III-A-7 Principal
                              Balance has been reduced to zero; and

                                   (C)  third, to the Class III-A-4
                              Certificates, until the Class III-A-4 Principal
                              Balance has been reduced to zero;

                    (b)  second, concurrently, the portion of the Group III
          Senior Principal Distribution Amount remaining after the distribution
          set forth above, concurrently, until the Class III-A-16 Principal
          Balance has been reduced to zero:

                         (1)  56.6153071681%, sequentially, as follows:

                                   (A)  first, concurrently until the 
                              Class III-A-14 Principal Balance has been 
                              reduced to zero:

                                        (I)  6.8745633534% to the Class III-A-14
                                   Certificates; and

                                        (II) 93.1254366466%, sequentially, as
                                   follows:

                                             (x)  first, to the Class III-A-1
                                        Certificates, until the Class III-A-1
                                        Principal Balance has been reduced to
                                        zero; and

                                             (y)  second, to the Class III-A-16
                                        Certificates, until the Class III-A-16
                                        Principal Balance has been reduced to
                                        zero;

                                   (B)  second, to the Class III-A-1
                              Certificates, until the Class III-A-1 Principal
                              Balance has been reduced to zero; and

                                   (C)  third, to the Class III-A-16
                              Certificates, until the Class III-A-16 Principal
                              Balance has been reduced to zero;

                         (2)  15.1022095971%, sequentially, as follows:

                                          74
<PAGE>

                                   (A)  first, sequentially, until the aggregate
                              Class Principal Balance of the Class III-A-15,
                              Class III-A-17 and Class III-A-18 Certificates and
                              the aggregate Component Principal Balance of
                              Component III-A-8-2 and Component III-A-10-2 has
                              been reduced to $25,931,028.00:

                                        (I)    first, to Component III-A-8-2, to
                                   the extent necessary to reduce the Component
                                   III-A-8-2 Principal Balance to its Planned
                                   Principal Balance for such Distribution Date;

                                        (II)   second, to Component III-A-10-2
                                   and the Class III-A-15 and Class III-A-18
                                   Certificates, pro rata (after giving effect
                                   to the distribution of  the Class III-A-17
                                   Accrual Amount for such Distribution Date),
                                   to the extent necessary to reduce the
                                   Component III-A-10-2 Principal Balance, the
                                   Class III-A-15 Principal Balance and the
                                   Class III-A-18 Principal Balance to their
                                   respective Targeted Principal Balances for
                                   such Distribution Date;

                                        (III)  third, to the Class III-A-17
                                   Certificates, until the Class III-A-17
                                   Principal Balance has been reduced to zero;

                                        (IV)   fourth, to Component III-A-10-2
                                   and the Class III-A-15 and Class III-A-18
                                   Certificates, pro rata, until the Component
                                   III-A-10-2 Principal Balance, the 
                                   Class III-A-15 Principal Balance and the 
                                   Class III-A-18 Principal Balance have been 
                                   reduced to zero; and

                                        (V)    fifth, to Component III-A-8-2,
                                   until the Component III-A-8-2 Principal
                                   Balance has been reduced to zero;

                                   (B)  second, concurrently, until the Class
                              III-A-13 Principal Balance has been reduced to
                              zero:

                                        (I)    47.6969696970% to the 
                                        Class III-A-13 Certificates; and

                                        (II)   52.3030303030%, sequentially, as
                                        follows: 

                                               (v)     first, to Component 
                                        III-A-8-2, to the extent necessary to 
                                        reduce the Component III-A-8-2 Principal
                                        Balance to its Planned Principal Balance
                                        for such Distribution Date;

                                               (w)     second, to Component 
                                        III-A-10-2 and the Class III-A-15 and 
                                        Class III-A-18 Certificates, pro rata, 
                                        to the extent necessary to reduce the 
                                        Component III-A-10-2 Principal Balance, 
                                        the Class III-A-15 Principal Balance and

                                          75
<PAGE>

                                        the Class III-A-18 Principal Balance to
                                        their respective Targeted Principal
                                        Balances for such Distribution Date;

                                               (x)     third, to the 
                                        Class III-A-17 Certificates, until the 
                                        Class III-A-17 Principal Balance has 
                                        been reduced to zero;

                                               (y)     fourth, to 
                                        Component III-A-10-2 and the 
                                        Class III-A-15 and Class III-A-18 
                                        Certificates, pro rata, until
                                        the Component III-A-10-2 Principal
                                        Balance, the Class III-A-15 Principal
                                        Balance and the Class III-A-18 
                                        Principal Balance have been reduced to 
                                        zero; and

                                               (z)     fifth, to Component 
                                        III-A-8-2, until the Component III-A-8-2
                                        Principal Balance has been reduced to 
                                        zero; and

                                   (C)  third, sequentially, as follows:

                                        (I)     first, to Component III-A-8-2,
                                   to the extent necessary to reduce the
                                   Component III-A-8-2 Principal Balance to its
                                   Planned Principal Balance for such
                                   Distribution Date;

                                        (II)    second, to Component III-A-10-2
                                   and the Class III-A-15 and Class III-A-18
                                   Certificates, pro rata, to the extent
                                   necessary to reduce the Component III-A-10-2
                                   Principal Balance, the Class III-A-15
                                   Principal Balance and the Class III-A-18
                                   Principal Balance to their respective
                                   Targeted Principal Balances for such
                                   Distribution Date;

                                        (III)   third, to the Class III-A-17
                                   Certificates, until the Class III-A-17
                                   Principal Balance has been reduced to zero;

                                        (IV)    fourth, to Component III-A-10-2
                                   and the Class III-A-15 and Class III-A-18
                                   Certificates, pro rata, until the Component
                                   III-A-10-2 Principal Balance, the 
                                   Class III-A-15 Principal Balance and the 
                                   Class III-A-18 Principal Balance have been 
                                   reduced to zero; and

                                        (V)     fifth, to Component III-A-8-2,
                                   until the Component III-A-8-2 Principal
                                   Balance has been reduced to zero;

                         (3)  26.2688552885%, sequentially, as follows:

                              (A)  first, to Component III-A-8-1, to the extent
                         necessary to reduce the Component III-A-8-1 Principal
                         Balance to its Planned Principal Balance for such
                         Distribution Date;

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<PAGE>

                              (B)  second, to Component III-A-10-1 and the Class
                         III-A-9 Certificates, pro rata (after giving effect to
                         the distribution of the Class III-A-11 Accrual Amount
                         for such Distribution Date), to the extent necessary to
                         reduce the Component III-A-10-1 Principal Balance and
                         the Class III-A-9 Principal Balance to their respective
                         Targeted Principal Balances for such Distribution Date;

                              (C)  third, to the Class III-A-11 Certificates,
                         until the Class III-A-11 Principal Balance has been
                         reduced to zero;

                              (D)  fourth, to Component III-A-10-1 and the Class
                         III-A-9 Certificates, pro rata, until the Component
                         III-A-10-1 Principal Balance and the Class III-A-9
                         Principal Balance have been reduced to zero; and

                              (E)  fifth, to Component III-A-8-1, until the
                         Component III-A-8-1 Principal Balance has been reduced
                         to zero; and

                         (4)  2.0136279463% to the Class III-A-5 Certificates,
               until the Class III-A-5 Principal Balance has been reduced to 
               zero;

               (c)  third, concurrently, the portion of the Group III Senior
          Principal Distribution Amount remaining after the distributions set
          forth above, until the Class III-A-2 Principal Balance has been
          reduced to zero, as follows:

                    (1)  67.2321663470% to the Class III-A-2 Certificates;

                    (2)  7.0995161172%, sequentially, as follows:

                         (A)  first, to Component III-A-8-2, to the extent
                    necessary to reduce the Component III-A-8-2 Principal
                    Balance to its Planned Principal Balance for such
                    Distribution Date;

                         (B)  second, to Component III-A-10-2 and the 
                    Class III-A-15 and Class III-A-18 Certificates, 
                    pro rata (after giving effect to the distribution of 
                    the Class III-A-17 Accrual Amount for such Distribution 
                    to reduce the Component III-A-10-2 Principal Balance, the
                    Date), to the extent necessary Class III-A-15 Principal 
                    Balance and the Class III-A-18 Principal Balance to 
                    their respective Targeted Principal Balances for such 
                    Distribution Date;

                         (C)  third, to the Class III-A-17 Certificates, until
                    the Class III-A-17 Principal Balance has been reduced to
                    zero;

                         (D)  fourth, to Component III-A-10-2 and the 
                    Class III-A-15 and Class III-A-18 Certificates, pro rata, 
                    until the Component III-A-10-2 Principal Balance, the 
                    Class III-A-15 Principal Balance and the Class III-A-18 
                    Principal Balance have been reduced to zero; and

                                          77
<PAGE>

                         (E)  fifth, to Component III-A-8-2, until the Component
                    III-A-8-2 Principal Balance has been reduced to zero;

                    (3)  23.6057639138%, sequentially, as follows:

                         (A)  first, to Component III-A-8-1, to the extent
                    necessary to reduce the Component III-A-8-1 Principal
                    Balance to its Planned Principal Balance for such
                    Distribution Date;

                         (B)  second, to Component III-A-10-1 and the 
                    Class III-A-9 Certificates, pro rata (after giving effect 
                    to the distribution of  the Class III-A-11 Accrual Amount 
                    for such Distribution Date), to the extent necessary to 
                    reduce the Component III-A-10-1 Principal Balance and the 
                    Class III-A-9 Principal Balance to their respective 
                    Targeted Principal Balances for such Distribution Date;

                         (C)  third, to the Class III-A-11 Certificates, until
                    the Class III-A-11 Principal Balance has been reduced to
                    zero;

                         (D)  fourth, to Component III-A-10-1 and the 
                    Class III-A-9 Certificates, pro rata, until the 
                    Component III-A-10-1 Principal Balance and the 
                    Class III-A-9 Principal Balance have been reduced 
                    to zero; and

                         (E)  fifth, to Component III-A-8-1, until the 
                    Component III-A-8-1 Principal Balance has been reduced 
                    to zero; and

                    (4)  2.0625536220% to the Class III-A-5 Certificates, until
               the Class III-A-5 Principal Balance has been reduced to zero;

               (d)  fourth, to the Class III-A-3 Certificates, the portion of
          the Group III Senior Principal Distribution Amount remaining after 
          the distributions set forth above, until the Class III-A-3 Principal
          Balance has been reduced to zero; and

               (e)  fifth, to the Lockout Certificates, the portion of the 
          Group III Senior Principal Distribution Amount remaining after the
          distributions set forth above, concurrently, until the Class III-A-12
          Principal Balance has been reduced to zero: 

                    (1)  29.5781866378% to the Class III-A-12 Certificates; and

                    (2)  70.4218133622%, sequentially, as follows:

                         (A)  first, to the Class III-A-6 Certificates, until
                    the Class III-A-6 Principal Balance has been reduced to
                    zero;

                         (B)  second, to the Class III-A-7 Certificates, until
                    the Class III-A-7 Principal Balance has been reduced to
                    zero; and

                                          78
<PAGE>

                         (C)  third, to the Class III-A-4 Certificates, until
                    the Class III-A-4 Principal Balance has been reduced to
                    zero; 

          (v)       fifth, to the Class III-P Certificates, to the extent of
     amounts otherwise available to pay the Group III Subordinate Principal
     Distribution Amount (without regard to clause (B) of the definition
     thereof) on such Distribution Date, the amount payable to the Class III-P
     Certificates on previous Distribution Dates pursuant to clause (I)(e)(vi)
     of this definition of "REMIC II Distribution Amount" and remaining unpaid
     from such previous Distribution Dates;
          
          (vi)      sixth, to the Class III-P Certificates, to the extent of
     amounts otherwise available to pay the Group III Subordinate Principal
     Distribution Amount (without regard to clause (B) of the definition
     thereof) on such Distribution Date, an amount equal to the Class III-P
     Fraction of any Realized Loss on a Class III-P Mortgage Loan, other than a
     Special Hazard Loss, Fraud Loss or Bankruptcy Loss in excess of the Group
     III Special Hazard Coverage, Group III Fraud Coverage or Group III
     Bankruptcy Coverage, as applicable, provided that any amounts distributed
     in respect of losses pursuant to paragraph (I)(e)(v) or this paragraph
     (I)(e)(vi) of this definition of "REMIC II Distribution Amount" shall not
     cause a further reduction in the Class III-P Principal Balance;

          (vii)     seventh, to the Class III-B-1 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (viii)    eighth, to the Class III-B-1 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (ix)      ninth, to the Class III-B-1 Certificates, the portion of the
     Group III Subordinate Principal Distribution Amount allocable to such Class
     of Certificates pursuant to the definition of "Group III Subordinate
     Principal Distribution Amount", until the Class III-B-1 Principal Balance
     has been reduced to zero;

          (x)       tenth, to the Class III-B-2 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (xi)      eleventh, to the Class III-B-2 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (xii)     twelfth, to the Class III-B-2 Certificates, the portion of
     the Group III Subordinate Principal Distribution Amount allocable to such
     Class of Certificates pursuant to the definition of "Group III Subordinate
     Principal Distribution Amount", until the Class III-B-2 Principal Balance
     has been reduced to zero;

          (xiii)    thirteenth, to the Class III-B-3 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (xiv)     fourteenth, to the Class III-B-3 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

                                          79
<PAGE>

          (xv)      fifteenth, to the Class III-B-3 Certificates, the portion of
     the Group III Subordinate Principal Distribution Amount allocable to such
     Class of Certificates pursuant to the definition of "Group III Subordinate
     Principal Distribution Amount", until the Class III-B-3 Principal Balance
     has been reduced to zero;

          (xvi)     sixteenth, to the Class III-B-4 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (xvii)    seventeenth, to the Class III-B-4 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (xviii)   eighteenth, to the Class III-B-4 Certificates, the portion
     of the Group III Subordinate Principal Distribution Amount allocable to
     such Class of Certificates pursuant to the definition of "Group III
     Subordinate Principal Distribution Amount", until the Class III-B-4
     Principal Balance has been reduced to zero;

          (xix)     nineteenth, to the Class III-B-5 Certificates, the Interest
     Distribution Amount for such Class of Certificates remaining unpaid from
     previous Distribution Dates;

          (xx)      twentieth, to the Class III-B-5 Certificates, the Interest
     Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (xxi)     twenty-first, to the Class III-B-5 Certificates, the portion
     of the Group III Subordinate Principal Distribution Amount allocable to
     such Class of Certificates pursuant to the definition of "Group III
     Subordinate Principal Distribution Amount", until the Class III-B-5
     Principal Balance has been reduced to zero;

          (xxii)    twenty-second, to the Class III-B-6 Certificates, the
     Interest Distribution Amount for such Class of Certificates remaining
     unpaid from previous Distribution Dates;

          (xxiii)   twenty-third, to the Class III-B-6 Certificates, the
     Interest Distribution Amount for such Class of Certificates for the current
     Distribution Date;

          (xxiv)    twenty-fourth, to the Class III-B-6 Certificates, the
     portion of the Group III Subordinate Principal Distribution Amount
     allocable to such Class of Certificates pursuant to the definition of
     "Group III Subordinate Principal Distribution Amount", until the 
     Class III-B-6 Principal Balance has been reduced to zero;

          (xxv)     twenty-fifth, to each Class of Group III-B Certificates in
     the order of seniority, the remaining portion, if any, of the REMIC II
     Available Distribution Amount for the Group III Certificates, up to the
     amount of unreimbursed Realized Losses previously allocated to such Class,
     if any, provided that any amounts distributed pursuant to this paragraph
     (I)(e)(xxv) of this definition of "REMIC II Distribution Amount" shall not
     cause a further reduction in the Class Principal Balances of the 
     Group III-B Certificates; and

                                          80
<PAGE>

          (xxvi)    twenty-sixth, to the Class R-2 Certificates, the Residual
     Distribution Amount for the Group III Certificates for such Distribution
     Date.

     (II) For any Distribution Date on or after the Combined Credit Support
Depletion Date or the Group III Credit Support Depletion Date, as applicable,
the REMIC II Available Distribution Amount for each Certificate Group shall be
distributed to the outstanding Classes of Certificates of such Certificate Group
in the following amounts and priority:

     (a)  With respect to the Group I and Class R-2 Certificates, on each
Distribution Date on or after the Combined Credit Support Depletion Date, to the
extent of the REMIC II Available Distribution Amount for the Group I
Certificates remaining following prior distributions, if any, on such
Distribution Date:

          (i)       first, to the Class I-P Certificates, principal in the
     amount that would otherwise be distributed to such Class on such
     Distribution Date pursuant to clause (I)(a)(i) of this definition of "REMIC
     II Distribution Amount";

          (ii)      second, to the Class I-A-1 and Class I-X Certificates, the
     amount payable to each such Class of Certificates on prior Distribution
     Dates pursuant to clause (I)(a)(ii) or (II)(a)(iii) of this definition of
     "REMIC II Distribution Amount", and remaining unpaid, pro rata according to
     such amounts, payable to the extent of amounts available therefor;

          (iii)     third, to the Class I-A-1 and Class I-X Certificates, the
     sum of the Interest Distribution Amounts for such Classes of Certificates
     for the current Distribution Date, pro rata according to their respective
     Interest Distribution Amounts;

          (iv)      fourth, to the Class I-A-1 Certificates, the Group I Senior
     Principal Distribution Amount until the Class I-A-1 Principal Balance has
     been reduced to zero; 

          (v)       fifth, to the Class I-A-1 Certificates, any remaining
     amounts until the Class I-A-1 Principal Balance has been reduced to zero;
     and

          (vi)      sixth, to the Class R-2 Certificates, the Residual
     Distribution Amount for the Group I Certificates for such Distribution
     Date;

     (b)  With respect to the Group II and Class R-2 Certificates, on each
Distribution Date on or after the Combined Credit Support Depletion Date, to the
extent of the REMIC II Available Distribution Amount for the Group II
Certificates remaining following prior distributions, if any, on such
Distribution Date:

          (i)       first, to the Class II-P Certificates, principal in the
     amount that would otherwise be distributed to such Class on such
     Distribution Date pursuant to clause (I)(b)(i) of this definition of "REMIC
     II Distribution Amount";

          (ii)      second, to the Class II-A-1 and Class II-X Certificates, the
     amount payable to each such Class of Certificates on prior Distribution
     Dates pursuant to clause (I)(b)(ii) 

                                          81
<PAGE>

     or (II)(b)(iii) of this definition of "REMIC II Distribution Amount", and
     remaining unpaid, pro rata according to such amounts, payable to the extent
     of amounts available therefor;

          (iii)     third, to the Class II-A-1 and Class II-X Certificates, the
     sum of the Interest Distribution Amounts for such Classes of Certificates
     for the current Distribution Date, pro rata according to their respective
     Interest Distribution Amounts;

          (iv)      fourth, to the Class II-A-1 Certificates, the Group II
     Senior Principal Distribution Amount until the Class II-A-1 Principal
     Balance has been reduced to zero;

          (v)       fifth, to the Class II-A-1 Certificates, any remaining
     amounts until the Class II-A-1 Principal Balance has been reduced to zero;
     and

          (vi)      sixth, to the Class R-2 Certificates, the Residual
     Distribution Amount for the Group II Certificates for such Distribution
     Date;

     (c)  With respect to the Group III and Class R-2 Certificates, on each
Distribution Date on or after the Group III Credit Support Depletion Date, to
the extent of the REMIC II Available Distribution Amount for the Group III
Certificates remaining following prior distributions, if any, on such
Distribution Date:

          (i)       first, to the Class III-P Certificates, principal in the
     amount that would otherwise be distributed to such Class on such
     Distribution Date pursuant to clause (I)(e)(i) of this definition of "REMIC
     II Distribution Amount";

          (ii)      second, to the Group III-A and Group III-X Certificates, the
     amount payable to each such Class of Certificates on prior Distribution
     Dates pursuant to clause (I)(e)(ii) or (II)(c)(iii) of this definition of
     "REMIC II Distribution Amount", and remaining unpaid, pro rata according to
     such amounts, payable to the extent of amounts available therefor;

          (iii)     third, to the Group III-A and Group III-X Certificates, the
     Interest Distribution Amounts for such Classes of Certificates for the
     current Distribution Date, pro rata according to their respective Interest
     Distribution Amounts;

          (iv)      fourth, to the Group III-A Certificates, the Group III
     Senior Principal Distribution Amount, pro rata according to their
     respective Class Principal Balances; and

          (v)       fifth, to the Class R-2 Certificates, the Residual
     Distribution Amount for the Group III Certificates for such Distribution
     Date; and

     (d)  With respect to the Group IV and Class R-2 Certificates, on each
Distribution Date on or after the Combined Credit Support Depletion Date, to the
extent of the REMIC II Available Distribution Amount for the Group IV
Certificates remaining following prior distributions, if any, on such
Distribution Date:

                                          82

<PAGE>


          (i)       first, to the Class IV-P Certificates, principal in the
     amount that would otherwise be distributed to such Class on such
     Distribution Date pursuant to clause (I)(c)(i) of this definition of "REMIC
     II Distribution Amount";

          (ii)      second, to the Group IV-A, Class R-2 and Class IV-X
     Certificates, the amount payable to each such Class of Certificates on
     prior Distribution Dates pursuant to clause (I)(c)(ii) or (II)(d)(iii) of
     this definition of "REMIC II Distribution Amount", and remaining unpaid,
     pro rata according to such amounts, payable to the extent of amounts
     available therefor;

          (iii)     third, to the Group IV-A, Class R-2 and Class IV-X
     Certificates, the Interest Distribution Amounts for such Classes of
     Certificates for the current Distribution Date, pro rata according to their
     respective Interest Distribution Amounts;

          (iv)      fourth, to the Group IV-A and Class R-2 Certificates, the
     Group IV Senior Principal Distribution Amount, pro rata according to their
     respective Class Principal Balances;

          (v)       fifth, to the Group IV-A and Class R-2 Certificates, pro
     rata, any remaining amounts until the aggregate Class Principal Balance of
     the Group IV-A and Class R-2 Certificates has been reduced to zero; and

          (vi)      sixth, to the Class R-2 Certificates, the Residual
     Distribution Amount for the Group IV Certificates for such Distribution
     Date.

     Notwithstanding the foregoing and prior to any distributions pursuant to 
paragraphs (II)(a)(v) and (II)(a)(vi), paragraphs (II)(b)(v) and (II)(b)(vi) 
and paragraphs (II)(d)(v) and (II)(d)(vi) of this definition of "REMIC II 
Distribution Amount", as applicable, if on any Distribution Date the 
aggregate Class Principal Balance of one or more of the Class I-A-1, Class 
II-A-1 or Group IV-A Certificates is greater than the aggregate Principal 
Balance of the Mortgage Loans in the related Loan Group less the applicable 
Class P Fraction of any Class P Mortgage Loans in such Loan Group (each such 
Loan Group, an "Undercollateralized Group" and each of the other Loan Groups, 
an "Overcollateralized Group"), then (i) (a) if there is exactly one 
Undercollateralized Group, the portion of the REMIC II Available Distribution 
Amount in respect of principal on the Mortgage Loans on the 
Overcollateralized Groups (after distributions of principal to the Class A 
and Class P Certificates of the Overcollateralized Groups pursuant to 
paragraphs (II)(a)(iv), (II)(b)(iv) and (II)(d)(iv) of this definition of 
"REMIC II Distribution Amount", as applicable) will be distributed to the 
Class A Certificates of the Undercollateralized Group pursuant to paragraph 
(II)(a)(iv), (II)(b)(iv) or (II)(d)(iv) of this definition of "REMIC II 
Distribution Amount", as applicable, until the Undercollateralized Amount for 
such Loan Group equals zero and (b) if there are two Undercollateralized 
Groups, then the portion of the REMIC II Available Distribution Amount in 
respect of principal on the Mortgage Loans in the Overcollateralized Group 
(after distributions of principal to the Class A and Class P Certificates of 
the Overcollateralized Group pursuant to paragraphs (II)(a)(iv), (II)(b)(iv) 
or (II)(d)(iv) of this definition of "REMIC II Distribution Amount", as 
applicable) will be distributed to the Class A Certificates of both 
Undercollateralized Groups pursuant to paragraph (II)(a)(iv), (II)(b)(iv) or 

                                          83
<PAGE>

(II)(d)(iv) of this definition of "REMIC II Distribution Amount", as 
applicable, pro rata according to the Undercollateralized Amount of each such 
Loan Group until the Undercollateralized Amount for each such Loan Group 
equals zero and (ii) the REMIC II Available Distribution Amount of the 
Overcollateralized Group or Groups will be further reduced (after 
distributions to the Overcollateralized Group or Groups pursuant to 
paragraphs (II)(a)(i) through (II)(a)(iii), (II)(b)(i) through (II)(b)(iii) 
or (II)(d)(i) through (II)(d)(iii), as applicable) in an amount equal to one 
month's interest on the Undercollateralized Amount of each such 
Undercollateralized Group at 7.000% per annum if the Undercollateralized 
Group is Loan Group I, at the Class II-A-1 Remittance Rate if the 
Undercollateralized Group is Loan Group II and at 6.750% per annum if the 
Undercollateralized Group is Loan Group IV, plus any shortfall of interest on 
the Class A Certificates of the Undercollateralized Group remaining unpaid 
pursuant to paragraphs (II)(a)(ii), (II)(b)(ii) or (II)(d)(ii) of this 
definition of "REMIC II Distribution Amount", as applicable, including 
accrued and unpaid interest on such shortfall at the rate set forth above, 
and such amount will (1) be added to the REMIC II Available Distribution 
Amount of each such Undercollateralized Group and distributed in accordance 
with the priorities as set forth in paragraphs (II)(a), (II)(b) or (II)(d) of 
this definition of "REMIC II Distribution Amount", as applicable and (2) be 
subtracted from the REMIC II Available Distribution Amount of the 
Overcollateralized Group or Groups; provided however, that in the case of 
clause (i) and clause (ii) of this paragraph, if there are two 
Overcollateralized Groups, the REMIC II Available Distribution Amount for the 
related Loan Groups will be reduced pro rata according to the Senior 
Overcollateralized Amount of each such Overcollateralized Group; provided, 
further that in no case will the REMIC II Available Distribution Amount for 
an Overcollateralized Group be so reduced by more than the sum of (a) the 
portion of the REMIC II Available Distribution Amount in respect of principal 
on such Overcollateralized Group (after distributions of principal to the 
Class P and Class A Certificates of such Overcollateralized Group pursuant to 
paragraphs (II)(a)(iv), (II)(b)(iv) or (II)(d)(iv) of this definition of 
"REMIC II Distribution Amount", as applicable) and (b) interest on its Senior 
Overcollateralized Amount at 7.000% per annum if the Overcollateralized Group 
is Loan Group I, at the Class II-A-1 Remittance Rate if the 
Overcollateralized Group is Loan Group II and at 6.750% per annum if the 
Overcollateralized Group is Loan Group IV (in each case, after distributions 
of interest to the Class A Certificates of such Overcollateralized Group).

     REMIC II TRUST FUND: The REMIC II Trust Fund created pursuant to Section
2.05 of this Agreement. The REMIC II Trust Fund consists of the REMIC I Regular
Interests to be held by the Trustee for the benefit of the Holders from time to
time of the Certificates issued hereunder (other than the Class R-1
Certificates).

     REMITTANCE RATE: For each Class of Certificates or Component of the Class
III-A-8 Certificates and for each Class of the REMIC I Regular Interests, the
per annum rate set forth as the Remittance Rate for such Class or Component in
the Preliminary Statement hereto.

     RESIDUAL CERTIFICATES:  With respect to REMIC I, the Class R-1
Certificates, which are being issued in a single class, and with respect to
REMIC II, the Class R-2 Certificates, which are being issued in a single class.
The Class R-1 and Class R-2 Certificates are hereby designated the sole Class of
"residual interests" in REMIC I and REMIC II, respectively, for purposes of
Section 860G(a)(2) of the Code.


                                          84
<PAGE>

     RESIDUAL DISTRIBUTION AMOUNT: On any Distribution Date, with respect to the
Class R-1 Certificates, any portion of the REMIC I Available Distribution Amount
remaining after all distributions to the REMIC I Regular Interests and Class R-1
Certificates, or with respect to the Class R-2 Certificates, any portion of the
REMIC II Available Distribution Amount remaining after all distributions to the
Certificates (other than the Class R-1 Certificates). Upon termination of the
obligations created by this Agreement and the REMIC I Trust Fund and REMIC II
Trust Fund created hereby, the amounts which remain on deposit in the
Certificate Account after payment to the Holders of the REMIC I Regular
Interests of the amounts set forth in Section 9.01 of this Agreement, and
subject to the conditions set forth therein, shall be distributed to the Class
R-1 and Class R-2 Certificates in accordance with the preceding sentence of this
definition as if the date of such distribution were a Distribution Date.

     RESPONSIBLE OFFICER: When used with respect to the Trustee, any officer
assigned to and working in its Corporate Trust Department or similar group and
also, with respect to a particular matter, any other officer to whom such matter
is referred because of such officer's knowledge of and familiarity with the
particular subject.

     S&P: Standard & Poor's Ratings Services, a division of The McGraw-Hill
Companies, Inc., provided that at any time it be a Rating Agency.

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

     SECURITY AGREEMENT: With respect to a Cooperative Loan, the agreement or
mortgage creating a security interest in favor of the originator of the
Cooperative Loan in the related Cooperative Stock.

     SELLING AND SERVICING CONTRACT: (a) The contract (including the PNC
Mortgage Securities Corp. Selling Guide and PNC Mortgage Securities Corp.
Servicing Guide to the extent incorporated by reference therein) between the
Company and a Person relating to the sale of the Mortgage Loans to the Company
and the servicing of such Mortgage Loans for the benefit of the
Certificateholders, which contract is substantially in the form of Exhibit E
hereto, as such contract may be amended or modified from time to time; provided,
however, that any such amendment or modification shall not materially adversely
affect the interests and rights of Certificateholders and (b) any other similar
contract providing substantially similar rights and benefits as those provided
by the forms of contract attached as Exhibit E hereto.

     SENIOR CERTIFICATES: The Group I Certificates, the Group II Certificates,
the Group III Senior Certificates, the Group IV Certificates and the Residual
Certificates.

     SENIOR SUBORDINATE CERTIFICATES:  The Subordinate Certificates other than
the Junior Subordinate Certificates.

     SENIOR OVERCOLLATERALIZED AMOUNT:  With respect to Loan Group I, Loan Group
II and Loan Group IV on any Distribution Date, the excess, if any, of the
aggregate Principal Balance of the Mortgage Loans in such Loan Group (less the
applicable Class P Fraction of any Class P


                                          85
<PAGE>

Mortgage Loans in such Loan Group) over the aggregate Class Principal Balance of
the Class A Certificates of the related Certificate Group.

     SERVICER: A mortgage loan servicing institution to which the Master
Servicer has assigned servicing duties with respect to any Mortgage Loan under a
Selling and Servicing Contract; provided, however, the Master Servicer may
designate itself or one or more other mortgage loan servicing institutions as
Servicer upon termination of an initial Servicer's servicing duties.

     SERVICING FEE: For each Mortgage Loan, the fee paid to the Servicer thereof
to perform primary servicing functions for the Master Servicer with respect to
such Mortgage Loan, equal to the per annum rate set forth for each Mortgage Loan
in the Mortgage Loan Schedule on the outstanding Principal Balance of such
Mortgage Loan.

     SERVICING OFFICER: Any officer of the Master Servicer involved in, or
responsible for, the administration and servicing of the Mortgage Loans or the
Certificates, as applicable, whose name and specimen signature appear on a list
of servicing officers furnished to the Trustee by the Master Servicer, as such
list may from time to time be amended.

     SPECIAL HAZARD COVERAGE INITIAL AMOUNT: With respect to Loan Group I, Loan
Group II and Loan Group IV, $4,178,149, and with respect to Loan Group III,
$4,477,763.

     SPECIAL HAZARD LOSS: The occurrence of any direct physical loss or damage
to a Mortgaged Property not covered by a standard hazard maintenance policy with
extended coverage which is caused by or results from any cause except: (i) fire,
lightning, windstorm, hail, explosion, riot, riot attending a strike, civil
commotion, vandalism, aircraft, vehicles, smoke, sprinkler leakage, except to
the extent of that portion of the loss which was uninsured because of the
application of a co-insurance clause of any insurance policy covering these
perils; (ii) normal wear and tear, gradual deterioration, inherent vice or
inadequate maintenance of all or part thereof; (iii) errors in design, faulty
workmanship or materials, unless the collapse of the property or a part thereof
ensues and then only for the ensuing loss; (iv) nuclear reaction or nuclear
radiation or radioactive 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 this
definition of Special Hazard Loss; (v) hostile or warlike action in time of
peace or war, including action in hindering, combating or defending against an
actual, impending or expected attack (a) by any government of sovereign power
(de jure or de facto), or by an authority maintaining or using military, naval
or air forces, (b) by military, naval or air forces, or (c) by an agent of any
such government, power, authority or forces; (vi) any weapon of war employing
atomic fission or radioactive force whether in time of peace or war; (vii)
insurrection, rebellion, revolution, civil war, usurped power or action taken by
governmental authority in hindering, combating or defending against such
occurrence; or (viii) seizure or destruction under quarantine or customs
regulations, or confiscation by order of any government or public authority.

     STEP DOWN PERCENTAGE: For any Distribution Date, the percentage indicated
below:


                                          86
<PAGE>

<TABLE>
<CAPTION>

           Distribution Date Occurring In            Step Down Percentage
           ------------------------------            --------------------
           <S>                                       <C>
           May 1998 through April 2003                         0%
           May 2003 through April 2004                        30%
           May 2004 through April 2005                        40%
           May 2005 through April 2006                        60%
           May 2006 through April 2007                        80%
           May 2007 and thereafter                           100%
</TABLE>


     STRIPPED INTEREST RATE:  For each Group I Loan or Subgroup II-1 Loan, the
excess, if any, of the Pass-Through Rate for such Mortgage Loan over 7.000% and
for each Subgroup II-2 Loan, Group III Loan or Group IV Loan, the excess, if
any, of the Pass-Through Rate for such Mortgage Loan over 6.750%.

     SUBGROUP:  The Subgroup II-1 Loans and the Subgroup II-2 Loans, as
applicable.

     SUBGROUP II-1 LOAN: Any Group II Loan which is designated as such on the
Mortgage Loan Schedule.

     SUBGROUP II-1 PREMIUM RATE MORTGAGE LOANS:  The Subgroup II-1 Loans having
Pass-Through Rates in excess of 7.000% per annum.

     SUBGROUP II-2 LOAN: Any Group II Loan which is designated as such on the
Mortgage Loan Schedule.

     SUBGROUP II-2 PREMIUM RATE MORTGAGE LOANS:  The Subgroup II-2 Loans having
Pass-Through Rates in excess of 6.750% per annum.

     SUBGROUP III-1 LOAN: Any Group III Loan which is designated as such on the
Mortgage Loan Schedule.

     SUBGROUP III-2 LOAN: Any Group III Loan which is designated as such on the
Mortgage Loan Schedule.

     SUBORDINATE CERTIFICATES:  The Class B Certificates.

     SUBORDINATION LEVEL: On any specified date, with respect to any of the
Group C-B Certificates, the percentage obtained by dividing the sum of the Class
Principal Balances of the Classes of Certificates which are subordinate in right
of payment to such Class (provided that no Class of Group C-B Certificates shall
be subordinate in right of payment to the Class C-B-6 Certificates) by the
aggregate Class Principal Balances of the Group I, Group II, Group IV and Group
C-B Certificates as of such date prior to giving effect to distributions of
principal or interest or allocations of Realized Losses on the Group I, Group II
and Group IV Loans on such date. On any specified date, with respect to any of
the Group III-B Certificates, the percentage obtained by dividing the sum of the
Class Principal Balances of the Classes of Certificates which


                                          87
<PAGE>

are subordinate in right of payment to such Class (provided that no Class of
Group III-B Certificates shall be subordinate in right of payment to the Class
III-B-6 Certificates) by the aggregate Class Principal Balances of the Group III
Certificates as of such date prior to giving effect to distributions of
principal or interest or allocations of Realized Losses on the Group III Loans
on such date.

     SUBSTITUTE MORTGAGE LOAN: A Mortgage Loan which is substituted for another
Mortgage Loan pursuant to and in accordance with the provisions of Section 2.02.

     TARGETED PRINCIPAL BALANCE: The respective amounts set forth in the table
attached as Appendix B to the Prospectus, for the applicable Distribution Date,
for each of the Class III-A-9, Class III-A-15 and Class III-A-18 Certificates
and Component III-A-10-1 and Component III-A-10-2.

     TAX MATTERS PERSON: A Holder of the Class R-1 Certificate, with respect to
REMIC I, and  a Holder of the Class R-2 Certificate, with respect to REMIC II,
in each case holding a Certificate having an Authorized Denomination of at least
0.01% or any Permitted Transferee of such Class R-1 or Class R-2
Certificateholder designated as succeeding to the position of Tax Matters Person
with respect to the applicable trust fund in a notice to the Trustee signed by
authorized representatives of the transferor and transferee of such Class R-1 or
Class R-2 Certificate. If the Tax Matters Person for REMIC I or REMIC II becomes
a Disqualified Organization, the last preceding Holder of such Authorized
Denomination of the Class R-1 or Class R-2 Certificate, as applicable, that is
not a Disqualified Organization shall be Tax Matters Person for such trust
pursuant to Section 5.01(c). If any Person is appointed as tax matters person by
the Internal Revenue Service pursuant to the Code, such Person shall be Tax
Matters Person.

     TERMINATION DATE: The date upon which final payment of the Certificates
will be made pursuant to the procedures set forth in Section 9.01(b).

     TERMINATION PAYMENT: The final payment delivered to the Certificateholders
on the Termination Date pursuant to the procedures set forth in Section 9.01(b).

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

     TRANSFEREE: Any Person who is acquiring by Transfer any Ownership Interest
in a Residual Certificate.

     TRANSFEREE AFFIDAVIT AND AGREEMENT: An affidavit and agreement in the form
attached hereto as Exhibit J.

     TRUSTEE: U.S. Bank National Association, or its successor-in-interest as
provided in Section 8.09, or any successor trustee appointed as herein provided.

     UNCOLLECTED INTEREST: With respect to any Distribution Date for any
Mortgage Loan on which a Payoff was made by a Mortgagor during the related
Payoff Period, except for Payoffs received during the period from the first
through the 14th day of the month of such Distribution


                                          88
<PAGE>

Date, an amount equal to one month's interest at the applicable Pass-Through
Rate on such Mortgage Loan less the amount of interest actually paid by the
Mortgagor with respect to such Payoff.

     UNCOMPENSATED INTEREST SHORTFALL: With respect to a Loan Group, for any
Distribution Date, the excess, if any, of (i) the sum of (a) aggregate
Uncollected Interest with respect to the Mortgage Loans in the related Loan
Group and (b) aggregate Curtailment Shortfall with respect to the Mortgage Loans
in the related Loan Group over (ii) Compensating Interest with respect to such
Loan Group.

     Uncompensated Interest Shortfall for Loan Group I shall be allocated to the
Group I Certificates and the portion of the Group C-B Certificates that derives
its Interest Distribution Amount from the Group I Loans pro rata according to
the amount of the Interest Distribution Amount to which each such Class (or
portion thereof) would otherwise be entitled in reduction thereof.

     Uncompensated Interest Shortfall for Loan Group II shall be allocated to
the Group II Certificates and the portion of the Group C-B Certificates that
derives its Interest Distribution Amount from the Group II Loans pro rata
according to the amount of the Interest Distribution Amount to which each such
Class (or portion thereof) would otherwise be entitled in reduction thereof.

     Uncompensated Interest Shortfall for Loan Group IV shall be allocated to
the Group IV Certificates and the portion of the Group C-B Certificates that
derives its Interest Distribution Amount from the Group IV Loans pro rata
according to the amount of the Interest Distribution Amount to which each such
Class (or portion thereof) would otherwise be entitled in reduction thereof.

      Uncompensated Interest Shortfall for Loan Group III shall be allocated to
the Group III Certificates pro rata according to the amount of the Interest
Distribution Amount to which each such Class of Certificates would otherwise be
entitled in reduction thereof.

     Uncompensated Interest Shortfall for Loan Group I, Loan Group II and Loan
Group IV shall be allocated to the Class I-X-L, Class II-X-L, Class IV-X-L,
Class Y-1-L, Class Y-2-L, Class Y-3-L, Class Y-4-L, Class Z-1-L, Class Z-2-L,
Class Z-3-L and Class Z-4-L Regular Interests, pro rata according to the amount
of the Interest Distribution Amount to which each such Class of Regular
Interests would otherwise be entitled in reduction thereof.

     Uncompensated Interest Shortfall for Loan Group III shall be allocated to
the Class W-L and Group III-X-L Regular Interests, pro rata according to the
amount of the Interest Distribution Amount to which each such Class of Regular
Interests would otherwise be entitled in reduction thereof.

     UNDERCOLLATERALIZED AMOUNT: With respect to Loan Group I, Loan Group II and
Loan Group IV on each Distribution Date, the excess, if any, of the aggregate
Class Principal Balance of the Class A Certificates of the related Certificate
Group over the aggregate Principal Balance


                                          89
<PAGE>

of the Mortgage Loans in such loan group (less the applicable Class P Fraction
of any Class P Mortgage Loans in such Loan Group).

     UNDERWRITING STANDARDS: The underwriting standards of the Company,
Headlands Mortgage Company, First Chicago NBD Mortgage Company, Ohio Savings
Bank, Western Financial Savings Bank, FSB, National City Mortgage Company, Old
Kent Mortgage Company, Chase Manhattan Mortgage Corporation, Bank of America
National Trust and Savings Association, Washington Mutual and PNC Mortgage Corp.
of America.

     UNINSURED CAUSE: Any cause of damage to a Mortgaged Property, the cost of
the complete restoration of which is not fully reimbursable under the hazard
insurance policies required to be maintained pursuant to Section 3.07.

     U.S. PERSON: A citizen or resident of the United States, a corporation,
partnership or other entity created or organized in or under the laws of the
United States, any state thereof or the District of Columbia, or an estate or
trust that is subject to U.S. federal income tax regardless of the source of its
income.

