PNC MORTGAGE SECURITIES CORP
424B5, 1996-12-26
FINANCE SERVICES
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<PAGE>
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED NOVEMBER 21, 1996)
 
                                  PNC MORTGAGE
                                SECURITIES CORP.
                         DEPOSITOR AND MASTER SERVICER
               MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1996-4
                                  $145,240,138
                                 (APPROXIMATE)
 
  PRINCIPAL AND/OR INTEREST PAYABLE ON THE 25TH DAY OF EACH MONTH BEGINNING IN
                                  JANUARY 1997
 
THESE CERTIFICATES DO NOT REPRESENT AN OBLIGATION OF OR INTEREST IN PNC MORTGAGE
     SECURITIES CORP. OR ANY OF ITS AFFILIATES, INCLUDING PNC BANK CORP.
     NEITHER THESE CERTIFICATES NOR THE UNDERLYING MORTGAGE LOANS ARE
        GUARANTEED BY       ANY AGENCY OR INSTRUMENTALITY OF THE
                                 UNITED STATES.
 
    The Mortgage Pass-Through Certificates, Series 1996-4 (the "Certificates"),
will consist of the following twenty-three classes:(i) Class IA-1, Class IA-2
and Class IA-3 (the "Class IA Certificates"), (ii) Class IIA-1, Class IIA-2,
Class IIA-3, Class IIA-4, Class IIA-5, Class IIA-6 and Class IIA-7 (the "Class
IIA Certificates" and together with the Class IA Certificates, the "Class A
Certificates"), (iii) Class IP and Class IIP (the "Class P Certificates"), (iv)
Class IX and Class IIX (the "Class X Certificates"), (v) Class B-1, Class B-2
and Class B-3 (the "Senior Subordinate Certificates"), (vi) Class B-4, Class B-5
and Class B-6 (the "Junior Subordinate Certificates" and together with the
Senior Subordinate Certificates, the "Subordinate Certificates" or the "Class B
Certificates"), and (vii) Class R, Class R-1 and Class R-2 (the "Residual
Certificates" and together with the Class A, Class X and Class P Certificates,
the "Senior Certificates"). The Class IA, Class IP and Class IX Certificates are
sometimes referred to as the "Class I Certificates" and the Class IIA, Class IIP
and Class IIX Certificates are sometimes referred to as the "Class II
Certificates". The Class IA-3 and Class IIA-5 Certificates are sometimes
referred to as the "Lockout Certificates". The Class IIA-1 and Class IIA-2
Certificates are sometimes referred to as the "LIBOR Certificates". The Class
IIA-1 Certificates are sometimes referred to as the "Floater Certificates" and
the Class IIA-2 Certificates are sometimes referred to as the "Inverse Floater
Certificates". Only the Senior Certificates and the Senior Subordinate
Certificates (collectively, the "Offered Certificates") are offered hereby. The
Junior Subordinate Certificates are not offered hereby. It is a condition to the
issuance of the Certificates that the Senior Certificates be rated "Aaa" by
Moody's Investors Service ("Moody's") and "AAA" by Duff & Phelps Credit Rating
Co. ("DCR") and that the Class B-1 Certificates be rated not less than "Aa2" by
Moody's and "AA" by DCR, the Class B-2 Certificates be rated not less than "A2"
by Moody's and "A" by DCR and the Class B-3 Certificates be rated not less than
"Baa2" by Moody's and "BBB" by DCR. See "Certificate Ratings" herein.
 
<TABLE>
<CAPTION>
                           APPROXIMATE
                          INITIAL CLASS           REMITTANCE
                        PRINCIPAL BALANCE          RATE (1)
<S>                   <C>                     <C>
Class IA-1..........       $ 31,969,544               7.000%
Class IA-2..........          7,680,000               7.000%
Class IA-3..........          4,700,000               7.000%
Class IIA-1.........         25,494,373        Floating Rate(2)
Class IIA-2.........         --                Floating Rate(3)
Class IIA-3.........         11,164,000               7.750     %
Class IIA-4.........          3,436,000               8.000     %
Class IIA-5.........          9,658,126               8.000     %
Class IIA-6.........         22,703,372               7.250     %
Class IIA-7.........         22,703,372               7.750     %
</TABLE>
 
<TABLE>
<CAPTION>
                           APPROXIMATE
                          INITIAL CLASS           REMITTANCE
                        PRINCIPAL BALANCE          RATE (1)
<S>                   <C>                     <C>
Class IX............       $    --                    7.000%(4)
Class IIX...........            --                    8.000%(5)
Class IP............            336,248                 (6)
Class IIP...........            993,737                 (7)
Class B-1...........          1,833,840        Variable Rate(8)
Class B-2...........          1,833,840        Variable Rate(8)
Class B-3...........            733,536        Variable Rate(8)
Class R.............                 50               7.000     %
Class R-1...........                 50               7.000     %
Class R-2...........                 50               7.000     %
</TABLE>
 
                                                        (Continued on next page)
 
    The Offered Certificates are being offered by Donaldson, Lufkin & Jenrette
Securities Corporation (the "Underwriter") from time to time in negotiated
transactions or otherwise at varying prices to be determined at the time of
sale. Sales may be made to investors at the same price or at different prices.
See "Method of Distribution" herein. The aggregate proceeds to PNC Mortgage
Securities Corp. (the "Company") from the sale of the Offered Certificates,
before deducting expenses estimated to be $225,000, will be 101.656% of the
initial aggregate Certificate Principal Balance of the Offered Certificates plus
accrued interest. The difference between the aggregate purchase price for the
Offered Certificates paid to the Company and the aggregate proceeds from the
sale of the Offered Certificates realized by the Underwriter will constitute
underwriting discounts and commissions. The Company has agreed to indemnify the
Underwriter against certain liabilities, including liabilities under the
Securities Act of 1933. See "Method of Distribution" herein.
 
    SEE "RISK FACTORS" IMMEDIATELY FOLLOWING "SUMMARY INFORMATION" HEREIN AND
IMMEDIATELY FOLLOWING "SUMMARY OF PROSPECTUS" IN THE PROSPECTUS FOR A DISCUSSION
OF CERTAIN FACTORS THAT SHOULD BE CONSIDERED BEFORE PURCHASING ANY OF THE
OFFERED CERTIFICATES.
                              -------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE NOR HAS ANY
     SUCH COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
        PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
                                    OFFENSE.
                            ------------------------
 
    The Offered Certificates are offered by the Underwriter, as specified
herein, subject to receipt and acceptance by it, and subject to its right to
reject any order in whole or in part and to certain other conditions. It is
expected that delivery of the Class A Certificates will be made through the
facilities of The Depository Trust Company, and that delivery of the Residual
(other than the portions of the Class R, Class R-1 and Class R-2 Certificates
retained by the Company), Senior Subordinate, Class X and Class P Certificates
will be made at the offices of the Underwriter, on or about December 27, 1996.
(Additional cover page information is contained on the reverse side of this
page.)
 
                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION
 
          THE DATE OF THIS PROSPECTUS SUPPLEMENT IS DECEMBER 23, 1996
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
(1) INTEREST DISTRIBUTED TO THE OFFERED CERTIFICATES ON EACH DISTRIBUTION DATE
    WILL HAVE ACCRUED DURING THE PRECEDING CALENDAR MONTH AT THE APPLICABLE PER
    ANNUM REMITTANCE RATE, EXCEPT FOR (I) THE LIBOR CERTIFICATES WHICH WILL
    ACCRUE INTEREST DURING THE PERIOD FROM THE 25TH OF THE MONTH PRIOR TO EACH
    DISTRIBUTION DATE TO THE 24TH OF THE MONTH OF SUCH DISTRIBUTION DATE AND
    (II) THE CLASS P CERTIFICATES WHICH WILL NOT BE ENTITLED TO RECEIVE
    INTEREST.
 
(2) THE INITIAL REMITTANCE RATE FOR THE CLASS IIA-1 CERTIFICATES WILL BE 6.125%
    PER ANNUM. THEREAFTER, THE CLASS IIA-1 CERTIFICATES WILL ACCRUE INTEREST AT
    A PER ANNUM RATE EQUAL TO LIBOR (AS DEFINED HEREIN) PLUS 0.750%, SUBJECT TO
    A MINIMUM AND MAXIMUM REMITTANCE RATE OF 0.750% AND 9.000% PER ANNUM,
    RESPECTIVELY.
 
(3) THE INITIAL REMITTANCE RATE FOR THE CLASS IIA-2 CERTIFICATES WILL BE 2.875%
    PER ANNUM. THEREAFTER, THE CLASS IIA-2 CERTIFICATES WILL ACCRUE INTEREST AT
    A PER ANNUM RATE EQUAL TO 8.250% MINUS LIBOR, SUBJECT TO A MINIMUM AND
    MAXIMUM REMITTANCE RATE OF 0.000% AND 8.250% PER ANNUM, RESPECTIVELY. THE
    CLASS IIA-2 CERTIFICATES WILL NOT BE ENTITLED TO RECEIVE DISTRIBUTIONS OF
    PRINCIPAL AND WILL ACCRUE INTEREST ON THE CLASS IIA-2 NOTIONAL AMOUNT WHICH
    WILL EQUAL THE CLASS IIA-1 PRINCIPAL BALANCE AT THE TIME OF DETERMINATION.
 
(4) THE REMITTANCE RATE ON THE CLASS IX CERTIFICATES WILL BE 7.000% PER ANNUM.
    THE CLASS IX CERTIFICATES WILL ACCRUE INTEREST ON THE CLASS IX NOTIONAL
    AMOUNT. THE "CLASS IX NOTIONAL AMOUNT" WITH RESPECT TO ANY DISTRIBUTION DATE
    WILL EQUAL THE PRODUCT OF (X) THE AGGREGATE STATED PRINCIPAL BALANCE (AS
    DEFINED HEREIN), 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 LOANS (AS DEFINED HEREIN) HAVING PASS-THROUGH
    RATES IN EXCESS OF 7.000% PER ANNUM (THE "15-YEAR PREMIUM RATE MORTGAGE
    LOANS") AND (Y) A FRACTION, THE NUMERATOR OF WHICH IS THE WEIGHTED AVERAGE
    OF THE STRIPPED INTEREST RATES (AS DEFINED HEREIN) FOR THE 15-YEAR PREMIUM
    RATE MORTGAGE LOANS AS OF SUCH DUE DATE AND THE DENOMINATOR OF WHICH IS
    7.000%. THE CLASS IX NOTIONAL AMOUNT AS OF THE CUT-OFF DATE WILL BE
    APPROXIMATELY $2,589,942.
 
(5) THE REMITTANCE RATE ON THE CLASS IIX CERTIFICATES WILL BE 8.000% PER ANNUM.
    THE CLASS IIX CERTIFICATES WILL ACCRUE INTEREST ON THE CLASS IIX NOTIONAL
    AMOUNT. THE "CLASS IIX NOTIONAL AMOUNT" WITH RESPECT TO ANY DISTRIBUTION
    DATE WILL EQUAL THE PRODUCT OF (X) THE AGGREGATE STATED 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 LOANS (AS DEFINED HEREIN) HAVING PASS-THROUGH RATES IN EXCESS
    OF 8.000% PER ANNUM (THE "30-YEAR PREMIUM RATE MORTGAGE LOANS") AND (Y) A
    FRACTION, THE NUMERATOR OF WHICH IS THE WEIGHTED AVERAGE OF THE STRIPPED
    INTEREST RATES (AS DEFINED HEREIN) FOR THE 30-YEAR PREMIUM RATE MORTGAGE
    LOANS AS OF SUCH DUE DATE AND THE DENOMINATOR OF WHICH IS 8.000%. THE CLASS
    IIX NOTIONAL AMOUNT AS OF THE CUT-OFF DATE WILL BE APPROXIMATELY $3,122,756.
 
(6) THE CLASS IP CERTIFICATES WILL NOT BE ENTITLED TO RECEIVE DISTRIBUTIONS OF
    INTEREST.
 
(7) THE CLASS IIP CERTIFICATES WILL NOT BE ENTITLED TO RECEIVE DISTRIBUTIONS OF
    INTEREST.
 
(8) THE REMITTANCE RATE ON THE CLASS B-1, CLASS B-2 AND CLASS B-3 CERTIFICATES
    WILL EQUAL, ON ANY DISTRIBUTION DATE, THE QUOTIENT EXPRESSED AS A PERCENTAGE
    OF (A) THE SUM OF (I) THE PRODUCT OF (X) 7.000% AND (Y) THE EXCESS, IF ANY,
    OF THE AGGREGATE STATED PRINCIPAL BALANCE OF THE GROUP I LOANS, 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, AND AFTER GIVING
    EFFECT TO ANY PRINCIPAL PREPAYMENTS DISTRIBUTED ON THE PRIOR DISTRIBUTION
    DATE, OVER THE THEN OUTSTANDING AGGREGATE CLASS PRINCIPAL BALANCE OF THE
    CLASS I CERTIFICATES (SUCH EXCESS BEING REFERRED TO AS THE "GROUP I
    SUBORDINATE AMOUNT") AND (II) THE PRODUCT OF (X) 8.000% AND (Y) THE EXCESS,
    IF ANY, OF THE AGGREGATE STATED PRINCIPAL BALANCE OF THE GROUP II LOANS, 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, AND AFTER
    GIVING EFFECT TO ANY PRINCIPAL PREPAYMENTS DISTRIBUTED ON THE PRIOR
    DISTRIBUTION DATE, OVER THE THEN OUTSTANDING AGGREGATE CLASS PRINCIPAL
 
                                      S-2
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
    BALANCE OF THE CLASS II CERTIFICATES (SUCH EXCESS BEING REFERRED TO AS THE
    "GROUP II SUBORDINATE AMOUNT") OVER (B) THE SUM OF THE GROUP I SUBORDINATE
    AMOUNT AND THE GROUP II SUBORDINATE AMOUNT. THE INITIAL REMITTANCE RATE FOR
    EACH CLASS OF THE CLASS B CERTIFICATES WILL BE APPROXIMATELY 7.683% PER
    ANNUM.
 
    The Certificates, other than the Class R-1 and Class R-2 Certificates, will
evidence all the beneficial ownership interest in a trust (the "Certificate
Trust") established by the Company, the assets of which, together with the Class
R-2 Certificates described below, will evidence all the beneficial ownership
interest in another trust (the "First Level Certificate Trust"), which will
evidence, together with the Class R-1 Certificates described below, all the
beneficial ownership interest in another trust (the "Mortgage Trust") also
established by the Company. The Mortgage Trust will consist of a pool of
conventional fixed-rate one- to four-family residential and cooperative
apartment mortgage loans with original terms to maturity of not more than 30
years (the "Mortgage Loans") deposited and master serviced by the Company, and
certain other assets, as described herein. The Mortgage Pool (as described
herein) consists of two groups of Mortgage Loans ("Loan Group I" and "Loan Group
II", and each, a "Loan Group"). The Class I Certificates will correspond to the
Group I Loans and initially will evidence, in the aggregate, a 96.00% undivided
interest in the Group I Loans, which consist of fixed-rate Mortgage Loans with
terms to maturity of not more than 15 years. The Class II Certificates will
correspond to the Group II Loans and initially will evidence a 96.00% undivided
interest in the Group II Loans, which consist of fixed-rate Mortgage Loans with
terms to maturity of not more than 30 years. Distributions of interest and
principal on the Class I Certificates and the Class II Certificates will be
based on interest and principal received or advanced with respect to the Group I
Loans and Group II Loans, respectively, except under the limited circumstances
described herein. The rights of the holders of the Class B Certificates to
receive distributions with respect to the Mortgage Loans will be based upon
interest and principal received or advanced with respect to both Loan Groups,
and will be subordinate to the rights of the holders of the Senior Certificates
to the extent described herein and in the Prospectus.
 
    The Company intends to cause elections to be made to treat the Mortgage
Trust, the First Level Certificate Trust and the Certificate Trust as "real
estate mortgage investment conduits" (each, a "REMIC") for federal income tax
purposes. All of the certificates issued by the Mortgage Trust, the First Level
Certificate Trust and the Certificate Trust, other than the Class R-1, Class R-2
and Class R Certificates, will represent ownership of REMIC "regular interests".
The Class R, Class R-2 and Class R-1 Certificates will represent ownership of
the REMIC "residual interest" in the Certificate Trust, the First Level
Certificate Trust and the Mortgage Trust, respectively. See "Certain Federal
Income Tax Consequences" herein and in the Prospectus.
 