     VA: The Department of Veterans Affairs, formerly known as the Veterans
Administration, or any successor thereto.

     WITHDRAWAL DATE: Any day during the period commencing on the 18th day of
the month of the related Distribution Date (or if such day is not a Business
Day, the immediately preceding Business Day) and ending on the last Business Day
prior to the 21st day of the month of such Distribution Date.

                                   ARTICLE II


      CONVEYANCE OF THE TRUST FUNDS; REMIC ELECTION AND DESIGNATIONS; ORIGINAL
                              ISSUANCE OF CERTIFICATES

     Section 2.01.  CONVEYANCE OF REMIC I; REMIC ELECTION AND DESIGNATIONS. A
trust ("REMIC I") of which the Trustee is the trustee is hereby created under
the laws of the State of New York for the benefit of the Holders of the REMIC I
Regular Interests and the Class R-1 Certificates.  The purpose of REMIC I is to
hold the REMIC I Trust Fund and provide for the issuance, execution and delivery
of the Class R-1 Certificates.  The assets of REMIC I shall consist of the REMIC
I Trust Fund.  REMIC I shall be irrevocable.

     The assets of REMIC I shall remain in the custody of the Trustee, on behalf
of REMIC I, and shall be kept in REMIC I.  Moneys to the credit of REMIC I shall
be held by the Trustee and invested as provided herein.  All assets received and
held in REMIC I will not be subject to any right, charge, security interest,
lien or claim of any kind in favor of U.S. Bank National Association in its own
right, or any Person claiming through it.  The Trustee, on behalf of REMIC I,
shall not have the power or authority to transfer, assign, hypothecate, pledge
or otherwise dispose of any of the assets of REMIC I to any Person, except as
permitted herein.  No creditor of a beneficiary of REMIC I, of the Trustee, of
the Master Servicer or of the Company shall have


                                          90
<PAGE>

any right to obtain possession of, or otherwise exercise legal or equitable
remedies with respect to, the property of REMIC I, except in accordance with the
terms of this Agreement.

     Concurrently with the execution and delivery hereof, the Company does
hereby irrevocably sell, transfer, assign, set over and otherwise convey to the
Trustee, in trust for the benefit of the Holders of REMIC I Regular Interests
and the Class R-1 Certificates, without recourse, all the Company's right, title
and interest in and to the REMIC I Trust Fund, including but not limited to (i)
all scheduled payments of principal and interest due after the Cut-Off Date and
received by the Company with respect to the Mortgage Loans at any time, and all
Principal Prepayments received by the Company after the Cut-Off Date with
respect to the Mortgage Loans (such transfer and assignment by the Company to be
referred to herein as the "Conveyance"). The Trustee hereby accepts REMIC I
created hereby and accepts delivery of the REMIC I Trust Fund on behalf of REMIC
I and acknowledges that it holds the Mortgage Loans for the benefit of the
Holders of the REMIC I Regular Interests and the Class R-1 Certificates issued
pursuant to this Agreement. It is the express intent of the parties hereto that
the Conveyance of the REMIC I Trust Fund to the Trustee by the Company as
provided in this Section 2.01 be, and be construed as, an absolute sale of the
REMIC I Trust Fund. It is, further, not the intention of the parties that such
Conveyance be deemed a pledge of the REMIC I Trust Fund by the Company to the
Trustee to secure a debt or other obligation of the Company. However, in the
event that, notwithstanding the intent of the parties, the REMIC I Trust Fund is
held to be the property of the Company, or if for any other reason this
Agreement is held or deemed to create a security interest in the REMIC I Trust
Fund, then

     (a)  this Agreement shall be deemed to be a security agreement;

     (b)  the Conveyance provided for in this Section 2.01 shall be deemed to be
a grant by the Company to the Trustee of a security interest in all of the
Company's right, title, and interest, whether now owned or hereafter acquired,
in and to:

     (I) All accounts, general intangibles, chattel paper, instruments,
documents, money, deposit accounts, certificates of deposit, goods, letters of
credit, advices of credit and investment property consisting of, arising from or
relating to any of the property described in (i), (ii) and (iii) below: (i) the
Mortgage Loans identified on the Mortgage Loan Schedule, including the related
Mortgage Notes, Mortgages, Cooperative Stock Certificates, and Cooperative
Leases, all Substitute Mortgage Loans and all distributions with respect to such
Mortgage Loans and Substitute Mortgage Loans payable on and after the Cut-Off
Date; (ii) the Certificate Account, and, to the extent relating to the Mortgage
Loans, the Investment Account,  the Custodial Accounts for P&I, the Custodial
Accounts for Reserves, and all money or other property held therein as relating
to the Mortgage Loans; and (iii) amounts paid or payable by the insurer under
any FHA insurance policy or any Primary Insurance Policy and proceeds of any VA
guaranty and any other insurance policy related to any Mortgage Loan or the
Mortgage Pool;

     (II) All accounts, general intangibles, chattel paper, instruments,
documents, money, deposit accounts, certificates of deposit, goods, letters of
credit, advices of credit, investment property, and other rights arising from or
by virtue of the disposition of, or collections with respect to, or insurance
proceeds payable with respect to, or claims against other persons with


                                          91
<PAGE>

respect to, all or any part of the collateral described in (I) above (including
any accrued discount realized on liquidation of any investment purchased at a
discount); and

     (III) All cash and non-cash proceeds of the collateral described in (I) and
(II) above;

     (c)  the possession by the Trustee of the Mortgage Notes, the Mortgages,
the Security Agreements, Assignments of Proprietary Lease, Cooperative Stock
Certificates, Cooperative Leases and such other goods, letters of credit,
advices of credit, instruments, money, documents, chattel paper or certificated
securities shall be deemed to be possession by the secured party or possession
by a purchaser for purposes of perfecting the security interest pursuant to the
Uniform Commercial Code (including, without limitation, Sections 9-305 and 9-115
thereof) as in force in the relevant jurisdiction; and

     (d)  notifications to persons holding such property, and acknowledgments,
receipts or confirmations from persons holding such property, shall be deemed to
be notifications to, or acknowledgments, receipts or confirmations from,
securities intermediaries, bailees or agents of, or persons holding for, the
Trustee, as applicable for the purpose of perfecting such security interest
under applicable law.

     The Company and the Trustee at the direction of the Company shall, to the
extent consistent with this Agreement, take such actions as may be necessary to
ensure that, if this Agreement were deemed to create a security interest in the
REMIC I Trust Fund, such security interest would be deemed to be a perfected
security interest of first priority under applicable law and will be maintained
as such throughout the term of the Agreement. In connection herewith, the
Trustee shall have all of the rights and remedies of a secured party and
creditor under the Uniform Commercial Code as in force in the relevant
jurisdiction.

     In connection with the sale, transfer and assignment referred to in the
first paragraph of this Section 2.01, the Company, concurrently with the
execution and delivery hereof, does deliver to, and deposit with, or cause to be
delivered to and deposited with, the Trustee or Custodian the Mortgage Files for
the Mortgage Loans, which shall on original issuance thereof and at all times be
registered in the name of the Trustee.

     Concurrently with the execution and delivery hereof, the Company shall
cause assignments of the Mortgage Loans to the Trustee to be recorded or filed,
except in states where, in the opinion of counsel admitted to practice in such
state acceptable to the Company, the Trustee and the Rating Agencies submitted
in lieu of such recording or filing, such recording or filing is not required to
protect the Trustee's interest in such Mortgage Loans against creditors of, or
against sale, further assignments, satisfaction or discharge by the Lender, a
Servicer, the Company or the Master Servicer, and the Company shall cause to be
filed the Form UCC-3 assignment and Form UCC-1 financing statement referred to
in clause (Y)(vii) and (ix), respectively, of the definition of "Mortgage File."
In connection with its servicing of Cooperative Loans, the Master Servicer will
use its best efforts to file timely continuation statements, if necessary, with
regard to each financing statement and assignment relating to Cooperative Loans.


                                          92
<PAGE>

     In instances where the original recorded Mortgage or any intervening
assignment thereof (recorded or in recordable form) relating to a Mortgage Loan
cannot be delivered by the Company to the Trustee prior to or concurrently with
the execution and delivery hereof (due to a delay on the part of the recording
office), the Company may, in lieu of delivering such original documents, deliver
to the Trustee a fully legible reproduction of the original Mortgage or
intervening assignment provided that the related Lender or originator certifies
on the face of such reproduction(s) or copy as follows: "Certified true and
correct copy of original which has been transmitted for recordation." For
purposes hereof, transmitted for recordation means having been mailed or
otherwise delivered for recordation to the appropriate authority. In all such
instances, the Company shall transmit the original recorded Mortgage and any
intervening assignments with evidence of recording thereon (or a copy of such
original Mortgage or intervening assignment certified by the applicable
recording office)(collectively, "Recording Documents") to the Trustee within 270
days after the execution and delivery hereof. In instances where, due to a delay
on the part of the recording office where any such Recording Documents have been
delivered for recordation, the Recording Documents cannot be delivered to the
Trustee within 270 days after execution and delivery hereof, the Company shall
deliver to the Trustee within such time period a certificate (a "Company
Officer's Certificate") signed by the Chairman of the Board, President, any Vice
President or Treasurer of the Company stating the date by which the Company
expects to receive such Recording Documents from the applicable recording
office. In the event that Recording Documents have still not been received by
the Company and delivered to the Trustee by the date specified in its previous
Company Officer's Certificate delivered to the Trustee, the Company shall
deliver to the Trustee by such date an additional Company Officer's Certificate
stating a revised date by which the Company expects to receive the applicable
Recording Documents. This procedure shall be repeated until the Recording
Documents have been received by the Company and delivered to the Trustee.

     In instances where, due to a delay on the part of the title insurer, a copy
of the title insurance policy for a particular Mortgage Loan cannot be delivered
to the Trustee prior to or concurrently with the execution and delivery hereof,
the Company shall provide a copy of such title insurance policy to the Trustee
within 90 days after the Company's receipt of the Recording Documents necessary
to issue such title insurance policy. In addition, the Company shall, subject to
the limitations set forth in the preceding sentence, provide to the Trustee upon
request therefor a duplicate title insurance policy for any Mortgage Loan.

     For Mortgage Loans for which the Company has received a Payoff after the
Cut-Off Date and prior to the date of execution and delivery hereof, the
Company, in lieu of delivering the above documents, herewith delivers to the
Trustee a certification of a Servicing Officer of the nature set forth in
Section 3.10.

     The Trustee is authorized, with the Master Servicer's consent, to appoint
any bank or trust company approved by and unaffiliated with each of the Company
and the Master Servicer as Custodian of the documents or instruments referred to
above in this Section 2.01, and to enter into a Custodial Agreement for such
purpose, provided, however, that the Trustee shall be and remain liable for the
acts of any such Custodian only to the extent that it is responsible for its own
acts hereunder.


                                          93
<PAGE>

     The Company and the Trustee agree that the Company, as agent for the Tax
Matters Person, shall, on behalf of the REMIC I Trust Fund, elect to treat the
REMIC I Trust Fund as a REMIC within the meaning of Section 860D of the Code
and, if necessary, under applicable state laws. Such election shall be included
in the Form 1066 and any appropriate state return to be filed on behalf of REMIC
I for its first taxable year.

     The Closing Date is hereby designated as the "startup day" of REMIC I
within the meaning of Section 860G(a)(9) of the Code.

     The regular interests (as set forth in the table contained in the
Preliminary Statement hereto) relating to the REMIC I Trust Fund are hereby
designated as "regular interests" for purposes of Section 860G(a)(1) of the
Code. The Class R-1 Certificates are being issued in a single Class, which is
hereby designated as the sole class of "residual interest" in the REMIC I Trust
Fund for purposes of Section 860G(a)(2) of the Code.

     The parties intend that the affairs of the REMIC I Trust Fund formed
hereunder shall constitute, and that the affairs of the REMIC I Trust Fund shall
be conducted so as to qualify the REMIC I Trust Fund as a REMIC. In furtherance
of such intention, the Company covenants and agrees that it shall act as agent
for the Tax Matters Person (and the Company is hereby appointed to act as agent
for such Tax Matters Person) on behalf of the REMIC I Trust Fund and that in
such capacity it shall: (a) prepare and file, or cause to be prepared and filed,
a federal tax return using a calendar year as the taxable year and using an
accrual method of accounting for the REMIC I Trust Fund when and as required by
the REMIC Provisions and other applicable federal income tax laws; (b) make an
election, on behalf of the trust, for the REMIC I Trust Fund to be treated as a
REMIC on the federal tax return of the REMIC I Trust Fund for its first taxable
year, in accordance with the REMIC Provisions; (c) prepare and forward, or cause
to be prepared and forwarded, to the Holders of the REMIC I Regular Interests
and the Class R-1 Certificates and the Trustee, all information reports as and
when required to be provided to them in accordance with the REMIC Provisions,
and make available the information necessary for the application of Section
860E(e) of the Code; (d) conduct the affairs of the REMIC I Trust Fund at all
times that any REMIC I Regular Interests are outstanding so as to maintain the
status of the REMIC I Trust Fund as a REMIC under the REMIC Provisions; (e) not
knowingly or intentionally take any action or omit to take any action that would
cause the termination of the REMIC status of the REMIC I Trust Fund; and (f) pay
the amount of any federal prohibited transaction penalty taxes imposed on the
REMIC I Trust Fund when and as the same shall be due and payable (but such
obligation shall not prevent the Company or any other appropriate person from
contesting any such tax in appropriate proceedings and shall not prevent the
Company from withholding payment of such tax, if permitted by law, pending the
outcome of such proceedings); provided, that the Company shall be entitled to be
indemnified by the REMIC I Trust Fund for any such prohibited transaction
penalty taxes if the Company's failure to exercise reasonable care was not the
primary cause of the imposition of such prohibited transaction penalty taxes.

     The Trustee and the Master Servicer shall promptly provide the Company with
such information as the Company may from time to time request for the purpose of
enabling the Company to prepare tax returns.


                                          94
<PAGE>

     In the event that a Mortgage Loan is discovered to have a defect which, had
such defect been discovered before the startup day, would have prevented such
Mortgage Loan from being a "qualified mortgage" within the meaning of Section
860G(a)(3) of the Code, and the Company does not repurchase such Mortgage Loan
within 90 days of such date, the Master Servicer, on behalf of the Trustee,
shall within 90 days of the date such defect is discovered sell such Mortgage
Loan at such price as the Master Servicer in its sole discretion, determines to
be the greatest price that will result in the purchase thereof within 90 days of
such date, unless the Master Servicer delivers to the Trustee an Opinion of
Counsel to the effect that continuing to hold such Mortgage Loan will not
adversely affect the status of the electing portion of the REMIC I Trust Fund as
a REMIC for federal income tax purposes.

     In the event that any tax is imposed on "prohibited transactions" of the
REMIC I Trust Fund as defined in Section 860F of the Code and not paid by the
Company pursuant to clause (f) of the third preceding paragraph, such tax shall
be charged against amounts otherwise distributable to the Class R-1
Certificateholders. Notwithstanding anything to the contrary contained herein,
the Trustee is hereby authorized to retain from amounts otherwise distributable
to the Class R-1 Certificateholders on any Distribution Date sufficient funds to
reimburse the Company in its capacity as agent for the Tax Matters Person for
the payment of such tax (upon the written request of the Company, to the extent
reimbursable, and to the extent that the Company has not been previously
reimbursed therefor).

     Section 2.02.  ACCEPTANCE BY TRUSTEE. The Trustee acknowledges receipt (or
with respect to any Mortgage Loan subject to a Custodial Agreement, receipt by
the Custodian thereunder) of the documents (or certified copies thereof as
specified in Section 2.01) referred to in Section 2.01 above, but without having
made the review required to be made within 45 days pursuant to this Section
2.02, and declares that as of the Closing Date it holds and will hold such
documents and the other documents constituting a part of the Mortgage Files
delivered to it, and the REMIC I Trust Fund, as Trustee in trust, upon the
trusts herein set forth, for the use and benefit of the Holders from time to
time of the REMIC I Regular Interests and Class R-1 Certificates. The Trustee
agrees, for the benefit of the Holders of the REMIC I Regular Interests and
Class R-1 Certificates, to review or cause the Custodian to review each Mortgage
File within 45 days after the Closing Date and deliver to the Company a
certification in the form attached as Exhibit M hereto, to the effect that all
documents required (in the case of instruments described in clauses (X)(vi) and
(Y)(x) of the definition of "Mortgage File", known by the Trustee to be
required) pursuant to the third paragraph of Section 2.01 have been executed and
received, and that such documents relate to the Mortgage Loans identified in the
Mortgage Loan Schedule. In performing such review, the Trustee may rely upon the
purported genuineness and due execution of any such document, and on the
purported genuineness of any signature thereon. The Trustee shall not be
required to make any independent examination of any documents contained in each
Mortgage File beyond the review specifically required herein. The Trustee makes
no representations as to: (i) the validity, legality, enforceability or
genuineness of any of the Mortgage Loans identified on the Mortgage Loan
Schedule, or (ii) the collectability, insurability, effectiveness or suitability
of any Mortgage Loan. If the Trustee finds any document or documents
constituting a part of a Mortgage File not to have been executed or received, or
to be unrelated to the Mortgage Loans identified in the Mortgage Loan Schedule,
the Trustee shall promptly so notify the Company. The Company hereby covenants
and agrees that, if any such defect cannot be corrected or cured, the


                                          95
<PAGE>

Company shall, not later than 60 days after the Trustee's notice to it
respecting such defect, within the three-month period commencing on the Closing
Date (or within the two-year period commencing on the Closing Date if the
related Mortgage Loan is a "defective obligation" within the meaning of Section
860G(a)(4)(B)(ii) of the Code and Treasury Regulation Section 1.860G-2(f)),
either (i) repurchase the related Mortgage Loan from the Trustee at the Purchase
Price, or (ii) substitute for any Mortgage Loan to which such defect relates a
different mortgage loan (a "Substitute Mortgage Loan") which is a "qualified
replacement mortgage" (as defined in the Code) and, (iii) after such three-month
or two-year period, as applicable, the Company shall repurchase the Mortgage
Loan from the Trustee at the Purchase Price but only if the Mortgage Loan is in
default or default is, in the judgment of the Company, reasonably imminent. If
such defect would cause the Mortgage Loan to be other than a "qualified
mortgage" (as defined in the Code), then notwithstanding the previous sentence,
repurchase or substitution must occur within the sooner of (i) 90 days from the
date the defect was discovered or (ii) in the case of substitution, two years
from the Closing Date.

     Such Substitute Mortgage Loan shall mature no later than, and not more than
two years earlier than, have a principal balance and Loan-to-Value Ratio equal
to or less than, and have a Pass-Through Rate on the date of substitution equal
to or no more than 1% greater than the Mortgage Loan being substituted for. If
the aggregate of the principal balances of the Substitute Mortgage Loans
substituted for a Mortgage Loan is less than the Principal Balance of such
Mortgage Loan, the Company shall pay the difference in cash to the Trustee for
deposit into the Certificate Account, and such payment by the Company shall be
treated in the same manner as proceeds of the repurchase by the Company of a
Mortgage Loan pursuant to this Section 2.02. Furthermore, such Substitute
Mortgage Loan shall otherwise have such characteristics so that the
representations and warranties of the Company set forth in Section 2.03 hereof
would not have been incorrect had such Substitute Mortgage Loan originally been
a Mortgage Loan. A Substitute Mortgage Loan may be substituted for a defective
Mortgage Loan whether or not such defective Mortgage Loan is itself a Substitute
Mortgage Loan.

     The Purchase Price for each repurchased Mortgage Loan shall be deposited by
the Company in the Certificate Account and, upon receipt by the Trustee of
written notification of such deposit signed by a Servicing Officer, the Trustee
shall release to the Company 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 Company or its designee or
assignee title to any Mortgage Loan released pursuant hereto. The obligation of
the Company to repurchase or substitute any Mortgage Loan as to which such a
defect in a constituent document exists shall constitute the sole remedy
respecting such defect available to the Holders of the REMIC I Regular Interests
or the Class R-1 Certificateholders or the Trustee on behalf of the Holders of
the REMIC I Regular Interests or the Class R-1 Certificateholders.

     Section 2.03.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY CONCERNING THE
MORTGAGE LOANS. With respect to the conveyance of the Mortgage Loans provided
for in Section 2.01 herein, the Company hereby represents and warrants to the
Trustee that as of the Cut-Off Date unless otherwise indicated:


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          (i)       The information set forth in the Mortgage Loan Schedule was
     true and correct in all material respects at the date or dates respecting
     which such information is furnished;

          (ii)      As of the Closing Date, other than with respect to
     Cooperative Loans, each Mortgage is a valid and enforceable (subject to
     Section 2.03(xvi)) first lien on an unencumbered estate in fee simple or
     leasehold estate in the related Mortgaged Property subject only to (a)
     liens for current real property taxes and special assessments; (b)
     covenants, conditions and restrictions, rights of way, easements and other
     matters of public record as of the date of recording such Mortgage, such
     exceptions appearing of record being acceptable to mortgage lending
     institutions generally or specifically reflected in the appraisal obtained
     in connection with the origination of the Mortgage Loan; (c) exceptions set
     forth in the title insurance policy relating to such Mortgage, such
     exceptions being acceptable to mortgage lending institutions generally; and
     (d) other matters to which like properties are commonly subject which do
     not materially interfere with the benefits of the security intended to be
     provided by the Mortgage;

          (iii)     As of the Closing Date, the Company had good title to, and
     was the sole owner of, each Mortgage Loan free and clear of any encumbrance
     or lien, and immediately upon the transfer and assignment herein
     contemplated, the Trustee shall have good title to, and will be the sole
     legal owner of, each Mortgage Loan, free and clear of any encumbrance or
     lien (other than any lien under this Agreement);

          (iv)      As of the day prior to the Cut-Off Date, all payments due on
     each Mortgage Loan had been made and no Mortgage Loan had been delinquent
     (i.e., was more than 30 days past due) more than once in the preceding 12
     months and any such delinquency lasted for no more than 30 days;

          (v)       As of the Closing Date, there is no late assessment for
     delinquent taxes outstanding against any Mortgaged Property;

          (vi)      As of the Closing Date, there is no offset, defense or
     counterclaim to any Mortgage Note, including the obligation of the
     Mortgagor to pay the unpaid principal or interest on such Mortgage Note
     except to the extent that the Buydown Agreement for a Buydown Loan forgives
     certain indebtedness of a Mortgagor;

          (vii)     As of the Closing Date, each Mortgaged Property is free of
     damage and in good repair, ordinary wear and tear excepted;

          (viii)    Each Mortgage Loan at the time it was made complied with all
     applicable state and federal laws, including, without limitation, usury,
     equal credit opportunity, disclosure and recording laws;

          (ix)      Each Mortgage Loan was originated by a savings association,
     savings bank, credit union, insurance company, or similar institution which
     is supervised and examined by a federal or state authority or by a
     mortgagee approved by the FHA and will


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<PAGE>

     be serviced by an institution which meets the servicer eligibility
     requirements established by the Company;

          (x)       As of the Closing Date, each Mortgage Loan (except the
     Cooperative Loans) is covered by an ALTA form or CLTA form of mortgagee
     title insurance policy or other form of policy of insurance which, as of
     the origination date of such Mortgage Loan, was acceptable to FNMA or
     FHLMC, and has been issued by, and is the valid and binding obligation of,
     a title insurer which, as of the origination date of such Mortgage Loan,
     was acceptable to FNMA or FHLMC and qualified to do business in the state
     in which the related Mortgaged Property is located. Such policy insures the
     originator of the Mortgage Loan, its successors and assigns as to the first
     priority lien of the Mortgage in the original principal amount of the
     Mortgage Loan subject to the exceptions set forth in such policy. Such
     policy is in full force and effect and will be in full force and effect and
     inure to the benefit of the Holders of the REMIC I Regular Interests and
     the Class R-1 Certificateholders upon the consummation of the transactions
     contemplated by this Agreement and no claims have been made under such
     policy, and no prior holder of the related Mortgage, including the Company,
     has done, by act or omission, anything which would impair the coverage of
     such policy;

          (xi)      Other than with respect to Group I Loans representing 6.1%
     (by Principal Balance) of the Group I Loans, Group II Loans representing
     5.7% (by Principal Balance) of the Group II Loans, Group III Loans
     representing 1.6% (by Principal Balance) of the Group III Loans and Group
     IV Loans representing 25.9% (by Principal Balance) of the Group IV Loans,
     each Mortgage Loan which had a Loan-to-Value Ratio as of the Cut-Off Date
     in excess of 80% was covered by a Primary Insurance Policy or an FHA
     insurance policy or a VA guaranty, and such policy or guaranty is valid and
     remains in full force and effect;

          (xii)     As of the Closing Date, all policies of insurance required
     by this Agreement or by a Selling and Servicing Contract  have been validly
     issued and remain in full force and effect, including such policies
     covering the Company, the Master Servicer or any Servicer;

          (xiii)    As of the Closing Date, each insurer issuing a Primary
     Insurance Policy holds a rating acceptable to the Rating Agencies;

          (xiv)     Each Mortgage was documented by appropriate FNMA/FHLMC
     mortgage instruments in effect at the time of origination, or other
     instruments approved by the Company;

          (xv)      As of the Closing Date, other than with respect to a
     Cooperative Loan, the Mortgaged Property securing each Mortgage is improved
     with a one- to four-family dwelling unit, including units in a duplex,
     condominium project, townhouse, a planned unit development or a de minimis
     planned unit development;


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          (xvi)     As of the Closing Date, each Mortgage and Mortgage Note is
     the legal, valid and binding obligation of the maker thereof and is
     enforceable in accordance with its terms, except only as such enforcement
     may be limited by laws affecting the enforcement of creditors' rights
     generally and principles of equity;

          (xvii)    As of the date of origination, as to Mortgaged Properties
     which are units in condominiums or planned unit developments, all of such
     units met FNMA or FHLMC requirements, are located in a condominium or
     planned unit development projects which have received FNMA or FHLMC
     approval, or are approvable by FNMA or FHLMC;

          (xviii)   None of the Mortgage Loans are Buydown Loans;

          (xix)     Based solely on representations of the Mortgagors obtained
     at the origination of the related Mortgage Loans, approximately 68.76% (by
     Principal Balance) of the Group I Loans will be secured by owner occupied
     Mortgaged Properties which are the primary residences of the related
     Mortgagors, approximately 1.91% (by Principal Balance) of the Group I Loans
     will be secured by owner occupied Mortgaged Properties which were second or
     vacation homes of the Mortgagors and approximately 29.34% (by Principal
     Balance) of the Group I Loans will be secured by Mortgaged Properties which
     were investor properties of the related Mortgagors; approximately 70.51%
     (by Principal Balance) of the Group II Loans will be secured by owner
     occupied Mortgaged Properties which are the primary residences of the
     related Mortgagors, approximately 2.86% (by Principal Balance) of the Group
     II Loans will be secured by owner occupied Mortgaged Properties which were
     second or vacation homes of the Mortgagors and approximately 26.63% (by
     Principal Balance) of the Group II Loans will be secured by Mortgaged
     Properties which were investor properties of the related Mortgagors;
     approximately 97.52% (by Principal Balance) of the Group III Loans will be
     secured by owner occupied Mortgaged Properties which are the primary
     residences of the related Mortgagors, approximately 1.00% (by Principal
     Balance) of the Group III Loans will be secured by owner occupied Mortgaged
     Properties which were second or vacation homes of the Mortgagors and
     approximately 1.47% (by Principal Balance) of the Group III Loans will be
     secured by Mortgaged Properties which were investor properties of the
     related Mortgagors; approximately 83.73% (by Principal Balance) of the
     Group IV Loans will be secured by owner occupied Mortgaged Properties which
     are the primary residences of the related Mortgagors, approximately 3.19%
     (by Principal Balance) of the Group IV Loans will be secured by owner
     occupied Mortgaged Properties which were second or vacation homes of the
     Mortgagors and approximately 13.08% (by Principal Balance) of the Group IV
     Loans will be secured by Mortgaged Properties which were investor
     properties of the related Mortgagors and none of the Group I Loans, Group
     III Loans and Group IV Loans will be secured by interests in Cooperative
     Apartments and one Group II Loan representing 0.13% (by Principal Balance)
     of the Group II Loans will be secured by interests in Cooperative
     Apartments;

          (xx)      Prior to origination or refinancing, an appraisal of each
     Mortgaged Property was made by an appraiser on a form satisfactory to FNMA
     or FHLMC;


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          (xxi)     The Mortgage Loans have been underwritten substantially in
     accordance with the applicable Underwriting Standards;

          (xxii)    All of the Mortgage Loans have due-on-sale clauses; by the
     terms of the Mortgage Notes, however, the due on sale provisions may not be
     exercised at the time of a transfer if prohibited by law;

          (xxiii)   The Company used no adverse selection procedures in
     selecting the Mortgage Loans from among the outstanding fixed-rate
     conventional mortgage loans purchased by it which were available for
     inclusion in the Mortgage Pool and as to which the representations and
     warranties in this Section 2.03 could be made;

          (xxiv)    With respect to a Mortgage Loan that is a Cooperative Loan,
     the Cooperative Stock that is pledged as security for the Mortgage Loan is
     held by a person as a tenant-stockholder (as defined in Section 216 of the
     Code) in a cooperative housing corporation (as defined in Section 216 of
     the Code);

          (xxv)     Each Cooperative Loan is secured by a valid, subsisting and
     enforceable (except as such enforcement may be limited by laws affecting
     the enforcement of creditors' rights generally and principles of equity)
     perfected first lien and security interest in the related Cooperative Stock
     securing the related Mortgage Note, subject only to (a) liens of the
     Cooperative for unpaid assessments representing the Mortgagor's pro rata
     share of the Cooperative's payments for its blanket mortgage, current and
     future real property taxes, insurance premiums, maintenance fees and other
     assessments to which like collateral is commonly subject, and (b) other
     matters to which like collateral is commonly subject which do not
     materially interfere with the benefits of the security intended to be
     provided by the Security Agreement;

          (xxvi)    With respect to any Mortgage Loan as to which an affidavit
     has been delivered to the Trustee certifying that the original Mortgage
     Note is a Destroyed Mortgage Note, if such Mortgage Loan is subsequently in
     default, the enforcement of such Mortgage Loan or of the related Mortgage
     by or on behalf of the Trustee will not be materially adversely affected by
     the absence of the original Mortgage Note;

          (xxvii)   Based upon an appraisal of the Mortgaged Property securing
     each Mortgage Loan, approximately 87.94% (by Principal Balance) of the
     Group I Loans had a current Loan-to-Value Ratio less than or equal to 80%,
     approximately 12.06% (by Principal Balance) of the Group I Loans had a
     current Loan-to-Value Ratio greater than 80% but less than or equal to 95%
     and no Group I Loan had a current Loan-to-Value Ratio greater than 95%;
     approximately 86.63% (by Principal Balance) of the Group II Loans had a
     current Loan-to-Value Ratio less than or equal to 80%, approximately 13.37%
     (by Principal Balance) of the Group II Loans had a current Loan-to-Value
     Ratio greater than 80% but less than or equal to 95% and no Group II Loan
     had a current Loan-to-Value Ratio greater than 95%; approximately 92.76%
     (by Principal Balance) of the Group III Loans had a current Loan-to-Value
     Ratio less than or equal to 80%, approximately 7.24% (by Principal Balance)
     of the Group III Loans had a current Loan-


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     to-Value Ratio greater than 80% but less than or equal to 95% and no Group
     III Loan had a current Loan-to-Value Ratio greater than 95%; approximately
     89.97% (by Principal Balance) of the Group IV Loans had a current
     Loan-to-Value Ratio less than or equal to 80%, approximately 10.03% (by
     Principal Balance) of the Group IV Loans had a current Loan-to-Value Ratio
     greater than 80% but less than or equal to 95% and no Group IV Loan had a
     current Loan-to-Value Ratio greater than 95%;

          (xxviii)  Approximately 53.20% (by Principal Balance) of the Group I
     Loans, approximately 50.12% (by Principal Balance) of the Group II Loans,
     approximately 77.39% (by Principal Balance) of the Group III Loans and
     approximately 56.24% (by Principal Balance) of the Group IV Loans were
     originated for the purpose of refinancing existing mortgage debt, including
     cash-out refinancings and approximately 46.80% (by Principal Balance) of
     the Group I Loans, approximately 49.88% (by Principal Balance) of the Group
     II Loans, approximately 22.61% (by Principal Balance) of the Group III
     Loans and approximately 43.76% (by Principal Balance) of the Group IV Loans
     were originated for the purpose of purchasing the Mortgaged Property;

          (xxix)    Not less than approximately 34.40%, 39.49%, 74.14% and
     29.48% (by Principal Balance) of the Group I Loans, Group II Loans, Group
     III Loans and Group IV Loans, respectively, were originated under full
     documentation programs;

          (xxx)     Each Mortgage Loan constitutes a qualified mortgage under
     Section 860G(a)(3)(A) of the Code and Treasury Regulations Section
     1.860G-2(a)(1).

     It is understood and agreed that the representations and warranties set
forth in this Section 2.03 shall survive delivery of the respective Mortgage
Files to the Trustee or the Custodian, as the case may be, and shall continue
throughout the term of this Agreement. Upon discovery by any of the Company, the
Master Servicer, the Trustee or the Custodian of a breach of any of the
foregoing representations and warranties which materially and adversely affects
the value of the related Mortgage Loans or the interests of the
Certificateholders in the related Mortgage Loans, the Company, the Master
Servicer, the Trustee or the Custodian, as the case may be, discovering such
breach shall give prompt written notice to the others. Within 90 days of its
discovery or its receipt of notice of breach, the Company shall repurchase,
subject to the limitations set forth in the definition of "Purchase Price", or
substitute for the affected Mortgage Loan or Mortgage Loans or any property
acquired in respect thereof from the Trustee, unless it has cured such breach in
all material respects. After the end of the three-month period beginning on the
"start-up day", any such substitution shall be made only if the Company provides
to the Trustee an Opinion of Counsel reasonably satisfactory to the Trustee that
each Substitute Mortgage Loan will be a "qualified replacement mortgage" within
the meaning of Section 860G(a)(4) of the Code. Such substitution shall be made
in the manner and within the time limits set forth in Section 2.02. Any such
repurchase by the Company shall be accomplished in the manner and at the
Purchase Price, if applicable, but shall not be subject to the time limits, set
forth in Section 2.02. It is understood and agreed that the obligation of the
Company to provide such substitution or to make such repurchase of any affected
Mortgage Loan or Mortgage Loans or any property acquired in respect thereof as
to which a breach has occurred and is continuing shall constitute the sole
remedy respecting such breach available to the Holders of the REMIC I Regular
Interests and the


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Class R-1 Certificateholders or the Trustee on behalf of the Holders of the
REMIC I Regular Interests and the Class R-1 Certificateholders.

     Section 2.04.  ACKNOWLEDGMENT OF TRANSFER OF REMIC I TRUST FUND;
AUTHENTICATION OF THE CLASS R-1 CERTIFICATES. The Trustee acknowledges the
transfer and assignment to it of the property constituting the REMIC I Trust
Fund, but without having made the review required to be made within 45 days
pursuant to Section 2.02, and, as of the Closing Date, shall cause to be
authenticated and delivered to or upon the order of the Company, the Class R-1
Certificates in Authorized Denominations evidencing the residual beneficial
ownership interest in the REMIC I Trust Fund.

     Section 2.05.  CONVEYANCE OF REMIC II; REMIC ELECTION AND DESIGNATIONS.  A
trust ("REMIC II") of which the Trustee is the trustee is hereby created under
the laws of the State of New York for the benefit of the Holders of the
Certificates (other than the Class R-1 Certificates).  The purpose of REMIC II
is to hold the REMIC II Trust Fund and provide for the issuance, execution and
delivery of the Certificates (other than the Class R-1 Certificates).  The
assets of REMIC II shall consist of the REMIC II Trust Fund.  REMIC II shall be
irrevocable.

     The assets of REMIC II shall remain in the custody of the Trustee, on
behalf of REMIC II, and shall be kept in REMIC II.  Moneys to the credit of
REMIC II shall be held by the Trustee and invested as provided herein.  All
assets received and held in REMIC II will not be subject to any right, charge,
security interest, lien or claim of any kind in favor of U.S. Bank National
Association in its own right, or any Person claiming through it.  The Trustee,
on behalf of REMIC II, shall not have the power or authority to transfer,
assign, hypothecate, pledge or otherwise dispose of any of the assets of REMIC
II to any Person, except as permitted herein.  No creditor of a beneficiary of
REMIC II, of the Trustee, of the Master Servicer or of the Company shall have
any right to obtain possession of, or otherwise exercise legal or equitable
remedies with respect to, the property of REMIC II, except in accordance with
the terms of this Agreement.

     Concurrently with the execution and delivery hereof, the Company does
hereby agree to irrevocably sell, transfer, assign, set over, and otherwise
convey to the Trustee in trust for the benefit of the Certificateholders (other
than the Class R-1 Certificateholders), without recourse, all the Company's
right, title and interest in and to the REMIC II Trust Fund, including all
interest and principal received by the Company on or with respect to the REMIC I
Regular Interests after the Cut-Off Date. The Trustee hereby accepts REMIC II
created hereby and accepts delivery of the REMIC II Trust Fund on behalf of
REMIC II and acknowledges that it holds the REMIC I Regular Interests for the
benefit of the Holders of the Certificates (other than the Class R-1
Certificates) issued pursuant to this Agreement. It is the express intent of the
parties hereto that the conveyance of the REMIC II Trust Fund to the Trustee by
the Company as provided in this Section 2.05 be, and be construed as, an
absolute sale of the REMIC II Trust Fund. It is, further, not the intention of
the parties that such conveyance be deemed a pledge of the REMIC II Trust Fund
by the Company to the Trustee to secure a debt or other obligation of the
Company. However, in the event that, notwithstanding the intent of the parties,
the REMIC II Trust Fund is held to be the property of the Company, or if for any
other reason this Agreement is held or deemed to create a security interest in
the REMIC II Trust Fund, then


                                         102
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     (a)  this Agreement shall be deemed to be a security agreement;

     (b)  the conveyance provided for in this Section 2.05 shall be deemed to be
a grant by the Company to the Trustee of a security interest in all of the
Company's right, title, and interest, whether now owned or hereafter acquired,
in and to:

          (I)       All accounts, contract rights, general intangibles, chattel
     paper, instruments, documents, money, deposit accounts, certificates of
     deposit, goods, letters of credit, advices of credit and investment
     property consisting of, arising from or relating to any of the property
     described below: The uncertificated REMIC I Regular Interests, including
     without limitation all rights represented thereby in and to (i) the
     Mortgage Loans identified on the Mortgage Loan Schedule, including the
     related Mortgage Notes, Mortgages, Cooperative Stock Certificates, and
     Cooperative Leases, all Substitute Mortgage Loans and all distributions
     with respect to such Mortgage Loans and Substitute Mortgage Loans payable
     on and after the Cut-Off Date, (ii) the Certificate Account, and, to the
     extent relating to the Mortgage Loans, the Investment Account, the
     Custodial Accounts for P&I, the Custodial Accounts for Reserves and all
     money or other property held therein as relating to the Mortgage Loans;
     (iii) amounts paid or payable by the insurer under any FHA insurance policy
     or any Primary Insurance Policy and proceeds of any VA guaranty and any
     other insurance policy related to any Mortgage Loan or the Mortgage Pool;
     (iv) all property or rights arising from or by virtue of the disposition
     of, or collections with respect to, or insurance proceeds payable with
     respect to, or claims against other persons with respect to, all or any
     part of the collateral described in (i)-(iii) above (including any accrued
     discount realized on liquidation of any investment purchased at a
     discount), and (v) all cash and non-cash proceeds of the collateral
     described in (i)-(iv) above;

          (II)      All accounts, general intangibles, chattel paper,
     instruments, documents, money, deposit accounts, certificates of deposit,
     goods, letters of credit, advices of credit, investment property and other
     rights arising from or by virtue of the disposition of, or collections with
     respect to, or insurance proceeds payable with respect to, or claims
     against other persons with respect to, all or any part of the collateral
     described in (I) above (including any accrued discount realized on
     liquidation of any investment purchased at a discount); and

          (III)     All cash and non-cash proceeds of the collateral described
     in (I) and (II) above;

     (c)  the possession by the Trustee of the Mortgage Notes, the Mortgages and
such other goods, letters of credit, advices of credit, instruments, money,
documents, chattel paper or certificated securities shall be deemed to be
possession by the secured party or possession by a purchaser for purposes of
perfecting the security interest pursuant to the Uniform Commercial Code
(including, without limitation, Sections 9-305 and 9-115 thereof) as in force in
the relevant jurisdiction; and


                                         103
<PAGE>

     (d)  notifications to persons holding such property, and acknowledgments,
receipts or confirmations from persons holding such property, shall be deemed
notifications to, or acknowledgments, receipts or confirmations from, securities
intermediaries, bailees or agents of, or persons holding for, the Trustee, as
applicable for the purpose of perfecting such security interest under applicable
law.

     The Company and the Trustee shall, to the extent consistent with this
Agreement, take such actions as may be necessary to ensure that, if this
Agreement were deemed to create a security interest in the REMIC II Trust Fund,
such security interest would be deemed to be a perfected security interest of
first priority under applicable law and will be maintained as such throughout
the term of this Agreement. In connection herewith, the Trustee shall have all
of the rights and remedies of a secured party and creditor under the Uniform
Commercial Code as in force in the relevant jurisdiction.

     The Trustee is authorized, with the Master Servicer's consent, to appoint
any bank or trust company approved by and unaffiliated with each of the Company
and the Master Servicer as Custodian of the documents or instruments referred to
above in this Section 2.05, and to enter into a Custodial Agreement for such
purpose; provided, however, that the Trustee shall be and remain liable for
actions of any such Custodian only to the extent it would otherwise be
responsible for such acts hereunder.

     The Company and the Trustee agree that the Company, on behalf of the REMIC
II Trust Fund, shall elect to treat the REMIC II Trust Fund as a REMIC within
the meaning of Section 860D of the Code and, if necessary, under applicable
state laws. Such election shall be included in the Form 1066 and any appropriate
state return to be filed on behalf of the REMIC constituted by the REMIC II
Trust Fund for its first taxable year.

     The Closing Date is hereby designated as the "startup day" of the REMIC
constituted by the REMIC II Trust Fund within the meaning of Section 860G(a)(9)
of the Code.

     The regular interests (as set forth in the table contained in the
Preliminary Statement hereto) relating to the REMIC II Trust Fund are hereby
designated as "regular interests" for purposes of Section 860G(a)(1) of the
Code. The Class R-2 Certificates are being issued in a single Class, which is
hereby designated as the sole class of "residual interest" in the REMIC II Trust
Fund for purposes of Section 860G(a)(2) of the Code.

     The parties intend that the affairs of the REMIC II Trust Fund formed
hereunder shall constitute, and that the affairs of the REMIC II Trust Fund
shall be conducted so as to qualify it as, a REMIC. In furtherance of such
intention, the Company covenants and agrees that it shall act as agent for the
Tax Matters Person (and the Company is hereby appointed to act as Tax Matters
Person) on behalf of the REMIC II Trust Fund and that in such capacity it shall:
(a) prepare and file, or cause to be prepared and filed, a federal tax return
using a calendar year as the taxable year for the REMIC II Trust Fund when and
as required by the REMIC provisions and other applicable federal income tax
laws; (b) make an election, on behalf of the REMIC II Trust Fund, to be treated
as a REMIC on the federal tax return of the REMIC II Trust Fund for its first
taxable year, in accordance with the REMIC provisions; (c) prepare and forward,
or cause to be


                                         104
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prepared and forwarded, to the Certificateholders (other than the Class R-1
Certificateholders) all information reports as and when required to be provided
to them in accordance with the REMIC provisions; (d) conduct the affairs of the
REMIC II Trust Fund at all times that any Certificates are outstanding so as to
maintain the status of the REMIC II Trust Fund as a REMIC under the REMIC
provisions; (e) not knowingly or intentionally take any action or omit to take
any action that would cause the termination of the REMIC status of the REMIC II
Trust Fund; and (f) pay the amount of any federal prohibited transaction penalty
taxes imposed on the REMIC II Trust Fund when and as the same shall be due and
payable (but such obligation shall not prevent the Company or any other
appropriate person from contesting any such tax in appropriate proceedings and
shall not prevent the Company from withholding payment of such tax, if permitted
by law, pending the outcome of such proceedings); provided, that the Company
shall be entitled to be indemnified from the REMIC II Trust Fund for any such
prohibited transaction penalty taxes if the Company's failure to exercise
reasonable care was not the primary cause of the imposition of such prohibited
transaction penalty taxes.

     In the event that any tax is imposed on "prohibited transactions" of the
REMIC II Trust Fund as defined in Section 860F of the Code and not paid by the
Company pursuant to clause (f) of the preceding paragraph, such tax shall be
charged against amounts otherwise distributable to the Holders of the Class R-2
Certificates. Notwithstanding anything to the contrary contained herein, the
Company is hereby authorized to retain from amounts otherwise distributable to
the Holders of the Class R-2 Certificates on any Distribution Date sufficient
funds to reimburse the Company for the payment of such tax (to the extent that
the Company has not been previously reimbursed therefor).

     Section 2.06.  ACCEPTANCE BY TRUSTEE; AUTHENTICATION OF CERTIFICATES. The
Trustee acknowledges and accepts the assignment to it of the property
constituting the REMIC II Trust Fund and declares that as of the Closing Date it
holds and shall hold any documents constituting a part of the REMIC II Trust
Fund, and the REMIC II Trust Fund, as Trustee in trust, upon the trusts herein
set forth, for the use and benefit of all present and future Certificateholders
(other than the Class R-1 Certificateholders).  In connection therewith, as of
the Closing Date, the Trustee shall cause to be authenticated and delivered to
or upon the order of the Company, in exchange for the property constituting the
REMIC II Trust Fund, the Certificates (other than the Class R-1 Certificates) in
Authorized Denominations evidencing the entire ownership of the REMIC II Trust
Fund.


                                   ARTICLE III


                  ADMINISTRATION AND SERVICING OF MORTGAGE LOANS

     Section 3.01.  THE COMPANY TO ACT AS MASTER SERVICER.  The Company shall
act as Master Servicer to service and administer the Mortgage Loans on behalf of
the Trustee and for the benefit of the Certificateholders in accordance with the
terms hereof and in the same manner in which, and with the same care, skill,
prudence and diligence with which, it services and administers similar mortgage
loans for other portfolios, and shall have full power and authority to


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do or cause to be done any and all things in connection with such servicing and
administration which it may deem necessary or desirable, including, without
limitation, the power and authority to bring actions and defend REMIC I and
REMIC II on behalf of the Trustee in order to enforce the terms of the Mortgage
Notes.  The Master Servicer may perform its master servicing responsibilities
through agents or independent contractors, but shall not thereby be released
from any of its responsibilities hereunder and the Master Servicer shall
diligently pursue all of its rights against such agents or independent
contractors.

     The Master Servicer shall make reasonable efforts to collect or cause to be
collected all payments called for under the terms and provisions of the Mortgage
Loans and shall, to the extent such procedures shall be consistent with this
Agreement and the terms and provisions of any Primary Insurance Policy, any FHA
insurance policy or VA guaranty, any hazard insurance policy, and federal flood
insurance, cause to be followed such collection procedures as are followed with
respect to mortgage loans comparable to the Mortgage Loans and held in
portfolios of responsible mortgage lenders in the local areas where each
Mortgaged Property is located. The Master Servicer shall enforce "due-on-sale"
clauses with respect to the related Mortgage Loans, to the extent permitted by
law, subject to the provisions set forth in Section 3.08.

     Consistent with the foregoing, the Master Servicer may in its discretion
(i) waive or cause to be waived any assumption fee or late payment charge in
connection with the prepayment of any Mortgage Loan and (ii) only upon
determining that the coverage of any applicable insurance policy or guaranty
related to a Mortgage Loan will not be materially adversely affected, arrange a
schedule, running for no more than 180 days after the first delinquent Due Date,
for payment of any delinquent installment on any Mortgage Note or for the
liquidation of delinquent items. The Master Servicer shall have the right, but
not the obligation, to repurchase any related delinquent Mortgage Loan 90 days
after the first delinquent Due Date for an amount equal to its Purchase Price;
provided, however, that the aggregate Purchase Price of Mortgage Loans so
repurchased shall not exceed one-half of one percent (0.50%) of the aggregate
Principal Balance, as of the Cut-Off Date, of all Mortgage Loans.

     The Master Servicer is hereby authorized and empowered by the Trustee to
execute and deliver or cause to be executed and delivered on behalf of the
Holders of the REMIC I Regular Interests and the Class R-1 Certificateholders,
and the Trustee or any of them, any and all instruments of satisfaction or
cancellation, or of partial or full release, discharge or modification,
assignments of Mortgages and endorsements of Mortgage Notes in connection with
refinancings (in jurisdictions where such assignments are the customary and
usual standard of practice of mortgage lenders) and all other comparable
instruments, with respect to the Mortgage Loans and with respect to the
Mortgaged Properties. The Trustee shall furnish the Master Servicer, at the
Master Servicer's direction, with any powers of attorney and other documents
necessary or appropriate to enable the Master Servicer to carry out its
supervisory, servicing and administrative duties under this Agreement.

     The Master Servicer and each Servicer shall obtain (to the extent generally
commercially available from time to time) and maintain fidelity bond and errors
and omissions coverage acceptable to FNMA or FHLMC with respect to their
obligations under this Agreement and the applicable Selling and Servicing
Contract, respectively. The Master Servicer or each Servicer, as


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applicable, shall establish escrow accounts for, or pay when due (by means of an
advance), any tax liens in connection with the Mortgaged Properties that are not
paid by the Mortgagors when due to the extent that any such payment would not
constitute a Nonrecoverable Advance when made. Notwithstanding the foregoing,
the Master Servicer shall not permit any modification with respect to any
Mortgage Loan that would both constitute a sale or exchange of such Mortgage
Loan within the meaning of Section 1001 of the Code (including any proposed,
temporary or final regulations promulgated thereunder) (other than in connection
with a proposed conveyance or assumption of such Mortgage Loan that is treated
as a Principal Prepayment or in a default situation) and cause any of the REMICs
to fail to qualify as such under the Code. The Master Servicer shall be entitled
to approve a request from a Mortgagor for a partial release of the related
Mortgaged Property, the granting of an easement thereon in favor of another
Person, any alteration or demolition of the related Mortgaged Property or other
similar matters if it has determined, exercising its good faith business
judgment in the same manner as it would if it were the owner of the related
Mortgage Loan, that the security for, and the timely and full collectability of,
such Mortgage Loan would not be adversely affected thereby and that the
applicable trust fund would not fail to continue to qualify as a REMIC under the
Code as a result thereof and that no tax on "prohibited transactions" or
"contributions" after the startup day would be imposed on either REMIC as a
result thereof.

     In connection with the servicing and administering of each Mortgage Loan,
the Master Servicer and any affiliate of the Master Servicer (i) may perform
services such as appraisals, default management and brokerage services that are
not customarily provided by servicers of mortgage loans, and shall be entitled
to reasonable compensation therefor and (ii) may, at its own discretion and on
behalf of the Trustee, obtain credit information in the form of a "credit score"
from a credit repository.

     Section 3.02.  CUSTODIAL ACCOUNTS. The Master Servicer shall cause to be
established and maintained by each Servicer under the Master Servicer's
supervision the Custodial Account for P&I, Buydown Fund Accounts (if any) and
special Custodial Account for Reserves and shall deposit or cause to be
deposited therein daily the amounts related to the Mortgage Loans required by
the Selling and Servicing Contracts to be so deposited. Proceeds received with
respect to individual Mortgage Loans from any title, hazard, or FHA insurance
policy, VA guaranty, Primary Insurance Policy, or other insurance policy
covering such Mortgage Loans shall be deposited first in the Custodial Account
for Reserves if required for the restoration or repair of the related Mortgaged
Property. Proceeds from such insurance policies not so deposited in the
Custodial Account for Reserves shall be deposited in the Custodial Account for
P&I, and shall be applied to the balances of the related Mortgage Loans as
payments of interest and principal.

     The Master Servicer is hereby authorized to make withdrawals from and to
issue drafts against the Custodial Accounts for P&I and the Custodial Accounts
for Reserves for the purposes required or permitted by this Agreement. Each
Custodial Account for P&I and each Custodial Account for Reserves shall bear a
designation clearly showing the respective interests of the applicable Servicer,
as trustee, and of the Master Servicer, in substantially one of the following
forms:


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          (a)       With respect to the Custodial Account for P&I: (i)
     [Servicer's Name], as agent, trustee and/or bailee of principal and
     interest custodial account for PNC Mortgage Securities Corp., its
     successors and assigns, for various owners of interests in PNC Mortgage
     Securities Corp. mortgage-backed pools or (ii) [Servicer's Name] in trust
     for PNC Mortgage Securities Corp.;

          (b)       With respect to the Custodial Account for Reserves: (i)
     [Servicer's Name], as agent, trustee and/or bailee of taxes and insurance
     custodial account for PNC Mortgage Securities Corp., its successors and
     assigns for various mortgagors and/or various owners of interests in PNC
     Mortgage Securities Corp. mortgage-backed pools or (ii) [Servicer's Name]
     in trust for PNC Mortgage Securities Corp. and various Mortgagors.

     The Master Servicer hereby undertakes to assure remittance to the
Certificate Account of all amounts relating to the Mortgage Loans that have been
collected by any Servicer and are due to the Certificate Account pursuant to
Section 4.01 of this Agreement.

     Section 3.03.    THE INVESTMENT ACCOUNT; ELIGIBLE INVESTMENTS.(a)  Not 
later than the Withdrawal Date, the Master Servicer shall withdraw or direct 
the withdrawal of funds in the Custodial Accounts for P&I, for deposit in the 
Investment Account, in an amount representing:

          (i)       Scheduled installments of principal and interest on the
     Mortgage Loans received or advanced by the applicable Servicers which were
     due on the Due Date prior to such Withdrawal Date, net of Servicing Fees
     due the applicable Servicers and less any amounts to be withdrawn later by
     the applicable Servicers from the applicable Buydown Fund Accounts;

          (ii)      Payoffs and the proceeds of other types of liquidations of
     the Mortgage Loans received by the applicable Servicer for such Mortgage
     Loans during the applicable Payoff Period, with interest to the date of
     Payoff or liquidation less any amounts to be withdrawn later by the
     applicable Servicers from the applicable Buydown Fund Accounts; and

          (iii)     Curtailments received by the applicable Servicers in the
     Prior Period.

     At its option, the Master Servicer may invest funds withdrawn from the
Custodial Accounts for P&I, as well as any Buydown Funds, Insurance Proceeds and
Liquidation Proceeds previously received by the Master Servicer (including
amounts paid by the Company in respect of any Purchase Obligation or its
substitution obligations set forth in Section 2.02 or Section 2.03 or in
connection with the exercise of the option to terminate this Agreement pursuant
to Section 9.01) for its own account and at its own risk, during any period
prior to their deposit in the Certificate Account. Such funds, as well as any
funds which were withdrawn from the Custodial Accounts for P&I on or before the
Withdrawal Date, but not yet deposited into the Certificate Account, shall
immediately be deposited by the Master Servicer with the Investment Depository
in an Investment Account in the name of the Master Servicer and the Trustee for
investment only as set forth in this Section 3.03. The Master Servicer shall
bear any and all losses incurred on any investments made with such funds and
shall be entitled to retain all gains realized on such


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investments as additional servicing compensation. Not later than the Business
Day prior to the Distribution Date, the Master Servicer shall deposit such
funds, net of any gains (except Payoff Earnings) earned thereon, in the
Certificate Account.

     (b)  Funds held in the Investment Account shall be invested in (i) one or
more Eligible Investments which shall in no event mature later than the Business
Day prior to the related Distribution Date (except if such Eligible Investments
are obligations of the Trustee, such Eligible Investments may mature on the
Distribution Date), or (ii) such other instruments as shall be required to
maintain the Ratings.

     Section 3.04.  THE CERTIFICATE ACCOUNT.

     (a)  Not later than the Business Day prior to the related Distribution
Date, the Master Servicer shall direct the Investment Depository to deposit the
amounts previously deposited into the Investment Account (which may include a
deposit of Eligible Investments) to which the Holders of the REMIC I Regular
Interests and Class R-1 Certificateholders are entitled into the Certificate
Account. In addition, not later than the Business Day prior to the Distribution
Date, the Master Servicer shall deposit into the Certificate Account any Monthly
P&I Advances or other payments required to be made by the Master Servicer
pursuant to Section 4.02 of this Agreement and any Insurance Proceeds or
Liquidation Proceeds (including amounts paid by the Company in respect of any
Purchase Obligation or in connection with the exercise of its option to
terminate this Agreement pursuant to Section 9.01) not previously deposited in
the Custodial Accounts for P&I or the Investment Account.

     (b)  Funds held in the Certificate Account shall be invested at the
direction of the Master Servicer in (i) one or more Eligible Investments which
shall in no event mature later than the Business Day prior to the related
Distribution Date (except if such Eligible Investments are obligations of the
Trustee, such Eligible Investments may mature on the Distribution Date), or (ii)
such other instruments as shall be required to maintain the Ratings.  The Master
Servicer shall be entitled to receive any gains earned on such Eligible
Investments and shall bear any losses suffered in connection therewith.

     Section 3.05.  PERMITTED WITHDRAWALS FROM THE CERTIFICATE ACCOUNT, THE
INVESTMENT ACCOUNT AND CUSTODIAL ACCOUNTS FOR P&I AND OF BUYDOWN FUNDS FROM THE
BUYDOWN FUND ACCOUNTS.

     (a)  The Master Servicer is authorized to make withdrawals, from time to
time, from the Investment Account, the Certificate Account or the Custodial
Accounts for P&I established by the Servicers of amounts deposited therein in
respect of the Certificates, as follows:

          (i)       To reimburse itself or the applicable Servicer for Monthly
     P&I Advances made pursuant to Section 4.02 or a Selling and Servicing
     Contract, such right to reimbursement pursuant to this paragraph (i) being
     limited to amounts received on particular Mortgage Loans (including, for
     this purpose, Insurance Proceeds and Liquidation Proceeds) which represent
     late recoveries of principal and/or interest respecting which any such
     Monthly P&I Advance was made;


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<PAGE>

          (ii)      To reimburse itself or the applicable Servicer for amounts
     expended by or for the account of the Master Servicer pursuant to Section
     3.09 or amounts expended by such Servicer pursuant to the Selling and
     Servicing Contracts in connection with the restoration of property damaged
     by an Uninsured Cause or in connection with the liquidation of a Mortgage
     Loan;

          (iii)     To pay to itself, with respect to the related Mortgage
     Loans, the Master Servicing Fee (net of Compensating Interest reduced by
     Payoff Earnings and Payoff Interest) as to which no prior withdrawals from
     funds deposited by the Master Servicer have been made;

          (iv)      To reimburse itself or the applicable Servicer for advances
     made with respect to related Mortgage Loans which the Master Servicer has
     determined to be Nonrecoverable Advances;

          (v)       To pay to itself reinvestment earnings deposited or earned
     in the Investment Account and the Certificate Account to which it is
     entitled and to reimburse itself for expenses incurred by and reimbursable
     to it pursuant to Section 6.03;

          (vi)      To deposit to the Investment Account amounts in the
     Certificate Account not required to be on deposit therein at the time of
     such withdrawal;

          (vi)      To deposit in the Certificate Account, not later than the
     Business Day prior to the related Distribution Date, the amounts specified
     in Section 3.04(a); and

     after making or providing for the above withdrawals

          (vii)     To clear and terminate the Investment Account and the
     Certificate Account following termination of this Agreement pursuant to
     Section 9.01.

     Since, in connection with withdrawals pursuant to paragraphs (i) and (ii),
the Master Servicer's entitlement thereto is limited to collections or other
recoveries on the related Mortgage Loan, the Master Servicer or the applicable
Servicer shall keep and maintain separate accounting for each Mortgage Loan, for
the purpose of justifying any such withdrawals.

     (b)  The Master Servicer (or the applicable Servicer, if such Servicer
holds and maintains a Buydown Fund Account) is authorized to make withdrawals,
from time to time, from the Buydown Fund Account or Custodial Account for P&I
established by any Servicer under its supervision of the following amounts of
Buydown Funds:

          (i)       To deposit each month in the Investment Account the amount
     necessary to supplement payments received on Buydown Loans;

          (ii)      In the event of a Payoff of any Mortgage Loan having a
     related Buydown Fund, to apply amounts remaining in Buydown Fund Accounts
     to reduce the required amount of such principal Payoff (or, if the
     Mortgagor has made a Payoff, to refund such remaining Buydown Fund amounts
     to the Person entitled thereto);


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          (iii)     In the event of foreclosure or liquidation of any Mortgage
     Loan having a Buydown Fund, to deposit remaining Buydown Fund amounts in
     the Investment Account as Liquidation Proceeds; and

          (iv)      To clear and terminate the portion of any account
     representing Buydown Funds following termination of this Agreement pursuant
     to Section 9.01;

      (c) The Trustee is authorized to make withdrawals from time to time from
the Certificate Account to reimburse itself for advances it has made pursuant to
Section 7.01(a) hereof that it has determined to be Nonrecoverable Advances.

     Section 3.06.  MAINTENANCE OF PRIMARY INSURANCE POLICIES; COLLECTIONS
THEREUNDER. The Master Servicer shall use its best reasonable efforts to keep,
and to cause the Servicers to keep, in full force and effect each Primary
Insurance Policy required with respect to a Mortgage Loan, in the manner set
forth in the applicable Selling and Servicing Contract, until no longer
required. Notwithstanding the foregoing, the Master Servicer shall have no
obligation to maintain such Primary Insurance Policy for a Mortgage Loan for
which the outstanding Principal Balance thereof at any time subsequent to
origination was 80% or less of the value of the related Mortgaged Property (as
determined by the appraisal obtained at the time of origination), unless
required by applicable law.

     Unless required by applicable law, the Master Servicer shall not cancel or
refuse to renew, or allow any Servicer under its supervision to cancel or refuse
to renew, any such Primary Insurance Policy in effect at the date of the initial
issuance of the Certificates that is required to be kept in force hereunder;
provided, however, that neither the Master Servicer nor any Servicer shall
advance funds for the payment of any premium due under any Primary Insurance
Policy if it shall determine that such an advance would be a Nonrecoverable
Advance.

     Section 3.07.  MAINTENANCE OF HAZARD INSURANCE. The Master Servicer shall
cause to be maintained for each Mortgage Loan (other than a Cooperative Loan)
fire insurance with extended coverage in an amount which is not less than the
original principal balance of such Mortgage Loan, except in cases approved by
the Master Servicer in which such amount exceeds the value of the improvements
to the Mortgaged Property. The Master Servicer shall also require fire insurance
with extended coverage in a comparable amount on property acquired upon
foreclosure, or deed in lieu of foreclosure, of any Mortgage Loan (other than a
Cooperative Loan). Any amounts collected under any such policies (other than
amounts to be applied to the restoration or repair of the related Mortgaged
Property) shall be deposited into the Custodial Account for P&I, subject to
withdrawal pursuant to the applicable Selling and Servicing Contract and
pursuant to Section 3.03 and Section 3.05. Any unreimbursed costs incurred in
maintaining any insurance described in this Section 3.07 shall be recoverable as
an advance by the Master Servicer from the Investment Account or the Certificate
Account. Such insurance shall be with insurers approved by the Master Servicer
and FNMA or FHLMC. Other additional insurance may be required of a Mortgagor, in
addition to that required pursuant to such applicable laws and regulations as
shall at any time be in force and as shall require such additional insurance.
Where any part of any improvement to the Mortgaged Property (other than a
Mortgaged Property secured by a Cooperative Loan) is located in a federally
designated special flood hazard area and


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in a community which participates in the National Flood Insurance Program at the
time of origination of the related Mortgage Loan, the Master Servicer shall
cause flood insurance to be provided. The hazard insurance coverage required by
this Section 3.07 may be met with blanket policies providing protection
equivalent to individual policies otherwise required. The Master Servicer or the
applicable Servicer shall be responsible for paying any deductible amount on any
such blanket policy. The Master Servicer agrees to present, or cause to be
presented, on behalf of and for the benefit of the Trustee and
Certificateholders, claims under the hazard insurance policy respecting any
Mortgage Loan, and in this regard to take such reasonable actions as shall be
necessary to permit recovery under such policy.

     Section 3.08.  ENFORCEMENT OF DUE-ON-SALE CLAUSES; ASSUMPTION AGREEMENTS.
When any Mortgaged Property is about to be conveyed by the Mortgagor, the Master
Servicer shall, to the extent it has knowledge of such prospective conveyance
and prior to the time of the consummation of such conveyance, exercise on behalf
of the Trustee the Trustee's rights to accelerate the maturity of such Mortgage
Loan, to the extent that such acceleration is permitted by the terms of the
related Mortgage Note, under any "due-on-sale" clause applicable thereto;
provided, however, that the Master Servicer shall not exercise any such right if
the due-on-sale clause, in the reasonable belief of the Master Servicer, is not
enforceable under applicable law or if such exercise would result in
non-coverage of any resulting loss that would otherwise be covered under any
insurance policy. In the event the Master Servicer is prohibited from exercising
such right, the Master Servicer is authorized to take or enter into an
assumption and modification agreement from or with the Person to whom a
Mortgaged Property has been or is about to be conveyed, pursuant to which such
Person becomes liable under the Mortgage Note and, unless prohibited by
applicable state law or unless the Mortgage Note contains a provision allowing a
qualified borrower to assume the Mortgage Note, the Mortgagor remains liable
thereon; provided that the Mortgage Loan shall continue to be covered (if so
covered before the Master Servicer enters such agreement) by any related Primary
Insurance Policy. The Master Servicer is also authorized to enter into a
substitution of liability agreement with such Person, pursuant to which the
original Mortgagor is released from liability and such Person is substituted as
Mortgagor and becomes liable under the Mortgage Note.  The Master Servicer shall
not enter into any substitution or assumption with respect to a Mortgage Loan if
such substitution or assumption shall (i) both constitute a "significant
modification" effecting an exchange or reissuance of such Mortgage Loan under
the Code (or Treasury regulations promulgated thereunder) and cause the REMIC to
fail to qualify as a REMIC under the REMIC Provisions or (ii) cause the
imposition of any tax on "prohibited transactions" or "contributions" after the
startup day under the REMIC Provisions.  The Master Servicer shall notify the
Trustee that any such substitution or assumption agreement has been completed by
forwarding to the Trustee the original copy of such substitution or assumption
agreement and other documents and instruments constituting a part thereof. In
connection with any such assumption or substitution agreement, the terms of the
related Mortgage Note shall not be changed. Any fee collected by the applicable
Servicer for entering into an assumption or substitution of liability agreement
shall be retained by such Servicer as additional servicing compensation.

     Notwithstanding the foregoing paragraph or any other provision of this
Agreement, the Master Servicer shall not be deemed to be in default, breach or
any other violation of its obligations hereunder by reason of any assumption of
a Mortgage Loan by operation of law or


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any assumption which the Master Servicer may be restricted by law from
preventing, for any reason whatsoever.

     Section 3.09.  REALIZATION UPON DEFAULTED MORTGAGE LOANS. The Master
Servicer shall foreclose upon or otherwise comparably convert, or cause to be
foreclosed upon or comparably converted, the ownership of any Mortgaged Property
securing a Mortgage Loan which comes into and continues in default and as to
which no satisfactory arrangements can be made for collection of delinquent
payments pursuant to Section 3.01. In lieu of such foreclosure or other
conversion, and taking into consideration the desirability of maximizing net
Liquidation Proceeds after taking into account the effect of Insurance Proceeds
upon Liquidation Proceeds, the Master Servicer may, to the extent consistent
with prudent mortgage loan servicing practices, accept a payment of less than
the outstanding Principal Balance of a delinquent Mortgage Loan in full
satisfaction of the indebtedness evidenced by the related Mortgage Note and
release the lien of the related Mortgage upon receipt of such payment. The
Master Servicer shall not foreclose upon or otherwise comparably convert a
Mortgaged Property if the Master Servicer is aware of evidence of toxic waste,
other hazardous substances or other evidence of environmental contamination
thereon and the Master Servicer determines that it would be imprudent to do so.
In connection with such foreclosure or other conversion, the Master Servicer
shall cause to be followed such practices and procedures as it shall deem
necessary or advisable and as shall be normal and usual in general mortgage
servicing activities. The foregoing is subject to the provision that, in the
case of damage to a Mortgaged Property from an Uninsured Cause, the Master
Servicer shall not be required to advance its own funds towards the restoration
of the property unless it shall be determined in the sole judgment of the Master
Servicer, (i) that such restoration will increase the proceeds of liquidation of
the Mortgage Loan to Certificateholders after reimbursement to itself for such
expenses, and (ii) that such expenses will be recoverable to it through
Liquidation Proceeds. The Master Servicer shall be responsible for all other
costs and expenses incurred by it in any such proceedings; provided, however,
that it shall be entitled to reimbursement thereof (as well as its normal
servicing compensation) as an advance. The Master Servicer shall maintain
information required for tax reporting purposes regarding any Mortgaged Property
which is abandoned or which has been foreclosed or otherwise comparably
converted. The Master Servicer shall report such information to the Internal
Revenue Service and the Mortgagor in the manner required by applicable law.

     REMIC I shall not acquire any real property (or personal property incident
to such real property) except in connection with a default or imminent default
of a Mortgage Loan. In the event that REMIC I acquires any real property (or
personal property incident to such real property) in connection with a default
or imminent default of a Mortgage Loan, such property shall be disposed of by
the Master Servicer within two years after its acquisition by the Master
Servicer for REMIC I, unless the Master Servicer provides to the Trustee an
Opinion of Counsel to the effect that the holding by REMIC I of such Mortgaged
Property subsequent to two years after its acquisition will not result in the
imposition of taxes on "prohibited transactions" of REMIC I as defined in
Section 860F of the Code or under the law of any state in which real property
securing a Mortgage Loan owned by REMIC I is located or cause REMIC I to fail to
qualify as a REMIC for federal income tax purposes or for state tax purposes
under the laws of any state in which real property securing a Mortgage Loan
owned by REMIC I is located at any time that any Certificates are outstanding.
The Master Servicer shall manage, conserve, protect


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and operate each such property for the Certificateholders solely for the purpose
of its prompt disposition and sale in a manner which does not cause such
property to fail to qualify as "foreclosure property" within the meaning of
Section 860G(a)(8) or result in the receipt by the REMIC of any "income from
non-permitted assets" within the meaning of Section 860F(a)(2)(B) of the Code or
any "net income from foreclosure property" which is subject to taxation under
the REMIC Provisions. Pursuant to its efforts to sell such property, the Master
Servicer shall either itself or through an agent selected by the Master Servicer
protect and conserve such property in the same manner and to such extent as is
customary in the locality where such property is located and may, incident to
its conservation and protection of the interests of the Certificateholders, rent
the same, or any part thereof, as the Master Servicer deems to be in the best
interest of the Master Servicer and the Certificateholders for the period prior
to the sale of such property. Additionally, the Master Servicer shall perform
the tax withholding and shall file information returns with respect to the
receipt of mortgage interests received in a trade or business, the reports of
foreclosures and abandonments of any Mortgaged Property and the information
returns relating to cancellation of indebtedness income with respect to any
Mortgaged Property required by Sections 6050H, 6050J and 6050P, respectively, of
the Code, and deliver to the Trustee an Officers' Certificate on or before March
31 of each year stating that such reports have been filed.  Such reports shall
be in form and substance sufficient to meet the reporting requirements imposed
by Sections 6050H, 6050J and 6050P of the Code.

     Notwithstanding any other provision of this Agreement, the Master Servicer
shall comply with all federal withholding requirements with respect to payments
to Certificateholders of interest or original issue discount that the Master
Servicer reasonably believes are applicable under the Code.  The consent of
Certificateholders shall not be required for any such withholding.  Without
limiting the foregoing, the Master Servicer agrees that it will not withhold
with respect to payments of interest or original issue discount in the case of a
Certificateholder that has furnished or caused to be furnished an effective Form
W-8 or an acceptable substitute form or a successor form and who is not a "10
percent shareholder" within the meaning of Code Section 871(h)(3)(B) or a
"controlled foreign corporation" described in Code Section 881(c)(3)(C) with
respect to REMIC I, REMIC II or the  Depositor.  In the event the Trustee
withholds any amount from interest or original issue discount payments or
advances thereof to any Certificateholder pursuant to federal withholding
requirements, the Trustee shall indicate the amount withheld to such
Certificateholder.

     Section 3.10.  TRUSTEE TO COOPERATE; RELEASE OF MORTGAGE FILES. Upon the
Payoff or scheduled maturity of any Mortgage Loan, the Master Servicer shall
cause such final payment to be immediately deposited in the related Custodial
Account for P&I or the Investment Account. Upon notice thereof, the Master
Servicer shall promptly notify the Trustee by a certification (which
certification shall include a statement to the effect that all amounts received
in connection with such payment which are required to be deposited in either
such account have been so deposited) of a Servicing Officer and shall request
delivery to it of the Mortgage File. Upon receipt of such certification and
request, the Trustee shall, not later than the fifth succeeding Business Day,
release the related Mortgage File to the Master Servicer or the applicable
Servicer indicated in such request. With any such Payoff or other final payment,
the Master Servicer is authorized to prepare for and procure from the trustee or
mortgagee under the Mortgage which secured the Mortgage Note a deed of full
reconveyance or other form of satisfaction or


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assignment of Mortgage and endorsement of Mortgage Note in connection with a
refinancing covering the Mortgaged Property, which satisfaction, endorsed
Mortgage Note or assigning document shall be delivered by the Master Servicer to
the person or persons entitled thereto. No expenses incurred in connection with
such satisfaction or assignment shall be payable to the Master Servicer by the
Trustee or from the Certificate Account, the related Investment Account or the
related Custodial Account for P&I. From time to time as appropriate for the
servicing or foreclosure of any Mortgage Loan, including, for this purpose,
collection under any Primary Insurance Policy, the Trustee shall, upon request
of the Master Servicer and delivery to it of a trust receipt signed by a
Servicing Officer, release not later than the fifth Business Day following the
date of receipt of such request the related Mortgage File to the Master Servicer
or the related Servicer as indicated by the Master Servicer and shall execute
such documents as shall be necessary to the prosecution of any such proceedings.
Such trust receipt shall obligate the Master Servicer to return the Mortgage
File to the Trustee when the need therefor by the Master Servicer no longer
exists, unless the Mortgage Loan shall be liquidated, in which case, upon
receipt of a certificate of a Servicing Officer similar to that herein above
specified, the trust receipt shall be released by the Trustee to the Master
Servicer.

     Section 3.11.  COMPENSATION TO THE MASTER SERVICER AND THE SERVICERS. As
compensation for its activities hereunder, the Master Servicer shall be entitled
to receive from the Investment Account or the Certificate Account the amounts
provided for by Section 3.05(a)(iii). The Master Servicer shall be required to
pay all expenses incurred by it in connection with its activities hereunder and
shall not be entitled to reimbursement therefor, except as specifically provided
herein.

     As compensation for its activities under the applicable Selling and
Servicing Contract, the applicable Servicer shall be entitled to withhold or
withdraw from the related Custodial Account for P&I the amounts provided for in
such Selling and Servicing Contract. Each Servicer is required to pay all
expenses incurred by it in connection with its servicing activities under its
Selling and Servicing Contract (including payment of premiums for Primary
Insurance Policies, if required) and shall not be entitled to reimbursement
therefor except as specifically provided in such Selling and Servicing Contract
and not inconsistent with this Agreement.

     Section 3.12.  REPORTS TO THE TRUSTEE; CERTIFICATE ACCOUNT STATEMENT. Not
later than 15 days after each Distribution Date, the Master Servicer shall
forward a statement, certified by a Servicing Officer, to the Trustee setting
forth the status of the Certificate Account as of the close of business on such
Distribution Date and showing, for the period covered by such statement, the
aggregate of deposits into and withdrawals from the Certificate Account for each
category of deposit specified in Section 3.04 and each category of withdrawal
specified in Section 3.05, and stating that all distributions required by this
Agreement have been made (or if any required distribution has not been made,
specifying the nature and amount thereof).  The Trustee shall provide such
statements to any Certificateholder upon request at the expense of the Master
Servicer.  Such statement shall also, to the extent available, include
information regarding delinquencies on the Mortgage Loans, indicating the number
and aggregate Principal Balance of Mortgage Loans which are one, two, three or
more months delinquent, the number and aggregate Principal Balance of Mortgage
Loans with respect to which foreclosure proceedings have been initiated and the
book value of any Mortgaged Property acquired by the REMIC I Trust Fund


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through foreclosure, deed in lieu of foreclosure or other exercise of the REMIC
I Trust Fund's security interest in the Mortgaged Property.

     Section 3.13.  ANNUAL STATEMENT AS TO COMPLIANCE. The Master Servicer shall
deliver to the Trustee, on or before April 30 of each year, beginning with the
first April 30 succeeding the Cut-Off Date by at least six months, an Officer's
Certificate stating as to the signer thereof, that (i) a review of the
activities of the Master Servicer during the preceding calendar year and
performance under this Agreement has been made under such officer's supervision,
and (ii) to the best of such officer's knowledge, based on such review, the
Master Servicer has fulfilled all its obligations under this Agreement
throughout such year, or, if there has been a default in the fulfillment of any
such obligation, specifying each such default known to such officer and the
nature and status thereof. Copies of such statement shall be provided by the
Master Servicer to Certificateholders upon request or by the Trustee (solely to
the extent that such copies are available to the Trustee) at the expense of the
Master Servicer, should the Master Servicer fail to so provide such copies.

     Section 3.14.  ACCESS TO CERTAIN DOCUMENTATION AND INFORMATION REGARDING
THE MORTGAGE LOANS. In the event that the Certificates are legal for investment
by federally-insured savings associations, the Master Servicer shall provide to
the OTS, the FDIC and the supervisory agents and examiners of the OTS and the
FDIC access to the documentation regarding the related Mortgage Loans required
by applicable regulations of the OTS or the FDIC, as applicable, and shall in
any event provide such access to the documentation regarding such Mortgage Loans
to the Trustee and its representatives, such access being afforded without
charge, but only upon reasonable request and during normal business hours at the
offices of the Master Servicer designated by it.

     Section 3.15.  ANNUAL INDEPENDENT PUBLIC ACCOUNTANTS' SERVICING REPORT. On
or before April 30 of each year, beginning with the first April 30 succeeding
the Cut-Off Date by at least six months, the Master Servicer, at its expense,
shall cause a firm of independent public accountants to furnish a statement to
the Trustee to the effect that, in connection with the firm's examination of the
financial statements as of the previous December 31 of the Master Servicer's
parent corporation (which shall include a limited examination of the Master
Servicer's financial statements), nothing came to their attention that indicated
that the Master Servicer was not in compliance with Section 3.02, Section 3.03,
Section 3.04, Section 3.05, Section 3.11, Section 3.12 and Section 3.13 of this
Agreement, except for (i) such exceptions as such firm believes to be
immaterial, and (ii) such other exceptions as are set forth in such statement.

     Section 3.16.  [RESERVED].

     Section 3.17.  [RESERVED.]

     Section 3.18.  [RESERVED.]

     Section 3.19.  [RESERVED.]


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     Section 3.20.  ASSUMPTION OR TERMINATION OF SELLING AND SERVICING CONTRACTS
BY TRUSTEE. In the event the Master Servicer, or any successor Master Servicer,
shall for any reason no longer be the Master Servicer (including by reason of an
Event of Default), the Trustee as trustee hereunder or its designee shall
thereupon assume all of the rights and obligations of the Master Servicer under
the Selling and Servicing Contracts with respect to the related Mortgage Loans
unless the Trustee elects to terminate the Selling and Servicing Contracts with
respect to such Mortgage Loans in accordance with the terms thereof. The
Trustee, its designee or the successor servicer for the Trustee shall be deemed
to have assumed all of the Master Servicer's interest therein with respect to
the related Mortgage Loans and to have replaced the Master Servicer as a party
to the Selling and Servicing Contracts to the same extent as if the rights and
duties under the Selling and Servicing Contracts relating to such Mortgage Loans
had been assigned to the assuming party, except that the Master Servicer shall
not thereby be relieved of any liability or obligations under the Selling and
Servicing Contracts with respect to the Master Servicer's duties to be performed
prior to its termination hereunder.

     The Master Servicer at its expense shall, upon request of the Trustee,
deliver to the assuming party all documents and records relating to the Selling
and Servicing Contracts and the Mortgage Loans then being master serviced by the
Master Servicer and an accounting of amounts collected and held by the Master
Servicer and otherwise use its best efforts to effect the orderly and efficient
transfer of the rights and duties under the related Selling and Servicing
Contracts relating to such Mortgage Loans to the assuming party.

                                  ARTICLE IV

                PAYMENTS TO CERTIFICATEHOLDERS; PAYMENT OF EXPENSES

     Section 4.01.  DISTRIBUTIONS TO HOLDERS OF REMIC I REGULAR INTERESTS AND
CLASS R-1 CERTIFICATEHOLDERS.  On each Distribution Date, the Trustee (or any
duly appointed paying agent) (i) shall be deemed to have distributed from the
Certificate Account the REMIC I Distribution Amount to the Holders of the REMIC
I Regular Interests and to have deposited such amount for their benefit into the
Certificate Account and (ii) from the Certificate Account shall distribute to
the Class R-1 Certificateholders the sum of (a) the Excess Liquidation Proceeds
and (b) the amounts to be distributed to the Class R-1 Certificateholders
pursuant to the definition of "REMIC I Distribution Amount" for such
Distribution Date, all in accordance with written statements received from the
Master Servicer pursuant to Section 4.02(b), by wire transfer in immediately
available funds for the account of the Class R-1 Certificateholder, or by any
other means of payment acceptable to each such Class R-1 Certificateholder of
record on the immediately preceding Record Date (other than as provided in
Section 9.01 respecting the final distribution), as specified by each such
Certificateholder and at the address of such Holder appearing in the Certificate
Register. Notwithstanding any other provision of this Agreement, no actual
distributions pursuant to clause (i) of this Section 4.01 shall be made on
account of the deemed distributions described in this paragraph except in the
event of a liquidation of REMIC II and not REMIC I.

     Section 4.02.  ADVANCES BY THE MASTER SERVICER; DISTRIBUTION REPORTS TO THE
TRUSTEE.


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     (a)  To the extent described below, the Master Servicer is obligated to
advance its own funds to the Certificate Account to cover any shortfall between
(i) payments scheduled to be received in respect of Mortgage Loans, and (ii) the
amounts actually deposited in the Certificate Account on account of such
payments; provided that, with respect to any Balloon Loan that is delinquent on
its maturity date, the Master Servicer will not be required to advance the
related balloon payment but will be required to continue to make advances in
accordance with this Section 4.02 with respect to such Balloon Loan in an amount
equal to one month's interest on the unpaid principal balance at the applicable
Pass-Through Rate for each Distribution Date. The Master Servicer's obligation
to make any advance or advances described in this Section 4.02 is effective only
to the extent that such advance is, in the good faith judgment of the Master
Servicer made on or before the Business Day immediately following the Withdrawal
Date, reimbursable from Insurance Proceeds or Liquidation Proceeds of the
related Mortgage Loans or recoverable as late Monthly Payments with respect to
the related Mortgage Loans or otherwise.

     Prior to the close of business on the Business Day immediately following
each Withdrawal Date, the Master Servicer shall determine whether or not it will
make a Monthly P&I Advance on the Business Day prior to the next succeeding
Distribution Date (in the event that the applicable Servicer fails to make such
advances) and shall furnish a statement to the Trustee, the Paying Agent, if
any, and to any Certificateholder requesting the same, setting forth the
aggregate amount to be distributed on the next succeeding Distribution Date on
account of principal and interest in respect of the Mortgage Loans, stated
separately. In the event that full scheduled amounts of principal and interest
in respect of the Mortgage Loans shall not have been received by or on behalf of
the Master Servicer prior to such Determination Date and the Master Servicer
shall have determined that a Monthly P&I Advance shall be made in accordance
with this Section 4.02, the Master Servicer shall so specify and shall specify
the aggregate amount of such advance.