    The Offered Certificates, other than the Class R-1 and Class R-2
Certificates, evidence interests only in the Certificate Trust and are payable
solely from amounts received with respect thereto. The Class R-1 Certificates
evidence the residual interests in only the Mortgage Trust. The Class R-2
Certificates evidence the residual interests in only the First Level Certificate
Trust and the Class R Certificates evidence the residual interests in only the
Certificate Trust.
 
    The Company has the right to effect early retirement of the Certificates
under certain circumstances. See "Description of the Certificates -- Optional
Termination of the Mortgage Trust" herein.
 
    The yield to maturity on the Class A Certificates generally will depend on
the rate and timing of principal payments (including prepayments, defaults and
liquidations) on the Mortgage Loans in the related Loan Group. In certain
limited circumstances, as described herein, principal payments for the Mortgage
Loans in a Loan Group will be distributed to Senior Certificates relating to the
other Loan Group, and therefore, could affect the yield to maturity of such
Senior Certificates.
 
    The yield to maturity on the Floater Certificates will be sensitive to
fluctuations in the level of LIBOR, and the yield to maturity on the Inverse
Floater Certificates will be extremely sensitive to fluctuations in the level of
LIBOR, as defined herein, and to the rate of Principal Prepayments on the Group
II Loans. Prospective investors should fully consider the risks associated with
an investment in
 
                                      S-3
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
the Inverse Floater Certificates, including the possibility that if the rate of
Principal Prepayments on the Group II Loans is rapid or if the level of LIBOR is
high, investors in the Inverse Floater Certificates may not fully recoup their
initial investments. In addition, in the event of very high Principal
Prepayments of Group I Loans and the reduction of the Class IA Principal Balance
to zero, subject to certain limitations set forth herein, all principal (after
giving effect to the distribution to the Class IP Certificates) of the Group I
Loans will be distributed to the Class IIA Certificates, and therefore, may
adversely affect the yield of the Inverse Floater Certificates. See "Yield and
Prepayment Considerations" herein.
 
    The yields to maturity on the Class X and Class P Certificates will be
extremely sensitive to the level of Principal Prepayments on the Mortgage Loans
in the related Loan Group. The interest payable to the Class IX Certificates is
based on the weighted average of the Stripped Interest Rates (as defined herein)
of the Group I Loans having Pass-Through Rates in excess of 7.000% (the "15-Year
Premium Rate Mortgage Loans"). The interest payable to the Class IIX
Certificates is based on the weighted average of the Stripped Interest Rates of
the Group II Loans having Pass-Through Rates in excess of 8.000% (the "30-Year
Premium Rate Mortgage Loans"). Therefore the yield to maturity on the Class X
Certificates will generally decrease as a result of faster than expected
Principal Prepayments on such Premium Rate Mortgage Loans. Prospective investors
should fully consider the risks associated with an investment in the Class X
Certificates, including the possibility that if the rate of Principal
Prepayments on the Mortgage Loans in the related Loan Group is rapid, such
investors may not fully recoup their initial investments. Because the principal
payable with respect to the Class IP Certificates (which are entitled to receive
distributions of principal only) is derived from Group I Loans with Pass-Through
Rates that are lower than 7.000%, the yield to maturity on the Class IP
Certificates will be adversely affected by slower than expected prepayments of
Group I Loans with Pass-Through Rates less than 7.000%. Because the principal
payable with respect to the Class IIP Certificates (which are entitled to
receive distributions of principal only) is derived from Group II Loans with
Pass-Through Rates that are lower than 8.000%, the yield to maturity on the
Class IIP Certificates will be adversely affected by slower than expected
prepayments of Group II Loans with Pass-Through Rates less than 8.000%. Because
the interest payable on the Class IX and Class IIX Certificates and the
principal distributable to the Class IP and Class IIP Certificates are in part
derived from different groups of Mortgage Loans within the related Loan Group,
it is possible that faster than expected prepayments with respect to the Class X
Certificates may occur at the same time as slower than expected prepayments with
respect to the Class P Certificates. See "Yield and Prepayment Considerations"
herein.
 
    The rights of the holders of the Senior Subordinate Certificates to receive
distributions of interest and principal are subordinated to the rights of the
holders of the Senior Certificates to receive distributions of interest and
principal. In addition, the rights of the holders of the Class B-2 Certificates
to receive distributions of interest and principal are subordinated to the
rights of the holders of the Class B-1 Certificates to receive distributions of
interest and principal, and such rights of the holders of the Class B-3
Certificates are similarly subordinated to the rights of the holders of the
Class B-1 and Class B-2 Certificates. Furthermore, following the reduction of
the aggregate Class Principal Balance of the Junior Subordinate Certificates to
zero, the yield to maturity on each Class of the Senior Subordinate Certificates
will be extremely sensitive to certain realized losses on the Mortgage Loans
because a disproportionate amount of such losses (rather than a pro rata portion
thereof) generally will be allocable to such Certificates, in the order Class
B-3, Class B-2 and then Class B-1. Similarly, following the reduction of the
aggregate Class Principal Balance of the Class B Certificates to zero, the yield
to maturity on the Senior Certificates will be extremely sensitive to all
realized losses on the Mortgage Loans in the related Loan Group and certain
realized losses on the Mortgage Loans in the other Loan Group. See "Description
of the Certificates -- Subordination and Allocation of Losses" herein.
 
    Although the Lockout Certificates are Senior Certificates, the Class IIA-5
Certificates will generally not be entitled to receive any principal
distributions until January 2002 (other than the Class IIA-5 Liquidation Amount)
and the Class IA-3 Certificates will not be entitled to receive any Principal
Prepayments until January 2002. Therefore, the Class IA-3 and Class IIA-5
Certificates will not be entitled
 
                                      S-4
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
to receive the disproportionate allocation of Principal Prepayments that the
other Senior Certificates are entitled to receive. See "Description of the
Certificates -- Distributions of Principal" and "Yield and Prepayment
Considerations".
 
    The Offered Certificates, other than the Class X, Class IIA-3, Class IIA-4,
Inverse Floater and Residual Certificates, are offered in minimum denominations
equivalent to not less than $25,000 initial Certificate Principal Balance each
and multiples of $1 in excess thereof. The Class X and Inverse Floater
Certificates are offered in minimum denominations equivalent to not less than
$100,000 initial Class IX, Class IIX or Class IIA-2 Class Notional Amount, as
the case may be, and multiples of $1 in excess thereof, except that one Class
IX, Class IIX and Inverse Floater Certificate may be issued in a different
amount. The Class IIA-3 and Class IIA-4 Certificates are offered in minimum
denominations equivalent to not less than $1,000 initial Certificate Principal
Balance each and multiples of $1 in excess thereof. The Class R, Class R-1 and
Class R-2 Certificates will each be offered in registered, certificated form in
a single denomination of 99.99% Percentage Interest. The remaining 0.01%
Percentage Interest of each of the Class R, Class R-1 and Class R-2 Certificates
will be retained by the Company as set forth herein under "Certain Federal
Income Tax Consequences". There is at present no market for any Class of
Certificates and there can be no assurance that a secondary market for any Class
of Certificates will develop or, if it does develop, that it will provide
Certificateholders of such Class with liquidity of investment or will continue
for the life of such Class of Certificates.
 
    The Offered Certificates offered by this Supplement constitute a separate
Series of Certificates being offered by the Company from time to time pursuant
to the Prospectus dated November 21, 1996 of which this Supplement is a part and
which accompanies this Supplement. The Prospectus contains important information
regarding this offering which is not contained herein, and prospective investors
are urged to read the Prospectus and this Supplement in full.
 
    UNTIL THE EXPIRATION OF 90 DAYS AFTER THE DATE OF THIS SUPPLEMENT, ALL
DEALERS EFFECTING TRANSACTIONS IN THE OFFERED CERTIFICATES, WHETHER OR NOT
PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A SUPPLEMENT AND
THE PROSPECTUS TO WHICH IT RELATES. THIS IS IN ADDITION TO THE OBLIGATION OF
DEALERS TO DELIVER A SUPPLEMENT AND PROSPECTUS WHEN ACTING AS UNDERWRITERS AND
WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
 
    NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS SUPPLEMENT AND THE PROSPECTUS
TO WHICH IT RELATES, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS
MUST NOT BE RELIED UPON. THIS SUPPLEMENT DOES NOT CONSTITUTE AN OFFER TO SELL OR
A SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE OFFERED
CERTIFICATES OFFERED HEREBY NOR AN OFFER OF THE OFFERED CERTIFICATES TO ANY
PERSON IN ANY STATE OR OTHER JURISDICTION IN WHICH SUCH OFFER WOULD BE UNLAWFUL.
THE DELIVERY OF THIS SUPPLEMENT AT ANY TIME DOES NOT IMPLY THAT INFORMATION
HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE; HOWEVER, IF ANY
MATERIAL CHANGE OCCURS WHILE THIS SUPPLEMENT IS REQUIRED BY LAW TO BE DELIVERED,
THIS SUPPLEMENT WILL BE AMENDED OR SUPPLEMENTED ACCORDINGLY.
 
                                      S-5
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                            ---------
<S>                                                                                                         <C>
SUMMARY INFORMATION.......................................................................................        S-7
RISK FACTORS..............................................................................................       S-37
  General.................................................................................................       S-37
  Book-Entry System.......................................................................................       S-39
THE CERTIFICATE TRUST, THE FIRST LEVEL CERTIFICATE TRUST AND THE MORTGAGE TRUST...........................       S-39
DESCRIPTION OF THE MORTGAGE POOL..........................................................................       S-40
  Loan Group I............................................................................................       S-41
  Loan Group II...........................................................................................       S-42
  Additional Information..................................................................................       S-43
DESCRIPTION OF THE CERTIFICATES...........................................................................       S-44
  General.................................................................................................       S-44
  Book-Entry Registration.................................................................................       S-45
  Definitive Certificates.................................................................................       S-46
  Priority of Distributions...............................................................................       S-47
  Distributions of Interest...............................................................................       S-50
  LIBOR...................................................................................................       S-52
  Distributions of Principal..............................................................................       S-53
  Subordination and Allocation of Losses..................................................................       S-60
  The Class R-1, Class R-2 and Class R Certificates.......................................................       S-62
  Advances................................................................................................       S-62
  Available Distribution Amount...........................................................................       S-62
  Last Scheduled Distribution Date........................................................................       S-64
  Optional Termination of the Mortgage Trust..............................................................       S-64
  Servicing Compensation and Payment of Expenses..........................................................       S-64
YIELD AND PREPAYMENT CONSIDERATIONS.......................................................................       S-65
  General.................................................................................................       S-65
  Yield Considerations with Respect to the Class X, Inverse Floater and Class P Certificates..............       S-68
  Yield Considerations with Respect to the Senior Subordinate Certificates................................       S-71
  Additional Yield Considerations Applicable Solely to the Residual Certificates..........................       S-74
  Additional Information..................................................................................       S-74
CREDIT ENHANCEMENTS.......................................................................................       S-74
  Subordination...........................................................................................       S-74
  Shifting of Interests...................................................................................       S-75
CERTAIN FEDERAL INCOME TAX CONSEQUENCES...................................................................       S-75
  Special Tax Considerations Applicable to the Residual Certificates......................................       S-77
CERTAIN LEGAL INVESTMENT ASPECTS..........................................................................       S-78
ERISA CONSIDERATIONS......................................................................................       S-79
  Underwriter's PTE.......................................................................................       S-79
  Prohibited Transaction Class Exemptions.................................................................       S-80
  Restrictions on Senior Subordinate and Residual Certificates............................................       S-81
METHOD OF DISTRIBUTION....................................................................................       S-81
LEGAL MATTERS.............................................................................................       S-81
CERTIFICATE RATINGS.......................................................................................       S-81
Appendix A................................................................................................       S-83
</TABLE>
 
                                      S-6
<PAGE>
                              SUMMARY INFORMATION
 
    THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE
DETAILED INFORMATION APPEARING ELSEWHERE HEREIN AND IN THE PROSPECTUS.
CAPITALIZED TERMS USED HEREIN AND NOT OTHERWISE DEFINED HEREIN HAVE THE MEANINGS
ASSIGNED IN THE PROSPECTUS.
 
<TABLE>
<S>                               <C>
Certificates....................  Mortgage Pass-Through Certificates, Series 1996-4 (the
                                  "Certificates"), consisting of the following twenty-three
                                  classes: (i) Class IA-1, Class IA-2 and Class IA-3 (the
                                  "Class IA Certificates"), (ii) Class IIA-1, Class IIA-2,
                                  Class IIA-3, Class IIA-4, Class IIA-5, Class IIA-6 and
                                  Class IIA-7 (the "Class IIA Certificates" and together
                                  with the Class IA Certificates, the "Class A
                                  Certificates"), (iii) Class IP and Class IIP (the "Class P
                                  Certificates"), (iv) Class IX and Class IIX (the "Class X
                                  Certificates"), (v) Class B-1, Class B-2 and Class B-3
                                  (the "Senior Subordinate Certificates"), (vi) Class B-4,
                                  Class B-5 and Class B-6 (the "Junior Subordinate
                                  Certificates" and together with the Senior Subordinate
                                  Certificates, the "Subordinate Certificates" or the "Class
                                  B Certificates") and (vii) Class R, Class R-1 and Class
                                  R-2 (the "Residual Certificates" and together with the
                                  Class A, Class X and Class P Certificates, the "Senior
                                  Certificates"). The Class IA, Class IP and Class IX
                                  Certificates are sometimes referred to as the "Class I
                                  Certificates" and the Class IIA, Class IIP and Class IIX
                                  Certificates are sometimes referred to as the "Class II
                                  Certificates". The Class IA-3 and Class IIA-5 Cer-
                                  tificates are sometimes referred to as the "Lockout
                                  Certificates". The Class IIA-1 and Class IIA-2
                                  Certificates are sometimes referred to as the "LIBOR
                                  Certificates". The Class IIA-1 Certificates are sometimes
                                  referred to as the "Floater Certificates" and the Class
                                  IIA-2 Certificates are sometimes referred to as the
                                  "Inverse Floater Certificates". Only the Senior Certifi-
                                  cates and the Senior Subordinate Certificates (the
                                  "Offered Certificates") are offered hereby. The Junior
                                  Subordinate Certificates are not offered hereby.
</TABLE>
 
                                      S-7
<PAGE>
<TABLE>
<S>                               <C>
                                  The approximate initial Class Principal Balances and
                                  Remittance Rates of the Offered Certificates will be as
                                  follows:
 
<CAPTION>
 
CLASS                                    APPROXIMATE INITIAL CLASS PRINCIPAL BALANCE
- --------------------------------                       ----------------
                                                   REMITTANCE
                                                                 RATE(1)
                                                   --
<S>                               <C>
Class IA-1.......................  $   31,969,544          7.000%
Class IA-2.......................       7,680,000          7.000%
Class IA-3.......................       4,700,000          7.000%
Class IIA-1......................      25,494,373        Floating Rate(2)
Class IIA-2......................        --        Floating Rate(3)
Class IIA-3......................      11,164,000            7.750       %
Class IIA-4......................       3,436,000            8.000       %
Class IIA-5......................       9,658,126            8.000       %
Class IIA-6......................      22,703,372            7.250       %
Class IIA-7......................      22,703,372            7.750       %
Class IX.........................        --                  7.000       %(4)
Class IIX........................        --                  8.000       %(5)
Class IP.........................         336,248              (6)
Class IIP........................         993,737              (7)
Class B-1........................       1,833,840        Variable Rate(8)
Class B-2........................       1,833,840        Variable Rate(8)
Class B-3........................         733,536        Variable Rate(8)
Class R..........................              50            7.000       %
Class R-1........................              50            7.000       %
Class R-2........................              50            7.000       %
</TABLE>
 
<TABLE>
<S>                               <C>
                                  ------------------------
                                  (1)  Interest distributed to the Offered Certificates on
                                  each Distribution Date will have accrued during the
                                       preceding calendar month at the applicable per annum
                                       Remittance Rate, except for (i) the LIBOR
                                       Certificates which will accrue interest during the
                                       period from the 25th of the month prior to each
                                       Distribution Date to the 24th of the month of such
                                       Distribution Date and (ii) the Class P Certificates
                                       which will not be entitled to receive interest.
 