     In the event that the Master Servicer shall be required to make a Monthly
P&I Advance, it shall on the Business Day prior to the related Distribution Date
either (i) deposit in the Certificate Account an amount equal to such Monthly
P&I Advance, (ii) make an appropriate entry in the records of the Certificate
Account that funds in such account being held for future distribution or
withdrawal have been, as permitted by this Section 4.02, used by the Master
Servicer to make such Monthly P&I Advance, or (iii) make advances in the form of
any combination of (i) and (ii) aggregating the amount of such Monthly P&I
Advance. Any funds being held for future distribution to Certificateholders and
so used shall be replaced by the Master Servicer by deposit in the Certificate
Account on the Business Day immediately preceding any future Distribution Date
to the extent that funds in the Certificate Account on such Distribution Date
with respect to the Mortgage Loans shall be less than payments to
Certificateholders required to be made on such date with respect to the Mortgage
Loans. Under each Selling and Servicing Contract, the Master Servicer is
entitled to receive from the Custodial Accounts for P&I established by the
Servicers amounts received by the applicable Servicers on particular Mortgage
Loans as late payments of principal and interest or as Liquidation or Insurance
Proceeds and respecting which the Master Servicer has made an unreimbursed
advance of principal and interest. The Master Servicer is also entitled to
receive other amounts from the related Custodial Accounts for P&I established by
the Servicers to reimburse itself for prior Nonrecoverable Advances respecting
Mortgage Loans serviced by such Servicers. The Master Servicer shall deposit
these amounts in the Investment Account prior to withdrawal pursuant to Section
3.05.


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     In accordance with Section 3.05, Monthly P&I Advances are reimbursable to
the Master Servicer from cash in the Investment Account or the Certificate
Account to the extent that the Master Servicer shall determine that any such
advances previously made are Nonrecoverable Advances pursuant to Section 4.03.

     (b)  Prior to Noon New York City time two Business Days prior to each
Distribution Date, the Master Servicer shall provide the Trustee with a
statement regarding the amount of principal and interest, the Residual
Distribution Amount and the Excess Liquidation Proceeds to be distributed to
each Class of REMIC I Regular Interests and each Class of Certificates on such
Distribution Date (such amounts to be determined in accordance with the
definitions of "REMIC I Distribution Amount" and "REMIC II Distribution Amount",
Section 4.01 and Section 4.04 hereof and other related definitions set forth in
Article I hereof).

     Section 4.03.  NONRECOVERABLE ADVANCES. Any advance previously made by a
Servicer pursuant to its Selling and Servicing Contract with respect to a
Mortgage Loan or by the Master Servicer that the Master Servicer shall determine
in its good faith judgment not to be ultimately recoverable from Insurance
Proceeds or Liquidation Proceeds or otherwise with respect to such Mortgage Loan
or recoverable as late Monthly Payments with respect to such Mortgage Loan shall
be a Nonrecoverable Advance. The determination by the Master Servicer that it or
the applicable Servicer has made a Nonrecoverable Advance or that any advance
would constitute a Nonrecoverable Advance, shall be evidenced by an Officer's
Certificate of the Master Servicer delivered to the Trustee on the Determination
Date and detailing the reasons for such determination.  Notwithstanding any
other provision of this Agreement, any insurance policy relating to the Mortgage
Loans, or any other agreement relating to the Mortgage Loans to which the
Company or the Master Servicer is a party, (a) the Company, the Master Servicer,
and each Servicer shall not be obligated to, and shall not, make any advance
that, after reasonable inquiry and in its sole discretion, the Company, the
Master Servicer, or such Servicer shall determine would be a Nonrecoverable
Advance, and (b) the Company, the Master Servicer, and each Servicer shall be
entitled to reimbursement for any advance as provided in Section 3.05(a)(i),
(ii) and (iv) of this Agreement.

     Section 4.04.  DISTRIBUTIONS TO CERTIFICATEHOLDERS (OTHER THAN CLASS R-1
CERTIFICATEHOLDERS).

     (a)  On each Distribution Date, the Trustee (or any duly appointed paying
agent) shall (i) withdraw from the Certificate Account, the REMIC II Available
Distribution Amount for such Distribution Date and shall distribute, from the
amount so withdrawn, to the extent of the REMIC II Available Distribution
Amount, the REMIC II Distribution Amount to the Certificates (other than the
Class R-1 Certificates), all in accordance with written statements received from
the Master Servicer pursuant to Section 4.02(b), by wire transfer in immediately
available funds for the account of, or by check mailed to, each such
Certificateholder of record on the immediately preceding Record Date (other than
as provided in Section 9.01 respecting the final distribution), as specified by
each such Certificateholder and at the address of such Holder appearing in the
Certificate Register.


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     (b)  All reductions in the Certificate Principal Balance of a Certificate
effected by distributions of principal and all allocations of Realized Losses
made on any Distribution Date shall be binding upon all Holders of such
Certificates and of any Certificates issued upon the registration of transfer or
exchange therefor or in lieu thereof, whether or not such distribution is noted
on such Certificate. The final distribution of principal of each Certificates
(and the final distribution upon the Class R-1 and Class R-2 Certificates upon
the termination of REMIC I and REMIC II) shall be payable in the manner provided
above only upon presentation and surrender thereof on or after the Distribution
Date therefor at the office or agency of the Certificate Registrar specified in
the notice delivered pursuant to Section 4.04(c)(ii) and Section 9.01(b).

     (c)  Whenever, on the basis of Curtailments, Payoffs and Monthly Payments
on the Mortgage Loans and Insurance Proceeds and Liquidation Proceeds received
and expected to be received during the Payoff Period, the Master Servicer has
notified the Trustee that it believes that the entire remaining unpaid Class
Principal Balance of any Class of Certificates will become distributable on the
next Distribution Date, the Trustee shall, no later than the 18th day of the
month of such Distribution Date, mail or cause to be mailed to each Person in
whose name a Certificate to be so retired is registered at the close of business
on the Record Date and to the Rating Agencies a notice to the effect that:

          (i)       it is expected that funds sufficient to make such final
     distribution will be available in the Certificate Account on such
     Distribution Date, and

          (ii)      if such funds are available, (A) such final distribution
     will be payable on such Distribution Date, but only upon presentation and
     surrender of such Certificate at the office or agency of the Certificate
     Registrar maintained for such purpose (the address of which shall be set
     forth in such notice), and (B) no interest shall accrue on such Certificate
     after such Distribution Date.

     Section 4.05.  STATEMENTS TO CERTIFICATEHOLDERS. With each distribution
from the Certificate Account on a Distribution Date, the Master Servicer shall
prepare and forward to the Trustee (and to the Company if the Company is no
longer acting as Master Servicer), and the Trustee shall forward to each
Certificateholder, a statement setting forth, to the extent applicable: the
amount of the distribution payable to the applicable Class that represents
principal and the amount that represents interest, and the applicable Class
Principal Balance after giving effect to such distribution.

     Upon request by any Certificateholder or the Trustee, the Master Servicer
shall forward to such Certificateholder, the Trustee and the Company (if the
Company is no longer acting as Master Servicer) an additional report which sets
forth with respect to the Mortgage Loans:

          (a)       The number and aggregate Principal Balance of the Mortgage
     Loans delinquent one, two and three months or more;

          (b)       The (i) number and aggregate Principal Balance of Mortgage
     Loans with respect to which foreclosure proceedings have been initiated,
     and (ii) the number and aggregate book value of Mortgaged Properties
     acquired through foreclosure, deed in lieu


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     of foreclosure or other exercise of rights respecting the Trustee's
     security interest in the Mortgage Loans;

          (c)       The amount of the Group III Special Hazard Coverage and the
     Combined Special Hazard Coverage available to the Senior Certificates
     remaining as of the close of business on the applicable Determination Date;

          (d)       The amount of the Group III Bankruptcy Coverage and the
     Combined Bankruptcy Coverage available to the Senior Certificates remaining
     as of the close of business on the applicable Determination Date;

          (e)       The amount of the Group III Fraud Coverage and Combined
     Fraud Coverage available to the Senior Certificates remaining as of the
     close of business on the applicable Determination Date; and

          (f)       The amount of Realized Losses incurred in respect of each
     Loan Group allocable to the Certificates on the related Distribution Date
     and the cumulative amount of Realized Losses incurred in respect of each
     Loan Group allocated to such Certificates since the Cut-Off Date.

     Upon request by any Certificateholder, the Master Servicer, as soon as
reasonably practicable, shall provide the requesting Certificateholder with such
information as is necessary and appropriate, in the Master Servicer's sole
discretion, for purposes of satisfying applicable reporting requirements under
Rule 144A of the Securities Act.

                                     ARTICLE V

                                  THE CERTIFICATES

     Section 5.01.  THE CERTIFICATES.

     (a)  The Certificates shall be substantially in the forms set forth in
Exhibit A and B with the additional insertion from Exhibit H attached hereto,
and shall be executed by the Trustee, authenticated by the Trustee (or any duly
appointed Authenticating Agent) and delivered to or upon the order of the
Company upon receipt by the Trustee of the documents specified in Section 2.01.
The Certificates shall be issuable in Authorized Denominations evidencing
Percentage Interests. Certificates shall be executed by manual or facsimile
signature on behalf of the Trustee by authorized officers of the Trustee.
Certificates bearing the manual or facsimile signatures of individuals who were
at the time of execution the proper officers of the Trustee shall bind the
Trustee, notwithstanding that such individuals or any of them have ceased to
hold such offices prior to the authentication and delivery of such Certificates
or did not hold such offices at the date of such Certificates. No Certificate
shall be entitled to any benefit under this Agreement, or be valid for any
purpose, unless there appears on such Certificate a certificate of
authentication substantially in the form provided for herein executed by the
Trustee or any Authenticating Agent by manual signature, and such certificate
upon any Certificate shall be conclusive evidence, and


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the only evidence, that such Certificate has been duly authenticated and
delivered hereunder. All Certificates shall be dated the date of their
authentication.

     (b)  The following definitions apply for purposes of this Section 5.01:
"Disqualified Organization" means any Person which is not a Permitted
Transferee, but does not include any "Pass-Through Entity" which owns or holds a
Residual Certificate and of which a Disqualified Organization, directly or
indirectly, may be a stockholder, partner or beneficiary; "Pass-Through Entity"
means any regulated investment company, real estate investment trust, common
trust fund, partnership, trust or estate, and any organization to which Section
1381 of the Code applies; "Ownership Interest" means, with respect to any
Residual Certificate, any ownership or security interest in such Residual
Certificate, including any interest in a Residual Certificate as the Holder
thereof and any other interest therein whether direct or indirect, legal or
beneficial, as owner or as pledgee; "Transfer" means any direct or indirect
transfer or sale of, or directly or indirectly transferring or selling any
Ownership Interest in a Residual Certificate; and "Transferee" means any Person
who is acquiring by Transfer any Ownership Interest in a Residual Certificate.

     (c)  Restrictions on Transfers of the Residual Certificates to Disqualified
Organizations are set forth in this Section 5.01(c).

          (i)       Each Person who has or who acquires any Ownership Interest
     in a Residual Certificate shall be deemed by the acceptance or acquisition
     of such Ownership Interest to have agreed to be bound by the following
     provisions and to have irrevocably authorized the Trustee or its designee
     under clause (iii)(A) below to deliver payments to a Person other than such
     Person and to negotiate the terms of any mandatory sale under clause
     (iii)(B) below and to execute all instruments of transfer and to do all
     other things necessary in connection with any such sale. The rights of each
     Person acquiring any Ownership Interest in a Residual Certificate are
     expressly subject to the following provisions:

                    (A)  Each Person holding or acquiring any Ownership Interest
          in a Residual Certificate shall be a Permitted Transferee and shall
          promptly notify the Trustee of any change or impending change in its
          status as a Permitted Transferee.

                    (B)  In connection with any proposed Transfer of any
          Ownership Interest in a Residual Certificate to a U.S. Person, the
          Trustee shall require delivery to it, and shall not register the
          Transfer of any Residual Certificate until its receipt of (1) an
          affidavit and agreement (a "Transferee Affidavit and Agreement")
          attached hereto as Exhibit J from the proposed Transferee, in form and
          substance satisfactory to the Company, representing and warranting,
          among other things, that it is not a Non-U.S. Person, that such
          transferee is a Permitted Transferee, that it is not acquiring its
          Ownership Interest in the Residual Certificate that is the subject of
          the proposed Transfer as a nominee, trustee or agent for any Person
          who is not a Permitted Transferee, that for so long as it retains its
          Ownership Interest in a Residual Certificate, it will endeavor to
          remain a Permitted Transferee, and that it has reviewed the provisions
          of this Section 5.01(c) and agrees to be bound by them, and (2) a
          certificate, attached hereto as Exhibit I, from the Holder wishing to


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          transfer the Residual Certificate, in form and substance satisfactory
          to the Company, representing and warranting, among other things, that
          no purpose of the proposed Transfer is to allow such Holder to impede
          the assessment or collection of tax.

                    (C)  Notwithstanding the delivery of a Transferee Affidavit
          and Agreement by a proposed Transferee under clause (B) above, if the
          Trustee has actual knowledge that the proposed Transferee is not a
          Permitted Transferee, no Transfer of an Ownership Interest in a
          Residual Certificate to such proposed Transferee shall be effected.

                    (D)  Each Person holding or acquiring any Ownership Interest
          in a Residual Certificate agrees by holding or acquiring such
          Ownership Interest (i) to require a Transferee Affidavit and Agreement
          from any other Person to whom such Person attempts to transfer its
          Ownership Interest and to provide a certificate to the Trustee in the
          form attached hereto as Exhibit J; (ii) to obtain the express written
          consent of the Company prior to any transfer of such Ownership
          Interest, which consent may be withheld in the Company's sole
          discretion; and (iii) to provide a certificate to the Trustee in the
          form attached hereto as Exhibit I.

          (ii)      The Trustee shall register the Transfer of any Residual
     Certificate only if it shall have received the Transferee Affidavit and
     Agreement, a certificate of the Holder requesting such transfer in the form
     attached hereto as Exhibit J and all of such other documents as shall have
     been reasonably required by the Trustee as a condition to such
     registration.

          (iii)     (A)  If any "disqualified organization" (as defined in
     Section 860E(e)(5) of the Code) shall become a holder of a Residual
     Certificate, then the last preceding Permitted Transferee shall be
     restored, to the extent permitted by law, to all rights and obligations as
     Holder thereof retroactive to the date of registration of such Transfer of
     such Residual Certificate. If any Non-U.S. Person shall become a holder of
     a Residual Certificate, then the last preceding holder which is a U.S.
     Person shall be restored, to the extent permitted by law, to all rights and
     obligations as Holder thereof retroactive to the date of registration of
     the Transfer to such Non-U.S. Person of such Residual Certificate. If a
     transfer of a Residual Certificate is disregarded pursuant to the
     provisions of Treasury Regulations Section 1.860E-1 or Section 1.860G-3,
     then the last preceding Permitted Transferee shall be restored, to the
     extent permitted by law, to all rights and obligations as Holder thereof
     retroactive to the date of registration of such Transfer of such Residual
     Certificate. The Trustee shall be under no liability to any Person for any
     registration of Transfer of a Residual Certificate that is in fact not
     permitted by this Section 5.01(c) or for making any payments due on such
     Certificate to the holder thereof or for taking any other action with
     respect to such holder under the provisions of this Agreement.

                    (B)  If any purported Transferee shall become a Holder of a
          Residual Certificate in violation of the restrictions in this Section
          5.01(c) and to the extent that the retroactive restoration of the
          rights of the Holder of such Residual


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          Certificate as described in clause (iii)(A) above shall be invalid,
          illegal or unenforceable, then the Company shall have the right,
          without notice to the Holder or any prior Holder of such Residual
          Certificate, to sell such Residual Certificate to a purchaser selected
          by the Company on such terms as the Company may choose. Such purported
          Transferee shall promptly endorse and deliver each Residual
          Certificate in accordance with the instructions of the Company. Such
          purchaser may be the Company itself or any affiliate of the Company.
          The proceeds of such sale, net of the commissions (which may include
          commissions payable to the Company or its affiliates), expenses and
          taxes due, if any, shall be remitted by the Company to such purported
          Transferee. The terms and conditions of any sale under this clause
          (iii)(B) shall be determined in the sole discretion of the Company,
          and the Company shall not be liable to any Person having an Ownership
          Interest in a Residual Certificate as a result of its exercise of such
          discretion.

          (iv)      The Company, on behalf of the Trustee, shall make available,
     upon written request from the Trustee, all information necessary to compute
     any tax imposed (A) as a result of the Transfer of an Ownership Interest in
     a Residual Certificate to any Person who is not a Permitted Transferee,
     including the information regarding "excess inclusions" of such Residual
     Certificates required to be provided to the Internal Revenue Service and
     certain Persons as described in Treasury Regulation Section 1.860D-1(b)(5),
     and (B) as a result of any regulated investment company, real estate
     investment trust, common trust fund, partnership, trust, estate or
     organizations described in Section 1381 of the Code having as among its
     record holders at any time any Person who is not a Permitted Transferee.
     Reasonable compensation for providing such information may be required by
     the Company from such Person.

          (v)       The provisions of this Section 5.01 set forth prior to this
     Section (v) may be modified, added to or eliminated, provided that there
     shall have been delivered to the Trustee the following:

                    (A)  written notification from each Rating Agencies to the
          effect that the modification, addition to or elimination of such
          provisions will not cause such Rating Agencies to downgrade its
          then-current Ratings of the Certificates; and

                    (B)  an Opinion of Counsel, in form and substance
          satisfactory to the Company (as evidenced by a certificate of the
          Company), to the effect that such modification, addition to or absence
          of such provisions will not cause REMIC I and REMIC II to cease to
          qualify as a REMIC and will not create a risk that (1) REMIC I and
          REMIC II may be subject to an entity-level tax caused by the Transfer
          of any Residual Certificate to a Person which is not a Permitted
          Transferee or (2) a Certificateholder or another Person will be
          subject to a REMIC-related tax caused by the Transfer of a Residual
          Certificate to a Person which is not a Permitted Transferee.

          (vi)      The following legend shall appear on all Residual
     Certificates:


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     ANY RESALE, TRANSFER OR OTHER DISPOSITION OF THIS CERTIFICATE MAY BE MADE
     ONLY IF THE PROPOSED TRANSFEREE PROVIDES A TRANSFER AFFIDAVIT TO THE
     COMPANY AND THE TRUSTEE THAT (1) SUCH TRANSFEREE IS NOT EITHER (A) THE
     UNITED STATES, ANY STATE OR POLITICAL SUBDIVISION THEREOF, ANY FOREIGN
     GOVERNMENT, ANY INTERNATIONAL ORGANIZATION, OR ANY AGENCY OR
     INSTRUMENTALITY OF ANY OF THE FOREGOING, (B) ANY ORGANIZATION (OTHER THAN A
     COOPERATIVE DESCRIBED IN SECTION 521 OF THE CODE) WHICH IS EXEMPT FROM THE
     TAX IMPOSED BY CHAPTER 1 OF THE CODE UNLESS SUCH ORGANIZATION IS SUBJECT TO
     THE TAX IMPOSED BY SECTION 511 OF THE CODE, (C) ANY ORGANIZATION DESCRIBED
     IN SECTION 1381(a)(2)(C) OF THE CODE (ANY SUCH PERSON DESCRIBED IN THE
     FOREGOING CLAUSES (A), (B), OR (C) BEING HEREINAFTER REFERRED TO AS A
     "DISQUALIFIED ORGANIZATION"), OR (D) AN AGENT OF A DISQUALIFIED
     ORGANIZATION AND (2) NO PURPOSE OF SUCH TRANSFER IS TO ENABLE THE
     TRANSFEROR TO IMPEDE THE ASSESSMENT OR COLLECTION OF TAX. SUCH AFFIDAVIT
     SHALL INCLUDE CERTAIN REPRESENTATIONS AS TO THE FINANCIAL CONDITION OF THE
     PROPOSED TRANSFEREE. NOTWITHSTANDING THE REGISTRATION IN THE CERTIFICATE
     REGISTER OF ANY TRANSFER, SALE OR OTHER DISPOSITION OF THIS CLASS [R-1]
     [R-2] CERTIFICATE TO A DISQUALIFIED ORGANIZATION OR AN AGENT OF A
     DISQUALIFIED ORGANIZATION, SUCH REGISTRATION SHALL BE DEEMED TO BE OF NO
     LEGAL FORCE OR EFFECT WHATSOEVER AND SUCH PERSON SHALL NOT BE DEEMED TO BE
     A CERTIFICATEHOLDER FOR ANY PURPOSE HEREUNDER, INCLUDING, BUT NOT LIMITED
     TO, THE RECEIPT OF DISTRIBUTIONS ON THIS CERTIFICATE. EACH HOLDER OF THE
     CLASS [R-1][R-2] CERTIFICATE BY ACCEPTANCE OF THIS CERTIFICATE SHALL BE
     DEEMED TO HAVE CONSENTED TO THE PROVISIONS OF THIS PARAGRAPH.

          (vii)     The Tax Matters Person for each of REMIC I or REMIC II,
     while not a Disqualified Organization, shall be the tax matters person for
     the related REMIC within the meaning of Section 6231(a)(7) of the Code and
     Treasury Regulation Section 1.860F-4(d).

     (d)  In the case of any Class B or Residual Certificates presented for
registration in the name of an employee benefit plan or other plan or
arrangement subject to the prohibited transaction provisions of ERISA or Section
4975 of the Code (or comparable provisions of any subsequent enactments) (a
"Plan"), a trustee of any Plan, or any other Person who is using the "plan
assets" of any Plan to effect such acquisition, the Trustee shall require (i) an
Opinion of Counsel acceptable to and in form and substance satisfactory to the
Trustee and the Company to the effect that the purchase or holding of a Class B
or Residual Certificate is permissible under applicable law, will not constitute
or result in a non-exempt prohibited transaction under Section 406 of ERISA or
Section 4975 of the Code, and will not subject the Trustee, the Master Servicer
or the Company to any obligation or liability (including obligations or
liabilities under Section 406 of ERISA or Section 4975 of the Code) in addition
to those undertaken in this Agreement, which


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Opinion of Counsel shall not be an expense of the Trustee, the Master Servicer
or the Company or (ii) only in the case of a Class B Certificate, an officer's
certificate acceptable to and in form and substance satisfactory to the Trustee
and the Company to the effect that the transferee is an insurance company, the
source of funds to be used by it to purchase the Class B Certificate is an
"insurance company general account" (within the meaning of Department of Labor
Prohibited Transaction Class Exemption ("PTCE") 95-60), and the purchase is
being made in reliance upon the availability of the exemptive relief afforded
under Sections I and III of PTCE 95-60, which officer's certificate shall not be
an expense of the Trustee, the Master Servicer or the Company.

     (e)  No transfer, sale, pledge or other disposition of a Junior Subordinate
Certificate shall be made unless such transfer, sale, pledge or other
disposition is made in accordance with this Section 5.01(e) or Section 5.01(f).
Each Person who, at any time, acquires any ownership interest in any Junior
Subordinate Certificate shall be deemed by the acceptance or acquisition of such
ownership interest to have agreed to be bound by the following provisions of
this Section 5.01(e) and Section 5.01(f), as applicable. No transfer of a Junior
Subordinate Certificate shall be deemed to be made in accordance with this
Section 5.01(e) unless such transfer is made pursuant to an effective
registration statement under the Securities Act or unless the Trustee is
provided with the certificates and an Opinion of Counsel, if required, on which
the Trustee may conclusively rely, which establishes or establish to the
Trustee's satisfaction that such transfer is exempt from the registration
requirements under the Securities Act, as follows:  In the event that a transfer
is to be made in reliance upon an exemption from the Securities Act, the Trustee
shall require, in order to assure compliance with the Securities Act, that the
Certificateholder desiring to effect such transfer certify to the Trustee in
writing, in substantially the form attached hereto as Exhibit F, the facts
surrounding the transfer, with such modifications to such Exhibit F as may be
appropriate to reflect the actual facts of the proposed transfer, and that the
Certificateholder's proposed transferee certify to the Trustee in writing, in
substantially the form attached hereto as Exhibit G, the facts surrounding the
transfer, with such modifications to such Exhibit G as may be appropriate to
reflect the actual facts of the proposed transfer. If such certificate of the
proposed transferee does not contain substantially the substance of Exhibit G,
the Trustee shall require an Opinion of Counsel satisfactory to it that such
transfer may be made without registration, which Opinion of Counsel shall not be
obtained at the expense of the Trustee, the REMIC I Trust Fund, the REMIC II
Trust Fund or the Company. Such Opinion of Counsel shall allow for the
forwarding, and the Trustee shall forward, a copy thereof to the Rating
Agencies. Notwithstanding the foregoing, any Junior Subordinate Certificate may
be transferred, sold, pledged or otherwise disposed of in accordance with the
requirements set forth in Section 5.01(f).

     (f)  To effectuate a Certificate transfer of a Junior Subordinate
Certificate in accordance with this Section 5.01(f), the proposed transferee of
such Certificate must provide the Trustee and the Company with an investment
letter substantially in the form of Exhibit L attached hereto, which investment
letter shall not be an expense of the Trustee or the Company, and which
investment letter states that, among other things, such transferee (i) is a
"qualified institutional buyer" as defined under Rule 144A, acting for its own
account or the accounts of other "qualified institutional buyers" as defined
under Rule 144A, and (ii) is aware that the proposed transferor intends to rely
on the exemption from registration requirements under the Securities Act
provided by Rule 144A. Notwithstanding the foregoing, the proposed transferee of
such Certificate shall not be required to provide the Trustee or the Company
with Annex 1 or Annex 2 to the form of


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Exhibit L attached hereto if the Company so consents prior to each such
transfer. Such transfers shall be deemed to have complied with the requirements
of this Section 5.01(f). The Holder of a Certificate desiring to effect such
transfer does hereby agree to indemnify the Trustee, the Company, and the
Certificate Registrar against any liability that may result if transfer is not
made in accordance with this Agreement.

     Section 5.02.  CERTIFICATES ISSUABLE IN CLASSES; DISTRIBUTIONS OF PRINCIPAL
AND INTEREST; AUTHORIZED DENOMINATIONS. The aggregate principal amount of the
Certificates that may be authenticated and delivered under this Agreement is
limited to the aggregate Principal Balance of the Mortgage Loans as of the
Cut-Off Date, as specified in the Preliminary Statement to this Agreement,
except for Certificates authenticated and delivered upon registration of
transfer of, or in exchange for, or in lieu of, other Certificates pursuant to
Section 5.03. Such aggregate principal amount shall be allocated among one or
more Classes having designations, types of interests, initial per annum
Remittance Rates, initial Class Principal Balances, initial Component Principal
Balances and last scheduled Distribution Dates as specified in the Preliminary
Statement to this Agreement. The aggregate Percentage Interest of each Class of
Certificates of which the Class Principal Balance equals zero as of the Cut-Off
Date that may be authenticated and delivered under this Agreement is limited to
100%. Certificates shall be issued in Authorized Denominations.

     Section 5.03.  REGISTRATION OF TRANSFER AND EXCHANGE OF CERTIFICATES. The
Trustee shall cause to be maintained at one of its offices or at its designated
agent, a Certificate Register in which there shall be recorded the name and
address of each Certificateholder. Subject to such reasonable rules and
regulations as the Trustee may prescribe, the Certificate Register shall be
amended from time to time by the Trustee or its agent to reflect notice of any
changes received by the Trustee or its agent pursuant to Section 10.06. The
Trustee hereby appoints itself as the initial Certificate Registrar.

     Upon surrender for registration of transfer of any Certificate to the
Trustee at the office of First Trust of New York, National Association, 100 Wall
Street, Suite 1600, New York, NY 10005, Attention: Tom Bowen, or such other
address or agency as may hereafter be provided to the Master Servicer in writing
by the Trustee, the Trustee shall execute, and the Trustee or any Authenticating
Agent shall authenticate and deliver, in the name of the designated transferee
or transferees, one or more new Certificates of Authorized Denominations of like
Percentage Interest. At the option of the Certificateholders, Certificates may
be exchanged for other Certificates in Authorized Denominations of like
Percentage Interest, upon surrender of the Certificates to be exchanged at any
such office or agency. Whenever any Certificates are so surrendered for
exchange, the Trustee shall execute, and the Trustee, or any Authenticating
Agent, shall authenticate and deliver, the Certificates which the
Certificateholder making the exchange is entitled to receive. Every Certificate
presented or surrendered for transfer shall (if so required by the Trustee or
any Authenticating Agent) be duly endorsed by, or be accompanied by a written
instrument of transfer in form satisfactory to the Trustee or any Authenticating
Agent and duly executed by, the Holder thereof or such Holder's attorney duly
authorized in writing.

     A reasonable service charge may be made for any such exchange or transfer
of Certificates, and the Trustee may require payment of a sum sufficient to
cover any tax or


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governmental charge that may be imposed in connection with any exchange or
transfer of Certificates.

     All Certificates surrendered for exchange or transfer shall be cancelled by
the Trustee or any Authenticating Agent.

     Section 5.04.  MUTILATED, DESTROYED, LOST OR STOLEN CERTIFICATES. If (i)
any mutilated Certificate is surrendered to the Trustee or any Authenticating
Agent, or (ii) the Trustee or any Authenticating Agent receives evidence to
their satisfaction of the destruction, loss or theft of any Certificate, and
there is delivered to the Trustee or any Authenticating Agent such security or
indemnity as may be required by them to save each of them harmless, then, in the
absence of notice to the Trustee or any Authenticating Agent that such
Certificate has been acquired by a bona fide purchaser, the Trustee shall
execute and the Trustee or any Authenticating Agent shall authenticate and
deliver, in exchange for or in lieu of any such mutilated, destroyed, lost or
stolen Certificate, a new Certificate of like Percentage Interest. Upon the
issuance of any new Certificate under this Section 5.04, the Trustee or any
Authenticating Agent may require the payment of a sum sufficient to cover any
tax or other governmental charge that may be imposed in relation thereto and any
other expenses (including the fees and expenses of the Trustee or any
Authenticating Agent) connected therewith. Any replacement Certificate issued
pursuant to this Section 5.04 shall constitute complete and indefeasible
evidence of ownership in the REMIC II Trust Fund (or with respect to the Class
R-1 Certificates, the residual ownership interests in the REMIC I Trust Fund) as
if originally issued, whether or not the lost or stolen Certificate shall be
found at any time.

     Section 5.05.  PERSONS DEEMED OWNERS. The Company, the Master Servicer, the
Trustee and any agent of any of them may treat the Person in whose name any
Certificate is registered as the owner of such Certificate for the purpose of
receiving distributions pursuant to Section 4.01 and Section 4.04 and for all
other purposes whatsoever, and neither the Company, the Master Servicer, the
Trustee, the Certificate Registrar nor any agent of the Company, the Master
Servicer or the Trustee shall be affected by notice to the contrary.

     Section 5.06.  TEMPORARY CERTIFICATES. Upon the initial issuance of the
Certificates, the Trustee may execute, and the Trustee or any Authenticating
Agent shall authenticate and deliver, temporary Certificates which are printed,
lithographed, typewritten or otherwise produced, in any Authorized Denomination,
of the tenor of the definitive Certificates in lieu of which they are issued and
with such variations in form from the forms of the Certificates set forth as
Exhibits A, B and H hereto as the Trustee's officers executing such Certificates
may determine, as evidenced by their execution of the Certificates.
Notwithstanding the foregoing, the Certificates may remain in the form set forth
in this definition of "Temporary Certificates."

     If temporary Certificates are issued, the Trustee shall cause definitive
Certificates to be prepared within ten Business Days of the Closing Date or as
soon as practicable thereafter. After preparation of definitive Certificates,
the temporary Certificates shall be exchangeable for definitive Certificates
upon surrender of the temporary Certificates at the office or agency of the
Trustee to be maintained as provided in Section 5.10 hereof, without charge to
the holder. Any tax or governmental charge that may be imposed in connection
with any such exchange shall be


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borne by the Master Servicer. Upon surrender for cancellation of any one or more
temporary Certificates, the Trustee shall execute and the Trustee or any
Authenticating Agent shall authenticate and deliver in exchange therefor a like
principal amount of definitive Certificates of Authorized Denominations. Until
so exchanged, the temporary Certificates shall in all respects be entitled to
the same benefits under this Agreement as definitive Certificates.

     Section 5.07.  BOOK-ENTRY FOR BOOK-ENTRY CERTIFICATES. Notwithstanding the
foregoing, the Book-Entry Certificates, upon original issuance, shall be issued
in the form of one or more typewritten Certificates of Authorized Denomination
representing the Book-Entry Certificates, to be delivered to DTC, the initial
Clearing Agency, by, or on behalf of, the Company. The Book-Entry Certificates
shall initially be registered on the Certificate Register in the name of Cede &
Co., the nominee of DTC, as the initial Clearing Agency, and no Beneficial
Holder shall receive a definitive certificate representing such Beneficial
Holder's interest in any Class of Book-Entry Certificate, except as provided
above and in Section 5.09. Each Book-Entry Certificate shall bear the following
legend:

     Unless this Certificate is presented by an authorized representative
     of The Depository Trust Company, a New York corporation ("DTC"), to
     the Trustee or its agent for registration of transfer, exchange, or
     payment, and any Certificate issued is registered in the name of Cede
     & Co. or such other name as is requested by an authorized
     representative of DTC (and any payment is made to Cede & Co. or to
     such other entity as is requested by an authorized representative of
     DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE
     BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
     hereof, Cede & Co., has an interest herein.

Unless and until definitive, fully registered Book-Entry Certificates (the
"Definitive Certificates") have been issued to the Beneficial Holders pursuant
to Section 5.09:

          (a)       the provisions of this Section 5.07 shall be in full force
     and effect with respect to the Book-Entry Certificates;

          (b)       the Master Servicer and the Trustee may deal with the
     Clearing Agency for all purposes with respect to the Book-Entry
     Certificates (including the making of distributions on the Book-Entry
     Certificates) as the sole Certificateholder;

          (c)       to the extent that the provisions of this Section 5.07
     conflict with any other provisions of this Agreement, the provisions of
     this Section 5.07 shall control; and

          (d)       the rights of the Beneficial Holders shall be exercised only
     through the Clearing Agency and the DTC Participants and shall be limited
     to those established by law and agreements between such Beneficial Holders
     and the Clearing Agency and/or the DTC Participants. Pursuant to the
     Depositary Agreement, unless and until Definitive Certificates are issued
     pursuant to Section 5.09, the initial Clearing Agency will make book-entry
     transfers among the DTC Participants and receive and transmit distributions
     of


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     principal and interest on the related Class of Book-Entry Certificates to
     such DTC Participants.

     For purposes of any provision of this Agreement requiring or permitting
actions with the consent of, or at the direction of, Holders of Book-Entry
Certificates evidencing a specified Percentage Interest, such direction or
consent may be given by the Clearing Agency at the direction of Beneficial
Holders owning Book-Entry Certificates evidencing the requisite Percentage
Interest represented by the Book-Entry Certificates. The Clearing Agency may
take conflicting actions with respect to the Book-Entry Certificates to the
extent that such actions are taken on behalf of the Beneficial Holders.

     Section 5.08.  NOTICES TO CLEARING AGENCY. Whenever notice or other
communication to the Certificateholders is required under this Agreement, unless
and until Definitive Certificates shall have been issued to the related
Certificateholders pursuant to Section 5.09, the Trustee shall give all such
notices and communications specified herein to be given to Holders of the
Book-Entry Certificates to the Clearing Agency which shall give such notices and
communications to the related DTC Participants in accordance with its applicable
rules, regulations and procedures.

     Section 5.09.  DEFINITIVE CERTIFICATES. If (a) the Master Servicer notifies
the Trustee in writing that the Clearing Agency is no longer willing or able to
discharge properly its responsibilities under the Depositary Agreement with
respect to the Book-Entry Certificates and the Trustee or the Master Servicer is
unable to locate a qualified successor, (b) the Master Servicer, at its option,
advises the Trustee in writing that it elects to terminate the book-entry system
with respect to the Book-Entry Certificates through the Clearing Agency or (c)
after the occurrence of an Event of Default, Certificateholders holding
Book-Entry Certificates evidencing Percentage Interests aggregating not less
than 66% of the aggregate Class Principal Balance of such Certificates advise
the Trustee and the Clearing Agency through DTC Participants in writing that the
continuation of a book-entry system with respect to the Book-Entry Certificates
through the Clearing Agency is no longer in the best interests of the
Certificateholders with respect to such Certificates, the Trustee shall notify
all Certificateholders of Book-Entry Certificates of the occurrence of any such
event and of the availability of Definitive Certificates. Upon surrender to the
Trustee of the Book-Entry Certificates by the Clearing Agency, accompanied by
registration instructions from the Clearing Agency for registration, the Trustee
shall execute and the Trustee or any Authenticating Agent shall authenticate and
deliver the Definitive Certificates. Neither the Company, the Master Servicer
nor the Trustee shall be liable for any delay in delivery of such instructions
and may conclusively rely on, and shall be protected in relying on, such
instructions. Upon the issuance of Definitive Certificates for all of the
Certificates all references herein to obligations imposed upon or to be
performed by the Clearing Agency shall be deemed to be imposed upon and
performed by the Trustee, to the extent applicable with respect to such
Definitive Certificates, and the Trustee shall recognize the Holders of
Definitive Certificates as Certificateholders hereunder.

     Section 5.10.  OFFICE FOR TRANSFER OF CERTIFICATES. The Trustee shall
maintain in New York, New York, an office or agency where Certificates may be
surrendered for registration of transfer or exchange. First Trust of New York,
National Association, 100 Wall Street, Suite


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1600, New York, New York 10005, Attention:  Tom Bowen, is initially designated
for said purposes.

                                    ARTICLE VI

                        The Company and the Master Servicer

     Section 6.01.  LIABILITY OF THE COMPANY AND THE MASTER SERVICER. The
Company and the Master Servicer shall be liable in accordance herewith only to
the extent of the obligations specifically imposed upon and undertaken by the
Company or the Master Servicer, as applicable, herein.

     Section 6.02.  MERGER OR CONSOLIDATION OF THE COMPANY, OR THE MASTER
SERVICER. Any corporation into which the Company or the Master Servicer may be
merged or consolidated, or any corporation resulting from any merger, conversion
or consolidation to which the Company or the Master Servicer shall be a party,
or any corporation succeeding to the business of the Company or the Master
Servicer, shall be the successor of the Company or the Master Servicer
hereunder, without the execution or filing of any paper or any further act on
the part of any of the parties hereto, anything herein to the contrary
notwithstanding.

     Section 6.03.  LIMITATION ON LIABILITY OF THE COMPANY, THE MASTER SERVICER
AND OTHERS. Neither the Company nor the Master Servicer nor any of the
directors, officers, employees or agents of the Company or the Master Servicer
shall be under any liability to the REMIC I or REMIC II Trust Fund or the
Certificateholders for any action taken by such Person or by a Servicer or for
such Person's or Servicer's refraining from the taking of any action in good
faith pursuant to this Agreement, or for errors in judgment; provided, however,
that this provision shall not protect the Company, the Master Servicer or any
such Person against any liability which would otherwise be imposed by reason of
willful misfeasance, bad faith or gross negligence in the performance of duties
or by reason of reckless disregard of duties and obligations hereunder. The
Company, the Master Servicer and any director, officer, employee or agent of the
Company or the Master Servicer may rely in good faith on any document of any
kind properly executed and submitted by any Person respecting any matters
arising hereunder. The Company, the Master Servicer and any director, officer,
employee or agent of the Company or the Master Servicer shall be indemnified by
the REMIC I Trust Fund and held harmless against any loss, liability or expense
incurred in connection with any legal action relating to this Agreement or the
Certificates, other than any loss, liability or expense relating to any Mortgage
Loan (other than as otherwise permitted in this Agreement) or incurred by reason
of willful misfeasance, bad faith or gross negligence in the performance of
duties hereunder or by reason of reckless disregard of obligations and duties
hereunder. The Company and the Master Servicer shall not be under any obligation
to appear in, prosecute or defend any legal action which is not incidental to
its duties to service the Mortgage Loans in accordance with this Agreement and
which in its opinion may involve it in any expense or liability; provided,
however, that the Company or the Master Servicer may in its discretion undertake
any such action which it may deem necessary or desirable with respect to the
Mortgage Loans, this Agreement, the Certificates or the rights and duties of the
parties hereto and the interests of the Certificateholders hereunder. In such
event, the legal expenses and costs of such action and any liability resulting
therefrom shall be expenses, costs and


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liabilities of the REMIC I Trust Fund and the Company and the Master Servicer
shall be entitled to be reimbursed therefor out of the Certificate Account, as
provided by Section 3.05.

     Section 6.04.  THE COMPANY AND THE MASTER SERVICER NOT TO RESIGN. The
Company shall not resign from the obligations and duties (including, without
limitation, its obligations and duties as initial Master Servicer) hereby
imposed on it except upon determination that its duties hereunder are no longer
permissible under applicable law. Any successor Master Servicer shall not resign
from the obligations and duties hereby imposed on it except upon determination
that its duties hereunder are no longer permissible under applicable law. Any
such determination permitting the resignation of the Company or any successor
Master Servicer shall be evidenced by an Opinion of Counsel to such effect
delivered to the Trustee. No such resignation shall become effective until the
Trustee or a successor Master Servicer shall have assumed the Master Servicer's
responsibilities and obligations in accordance with Section 7.02 hereof.

          If the Company is no longer acting as Master Servicer, then the
successor Master Servicer shall give prompt written notice to the Company of any
information received by such successor Master Servicer which affects or relates
to an ongoing obligation or right of the Company under this Agreement.