                                  (2)  The initial Remittance Rate for the Class IIA-1
                                  Certificates will be 6.125% per annum. Thereafter, the
                                       Class IIA-1 Certificates will accrue interest at a
                                       per annum rate equal to LIBOR (as defined herein)
                                       plus 0.750%, subject to a minimum and maximum
                                       Remittance Rate of 0.750% and 9.000% per annum,
                                       respectively.
 
                                  (3)  The initial Remittance Rate for the Class IIA-2
                                  Certificates will be 2.875% per annum. Thereafter, the
                                       Class IIA-2 Certificates will accrue interest at a
                                       per annum rate equal to 8.250% minus LIBOR, subject
                                       to a minimum and maximum Remittance Rate of 0.000%
                                       and 8.250% per annum, respectively. The Class IIA-2
                                       Certificates will not be entitled to receive
                                       distributions of principal and will accrue interest
                                       on the Class IIA-2 Notional Amount which will equal
                                       the Class IIA-1 Principal Balance at the time of
                                       determination.
 
                                  (4)  The Remittance Rate on the Class IX Certificates will
                                  be 7.000% per annum. The Class IX Certificates will accrue
                                       interest on the Class IX Notional Amount. The "Class
                                       IX Notional Amount" with respect to any Distribution
                                       Date will equal the product of (x) the aggregate
                                       Stated Principal Balance (as defined herein), 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 Loans (as defined herein) having
                                       Pass-Through Rates in excess of 7.000% per annum (the
                                       "15-Year Premium Rate Mortgage
</TABLE>
 
                                      S-8
<PAGE>
 
<TABLE>
<S>                               <C>
                                       Loans") and (y) a fraction, the numerator of which is
                                       the weighted average of the Stripped Interest Rates
                                       (as defined herein) for the 15-Year Premium Rate
                                       Mortgage Loans as of such Due Date and the
                                       denominator of which is 7.000%. The Class IX Notional
                                       Amount as of the Cut-Off Date will be approximately
                                       $2,589,942.
 
                                  (5)  The Remittance Rate on the Class IIX Certificates
                                  will be 8.000% per annum. The Class IIX Certificates will
                                       accrue interest on the Class IIX Notional Amount. The
                                       "Class IIX Notional Amount" with respect to any
                                       Distribution Date will equal the product of (x) the
                                       aggregate Stated 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 Loans (as defined herein) having
                                       Pass-Through Rates in excess of 8.000% per annum (the
                                       "30-Year Premium Rate Mortgage Loans") and (y) a
                                       fraction, the numerator of which is the weighted
                                       average of the Stripped Interest Rates (as defined
                                       herein) for the 30-Year Premium Rate Mortgage Loans
                                       as of such Due Date and the denominator of which is
                                       8.000%. The Class IIX Notional Amount as of the
                                       Cut-Off Date will be approximately $3,122,756.
 
                                  (6)  The Class IP Certificates will not be entitled to
                                  receive distributions of interest.
 
                                  (7)  The Class IIP Certificates will not be entitled to
                                  receive distributions of interest.
 
                                  (8)  The Remittance Rate on the Class B-1, Class B-2 and
                                  Class B-3 Certificates will equal, on any Distribution
                                       Date, the quotient expressed as a percentage of (a)
                                       the sum of (i) the product of (x) 7.000% and (y) the
                                       excess, if any, of the aggregate Stated Principal
                                       Balance of the Group I Loans, 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, and after giving effect to any
                                       Principal Prepayments distributed on the prior
                                       Distribution Date, over the then outstanding
                                       aggregate Class Principal Balance of the Class I
                                       Certificates (such excess being referred to as the
                                       "Group I Subordinate Amount") and (ii) the product of
                                       (x) 8.000% and (y) the excess, if any, of the
                                       aggregate Stated Principal Balance of the Group II
                                       Loans, 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, and after
                                       giving effect to any Principal Prepayments
                                       distributed on the prior Distribution Date, over the
                                       then outstanding aggregate Class Principal Balance of
                                       the Class II Certificates (such excess being referred
                                       to as the "Group II Subordinate Amount") over (b) the
                                       sum of the Group I Subordinate Amount and the Group
                                       II Subordinate Amount. The initial Remittance Rate
                                       for each Class of the Class B Certificates will be
                                       approximately 7.683% per annum.
 
                                  The Certificates, other than the Class R-1 and Class R-2
                                  Certificates, will evidence all the beneficial ownership
                                  in a trust (the "Certificate Trust") established by the
                                  Company, the assets of which, together with the Class R-2
                                  Certificates described below, will evidence all the
                                  beneficial ownership interest in another trust (the "First
                                  Level Certificate Trust"), which will evidence, together
                                  with the Class R-1 Certificates described below, all the
                                  beneficial ownership interest in another trust (the
                                  "Mortgage Trust"), also established by the Company, into
                                  which the mortgage loans (the "Mortgage Loans") will be
                                  deposited. The Company will cause elections to be made to
                                  treat the Mortgage Trust, the First Level Certificate
                                  Trust and the Certificate Trust as real estate mortgage
                                  investment conduits (each, a "REMIC"). See "Description of
                                  the Certificates" herein.
</TABLE>
 
                                      S-9
<PAGE>
 
<TABLE>
<S>                               <C>
The Mortgage Pool...............  The Mortgage Pool consists of two groups of Mortgage Loans
                                  ("Loan Group I" and "Loan Group II", and each, a "Loan
                                  Group").
 
                                  GROUP I LOANS.  The Group I Loans consist of approximately
                                  129 Mortgage Loans with an aggregate principal balance as
                                  of the Cut-Off Date of approximately $46,547,857. The
                                  Group I Loans had individual principal balances at
                                  origination of at least approximately $220,000 but not
                                  more than approximately $1,340,625, with an average
                                  principal balance at origination of approximately
                                  $372,856. The Group I Loans have terms to maturity from
                                  the date of origination of not more than 15 years, with a
                                  weighted average remaining term to maturity of approxi-
                                  mately 172.2 months as of the Cut-Off Date.
 
                                  GROUP II LOANS.  The Group II Loans consist of
                                  approximately 316 Mortgage Loans with an aggregate
                                  principal balance as of the Cut-off Date of approximately
                                  $100,159,355. The Group II Loans had individual principal
                                  balances at origination of at least approximately $215,000
                                  but not more than approximately $918,750, with an average
                                  principal balance at origination of approximately
                                  $317,316. The Group II Loans have terms to maturity from
                                  the date of origination of not more than 30 years, with a
                                  weighted average remaining term to maturity of approxi-
                                  mately 358.2 months as of the Cut-Off Date.
 
                                  For a further description of the Mortgage Loans, see
                                  "Description of the Mortgage Pool" herein.
 
Initial Aggregate Certificate
 Principal Balance of the
 Offered Certificates...........  $145,240,138 (approximate, subject to an upward or
                                  downward variance of no more than approximately 5%). The
                                  Senior Certificates will comprise approximately 96.00%,
                                  the Senior Subordinate Certificates will comprise
                                  approximately 3.00%, and the Junior Subordinate
                                  Certificates will comprise approximately 1.00% of the
                                  initial aggregate Certificate Principal Balance of the
                                  Certificates.
 
Mortgage Pool Initial Weighted
 Average Mortgage Interest
 Rate...........................  8.189% (approximate).
 
Loan Group I Initial Weighted
 Average Mortgage Interest
 Rate...........................  7.609% (approximate).
 
Loan Group II Initial Weighted
 Average Mortgage Interest
 Rate...........................  8.458% (approximate).
 
The Certificate Trust, the First
 Level Certificate Trust and the
 Mortgage Trust.................  The assets of the Certificate Trust will consist of the
                                  certificates (other than the Class R-2 Certificates)
                                  issued by the First Level Certificate Trust. The assets of
                                  the First Level Certificate Trust will consist of the
                                  certificates (other than the Class R-1 Certificates)
                                  issued by the Mortgage Trust. The assets of the Mortgage
                                  Trust will consist of a pool (the "Mortgage Pool") of
                                  conventional fixed-rate one- to four-family residential
                                  and cooperative
</TABLE>
 
                                      S-10
<PAGE>
 
<TABLE>
<S>                               <C>
                                  apartment Mortgage Loans with original terms to maturity
                                  of generally not more than 30 years, with an aggregate
                                  outstanding principal balance as of the Cut-Off Date of
                                  approximately $146,707,211. The Mortgage Trust will also
                                  contain (i) certain insurance policies related to the
                                  Mortgage Loans, (ii) any property which secured a Mortgage
                                  Loan and which is acquired by foreclosure or by deed in
                                  lieu of foreclosure after the Cut-Off Date, (iii) amounts
                                  held in the Certificate Account, and (iv) certain other
                                  assets. See "The Certificate Trust, the First Level
                                  Certificate Trust and the Mortgage Trust" herein.
 
Depositor and Master Servicer...  PNC Mortgage Securities Corp.
 
Trustee.........................  First Bank National Association.
 
Cut-Off Date....................  December 1, 1996.
 
Closing Date....................  On or about December 27, 1996.
 
Book-Entry Registration.........  Except in certain limited circumstances as described
                                  herein, the Class A Certificates generally will be
                                  available only in book-entry form through the facilities
                                  of The Depository Trust Company ("DTC"). See "Description
                                  of the Certificates -- Book-Entry Registration" herein.
 
Priority of Distributions.......  On the 25th day of each month, or if such 25th day is not
                                  a business day, on the immediately succeeding business day
                                  (each, a "Distribution Date"), prior to the Credit Support
                                  Depletion Date (as defined herein), distributions will be
                                  made in the order and priority as follows:
 
                                  (a)  with respect to the Class I Certificates and the
                                  Residual Certificates, to the extent of the Available
                                       Distribution Amount (as defined herein) for Loan
                                       Group I remaining following prior distributions, if
                                       any, on such Distribution Date:
 
                                  (i)  first, to the Class IP Certificates, the Class IP
                                  Fraction (as defined herein) of all principal received on
                                       or in respect of each Class IP Mortgage Loan (as
                                       defined herein);
 
                                  (ii)  second, to the Class I Certificates (other than the
                                        Class IP Certificates) and the Residual
                                        Certificates, accrued and unpaid interest at the
                                        respective Remittance Rates on their respective
                                        Class Principal Balances (or the Class IX Notional
                                        Amount, in the case of the Class IX Certificates);
 
                                  (iii)  third, to the Class IA Certificates and the
                                  Residual Certificates, as principal, the Class IA
                                         Principal Distribution Amount in the order
                                         described in "Description of the Certificates --
                                         Distributions of Principal -- CLASS IA PRINCIPAL
                                         DISTRIBUTION AMOUNT" herein; and
 
                                  (iv)  fourth, for so long as the Class B Certificates are
                                  outstanding, to the Class IP Certificates, the sum of
</TABLE>
 
                                      S-11
<PAGE>
 
<TABLE>
<S>                               <C>
                                        (a) principal in an amount equal to the Class IP
                                        Fraction of certain principal losses on the Class IP
                                        Mortgage Loans, as described in "Description of the
                                        Certificates -- Distributions of Principal" herein
                                        to the extent of amounts otherwise available to pay
                                        the Subordinate Principal Distribution Amount (as
                                        defined herein) (without regard to clause (B) of
                                        such definition) on such Distribution Date and (b)
                                        the sum of amounts, if any, by which the amount
                                        described in clause (a) above on each prior
                                        Distribution Date exceeded the amount actually
                                        distributed in respect thereof on such prior
                                        Distribution Dates and not subsequently distributed,
                                        to the extent of the Subordinate Principal
                                        Distribution Amount on such Distribution Date (any
                                        amounts distributed in respect of losses pursuant to
                                        this paragraph shall not cause a further reduction
                                        in the Class Principal Balance of the Class IP
                                        Certificates); PROVIDED, that if the amounts
                                        otherwise available to pay the Subordinate Principal
                                        Distribution Amount for any such Distribution Date
                                        are insufficient to cover such outstanding principal
                                        losses for the Class IP Certificates as provided
                                        above and Class IIP Certificates as provided in
                                        clause (iv) of paragraph (b) below, then the amounts
                                        otherwise available to pay the Subordinate Principal
                                        Distribution Amount will be allocated pro rata to
                                        the Class IP and Class IIP Certificates based on the
                                        amount such Certificates are entitled to receive
                                        pursuant to this clause, in the case of the Class IP
                                        Certificates, and clause (iv) of paragraph (b)
                                        below, in the case of the Class IIP Certificates;
 
                                  (b)  with respect to the Class II Certificates, to the
                                  extent of the Available Distribution Amount for Loan Group
                                       II remaining following prior distributions, if any,
                                       on such Distribution Date:
 
                                  (i)  first, to the Class IIP Certificates, the Class IIP
                                  Fraction (as defined herein) of all principal received on
                                       or in respect of each Class IIP Mortgage Loan (as
                                       defined herein);
 
                                  (ii)  second, to the Class II Certificates (other than the
                                        Class IIP Certificates), accrued and unpaid interest
                                        at their respective Remittance Rates on their
                                        respective Class Principal Balances (or the Class
                                        IIX and Class IIA-2 Notional Amounts, in the case of
                                        the Class IIX and Class IIA-2 Certificates,
                                        respectively);
 
                                  (iii)  third, to the Class IIA Certificates, as principal,
                                  the Class IIA Principal Distribution Amount in the order
                                         described in "Description of the Certificates --
                                         Distributions of Principal -- CLASS IIA PRINCIPAL
                                         DISTRIBUTION AMOUNT" herein; and
</TABLE>
 
                                      S-12
<PAGE>
 
<TABLE>
<S>                               <C>
                                  (iv)  fourth, for so long as the Class B Certificates are
                                  outstanding, to the Class IIP Certificates, the sum of (a)
                                        principal in an amount equal to the Class IIP Frac-
                                        tion of certain principal losses on the Class IIP
                                        Mortgage Loans, as described in "Description of the
                                        Certificates -- Distributions of Principal" herein
                                        to the extent of amounts otherwise available to pay
                                        the Subordinate Principal Distribution Amount
                                        (without regard to clause (B) of such definition) on
                                        such Distribution Date and (b) the sum of amounts,
                                        if any, by which the amount described in clause (a)
                                        above on each prior Distribution Date exceeded the
                                        amount actually distributed in respect thereof on
                                        such prior Distribution Dates and not subsequently
                                        distributed, to the extent of the Subordinate
                                        Principal Distribution Amount on such Distribution
                                        Date (any amounts distributed in respect of losses
                                        pursuant to this paragraph shall not cause a further
                                        reduction in the Class Principal Balance of the
                                        Class IIP Certificates); PROVIDED, that if the
                                        amounts otherwise available to pay the Subordinate
                                        Principal Distribution Amount for any such
                                        Distribution Date are insufficient to cover such
                                        outstanding principal losses for the Class IIP
                                        Certificates as provided above and Class IP Certifi-
                                        cates as provided in clause (iv) of paragraph (a)
                                        above, then the amounts otherwise available to pay
                                        the Subordinate Principal Distribution Amount will
                                        be allocated pro rata to the Class IP and Class IIP
                                        Certificates based on the amount such Certificates
                                        are entitled to receive pursuant to this clause, in
                                        the case of the Class IIP Certificates, and clause
                                        (iv) of paragraph (a) above, in the case of the
                                        Class IP Certificates;
 
                                  (c)  With respect to the Class B Certificates and the
                                  Residual Certificates, subject to the payment of the
                                       Senior Certificates as described above, and to the
                                       extent of the Available Distribution Amount for both
                                       Loan Groups remaining, if any, following prior
                                       distributions on such Distribution Date:
 
                                  (i)  first, to the Class B-1 Certificates, accrued and un-
                                       paid interest at the Class B-1 Remittance Rate on the
                                       Class B-1 Principal Balance;
 
                                  (ii)  second, to the Class B-1 Certificates, their pro
                                  rata share of the Subordinate Principal Distribution
                                        Amount;
 
                                  (iii)  third, to the Class B-2 Certificates, accrued and
                                  unpaid interest at the Class B-2 Remittance Rate on the
                                         Class B-2 Principal Balance;
 
                                  (iv)  fourth, to the Class B-2 Certificates, their pro
                                  rata share of the Subordinate Principal Distribution
                                        Amount;
</TABLE>
 
                                      S-13
<PAGE>
 
<TABLE>
<S>                               <C>
                                  (v)  fifth, to the Class B-3 Certificates, accrued and un-
                                       paid interest at the Class B-3 Remittance Rate on the
                                       Class B-3 Principal Balance;
 
                                  (vi)  sixth, to the Class B-3 Certificates, their pro rata
                                        share of the Subordinate Principal Distribution
                                        Amount;
 
                                  (vii)  seventh, to the Junior Subordinate Certificates,
                                  interest and principal in the same manner as for the
                                         Senior Subordinate Certificates, first to the Class
                                         B-4 Certificates, then to the Class B-5 Certifi-
                                         cates and then to the Class B-6 Certificates;
 
                                  (viii)  eighth, to each Class of the Subordinate
                                  Certificates in the order of seniority, the remaining
                                          portion, if any, of the Available Distribution
                                          Amount, up to the amount of unreimbursed realized
                                          losses previously allocated to such Class, if any,
                                          (provided distribution of any amount pursuant to
                                          this paragraph shall not cause a further reduction
                                          in the Class Principal Balances of the Subordinate
                                          Certificates); and
 
                                  (ix)  ninth, to the Residual Certificates, the remaining
                                        portion, if any, of the Available Distribution
                                        Amount for such Distribution Date as their
                                        respective interests are described in the Pooling
                                        Agreement.
 