                                   ARTICLE VII

                                     DEFAULT

     Section 7.01.  EVENTS OF DEFAULT. (a) In case one or more of the following
Events of Default by the Master Servicer or by a successor Master Servicer shall
occur and be continuing, that is to say:

          (i)       Any failure by the Master Servicer to deposit into the
     Certificate Account any payment required to be deposited therein under the
     terms of this Agreement which continues unremedied for a period of ten days
     after the date upon which written notice of such failure, requiring the
     same to be remedied, shall have been given to the Master Servicer by the
     Trustee or to the Master Servicer and the Trustee by the Holders of
     Certificates evidencing Percentage Interests aggregating not less than 25%
     of the REMIC II Trust Fund; or

          (ii)      Failure on the part of the Master Servicer duly to observe
     or perform in any material respect any other of the covenants or agreements
     on the part of the Master Servicer contained in the Certificates or in this
     Agreement which continues unremedied for a period of 60 days after the date
     on which written notice of such failure, requiring the same to be remedied,
     shall have been given to the Master Servicer by the Trustee, or to the
     Master Servicer and the Trustee by the Holders of Certificates evidencing
     Percentage Interests aggregating not less than 25% of the REMIC II Trust
     Fund; or

          (iii)     A decree or order of a court or agency or supervisory
     authority having jurisdiction in the premises for the appointment of a
     trustee in bankruptcy,


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     conservator or receiver or liquidator in any bankruptcy, insolvency,
     readjustment of debt, marshalling of assets and liabilities or similar
     proceedings, or for the winding-up or liquidation of its affairs, shall
     have been entered against the Master Servicer and such decree or order
     shall have remained in force undischarged or unstayed for a period of 60
     days; or

          (iv)      The Master Servicer shall consent to the appointment of a
     trustee in bankruptcy, conservator or receiver or liquidator in any
     bankruptcy, insolvency, readjustment of debt, marshalling of assets and
     liabilities or similar proceedings of or relating to the Master Servicer or
     of or relating to all or substantially all of its property; or

          (v)       The Master Servicer shall admit in writing its inability to
     pay its debts generally as they become due, file a petition to take
     advantage of any applicable bankruptcy, insolvency or reorganization
     statute, make an assignment for the benefit of its creditors, or
     voluntarily suspend payment of its obligations; or

          (vi)      Any failure of the Master Servicer to make any Monthly P&I
     Advance (other than a Nonrecoverable Advance) which continues unremedied at
     the opening of business on the Distribution Date in respect of which such
     Monthly P&I Advance was to have been made;

then, and in each and every such case, so long as an Event of Default shall not
have been remedied, either the Trustee, or the Holders of Certificates
evidencing Percentage Interests aggregating not less than 25% of the REMIC II
Trust Fund, by notice in writing to the Company and the Master Servicer (and to
the Trustee if given by the Certificateholders, in which case such notice shall
set forth evidence reasonably satisfactory to the Trustee that such Event of
Default has occurred and shall not have been remedied) may terminate all of the
rights (other than its right to reimbursement for advances) and obligations of
the Master Servicer, including its right to the Master Servicing Fee, under this
Agreement and in and to the Mortgage Loans and the proceeds thereof, if any.
Such determination shall be final and binding. On or after the receipt by the
Master Servicer of such written notice, all authority and power of the Master
Servicer under this Agreement, whether with respect to the Certificates or the
Mortgage Loans or otherwise, shall pass to and be vested in the Trustee pursuant
to and under this Section 7.01; and, without limitation, the Trustee is hereby
authorized and empowered to execute and deliver, on behalf of the Master
Servicer, as attorney-in-fact or otherwise, any and all documents and other
instruments, and to do or accomplish all other acts or things necessary or
appropriate to effect the purposes of such notice of termination, whether to
complete the transfer and endorsement or assignment of the Mortgage Loans and
related documents, or otherwise. The Master Servicer agrees to cooperate with
the Trustee in effecting the termination of the Master Servicer's
responsibilities and rights hereunder, including, without limitation, the
transfer to the Trustee for administration by it of all cash amounts which shall
at the time be credited by the Master Servicer to the Certificate Account or
thereafter be received with respect to the Mortgage Loans.

          Notwithstanding the foregoing, if an Event of Default described in
clause (vi) of this Section 7.01(a) shall occur, the Trustee shall, by notice in
writing to the Master Servicer,


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which may be delivered by telecopy, immediately suspend all of the rights and
obligations of the Master Servicer thereafter arising under this Agreement, but
without prejudice to any rights it may have as a Certificateholder or to
reimbursement of Monthly P&I Advances and other advances of its own funds, and
the Trustee shall act as provided in Section 7.02 to carry out the duties of the
Master Servicer, including the obligation to make any Monthly P&I Advance the
nonpayment of which was an Event of Default described in clause (vi) of this
Section 7.01(a). Any such action taken by the Trustee must be prior to the
distribution on the relevant Distribution Date. If the Master Servicer shall
within two Business Days following such suspension remit to the Trustee the
amount of any Monthly P&I Advance the nonpayment of which by the Master Servicer
was an Event of Default described in clause (vi) of this Section 7.01(a), the
Trustee shall permit the Master Servicer to resume its rights and obligations as
Master Servicer hereunder. The Master Servicer agrees that it will reimburse the
Trustee for actual, necessary and reasonable costs incurred by the Trustee
because of action taken pursuant to clause (vi) of this Section 7.01(a). The
Master Servicer agrees that if an Event of Default as described in clause (vi)
of this Section 7.01(a) shall occur more than two times in any twelve month
period, the Trustee shall be under no obligation to permit the Master Servicer
to resume its rights and obligations as Master Servicer hereunder.

     (b)  In case one or more of the following Events of Default by the Company
shall occur and be continuing, that is to say:

          (i)        Failure on the part of the Company duly to observe or
     perform in any material respect any of the covenants or agreements on the
     part of the Company contained in the Certificates or in this Agreement
     which continues unremedied for a period of 60 days after the date on which
     written notice of such failure, requiring the same to be remedied, shall
     have been given to the Company by the Trustee, or to the Company and the
     Trustee by the Holders of Certificates evidencing Percentage Interests
     aggregating not less than 25% of the REMIC II Trust Fund; or

          (ii)      A decree or order of a court or agency or supervisory
     authority having jurisdiction in the premises for the appointment of a
     trustee in bankruptcy, conservator or receiver or liquidator in any
     bankruptcy, insolvency, readjustment of debt, marshalling of assets and
     liabilities or similar proceedings, or for the winding-up or liquidation of
     its affairs, shall have been entered against the Company and such decree or
     order shall have remained in force undischarged or unstayed for a period of
     60 days; or

          (iii)     The Company shall consent to the appointment of a trustee in
     bankruptcy, conservator or receiver or liquidator in any bankruptcy,
     insolvency, readjustment of debt, marshalling of assets and liabilities or
     similar proceedings of or relating to the Company or of or relating to all
     or substantially all of its property; or

          (iv)      The Company shall admit in writing its inability to pay its
     debts generally as they become due, file a petition to take advantage of
     any applicable bankruptcy, insolvency or reorganization statute, make an
     assignment for the benefit of creditors, or voluntarily suspend payment of
     its obligations;


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then, and in each and every such case, so long as such Event of Default shall
not have been remedied, the Holders of Certificates evidencing Percentage
Interests aggregating not less than 25% of the REMIC II Trust Fund, by notice in
writing to the Company and the Trustee, may direct the Trustee in accordance
with Section 10.03 to institute an action, suit or proceeding in its own name as
Trustee hereunder to enforce the Company's obligations hereunder.

     (c)  In any circumstances in which this Agreement states that
Certificateholders owning Certificates evidencing a certain percentage
Percentage Interest in the REMIC II Trust Fund may take certain action, such
action shall be taken by the Trustee, but only if the requisite percentage of
Certificateholders required under this Agreement for taking like action or
giving like instruction to the Trustee under this Agreement shall have so
directed the Trustee in writing.

     Section 7.02.  TRUSTEE TO ACT; APPOINTMENT OF SUCCESSOR. On and after the
time the Master Servicer receives a notice of termination pursuant to Section
7.01, the Trustee shall be the successor in all respects to the Master Servicer
under this Agreement and under the Selling and Servicing Contracts with respect
to the Mortgage Loans in the Mortgage Pool and with respect to the transactions
set forth or provided for herein and shall have all the rights and powers and be
subject to all the responsibilities, duties and liabilities relating thereto
arising after the Master Servicer receives such notice of termination placed on
the Master Servicer by the terms and provisions hereof and thereof, and shall
have the same limitations on liability herein granted to the Master Servicer;
provided, that the Trustee shall not under any circumstances be responsible for
any representations and warranties or any Purchase Obligation of the Company or
any liability incurred by the Master Servicer at or prior to the time the Master
Servicer was terminated as Master Servicer and the Trustee shall not be
obligated to make a Monthly P&I Advance if it is prohibited by law from so
doing. As compensation therefor, the Trustee shall be entitled to all funds
relating to the Mortgage Loans which the Master Servicer would have been
entitled to retain or to withdraw from the Certificate Account if the Master
Servicer had continued to act hereunder, except for those amounts due to the
Master Servicer as reimbursement for advances previously made or amounts
previously expended and are otherwise reimbursable hereunder. Notwithstanding
the above, the Trustee may, if it shall be unwilling to so act, or shall if it
is unable to so act, appoint, or petition a court of competent jurisdiction to
appoint, any established housing and home finance institution having a net worth
of not less than $10,000,000 as the successor to the Master Servicer hereunder
in the assumption of all or any part of the responsibilities, duties or
liabilities of the Master Servicer hereunder. Pending any such appointment, the
Trustee is obligated to act in such capacity. In connection with such
appointment and assumption, the Trustee may make such arrangements for the
compensation of such successor out of payments on Mortgage Loans as it and such
successor shall agree; provided, however, that no such compensation shall,
together with the compensation to the Trustee, be in excess of that permitted
the Master Servicer hereunder. The Trustee and such successor shall take such
actions, consistent with this Agreement, as shall be necessary to effectuate any
such succession.

     Section 7.03.  NOTIFICATION TO CERTIFICATEHOLDERS. Upon any such
termination or appointment of a successor to the Master Servicer, the Trustee
shall give prompt written notice thereof to Certificateholders at their
respective addresses appearing in the Certificate Register.


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                                    ARTICLE VIII


                               CONCERNING THE TRUSTEE

     Section 8.01.  DUTIES OF TRUSTEE.

     (a)  The Trustee, prior to the occurrence of an Event of Default and after
the curing of all Events of Default which may have occurred, undertakes to
perform such duties and only such duties as are specifically set forth in this
Agreement. In case an Event of Default has occurred (which has not been cured or
waived) the Trustee shall exercise such of the rights and powers vested in it by
this Agreement, and use the same degree of care and skill in its exercise as a
prudent person would exercise or use under the circumstances in the conduct of
such person's own affairs.

     (b)  The Trustee, upon receipt of all resolutions, certificates,
statements, opinions, reports, documents, orders or other instruments furnished
to the Trustee which are specifically required to be furnished pursuant to any
provision of this Agreement, shall examine them to determine whether they are in
the form required by this Agreement; provided, however, that the Trustee shall
not be responsible for the accuracy or content of any such certificate,
statement, opinion, report, or other order or instrument furnished by the
Company or Master Servicer to the Trustee pursuant to this Agreement.

     (c)  No provision of this Agreement shall be construed to relieve the
Trustee from liability for its own negligent action, its own negligent failure
to act or its own willful misconduct; provided, however, that:

          (i)       Prior to the occurrence of an Event of Default and after the
     curing of all such Events of Default which may have occurred, the duties
     and obligations of the Trustee shall be determined solely by the express
     provisions of this Agreement, the Trustee shall not be liable except for
     the performance of such duties and obligations as are specifically set
     forth in this Agreement, no implied covenants or obligations shall be read
     into this Agreement against the Trustee, and, in the absence of bad faith
     on the part of the Trustee, the Trustee may conclusively rely, as to the
     truth of the statements and the correctness of the opinions expressed
     therein, upon any certificates or opinions furnished to the Trustee and
     conforming to the requirements of this Agreement; and

          (ii)      The Trustee shall not be personally liable with respect to
     any action taken or omitted to be taken by it in good faith in accordance
     with the direction of the Certificateholders holding Certificates which
     evidence Percentage Interests aggregating not less than 25% of the REMIC II
     Trust Fund relating to the time, method and place of conducting any
     proceeding for any remedy available to the Trustee, or relating to the
     exercise of any trust or power conferred upon the Trustee under this
     Agreement.

     (d)  Within ten days after the occurrence of any Event of Default known to
the Trustee, the Trustee shall transmit by mail to the Rating Agencies notice of
each Event of Default. Within 90 days after the occurrence of any Event of
Default known to the Trustee, the Trustee shall transmit


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<PAGE>

by mail to all Certificateholders (with a copy to the Rating Agencies) notice of
each Event of Default, unless such Event of Default shall have been cured or
waived; provided, however, the Trustee shall be protected in withholding such
notice if and so long as a Responsible Officer of the Trustee in good faith
determines that the withholding of such notice is in the best interests of the
Certificateholders; and provided, further, that in the case of any Event of
Default of the character specified in Section 7.01(i) and Section 7.01(ii) no
such notice to Certificateholders or to the Rating Agencies shall be given until
at least 30 days after the occurrence thereof.

     Section 8.02.  CERTAIN MATTERS AFFECTING THE TRUSTEE. Except as otherwise
provided in Section 8.01:

          (i)       The Trustee may request and rely upon and shall be protected
     in acting or refraining from acting upon any resolution, Officer's
     Certificate, certificate of auditors or any other certificate, statement,
     instrument, opinion, report, notice, request, consent, order, approval,
     bond or other paper or document believed by it to be genuine and to have
     been signed or presented by the proper party or parties;

          (ii)      The Trustee may consult with counsel and any Opinion of
     Counsel shall be full and complete authorization and protection in respect
     of any action taken or suffered or omitted by it hereunder in good faith
     and in accordance with such Opinion of Counsel;

          (iii)     The Trustee shall not be personally liable for any action
     taken or omitted by it in good faith and reasonably believed by it to be
     authorized or within the discretion or rights or powers conferred upon it
     by this Agreement;

          (iv)      Prior to the occurrence of an Event of Default hereunder and
     after the curing of all Events of Default which may have occurred, the
     Trustee shall not be bound to make any investigation into the facts or
     matters stated in any resolution, certificate, statement, instrument,
     opinion, report, notice, request, consent, order, approval, bond or other
     paper or document, unless requested in writing to do so by the Holders of
     Certificates evidencing Percentage Interests aggregating not less than 25%
     of the REMIC II Trust Fund; provided, however, that if the payment within a
     reasonable time to the Trustee of the costs, expenses or liabilities likely
     to be incurred by it in the making of such investigation is, in the opinion
     of the Trustee, not reasonably assured to the Trustee by the security, if
     any, afforded to it by the terms of this Agreement, the Trustee may require
     reasonable indemnity against such expense or liability as a condition to
     proceeding;

          (v)       The Trustee may execute the trust or any of the powers
     hereunder or perform any duties hereunder either directly or by or through
     agents or attorneys; and

          (vi)      The Trustee shall not be deemed to have knowledge or notice
     of any matter, including without limitation an Event of Default, unless
     actually known by a Responsible Officer, or unless written notice thereof
     referencing this Agreement or the Certificates is received at the Corporate
     Trust Office at the address set forth in Section 10.06.


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     Section 8.03.  TRUSTEE NOT LIABLE FOR CERTIFICATES OR MORTGAGE LOANS. The
recitals contained herein (other than those relating to the due organization,
power and authority of the Trustee) and in the Certificates (other than the
execution of, and certificate of authentication on, the Certificates) shall be
taken as the statements of the Company and the Trustee assumes no responsibility
for their correctness. The Trustee makes no representations as to the validity
or sufficiency of this Agreement or of the Certificates or any Mortgage Loan.
The Trustee shall not be accountable for the use or application by the Company
of any of the Certificates or of the proceeds of such Certificates, or for the
use or application of any funds paid to the Master Servicer, the Servicers or
the Company in respect of the Mortgage Loans or deposited into the Custodial
Accounts for P&I, any Buydown Fund Account, or the Custodial Accounts for P&I by
any Servicer or into the Investment Account, or the Certificate Account by the
Master Servicer or the Company.

     Section 8.04.  TRUSTEE MAY OWN CERTIFICATES. The Trustee or any agent or
affiliate of the Trustee, in its individual or any other capacity, may become
the owner or pledgee of Certificates with the same rights it would have if it
were not Trustee.

     Section 8.05.  THE MASTER SERVICER TO PAY TRUSTEE'S FEES AND EXPENSES.
Subject to any separate written agreement with the Trustee, the Master Servicer
covenants and agrees to, and the Master Servicer shall, pay the Trustee from
time to time, and the Trustee shall be entitled to payment, for all services
rendered by it in the execution of the trust hereby created and in the exercise
and performance of any of the powers and duties hereunder of the Trustee. Except
as otherwise expressly provided herein, the Master Servicer shall pay or
reimburse the Trustee upon its request for all reasonable expenses and
disbursements incurred or made by the Trustee in accordance with any of the
provisions of this Agreement and indemnify the Trustee from any loss, liability
or expense incurred by it hereunder (including the reasonable compensation and
the expenses and disbursements of its counsel and of all persons not regularly
in its employ) except any such expense or disbursement as may arise from its
negligence or bad faith. Such obligation shall survive the termination of this
Agreement or resignation or removal of the Trustee. The Company shall, at its
expense, prepare or cause to be prepared all federal and state income tax and
franchise tax and information returns relating to the REMIC I Trust Fund or the
REMIC II Trust Fund required to be prepared or filed by the Trustee and shall
indemnify the Trustee for any liability of the Trustee arising from any error in
such returns.

     Section 8.06.  ELIGIBILITY REQUIREMENTS FOR TRUSTEE. The Trustee hereunder
shall at all times be (i) an institution insured by the FDIC, (ii) a corporation
or association organized and doing business under the laws of the United States
of America or of any state, authorized under such laws to exercise corporate
trust powers, having a combined capital and surplus of not less than $50,000,000
and subject to supervision or examination by federal or state authority and
(iii) acceptable to the Rating Agencies. If such corporation or association
publishes reports of condition at least annually, pursuant to law or to the
requirements of any aforementioned supervising or examining authority, then for
the purposes of this Section 8.06, the combined capital and surplus of such
corporation shall be deemed to be its combined capital and surplus as set forth
in its most recent report of condition so published. In case at any time the
Trustee shall cease to be eligible in accordance with the provisions of this
Section 8.06, the Trustee shall resign immediately in the manner and with the
effect specified in Section 8.07.


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     Section 8.07.  RESIGNATION AND REMOVAL OF TRUSTEE. The Trustee may at any
time resign and be discharged from the trusts hereby created by giving written
notice thereof to the Master Servicer. Upon receiving such notice of
resignation, the Master Servicer shall promptly appoint a successor trustee by
written instrument, in duplicate, one copy of which instrument shall be
delivered to the resigning Trustee and one copy to the successor trustee. If no
successor trustee shall have been so appointed and shall have accepted
appointment within 30 days after the giving of such notice of resignation, the
resigning Trustee may petition any court of competent jurisdiction for the
appointment of a successor trustee.

     If at any time the Trustee shall cease to be eligible in accordance with
the provisions of Section 8.06 and shall fail to resign after written request
therefor by the Master Servicer, or if at any time the Trustee shall become
incapable of acting, or shall be adjudged bankrupt or insolvent, or a receiver
of the Trustee or of its property shall be appointed, or any public officer
shall take charge or control of the Trustee or of its property or affairs for
the purpose of rehabilitation, conservation or liquidation, then the Master
Servicer may remove the Trustee and appoint a successor trustee by written
instrument, in duplicate, one copy of which instrument shall be delivered to the
Trustee so removed, one copy to the successor.

     The Holders of Certificates evidencing Percentage Interests aggregating
more than 50% of the REMIC II Trust Fund may at any time remove the Trustee and
appoint a successor trustee by written instrument or instruments, in triplicate,
signed by such Holders or their attorneys in-fact duly authorized, one complete
set of which instruments shall be delivered to the Master Servicer, one complete
set to the Trustee so removed and one complete set to the successor so
appointed.

     Any resignation or removal of the Trustee and appointment of a successor
trustee pursuant to any of the provisions of this Section 8.07 shall become
effective upon acceptance of appointment by the successor trustee as provided in
Section 8.08. Any expenses associated with the resignation of the Trustee shall
be borne by the Trustee, and any expenses associated with the removal of the
Trustee shall be borne by the Master Servicer.

     Section 8.08.  SUCCESSOR TRUSTEE. Any successor trustee appointed as
provided in Section 8.07 shall execute, acknowledge and deliver to the Master
Servicer and to its predecessor trustee an instrument accepting such appointment
hereunder, and thereupon the resignation or removal of the predecessor trustee
shall become effective and such successor trustee, without any further act, deed
or conveyance, shall become fully vested with all the rights, powers, duties and
obligations of its predecessor hereunder, with like effect as if originally
named as Trustee herein. The predecessor shall deliver to the successor trustee
all Mortgage Files, related documents, statements and all other property held by
it hereunder, and the Master Servicer and the predecessor trustee shall execute
and deliver such instruments and do such other things as may reasonably be
required for more fully and certainly vesting and confirming in the successor
trustee all such rights, powers, duties and obligations.

     No successor trustee shall accept appointment as provided in this Section
8.08 unless at the time of such appointment such successor trustee shall be
eligible under the provisions of Section 8.06.


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     Upon acceptance of appointment by a successor trustee as provided in this
Section 8.08, the Master Servicer shall mail notice of the succession of such
trustee hereunder to (i) all Certificateholders at their addresses as shown in
the Certificate Register and (ii) the Rating Agencies. If the Master Servicer
fails to mail such notice within ten days after acceptance of appointment by the
successor trustee, the successor trustee shall cause such notice to be mailed.

     Section 8.09.  MERGER OR CONSOLIDATION OF TRUSTEE. Any corporation or
association into which the Trustee may be merged or converted or with which it
may be consolidated, or any corporation resulting from any merger, conversion or
consolidation to which the Trustee shall be a party, or any corporation
succeeding to the corporate trust business of the Trustee, shall be the
successor of the Trustee hereunder, provided such resulting or successor
corporation shall be eligible under the provisions of Section 8.06, without the
execution or filing of any paper or any further act on the part of any of the
parties hereto, anything herein to the contrary notwithstanding.

     Section 8.10.  APPOINTMENT OF CO-TRUSTEE OR SEPARATE TRUSTEE.
Notwithstanding any other provisions hereof, at any time, for the purpose of
meeting any legal requirements of any jurisdiction in which any part of the
REMIC I Trust Fund or REMIC II Trust Fund may at the time be located, the Master
Servicer and the Trustee acting jointly shall have the power and shall execute
and deliver all instruments to appoint one or more Persons approved by the
Trustee to act as co-trustee or co-trustees, jointly with the Trustee, or
separate trustee or separate trustees, of all or any part of the REMIC I Trust
Fund or REMIC II Trust Fund and to vest in such Person or Persons, in such
capacity, such title to the REMIC I Trust Fund or REMIC II Trust Fund, or any
part thereof, and, subject to the other provisions of this Section 8.10, such
powers, duties, obligations, rights and trusts as the Master Servicer and the
Trustee may consider necessary or desirable; provided, that the Trustee shall
remain liable for all of its obligations and duties under this Agreement. If the
Master Servicer shall not have joined in such appointment within 15 days after
the receipt by it of a request so to do, or in case an Event of Default shall
have occurred and be continuing, the Trustee alone shall have the power to make
such appointment; provided, that the Trustee shall remain liable for all of its
obligations and duties under this Agreement. No co-trustee or separate trustee
hereunder shall be required to meet the terms of eligibility as a successor
trustee under Section 8.06 hereunder and no notice to Certificateholders of the
appointment of co-trustee(s) or separate trustee(s) shall be required under
Section 8.08 hereof.

     In the case of any appointment of a co-trustee or separate trustee pursuant
to this Section 8.10, all rights, powers, duties and obligations conferred or
imposed upon the Trustee shall be conferred or imposed upon and exercised or
performed by the Trustee and such separate trustee or co-trustee jointly and
severally, except to the extent that under any law of any jurisdiction in which
any particular act or acts are to be performed by the Trustee (whether as
Trustee hereunder or as successor to the Master Servicer hereunder), the Trustee
shall be incompetent or unqualified to perform such act or acts, in which event
such rights, powers, duties and obligations (including the holding of title to
the REMIC I Trust Fund or the REMIC II Trust Fund or any portion thereof in any
such jurisdiction) shall be exercised and performed by such separate trustee or
co-trustee at the direction of the Trustee.


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     Any notice, request or other writing given to the Trustee shall be deemed
to have been given to each of the then separate trustee(s) and co-trustee(s), as
effectively as if given to each of them. Every instrument appointing any
separate trustee(s) or co-trustee(s) shall refer to this Agreement and the
conditions of this Article VIII. Each separate trustee and co-trustee, upon its
acceptance of the trusts conferred, shall be vested with the estates or property
specified in its instrument of appointment, either jointly with the Trustee or
separately, as may be provided therein, subject to all the provisions of this
Agreement, specifically including every provision of this Agreement relating to
the conduct of, affecting the liability of, or affording protection to, the
Trustee. Every such instrument shall be filed with the Trustee.

     Any separate trustee or co-trustee may, at any time, constitute the Trustee
its agent or attorney-in-fact, with full power and authority, to the extent not
prohibited by law, to do any lawful act under or in respect of this Agreement on
its behalf and in its name. If any separate trustee or co-trustee shall die,
become incapable of acting, resign or be removed, all of its estates,
properties, rights, remedies and the trust shall vest in and be exercised by the
Trustee, to the extent permitted by law, without the appointment of a new or
successor trustee.

     Section 8.11.  AUTHENTICATING AGENTS. The Trustee may appoint one or more
Authenticating Agents which shall be authorized to act on behalf of the Trustee
in authenticating Certificates. Wherever reference is made in this Agreement to
the authentication of Certificates by the Trustee or the Trustee's certificate
of authentication, such reference shall be deemed to include authentication on
behalf of the Trustee by an Authenticating Agent and a certificate of
authentication executed on behalf of the Trustee by an Authenticating Agent.
Each Authenticating Agent must be acceptable to the Master Servicer and must be
a corporation or banking association organized and doing business under the laws
of the United States of America or of any state, having a principal office and
place of business in New York, New York, having a combined capital and surplus
of at least $15,000,000, authorized under such laws to do a trust business and
subject to supervision or examination by federal or state authorities.

     Any corporation into which any Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which any Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency business
of any Authenticating Agent, shall continue to be the Authenticating Agent so
long as it shall be eligible in accordance with the provisions of the first
paragraph of this Section 8.11 without the execution or filing of any paper or
any further act on the part of the Trustee or the Authenticating Agent.

     Any Authenticating Agent may at any time resign by giving written notice of
resignation to the Trustee and to the Master Servicer. The Trustee may, upon
prior written approval of the Master Servicer, at any time terminate the agency
of any Authenticating Agent by giving written notice of termination to such
Authenticating Agent and to the Master Servicer. Upon receiving a notice of
resignation or upon such a termination, or in case at any time any
Authenticating Agent shall cease to be eligible in accordance with the
provisions of the first paragraph of this Section 8.11, the Trustee may appoint,
upon prior written approval of the Master Servicer, a successor Authenticating
Agent, shall give written notice of such appointment to the Master Servicer and
shall mail notice of such appointment to all Certificateholders. Any successor
Authenticating


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Agent upon acceptance of its appointment hereunder shall become vested with all
the rights, powers, duties and responsibilities of its predecessor hereunder,
with like effect as if originally named as Authenticating Agent. Any reasonable
compensation paid to an Authenticating Agent shall be a reimbursable expense
pursuant to Section 8.05 if paid by the Trustee.

     Section 8.12.  PAYING AGENTS. The Trustee may appoint one or more Paying
Agents which shall be authorized to act on behalf of the Trustee in making
withdrawals from the Certificate Account, and distributions to
Certificateholders as provided in Section 4.01 and Section 4.04(a) and Section
9.01(b) to the extent directed to do so by the Master Servicer. Wherever
reference is made in this Agreement to the withdrawal from the Certificate
Account by the Trustee, such reference shall be deemed to include such a
withdrawal on behalf of the Trustee by a Paying Agent. Whenever reference is
made in this Agreement to a distribution by the Trustee or the furnishing of a
statement to Certificateholders by the Trustee, such reference shall be deemed
to include such a distribution or furnishing on behalf of the Trustee by a
Paying Agent. Each Paying Agent shall provide to the Trustee such information
concerning the Certificate Account as the Trustee shall request from time to
time. Each Paying Agent must be reasonably acceptable to the Master Servicer and
must be a corporation or banking association organized and doing business under
the laws of the United States of America or of any state, having a principal
office and place of business in New York, New York, having a combined capital
and surplus of at least $15,000,000, authorized under such laws to do a trust
business and subject to supervision or examination by federal or state
authorities.

     Any corporation into which any Paying Agent may be merged or converted or
with which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which any Paying Agent shall be a party, or any
corporation succeeding to the corporate agency business of any Paying Agent,
shall continue to be the Paying Agent provided that such corporation after the
consummation of such merger, conversion, consolidation or succession meets the
eligibility requirements of this Section 8.12.

     Any Paying Agent may at any time resign by giving written notice of
resignation to the Trustee and to the Master Servicer; provided, that the Paying
Agent has returned to the Certificate Account or otherwise accounted, to the
reasonable satisfaction of the Master Servicer, for all amounts it has withdrawn
from the Certificate Account. The Trustee may, upon prior written approval of
the Master Servicer, at any time terminate the agency of any Paying Agent by
giving written notice of termination to such Paying Agent and to the Master
Servicer. Upon receiving a notice of resignation or upon such a termination, or
in case at any time any Paying Agent shall cease to be eligible in accordance
with the provisions of the first paragraph of this Section 8.12, the Trustee may
appoint, upon prior written approval of the Master Servicer, a successor Paying
Agent, shall give written notice of such appointment to the Master Servicer and
shall mail notice of such appointment to all Certificateholders. Any successor
Paying Agent upon acceptance of its appointment hereunder shall become vested
with all the rights, powers, duties and responsibilities of its predecessor
hereunder, with like effect as if originally named as Paying Agent. Any
reasonable compensation paid to any Paying Agent shall be a reimbursable expense
pursuant to Section 8.05 if paid by the Trustee.


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                                     ARTICLE IX


                                    TERMINATION

     Section 9.01.  TERMINATION UPON REPURCHASE BY THE COMPANY OR LIQUIDATION OF
ALL MORTGAGE LOANS.

     (a)  Except as otherwise set forth in this Article IX, including, without
limitation, the obligation of the Master Servicer to make payments to
Certificateholders as hereafter set forth, the respective obligations and
responsibilities of the Company, the Master Servicer and the Trustee created
hereby shall terminate upon (i) the repurchase by the Company pursuant to the
following paragraph of this Section 9.01(a) of all Mortgage Loans and all
property acquired in respect of any Mortgage Loan remaining in the REMIC I Trust
Fund at a price equal, after the deduction of related advances, to the sum of
(x) the excess of (A) 100% of the aggregate outstanding Principal Balance of
such Mortgage Loans (other than Liquidated Mortgage Loans) plus accrued interest
at the applicable Pass-Through Rate with respect to such Mortgage Loan (other
than a Liquidated Mortgage Loan) through the last day of the month of such
repurchase, over (B) with respect to any Mortgage Loan which is not a Liquidated
Mortgage Loan, the amount of the Bankruptcy Loss incurred with respect to such
Mortgage Loan as of the date of such repurchase by the Company to the extent
that the Principal Balance of such Mortgage Loan has not been previously reduced
by such Bankruptcy Loss, and (y) the appraised fair market value as of the
effective date of the termination of the trust created hereby of (A) all
property in the REMIC I Trust Fund which secured a Mortgage Loan and which was
acquired by foreclosure or deed in lieu of foreclosure after the Cut-Off Date,
including related Insurance Proceeds, and (B) all other property in the REMIC I
Trust Fund, any such appraisal to be conducted by an appraiser mutually agreed
upon by the Company and the Trustee, or (ii) the later of the final payment or
other liquidation (or any advance with respect thereto) of the last Mortgage
Loan remaining in the REMIC I Trust Fund or the disposition of all property
acquired upon foreclosure in respect of any Mortgage Loan, and the payment to
Certificateholders of all amounts required to be paid to them hereunder;
provided, however, that in no event shall the trusts created hereby continue
beyond the expiration of 21 years from the death of the survivor of the issue of
Joseph P. Kennedy, the late ambassador of the United States to the Court of St.
James, living on the date hereof.

     The Company may repurchase the outstanding Mortgage Loans and any Mortgaged
Properties acquired by the REMIC I Trust Fund at the price stated in clause (i)
of the preceding paragraph provided that the aggregate Principal Balance of the
Mortgage Loans at the time of any such repurchase aggregates less than five
percent of the aggregate Principal Balance of the Mortgage Loans as of the
Cut-Off Date. If such right is exercised, the Company shall provide to the
Trustee (and to the Master Servicer, if the Company is no longer acting as
Master Servicer) the written certification of an officer of the Company (which
certification shall include a statement to the effect that all amounts required
to be paid in order to repurchase the Mortgage Loans have been deposited in the
Certificate Account) and the Trustee shall promptly execute all instruments as
may be necessary to release and assign to the Company the Mortgage Files and any
foreclosed Mortgaged Property pertaining to the REMIC I Trust Fund.


                                         143
<PAGE>

     In no event shall the Company be required to expend any amounts other than
those described in the first paragraph of this Section 9.01(a) in order to
terminate the REMIC I Trust Fund or repurchase the Mortgage Loans under this
Section 9.01.

     (b)  Notice of any termination, specifying the date upon which the
Certificateholders may surrender their Certificates to the Trustee for payment
and cancellation, shall be given promptly by letter from the Trustee to
Certificateholders mailed not less than 30 days prior to such final
distribution, specifying (i) the date upon which final payment of the
Certificates will be made upon presentation and surrender of Certificates at the
office of the Certificate Registrar therein designated (the "Termination Date"),
(ii) the amount of such final payment (the "Termination Payment") and (iii) that
the Record Date otherwise applicable to the Distribution Date upon which the
Termination Date occurs is not applicable, payments being made only upon
presentation and surrender of the Certificates at the office of the Certificate
Registrar therein specified. Upon any such notice, the Certificate Account shall
terminate subject to the Master Servicer's obligation to hold all amounts
payable to Certificateholders in trust without interest pending such payment.

     In the event that all of the Certificateholders shall not surrender their
Certificates for cancellation within six months after the Termination Date, the
Company shall give a second written notice to the remaining Certificateholders
to surrender their Certificates for cancellation and receive the Termination
Payment with respect thereto. If within one year after the second notice all the
Certificates shall not have been surrendered for cancellation, the Company may
take appropriate steps to contact the remaining Certificateholders concerning
surrender of their Certificates, and the cost thereof shall be paid out of the
funds and other assets which remain in trust hereunder.

     Section 9.02.  ADDITIONAL TERMINATION REQUIREMENTS.

     (a)  In the event the Company exercises its purchase option as provided in
Section 9.01, the REMIC I Trust Fund and the REMIC II Trust Fund shall be
terminated in accordance with the following additional requirements, unless the
Company, at its own expense, obtains for the Trustee an Opinion of Counsel to
the effect that the failure of the REMIC I Trust Fund and REMIC II Trust Fund to
comply with the requirements of this Section 9.02 will not (i) result in the
imposition of taxes on "prohibited transactions" of the REMIC I Trust Fund and
the REMIC II Trust Fund as described in Section 860F of the Code, or (ii) cause
the REMIC I Trust Fund or the REMIC II Trust Fund to fail to qualify as a REMIC
at any time that any Certificates are outstanding:

          (i)       Within 90 days prior to the final Distribution Date set
     forth in the notice given by the Trustee under Section 9.01, the Company,
     in its capacity as agent of the Tax Matters Person shall prepare the
     documentation required and adopt a plan of complete liquidation on behalf
     of the REMIC I Trust Fund and the REMIC II Trust Fund meeting the
     requirements of a qualified liquidation under Section 860F of the Code and
     any regulations thereunder, as evidenced by an Opinion of Counsel obtained
     at the expense of the Company, on behalf of the REMIC I Trust Fund and the
     REMIC II Trust Fund; and


                                         144
<PAGE>

          (ii)      At or after the time of adoption of such a plan of complete
     liquidation and at or prior to the final Distribution Date, the Master
     Servicer as agent of the Trustee shall sell all of the assets of the REMIC
     I Trust Fund and the REMIC II Trust Fund to the Company for cash in the
     amount specified in Section 9.01.

     (b)  By its acceptance of any Residual Certificate, the Holder thereof
hereby agrees to authorize the Company to adopt such a plan of complete
liquidation upon the written request of the Company and to take such other
action in connection therewith as may be reasonably requested by the Company.

     Section 9.03.  TRUSTS IRREVOCABLE. Except as expressly provided herein, the
trusts created hereby are irrevocable.


                                         145
<PAGE>

                                      ARTICLE X


                              MISCELLANEOUS PROVISIONS

     Section 10.01. AMENDMENT.

     (a)  This Agreement may be amended from time to time by the Master
Servicer, the Company and the Trustee, without the consent of any of the
Certificateholders, (i) to cure any ambiguity; (ii) to correct or supplement any
provision herein which may be defective or inconsistent with any other
provisions herein; (iii) to comply with any requirements imposed by the Code or
any regulations thereunder; (iv) to correct the description of any property at
any time included in the REMIC I Trust Fund or the REMIC II Trust Fund, or to
assure the conveyance to the Trustee of any property included in the REMIC I
Trust Fund or the REMIC II Trust Fund; and (v) pursuant to Section 5.01(c)(v).
No such amendment (other than one entered into pursuant to clause (iii) of the
preceding sentence) shall adversely affect in any material respect the interest
of any Certificateholder. Prior to entering into any amendment without the
consent of Certificateholders pursuant to this paragraph, the Trustee may
require an Opinion of Counsel to the effect that such amendment is permitted
under this paragraph. The placement of an "original issue discount" legend on,
or any change required to correct any such legend previously place on, a
Certificate shall not be deemed any amendment to this Agreement.

     (b)  This Agreement may also be amended from time to time by the Master
Servicer, the Company and the Trustee with the consent of the Holders of
Certificates evidencing Percentage Interests aggregating not less than 66% of
the REMIC II Trust Fund for the purpose of adding any provisions to, or changing
in any manner or eliminating any of the provisions of, this Agreement or of
modifying in any manner the rights of the Certificateholders; provided, however,
that no such amendment shall, without the consent of the Holder of each
Certificate affected thereby (i) reduce in any manner the amount of, or delay
the timing of, distributions of principal or interest required to be made
hereunder or reduce the Certificateholder's Percentage Interest, the Remittance
Rate or the Termination Payment with respect to any of the Certificates, (ii)
reduce the percentage of Percentage Interests specified in this Section 10.01
which are required to amend this Agreement, (iii) create or permit the creation
of any lien against any part of the REMIC I Trust Fund or the REMIC II Trust
Fund, or (iv) modify any provision in any way which would permit an earlier
retirement of the Certificates.

     Promptly after the execution of any such amendment, the Trustee shall
furnish written notification of the substance of such amendment to each
Certificateholder. Any failure to provide such notice, or any defect therein,
shall not, however, in any way impair or affect the validity of any such
amendment.

     It shall not be necessary for the consent of Certificateholders under this
Section 10.01 to approve the particular form of any proposed amendment, but it
shall be sufficient if such consent shall approve the substance thereof. The
manner of obtaining such consents and of evidencing the


                                         146
<PAGE>

authorization of the execution thereof by Certificateholders shall be subject to
such reasonable regulations as the Trustee may prescribe.

     Section 10.02. RECORDATION OF AGREEMENT. To the extent permitted by
applicable law, this Agreement is subject to recordation in all appropriate
public offices for real property records in all the counties or the comparable
jurisdictions in which any Mortgaged Property is situated, and in any other
appropriate public recording office or elsewhere, such recordation to be
effected by the Company and at its expense on direction by the Trustee, but only
upon direction accompanied by an Opinion of Counsel to the effect that such
recordation materially and beneficially affects the interests of the
Certificateholders.

     Section 10.03. LIMITATION ON RIGHTS OF CERTIFICATEHOLDERS. The death or
incapacity of any Certificateholder shall not operate to terminate this
Agreement, the REMIC I Trust Fund or REMIC II Trust Fund, nor entitle such
Certificateholder's legal representatives or heirs to claim an accounting or to
take any action or proceeding in any court for a partition or winding-up of the
REMIC I Trust Fund or the REMIC II Trust Fund, nor otherwise affect the rights,
obligations and liabilities of the parties hereto or any of them.

     No Certificateholder shall have any right to vote or in any manner
otherwise to control the operation and management of the REMIC I Trust Fund or
the REMIC II Trust Fund or the obligations of the parties hereto (except as
provided in Section 5.09, Section 7.01, Section 8.01, Section 8.02, Section
8.07, Section 10.01 and this Section 10.03), nor shall anything herein set
forth, or contained in the terms of the Certificates, be construed so as to
constitute the Certificateholders from time to time as partners or members of an
association; nor shall any Certificateholder be under any liability to any third
person by reason of any action taken by the parties to this Agreement pursuant
to any provision hereof.

     No Certificateholder shall have any right by virtue or by availing of any
provision of this Agreement to institute any suit, action or proceeding in
equity or at law upon or under or with respect to this Agreement, unless such
Holder previously shall have given to the Trustee a written notice of default
and of the continuance thereof, as hereinbefore provided, and unless also the
Holders of Certificates evidencing Percentage Interests aggregating not less
than 25% of the REMIC II Trust Fund shall have made written request upon the
Trustee to institute such action, suit or proceeding in its own name as Trustee
hereunder and shall have offered to the Trustee such reasonable indemnity as it
may require against the costs, expenses and liabilities to be incurred therein
or thereby, and the Trustee, for 60 days after its receipt of such notice,
request and offer of indemnity, shall have neglected or refused to institute any
such action, suit or proceeding. However, the Trustee is under no obligation to
exercise any of the extraordinary trusts or powers vested in it by this
Agreement or to make any investigation of matters arising hereunder or to
institute, conduct or defend any litigation hereunder or in relation hereto at
the request, order or direction of any of the Certificateholders unless such
Certificateholders have offered to the Trustee reasonable security or indemnity
against the costs, expenses and liabilities which may be incurred therein or
thereby. It is understood and intended, and expressly covenanted by each
Certificateholder with every other Certificateholder and the Trustee, that no
one or more Holders of Certificates shall have any right in any manner whatever
by virtue or by availing of any provision of this Agreement to affect, disturb
or prejudice the rights of the Holders


                                         147
<PAGE>

of any other of such Certificates, or to obtain or seek to obtain priority over
or preference to any other such Holder, or to enforce any right under this
Agreement, except in the manner herein provided and for the equal, ratable and
common benefit of all Certificateholders. For the protection and enforcement of
the provisions of this Section 10.03, each and every Certificateholder and the
Trustee shall be entitled to such relief as can be given either at law or in
equity.

     Section 10.04. ACCESS TO LIST OF CERTIFICATEHOLDERS. The Certificate
Registrar shall furnish or cause to be furnished to the Trustee, within 30 days
after receipt of a request by the Trustee in writing, a list, in such form as
the Trustee may reasonably require, of the names and addresses of the
Certificateholders as of the most recent Record Date for payment of
distributions to such Certificateholders.

     If three or more Certificateholders (hereinafter referred to as
"applicants") apply in writing to the Trustee, and such application states that
the applicants desire to communicate with other Certificateholders with respect
to their rights under this Agreement or under the Certificates and is
accompanied by a copy of the communication which such applicants propose to
transmit, then the Trustee shall, within five Business Days after the receipt of
such list from the Certificate Registrar, afford such applicants access during
normal business hours to the most recent list of Certificateholders held by the
Trustee. If such a list is as of a date more than 90 days prior to the date of
receipt of such applicants' request, the Trustee shall promptly request from the
Certificate Registrar a current list as provided above, and shall afford such
applicants access to such list promptly upon receipt.

     Every Certificateholder, by receiving and holding the same, agrees with the
Master Servicer and the Trustee that neither the Master Servicer nor the Trustee
shall be held accountable by reason of the disclosure of any such information as
to the names and addresses of the Certificateholders hereunder, regardless of
the source from which such information was derived.

     Section 10.05. GOVERNING LAW. This Agreement shall be construed in
accordance with the laws of the State of New York and the obligations, rights
and remedies of the parties hereunder shall be determined in accordance with
such laws.

     Section 10.06. NOTICES. All demands, notices and communications hereunder
shall be in writing and shall be deemed to have been duly given if personally
delivered at or mailed by registered or certified mail to (a) in the case of the
Company, 75 North Fairway Drive, Vernon Hills, Illinois 60061, Attention:
General Counsel (with a copy directed to the attention of the Master Servicing
Department) or such other address as may hereafter be furnished to the Trustee
in writing by the Company, (b) in the case of the Trustee, at its Corporate
Trust Office, or such other address as may hereafter be furnished to the Master
Servicer in writing by the Trustee, (c) in the case of the Certificate
Registrar, at its Corporate Trust Office, or such other address as may hereafter
be furnished to the Trustee in writing by the Certificate Registrar, (d) in the
case of S&P, 26 Broadway, 15th Floor, New York, New York 10004, Attention:
Frank Raiter, or such other address as may hereafter be furnished to the Trustee
and Master Servicer in writing by S&P and (e) in the case of Fitch, One State
State Street Plaza, New York, New York 10004,


                                         148
<PAGE>

Attention: George Massim, or such other address as may hereafter be furnished to
the Trustee and Master Servicer in writing by Fitch. Notices to the Rating
Agencies shall also be deemed to have been duly given if mailed by first class
mail, postage prepaid, to the above listed addresses of the Rating Agencies. Any
notice required or permitted to be mailed to a Certificateholder shall be given
by first class mail, postage prepaid, at the address of such Holder as shown in
the Certificate Register. Any notice so mailed within the time prescribed in
this Agreement shall be conclusively presumed to have been duly given, whether
or not the Certificateholder receives such notice.

     Section 10.07. SEVERABILITY OF PROVISIONS. If any one or more of the
covenants, agreements, provisions or terms of this Agreement shall be for any
reason whatsoever held invalid, then such covenants, agreements, provisions or
terms shall be deemed severable from the remaining covenants, agreements,
provisions or terms of this Agreement and shall in no way affect the validity or
enforceability of the other provisions of this Agreement or of the Certificates
or the rights of the Holders thereof.

     Section 10.08. COUNTERPART SIGNATURES. For the purpose of facilitating the
recordation of this Agreement as herein provided and for other purposes, this
Agreement may be executed simultaneously in any number of counterparts, each of
which counterparts shall be deemed to be an original, and such counterparts
shall constitute but one and the same instrument.

     Section 10.09. BENEFITS OF AGREEMENT. Nothing in this Agreement or in any
Certificate, expressed or implied, shall give to any Person, other than the
parties hereto and their respective successors hereunder, any separate trustee
or co-trustee appointed under Section 8.10 and the Certificateholders, any
benefit or any legal or equitable right, remedy or claim under this Agreement.

     Section 10.10. NOTICES AND COPIES TO RATING AGENCIES.

     (a)  The Trustee shall notify the Rating Agencies of the occurrence of any
of the following events, in the manner provided in Section 10.06:

          (i)       the occurrence of an Event of Default pursuant to Section
     7.01, subject to the provisions of Section 8.01(d);

          (ii)      the appointment of a successor Master Servicer pursuant to
     Section 7.02;

     (b)  The Master Servicer shall notify the Rating Agencies of the occurrence
of any of the following events, or in the case of clauses (iii), (iv), (vii) and
(viii) promptly upon receiving notice thereof, in the manner provided in Section
10.06:

          (i)       any amendment of this Agreement pursuant to Section 10.01;

          (ii)      the appointment of a successor Trustee pursuant to Section
     8.08;

          (iii)     the filing of any claim under or the cancellation or
     modification of any fidelity bond and errors and omissions coverage
     pursuant to Section 3.01 and Section 3.06 with respect to the Master
     Servicer or any Servicer;


                                         149
<PAGE>

          (iv)      any change in the location of the Certificate Account, any
     Custodial Account for P&I or any Custodial Account for Reserves;

          (v)       the repurchase of any Mortgage Loan pursuant to a Purchase
     Obligation or the repurchase of the outstanding Mortgage Loans pursuant to
     Section 9.01;

          (vi)      the occurrence of the final Distribution Date or the
     termination of the trust pursuant to Section 9.01(a)(ii);

          (vii)     the failure of the Master Servicer to make a Monthly P&I
     Advance following a determination on the Determination Date that the Master
     Servicer would make such advance pursuant to Section 4.02; and

          (viii)    the failure of the Master Servicer to make a determination
     on the Determination Date regarding whether it would make a Monthly P&I
     Advance when a shortfall exists between (x) payments scheduled to be
     received in respect of the Mortgage Loans and (y) the amounts actually
     deposited in the Certificate Account on account of such payments, pursuant
     to Section 4.02.

     The Master Servicer shall provide copies of the statements pursuant to
Section 4.02, Section 4.05, Section 3.12, Section 3.13 or Section 3.15 or any
other statements or reports to the Rating Agencies in such time and manner that
such statements or determinations are required to be provided to
Certificateholders. With respect to the reports described in the second
paragraph of Section 4.05, the Master Servicer shall provide such reports to the
Rating Agencies in respect of each Distribution Date, without regard to whether
any Certificateholder or the Trustee has requested such report for such
Distribution Date.


                                         150
<PAGE>

     IN WITNESS WHEREOF, the Company and the Trustee have caused their names to
be signed hereto by their respective officers, thereunto duly authorized, and
their respective seals, duly attested, to be hereunto affixed, all as of the day
and year first above written.

                                   PNC MORTGAGE SECURITIES CORP.

(SEAL)

                                   By:  /s/ Michael A. Aaknes
                                        ------------------------------
                                        Michael A. Aaknes
                                   Its: Assistant Vice President


                                   U.S. BANK NATIONAL ASSOCIATION, as TRUSTEE

(SEAL)

                                   By:  /s/ C. Hatfield
                                        ------------------------------
                                   Its: C. Hatfield     Vice President
                                        ------------------------------


<PAGE>

                           ACKNOWLEDGEMENT OF CORPORATION



STATE OF ILLINOIS        )
                         ) SS.
COUNTY OF LAKE           )

     On this 29th day of April, 1998 before me, a Notary Public in and for said
State, personally appeared Michael A. Aaknes, known to me to be the Assistant
Vice President of PNC MORTGAGE SECURITIES CORP., one of the corporations that
executed the within interest, and also known to me to be the person who executed
it on behalf of said Corporation, and acknowledged to me that such corporation
executed the within instrument pursuant to its By-Laws or a resolution of its
Board of Directors.

     IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official
seal the day and year in the certificate first above written.

                                        /s/ Danielle Berkemeier
                                        -----------------------------
                                        Notary Public



(SEAL)

<PAGE>

                           CERTIFICATE OF ACKNOWLEDGEMENT

STATE OF MINNESOTA       )
                         ) SS.
COUNTY OF RAMSEY         )

     On this 29th day of April, 1998 before me, a Notary Public in and for said
State, personally appeared C. Hatfield, personally known to me (or proved to me
on the basis of satisfactory evidence) to be the person(s) whose name(s) is/are
subscribed to the within instrument and acknowledged to me that he/she/they
executed the same in his/her/their authorized capacity(ies), and that by
his/her/their signature(s) on the instrument the person(s), or the entity upon
behalf of which the person(s) acted, executed the instrument.

     WITNESS my hand and official seal.

     Signature  /s/ Deborah J. Franco   (SEAL)
               -------------------------


<PAGE>

                                                              Exhibit A-I-A-1
                                                              CUSIP [          ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                    Class I-A-1

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
7.000% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (i.e., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ _________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ____%, and the amount of OID
attributable to the short period is not more than $ __________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class I-A-1 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------


Class I-A-1 Remittance Rate:   7.000%

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class I-A-1 Principal Balance
as of the Cut-Off Date:   $[          ]



                                     Cede & Co.
                                  Registered Owner


                                         A-1
<PAGE>


                                                                   Exhibit A-I-X
                                                                   CUSIP

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                     Class I-X

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
7.000% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (I.E., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is ____ %, and the amount
of OID attributable to the short period is not more than $ __________  per
$100,000 of initial Certificate Principal Balance, computed under the exact
method. No representation is made that the Mortgage Loans will prepay at a rate
based on the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class I-X Notional Amount
                                        as of the Cut-Off Date Evidenced by this
                                        Certificate:
                                        $
                                         ---------------------------------------


Class I-X Remittance Rate:  7.000%
applied to the Class I-X Notional
Amount

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class I-X Principal Balance
as of the Cut-Off Date:   $0.00

Class I-X Notional Amount
as of the Cut-Off Date:  $[       ]



                                     Cede & Co.
                                  Registered Owner

                                         A-2
<PAGE>

                                                                   Exhibit A-I-P
                                                                   CUSIP

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                     Class I-P

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. Interest is not
payable with respect to this Certificate. [Assuming that the Mortgage Loans
underlying the Certificates prepay at the prepayment assumption used by the
issuer in pricing this Certificate (I.E., 250% of the Standard Prepayment
Assumption as described in the Prospectus Supplement), this Certificate has been
issued with original issue discount ("OID") of no more than $ __________ per
$100,000 of initial Certificate Principal Balance, the yield to maturity is
____ %, and the amount of OID attributable to the short period is not more than
$ __________ per $100,000 of initial Certificate Principal Balance, computed
under the exact method. No representation is made that the Mortgage Loans will
prepay at a rate based on the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class I-P Principal
                                        Balance as of the Cut-Off Date evidenced
                                        by this Certificate:
Class I-P Remittance Rate: 0.00%        $
                                         ----------------------------------
Cut-Off Date: April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class I-P Principal Balance as of the Cut-Off Date:


                                     Cede & Co.
                                  Registered Owner


                                         A-3
<PAGE>

                                                                Exhibit A-II-A-1
                                                                CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                    Class II-A-1

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998.

[Assuming that the Mortgage Loans underlying the Certificates prepay at the
prepayment assumption used by the issuer in pricing this Certificate (I.E., 250%
of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $ _________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ____%, and the amount of OID
attributable to the short period is not more than $ _________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class II-A-1 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class II-A-1 Remittance Rate: Variable

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class II-A-1 Principal Balance as of the Cut-Off Date:


                                     Cede & Co.
                                  Registered Owner


                                         A-4
<PAGE>

                                                                  Exhibit A-II-X
                                                                  CUSIP

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                     Class II-X

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (I.E., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is ____%, and the amount of
OID attributable to the short period is not more than $ _________ per $100,000
of initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class II-X Notional
                                        Amount as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class II-X Remittance Rate: 6.750% applied to the Class II-X Notional Amount

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class II-X Principal Balance as of the Cut-Off Date:   $0.00

Class II-X Notional Amount as of the Cut-Off Date:   $[      ]



                                     Cede & Co.
                                  Registered Owner


                                         A-5
<PAGE>

                                                                  Exhibit A-II-P
                                                                  CUSIP

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                     Class II-P

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. Interest is not
payable with respect to this Certificate. [Assuming that the Mortgage Loans
underlying the Certificates prepay at the prepayment assumption used by the
issuer in pricing this Certificate (I.E., 250% of the Standard Prepayment
Assumption as described in the Prospectus Supplement), this Certificate has been
issued with original issue discount ("OID") of no more than $ ___________ per
$100,000 of initial Certificate Principal Balance, the yield to maturity is
____%, and the amount of OID attributable to the short period is not more than
$ _________ per $100,000 of initial Certificate Principal Balance, computed
under the exact method. No representation is made that the Mortgage Loans will
prepay at a rate based on the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class II-P Principal
                                        Balance as of the Cut-Off Date evidenced
                                        by this Certificate:
Class II-P Remittance Rate: 0.00%       $
                                         ---------------------------------------
Cut-Off Date: April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class II-P Principal Balance as of the Cut-Off Date:


                                     Cede & Co.
                                  Registered Owner


                                         A-6
<PAGE>

                                                               Exhibit A-III-A-1
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-1

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (i.e., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is ____%, and the amount of
OID attributable to the short period is not more than $ __________ per $100,000
of initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-1 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-1 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-1 Principal Balance as of the Cut-Off Date:  $[        ]



                                     Cede & Co.
                                  Registered Owner


                                         A-7
<PAGE>

                                                               Exhibit A-III-A-2
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-2

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998.

[Assuming that the Mortgage Loans underlying the Certificates prepay at the
prepayment assumption used by the issuer in pricing this Certificate (I.E., 250%
of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $ __________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ____%, and the amount of OID
attributable to the short period is not more than $ _________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.


Series 1998-4                           Portion of the Class III-A-2 Notional
                                        Amount as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-2 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-2 Principal Balance as
of the Cut-Off Date: [             ]



                                     Cede & Co.
                                  Registered Owner


                                         A-8
<PAGE>

                                                               Exhibit A-III-A-3
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-3

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (i.e., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is ____%, and the amount of
OID attributable to the short period is not more than $ __________ per $100,000
of initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-3 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-3 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-3 Principal Balance
as of the Cut-Off Date:  $[        ]



                                     Cede & Co.
                                  Registered Owner


                                         A-9
<PAGE>

                                                               Exhibit A-III-A-4
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-4

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$ _________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $ __________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Series 1998-4                           Portion of the Class III-A-4 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-4 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-4 Principal Balance
as of the Cut-Off Date:  $[          ]



                                     Cede & Co.
                                  Registered Owner


                                         A-10
<PAGE>

                                                               Exhibit A-III-A-5
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-5

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (i.e., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ _________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ____%, and the amount of OID
attributable to the short period is not more than $ _________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-5 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-5 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-5 Principal Balance
as of the Cut-Off Date:  $[        ]




                                     Cede & Co.
                                  Registered Owner


                                         A-11
<PAGE>

                                                               Exhibit A-III-A-6
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-6

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (i.e., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is ____%, and the amount of
OID attributable to the short period is not more than $ __________ per $100,000
of initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-6 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-6 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-6 Principal Balance

as of the Cut-Off Date:  $[       ]



                                     Cede & Co.
                                  Registered Owner


                                         A-12
<PAGE>

                                                               Exhibit A-III-A-7
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-7

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (i.e., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ ___________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is ____%, and the amount of
OID attributable to the short period is not more than $ __________ per $100,000
of initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-7 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-7 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-7 Principal Balance
as of the Cut-Off Date:   $[       ]



                                     Cede & Co.
                                  Registered Owner


                                         A-13
<PAGE>

                                                               Exhibit A-III-A-8
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-8

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (i.e., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is ____%, and the amount of
OID attributable to the short period is not more than $ ___________ per $100,000
of initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-8 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-8 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-8 Principal Balance
as of the Cut-Off Date:  $[        ]



                                     Cede & Co.
                                  Registered Owner


                                         A-14
<PAGE>

                                                               Exhibit A-III-A-9
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-9

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
7.000% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (i.e., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is ____%, and the amount of
OID attributable to the short period is not more than $ __________ per $100,000
of initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-9 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------
Class III-A-9 Remittance Rate: 7.000%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-9 Principal Balance
as of the Cut-Off Date:   $[        ]



                                     Cede & Co.
                                  Registered Owner


                                         A-15
<PAGE>

                                                              Exhibit A-III-A-10
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-10

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998.  Interest is not
payable with respect to this Certificate. [Assuming that the Mortgage Loans
underlying the Certificates prepay at the prepayment assumption used by the
issuer in pricing this Certificate (i.e., 250% of the Standard Prepayment
Assumption as described in the Prospectus Supplement), this Certificate has been
issued with original issue discount ("OID") of no more than $ __________ per
$100,000 of initial Certificate Principal Balance, the yield to maturity is
____%, and the amount of OID attributable to the short period is not more than $
__________ per $100,000 of initial Certificate Principal Balance, computed under
the exact method. No representation is made that the Mortgage Loans will prepay
at a rate based on the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-10 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-10 Remittance Rate: 0.000%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-10 Principal Balance
as of the Cut-Off Date:   $[       ]



                                     Cede & Co.
                                  Registered Owner


                                         A-16
<PAGE>

                                                              Exhibit A-III-A-11
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-11

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$___________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $ __________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-11 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-11 Remittance Rate: 6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class III-A-11 Principal Balance
as of the Cut-Off Date:  $[        ]



                                     Cede & Co.
                                  Registered Owner



                                         A-17
<PAGE>

                                                              Exhibit A-III-A-12
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-12

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$ __________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $__________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-12 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-12 Remittance Rate:
6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-A-12 Principal Balance
as of the Cut-Off Date:  $[        ]



                                     Cede & Co.
                                  Registered Owner


                                         A-18
<PAGE>

                                                              Exhibit A-III-A-13
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-13

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$ __________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $ __________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-13 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-13 Remittance Rate:
6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-A-13 Principal Balance
as of the Cut-Off Date:  $[        ]



                                     Cede & Co.
                                  Registered Owner


                                         A-19
<PAGE>

                                                              Exhibit A-III-A-14
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-14

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$ __________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $ __________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-14 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-14 Remittance Rate:
6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-A-14 Principal Balance
as of the Cut-Off Date:  $[        ]



                                     Cede & Co.
                                  Registered Owner


                                         A-20
<PAGE>

                                                              Exhibit A-III-A-15
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-15

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$ __________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $ __________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-15 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-15 Remittance Rate:
7.250%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-A-15 Principal Balance
as of the Cut-Off Date:  $[         ]



                                     Cede & Co.
                                  Registered Owner


                                         A-21
<PAGE>

                                                              Exhibit A-III-A-16
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-16

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$ __________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $ __________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-16 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-16 Remittance Rate:
6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-A-16 Principal Balance
as of the Cut-Off Date:  $[       ]



                                     Cede & Co.
                                  Registered Owner


                                         A-22
<PAGE>

                                                              Exhibit A-III-A-17
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-17

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$ __________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $ __________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-17 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-A-17 Remittance Rate:
6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-A-17 Principal Balance
as of the Cut-Off Date:  $[         ]



                                     Cede & Co.
                                  Registered Owner


                                         A-23
<PAGE>

                                                              Exhibit A-III-A-18
                                                              CUSIP [         ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-A-18

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. [Assuming that
the Mortgage Loans underlying the Certificates prepay at the prepayment
assumption used by the issuer in pricing this Certificate (i.e., 250% of the
Standard Prepayment Assumption as described in the Prospectus Supplement), this
Certificate has been issued with original issue discount ("OID") of no more than
$ __________ per $100,000 of initial Certificate Principal Balance, the yield to
maturity is ____%, and the amount of OID attributable to the short period is not
more than $ __________ per $100,000 of initial Certificate Principal Balance,
computed under the exact method. No representation is made that the Mortgage
Loans will prepay at a rate based on the Standard Prepayment Assumption or any
other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-A-18 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                        ----------------------------------------

Class III-A-18 Remittance Rate:
7.000%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-A-18 Principal Balance
as of the Cut-Off Date:  $[       ]


                                     Cede & Co.
                                  Registered Owner


                                         A-24
<PAGE>


                                                               Exhibit A-III-X-1
                                                               CUSIP

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-X-1

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (I.E., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is _____ %, and the amount
of OID attributable to the short period is not more than $ __________ per
$100,000 of initial Certificate Principal Balance, computed under the exact
method. No representation is made that the Mortgage Loans will prepay at a rate
based on the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-X-1 Notional
                                        Amount as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-X-1 Remittance Rate:
6.750% applied to the Class
III-X-1 Notional Amount

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-X-1 Principal Balance
as of the Cut-Off Date:   $0.00

Class III-X-1 Notional Amount
as of the Cut-Off Date:  $[       ]



                                     Cede & Co.
                                  Registered Owner

                                         A-25
<PAGE>

                                                               Exhibit A-III-X-2
                                                               CUSIP

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-X-2

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
May 7, 1998interest is payable as of the Issue Date with respect to this
Certificate is 6.750% per annum. [Assuming that the Mortgage Loans underlying
the Certificates prepay at the prepayment assumption used by the issuer in
pricing this Certificate (I.E., 250% of the Standard Prepayment Assumption as
described in the Prospectus Supplement), this Certificate has been issued with
original issue discount ("OID") of no more than $ ________ per $100,000 of
initial Certificate Principal Balance, the yield to maturity is _____ %, and the
amount of OID attributable to the short period is not more than $ __________ per
$100,000 of initial Certificate Principal Balance, computed under the exact
method. No representation is made that the Mortgage Loans will prepay at a rate
based on the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                           Portion of the Class III-X-2 Notional
                                        Amount as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-X-2 Remittance Rate:
6.750% applied to the Class
III-X-2 Notional Amount

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-X-2 Principal Balance
as of the Cut-Off Date:   $0.00

Class III-X-2 Notional Amount
as of the Cut-Off Date:  $[        ]



                                     Cede & Co.
                                  Registered Owner


                                         A-26
<PAGE>

                                                                 Exhibit A-III-P
                                                                 CUSIP


                         MORTGAGE PASS-THROUGH CERTIFICATE

                                    Class III-P

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. Interest is not
payable with respect to this Certificate. [Assuming that the Mortgage Loans
underlying the Certificates prepay at the prepayment assumption used by the
issuer in pricing this Certificate (I.E., 250% of the Standard Prepayment
Assumption as described in the Prospectus Supplement), this Certificate has been
issued with original issue discount ("OID") of no more than $ ___________ per
$100,000 of initial Certificate Principal Balance, the yield to maturity is
____%, and the amount of OID attributable to the short period is not more than
$ __________ per $100,000 of initial Certificate Principal Balance, computed
under the exact method. No representation is made that the Mortgage Loans will
prepay at a rate based on the Standard Prepayment Assumption or any other rate.]

Series 1998-4                           Portion of the Class III-P Principal
                                        Balance as of the Cut-Off Date evidenced
                                        by this Certificate:
Class III-P Remittance Rate: 0.00%      $
                                         ---------------------------------------
Cut-Off Date: April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-P Principal Balance
as of the Cut-Off Date:


                                     Cede & Co.
                                  Registered Owner


                                         A-27
<PAGE>

                                                               Exhibit A-III-B-1
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-B-1

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Issue Date") of this Certificate is April 29,
1998. The rate at which interest is payable as of the Issue Date with respect to
this Certificate is 6.750% per annum. [Assuming that the Mortgage Loans
underlying the Certificates prepay at the prepayment assumption used by the
issuer in pricing this Certificate (i.e., 250% of the Standard Prepayment
Assumption as described in the Prospectus Supplement), this Certificate has been
issued with original issue discount ("OID") of no more than $ __________ per
$100,000 of initial Certificate Principal Balance, the yield to maturity is
____%, and the amount of OID attributable to the short period is not more than
$ _________ per $100,000 of initial Certificate Principal Balance, computed
under the exact method. No representation is made that the Mortgage Loans will
prepay at a rate based on the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS III-B-1 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS III-B-1
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.

The Class III-B-1 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

Series 1998-4                           Portion of the Class III-B-1 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-B-1 Remittance Rate:
6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-B-1 Principal Balance
as of the Cut-Off Date:   $[        ]


                                  ------------------

                                   Registered Owner
                                 Certificate No.
                                              -------


                                         A-28
<PAGE>

                                                               Exhibit A-III-B-2
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-B-2

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Issue Date") of this Certificate is April 29,
1998. The rate at which interest is payable as of the Issue Date with respect to
this Certificate is 6.750% per annum. [Assuming that the Mortgage Loans
underlying the Certificates prepay at the prepayment assumption used by the
issuer in pricing this Certificate (i.e., 250% of the Standard Prepayment
Assumption as described in the Prospectus Supplement), this Certificate has been
issued with original issue discount ("OID") of no more than $ __________ per
$100,000 of initial Certificate Principal Balance, the yield to maturity is
____%, and the amount of OID attributable to the short period is not more than
$ _________ per $100,000 of initial Certificate Principal Balance, computed
under the exact method. No representation is made that the Mortgage Loans will
prepay at a rate based on the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS III-B-2 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS III-B-2
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.

The Class III-B-2 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

Series 1998-4                           Portion of the Class III-B-2 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                        ----------------------------------------

Class III-B-2 Remittance Rate:
6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-B-2 Principal Balance
as of the Cut-Off Date:   $[        ]


                                  ------------------

                                   Registered Owner
                                 Certificate No.
                                              ------


                                         A-29
<PAGE>

                                                               Exhibit A-III-B-3
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-B-3

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Issue Date") of this Certificate is April 29,
1998. The rate at which interest is payable as of the Issue Date with respect to
this Certificate is 6.750% per annum. [Assuming that the Mortgage Loans
underlying the Certificates prepay at the prepayment assumption used by the
issuer in pricing this Certificate (i.e., 250% of the Standard Prepayment
Assumption as described in the Prospectus Supplement), this Certificate has been
issued with original issue discount ("OID") of no more than $ ________ per
$100,000 of initial Certificate Principal Balance, the yield to maturity is
____%, and the amount of OID attributable to the short period is not more than $
_________ per $100,000 of initial Certificate Principal Balance, computed under
the exact method. No representation is made that the Mortgage Loans will prepay
at a rate based on the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS III-B-3 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS III-B-3
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.

The Class III-B-3 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

Series 1998-4                           Portion of the Class III-B-3 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

Class III-B-3 Remittance Rate:
6.750%

Cut-Off Date:   April 1, 1998

First Distribution Date:
May 26, 1998

Last Scheduled Distribution Date:

Class III-B-3 Principal Balance
as of the Cut-Off Date:   $[        ]

                                  ------------------

                                   Registered Owner
                                Certificate No.
                                             ------

                                         A-30
<PAGE>

                                                               Exhibit A-III-B-4
                                                               CUSIP [        ]
                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-B-4

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Date") of this Certificate is April 29, 1998. The
rate at which interest is payable as of the Issue Date with respect to this
Certificate is 6.750% per annum. [Assuming that the Mortgage Loans underlying
the Certificates prepay at the prepayment assumption used by the issuer in
pricing this Certificate (i.e., 250% of the Standard Prepayment Assumption as
described in the Prospectus Supplement), this Certificate has been issued with
original issue discount ("OID") of no more than $ ________ per $100,000 of
initial Certificate Principal Balance, the yield to maturity is ____%, and the
amount of OID attributable to the short period is not more than $ _________ per
$100,000 of initial Certificate Principal Balance, computed under the exact
method. No representation is made that the Mortgage Loans will prepay at a rate
based on the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS III-B-4 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS III-B-4
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.  THE SECURITIES REPRESENTED BY THIS CERTIFICATE
     HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. THESE SECURITIES
     MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE
     ABSENCE OF REGISTRATION OR THE AVAILABILITY OF AN EXEMPTION FROM
     REGISTRATION UNDER THE SECURITIES ACT OF 1933 AND EXCEPT IN ACCORDANCE WITH
     SECTION 5.01(e) OF THE POOLING AGREEMENT.

The Class III-B-4 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

     Series 1998-4                      Portion of the Class III-B-4 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

     Class III-B-4 Remittance Rate:
     6.750%

     Cut-Off Date:   April 1, 1998

     First Distribution Date:
     May 26, 1998

     Last Scheduled Distribution Date:

     Class III-B-4 Principal Balance
     as of the Cut-Off Date:   $[       ]

                                  ------------------

                                   Registered Owner

                                         A-31
<PAGE>

                                Certificate No.
                                             -------

                                         A-32
<PAGE>
                                                               Exhibit A-III-B-5
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-B-5

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Date") of this Certificate is April 29, 1998. The
rate at which interest is payable as of the Issue Date with respect to this
Certificate is 6.750% per annum. [Assuming that the Mortgage Loans underlying
the Certificates prepay at the prepayment assumption used by the issuer in
pricing this Certificate (i.e., 250% of the Standard Prepayment Assumption as
described in the Prospectus Supplement), this Certificate has been issued with
original issue discount ("OID") of no more than $ _________ per $100,000 of
initial Certificate Principal Balance, the yield to maturity is ____%, and the
amount of OID attributable to the short period is not more than $ __________ per
$100,000 of initial Certificate Principal Balance, computed under the exact
method. No representation is made that the Mortgage Loans will prepay at a rate
based on the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS III-B-5 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS III-B-5
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY. THE SECURITIES REPRESENTED BY THIS CERTIFICATE
     HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. THESE SECURITIES
     MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE
     ABSENCE OF REGISTRATION OR THE AVAILABILITY OF AN EXEMPTION FROM
     REGISTRATION UNDER THE SECURITIES ACT OF 1933 AND EXCEPT IN ACCORDANCE WITH
     SECTION 5.01(e) OF THE POOLING AGREEMENT.

The Class III-B-5 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

     Series 1998-4                      Portion of the Class III-B-5 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         ---------------------------------------

     Class III-B-5 Remittance Rate:
     6.750%

     Cut-Off Date:   April 1, 1998

     First Distribution Date:
     May 26, 1998

     Last Scheduled Distribution Date:

     Class III-B-5 Principal Balance
     as of the Cut-Off Date:   $[     ]


                                  ------------------

                                   Registered Owner


                                         A-33
<PAGE>


                                 Certificate No.
                                             ------

                                         A-34
<PAGE>

                                                               Exhibit A-III-B-6
                                                               CUSIP [        ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                   Class III-B-6

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Date") of this Certificate is April 29, 1998. The
rate at which interest is payable as of the Issue Date with respect to this
Certificate is 6.750% per annum. [Assuming that the Mortgage Loans underlying
the Certificates prepay at the prepayment assumption used by the issuer in
pricing this Certificate (i.e., 250% of the Standard Prepayment Assumption as
described in the Prospectus Supplement), this Certificate has been issued with
original issue discount ("OID") of no more than $ ________ per $100,000 of
initial Certificate Principal Balance, the yield to maturity is _____%, and the
amount of OID attributable to the short period is not more than $ _________ per
$100,000 of initial Certificate Principal Balance, computed under the exact
method. No representation is made that the Mortgage Loans will prepay at a rate
based on the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS III-B-6 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS III-B-6
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.  THE SECURITIES REPRESENTED BY THIS CERTIFICATE
     HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. THESE SECURITIES
     MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE
     ABSENCE OF REGISTRATION OR THE AVAILABILITY OF AN EXEMPTION FROM
     REGISTRATION UNDER THE SECURITIES ACT OF 1933 AND EXCEPT IN ACCORDANCE WITH
     SECTION 5.01(e) OF THE POOLING AGREEMENT.

The Class III-B-6 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

     Series 1998-4                      Portion of the Class III-B-6 Principal
                                        Balance as of the Cut-Off Date Evidenced
                                        by this Certificate:
                                        $
                                         -------------------------------------
     Class III-B-6 Remittance Rate:
     6.750%

     Cut-Off Date:   April 1, 1998

     First Distribution Date:
     May 26, 1998

     Last Scheduled Distribution Date:

     Class III-B-6 Principal Balance
     as of the Cut-Off Date: $[     ]


                                ----------------------

                                   Registered Owner


                                         A-35
<PAGE>


                                Certificate No.
                                             ------


                                         A-36

<PAGE>




                                                               Exhibit A-IV-A-1
                                                               CUSIP [        ]

                          MORTGAGE PASS-THROUGH CERTIFICATE

                                     Class IV-A-1

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998.

[Assuming that the Mortgage Loans underlying the Certificates prepay at the
prepayment assumption used by the issuer in pricing this Certificate (I.E., 250%
of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $ __________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is _____%, and the amount of OID
attributable to the short period is not more than $ __________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4            Portion of the Class IV-A-1 Principal Balance as of
                         the Cut-Off Date Evidenced by this Certificate:
                         $
                          ---------------------------------------------------

Class IV-A-1 Remittance Rate: 6.500%

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class IV-A-1 Principal Balance as of the Cut-Off Date:


                                      Cede & Co.
                                   Registered Owner

                                         A-37
<PAGE>


                                                                Exhibit A-IV-A-2
                                                                CUSIP [        ]

                          MORTGAGE PASS-THROUGH CERTIFICATE

                                     Class IV-A-2

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998.

[Assuming that the Mortgage Loans underlying the Certificates prepay at the
prepayment assumption used by the issuer in pricing this Certificate (I.E., 250%
of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $ __________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is _____%, and the amount of OID
attributable to the short period is not more than $ __________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                      Portion of the Class IV-A-2 Principal Balance
                                   as of the Cut-Off Date Evidenced by this
                                   Certificate:
                                   $
                                    -------------------------------------------

Class IV-A-2 Remittance Rate: 7.000%

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class IV-A-2 Principal Balance as of the Cut-Off Date:

                                      Cede & Co.
                                   Registered Owner

                                         A-38
<PAGE>

                                                                  Exhibit A-IV-X
                                                                  CUSIP


                          MORTGAGE PASS-THROUGH CERTIFICATE

                                      Class IV-X

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. The rate at which
interest is payable as of the Issue Date with respect to this Certificate is
6.750% per annum. [Assuming that the Mortgage Loans underlying the Certificates
prepay at the prepayment assumption used by the issuer in pricing this
Certificate (I.E., 250% of the Standard Prepayment Assumption as described in
the Prospectus Supplement), this Certificate has been issued with original issue
discount ("OID") of no more than $ __________ per $100,000 of initial
Certificate Principal Balance, the yield to maturity is _____ %, and the amount
of OID attributable to the short period is not more than $ __________  per
$100,000 of initial Certificate Principal Balance, computed under the exact
method. No representation is made that the Mortgage Loans will prepay at a rate
based on the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                      Portion of the Class IV-X Notional Amount as
                                   of the Cut-Off Date Evidenced by this
                                   Certificate:
                                   $
                                    -----------------------------------------

Class IV-X Remittance Rate:  6.750% applied to the Class
IV-X Notional Amount

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class IV-X Principal Balance
as of the Cut-Off Date:   $0.00

Class IV-X Notional Amount
as of the Cut-Off Date:   $[        ]

                                      Cede & Co.
                                   Registered Owner

                                         A-39
<PAGE>

                                                                  Exhibit A-IV-P
                                                                  CUSIP

                          MORTGAGE PASS-THROUGH CERTIFICATE

                                      Class IV-P

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP.

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue
date (the "Issue Date") of this Certificate is April 29, 1998. Interest is not
payable with respect to this Certificate. [Assuming that the Mortgage Loans
underlying the Certificates prepay at the prepayment assumption used by the
issuer in pricing this Certificate (I.E., 250% of the Standard Prepayment
Assumption as described in the Prospectus Supplement), this Certificate has been
issued with original issue discount ("OID") of no more than $____________ per
$100,000 of initial Certificate Principal Balance, the yield to maturity is __%,
and the amount of OID attributable to the short period is not more than
$____________ per $100,000 of initial Certificate Principal Balance, computed
under the exact method. No representation is made that the Mortgage Loans will
prepay at a rate based on the Standard Prepayment Assumption or any other rate.]

Unless this Certificate is presented by an authorized representative of The
Depository Trust Company, a New York corporation ("DTC"), to the Trustee or its
agent for registration of transfer, exchange, or payment, and any Certificate
issued is registered in the name of Cede & Co. or such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

Series 1998-4                      Portion of the Class IV-P Principal
                                   Balance as of the Cut-Off Date evidenced by
                                   this Certificate:
                                   $
Class IV-P Remittance Rate: 0.00%   ------------------------------------------
                                    ------------------------------------------

Cut-Off Date: April 1, 1998

First Distribution Date: May 26, 1998

Last Scheduled Distribution Date:

Class IV-P Principal Balance as of the Cut-Off Date:


                                      Cede & Co.
                                   Registered Owner

                                         A-40
<PAGE>

                                                                Exhibit A-C-B-1
                                                                CUSIP [       ]

                          MORTGAGE PASS-THROUGH CERTIFICATE

                                     Class C-B-1

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Issue Date") of this Certificate is April 29,
1998. [Assuming that the Mortgage Loans underlying the Certificates prepay at
the prepayment assumption used by the issuer in pricing this Certificate (i.e.,
250% of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $ __________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ____%, and the amount of OID
attributable to the short period is not more than $ __________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS C-B-1 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS C-B-1
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.

The Class C-B-1 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

Series 1998-4                      Portion of the Class C-B-1 Principal Balance
                                   as of the Cut-Off Date Evidenced by this
                                   Certificate:

                                   $
                                    -------------------------------------------

Class C-B-1 Remittance Rate:   Variable

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class C-B-1 Principal Balance
as of the Cut-Off Date:   $[        ]



                                   ------------------
                                 Registered Owner
                           Certificate No.
                                             ---------

                                         A-41
<PAGE>

                                                                 Exhibit A-C-B-2
                                                           CUSIP [             ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                    Class C-B-2

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Issue Date") of this Certificate is April 29,
1998. [Assuming that the Mortgage Loans underlying the Certificates prepay at
the prepayment assumption used by the issuer in pricing this Certificate (i.e.,
250% of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $___________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is     %, and the amount of OID
attributable to the short period is not more than $__________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS C-B-2 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS C-B-2
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.

The Class C-B-2 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

Series 1998-4                      Portion of the Class C-B-2 Principal Balance
                                   as of the Cut-Off Date Evidenced by this
                                   Certificate:
                                   $
                                    ------------------------------------------


Class C-B-2 Remittance Rate:   Variable

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class C-B-2 Principal Balance
as of the Cut-Off Date:   $[          ]



                                   ------------------
                                    Registered Owner
                           Certificate No.
                                             ---------

                                         A-42
<PAGE>

                                                                Exhibit A-C-B-3
                                                          CUSIP [             ]
                         MORTGAGE PASS-THROUGH CERTIFICATE

                                    Class C-B-3

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Issue Date") of this Certificate is April 29,
1998. [Assuming that the Mortgage Loans underlying the Certificates prepay at
the prepayment assumption used by the issuer in pricing this Certificate (i.e.,
250% of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $___________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ___ %, and the amount of OID
attributable to the short period is not more than $___________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS C-B-3 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS C-B-3
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.

The Class C-B-3 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

Series 1998-4                      Portion of the Class C-B-3 Principal Balance
                                   as of the Cut-Off Date Evidenced by this
                                   Certificate:
                                   $
                                    -----------------------------------------

Class C-B-3 Remittance Rate:   Variable

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class C-B-3 Principal Balance
as of the Cut-Off Date:   $[           ]


                                   ------------------
                                    Registered Owner
                           Certificate No.
                                             ---------

                                         A-43
<PAGE>

                                                                 Exhibit A-C-B-4
                                                                 CUSIP [       ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                    Class C-B-4

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                             PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Date") of this Certificate is April 29, 1998.
[Assuming that the Mortgage Loans underlying the Certificates prepay at the
prepayment assumption used by the issuer in pricing this Certificate (i.e., 250%
of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $___________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ___ %, and the amount of OID
attributable to the short period is not more than $_________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS C-B-4 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS C-B-4
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.  THE SECURITIES REPRESENTED BY THIS CERTIFICATE
     HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. THESE SECURITIES
     MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE
     ABSENCE OF REGISTRATION OR THE AVAILABILITY OF AN EXEMPTION FROM
     REGISTRATION UNDER THE SECURITIES ACT OF 1933 AND EXCEPT IN ACCORDANCE WITH
     SECTION 5.01(e) OF THE POOLING AGREEMENT.

The Class C-B-4 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

     Series 1998-4                 Portion of the Class C-B-4 Principal Balance
                                   as of the Cut-Off Date Evidenced by this
                                   Certificate:

                                   $
                                    -------------------------------------------

     Class C-B-4 Remittance Rate:   Variable

     Cut-Off Date:   April 1, 1998

     First Distribution Date:   May 26, 1998

     Last Scheduled Distribution Date:

     Class C-B-4 Principal Balance
     as of the Cut-Off Date:   $[          ]


                                   ------------------
                                    Registered Owner
                           Certificate No.
                                             ---------

                                         A-44
<PAGE>

                                                                Exhibit A-C-B-5
                                                                CUSIP [       ]

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                    Class C-B-5

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                             PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Date") of this Certificate is April 29, 1998.
[Assuming that the Mortgage Loans underlying the Certificates prepay at the
prepayment assumption used by the issuer in pricing this Certificate (i.e., 250%
of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $___________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ___ %, and the amount of OID
attributable to the short period is not more than $___________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS C-B-5 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS C-B-5
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY. THE SECURITIES REPRESENTED BY THIS CERTIFICATE
     HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. THESE SECURITIES
     MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE
     ABSENCE OF REGISTRATION OR THE AVAILABILITY OF AN EXEMPTION FROM
     REGISTRATION UNDER THE SECURITIES ACT OF 1933 AND EXCEPT IN ACCORDANCE WITH
     SECTION 5.01(e) OF THE POOLING AGREEMENT.