                                  With respect to the Class B Certificates, notwithstanding
                                  the foregoing, on any Distribution Date on which the
                                  Subordination Level for any Class of Class B Certificates
                                  is less than such percentage as of the Cut-Off Date, the
                                  portion of the Subordinate Principal Distribution Amount
                                  otherwise allocable to the Class or Classes junior to such
                                  Class will be allocated to the most senior Class of Class
                                  B Certificates for which the Subordination Level is less
                                  than such percentage as of the Cut-Off Date and to the
                                  Class or Classes of Class B Certificates senior thereto,
                                  pro rata according to the Class Principal Balances of such
                                  Classes. The "Subordination Level" on any specified date
                                  with respect to any Class of Class B Certificates is the
                                  percentage obtained by dividing the sum of the Class
                                  Principal Balances of all Classes of Certificates which
                                  are subordinate in right of payment to such Class by the
                                  sum of the Class Principal Balances of all of the
                                  Certificates as of such date prior to giving effect to
                                  distributions or allocations of realized losses on the
                                  Mortgage Loans on such date.
 
                                  CROSS-COLLATERALIZATION.  In certain limited circumstances
                                  prior to the Credit Support Depletion Date but after the
                                  Class IA Principal Balance or Class IIA Principal Balance
                                  has been reduced to zero, all principal on the Mortgage
                                  Loans in the Loan Group relating to the Class A
                                  Certificates that have been paid in full will be paid,
                                  after distributions of principal to the related Class P
                                  Certificates, to the remaining Class A Certificates in
                                  accordance with the order set forth under the applicable
                                  Class A
</TABLE>
 
                                      S-14
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Principal Distribution Amount beginning with clause (ii)
                                  thereof, as described in "Description of the Certificates
                                  -- Distributions of Principal" herein. Consequently, the
                                  Class B Certificates will not receive such amount. In
                                  addition, if on any Distribution Date the aggregate
                                  Certificate Principal Balance of the Class IA Certificates
                                  or Class IIA Certificates is greater than the aggregate
                                  Stated Principal Balance of the Mortgage Loans in the
                                  related Loan Group less the Class P Fraction of any Class
                                  P Mortgage Loans in such Loan Group (the
                                  "Undercollateralized Group"), (i) the portion of the
                                  Available Distribution Amount in respect of principal on
                                  the Mortgage Loans in the other Loan Group (the
                                  "Overcollateralized Group") (after distributions of
                                  principal to the Class P Certificates and Class A
                                  Certificates of the Overcollateralized Group) will be
                                  distributed to the Class A
                                  Certificates of the Undercollateralized Group in
                                  accordance with the order set forth under the applicable
                                  Class A Principal Distribution Amount beginning with
                                  clause (ii) thereof, as described in "Description of the
                                  Certificates -- Distributions of Principal" herein, until
                                  the aggregate Certificate Principal Balance of the Class A
                                  Certificates of the Undercollateralized Group equals the
                                  aggregate Stated Principal Balance of the Mortgage Loans
                                  in the related Loan Group less the Class P Fraction of any
                                  Class P Mortgage Loans in such Loan Group and (ii) the
                                  Available Distribution Amount of the Overcollateralized
                                  Group will be further reduced (after distributions to the
                                  Overcollateralized Group pursuant to subclauses (a)(i) and
                                  (ii) or (b)(i) and (ii), as applicable, under "Description
                                  of the Certificates -- Priority of Distributions" herein)
                                  in an amount equal to one month's interest on the amount
                                  by which the Undercollateralized Group is
                                  undercollateralized at 7.000% per annum if the
                                  Undercollateralized Group is Loan Group I or 8.000% per
                                  annum if the Undercollateralized Group is Loan Group II,
                                  plus any shortfall of interest on the Class A Certificates
                                  of the Undercollaterized Group from prior Distribution
                                  Dates, including accrued and unpaid interest on such
                                  shortfall at the rate described above (any amount covering
                                  interest shortfalls and interest accrued thereon, will be
                                  distributed to the applicable Class or Classes of
                                  Certificates in the priority of interest payable on such
                                  Class of Certificates on such Distribution Date) and such
                                  amount will be added to the Available Distribution Amount
                                  of the Undercollateralized Group. In the event the Class
                                  II Certificates are the Undercollateralized Group, the
                                  reduction in the Available Distribution Amount of the
                                  Overcollateralized Group to pay interest to the
                                  Undercollateralized Group as described above may cause a
                                  shortfall in the amount of principal and interest other-
                                  wise distributable to the Class B Certificates, and
                                  further to the amount of principal otherwise distributable
                                  to the Class IA Certificates because the Class I
                                  Certificates have Remittance Rates less than the Class II
                                  Certificates. Such shortfall shall be payable from amounts
                                  otherwise distributable first from the Subordinate
                                  Certificates in reverse order of their priority of payment
                                  and then from the Class IA Certificates in respect of
                                  principal.
</TABLE>
 
                                      S-15
<PAGE>
 
<TABLE>
<S>                               <C>
                                  On each Distribution Date on or after the Credit Support
                                  Depletion Date, distributions will be made in the order
                                  and priority as follows:
 
                                  (a)  With respect to the Class I Certificates and the
                                  Residual Certificates, subject, in each case, to the
                                       extent of the Available Distribution Amount of Loan
                                       Group I remaining following prior distributions, if
                                       any, on such Distribution Date:
 
                                  (i)  first, to the Class IP Certificates, the Class IP
                                  Fraction of all principal received on or in respect of
                                       each Class IP Mortgage Loan;
 
                                  (ii)  second, to the Class I Certificates (other than the
                                        Class IP Certificates) and the Residual
                                        Certificates, accrued and unpaid interest at their
                                        respective Remittance Rates on their respective
                                        Class Principal Balances (or the Class IX Notional
                                        Amount, in the case of the Class IX Certificates);
 
                                  (iii)  third, to the Class IA Certificates and the
                                  Residual Certificates, the Class IA Principal Distribution
                                         Amount, pro rata according to their respective
                                         Class Principal Balances; and
 
                                  (iv)  fourth, to the Residual Certificates, the remaining
                                        portion, if any, of the Available Distribution
                                        Amount for Loan Group I for such Distribution Date,
                                        as their respective interests are described in the
                                        Pooling Agreement;
 
                                  (b)  with respect to the Class II Certificates and the
                                  Residual Certificates, subject, in each case, to the
                                       extent of the Available Distribution Amount of Loan
                                       Group II remaining following prior distributions, if
                                       any, on such Distribution Date:
 
                                  (i)  first, to the Class IIP Certificates, the Class IIP
                                  Fraction of all principal received on or in respect of
                                       each Class IIP Mortgage Loan;
 
                                  (ii)  second, to the Class II Certificates (other than the
                                        Class IIP Certificates), accrued and unpaid interest
                                        at their respective Remittance Rates on their
                                        respective Class Principal Balances (or the Class
                                        IIX and Class IIA-2 Notional Amount, in the case of
                                        the Class IIX and Class IIA-2 Certificates,
                                        respectively);
 
                                  (iii)  third, to the Class IIA Certificates (other than
                                  the Class IIA-2 Certificates), the Class IIA Principal
                                         Distribution Amount, pro rata according to their
                                         respective Class Principal Balances; and
 
                                  (iv)  fourth, to the Residual Certificates, the remaining
                                        portion, if any, of the Available Distribution
                                        Amount
</TABLE>
 
                                      S-16
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                                        for such Loan Group II for such Distribution Date as
                                        their respective interests are described in the
                                        Pooling Agreement.
 
                                  The "Credit Support Depletion Date" is the first
                                  Distribution Date on which the aggregate of the Class
                                  Principal Balances of the Class B Certificates has been or
                                  will be reduced to zero.
 
                                  Except for the limited circumstances described herein,
                                  distributions of interest and principal to the Class I
                                  Certificates and the Class II Certificates will be based
                                  solely on payments received with respect to Group I Loans
                                  and Group II Loans, respectively.
 
Interest........................  With respect to each Class of Certificates (except the
                                  Class P Certificates, which are not entitled to interest),
                                  interest will be passed through monthly on each
                                  Distribution Date, commencing in January 1997. With
                                  respect to each Distribution Date, an amount of interest
                                  will accrue on each Class of Certificates (other than the
                                  Class P Certificates) generally equal to 1/12th of the
                                  applicable Remittance Rate for such Class multiplied by
                                  the related Class Principal Balance or Class Notional
                                  Amount, as applicable. Interest will not accrue on the
                                  Class P Certificates. Interest to be distributed on the
                                  Certificates on any Distribution Date will consist of
                                  accrued and unpaid interest as of previous Distribution
                                  Dates and interest accrued during the preceding calendar
                                  month, except for the LIBOR Certificates which accrue
                                  interest as described below. All distributions of interest
                                  for each Class of Certificates will generally be made only
                                  to the extent of the Available Distribution Amount for the
                                  related Loan Group as described herein under "Description
                                  of the Certificates -- Priority of Distributions".
 
                                  The Remittance Rates for the Class A (other than the LIBOR
                                  Certificates), Class X and Residual Certificates are fixed
                                  as set forth on the cover page hereof. The Class X
                                  Certificates will accrue interest on the applicable Class
                                  X Notional Amount. The "Class IX Notional Amount" with
                                  respect to any Distribution Date will equal the product of
                                  (x) the aggregate Stated 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 Group I Loans having
                                  Pass-Through Rates in excess of 7.000% per annum (the
                                  "15-Year Premium Rate Mortgage Loans") and (y) a fraction,
                                  the numerator of which is the weighted average of the
                                  Stripped Interest Rates (as defined herein) for the
                                  15-Year Premium Rate Mortgage Loans and the denominator of
                                  which is 7.000%. The Class IX Notional Amount as of the
                                  Cut-Off Date will be approximately $2,589,942. The
                                  "Stripped Interest Rate" for each Mortgage Loan in Loan
                                  Group I is the excess, if any, of the Pass-Through Rate
                                  for such Mortgage Loan over 7.000%.
</TABLE>
 
                                      S-17
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                                  The "Pass-Through Rate" for each Mortgage Loan is equal to
                                  the Mortgage Interest Rate thereon less the sum of the
                                  related Master Servicing Fee and Servicing Fee (each, as
                                  defined herein).
 
                                  The "Class IIX Notional Amount" with respect to any
                                  Distribution Date will equal the product of (x) the
                                  aggregate Stated 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 Group II Loans having
                                  Pass-Through Rates in excess of 8.000% per annum (the
                                  "30-Year Premium Rate Mortgage Loans") and (y) a fraction,
                                  the numerator of which is the weighted average of the
                                  Stripped Interest Rates (as defined herein) for the
                                  30-Year Premium Rate Mortgage Loans and the denominator of
                                  which is 8.000%. The Class IIX Notional Amount as of the
                                  Cut-Off Date will be approximately $3,122,756. The
                                  "Stripped Interest Rate" for each Mortgage Loan in Loan
                                  Group II is the excess, if any, of the Pass-Through Rate
                                  for such Mortgage Loan over 8.000%.
 
                                  The Remittance Rates for the LIBOR Certificates are
                                  adjustable monthly based on changes in LIBOR, as described
                                  herein. Interest to be distributed to the LIBOR
                                  Certificates on any Distribution Date will consist of
                                  interest accrued during the period commencing on the 25th
                                  day of the preceding calendar month and ending on the 24th
                                  day of the month of such Distribution Date. The initial,
                                  minimum and maximum Remittance Rates for the LIBOR
                                  Certificates, as well as the applicable formula for calcu-
                                  lating the Remittance Rates for the LIBOR Certificates,
                                  are specified on pages S-2, S-8, S-52 and S-53 hereof. The
                                  Class IIA-2 Certificates will accrue interest on the Class
                                  IIA-2 Notional Amount, which will equal the Class IIA-1
                                  Principal Balance at the time of determination.
 
                                  The Remittance Rate on the Class B-1, Class B-2 and Class
                                  B-3 Certificates will equal, on any Distribution Date, the
                                  quotient expressed as a percentage of (a) the sum of (i)
                                  the product of (x) 7.000% and (y) the excess, if any, of
                                  the aggregate Stated Principal Balance of the Group I
                                  Loans, 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, and after giving effect to
                                  any Principal Prepayments distributed on the prior
                                  Distribution Date, over the then outstanding aggregate
                                  Class Principal Balance of the Class I Certificates (such
                                  excess being referred to as the "Group I Subordinate
                                  Amount") and (ii) the product of (x) 8.000% and (y) the
                                  excess, if any, of the aggregate Stated Principal Balance
                                  of the Group II Loans, 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 and after
                                  giving effect to any Principal Prepayments distributed on
                                  the prior Distribution Date, over the then outstanding
                                  aggregate Class Principal Balance of the Class II Cer-
                                  tificates (such excess being referred to as the "Group II
</TABLE>
 
                                      S-18
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<S>                               <C>
                                  Subordinate Amount") over (b) the sum of the Group I
                                  Subordinate Amount and the Group II Subordinate Amount.
                                  The initial Remittance Rate for each Class of the Class B
                                  Certificates will be approximately 7.683% per annum.
 
LIBOR...........................  The Remittance Rates for the LIBOR Certificates will be
                                  determined by the Master Servicer based on the average of
                                  quotations of the London Interbank Offered Rate for
                                  one-month U.S. dollar deposits ("LIBOR") as provided by
                                  the Reference Banks (as defined herein), as further
                                  described herein.
 
                                  See "Description of the Certificates -- Distributions of
                                  Interest" herein.
 
Compensating Interest...........  Subject to the limitations described in this Prospectus
                                  Supplement under "Yield and Prepayment Considerations",
                                  the Master Servicer is obligated to pass through on each
                                  Distribution Date an amount equal to the lesser of (a) any
                                  shortfall for the related month in interest collections
                                  resulting from the timing of Payoffs made from the 15th
                                  day of the calendar month preceding such Distribution Date
                                  to the last day of such month and (b) the monthly Master
                                  Servicing Fee, any reinvestment income realized by the
                                  Master Servicer relating to Payoffs made from the 15th day
                                  of the calendar month preceding such Distribution Date to
                                  the 14th day of the month of such Distribution Date and
                                  interest payments on Payoffs received during the period of
                                  the first day through the 14th day of the month of such
                                  Distribution Date. The amount so passed through will
                                  hereinafter be referred to as "Compensating Interest".
                                  Compensating Interest will be allocated to each Class of
                                  Certificates pro rata according to the amount of interest
                                  accrued thereon, and any remaining shortfall in interest
                                  collections resulting from the timing of Payoffs will be
                                  applied pro rata according to the amount of interest to
                                  which each Class of Certificates would otherwise be
                                  entitled in reduction thereof.
 
                                  See "Description of the Certificates -- Distributions of
                                  Interest" herein.
 
Principal (including Principal
 Prepayments)...................  GENERAL.  On each Distribution Date, Certificateholders
                                  will be entitled to receive principal distributions from
                                  the Available Distribution Amount to the extent and
                                  priority described herein. See "Description of the
                                  Certificates -- Priority of Distributions" and "--
                                  Distributions of Principal" herein. Except for limited
                                  circumstances described herein, the Class I Certificates
                                  (other than the Class IX Certificates which will not
                                  receive principal) will receive principal collected from
                                  Group I Loans and the Class II Certificates (other than
                                  the Class IIX and Class IIA-2 Certificates which will not
                                  receive principal) will receive principal collected from
                                  Group II Loans. The Class B Certificates will receive
                                  principal collected from Mortgage Loans in both Loan
                                  Groups.
 
                                  The Class IIA-2 and Class X Certificates will not receive
                                  any distributions of principal.
</TABLE>
 
                                      S-19
<PAGE>
 
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                                  CLASS IP PRINCIPAL DISTRIBUTION AMOUNT.  On each
                                  Distribution Date, the Class IP Certificates will receive
                                  a portion of the Available Distribution Amount for Loan
                                  Group I attributable to principal received on or in
                                  respect of any Group I Loan with a Pass-Through Rate of
                                  less than 7.000% (a "Class IP Mortgage Loan"), equal to
                                  the amount of such principal so attributable multiplied by
                                  a fraction, the numerator of which is 7.000% minus the
                                  Pass-Through Rate on such Class IP Mortgage Loan and the
                                  denominator of which is 7.000% (the "Class IP Fraction").
                                  In addition, on each Distribution Date for so long as any
                                  Class of Class B Certificates remains outstanding, the
                                  Class IP Certificates will also be allocated principal, to
                                  the extent of amounts available to pay the Subordinate
                                  Principal Distribution Amount (without regard to clause
                                  (B) of such definition) on such Distribution Date, in an
                                  amount generally equal to the Class IP Fraction of any
                                  loss on a Class IP Mortgage Loan other than a Special
                                  Hazard Loss in excess of the Special Hazard Coverage, a
                                  Fraud Loss in excess of the Fraud Coverage or a Bankruptcy
                                  Loss in excess of the Bankruptcy Coverage (each, as
                                  defined herein), such payments in respect of losses shall
                                  not cause a further reduction of the outstanding Class
                                  Principal Balance of the Class IP Certificates; PROVIDED,
                                  that if the amounts otherwise available to pay the
                                  Subordinate Principal Distribution Amount for any such
                                  Distribution Date are insufficient to cover such
                                  outstanding principal losses for the Class IP Certificates
                                  as provided above and Class IIP Certificates as provided
                                  below, then the amounts otherwise available to pay the
                                  Subordinate Principal Distribution Amount will be
                                  allocated pro rata to the Class IP and Class IIP
                                  Certificates based on the amount such Certificates are
                                  entitled to receive pursuant to this sentence, in the case
                                  of the Class IP Certificates, and the second sentence
                                  under "Class IIP Principal Distribution of Amount" below,
                                  in the case of the Class IIP Certificates. The aggregate
                                  of the amounts payable to the Class IP Certificates
                                  described in this paragraph are referred to herein as the
                                  "Class IP Principal Distribution Amount".
 
                                  CLASS IA PRINCIPAL DISTRIBUTION AMOUNT.  On each
                                  Distribution Date prior to the Credit Support Depletion
                                  Date, an amount, up to the amount of the Class IA
                                  Principal Distribution Amount (as defined below) for such
                                  Distribution Date, will be distributed as principal to the
                                  following Classes of Class IA Certificates and Residual
                                  Certificates in the following order of priority:
 
                                  (i)  first, to the Class IA-3 Certificates, an amount, up
                                  to the amount of the Class IA-3 Principal Distribution
                                       Amount (as defined below) for such Distribution Date,
                                       until the Class Principal Balance of the Class IA-3
                                       Certificates has been reduced to zero;
 
                                  (ii)  second, to the Residual Certificates, until the
                                        Class Principal Balances of the Residual
                                        Certificates have been reduced to zero;
</TABLE>
 
                                      S-20
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                                  (iii)  third, to the Class IA-1 Certificates, until the
                                         Class Principal Balance of the Class IA-1
                                         Certificates has been reduced to zero;
 
                                  (iv)  fourth, to the Class IA-2 Certificates, until the
                                        Class Principal Balance of the Class IA-2
                                        Certificates has been reduced to zero; and
 
                                  (v)  fifth, to the Class IA-3 Certificates, until the
                                       Class Principal Balance of the Class IA-3
                                       Certificates has been reduced to zero.
 
                                  The "Class IA Principal Distribution Amount" for any
                                  Distribution Date will equal the sum of (i) the Class IA
                                  Percentage (as defined below) of the Principal Payment
                                  Amount (as defined below) for Loan Group I (exclusive of
                                  the portion thereof attributable to the Class IP Principal
                                  Distribution Amount), (ii) the Class IA Prepayment
                                  Percentage (as defined below) of the Principal Prepayment
                                  Amount (as defined below) for Loan Group I (exclusive of
                                  the portion thereof attributable to the Class IP Principal
                                  Distribution Amount), and (iii) the Class IA Liquidation
                                  Amount (as defined below).
 
                                  The "Class IA Liquidation Amount" is the aggregate of, for
                                  each Group I Loan which became a Liquidated Mortgage Loan
                                  during the calendar month preceding the month of the
                                  Distribution Date, the lesser of (i) the Class IA
                                  Percentage of the principal balance of such Mortgage Loan
                                  (exclusive of the Class IP Fraction thereof, with respect
                                  to any Class IP Mortgage Loan) and (ii) the Class IA
                                  Prepayment Percentage of the Liquidation Principal with
                                  respect to such Mortgage Loan.
 
                                  "Liquidation Principal" is the principal portion of
                                  Liquidation Proceeds received with respect to each
                                  Mortgage Loan which became a Liquidated Mortgage Loan (as
                                  defined herein) (but not in excess of the principal
                                  balance thereof) during the calendar month preceding the
                                  month of the Distribution Date, exclusive of the portion
                                  thereof attributable to the applicable Class P Principal
                                  Distribution Amount. A "Liquidated Mortgage Loan" is a
                                  Mortgage Loan as to which the Master Servicer or a
                                  servicer has determined 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.
 
                                  The "Class IA Percentage" for any Distribution Date will
                                  equal the lesser of (a) 100% and (b) the sum of the Class
                                  Principal Balances of the Class IA Certificates and the
                                  Residual Certificates divided by the aggregate Stated
                                  Principal Balance of the Mortgage Loans in Loan Group I
                                  (less the Class IP Principal Balance), in each case
                                  immediately prior to the Distribution Date.
 
                                  The "Stated Principal Balance" of any Mortgage Loan as of
                                  any date of determination is equal to the principal
                                  balance thereof as of the Cut-Off Date, after application
                                  of all scheduled principal
</TABLE>
 
                                      S-21
<PAGE>
 
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                                  payments due on or before the Cut-Off Date, whether or not
                                  received, reduced by all amounts allocable to principal
                                  that have been distributed to Certificateholders with
                                  respect to such Mortgage Loan on or before such date, and
                                  as further reduced to the extent that any realized loss
                                  thereon has been allocated to one or more Classes of
                                  Certificates on or before the date of determination.
 
                                  The "Class IA-3 Principal Distribution Amount" for any
                                  Distribution Date will equal the sum of (i) the Class IA-3
                                  Percentage (as defined below) of the Principal Payment
                                  Amount for Loan Group I (exclusive of the portion thereof
                                  attributable to the Class IP Principal Distribution
                                  Amount), (ii) the Class IA-3 Prepayment Percentage (as
                                  defined herein) of the Principal Prepayment Amount for
                                  Loan Group I (exclusive of the portion thereof
                                  attributable to the Class IP Principal Distribution
                                  Amount) and (iii) the Class IA-3 Liquidation Amount (as
                                  defined below).
 
                                  The "Class IA-3 Percentage" for any Distribution Date will
                                  equal the lesser of (a) 100% and (b) the Class IA-3
                                  Principal Balance divided by the aggregate Stated
                                  Principal Balance of the Mortgage Loans in Loan Group I
                                  (less the Class IP Principal Balance), in each case
                                  immediately prior to the Distribution Date.
 
                                  The "Class IA-3 Liquidation Amount" is the aggregate of,
                                  for each Group I Loan which became a Liquidated Mortgage
                                  Loan during the calendar month preceding the month of the
                                  Distribution Date, the lesser of (i) the Class IA-3
                                  Percentage of the principal balance of such Mortgage Loan
                                  (exclusive of the Class IP Fraction thereof, if
                                  applicable) and (ii) the Class IA-3 Percentage on any
                                  Distribution Date occurring prior to the fifth anniversary
                                  of the first Distribution Date and the Class IA-3
                                  Prepayment Percentage (as defined herein) on any
                                  Distribution Date thereafter, in each case, of the
                                  Liquidation Principal with respect to such Mortgage Loan.
 
                                  For a description of the Class IA-3 Prepayment Percentage,
                                  see "Description of the Certificates -- Distributions of
                                  Principal -- CLASS IA PRINCIPAL DISTRIBUTION AMOUNT"
                                  herein.
 
                                  CLASS IIP PRINCIPAL DISTRIBUTION AMOUNT.  On each
                                  Distribution Date, the Class IIP Certificates will receive
                                  a portion of the Available Distribution Amount for Loan
                                  Group II attributable to principal received on or in
                                  respect of any Group II Loan with a Pass-Through Rate of
                                  less than 8.000% (a "Class IIP Mortgage Loan"), equal to
                                  the amount of such principal so attributable multiplied by
                                  a fraction, the numerator of which is 8.000% minus the
                                  Pass-Through Rate on such Class IIP Mortgage Loan and the
                                  denominator of which is 8.000% (the "Class IIP Frac-
                                  tion"). In addition, on each Distribution Date for so long
                                  as any Class of Class B Certificates remains outstanding,
                                  the Class IIP Certificates will also be allocated
                                  principal, to the extent of amounts available to pay the
                                  Subordinate Principal Distribution Amount (without regard
                                  to clause (B) of such definition) on such
</TABLE>
 
                                      S-22
<PAGE>
 
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<S>                               <C>
                                  Distribution Date, in an amount generally equal to the
                                  Class IIP Fraction of any loss on a Class IIP Mortgage
                                  Loan other than a Special Hazard Loss in excess of the
                                  Special Hazard Coverage, a Fraud Loss in excess of the
                                  Fraud Coverage or a Bankruptcy Loss in excess of the
                                  Bankruptcy Coverage (each, as defined herein), such
                                  payments in respect of losses shall not cause a further
                                  reduction of the outstanding Class Principal Balance of
                                  the Class IIP Certificates; PROVIDED, that if the amounts
                                  otherwise available to pay the Subordinate Principal
                                  Distribution Amount for any such Distribution Date are
                                  insufficient to cover such outstanding principal losses
                                  for the Class IIP and Class IP Certificates as provided
                                  above, then the amounts otherwise available to pay the
                                  Subordinate Principal Distribution Amount will be
                                  allocated pro rata to the Class IP and Class IIP Certifi-
                                  cates based on the amount such Certificates are entitled
                                  to receive pursuant to this sentence, in the case of the
                                  Class IIP Certificates, and the second sentence of the
                                  "Class IP Principal Distribution Amount" above, in the
                                  case of the Class IP Certificates. The aggregate of the
                                  amounts payable to the Class IIP Certificates described in
                                  this paragraph are referred to herein as the "Class IIP
                                  Principal Distribution Amount".
 
                                  CLASS IIA PRINCIPAL DISTRIBUTION AMOUNT.  On each
                                  Distribution Date prior to the Credit Support Depletion
                                  Date, an amount, up to the amount of the Class IIA
                                  Principal Distribution Amount (as defined below) for such
                                  Distribution Date, will be distributed as principal to the
                                  following Classes of Class IIA Certificates in the
                                  following order of priority:
 
                                  (i)  first, to the Class IIA-5 Certificates, an amount, up
                                  to the amount of the Class IIA-5 Principal Distribution
                                       Amount (as defined below) for such Distribution Date,
                                       until the Class IIA-5 Principal Balance has been re-
                                       duced to zero;
 
                                  (ii)  second, concurrently, 33.3333328439%, 33.3333343122%
                                        and 33.3333328439% of the Class IIA Principal
                                        Distribution Amount remaining after distributions in
                                        clause (i) above, to the Class IIA-6, Class IIA-1
                                        and Class IIA-7 Certificates, respectively, until
                                        the Class Principal Balances of the Class IIA-6 and
                                        Class IIA-7 Certificates have been reduced to zero;
 
                                  (iii)  third, concurrently, 20.0000000000% and
                                         80.0000000000% of the Class IIA Principal Distribu-
                                         tion Amount remaining after the distributions in
                                         clauses (i) and (ii) above to the Class IIA-1 and
                                         Class IIA-3 Certificates, respectively, until the
                                         Class IIA-1 Principal Balance and the Class IIA-3
                                         Principal Balance have been reduced to zero;
 
                                  (iv)  fourth, to the Class IIA-4 Certificates, all of the
                                        Class IIA Principal Distribution Amount remaining
</TABLE>
 
                                      S-23
<PAGE>
 
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<S>                               <C>
                                        after the distributions in clauses (i), (ii) and
                                        (iii) above, until the Class IIA-4 Principal Balance
                                        has been reduced to zero; and
 
                                  (v)  fifth, to the Class IIA-5 Certificates, all of the
                                  Class IIA Principal Distribution Amount remaining after
                                       the distributions in clauses (i), (ii), (iii) and
                                       (iv) above, until the Class IIA-5 Principal Balance
                                       has been reduced to zero.
 
                                  The "Class IIA Principal Distribution Amount" for any
                                  Distribution Date will equal the sum of (i) the Class IIA
                                  Percentage (as defined below) of the Principal Payment
                                  Amount for Loan Group II (exclusive of the portion thereof
                                  attributable to the Class IIP Principal Distribution
                                  Amount), (ii) the Class IIA Prepayment Percentage (as
                                  defined below) of the Principal Prepayment Amount for Loan
                                  Group II (exclusive of the portion thereof attributable to
                                  the Class IIP Principal Distribution Amount), and (iii)
                                  the Class IIA Liquidation Amount (as defined below).
 
                                  The "Class IIA Liquidation Amount" is the aggregate of,
                                  for each Group II Loan which became a Liquidated Mortgage
                                  Loan during the calendar month preceding the month of the
                                  Distribution Date, the lesser of (i) the Class IIA
                                  Percentage of the principal balance of such Mortgage Loan
                                  (exclusive of the Class IIP Fraction thereof, with respect
                                  to any Class IIP Mortgage Loan) and (ii) the Class IIA
                                  Prepayment Percentage of the Liquidation Principal with
                                  respect to such Mortgage Loan.
 
                                  The "Class IIA Percentage" for any Distribution Date will
                                  equal the lesser of (a) 100% and (b) the sum of the Class
                                  Principal Balances of the Class IIA Certificates divided
                                  by the aggregate Stated Principal Balance of the Mortgage
                                  Loans in Loan Group II (less the Class IIP Principal
                                  Balance), in each case immediately prior to the
                                  Distribution Date.
 
                                  The "Class IIA-5 Principal Distribution Amount" for any
                                  Distribution Date will equal the sum of (i) the Class
                                  IIA-5 Adjusted Percentage (as defined below) of the
                                  Principal Payment Amount for Loan Group II (exclusive of
                                  the portion thereof attributable to the Class IIP
                                  Principal Distribution Amount), (ii) the Class IIA-5
                                  Prepayment Percentage (as defined herein) of the Principal
                                  Prepayment Amount for Loan Group II (exclusive of the
                                  portion thereof attributable to the Class IIP Principal
                                  Distribution Amount) and (iii) the Class IIA-5 Liquidation
                                  Amount (as defined below).
 
                                  The "Class IIA-5 Adjusted Percentage" for any Distribution
                                  Date shall equal the product of the Class IIA-5 Percentage
                                  and the Lockout Percentage. The "Lockout Percentage" shall
                                  equal 0% for any Distribution Date occurring prior to the
                                  Distribution Date in January, 2002 and 100% for any
                                  Distribution Date occurring on or after the Distribution
                                  Date in January, 2002. The "Class IIA-5 Percentage" for
                                  any Distribution Date will equal the lesser of (a) 100%
                                  and (b) the Class IIA-5 Principal Balance
</TABLE>
 
                                      S-24
<PAGE>
 
<TABLE>
<S>                               <C>
                                  divided by the aggregate Stated Principal Balance of the
                                  Mortgage Loans in Loan Group II (less the Class IIP
                                  Principal Balance), in each case immediately prior to the
                                  Distribution Date.
 
                                  The "Class IIA-5 Liquidation Amount" is the aggregate of,
                                  for each Group II Loan which became a Liquidated Mortgage
                                  Loan during the calendar month preceding the month of the
                                  Distribution Date, the lesser of (i) the Class IIA-5
                                  Percentage of the principal balance of such Mortgage Loan
                                  (exclusive of the Class IIP Fraction thereof, if
                                  applicable) and (ii) the Class IIA-5 Percentage on any
                                  Distribution Date occurring prior to the fifth anniversary
                                  of the first Distribution Date, and the Class IIA-5
                                  Prepayment Percentage (as defined herein) on any
                                  Distribution Date thereafter, in each case, of the
                                  Liquidation Principal with respect to such Mortgage Loan.
 