The Class C-B-5 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

     Series 1998-4                 Portion of the Class C-B-5 Principal Balance
                                   as of the Cut-Off Date Evidenced by this
                                   Certificate:

                                   $
                                    ------------------------------------------

Class C-B-5 Remittance Rate:   Variable

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class C-B-5 Principal Balance
as of the Cut-Off Date:   $[           ]

                                   ------------------
                                    Registered Owner

                                         A-45
<PAGE>


                           Certificate No.
                                             ---------






                                         A-46
<PAGE>

                                                                 Exhibit A-C-B-6
                                                                 CUSIP [       ]

                         MORTGAGE PASS-THROUGH CERTIFICATE
                                    Class C-B-6

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consists of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                            PNC MORTGAGE SECURITIES CORP

This Certificate represents ownership of a "regular interest" in a "real estate
mortgage investment conduit," as those terms are defined in Sections 860G and
860D, respectively, of the Internal Revenue Code of 1986, as amended (the
"Code"). The issue date (the "Date") of this Certificate is April 29, 1998.
[Assuming that the Mortgage Loans underlying the Certificates prepay at the
prepayment assumption used by the issuer in pricing this Certificate (i.e., 250%
of the Standard Prepayment Assumption as described in the Prospectus
Supplement), this Certificate has been issued with original issue discount
("OID") of no more than $___________ per $100,000 of initial Certificate
Principal Balance, the yield to maturity is ___ %, and the amount of OID
attributable to the short period is not more than $___________ per $100,000 of
initial Certificate Principal Balance, computed under the exact method. No
representation is made that the Mortgage Loans will prepay at a rate based on
the Standard Prepayment Assumption or any other rate.]

     IN THE CASE OF ANY CLASS C-B-6 CERTIFICATE PRESENTED FOR REGISTRATION IN
     THE NAME OF AN EMPLOYEE BENEFIT OR OTHER PLAN SUBJECT TO THE PROHIBITED
     TRANSACTION PROVISIONS OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
     1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE (OR COMPARABLE
     PROVISIONS OF ANY SUBSEQUENT ENACTMENTS) (A "PLAN"), A TRUSTEE OF ANY SUCH
     PLAN, OR ANY OTHER PERSON WHO IS USING "PLAN ASSETS" OF ANY SUCH PLAN TO
     EFFECT SUCH ACQUISITION, THE TRUSTEE SHALL REQUIRE, EXCEPT AS OTHERWISE SET
     FORTH IN SECTION 5.01(d) OF THE POOLING AGREEMENT, AN OPINION OF COUNSEL
     ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE
     COMPANY TO THE EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS C-B-6
     CERTIFICATE IS PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR
     RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR
     SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY (INCLUDING
     OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975 OF
     THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
     OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER
     SERVICER OR THE COMPANY.  THE SECURITIES REPRESENTED BY THIS CERTIFICATE
     HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. THESE SECURITIES
     MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE
     ABSENCE OF REGISTRATION OR THE AVAILABILITY OF AN EXEMPTION FROM
     REGISTRATION UNDER THE SECURITIES ACT OF 1933 AND EXCEPT IN ACCORDANCE WITH
     SECTION 5.01(e) OF THE POOLING AGREEMENT.

The Class C-B-6 Certificates will be subordinate in right of payment to and
provide credit support to certain Classes of Certificates, as described in the
Pooling Agreement.

     Series 1998-4                 Portion of the Class C-B-6 Principal Balance
                                   as of the Cut-Off Date Evidenced by this
                                   Certificate:
                                   $
                                    ------------------------------------------

Class C-B-6 Remittance Rate:   Variable

Cut-Off Date:   April 1, 1998

First Distribution Date:   May 26, 1998

Last Scheduled Distribution Date:

Class C-B-6 Principal Balance
as of the Cut-Off Date:   $[          ]


                                   ------------------
                                    Registered Owner

                                         A-47
<PAGE>

                           Certificate No.
                                             ---------





                                         A-48
<PAGE>

                                                                    Exhibit B
                                                                    CUSIP

                          MORTGAGE PASS-THROUGH CERTIFICATE

                                      Class R-2

Evidencing a Percentage Interest in a trust fund whose assets consist of
interests in another trust fund whose assets consist of, among other things, a
pool of conventional one- to four-family mortgage loans formed and administered
by

                           PNC MORTGAGE SECURITIES CORP.

ANY RESALE, TRANSFER OR OTHER DISPOSITION OF THIS CERTIFICATE MAY BE MADE ONLY
IF THE PROPOSED TRANSFEREE PROVIDES A TRANSFER AFFIDAVIT TO THE COMPANY AND THE
CERTIFICATE REGISTRAR THAT (1) SUCH TRANSFEREE IS NOT EITHER (A) THE UNITED
STATES, ANY STATE OR POLITICAL SUBDIVISION THEREOF, ANY FOREIGN GOVERNMENT, ANY
INTERNATIONAL ORGANIZATION, OR ANY AGENCY OR INSTRUMENTALITY OF ANY OF THE
FOREGOING, (B) ANY ORGANIZATION (OTHER THAN A COOPERATIVE DESCRIBED IN SECTION
521 OF THE CODE) WHICH IS EXEMPT FROM THE TAX IMPOSED BY CHAPTER 1 OF THE CODE
UNLESS SUCH ORGANIZATION IS SUBJECT TO THE TAX IMPOSED BY SECTION 511 OF THE
CODE, (C) ANY ORGANIZATION DESCRIBED IN SECTION 1381(a)(2)(C) OF THE CODE (ANY
SUCH PERSON DESCRIBED IN THE FOREGOING CLAUSES (A), (B), OR (C) BEING
HEREINAFTER REFERRED TO AS A "DISQUALIFIED ORGANIZATION"), OR (D) AN AGENT OF A
DISQUALIFIED ORGANIZATION AND (2) NO PURPOSE OF SUCH TRANSFER IS TO ENABLE THE
TRANSFER TO IMPEDE THE ASSESSMENT OR COLLECTION OF TAX. SUCH AFFIDAVIT SHALL
INCLUDE CERTAIN REPRESENTATIONS AS TO THE FINANCIAL CONDITION OF THE PROPOSED
TRANSFEREE. NOTWITHSTANDING THE REGISTRATION IN THE CERTIFICATE REGISTER OF ANY
TRANSFER, SALE OR OTHER DISPOSITION OF THIS CLASS R-2 CERTIFICATE TO A
DISQUALIFIED ORGANIZATION OR AN AGENT OF A DISQUALIFIED ORGANIZATION, SUCH
REGISTRATION SHALL BE DEEMED TO BE OF NO LEGAL FORCE OR EFFECT WHATSOEVER AND
SUCH PERSON SHALL NOT BE DEEMED TO BE A CERTIFICATEHOLDER FOR ANY PURPOSE
HEREUNDER, INCLUDING, BUT NOT LIMITED TO, THE RECEIPT OF DISTRIBUTIONS ON THIS
CERTIFICATE. EACH HOLDER OF A CLASS R-2 CERTIFICATE BY ACCEPTANCE OF THIS
CERTIFICATE SHALL BE DEEMED TO HAVE CONSENTED TO THE PROVISIONS OF THIS
PARAGRAPH.

NO TRANSFER OF ANY CLASS R-2 CERTIFICATE SHALL BE MADE UNLESS THE TRANSFEREE
PROVIDES THE COMPANY AND THE TRUSTEE WITH AN OPINION OF COUNSEL ACCEPTABLE TO
AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE
EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS R-2 CERTIFICATE IS PERMISSIBLE
UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED
TRANSACTION UNDER SECTION 406 OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE
TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY
(INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975
OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER SERVICER,
THE REMIC I TRUST FUND, THE REMIC II TRUST FUND OR THE COMPANY.

Solely for U.S. federal income tax purposes, this Certificate represents a
"residual interest" in a "real estate mortgage investment conduit," as those
terms are defined in Sections 860G and 860D, respectively, of the Internal
Revenue Code of 1986, as amended.

     Series 1998-4                 Percentage Interest evidenced by this Class
                                   R-2 Certificate in the distributions to be
                                   made with respect to the Class R-2
                                   Certificates:                              %
                                                 -----------------------------

     Class R-2 Remittance Rate: 6.750%.  Additionally
     the Class R-2 Certificates are entitled to the
     Residual Distribution Amount as defined in the
     Pooling Agreement.

     Cut-Off Date:   April 1, 1998

     First Distribution Date:   May 26, 1998

     Last Scheduled Distribution Date:

     Class R Principal Balance as of the Cut-Off Date:   $50.00


                                   ------------------
                                    Registered Owner

                                         B-1

<PAGE>

                           Certificate No.
                                             ---------

                                         B-1

<PAGE>

                                                                     Exhibit C
                                                                     CUSIP

                         MORTGAGE PASS-THROUGH CERTIFICATE

                                     Class R-1

Evidencing a Percentage Interest in certain distributions with respect to a pool
of conventional one- to four-family mortgage loans formed and administered by

                           PNC MORTGAGE SECURITIES CORP.

ANY RESALE, TRANSFER OR OTHER DISPOSITION OF THIS CERTIFICATE MAY BE MADE ONLY
IF THE PROPOSED TRANSFEREE PROVIDES A TRANSFER AFFIDAVIT TO THE COMPANY AND THE
CERTIFICATE REGISTRAR THAT (1) SUCH TRANSFEREE IS NOT EITHER (A) THE UNITED
STATES, ANY STATE OR POLITICAL SUBDIVISION THEREOF, ANY FOREIGN GOVERNMENT, ANY
INTERNATIONAL ORGANIZATION, OR ANY AGENCY OR INSTRUMENTALITY OF ANY OF THE
FOREGOING, (B) ANY ORGANIZATION (OTHER THAN A COOPERATIVE DESCRIBED IN SECTION
521 OF THE CODE) WHICH IS EXEMPT FROM THE TAX IMPOSED BY CHAPTER 1 OF THE CODE
UNLESS SUCH ORGANIZATION IS SUBJECT TO THE TAX IMPOSED BY SECTION 511 OF THE
CODE, (C) ANY ORGANIZATION DESCRIBED IN SECTION 1381(a)(2)(C) OF THE CODE (ANY
SUCH PERSON DESCRIBED IN THE FOREGOING CLAUSES (A), (B), OR (C) BEING
HEREINAFTER REFERRED TO AS A "DISQUALIFIED ORGANIZATION"), OR (D) AN AGENT OF A
DISQUALIFIED ORGANIZATION AND (2) NO PURPOSE OF SUCH TRANSFER IS TO ENABLE THE
TRANSFER TO IMPEDE THE ASSESSMENT OR COLLECTION OF TAX. SUCH AFFIDAVIT SHALL
INCLUDE CERTAIN REPRESENTATIONS AS TO THE FINANCIAL CONDITION OF THE PROPOSED
TRANSFEREE. NOTWITHSTANDING THE REGISTRATION IN THE CERTIFICATE REGISTER OF ANY
TRANSFER, SALE OR OTHER DISPOSITION OF THIS CLASS R-1 CERTIFICATE TO A
DISQUALIFIED ORGANIZATION OR AN AGENT OF A DISQUALIFIED ORGANIZATION, SUCH
REGISTRATION SHALL BE DEEMED TO BE OF NO LEGAL FORCE OR EFFECT WHATSOEVER AND
SUCH PERSON SHALL NOT BE DEEMED TO BE A CERTIFICATEHOLDER FOR ANY PURPOSE
HEREUNDER, INCLUDING, BUT NOT LIMITED TO, THE RECEIPT OF DISTRIBUTIONS ON THIS
CERTIFICATE. EACH HOLDER OF A CLASS R-1 CERTIFICATE BY ACCEPTANCE OF THIS
CERTIFICATE SHALL BE DEEMED TO HAVE CONSENTED TO THE PROVISIONS OF THIS
PARAGRAPH.

NO TRANSFER OF ANY CLASS R-1 CERTIFICATE SHALL BE MADE UNLESS THE TRANSFEREE
PROVIDES THE COMPANY AND THE TRUSTEE WITH AN OPINION OF COUNSEL ACCEPTABLE TO
AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE
EFFECT THAT THE PURCHASE OR HOLDING OF A CLASS R-1 CERTIFICATE IS PERMISSIBLE
UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED
TRANSACTION UNDER SECTION 406 OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF
1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF THE CODE AND WILL NOT SUBJECT THE
TRUSTEE, THE MASTER SERVICER OR THE COMPANY TO ANY OBLIGATION OR LIABILITY
(INCLUDING OBLIGATIONS OR LIABILITIES UNDER SECTION 406 OF ERISA OR SECTION 4975
OF THE CODE) IN ADDITION TO THOSE UNDERTAKEN IN THE POOLING AGREEMENT, WHICH
OPINION OF COUNSEL SHALL NOT BE AN EXPENSE OF THE TRUSTEE, THE MASTER SERVICER,
THE REMIC I TRUST FUND, THE REMIC II TRUST FUND OR THE COMPANY.

Solely for U.S. federal income tax purposes, this Certificate represents a
"residual interest" in a "real estate mortgage investment conduit," as those
terms are defined in Sections 860G and 860D, respectively, of the Internal
Revenue Code of 1986, as amended.

     Series 1998-4                 Percentage Interest evidenced by this Class
                                   R-1 Certificate in the distributions to be
                                   made with respect to the Class R-1
                                   Certificates:                               %
                                                  ----------------------------

     Class R-1 Remittance Rate: 6.750%.  Additionally
     the Class R-1 Certificates are entitled to Excess
     Liquidation Proceeds and the Residual Distribution
     Amount as defined in the Pooling Agreement.

     Cut-Off Date:   April 1, 1998

     First Distribution Date:   May 26, 1998

     Last Scheduled Distribution Date:

     Class R-1 Principal Balance as of the Cut-Off Date:   $50.00


                                   ------------------
                                    Registered Owner

                                         B-1

<PAGE>

                           Certificate No.
                                             ---------

                                         B-1

<PAGE>

     This Certificate does not represent an obligation of or interest in PNC
Mortgage Securities Corp. or any of its affiliates, including PNC Bank Corp.
Neither this Certificate nor the underlying Mortgage Loans are guaranteed by any
agency or instrumentality of the United States.

     This certifies that the above-named Registered Owner is the registered
owner of certain interests in a trust fund (the "REMIC I Trust Fund") whose
assets consist of, among other things, a pool (the "Mortgage Pool") of
conventional one- to four-family mortgage loans (the "Mortgage Loans"), formed
and administered by PNC Mortgage Securities Corp. (the "Company"), which term
includes any successor entity under the Pooling Agreement referred to below. The
Mortgage Pool was created pursuant to a Pooling and Servicing Agreement, dated
as of the Cut-Off Date stated above (the "Pooling Agreement"), between the
Company and U.S. Bank National Association, as Trustee (the "Trustee"), a
summary of certain of the pertinent provisions of which is set forth hereafter.
To the extent not defined herein, the capitalized terms used herein have the
meanings assigned in the Pooling Agreement. Nothing herein shall be deemed
inconsistent with such meanings, and in the event of any conflict between the
Pooling Agreement and the terms of this Certificate, the Pooling Agreement shall
control. This Certificate is issued under and is subject to the terms,
provisions and conditions of the Pooling Agreement, to which Pooling Agreement
the Holder of this Certificate, by virtue of the acceptance hereof, assents and
by which such Holder is bound.

     Distributions will be made, pursuant to the Pooling Agreement, on the 25th
day of each month or, if such 25th day is not a Business Day, the Business Day
immediately following (the "Distribution Date"), commencing on the first
Distribution Date specified above, to the Person in whose name this Certificate
is registered at the close of business on the last day (or if such last day is
not a Business Day, the Business Day immediately preceding such last day) of the
month immediately preceding the month of such distribution (the "Record Date"),
to the extent of such Certificateholder's Percentage Interest represented by
this Certificate in the portion of the REMIC I Available Distribution Amount for
such Distribution Date then distributable on the Certificates of this Class, as
specified in Section 4.01 of the Pooling Agreement.

     Distributions on this Certificate will be made by the Trustee by wire
transfer or check mailed to the address of the Person entitled thereto, as such
name and address shall appear on the Certificate Register. Notwithstanding the
above, the final distribution on this Certificate will be made after due notice
by the Trustee of the pendency of such distribution and only upon presentation
and surrender of this Certificate to the Certificate Registrar.

     Reference is hereby made to the further provisions of this Certificate set
forth below, which further provisions shall for all purposes have the same
effect as if set forth at this place.

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



                                         B-1
<PAGE>

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

                                   U.S. BANK NATIONAL ASSOCIATION, as Trustee


                                   By:
                                       ---------------------------------------


                     (TRUSTEE'S CERTIFICATE OF AUTHENTICATION)

     This is one of the Certificates referred to in the within-mentioned 
Pooling Agreement.

U.S. BANK NATIONAL ASSOCIATION,

as Trustee


By:
   ----------------------

Dated:
      -------------------

                                         B-1
<PAGE>

                           PNC MORTGAGE SECURITIES CORP.
                         MORTGAGE PASS-THROUGH CERTIFICATE

     This Certificate is one of a duly authorized issue of Certificates
designated as Mortgage Pass-Through Certificates of the Series and Class
specified hereon (herein called the "Certificates") and representing certain
interests in the REMIC I Trust Fund.

     The Certificates do not represent an obligation of, or an interest in, the
Company or any of its affiliates and are not insured or guaranteed by any
governmental agency. The Certificates are limited in right of payment to certain
collections and recoveries respecting the Mortgage Loans, all as more
specifically set forth herein and in the Pooling Agreement. In the event funds
are advanced with respect to any Mortgage Loan, such advance is reimbursable to
the Master Servicer from the related recoveries on such Mortgage Loan or from
other cash deposited in the Certificate Account to the extent that such advance
is not otherwise recoverable.

     As provided in the Pooling Agreement, withdrawals from the Certificate
Account may be made from time to time for purposes other than distributions to
Certificateholders, such purposes including reimbursement to the Master Servicer
of advances made, or certain expenses incurred, by it.

     The Pooling Agreement permits, with certain exceptions therein provided,
the amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Certificateholders under the Pooling Agreement at
any time by the Company, the Master Servicer and the Trustee with the consent of
the Holders of the Certificates evidencing Percentage Interests aggregating not
less than 66% of the REMIC II Trust Fund. For the purposes of such provision and
except as provided below, voting rights relating to 100% of the Aggregate
Certificate Principal Balance will be allocated pro rata (by Certificate
Principal Balance) among such Certificates. The Pooling Agreement also permits
the amendment thereof, in certain limited circumstances, without the consent of
the Holders of any of the Certificates.

     As provided in the Pooling Agreement and subject to certain limitations
therein set forth, the transfer of this Certificate is registrable in the
Certificate Register upon surrender of this Certificate for registration of
transfer at the offices of the Certificate Registrar or the office maintained by
the Trustee in the City and State of New York, duly endorsed by, or accompanied
by an assignment in the form below or other written instrument of transfer in
form satisfactory to the Trustee or any Authenticating Agent duly executed by,
the Holder hereof or such Holder's attorney duly authorized in writing, and
thereupon one or more new Certificates of Authorized Denominations evidencing
the same Percentage Interest set forth hereinabove will be issued to the
designated transferee or transferees.

     No transfer of a Certificate will be made unless such transfer is exempt
from or is made in accordance with the registration requirements of the
Securities Act of 1933, as amended (the "Securities Act") and any applicable
state securities laws. In the event that a transfer is to be made without
registration or qualification under applicable laws, (i) in the event such
transfer is made pursuant to Rule 144A under the Securities Act, the Company and
the Trustee shall require the transferee to execute an investment letter in
substantially the form attached as Exhibit L to the Pooling Agreement, which
investment letter shall not be an expense of the Company, the Master Servicer or
the Trustee and (ii) in the event that such a transfer is not made pursuant to
Rule 144A under the Securities Act, the Company may require an Opinion of
Counsel satisfactory to the Company that such transfer may be made without such
registration or qualification, which Opinion of Counsel shall not be an expense
of the Company, the Master Servicer or the Trustee. Neither the Company nor the
Trustee will register the Certificate under the Securities Act, qualify the
Certificate under any state securities law or provide registration rights to any
purchaser. Any

                                         B-1
<PAGE>

Holder desiring to effect such transfer shall, and does hereby agree to,
indemnify the Trustee, the Company and the Master Servicer against any liability
that may result if the transfer is not so exempt or is not made in accordance
with such federal and state laws.

     The Certificates are issuable only as registered Certificates without
coupons in Authorized Denominations specified in the Pooling Agreement. As
provided in the Pooling Agreement and subject to certain limitations therein set
forth, Certificates are exchangeable for new Certificates of Authorized
Denominations evidencing the same aggregate interest in the portion of the REMIC
I Available Distribution Amount distributable on this Class of Certificate, as
requested by the Holder surrendering the same.

     A reasonable service charge may be made for any such registration of
transfer or exchange, and the Trustee may require payment of a sum sufficient to
cover any tax or other governmental charge payable in connection therewith.

     The Company, the Trustee and the Certificate Registrar and any agent of the
Company, the Trustee or the Certificate Registrar may treat the Person in whose
name this Certificate is registered as the owner hereof for all purposes, and
neither the Company, the Trustee, the Certificate Registrar nor any such agent
shall be affected by notice to the contrary.

     The obligations created by the Pooling Agreement and the REMIC II Trust
Fund created thereby shall terminate upon (i) the later of the maturity or other
liquidation (including repurchase by the Company) of the last Mortgage Loan
remaining in the REMIC I Trust Fund or the disposition of all property acquired
upon foreclosure or deed in lieu of foreclosure of any Mortgage Loan, and (ii)
the payment to Certificateholders of all amounts held by the Trustee and
required to be paid to them pursuant to the Pooling Agreement. In the event that
the Company repurchases any Mortgage Loan pursuant to the Pooling Agreement,
such Pooling Agreement generally requires that the Trustee distribute to the
Certificateholders in the aggregate an amount equal to 100% of the unpaid
Principal Balance of such Mortgage Loan, plus accrued interest at the applicable
Pass-Through Rate to the next scheduled Due Date for the Mortgage Loan. The
Pooling Agreement permits, but does not require, the Company to repurchase from
the REMIC I Trust Fund all Mortgage Loans at the time subject thereto and all
property acquired in respect of any Mortgage Loan upon payment to the
Certificateholders of the amounts specified in the Pooling Agreement. The
exercise of such right will effect early retirement of the Certificates, the
Company's right to repurchase being subject to the aggregate unpaid Principal
Balance of the Mortgage Loans at the time of repurchase being less than five
percent (5%) of the aggregate unpaid Principal Balance of the Mortgage Loans as
of the Cut-Off Date.

                                         B-1
<PAGE>

                                     ASSIGNMENT


     FOR VALUE RECEIVED the undersigned hereby sell(s) and assign(s) and
transfer(s) unto
                 -------------------------------------------------------------

- ------------------------------------------------------------------------------

- ------------------------------------------------------------------------------
(Please print or typewrite name and address, including postal zip code of
assignee. Please insert social security or other identifying number of
assignee.)

the within Mortgage Pass-Through Certificate and hereby irrevocably constitutes
and appoints

- ------------------------------------------------------------------------------
Attorney to transfer said Certificate on the Certificate Register, with full
power of substitution in the premises.

Dated:
       -------------          ------------------------------------------------
                              Signature Guaranteed

                              -------------------------------------------------
                              NOTICE:   The signature to this assignment must
                                        correspond with the name as written upon
                                        the face of the within instrument in
                                        every particular, without alteration or
                                        enlargement or any change whatever.
                                        This Certificate does not represent an
                                        obligation of or an interest in PNC
                                        Mortgage Securities Corp. or any of its
                                        affiliates, including PNC Bank Corp.
                                        Neither this Certificate nor the
                                        underlying Mortgage Loans are guaranteed
                                        by any agency or instrumentality of the
                                        United States.

                                         B-1

<PAGE>

                                                                       Exhibit D

                               MORTGAGE LOAN SCHEDULE

     Copies of the Mortgage Loan Schedules (which have been intentionally
omitted from this filing) may be obtained from PNC Mortgage Securities Corp. or
U.S. Bank National Association by contacting,

     in the case of PNC Mortgage Securities Corp.,


                                    Richie Moore
                            Master Servicing Department
                           PNC Mortgage Securities Corp.
                                75 N. Fairway Drive
                           Vernon Hills, Illinois  60061
                             Telephone:  (847) 549-3683
                             Facsimile:  (847) 549-3681

     in the case of U.S. Bank National Association,

                                    Tina Hatfield
                              Corporate Trust Department
                            U.S. Bank National Association
                                 180 E. Fifth Street
                              St. Paul, Minnesota  55101
                              Telephone:  (612) 244-5021
                              Facsimile:  (612) 244-0711

                                         D-1

<PAGE>

                                                                     Exhibit E


                                SELLING AND SERVICING

                                       CONTRACT

          This Selling and Servicing Contract (the "Contract"), made and entered
into by PNC Mortgage Securities Corp. ("Buyer") and the Seller ("Seller")
identified below,

                                    WITNESSETH:

          WHEREAS, Seller has submitted a Seller Application to Buyer and has
otherwise been approved by Buyer; and

          WHEREAS, Seller has received the Buyers Selling Guide and the Buyers
Servicing Guide (the "Guides");

          NOW THEREFORE, in consideration of the premises and of the mutual
agreements herein contained, Buyer and Seller hereto agree as follows:

          1.   GUIDES.  The Guides, which set forth the terms and conditions
under which Seller is to sell and service mortgages, are supplements to this
Contract and such Guides, as may be amended or supplemented from time to time,
are incorporated into this Contract in full by reference and made a part hereof
as fully as if set forth at length herein.  All capitalized terms used herein
and not defined herein have the meanings ascribed to them in Appendix A,
Glossary of Terms, to the Guides.

          2.   SELLERS DUTIES.  Seller shall diligently perform all duties
incident to the selling and servicing of all mortgages which may be sold by
Seller from time to time and such other mortgages as Buyer and Seller may
mutually agree upon.  In the performance of such duties, Seller shall employ
procedures and exercise the same care that it would maintain for loans held in
its own portfolio and in accordance with standards of practice, diligence,
prudence and competence maintained by the mortgage banking industry.  Seller
shall also comply with all of the provisions of the Guides and with all other
reasonable requirements and instructions of Buyer.  Seller shall perform such
services at its sole expense except as otherwise expressly provided in the
Guides.  Seller agrees to service each of such mortgages continuously beginning
with the Purchase Date for such mortgages or the date of designation of Seller
as replacement Servicer for mortgages previously purchased by Buyer from another
Seller, until all interest and principal on each mortgage has been paid in full,
the mortgage has been liquidated as pro-vided in the Guides, or such servicing
duties are terminated by Buyer.

          3.   COMPENSATION.  Seller shall be compensated for its services
hereunder as specified in the Guides.

          4.   DOCUMENTS AND RECORDS.  Seller agrees to create, maintain and
transmit all mortgage records and documents including all permanent mortgage
account records in accordance with the Guides.  With respect to such records and
documents, Seller shall have custody privileges and Buyer shall have ownership
of the mortgage records and documents.  Buyer may inspect such records and
documents at reasonable times during Sellers normal business hours.  Seller
shall maintain accurate records and books of account, an adequate system of
audit and internal control, and shall conduct its origination and servicing
activities in a responsible and business-like manner.  Seller shall promptly
notify Buyer in writing of any

                                         E-1

<PAGE>

activity or action, either internal or external, which could potentially affect
adversely the terms of any mortgage serviced hereunder or the ability of Seller
to service any mortgage.

          5.   WARRANTIES, OBLIGATIONS AND REPRESENTATIONS.  The warranties,
obligations and representations stated in the Guides and hereby made or
undertaken by Seller with respect to each of the mortgages to be sold and
serviced by it on behalf of Buyer, unless expressly waived in writing by Buyer.
All warranties made by Seller shall survive (i) any investigation made by or on
behalf of Buyer, it assignee or designee, (ii) liquidation of the mortgage,
(iii) purchase of the mortgage by Buyer, its designee or assignee, (iv)
repurchase of the mortgage by Seller, and (v) termination of this Contract, or
similar event, and all such warranties shall inure to the benefit of Buyer, its
successors and assigns and any transferee of any mortgage.  Upon specific
written request from Buyer, Seller shall supply evidence that is satisfactory to
Buyer of its compliance with any provisions of the Guides.

          6.   REPURCHASE OBLIGATION.  If, after purchase of any mortgage by
Buyer, any of the representations or warranties of the Seller contained herein
or in the Selling Guide are untrue, Buyer may, at its option, without regard to
the Sellers actual or implied knowledge of the untruth of such warranty (except
to the extent the warranty is expressly conditioned upon the Sellers actual
knowledge), in addition to and without limitation as to any other remedy
accruing to Buyer, require the Seller to repurchase said mortgage pursuant to
the Guides.  It is contemplated that a third party will purchase from Buyer the
mortgages purchased from Seller, and Seller agrees that Buyer may, in its own
name or in the name of the third party, exercise any rights or remedies at law
or in equity on behalf of itself or such third party.

          7.   CUSTODIANSHIP OF FUNDS.  Seller shall fully account to Buyer for
the custodianship of funds received from, or on behalf of, a Borrower for
mortgages serviced hereunder.  Seller shall establish and maintain custodial
accounts in accordance with the Guides for (i) the segregation of all principal
and interest received, and (ii) the administration of all amounts to be
deposited into escrow accounts, and such accounts shall be maintained free and
clear of any lien or encumbrance.  Seller must be in control of the funds in its
custody at all times, and upon request from time to time of Buyer shall submit
complete and accurate analyses of cash balances on hand and of the receipt,
deposit and disposition of monies handled.

          8.   INDEMNIFICATION BY SELLER.  Seller shall indemnify Buyer from and
hold Buyer harmless against all losses, damages, penalties, fines, forfeitures,
legal fees and related costs, judgments, and any other costs, fees, and expenses
heretofore or hereafter resulting from a material breach of any warranty,
obligation or representation contained in or made pursuant to this Contract or
from any claim, demand, defense or assertion against or involving Buyer or its
assignee or transferee of any mortgage based on or grounded upon, or resulting
from such breach or a breach of any representation, warranty or obligation made
by Buyer in reliance upon any warranty, obligation or representation made by
Seller contained in or made pursuant to this Contract.  Seller hereby
acknowledges Buyers intent to sell the mortgages to third parties in reliance
upon Sellers warranties, obligations and representation.  The obligations of
Seller under this paragraph shall survive delivery and payment for the
mortgages, liquidation or repurchase of the mortgages and termination of this
Contract or the expiration hereof.

          9.   NO ASSIGNMENT.  This Contract is of the nature of a personal
service agreement and accordingly may not be assigned by Seller.  Except as
provided in paragraph 10 of this Contract, Seller may not assign or other-wise
transfer its responsibility for servicing individual mortgages to any other
entity, including affiliates.  Any attempt to assign servicing rights without
the prior written consent of

                                         E-2
<PAGE>

Buyer shall be null and void.  Any such assignment without the consent of Buyer
shall be grounds for immediate termination of the servicing rights with respect
to the servicing purportedly assigned.

          10.  SUBCONTRACTING OF SERVICING.  Seller may not, without Buyers
prior written approval, subcontract with any other entity, including affiliates,
its responsibility for servicing any mortgage it has contracted to service for
Buyer.
          11.  TERMINATION BY BUYER.  Buyer may terminate the right of Seller to
continue to service mortgage loans for Buyer and/or revoke the status of Seller
as an approved Seller for any of the reasons set forth in the Guides, including
a change in Sellers form of organization, a transfer of 25% or more of the
equity interest in Seller or change in its principal executive or financial
officers.  No such termination shall release Seller from any of its obligations
hereunder or under the Guides or from any liability arising hereunder or
thereunder.  Any forbearance or delay by Buyer in exercising such rights shall
not be deemed a waiver of  and shall not preclude the exercise of any such
right.  Upon termination by Buyer of this Contract for any reason other than a
failure of Seller to meet the eligibility requirements as set forth in the
Guides as determined by Buyer, Seller shall be compensated for such termination
in the amount specified in the Servicing Guide.

          12.  ATTORNEYS FEES.  In the event of a dispute arising from or
concerning an obligation of the Seller or Buyer under this Contract which
results in litigation of the issue, the prevailing party to such litigation
shall be indemnified by the other party for all costs and expenses in bringing
or defending such action.

          13.  OFFSET.  Buyer shall have the right to offset amounts due from
Seller against the purchase price to be paid for the acquisition of mortgages.
Amounts due which may be offset include but are not limited to past due pair-off
fees and funds for the repurchase of mortgages which are subject to an
outstanding repurchase demand.

          14.  NOTICE.  Any notice required or permitted hereunder shall be in
writing and shall be sent to Seller at its address shown under its signature
below or to such other address Seller may designate in writing or to Buyer at 75
North Fairway Drive, Vernon Hills, Illinois 60061 or to such other address
designated by Buyer in writing, by certified mail, return receipt requested,
postage prepaid.

          15.  PRIOR AGREEMENTS.  This Contract supersedes any prior agreements
and understandings between Buyer and Seller governing the subject matter hereof;
provided, however, that Seller shall not be released from any responsibility or
liability that may have arisen under such agreements and understandings.

          16.  GOVERNING LAW.  This Contract is made in the State of Illinois
and shall be governed by the law of such state.

          17.  USE OF TERM "SELLER".  Wherever the term "Seller" is used in this
contract in a context involving loan administration, servicing, and accounting
obligations, such term shall be deemed to mean "Servicer" as is used in the
Buyers Servicing Guide.

          18.  EFFECTIVE DATE OF CONTRACT.  This contract is not effective until
it is accepted by Buyer.  An executed copy of the Contract will be returned to
the Seller.

                                         E-3

<PAGE>

          19.  STATUS OF PARTIES.  Seller and Buyer each represent, warrant and
agree that as of the date of this Contract: (i) each party is duly organized,
validly existing and in good legal standing under the laws of its jurisdiction
of organization, and has the requisite power and authority to enter into this
contract and agreements to which both are parties as contemplated by this
Contract; (ii) this Contract has been duly authorized executed and delivered to
both parties and constitutes a valid and legally binding agreement of each
party, enforceable in accordance with its terms; (iii) there is no action,
proceeding or investigation pending or threatened, nor any basis therefore known
to either party that questions the validity or prospective validity of this
Contract insofar as the Contract relates to either party, or any essential
element upon which this Contract depends, or any action to be taken by either
party pursuant to this Contract; and (iv) insofar as either partys capacity to
carry out any obligation under this Contract is concerned, neither party will be
in violation of any provision of any charter, certificate of incorporation,
bylaw, mortgage, indenture, indebtedness, agreement, instrument, judgment,
decree, order, statute, rule, or regulation, and there is no such provision that
adversely affects either partys capacity to carry out any such obligation.
Sellers and Buyers execution of, and performance pursuant to, this Contract will
not result in any such violation.  At all times Seller shall act as an
independent contractor.

                                         E-4

<PAGE>

          IN WITNESS WHEREOF, the parties have executed this Contract by proper
officials duly authorized on the dates hereinafter set forth.  This Contract
shall take effect as of the date of its execution in original or facsimile
signature by a duly authorized officer of the Buyer.


- ---------------------------------------      ----------------------------------
             Name of Seller                         Seller I.D. Number


- ---------------------------------------      ----------------------------------
          Type of Organization                    Organized under laws of

- -------------------------------------------------------------------------------
         Principal place of business:  street address, city, state, zip code

- -------------------------------------------------------------------------------
                 Typed name and title of Seller's authorized officer

- ----------------------------------------     ----------------------------------
Signature of Seller's authorized officer                  Date

Agreed to and accepted by PNC MORTGAGE SECURITIES CORP.

- -------------------------------------------------------------------------------
                  Typed name and title of authorized representative


- ---------------------------------------           -----------------------------
Signature of authorized representative                    Date


                                         E-5

<PAGE>

                                                                     Exhibit F


                         FORM OF TRANSFEROR CERTIFICATE FOR

                          JUNIOR SUBORDINATE CERTIFICATES


                                       [Date]


U.S. Bank National Association, as Trustee

180 East 5th Street, SPFT0210
St. Paul, MN 55101


     Re:       Purchase of PNC Mortgage Securities Corp. Mortgage Pass-Through
               Certificates Series 1998-4, Class [   ]  (the "Certificates")

Ladies and Gentlemen:

In connection with our disposition of the above Certificates we certify that (a)
we understand the Certificates have not been registered under the Securities Act
of 1933, as amended (the "Act") and are being disposed by us in a transaction
that is exempt from the registration requirements of the Act, and (b) we have
not offered or sold any certificates to, or solicited offers to buy any
Certificates from, any person, or otherwise approached or negotiated with any
person with respect thereto, or taken any other action which would result in a
violation of Section 5 of the Act.


                                   Very truly yours,

                                   [Name of Transferor]


                                   By:
                                      ---------------------------
                                        Authorized Officer

                                         F-1

<PAGE>

                                                                     Exhibit G


                          FORM OF TRANSFEREE'S AGREEMENT FOR

                           JUNIOR SUBORDINATE CERTIFICATES

                                        [Date]

U.S. Bank National Association

180 East 5th Street, SPFT0210
St. Paul, MN 55101

PNC Mortgage Securities Corp.

75 N. Fairway Drive
Vernon Hills, Illinois  60061


          The undersigned (the "Purchaser") proposes to purchase Class [   ]
Certificates evidencing an undivided interest in PNC Mortgage Securities Corp.
Mortgage Pass-Through Certificates, Series 1998-4 (the "Purchased Certificates")
in the principal amount of $______________. In doing so, the Purchaser hereby
acknowledges and agrees as follows:

          Section 1. Definitions. Each capitalized term used herein and not
otherwise defined herein shall have the meaning ascribed to it in the Pooling
and Servicing Agreement, dated as of April 1, 1998 (the "Pooling Agreement"), by
and between PNC Mortgage Securities Corp. ("PNC") and U.S. Bank National
Association, as trustee (the "Trustee"), of the PNC Mortgage Securities Corp.
Mortgage Pass-Through Certificates, Series 1998-4.

          Section 2. Representations and Warranties of the Purchaser. In
connection with the proposed transfer, the Purchaser represents and warrants to
PNC and the Trustee that:

          (a)  The Purchaser is duly organized, validly existing and in good
standing under the laws of the jurisdiction in which the Purchaser is organized,
is authorized to invest in the Purchased Certificates, and to enter into this
Agreement, and duly executed and delivered this Agreement;

          (b)  The Purchaser is acquiring the Purchased Certificates for its own
account as principal and not with a view to the distribution thereof, in whole
or in part;

          (c)  The Purchaser is an "accredited investor" as such term is defined
in paragraph (a)(1), (a)(2), (a)(3), (a)(7) or (a)(8) of Section 501 of
Regulation D under the Securities Act of 1933, as amended (the "Act"), has
knowledge of financial and business matters and is capable of evaluating the
merits and risks of an investment in the Purchased Certificates; the Purchaser
has sought such accounting, legal and tax advice as it has considered necessary
to make an informed investment decision; and the Purchaser is able to bear the
economic risk of an investment in the Purchased Certificates and can afford a
complete loss of such investment;

          (d)  The Purchaser is not affiliated with the Trustee;

          (e)  The Purchaser confirms that PNC has made available to the
Purchaser the opportunity to ask questions of, and receive answers from PNC
concerning the trust funds created pursuant

                                         G-1

<PAGE>

to the Pooling Agreement (the "Trust Funds"), the purchase by the Purchaser of
the Purchased Certificates and all matters relating thereto that PNC possesses
or can acquire without unreasonable effort or expense; and

          (f)  If applicable, the Purchaser has complied, and will continue to
comply, with the guidelines established by Thrift Bulletin 12 issued December
13, 1988, by the Office of Regulatory Activities of the Federal Home Loan Bank
System; and

          (g)  The Purchaser will provide the Trustee and the Master Servicer
with affidavits substantially in the form of Exhibit A attached hereto.

          Section 3.Transfer of Purchased Certificates.

          (a)  The Purchaser understands that the Purchased Certificates have
not been registered under the Act, or any state securities laws and that no
transfer may be made unless the Purchased Certificates are registered under the
Act and under applicable state law or unless an exemption from registration is
available. The Purchaser further understands that neither PNC nor the Trust
Funds are under any obligation to register the Purchased Certificates or make an
exemption available. In the event that such a transfer is to be made within two
years from the Closing Date without registration under the Act or applicable
state securities laws, (i) the Trustee shall require, in order to assure
compliance with such laws, that the Certificateholder's prospective transferee
each certify to PNC and the Trustee as to the factual basis for the registration
or qualification exemption relied upon, and (ii) the Trustee or PNC may require
an Opinion of Counsel that such transfer may be made pursuant to an exemption
from the Act and state securities laws, which Opinion of Counsel shall not be an
expense of the Trustee or PNC. Any such Certificateholder desiring to effect
such transfer shall, and does hereby agree to, indemnify the Trustee and PNC
against any liability that may result if the transfer is not so exempt or is not
made in accordance with such federal and state laws.

          (b)  No transfer of a Purchased Certificate shall be made unless the
transferee provides PNC and the Trustee with (i) a Transferee's Agreement,
substantially in the form of this Agreement, and (ii) either (a) an affidavit
substantially in the form of Exhibit A hereto that the proposed transferee (x)
is not an employee benefit plan or other plan or arrangement subject to the
prohibited transaction provisions of ERISA or Section 4975 of the Internal
Revenue Code of 1986, as amended, or comparable provisions of any subsequent
enactments (a "Plan"), a trustee of any Plan, or any other Person who is using
the "plan assets" of any Plan to effect such acquisition or (y) is an insurance
company, the source of funds to be used by it to purchase the Purchased
Certificates is an "insurance company general account" (within the meaning of
Department of Labor Prohibited Transaction Class Exemption ("PTCE") 95-60), and
the purchase is being made in reliance upon the availability of the exemptive
relief afforded under Sections I and III of PTCE 95-60, or (b) a Benefit Plan
Opinion (as defined in Exhibit A hereto).

          (c)  The Purchaser acknowledges that its Purchased Certificates bear a
legend setting forth the applicable restrictions on transfer.

                                         G-2

<PAGE>

          IN WITNESS WHEREOF, the undersigned has caused this Agreement to be
validly executed by its duly authorized representative as of the day and the
year first above written.

                                   [Purchaser]



                                   By:
                                        -------------------------------------
                                     Its:


                                         G-3


<PAGE>

                           Exhibit A to Form of Transferee Agreement (Exhibit G)

                           PNC MORTGAGE SECURITIES CORP.

                               BENEFIT PLAN AFFIDAVIT

RE:  PNC MORTGAGE SECURITIES CORP.

     MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1998-4
     (THE "TRUST") CLASS [     ] CERTIFICATES
     (THE "PURCHASED CERTIFICATES")

     Under penalties of perjury, I, _____________________, declare that, to the
best of my knowledge and belief, the following representations are true, correct
and complete; and

          1.   That I am the _______________ of __________________ (the
"Purchaser"), whose taxpayer identification number is  ___________, and on
behalf of which I have the authority to make this affidavit.

          2.   That the Purchaser is acquiring a Purchased Certificate
representing an interest in the Trust Funds.

          3.   That the Purchaser (i) is not an employee benefit plan or other
plan or arrangement subject to the prohibited transaction provisions of the
Employee Retirement Income Security Act of 1974, as amended ("ERISA") or Section
4975 of the Internal Revenue Code of 1986, as amended (the "Code"), or
comparable provisions of any subsequent enactments (a "Plan"), a trustee of any
Plan, or any other Person who is using the "plan assets" of any Plan to effect
such acquisition, (ii) has provided a "Benefit Plan Opinion" satisfactory to PNC
Mortgage Securities Corp. (the "Company") and the Trustee of the Trust Funds or
(iii) is an insurance company, the source of funds to be used by it to purchase
the Purchased Certificates is an "insurance company general account" (within the
meaning of Department of Labor Prohibited Transaction Class Exemption ("PTCE")
95-60), and the purchase is being made in reliance upon the availability of the
exemptive relief afforded under Sections I and III of PTCE 95-60. A Benefit Plan
Opinion is an opinion of counsel to the effect that the proposed transfer (a) is
permissible under applicable law, (b) will not constitute or result in a
non-exempt prohibited transaction under Section 406 of ERISA or Section 4975 of
the Code, and (c) will not subject the Trustee, the Master Servicer or the
Company to any obligation or liability (including obligations or liabilities
under Section 406 of ERISA or Section 4975 of the Code) in addition to those
undertaken in this Agreement, which Benefit Plan Opinion shall not be an expense
of the Trustee, the Master Servicer or the Company.

          IN WITNESS WHEREOF, the Purchaser has caused this instrument to be
duly executed on its behalf, by its duly authorized officer this _____ day of
__________________, 199__.

[Purchaser]

By:
   ----------------------
   Its:

                                         G-4

<PAGE>

          Personally appeared before me ______________________, known or proved
to me to be the same person who executed the foregoing instrument and to be a
________________ of the Purchaser, and acknowledged to me that (s)he executed
the same as his/her free act and deed and as the free act and deed of the
Purchaser.

          SUBSCRIBED and SWORN to before me this day of ____________, 19__.


                                        ---------------------------------------
                                                  Notary Public

                                         G-5

<PAGE>

                                                                      Exhibit H

                     FORM OF ADDITIONAL MATTER INCORPORATED INTO
         THE FORM OF THE CERTIFICATES (OTHER THAN THE CLASS R-1 CERTIFICATES)

     This Certificate does not represent an obligation of or interest in PNC
Mortgage Securities Corp. or any of its affiliates, including PNC Bank Corp.
Neither this Certificate nor the underlying Mortgage Loans are guaranteed by any
agency or instrumentality of the United States.

     This certifies that the above-named Registered Owner is the registered
owner of certain interests in a trust fund (the "REMIC II Trust Fund") whose
assets consist of interests in a trust fund (the "REMIC I Trust Fund") whose
assets consist of, among other things, a pool (the "Mortgage Pool") of
conventional one- to four-family mortgage loans (the "Mortgage Loans"), formed
and administered by PNC Mortgage Securities Corp. (the "Company"), which term
includes any successor entity under the Pooling Agreement referred to below. The
Mortgage Pool was created pursuant to a Pooling and Servicing Agreement, dated
as of the Cut-Off Date stated above (the "Pooling Agreement"), between the
Company and U.S. Bank National Association, as Trustee (the "Trustee"), a
summary of certain of the pertinent provisions of which is set forth hereafter.
To the extent not defined herein, the capitalized terms used herein have the
meanings assigned in the Pooling Agreement. Nothing herein shall be deemed
inconsistent with such meanings, and in the event of any conflict between the
Pooling Agreement and the terms of this Certificate, the Pooling Agreement shall
control. This Certificate is issued under and is subject to the terms,
provisions and conditions of the Pooling Agreement, to which Pooling Agreement
the Holder of this Certificate, by virtue of the acceptance hereof, assents and
by which such Holder is bound.

     Distributions will be made, pursuant to the Pooling Agreement, on the 25th
day of each month or, if such 25th day is not a Business Day, the Business Day
immediately following (the "Distribution Date"), commencing on the first
Distribution Date specified above, to the Person in whose name this Certificate
is registered at the close of business on the last day (or if such last day is
not a Business Day, the Business Day immediately preceding such last day) of the
month immediately preceding the month of such distribution (the "Record Date"),
to the extent of such Certificateholder's Percentage Interest represented by
this Certificate in the portion of the REMIC II Available Distribution Amount
for such Distribution Date then distributable on the Certificates of this Class,
as specified in Section 4.04 of the Pooling Agreement.

     Distributions on this Certificate will be made by the Trustee by wire
transfer or check mailed to the address of the Person entitled thereto, as such
name and address shall appear on the Certificate Register. Notwithstanding the
above, the final distribution on this Certificate will be made after due notice
by the Trustee of the pendency of such distribution and only upon presentation
and surrender of this Certificate to the Certificate Registrar.

     Reference is hereby made to the further provisions of this Certificate set
forth below, which further provisions shall for all purposes have the same
effect as if set forth at this place.

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


                                         H-1

<PAGE>

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

                                   U.S. BANK NATIONAL ASSOCIATION, as Trustee


                                   By:
                                      ---------------------------------------



                     (TRUSTEE'S CERTIFICATE OF AUTHENTICATION)

This is one of the Certificates referred to in the within-mentioned Pooling
Agreement.

U.S. BANK NATIONAL ASSOCIATION,
as Trustee


By:
    ----------------------
Dated:
      --------------------

                                         H-2

<PAGE>

                            PNC MORTGAGE SECURITIES CORP.
                          MORTGAGE PASS-THROUGH CERTIFICATE

     This Certificate is one of a duly authorized issue of Certificates
designated as Mortgage Pass-Through Certificates of the Series and Class
specified hereon (herein called the "Certificates") and representing certain
interests in the REMIC II Trust Fund.

     The Certificates do not represent an obligation of, or an interest in, the
Company or any of its affiliates and are not insured or guaranteed by any
governmental agency. The Certificates are limited in right of payment to certain
collections and recoveries respecting the Mortgage Loans, all as more
specifically set forth herein and in the Pooling Agreement. In the event funds
are advanced with respect to any Mortgage Loan, such advance is reimbursable to
the Master Servicer from the related recoveries on such Mortgage Loan or from
other cash deposited in the Certificate Account to the extent that such advance
is not otherwise recoverable.

     As provided in the Pooling Agreement, withdrawals from the Certificate
Account may be made from time to time for purposes other than distributions to
Certificateholders, such purposes including reimbursement to the Master Servicer
of advances made, or certain expenses incurred, by it.

     The Pooling Agreement permits, with certain exceptions therein provided,
the amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Certificateholders under the Pooling Agreement at
any time by the Company, the Master Servicer and the Trustee with the consent of
the Holders of the Certificates evidencing Percentage Interests aggregating not
less than 66% of the REMIC II Trust Fund. For the purposes of such provision and
except as provided below, voting rights relating to 100% of the Aggregate
Certificate Principal Balance will be allocated pro rata (by Certificate
Principal Balance) among such Certificates. Any such consent by the Holder of
this Certificate shall be conclusive and binding on such Holder and upon all
future Holders of this Certificate and of any Certificate issued upon the
transfer hereof or in exchange herefor or in lieu hereof whether or not notation
of such consent is made upon this Certificate. The Pooling Agreement also
permits the amendment thereof, in certain limited circumstances, without the
consent of the Holders of any of the Certificates.

     As provided in the Pooling Agreement and subject to certain limitations
therein set forth, the transfer of this Certificate is registrable in the
Certificate Register upon surrender of this Certificate for registration of
transfer at the offices of the Certificate Registrar or the office maintained by
the Trustee in the City and State of New York, duly endorsed by, or accompanied
by an assignment in the form below or other written instrument of transfer in
form satisfactory to the Trustee or any Authenticating Agent duly executed by,
the Holder hereof or such Holder's attorney duly authorized in writing, and
thereupon one or more new Certificates of Authorized Denominations evidencing
the same Percentage Interest set forth hereinabove will be issued to the
designated transferee or transferees.

     No transfer of a Certificate will be made unless such transfer is exempt
from or is made in accordance with the registration requirements of the
Securities Act of 1933, as amended (the "Securities Act") and any applicable
state securities laws. In the event that a transfer is to be made without
registration or qualification under applicable laws, (i) in the event such
transfer is made pursuant to Rule 144A under the Securities Act, the Company and
the Trustee shall require the transferee to execute an investment letter in
substantially the form attached as Exhibit L to the Pooling Agreement, which
investment letter shall not be an expense of the Company, the Master Servicer or
the Trustee and (ii) in the event that such a transfer is not made pursuant to
Rule 144A under the Securities Act, the Company may require an Opinion of
Counsel satisfactory to the Company that such transfer may be made without such
registration or

                                         H-3

<PAGE>

qualification, which Opinion of Counsel shall not be an expense of the Company,
the Master Servicer or the Trustee. Neither the Company nor the Trustee will
register the Certificate under the Securities Act, qualify the Certificate under
any state securities law or provide registration rights to any purchaser. Any
Holder desiring to effect such transfer shall, and does hereby agree to,
indemnify the Trustee, the Company and the Master Servicer against any liability
that may result if the transfer is not so exempt or is not made in accordance
with such federal and state laws.

     The Certificates are issuable only as registered Certificates without
coupons in Authorized Denominations specified in the Pooling Agreement. As
provided in the Pooling Agreement and subject to certain limitations therein set
forth, Certificates are exchangeable for new Certificates of Authorized
Denominations evidencing the same aggregate interest in the portion of the REMIC
II Available Distribution Amount distributable on this Class of Certificate, as
requested by the Holder surrendering the same.

     A reasonable service charge may be made for any such registration of
transfer or exchange, and the Trustee may require payment of a sum sufficient to
cover any tax or other governmental charge payable in connection therewith.

     The Company, the Trustee and the Certificate Registrar and any agent of the
Company, the Trustee or the Certificate Registrar may treat the Person in whose
name this Certificate is registered as the owner hereof for all purposes, and
neither the Company, the Trustee, the Certificate Registrar nor any such agent
shall be affected by notice to the contrary.

     The obligations created by the Pooling Agreement and the REMIC II Trust
Fund created thereby shall terminate upon (i) the later of the maturity or other
liquidation (including repurchase by the Company) of the last Mortgage Loan
remaining in the REMIC I Trust Fund or the disposition of all property acquired
upon foreclosure or deed in lieu of foreclosure of any Mortgage Loan, and (ii)
the payment to Certificateholders of all amounts held by the Trustee and
required to be paid to them pursuant to the Pooling Agreement. In the event that
the Company repurchases any Mortgage Loan pursuant to the Pooling Agreement,
such Pooling Agreement generally requires that the Trustee distribute to the
Certificateholders in the aggregate an amount equal to 100% of the unpaid
Principal Balance of such Mortgage Loan, plus accrued interest at the applicable
Pass-Through Rate to the next scheduled Due Date for the Mortgage Loan. The
Pooling Agreement permits, but does not require, the Company to repurchase from
the REMIC I Trust Fund all Mortgage Loans at the time subject thereto and all
property acquired in respect of any Mortgage Loan upon payment to the
Certificateholders of the amounts specified in the Pooling Agreement. The
exercise of such right will effect early retirement of the Certificates, the
Company's right to repurchase being subject to the aggregate unpaid Principal
Balance of the Mortgage Loans at the time of repurchase being less than five
percent (5%) of the aggregate unpaid Principal Balance of the Mortgage Loans as
of the Cut-Off Date.

                                         H-4

<PAGE>

                                     ASSIGNMENT


     FOR VALUE RECEIVED the undersigned hereby sell(s) and assign(s) and
transfer(s) unto
                 ---------------------------------------------------------------
- --------------------------------------------------------------------------------
(Please print or typewrite name and address, including postal zip code of
assignee. Please insert social security or other identifying number of
assignee.)

the within Mortgage Pass-Through Certificate and hereby irrevocably constitutes
and appoints

- --------------------------------------------------------------------------------
Attorney to transfer said Certificate on the Certificate Register, with full
power of substitution in the premises.

Dated:
       -------------          ------------------------------------------------
                              Signature Guaranteed

                              -------------------------------------------------
                              NOTICE:   The signature to this assignment must
                                        correspond with the name as written upon
                                        the face of the within instrument in
                                        every particular, without alteration or
                                        enlargement or any change whatever.
                                        This Certificate does not represent an
                                        obligation of or an interest in PNC
                                        Mortgage Securities Corp. or any of its
                                        affiliates, including PNC Bank Corp.
                                        Neither this Certificate nor the
                                        underlying Mortgage Loans are guaranteed
                                        by any agency or instrumentality of the
                                        United States.

                                         H-5

<PAGE>


                                                                      Exhibit I


                               TRANSFEROR CERTIFICATE

                                       [Date]

U.S. Bank National Association, as Trustee
180 East 5th Street, SPFT0210
St. Paul, MN 55101
Attn:  Structured Finance

     RE:       PNC MORTGAGE SECURITIES CORP. MORTGAGE PASS-THROUGH
               CERTIFICATES, SERIES 1998-4, CLASS [R-1] [R-2]

Ladies and Gentlemen:

     This letter is delivered to you in connection with the sale from _________
(the "Seller") to _________________ (the "Purchaser") of $_____________________
initial Certificate Principal Balance of Mortgage Pass-Through Certificates,
Series 1998-4, Class [R-1][R-2] (the "Certificate"), pursuant to Section 5.01 of
the Pooling and Servicing Agreement (the "Pooling Agreement"), dated as of April
1, 1998 among PNC Mortgage Securities Corp., as depositor and master servicer
(the "Company") and U.S. Bank National Association, as trustee (the "Trustee").
All terms used herein and not otherwise defined shall have the meanings set
forth in the Pooling Agreement. The Seller hereby certifies, represents and
warrants to, and covenants with, the Company and the Trustee that:

     1.   No purpose of the Seller relating to the sale of the Certificate by
the Seller to the Purchaser is or will be to enable the Seller to impede the
assessment or collection of tax.

     2.   The Seller understands that the Purchaser has delivered to the Trustee
and the Company a transferee affidavit and agreement in the form attached to the
Pooling Agreement as Exhibit J. The Seller does not know or believe that any
representation contained therein is false.

     3.   The Seller has no actual knowledge that the proposed Transferee is not
a Permitted Transferee.

     4.   The Seller has no actual knowledge that the Purchaser would be
unwilling or unable to pay taxes due on its share of the taxable income
attributable to the Certificates.

     5.   The Seller has conducted a reasonable investigation of the financial
condition of the Purchaser and, as a result of the investigation, found that the
Purchaser has historically paid its debts as they came due, and found no
significant evidence to indicate that the Purchaser will not continue to pay its
debts as they come due in the future.


                                         I-1

<PAGE>

     6.   The Purchaser has represented to the Seller that, if the Certificates
constitute a noneconomic residual interest, it (i) understands that as holder of
a noneconomic residual interest it may incur tax liabilities in excess of any
cash flows generated by the interest, and (ii) intends to pay taxes associated
with its holding of the Certificates as they become due.

                                        Very truly yours,


                                        [Seller]

                                        By:
                                             ----------------------------------
                                             Name:
                                                  -----------------------------
                                             Title:
                                                    ---------------------------

                                         I-2

<PAGE>

                                                                      Exhibit J

                         TRANSFEREE AFFIDAVIT AND AGREEMENT


STATE OF       )
               )   ss:
COUNTY OF      )


          [NAME OF OFFICER], being first duly sworn, deposes and says:

          1.   That he is [Title of Officer] of [Name of Owner] (record or
beneficial owner of the Class [R-1][R-2] Certificate (the "Owner")), a [savings
institution] [corporation] duly organized and existing under the laws of [the
State of _________________] [the United States], on behalf of which he makes
this affidavit and agreement.

          2.   That the Owner (i) is not and will not be a "disqualified
organization" as of [date of transfer] within the meaning of Section 860E(e)(5)
of the Internal Revenue Code of 1986, as amended (the "Code") and will endeavor
to remain other than a disqualified organization for so long as it retains its
ownership interest in the Class [R-1][R-2] Certificates, and (ii) is acquiring
the Class [R-1][R-2] Certificates for its own account or for the account of
another Owner from which it has received an affidavit and agreement in
substantially the same form as this affidavit and agreement. (For this purpose,
a disqualified organization" means the United States, any state or political
subdivision thereof, or any agency or instrumentality of any of the foregoing
(other than an instrumentality all of the activities of which are subject to tax
and, except for the Federal Home Loan Mortgage Corporation, a majority of whose
board of directors is not selected by any such governmental entity, or any
foreign government or international organization, or any agency or
instrumentality of such foreign government or organization, any rural electric
or telephone cooperative, or any organization (other than certain farmers'
cooperatives) that is generally exempt from federal income tax unless such
organization is subject to the tax on unrelated business taxable income).

          3.   That the Owner is aware (i) of the tax that would be imposed on
transfers of the Class [R-1][R-2] Certificates after March 31, 1988; (ii) that
such tax would be on the transferor, or, if such transfer is through an agent
(which person includes a broker, nominee or middle-man) for a disqualified
organization, on the agent; (iii) that the person other-wise liable for the tax
shall be relieved of liability for the tax if the transferee furnishes to such
person an affidavit that the transferee is not a disqualified organization and,
at the time of transfer, such person does not have actual knowledge that the
affidavit is false; and (iv) that the Class [R-1][R-2] Certificates may be a
"noneconomic residual interest" within the meaning of Treasury regulations
promulgated pursuant to the Code and that the transferor of a noneconomic
residual interest will remain liable for any taxes due with respect to the
income on such residual interest, if a significant purpose of the transfer was
to enable the transferor to impede the assessment or collection of tax.

          4.   That the Owner is aware of the tax imposed on a "pass-through
entity" holding the Class [R-1][R-2] Certificates if at any time during the
taxable year of the pass-through entity a disqualified


                                         J-1

<PAGE>

organization is the record holder of an interest in such entity. (For this
purpose, a "pass through entity" includes a regulated investment company, a real
estate investment trust or common trust fund, a partnership, trust or estate,
and certain cooperatives.)

          5.   That the Owner is aware that the Trustee will not register the
Transfer of the Class [R-1][R-2] Certificates unless the transferee, or the
transferees' agent, delivers to it an affidavit and agreement, among other
things, in substantially the same form as this affidavit and agreement. The
Owner expressly agrees that it will not consummate any such transfer if it knows
or believes that any of the representations contained in such affidavit and
agreement are false.

          6.   That the Owner has reviewed the restrictions set forth on the
face of the Class [R-1][R-2] Certificates and the provisions of Section 5.01 of
the Pooling Agreement under which the Class [R-1][R-2] Certificates were issued
(in particular, clauses (iii)(A) and (iii)(B) of Section 5.01(c) which authorize
the Trustee to deliver payments to a person other than the Owner and negotiate a
mandatory sale by the Trustee in the event the Owner holds such Certificates in
violation of Section 5.01). The Owner expressly agrees to be bound by and to
comply with such restrictions and provisions.

          7.   That the Owner consents to any additional restrictions or
arrangements that shall be deemed necessary upon advice of counsel to constitute
a reasonable arrangement to ensure that the Class [R-1][R-2] Certificates will
only be owned, directly or indirectly, by an Owner that is not a disqualified
organization.

          8.   The Owner's Taxpayer Identification Number is ________________.

          9.   That no purpose of the Owner relating to the purchase of the
Class [R-1][R-2] Certificates by the Owner is or will be to enable the
transferor to impede the assessment or collection of tax.

          10.  That the Owner has no present knowledge or expectation that it
will be unable to pay any United States taxes owed by it so long as any of the
Certificates remain outstanding.

          11.  That the Owner has no present knowledge or expectation that it
will become insolvent or subject to a bankruptcy proceeding for so long as any
of the Certificates remain outstanding.

          12.  That no purpose of the Owner relating to any sale of the Class
[R-1][R-2] Certificates by the Owner will be to impede the assessment or
collection of tax.

          13.  The Owner is a citizen or resident of the United States, a
corporation, partnership or other entity created or organized in, or under the
laws of, the United States or any political subdivision thereof, or an estate or
trust whose income from sources without the United States is includible in gross
income for United States federal income tax purposes regardless of its
connection with the conduct of a trade or business within the United States.

          14.  The Owner hereby agrees to cooperate with the Company and to take
any action required of it by the Code or Treasury regulations thereunder
(whether now or hereafter promulgated) in order to create or maintain the REMIC
status of the REMIC I Trust Fund and the REMIC II Trust Fund (the "Trust
Funds").

          15.  The Owner hereby agrees that it will not take any action that
could endanger the REMIC status of the Trust Funds or result in the imposition
of tax on the Trust Funds unless counsel for,

                                         J-2

<PAGE>

or acceptable to, the Company has provided an opinion that such action will not
result in the loss of such REMIC status or the imposition of such tax, as
applicable.

          16.  The Owner as transferee of the Class [R-1][R-2] Certificates has
represented to their transferor that, if the Class [R-1][R-2] Certificates
constitute a noneconomic residual interest, the Owner (i) understands that as
holder of a noneconomic residual interest it may incur tax liabilities in excess
of any cash flows generated by the interest, and (ii) intends to pay taxes
associated with its holding of the Class [R-1][R-2] Certificates as they become
due.

          IN WITNESS WHEREOF, the Owner has caused this instrument to be
executed on its behalf, pursuant to the authority of its Board of Directors, by
its [Title of Officer] and its corporate seal to be hereunto attached, attested
by its [Assistant] Secretary, this           day of          , 19 __ .

                                        [Name of Owner]

                                        By:
                                           ------------------------------------
                                                  [Name of Officer]
                                                  [Title of Officer]

[Corporate Seal]

ATTEST:



[Assistant] Secretary

     Personally appeared before me the above-named [Name of Officer], known or
proved to me to be the same person who executed the foregoing instrument and to
be the [Title of Officer] of the Owner, and Acknowledged to me that he executed
the same as his free act and deed and the free act and deed of the Owner.

     Subscribed and sworn before me this ___ day of __________________, 19__.



                                        NOTARY PUBLIC


                                        COUNTY OF
                                        STATE OF
                                        My Commission expires the     day
                                        of         , 19
                                           --------     ----

<PAGE>

                                                                       Exhibit K

                                                                      [Reserved]


                                         K-1


<PAGE>

                                                                       Exhibit L


                    [FORM OF RULE 144A INVESTMENT REPRESENTATION]

               Description of Rule 144A Securities, including numbers:


                                  ------------------

                                  ------------------

                                  ------------------

                                  ------------------

     The undersigned  seller, as registered holder (the "Seller"), intends to
transfer the Rule 144A Securities described above to the undersigned buyer (the
"Buyer").

     1.   In connection with such transfer and in accordance with the agreements
pursuant to which the Rule 144A Securities were issued, the Seller hereby
certifies the following facts: Neither the Seller nor anyone acting on its
behalf has offered, transferred, pledged, sold or otherwise disposed of the Rule
144A Securities, any interest in the Rule 144A Securities or any other similar
security to, or solicited any offer to buy or accept a transfer, pledge or other
disposition of the Rule 144A Securities, any interest in the Rule 144A
Securities or any other similar security from, or otherwise approached or
negotiated with respect to the Rule 144A Securities, any interest in the Rule
144A Securities or any other similar security with, any person in any manner, or
made any general solicitation by means of general advertising or in any other
manner, or taken any other action, that would constitute a distribution of the
Rule 144A Securities under the Securities Act of 1933, as amended (the "1933
Act"), or that would render the disposition of the Rule 144A Securities a
violation of Section 5 of the 1933 Act or require registration pursuant thereto,
and that the Seller has not offered the Rule 144A Securities to any person other
than the Buyer or another "qualified institutional buyer" as defined in Rule
144A under the 1933 Act.

     2.   The Buyer warrants and represents to, and covenants with, the Seller,
the Trustee and the Master Servicer (as defined in the Pooling and Servicing
Agreement (the "Agreement") dated as of April 1, 1998 between PNC Mortgage
Securities Corp., as Depositor and Master Servicer and U.S. Bank National
Association, as Trustee) pursuant to Section 5.01(f) of the Agreement, as
follows:

          a.   The Buyer understands that the Rule 144A Securities have not been
     registered under the 1933 Act or the securities laws of any state.

          b.   The Buyer considers itself a substantial, sophisticated
     institutional investor having such knowledge and experience in financial
     and business matters that it is capable of evaluating the merits and risks
     of investment in the Rule 144A Securities.

          c.   The Buyer has received and reviewed the Private Placement
     Memorandum dated as of March __, 1998 relating to the Rule 144A Securities
     and has been furnished with all information regarding the Rule 144A
     Securities that it has requested from the Seller, the Trustee, the Company
     or the Master Servicer.

                                         L-1

<PAGE>


          d.   Neither the Buyer nor anyone acting on its behalf has offered,
     transferred, pledged, sold or otherwise disposed of the Rule 144A
     Securities, any interest in the Rule 144A Securities or any other similar
     security to, or solicited any offer to buy or accept a transfer, pledge or
     other disposition of the Rule 144A Securities, any interest in the Rule
     144A Securities or any other similar security from, or otherwise approached
     or negotiated with respect to the Rule 144A Securities, any interest in the
     Rule 144A Securities or any other similar security with, any person in any
     manner, or made any general solicitation by means of general advertising or
     in any other manner, or taken any other action, that would constitute a
     distribution of the Rule 144A Securities under the 1933 Act or that would
     render the disposition of the Rule 144A Securities a violation of Section 5
     of the 1933 Act or require registration pursuant thereto, nor will it act,
     nor has it authorized or will it authorize any person to act, in such
     manner with respect to the Rule 144A Securities.

          e.   The Buyer is a "qualified institutional buyer" as that term is
     defined in Rule 144A under the 1933 Act and has (1) completed either of the
     forms of certification to that effect attached hereto as Annex 1 or Annex
     2, or (2) obtained the waiver of the Company with respect to Annex 1 and
     Annex 2 pursuant to Section 5.01(f) of the Agreement. The Buyer is aware
     that the sale to it is being made in reliance on Rule 144A. The Buyer is
     acquiring the Rule 144A Securities for its own account or the accounts of
     other qualified institutional buyers, understands that such Rule 144A
     Securities may be resold, pledged or transferred only (i) to a person
     reasonably believed to be a qualified institutional buyer that purchases
     for its own account or for the account of a qualified institutional buyer
     to whom notice is given that the resale, pledge or transfer is being made
     in reliance on Rule 144A, or (ii) pursuant to another exemption from
     registration under the 1933 Act.

          f.   The Buyer is not affiliated with (i) the Trustee or (ii) any
     Rating Agency that rated the Rule 144A Securities.

          g.   If applicable, the Buyer has complied, and will continue to
     comply, with the guidelines established by Thrift Bulletin 12 issued
     December 13, 1988, by the Office of Regulatory Activities of the Federal
     Home Loan Bank System.

     [Required only in the case of a transfer of a Subordinate Certificate] [3.
The Buyer warrants and represents to, and covenants with, the Trustee, the
Master Servicer and the Company that (1) the Buyer is not an employee benefit
plan (within the meaning of Section 3(3) of the Employee Retirement Income
Security Act of 1974, as amended ("ERISA")), subject to the prohibited
transaction provisions of ERISA ("Plan"), or a plan (within the meaning of
Section 4975(e)(1) of the Internal Revenue Code of 1986 ("Code")) subject to
Section 4975 of the Code (also a "Plan"), and the Buyer is not directly or
indirectly purchasing the Rule 144A Securities on behalf of, as investment
manager of, as named fiduciary of, as trustee of, or with "plan assets" of any
Plan, (2) the Buyer's purchase of the Rule 144A Securities is permissible under
applicable law, will not constitute or result in a non-exempt prohibited
transaction under Section 406 of ERISA or Section 4975 of the Code and will not
subject the Trustee, the Master Servicer or the Company to any obligation or
liability (including obligations or liabilities under Section 406 of ERISA or
Section 4975 of the Code) in addition to those undertaken in this Agreement and
the Buyer has provided an Opinion of Counsel to such effect in accordance with
Section 5.01(d) of the Agreement or (3) the Buyer is an insurance company, the
source of funds to be used by it to purchase the Rule 144A Securities is an
"insurance company general account" (within the meaning of Department of Labor
Prohibited Transaction Class Exemption ("PTCE") 95-60), and the purchase is
being made in reliance upon the availability of the exemptive relief afforded
under Sections I and III of PTCE 95-60.]

                                         L-2


<PAGE>

     4.   This document may be executed in one or more counterparts and by the
different parties hereto on separate counterparts, each of which, when so
executed, shall be deemed to be an original; such counterparts, together, shall
constitute one and the same document.

     IN WITNESS WHEREOF, each of the parties has executed this document as of
the date set forth below.


- ------------------------------------         ---------------------------------
          Print Name of Seller                    Print Name of Buyer

By:                                          By:
   ---------------------------------            ------------------------------
     Name:                                        Name:
     Title:                                       Title:


Taxpayer Identification:                     Taxpayer Identification:
                         -----------                                  --------
No.:                                         No.:
     -------------------------------              ----------------------------
Date:                                        Date:
     -------------------------------              ----------------------------

                                         L-3

<PAGE>

                                                          Annex 1 to Exhibit L

              QUALIFIED INSTITUTIONAL BUYER STATUS UNDER SEC RULE 144A

              [For Buyers Other Than Registered Investment Companies]


     The undersigned hereby certifies as follows in connection with the Rule
144A Investment Representation to which this Certification is attached:

     1.   As indicated below, the undersigned is the President, Chief Financial
Officer, Senior Vice President or other executive officer of the Buyer.

     2.   In connection with purchases by the Buyer, the Buyer is a "qualified
institutional buyer" as that term is defined in Rule 144A under the Securities
Act of 1933 ("Rule 144A") because (i) the Buyer owned and/or invested on a
discretionary basis $______________________(1)in securities (except for the
excluded securities referred to below) as of the end of the Buyer's most recent
fiscal year (such amount being calculated in accordance with Rule 144A) and
(ii) the Buyer satisfies the criteria in the category marked below.

     ___  CORPORATION, ETC. The Buyer is a corporation (other than a bank,
     savings and loan association or similar institution), Massachusetts or
     similar business trust, partnership, or charitable organization described
     in Section 501(c)(3) of the Internal Revenue Code.

     ___  BANK. The Buyer (a) is a national bank or banking institution
     organized under the laws of any State, territory or the District of
     Columbia, the business of which is substantially confined to banking and is
     supervised by the State or territorial banking commission or similar
     official or is a foreign bank or equivalent institution, and (b) has an
     audited net worth of at least $25,000,000 as demonstrated in its latest
     annual financial statements, A COPY OF WHICH IS ATTACHED HERETO.

     ___  SAVINGS AND LOAN. The Buyer (a) is a savings and loan association,
     building and loan association, cooperative bank, homestead association or
     similar institution, which is supervised and examined by a State or Federal
     authority having supervision over any such institutions or is a foreign
     savings and loan association or equivalent institution and (b) has an
     audited net worth of at least $25,000,000 as demonstrated in its latest
     annual financial statements.

     ___  BROKER-DEALER. The Buyer is a dealer registered pursuant to Section 15
     of the Securities Exchange Act of 1934.

     ___  INSURANCE COMPANY. The Buyer is an insurance company whose primary and
     predominant business activity is the writing of insurance or the reinsuring
     of risks underwritten by insurance companies and which is subject to
     supervision by the insurance commissioner or a similar official or agency
     of a State or territory or the District of Columbia.

- -----------------------
(1) Buyer must own and/or invest on a discretionary basis at lest $100,000,000
in securities unless Buyer is a dealer, and, in that case, Buyer must own and/or
invest on a discretionary basis at least $10,000,000 in securities.

                                        L-1-1

<PAGE>

     ___  STATE OR LOCAL PLAN. The Buyer is a plan established and maintained by
     a State, its political subdivisions, or any agency or instrumentality of
     the State or its political subdivisions, for the benefit of its employees.

     ___  ERISA PLAN. The Buyer is an employee benefit plan within the meaning
     of Section 3(3) of the Employee Retirement Income Security Act of 1974, as
     amended ("ERISA") and is subject to the fiduciary responsibility provisions
     of ERISA.

     ___  INVESTMENT ADVISER. The Buyer is an investment adviser registered
     under the Investment Advisers Act of 1940.

     ___  SBIC. The Buyer is a Small Business Investment Company licensed by the
     U.S. Small Business Administration under Section 301(c) or (d) of the Small
     Business Investment Act of 1958.

     ___  BUSINESS DEVELOPMENT COMPANY. The Buyer is a business development
     company as defined in Section 202(a)(22) of the Investment Advisers Act of
     1940.

     ___  TRUST FUND. The Buyer is a trust fund whose trustee is a bank or trust
     company and whose participants are exclusively (a) plans established and
     maintained by a State, its political subdivisions, or any agency or
     instrumentality of the State or its political subdivisions, for the benefit
     of its employees, or (b) employee benefit plans within the meaning of Title
     I of the Employee Retirement Income Security Act of 1974, but is not a
     trust fund that includes as participants individual retirement accounts or
     H.R. 10 plans.

     3.   The term "SECURITIES" as used herein DOES NOT INCLUDE (i) securities
of issuers that are affiliated with the Buyer, (ii) securities that are part of
an unsold allotment to or subscription by the Buyer, if the Buyer is a dealer,
(iii) bank deposit notes and certificates of deposit, (iv) loan participations,
(v) repurchase agreements, (vi) securities owned but subject to a repurchase
agreement and (vii) currency, interest rate and commodity swaps.

     4.   For purposes of determining the aggregate amount of securities owned
and/or invested on a discretionary basis by the Buyer, the Buyer used the cost
of such securities to the Buyer and did not include any of the securities
referred to in the preceding paragraph. Further, in determining such aggregate
amount, the Buyer may have included securities owned by subsidiaries of the
Buyer,  but only if such subsidiaries are consolidated with the Buyer in its
financial statements prepared in accordance with generally accepted accounting
principles and if the investments of such subsidiaries are managed under the
Buyer's direction. However, such securities were not included if the Buyer is a
majority-owned, consolidated subsidiary of another enterprise and the Buyer is
not itself a reporting company under the Securities Exchange Act of 1934.

     5.   The Buyer acknowledges that it is familiar with Rule 144A and
understands that the seller to it and other parties related to the Certificates
are relying and will continue to rely on the statements made herein because one
or more sales to the Buyer may be in reliance on Rule 144A.

                                        L-1-2

<PAGE>

      -----         -----     Will the Buyer be purchasing the Rule 144A

             Yes         No        Securities only for the Buyer's own account?

     6.   If the answer to the foregoing question is "no", the Buyer agrees
that, in connection with any purchase of securities sold to the Buyer for the
account of a third party (including any separate account) in reliance on
Rule 144A, the Buyer will only purchase for the account of a third party that at
the time is a "qualified institutional buyer" within the meaning of Rule 144A.
In addition, the Buyer agrees that the Buyer will not purchase securities for a
third party unless the Buyer has obtained a current representation letter from
such third party or taken other appropriate steps contemplated by Rule 144A to
conclude that such third party independently meets the definition of "qualified
institutional buyer" set forth in Rule 144A.

     7.   The Buyer will notify each of the parties to which this certification
is made of any changes in the information and conclusions herein. Until such
notice is given, the Buyer's purchase of Rule 144A Securities will constitute a
reaffirmation of this certification as of the date of such purchase.


                                   --------------------------------------------
                                             Print Name of Buyer

                                   By:
                                        ---------------------------------------
                                        Name:
                                        Title:

                                   Date:
                                        ---------------------------------------

                                        L-1-3

<PAGE>

                                                           ANNEX 2 TO EXHIBIT L

              QUALIFIED INSTITUTIONAL BUYER STATUS UNDER SEC RULE 144A

               [For Buyers That Are Registered Investment Companies]


     The undersigned hereby certifies as follows in connection with the Rule
144A Investment Representation to which this Certification is attached:

     1.   As indicated below, the undersigned is the President, Chief Financial
Officer or Senior Vice President of the Buyer or, if the Buyer is a "qualified
institutional buyer" as that term is defined in Rule 144A under the Securities
Act of 1933 ("Rule 144A") because Buyer is part of a Family of Investment
Companies (as defined below), is such an officer of the Adviser.

     2.   In connection with purchases by Buyer, the Buyer is a "qualified
institutional buyer" as defined in SEC Rule 144A because (i) the Buyer is an
investment company registered under the Investment Company Act of 1940, and (ii)
as marked below, the Buyer alone, or the Buyer's Family of Investment Companies,
owned at least $100,000,000 in securities (other than the excluded securities
referred to below) as of the end of the Buyer's most recent fiscal year. For
purposes of determining the amount of securities owned by the Buyer or the
Buyer's Family of Investment Companies, the cost of such securities was used.

     ____ The Buyer owned $___________________ in securities (other than the
     excluded securities referred to below) as of the end of the Buyer's most
     recent fiscal year (such amount being calculated in accordance with Rule
     144A).

     ____ The Buyer is part of a Family of Investment Companies which owned in
     the aggregate $______________ in securities (other than the excluded
     securities referred to below) as of the end of the Buyer's most recent
     fiscal year (such amount being calculated in accordance with Rule 144A).

     3.   The term "FAMILY OF INVESTMENT COMPANIES" as used herein means two or
more registered investment companies (or series thereof) that have the same
investment adviser or investment advisers that are affiliated (by virtue of
being majority owned subsidiaries of the same parent or because one investment
adviser is a majority owned subsidiary of the other).

     4.   The term "SECURITIES" as used herein does not include (i) securities
of issuers that are affiliated with the Buyer or are part of the Buyer's Family
of Investment Companies, (ii) bank deposit notes and certificates of deposit,
(iii) loan participations, (iv) repurchase agreements, (v) securities owned but
subject to a repurchase agreement and (vi) currency, interest rate and commodity
swaps.

     5.   The Buyer is familiar with Rule 144A and understands that each of the
parties to which this certification is made are relying and will continue to
rely on the statements made herein because one or more sales to the Buyer will
be in reliance on Rule 144A. In addition, the Buyer will only purchase for the
Buyer's own account.

     6.   The undersigned will notify each of the parties to which this
certification is made of any changes in the information and conclusions herein.
Until such notice, the Buyer's purchase of Rule 144A

                                        L-2-1

<PAGE>

Securities will constitute a reaffirmation of this certification by the
undersigned as of the date of such purchase.


                                   -------------------------------------------
                                             Print Name of Buyer

                                   By:
                                        --------------------------------------
                                        Name:
                                        Title:

                                   Date:
                                        --------------------------------------

                                   IF AN ADVISER:


                                   -------------------------------------------
                                             Print Name of Buyer

                                   By:
                                        --------------------------------------
                                        Name:
                                        Title:

                                   Date:
                                        --------------------------------------

(SEAL)

                                        L-2-2

<PAGE>

                                                                     Exhibit M


                                        [Date]

[Company]

               Re:  Pooling and Servicing Agreement dated as of April 1, 1998 by
                    and between PNC Mortgage Securities Corp., as Depositor and
                    Master Servicer, and U.S. Bank National Association, as
                    Trustee, relating to PNC Mortgage Securities Corp. Mortgage
                    Pass-Through Certificates, Series 1998-4

Ladies and Gentlemen:

     In accordance with Section 2.02 of the above-captioned Pooling and
Servicing Agreement, the undersigned, as Trustee, hereby certifies that, except
as noted on the attachment hereto, as to each Mortgage Loan listed in the
Mortgage Loan Schedule (other than any Mortgage Loan paid in full or listed on
the attachment hereto) it or the Custodian on its behalf has reviewed the
documents delivered to it or to the Custodian on its behalf pursuant to Section
2.01 of the Pooling and Servicing Agreement and has determined that (i) all
documents required (in the case of instruments described in clauses (X)(vi) and
(Y)(x) of the definition of "Mortgage File," known by the Trustee to be
required) pursuant to the third paragraph of Section 2.01 of the Pooling and
Servicing Agreement have been executed and received as of the date hereof are in
its possession or in the possession of the Custodian on its behalf and (ii) all
such  documents have been executed and relate to the Mortgage Loans identified
in the Mortgage Loan Schedule. The Trustee has made no independent examination
of such documents beyond the review specifically required in the above
referenced Pooling and Servicing Agreement and has relied upon the purported
genuineness and due execution of any such documents and upon the purported
genuineness of any signature thereon. The Trustee makes no representations as
to: (i) the validity, legality, enforceability or genuineness of any of the
documents contained in each Mortgage File or any of the Mortgage Loans
identified on the Mortgage Loan Schedule, or (ii) the collectability,
insurability, effectiveness or suitability of any such Mortgage Loan.

     Capitalized words and phrases used herein shall have the respective
meanings assigned to them in the above-captioned Pooling and Servicing
Agreement.


                                   -------------------------------------------
                                   as Trustee

                                   By:
                                        --------------------------------------
                                        Name:
                                        Title:


                                         M-1



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