                                  For a description of the Class IIA-5 Prepayment
                                  Percentage, see "Description of the Certificates --
                                  Distributions of Principal -- CLASS IIA PRINCIPAL
                                  DISTRIBUTION AMOUNT" herein.
 
                                  For any Distribution Date and for any Loan Group, the
                                  "Principal Payment Amount" is the sum of (i) scheduled
                                  principal payments on the Mortgage Loans in such Loan
                                  Group due on the related Due Date, (ii) the principal
                                  portion of repurchase proceeds received with respect to
                                  any Mortgage Loan in such Loan Group which was repurchased
                                  as permitted or required by the Pooling Agreement during
                                  the calendar month preceding the month of the Distribution
                                  Date and (iii) any other unscheduled payments of principal
                                  which were received from the Mortgage Loans in such Loan
                                  Group during the preceding calendar month, other than
                                  Payoffs, Curtailments or Liquidation Principal. For any
                                  Distribution Date and for any Loan Group, the "Principal
                                  Prepayment Amount" is the sum of (i) all Curtailments from
                                  the Mortgage Loans in such Loan Group which were received
                                  during the preceding calendar month and (ii) all Payoffs
                                  from the Mortgage Loans in such Loan Group received from
                                  the 15th day of the month immediately prior to the month
                                  of such Distribution Date through the 14th day of the
                                  month of such Distribution Date (except for Payoffs
                                  received from the Cut-Off Date through December 14, 1996,
                                  which will be passed through to holders of Certificates on
                                  the January 1997 Distribution Date). Except as described
                                  herein under "Description of the Certificates --
                                  Distributions of Principal -- CROSS-COLLATERALIZATION",
                                  principal distributions to the Class I Certificates will
                                  be based on the Principal Payment Amount, Principal
                                  Prepayment Amount and Liquidation Principal for the Group
                                  I Loans and principal distributions to the Class II
                                  Certificates will be based on the Principal Payment
                                  Amount, Principal Prepayment Amount and Liquidation
                                  Principal for the Group II Loans. Principal distributions
                                  to the Class B Certificates will be based on the Principal
                                  Payment Amount, Principal Prepayment Amount and
                                  Liquidation Principal for both Loan Groups.
 
                                  The "Class IA Prepayment Percentage" and "Class IIA
                                  Prepayment Percentage" for any Distribution Date occurring
                                  until the
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                                      S-25
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                                  fifth anniversary of the first Distribution Date will
                                  equal 100%. Thereafter, the Class IA and Class IIA
                                  Prepayment Percentages will, except as described herein,
                                  be subject to gradual reduction as described in
                                  "Description of the Certificates -- Distributions of
                                  Principal" herein. This will have the effect of
                                  accelerating the amortization of the Senior Certificates
                                  (other than the Class P Certificates and the Lockout
                                  Certificates), subject to the priorities described in
                                  "Description of the Certificates -- Distributions of
                                  Principal" herein, while increasing the proportionate
                                  interest in the Certificate Trust evidenced by the Lockout
                                  Certificates and Class B Certificates. Allocating a
                                  proportionately greater share of principal prepayments
                                  with respect to the Mortgage Loans in a Loan Group to the
                                  related Class A Certificates (other than the Lockout
                                  Certificates) is intended to enhance the likelihood that
                                  holders of such Certificates will be paid the full amount
                                  of principal to which they are entitled. See "Description
                                  of the Certificates -- Subordination and Allocation of
                                  Losses" herein.
 
                                  SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT.  On each
                                  Distribution Date, an amount, up to the amount of the
                                  Subordinate Principal Distribution Amount (as defined
                                  below) for such Distribution Date, will be distributed as
                                  principal to the Class B Certificates. On each
                                  Distribution Date, except on Distribution Dates on which
                                  the Subordination Level for any Class of Class B
                                  Certificates is less than such Subordination Level as of
                                  the Cut-Off Date, each Class of Class B Certificates will
                                  be entitled to receive its pro rata share by Class
                                  Principal Balance of the Subordinate Principal
                                  Distribution Amount, to the extent of the Available
                                  Distribution Amount for both Loan Groups remaining after
                                  distributions of interest and principal to the Senior
                                  Certificates, all distributions of interest and principal
                                  to all Classes of Class B Certificates senior to such
                                  Class and distributions of interest to such Class. See
                                  "Description of the Certificates -- Priority of
                                  Distributions" herein. The relative seniority, from
                                  highest to lowest, of the Classes of Class B Certificates
                                  shall be as follows: Class B-1, Class B-2, Class B-3,
                                  Class B-4, Class B-5 and Class B-6.
 
                                  The "Subordinate Principal Distribution Amount" for any
                                  Distribution Date will be equal to the excess of (A) the
                                  sum of (i) the Subordinate Percentage for Loan Group I of
                                  the Principal Payment Amount for Loan Group I (exclusive
                                  of the portion thereof attributable to the Class IP
                                  Principal Distribution Amount), (ii) the Subordinate
                                  Percentage for Loan Group II of the Principal Payment
                                  Amount for Loan Group II (exclusive of the portion thereof
                                  attributable to the Class IIP Principal Distribution
                                  Amount), (iii) the Subordinate Prepayment Percentage for
                                  Loan Group I of the Principal Prepayment Amount for Loan
                                  Group I (exclusive of the portion thereof attributable to
                                  the Class IP Principal Distribution Amount), (iv) the
                                  Subordinate Prepayment Percentage for Loan Group II of the
                                  Principal Prepayment Amount for Loan Group II (exclusive
                                  of the portion thereof attributable to the Class IIP
                                  Principal Distribution Amount)
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                                      S-26
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                                  and (v) the Subordinate Liquidation Amount over (B) the
                                  sum of (x) the amounts required to be distributed to the
                                  Class P Certificates pursuant to clause (iv) of paragraphs
                                  (a) and (b) under "Priority of Distributions" herein on
                                  such Distribution Date, (y) in the event that the Class
                                  Principal Balance of either the Class IA or Class IIA
                                  Certificates has been reduced to zero, principal paid from
                                  the Available Distribution Amount of the Loan Group
                                  related to such Class A Certificates to the remaining
                                  Class A Certificates and (z) amounts in respect of
                                  principal paid from the Available Distribution Amount of
                                  an Overcollateralized Group to an Undercollateralized
                                  Group as described in "Description of Certificates --
                                  Distribution of Principal -- CROSS-COLLATERALIZATION"
                                  herein.
 
                                  The "Subordinate Percentage" for Loan Group I for any
                                  Distribution Date will equal the excess of 100% over the
                                  Class IA Percentage.
 
                                  The "Subordinate Percentage" for Loan Group II for any
                                  Distribution Date will equal the excess of 100% over the
                                  Class IIA Percentage.
 
                                  The "Subordinate Liquidation Amount" will equal the
                                  excess, if any, of the aggregate Liquidation Principal for
                                  all Mortgage Loans which became Liquidated Mortgage Loans
                                  during the calendar month preceding the month of the
                                  Distribution Date, over the sum of the Class IA
                                  Liquidation Amount and the Class IIA Liquidation Amount.
 
                                  For a description of the Subordinate Prepayment
                                  Percentage, see "Description of the Certificates --
                                  Distributions of Principal -- SUBORDINATE DISTRIBUTION
                                  AMOUNT" herein.
 
                                  The rights of the holders of the Class B Certificates to
                                  receive distributions of interest and principal are
                                  subordinated to the rights of the holders of the Senior
                                  Certificates to receive scheduled distributions of
                                  interest and principal. See "Description of the
                                  Certificates -- Subordination and Allocation of Losses"
                                  herein.
 
Subordination and Allocation of
 Losses.........................  The Class B Certificates will be subordinate in right of
                                  payment to and provide credit support to the Senior
                                  Certificates, the Junior Subordinate Certificates will be
                                  subordinate in right of payment to and provide credit
                                  support to the Senior Subordinate Certificates, the Class
                                  B-3 Certificates will be subordinate in right of payment
                                  to and provide credit support to the Class B-1 and Class
                                  B-2 Certificates and the Class B-2 Certificates will be
                                  subordinate in right of payment to and provide credit
                                  support to the Class B-1 Certificates, to the extent de-
                                  scribed herein. The support provided by the Class B
                                  Certificates is intended to enhance the likelihood of
                                  regular receipt by the Senior Certificates of the full
                                  amount of the monthly distributions of interest (except
                                  the Class P Certificates, which are not entitled to
                                  interest) and principal (except the Class X and Class
                                  IIA-2 Certificates, which are not entitled to principal)
                                  to
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                                      S-27
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                                  which they are entitled and to afford such Certificates
                                  protection against certain losses. The protection afforded
                                  to the Senior Certificates by the Class B Certificates
                                  will be accomplished by the preferential right on each
                                  Distribution Date of the Senior Certificates to receive
                                  distributions of interest (except the Class P
                                  Certificates) and principal (except the Class X and Class
                                  IIA-2 Certificates) prior to distributions of interest or
                                  principal to the Class B Certificates. The support
                                  provided by the Junior Subordinate Certificates to the
                                  Senior Subordinate Certificates is intended to enhance the
                                  likelihood of regular receipt by the Senior Subordinate
                                  Certificates of the full amount of monthly distributions
                                  of interest and principal to which they are entitled and
                                  to afford such holders protection against certain losses.
                                  The protection afforded to the Senior Subordinate Certif-
                                  icates by the Junior Subordinate Certificates will be
                                  accomplished by the preferential right on each
                                  Distribution Date of the Senior Subordinate Certificates
                                  to receive distributions of interest and principal, prior
                                  to distributions of interest or principal to the Junior
                                  Subordinate Certificates.
 
                                  Except for Special Hazard Losses, Fraud Losses and
                                  Bankruptcy Losses in excess of the designated amounts of
                                  Special Hazard Coverage, Fraud Coverage and Bankruptcy
                                  Coverage (each, as defined herein), any loss realized with
                                  respect to a Mortgage Loan will be allocated among the
                                  Certificates (i) for losses allocable to principal (a)
                                  first, to the Junior Subordinate Certificates, until the
                                  aggregate Class Principal Balance thereof has been reduced
                                  to zero, (b) second, to the Class B-3 Certificates, until
                                  the Class B-3 Principal Balance has been reduced to zero,
                                  (c) third, to the Class B-2 Certificates, until the Class
                                  B-2 Principal Balance has been reduced to zero, (d)
                                  fourth, to the Class B-1 Certificates, until the Class B-1
                                  Principal Balance has been reduced to zero and (e) fifth,
                                  (x) in the case of losses on a Group I Loan, to the Class
                                  I Certificates, pro rata to the Classes of Class I
                                  Certificates, other than the Class IP Certificates,
                                  according to their Class Principal Balances in reduction
                                  of their respective Class Principal Balances and (y) in
                                  the case of losses on a Group II Loan, to the Class II
                                  Certificates, pro rata to the Classes of Class II
                                  Certificates, other than the Class IIP Certificates, ac-
                                  cording to their Class Principal Balances in reduction of
                                  their respective Class Principal Balances; PROVIDED,
                                  HOWEVER, that in each case if the loss is recognized with
                                  respect to a Class IP or Class IIP Mortgage Loan, the
                                  Class IP or Class IIP Fraction of such loss will first be
                                  allocated to the Class IP or Class IIP Certificates, as
                                  applicable, and the remainder of such loss will be
                                  allocated as described above in this clause (i), and (ii)
                                  for losses allocable to interest (a) first, to the Junior
                                  Subordinate Certificates, in reduction of accrued but
                                  unpaid interest thereon and then in reduction of the
                                  aggregate Class Principal Balance, (b) second, to the
                                  Class B-3 Certificates, in reduction of accrued but unpaid
                                  interest thereon and then in reduction of the Class B-3
                                  Principal Balance, (c) third, to the Class B-2 Certifi-
                                  cates, in reduction of accrued but unpaid interest thereon
                                  and
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                                      S-28
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                                  then in reduction of the Class B-2 Principal Balance, (d)
                                  fourth, to the Class B-1 Certificates, in reduction of
                                  accrued but unpaid interest thereon and then in reduction
                                  of the Class B-1 Principal Balance and (e) fifth, (x) in
                                  the case of losses on a Group I Loan, to the Class I
                                  Certificates, other than the Class IP Certificates, pro
                                  rata according to accrued but unpaid interest thereon and
                                  then pro rata according to their Class Principal Balances
                                  in reduction of their respective Class Principal Balances
                                  and (y) in the case of losses on a Group II Loan, to the
                                  Class II Certificates, other than the Class IIP
                                  Certificates, pro rata according to accrued but unpaid
                                  interest thereon and then pro rata according to their
                                  Class Principal Balances in reduction of their respective
                                  Class Principal Balances. The allocation of the principal
                                  portion of losses relating to a Mortgage Loan to all
                                  Classes of Certificates, other than the Class P
                                  Certificates, pro rata according to their respective Class
                                  Principal Balances except if the loss is recognized with
                                  respect to a Class IP or Class IIP Mortgage Loan, the
                                  applicable Class P Fraction of such loss will first be
                                  allocated to the related Class P Certificates, and the
                                  allocation of the interest portion of losses pro rata
                                  according to the amount of interest accrued on each such
                                  Class in reduction thereof and then in reduction of their
                                  related Class Principal Balances, is hereinafter referred
                                  to as "Pro Rata Allocation".
 
                                  Special Hazard Losses, Fraud Losses and Bankruptcy Losses
                                  for Mortgage Loans in a Loan Group in excess of the
                                  applicable coverage will be allocated to all outstanding
                                  Classes of Certificates by Pro Rata Allocation. Each of
                                  the coverages for such losses may be reduced periodically,
                                  as described herein. Investors in the Senior Certificates
                                  should be aware that the applicable coverages for such
                                  losses cover Mortgage Loans in both Loan Groups.
                                  Therefore, in the event Mortgage Loans in a Loan Group
                                  suffer a high level of Special Hazard Losses, Fraud Losses
                                  or Bankruptcy Losses, it will reduce the available
                                  coverage for the Senior Certificates relating to both Loan
                                  Groups and also may cause Senior Certificates to suffer
                                  losses in the event Mortgage Loans in any Loan Group
                                  suffer such losses after the available coverage has been
                                  exhausted. See "Description of the Certificates --
                                  Subordination and Allocation of Losses" herein.
 
                                  On each Distribution Date, after giving effect to the
                                  principal distributions and allocation of losses as
                                  described above, if the Certificate Principal Balance of
                                  all outstanding Certificates exceed the aggregate Stated
                                  Principal Balance of the Mortgage Loans, as of such date,
                                  then the excess of the Certificate Principal Balance of
                                  the Certificates over such aggregate Stated Principal
                                  Balance will be deemed to be a principal loss, which will
                                  be allocated to the most junior Class of Subordinate
                                  Certificates.
 
                                  Investors in the Senior Certificates should be aware that
                                  because the Class B Certificates represent interests in
                                  both Loan Groups, the Certificate Principal Balances of
                                  Class B Certificates could be reduced to zero as a result
                                  of a disproportionate amount of losses on the Mortgage
                                  Loans in one Loan Group.
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                                      S-29
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                                  Therefore, notwithstanding that losses on the Mortgage
                                  Loans in one Loan Group may only be allocated to the
                                  related Senior Certificates (except for Special Hazard
                                  Losses, Fraud Losses and Bankruptcy Losses in excess of
                                  the applicable coverage amounts), the allocation to the
                                  Class B Certificates of losses on the Mortgage Loans in
                                  the other Loan Group will increase the likelihood that
                                  losses may be allocated to such Senior Certificates.
 
                                  See also "Description of the Certificates -- Distributions
                                  of Principal" herein.
 
Credit Enhancements.............  SUBORDINATION.  The holders of the Senior Certificates are
                                  entitled to receive distributions of interest (except the
                                  Class P Certificates, which are not entitled to interest)
                                  and principal (except the Class X and Class IIA-2
                                  Certificates, which are not entitled to principal) before
                                  distributions of interest or principal to the holders of
                                  the Class B Certificates. See "Description of the Cer-
                                  tificates -- Priority of Distributions" herein. Losses on
                                  the Mortgage Loans will be allocated, in each case until
                                  the applicable Class Principal Balances have been reduced
                                  to zero, first, to the Junior Subordinate Certificates;
                                  second, to the Class B-3 Certificates; third, to the Class
                                  B-2 Certificates; fourth, to the Class B-1 Certificates;
                                  fifth, to the outstanding Classes of Senior Certificates
                                  in the manner described herein; PROVIDED, HOWEVER, that if
                                  the loss is recognized with respect to a Class IP Mortgage
                                  Loan, then the Class IP Fraction of such loss will first
                                  be allocated to the Class IP Certificates and the
                                  remainder of such loss will be allocated as described
                                  above; PROVIDED, FURTHER, that if the loss is recognized
                                  with respect to a Class IIP Mortgage Loan, then the Class
                                  IIP Fraction of such loss will first be allocated to the
                                  Class IIP Certificates and the remainder of such loss will
                                  be allocated as described above; and PROVIDED, FURTHER,
                                  that only a certain specified amount of Special Hazard
                                  Losses, Fraud Losses and Bankruptcy Losses will be
                                  allocated solely to the Class B Certificates, following
                                  which such losses will be allocated among all outstanding
                                  Classes of Certificates by Pro Rata Allocation. See
                                  "Description of the Certificates -- Subordination and
                                  Allocation of Losses" herein.
 
                                  On each Distribution Date, after giving effect to the
                                  principal distributions and allocation of losses as
                                  described above, if the Certificate Principal Balance of
                                  all outstanding Certificates exceed the aggregate Stated
                                  Principal Balance of the Mortgage Loans, as of such date,
                                  then the excess of the Certificate Principal Balance of
                                  the Certificates over such aggregate Stated Principal
                                  Balance will be deemed to be a principal loss, which will
                                  be allocated to the most junior Class of Subordinate
                                  Certificates.
 
                                  SHIFTING OF INTERESTS.  The Senior Certificates entitled
                                  to principal, other than the Lockout Certificates, will
                                  receive 100% of Principal Prepayments received with
                                  respect to the Mortgage Loans in the related Loan Group
                                  until the fifth anniversary of
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                                      S-30
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                                  the first Distribution Date. During the next four years,
                                  the Senior Certificates, other than the Lockout
                                  Certificates, will receive a disproportionately large, but
                                  decreasing, share of Principal Prepayments received with
                                  respect to the Mortgage Loans in the related Loan Group.
                                  This will result in an acceleration of the amortization of
                                  such Senior Certificates, other than the Lockout
                                  Certificates, subject to the priorities described in
                                  "Description of the Certificates -- Distributions of
                                  Principal" herein, enhancing the likelihood that holders
                                  of such Classes of Certificates will be paid the full
                                  amount of principal to which they are entitled.
 
Advances........................  With respect to each Mortgage Loan, the Master Servicer
                                  will make Advances on each Distribution Date to the
                                  Certificate Account to cover any shortfall between (i)
                                  payments scheduled to be received in respect of such
                                  Mortgage Loan and (ii) the amounts actually deposited in
                                  the Certificate Account on account of such payments;
                                  provided that the Master Servicer determines, in good
                                  faith, on such Distribution Date that such Advances will
                                  be recoverable from Insurance Proceeds, Liquidation
                                  Proceeds or other amounts received with respect to such
                                  Mortgage Loan. Advances are reimbursable to the Master
                                  Servicer from cash in the Certificate Account prior to
                                  payments to the Certificateholders if the Master Servicer
                                  determines that any such Advances previously made are not
                                  recoverable from Insurance Proceeds, Liquidation Proceeds
                                  or other amounts recoverable with respect to the
                                  applicable Mortgage Loan. See "Description of the
                                  Certificates -- Advances" herein.
 
Yield and Prepayment Considera-
 tions..........................  The effective yield to maturity of each Class of
                                  Certificates will depend upon, among other things, the
                                  price at which such Certificates are purchased, the
                                  applicable Remittance Rate, the actual characteristics of
                                  the Mortgage Loans in the related Loan Group, the rate of
                                  principal payments (including Principal Prepayments) on
                                  the Mortgage Loans in the related Loan Group and the rate
                                  of liquidations on the Mortgage Loans in the related Loan
                                  Group. A higher than anticipated rate of principal pay-
                                  ments (including Principal Prepayments) and liquidations
                                  would reduce the aggregate principal balance of the
                                  Mortgage Loans more quickly than expected, thereby
                                  reducing the aggregate interest payments with respect to
                                  such Mortgage Loans. Therefore, a higher rate of principal
                                  payments (including Principal Prepayments) and
                                  liquidations in a Loan Group could result in a lower than
                                  expected yield to maturity on related Classes of
                                  Certificates purchased at a premium. Conversely, a lower
                                  than anticipated rate of principal payments (including
                                  Principal Prepayments) and liquidations in a Loan Group
                                  could reduce the return on any related Class of
                                  Certificates purchased at a discount, in that payments of
                                  principal with respect to the Mortgage Loans in such Loan
                                  Group would occur later than anticipated. Except as
                                  described herein under "Description of the Certificates --
                                  Distribution of Principal -- CROSS-COLLATERALIZATION",
                                  principal distributions to the Class I Certificates and
                                  Class II Certificates relate to principal payments on
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                                      S-31
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                                  the Group I Loans and Group II Loans, respectively, and
                                  principal distributions to the Class B Certificates relate
                                  to principal payments on both Group I Loans and Group II
                                  Loans.
 
                                  The actual rate of payments of principal (including
                                  Principal Prepayments) and liquidations on the Mortgage
                                  Loans may be influenced by a variety of economic,
                                  geographic, social and other factors. In general, if
                                  interest rates generally rise above the interest rates on
                                  the Mortgage Loans, the rate of prepayment would be
                                  expected to decrease. Conversely, if prevailing interest
                                  rates fall significantly below the interest rates on the
                                  Mortgage Loans, the Mortgage Loans are likely to be
                                  subject to higher prepayment rates than if prevailing
                                  rates remain at or above the interest rates on the
                                  Mortgage Loans. See "Risk Factors" and "Yield and
                                  Prepayment Considerations" herein.
 
Special Yield and Prepayment
 Considerations.................  The yields to maturity on the Class X and Class P
                                  Certificates will be extremely sensitive to the level of
                                  Principal Prepayments on the Mortgage Loans in the related
                                  Loan Group. The interest payable to the Class IX
                                  Certificates is based on the weighted average of the
                                  Stripped Interest Rates (as defined herein) of the 15-Year
                                  Premium Rate Mortgage Loans. The interest payable to the
                                  Class IIX Certificates is based on the weighted average of
                                  the Stripped Interest Rates of the 30-Year Premium Rate
                                  Mortgage Loans. Therefore the yield to maturity on the
                                  Class X Certificates will generally decrease as a result
                                  of faster than expected Principal Prepayments on such
                                  Premium Rate Mortgage Loans. Prospective investors should
                                  fully consider the risks associated with an investment in
                                  the Class X Certificates, including the possibility that
                                  if the rate of Principal Prepayments on the Mortgage Loans
                                  in the related Loan Group is rapid, such investors may not
                                  fully recoup their initial investments. Because the prin-
                                  cipal payable with respect to the Class IP Certificates
                                  (which are entitled to receive distributions of principal
                                  only) is derived from Group I Loans with Pass-Through
                                  Rates that are lower than 7.000%, the yield to maturity on
                                  the Class IP Certificates will be adversely affected by
                                  slower than expected prepayments of Group I Loans with
                                  Pass-Through Rates less than 7.000%. Because the principal
                                  payable with respect to the Class IIP Certificates (which
                                  are entitled to receive distributions of principal only)
                                  is derived from Group II Loans with Pass-Through Rates
                                  that are lower than 8.000%, the yield to maturity on the
                                  Class IIP Certificates will be adversely affected by
                                  slower than expected prepayments of Group II Loans with
                                  Pass-Through Rates less than 8.000%. Because the interest
                                  payable on the Class IX and Class IIX Certificates and the
                                  principal distributable to the Class IP and Class IIP
                                  Certificates are for the most part derived from different
                                  groups of Mortgage Loans within the related Loan Group, it
                                  is possible that faster than expected prepayments with
                                  respect to the Class X Certificates may occur at the same
                                  time as slower than expected prepayments with respect to
                                  the Class P Certificates. See "Yield and Prepayment
                                  Considerations" herein.
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                                  The yield to maturity on the Floater Certificates will be
                                  sensitive to fluctuations in the level of LIBOR, and the
                                  yield to maturity on the Inverse Floater Certificates will
                                  be extremely sensitive to fluctuations in the level of
                                  LIBOR and to the rate of Principal Prepayments on the
                                  Group II Loans. Prospective investors should fully
                                  consider the risks associated with an investment in the
                                  Inverse Floater Certificates, including the possibility
                                  that if the rate of Principal Prepayments on the Group II
                                  Loans is rapid or if the level of LIBOR is high, investors
                                  in the Inverse Floater Certificates may not fully recoup
                                  their initial investments. In addition, in the event of
                                  very high Principal Prepayments of Group I Loans and the
                                  reduction of the Class IA Principal Balance to zero,
                                  subject to certain limitations set forth herein, all
                                  principal (after giving effect to the distribution to the
                                  Class IP Certificates) of the Group I Loans will be
                                  distributed to the Class IIA Certificates, and therefore,
                                  may adversely affect the yield of the Inverse Floater
                                  Certificates. See "Yield and Prepayment Considerations"
                                  herein.
 
                                  The yield to maturity on each Class of the Senior
                                  Subordinate Certificates will be extremely sensitive to
                                  realized losses on the Mortgage Loans (other than Special
                                  Hazard Losses, Fraud Losses and Bankruptcy Losses in
                                  excess of the applicable coverage therefor provided by the
                                  Class B Certificates), because a disproportionately large
                                  amount of such losses (rather than a pro rata portion
                                  thereof) generally will be allocable to such Classes of
                                  Certificates following the reduction of the aggregate of
                                  the Class Principal Balances of the Junior Subordinate
                                  Certificates to zero as described under "Description of
                                  the Certificates -- Subordination and Allocation of
                                  Losses" herein.
 
                                  LOCKOUT CERTIFICATES:  Although the Lockout Certificates
                                  are Senior Certificates, the Class IIA-5 Certificates will
                                  generally not be entitled to receive any principal
                                  distributions until January 2002 (other than the Class
                                  IIA-5 Liquidation Amount) and the Class IA-3 Certificates
                                  will not be entitled to receive any Principal Prepayments
                                  until January 2002. Therefore, the Class IA-3 and Class
                                  IIA-5 Certificates will not be entitled to receive the
                                  disproportionate allocation of Principal Prepayments that
                                  the other Senior Certificates are entitled to receive.
 
Ratings.........................  It is a condition to the issuance of the Offered
                                  Certificates that the Senior Certificates be rated "Aaa"
                                  by Moody's Investors Service ("Moody's") and "AAA" by Duff
                                  & Phelps Credit Rating Co. ("DCR" and, together with
                                  Moody's, the "Rating Agencies") and that the Class B-1
                                  Certificates be rated not less than "Aa2" by Moody's and
                                  "AA" by DCR, the Class B-2 Certificates be rated not less
                                  than "A2" by Moody's and "A" by DCR and the Class B-3
                                  Certificates be rated not less than "Baa2" by Moody's and
                                  "BBB" by DCR. See "Certificate Ratings", "Risk Factors"
                                  and "Yield and Prepayment Considerations" herein. The rat-
                                  ings on the Offered Certificates address the likelihood of
                                  the receipt by holders of Offered Certificates of all
                                  distributions with respect to the underlying Mortgage
                                  Loans to which they are
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                                      S-33
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                                  entitled and do not address the likely actual rate of
                                  Principal Prepayments, which rate could, if different than
                                  originally anticipated, adversely affect the yield
                                  realized by Certificateholders or cause the Class X or
                                  Class IIA-2 Certificateholders to fail to recoup their
                                  underlying investments.
 
Last Scheduled Distribution
 Date...........................  The Last Scheduled Distribution Date for all Classes of
                                  Certificates is January 25, 2027, which is the
                                  Distribution Date in the month after the scheduled
                                  maturity date for the latest maturing Mortgage Loan in the
                                  Mortgage Pool.
 
                                  The actual rate of principal payments on the Certificates
                                  will depend on the rate of payments of principal
                                  (including Principal Prepayments) on the Mortgage Loans
                                  which, in turn, may be influenced by a variety of
                                  economic, geographic and social factors, as well as the
                                  level of prevailing interest rates. No assurance can be
                                  given as to the actual payment experience on the Mortgage
                                  Loans. See "Description of the Certificates -- Last
                                  Scheduled Distribution Date" and "Yield and Prepayment
                                  Considerations" herein.
 
Legal Investment................  As of the date of their issuance, the Offered
                                  Certificates, other than the Class B-2 and Class B-3
                                  Certificates, will constitute "mortgage related
                                  securities" for purposes of the Secondary Mortgage Market
                                  Enhancement Act of 1984 ("SMMEA"). SMMEA provides that
                                  states may override its provisions on legal investment and
                                  restrict or condition investment in mortgage related
                                  securities by taking statutory action prior to October 4,
                                  1991. Certain states have enacted legislation which has
                                  overridden the provisions of SMMEA. See "Certain Legal
                                  Investment Aspects" herein.
 
                                  Institutions whose investment activities are subject to
                                  review by certain regulatory authorities may be or may
                                  become subject to restrictions on investment in the
                                  Offered Certificates, and such restrictions may be
                                  retroactively imposed. The Federal Financial Institutions
                                  Examination Council, the Federal Deposit Insurance
                                  Corporation, the Office of the Comptroller of the Cur-
                                  rency, the Board of Governors of the Federal Reserve
                                  System, the Office of Thrift Supervision and the National
                                  Credit Union Administration have adopted guidelines, and
                                  have proposed policies, regarding the suitability of
                                  investments in various types of derivative mortgage-backed
                                  securities, including securities such as the Offered
                                  Certificates. In addition, several states have adopted or
                                  are considering regulations that would prohibit regulated
                                  institutions subject to their jurisdiction from holding
                                  mortgage-backed securities such as the Offered
                                  Certificates, including such securities previously
                                  purchased. Investors should consult their own legal
                                  advisors in determining whether and to what extent the
                                  Offered Certificates constitute legal investments for such
                                  investors.
 
ERISA Considerations............  See "ERISA Considerations" herein and in the Prospectus.
</TABLE>
 
                                      S-34
<PAGE>
 
<TABLE>
<S>                               <C>
Certain Federal Income Tax
 Consequences...................  For federal income tax purposes, the Company will cause
                                  elections to be made to treat the Mortgage Trust, the
                                  First Level Certificate Trust and the Certificate Trust as
                                  "real estate mortgage investment conduits" (each, a
                                  "REMIC"). The certificates issued by the Mortgage Trust,
                                  the First Level Certificate Trust and the Certificate
                                  Trust, other than the Class R-1, Class R-2 and Class R
                                  Certificates, will be designated as REMIC regular
                                  interests. As REMIC regular interests, such certificates
                                  will generally be treated as debt for federal income tax
                                  purposes. Certificateholders will be required to include
                                  in income all interest and original issue discount ("OID")
                                  on such certificates in accordance with the accrual method
                                  of accounting regardless of the certificateholders' usual
                                  methods of accounting. For federal income tax purposes,
                                  (i) the Class R-1 Certificates will be the "residual
                                  interest" in the Mortgage Trust, (ii) the Class R-2
                                  Certificates will be the "residual interest" in the First
                                  Level Certificate Trust, and (iii) the Class R
                                  Certificates will be the "residual interest" in the
                                  Certificate Trust.
 
                                  The Class IIA-2, Class IX, Class IIX, Class IP and Class
                                  IIP Certificates will, and the Class IA-2, Class IIA-6 and
                                  Class B-1 Certificates may, be treated as having been
                                  issued with OID for federal income tax purposes. Certain
                                  Classes of Certificates may be treated for federal income
                                  tax purposes as having been issued at a premium. The
                                  prepayment assumption that will be used in determining the
                                  rate of accrual of market discount and premium, if any,
                                  for federal income tax purposes is 260% of the Basic
                                  Prepayment Assumption as described herein under "Yield and
                                  Prepayment Considerations". The Basic Prepayment Assump-
                                  tion represents an assumed annual rate of prepayment
                                  relative to the then outstanding principal balance of a
                                  pool of mortgages which increases incrementally each month
                                  after origination until the 30th month after origination,
                                  when the rate remains constant at 6% per annum. No
                                  representation is made that the Mortgage Loans will prepay
                                  at any given percentage of the Basic Prepayment
                                  Assumption.
 
                                  If actual prepayments differ sufficiently from the
                                  prepayment assumption, the calculation of OID for certain
                                  Classes of Offered Certificates might produce a negative
                                  number for certain accrual periods. In such event,
                                  Certificateholders will not be entitled to a deduction for
                                  such amount, but will be required to carry such amount
                                  forward as an offset to OID, if any, accruing in future
                                  accrual periods.
 
                                  Under the REMIC Regulations (as defined herein), the
                                  Residual Certificates will not be regarded as having
                                  "significant value" for purposes of applying the rules
                                  relating to "excess inclusions". In addition, the Residual
                                  Certificates may constitute "noneconomic" residual
                                  interests for purposes of the REMIC Regulations. Transfers
                                  of the Residual Certificates will be restricted under the
                                  Pooling Agreement to United States Persons (as defined in
                                  the Prospectus) in a manner designed to prevent a
</TABLE>
 
                                      S-35
<PAGE>
 
<TABLE>
<S>                               <C>
                                  transfer of a noneconomic residual interest from being
                                  disregarded under the REMIC Regulations. See "Certain
                                  Federal Income Tax Consequences -- Special Tax
                                  Considerations Applicable to the Residual Certificates"
                                  herein and "Certain Federal Income Tax Consequences --
                                  Taxation of Owners of REMIC Residual Certificates --
                                  Excess Inclusions" and "-- Noneconomic REMIC Residual
                                  Certificates" in the Prospectus.
 
                                  The Residual Certificateholders may be required to report
                                  an amount of taxable income with respect to the early
                                  years of the REMIC's term that significantly exceeds
                                  distributions on the Residual Certificates during such
                                  years, with corresponding tax deductions or losses
                                  deferred until the later years of the REMIC's term.
                                  Accordingly, on a present value basis, the tax detriments
                                  occurring in the earlier years may substantially exceed
                                  the sum of any tax benefits in the later years. As a
                                  result, the Residual Certificateholders' after-tax rate of
                                  return may be zero or negative, even if their pre-tax rate
                                  of return is positive.
 
                                  The Offered Certificates will generally be treated as
                                  "qualifying real property loans" for mutual savings banks
                                  and domestic building and loan associations, "loans
                                  secured by an interest in real property" for domestic
                                  building and loan associations, and "real estate assets"
                                  for real estate investment trusts ("REITs") in the same
                                  proportion that the assets in the REMIC would be so
                                  treated. In addition, interest on the Offered Certificates
                                  will generally be treated as "interest on obligations
                                  secured by mortgages on real property" for REITs to the
                                  extent that such Certificates are treated as "real estate
                                  assets". See "Certain Federal Income Tax Consequences" in
                                  the Prospectus.
 
                                  For further information regarding the federal income tax
                                  consequences of investing in the Offered Certificates, see
                                  "Certain Federal Income Tax Consequences" herein and in
                                  the Prospectus.
</TABLE>
 
                                      S-36
<PAGE>
                                  RISK FACTORS
 
GENERAL
 
    Distributions of principal and interest to the Class I Certificates and
Class II Certificates generally relate to collections of principal and interest
on Group I Loans and Group II Loans, respectively. The Class B Certificates'
interest and principal distributions relate to collections of principal and
interest on both Group I Loans and Group II Loans. In certain limited instances
as described herein, principal payments on Mortgage Loans in a Loan Group will
be applied to a Class or Classes of Senior Certificates relating to the other
Loan Group. In such a circumstance, the rate of Principal Prepayments of the
Mortgage Loans in the other Loan Group may affect the yield to maturity of the
unrelated Senior Certificates as well as the related Senior Certificates.
 
    The rate of principal payments, amount of each interest payment and yield to
maturity on each Class of the Certificates are directly related to the rate of
payments of principal on the Mortgage Loans in the related Loan Group, which may
be in the form of scheduled amortization, principal prepayments or liquidations.
In certain limited circumstances, as described herein, principal payments for
the Mortgage Loans in a Loan Group will be distributed to Senior Certificates
relating to the other Loan Group, and therefore, could affect the yield to
maturity of such Senior Certificates. In general, when the level of prevailing
mortgage interest rates declines significantly below the interest rates on the
Mortgage Loans, the rate of prepayment is likely to increase, although the
prepayment rate is influenced by a number of other factors, including general
economic conditions and homeowner mobility. The rate of payment of principal
will also be affected by any repurchase by the Company of the Mortgage Loans in
the related Loan Group. See "Maturity, Average Life and Prepayment Assumptions"
and "Description of Certificates -- Termination" in the Prospectus and
"Description of the Certificates -- Optional Termination of the Mortgage Trust"
and "Yield and Prepayment Considerations" herein. In such event, the repurchase
price paid by the Company would be passed through to related Certificateholders
on the Distribution Date following the month of repurchase. All of the Mortgage
Loans contain "due-on-sale" clauses. Consequently, acceleration of maturity as a
result of transfers of Mortgaged Properties will affect the level of prepayments
on the Mortgage Loans.
 
    If any Certificate is purchased at a discount from its original Certificate
Principal Balance, and if a purchaser of such Certificate calculates the yield
to maturity based on an assumed rate of principal payments (including Principal
Prepayments) and liquidations faster than that actually received on the Mortgage
Loans in the related Loan Group, the actual yield to maturity will be lower than
that so calculated. If any Certificate is purchased at a premium from its
original Certificate Principal Balance, and if a purchaser of such Certificate
calculates the yield to maturity based on an assumed rate of principal payments
(including Principal Prepayments) and liquidations slower than that actually
received on the Mortgage Loans in the related Loan Group, the actual yield to
maturity will be lower than that so calculated.
 
    The yield to maturity on the Floater Certificates will be sensitive to the
fluctuations in the level of LIBOR (as defined herein), and the yield to
maturity on the Inverse Floater Certificates will be extremely sensitive to
fluctuations in the level of LIBOR and to the rate of Principal Prepayments on
the Group II Loans. Prospective investors should fully consider the risks
associated with an investment in the Inverse Floater Certificates, including the
possibility that if the rate of Principal Prepayments on the Group II Loans is
rapid or if the level of LIBOR is high, investors in the Class IIA-2
Certificates may not fully recoup their initial investments. See "Yield and
Prepayment Considerations" herein. In addition, in the event of very high
Principal Prepayments of Group I Loans and the reduction of the Class IA
Principal Balance to zero, subject to certain limitations set forth herein, all
principal (after giving effect to the distributions to the Class IP
Certificates) of the Group I Loans will be distributed to the Class IIA
Certificates, and therefore, may adversely affect the yield of the Inverse
Floater Certificates.
 
    The yields to maturity on the Class X and Class P Certificates will be
extremely sensitive to the level of Principal Prepayments on the Mortgage Loans
in the related Loan Group. The interest
 
                                      S-37
<PAGE>
payable to the Class IX Certificates is based on the weighted average of the
Stripped Interest Rates (as defined herein) of the Group I Loans having
Pass-Through Rates in excess of 7.000% (the "15-Year Premium Rate Mortgage
Loans"). The interest payable to the Class IIX Certificates is based on the
weighted average of the Stripped Interest Rates of the Group II Loans in excess
of 8.000% (the "30-Year Premium Rate Mortgage Loans"). Therefore the yield to
maturity on the Class X Certificates will generally decrease as a result of
faster than expected Principal Prepayments on such Premium Rate Mortgage Loans.
Prospective investors should fully consider the risks associated with an
investment in the Class X Certificates, including the possibility that if the
rate of Principal Prepayments on the Mortgage Loans in the related Loan Group is
rapid, such investors may not fully recoup their initial investments. Because
the principal payable with respect to the Class IP Certificates (which are
entitled to receive distributions of principal only) is derived from Group I
Loans with Pass-Through Rates that are lower than 7.000%, the yield to maturity
on the Class IP Certificates will be adversely affected by slower than expected
prepayments of Group I Loans with Pass-Through Rates less than 7.000%. Because
the principal payable with respect to the Class IIP Certificates (which are
entitled to receive distributions of principal only) is derived from Group II
Loans with Pass-Through Rates that are lower than 8.000%, the yield to maturity
on the Class IIP Certificates will be adversely affected by slower than expected
prepayments of Group II Loans with Pass-Through Rates less than 8.000%. Because
the interest payable on the Class IX and Class IIX Certificates and the
principal distributable to the Class IP and Class IIP Certificates are for the
most part derived from different groups of Mortgage Loans within the related
Loan Group, it is possible that faster than expected Principal Prepayments with
respect to the Class X Certificates may occur at the same time as slower than
expected Principal Prepayments with respect to the Class P Certificates. See
"Yield and Prepayment Considerations" herein.
 
    Although the Lockout Certificates are Senior Certificates, the Class IIA-5
Certificates will generally not be entitled to receive any principal
distributions until January 2002 (other than the Class II A-5 Liquidation
Amount) and the Class IA-3 Certificates will not be entitled to receive any
Principal Prepayments until January 2002. Therefore, the Class IA-3 and Class
IIA-5 Certificates will not be entitled to receive the disproportionate
allocation of Principal Prepayments that the other Senior Certificates are
entitled to receive. See "Description of the Certificates -- Distributions of
Principal" and "Yield and Prepayment Considerations" herein.
 
    The yield to maturity on each Class of the Senior Subordinate Certificates
will be extremely sensitive to realized losses on the Mortgage Loans (other than
Special Hazard Losses, Fraud Losses and Bankruptcy Losses in excess of the
applicable coverage therefor provided by the Class B Certificates), because a
disproportionately large amount of such losses (rather than a pro rata portion
thereof) generally will be allocable to such Classes of Certificates following
the reduction of the aggregate of the Class Principal Balances of the Junior
Subordinate Certificates to zero, as described under "Description of the
Certificates -- Subordination and Allocation of Losses" herein.
 
    Investors in the Senior Certificates should be aware that the applicable
coverages for Special Hazard Losses, Fraud Losses and Bankruptcy Losses cover
Mortgage Loans in both Loan Groups. Therefore, in the event Mortgage Loans in a
Loan Group suffer a high level of such losses, it will reduce the available
coverage for the Senior Certificates in both Loan Groups and therefore may cause
Senior Certificates relating to the other Loan Group to suffer losses in the
event any Mortgage Loan suffers such a loss after the available coverage has
been exhausted.
 
    In the event the Class II Certificates are the Undercollateralized Group,
the reduction in the Available Distribution Amount of the Overcollateralized
Group to pay interest to the Undercollateralized Group as described above may
cause a shortfall in the amount of principal and interest otherwise
distributable to the Class B Certificates and further to the amount of principal
otherwise distributable to the Class IA Certificates because the Class I
Certificates have Remittance Rates less than the Class II Certificates. Such
shortfall shall be payable from amounts otherwise distributable first from the
Subordinate Certificates in reverse order of their priority of payment and then
from the Class IA Certificates in respect of principal.
 
                                      S-38
<PAGE>
BOOK-ENTRY SYSTEM
 
    Since transactions in the Class A Certificates (the "Book-Entry
Certificates") generally can be effected only through The Depository Trust
Company ("DTC"), participating organizations, indirect participants and certain
banks, the ability of a Certificateholder to pledge a Book-Entry Certificate to
persons or entities that do not participate in the DTC system, or otherwise to
take actions with respect to such Certificates, may be limited due to a lack of
a physical certificate representing the Book-Entry Certificates. In addition,
the Certificateholders may experience some delay in their receipt of
distributions of interest and principal on the Book-Entry Certificates, since
such distributions will be forwarded by the Trustee (or its duly appointed
paying agent, if any) to DTC, and DTC will credit such distributions to the
accounts of DTC Participants (as defined herein) which will thereafter credit
them to the accounts of Certificateholders either directly or indirectly through
indirect participants. Also, issuance of the Book-Entry Certificates in
book-entry form may reduce the liquidity thereof in any secondary trading market
that may develop therefor because investors may be unwilling to purchase
securities for which they cannot obtain delivery of physical certificates. See
"Description of the Certificates -- Book-Entry Registration" herein.
 
            THE CERTIFICATE TRUST, THE FIRST LEVEL CERTIFICATE TRUST
                             AND THE MORTGAGE TRUST
 
    The assets of the Certificate Trust will consist of the certificates (other
than the Class R-2 Certificates) issued by the First Level Certificate Trust.
The assets of the First Level Certificate Trust will consist of the certificates
(other than the Class R-1 Certificates) issued by the Mortgage Trust. The
primary assets of the Mortgage Trust will consist of a pool (the "Mortgage
Pool") of conventional fixed-rate one-to four-family residential and cooperative
apartment Mortgage Loans with original terms to maturity of not more than 30
years. The Mortgage Trust will also contain (i) certain insurance policies
related to the Mortgage Loans, (ii) any property which secured a Mortgage Loan
and which is acquired by foreclosure or by deed in lieu of foreclosure after the
Cut-Off Date, (iii) amounts held in the Certificate Account, and (iv) certain
other assets. Funds otherwise required to be held in the Certificate Account may
be held in an investment account and invested for the benefit of the Company in
Eligible Investments pursuant to the terms of the Pooling Agreement described
herein. The Mortgage Loans will be assigned to the Trustee, together with all
principal and interest due on the Mortgage Loans after the Cut-Off Date. The
Trustee will, concurrently with such assignment, authenticate and deliver the
Certificates. Each Mortgage Loan will be identified in a schedule appearing as
an exhibit to the Pooling Agreement (the "Mortgage Loan Schedule") which will
specify with respect to each Mortgage Loan, among other things, the applicable
Loan Group, the original principal balance and the outstanding principal balance
as of the close of business on the Cut-Off Date, the term of the Mortgage Note
and the Mortgage Interest Rate.
 
                                      S-39
<PAGE>
                       DESCRIPTION OF THE MORTGAGE POOL*
 
    The Mortgage Pool will consist of Mortgage Loans that will have an aggregate
principal balance outstanding as of December 1, 1996 (the "Cut-Off Date"), after
deducting payments due on or before that date, of approximately $146,707,211.
The Group I Loans and Group II Loans have an aggregate principal balance
outstanding as of December 1, 1996, after deducting payments due on or before
that date, of approximately $46,547,857 and $100,159,355, respectively. Certain
of the risks of loss on certain Mortgage Loans will be covered up to specified
limits by Primary Insurance Policies.
 
    The Mortgage Loans are secured by first mortgages or first deeds of trust or
other similar security instruments creating first liens on one- to four-family
residential or cooperative apartment properties (the "Mortgaged Properties"),
which may include detached homes, duplexes, townhouses, individual condominium
units, individual units in planned unit developments and other attached dwelling
units which are part of buildings consisting of more than four units (so long as
the property subject to the lien of the related Mortgage consists of no more
than four units other than cooperative apartments), and having the additional
characteristics described below and in the Prospectus.
 
    Each Mortgage Loan will have a first payment date during the period from
July, 1995 through January, 1997, inclusive, and will have an original term to
maturity of not more than 15 years in the case of Group I Loans and 30 years in
the case of Group II Loans.
 
    As of the Cut-Off Date, the Mortgage Interest Rate on each Mortgage Loan
will be not less than 6.500% and not more than 9.750% per annum. As of the
Cut-Off Date, the weighted average of the Mortgage Interest Rates on the
Mortgage Loans will be approximately 8.189% per annum.
 
    Each Mortgage Loan has a pass-through rate (the "Pass-Through Rate") equal
to the excess, if any, of the Mortgage Interest Rate for such Mortgage Loan over
the sum of the Servicing Fee and the Master Servicing Fee for such Mortgage
Loan. As of the Cut-Off Date, the Pass-Through Rate for each Mortgage Loan will
be not less than 6.250% and not more than 9.460% per annum. As of the Cut-Off
Date, the weighted average of the Pass-Through Rates for the Mortgage Loans will
be approximately 7.906% per annum.
 
    All of the Mortgage Loans will have principal and interest payable on the
first day of each month (the "Due Date"). None of the Mortgage Loans will be
Buydown Loans. The latest original scheduled maturity of any Mortgage Loan will
be December, 2026. Each of the Mortgage Loans will have original terms to
maturity not more than 30 years, and as of the Cut-Off Date, the weighted
average remaining term to maturity (adjusted for Curtailments) of the Mortgage
Loans will be approximately 298.7 months. At origination, based upon an
appraisal of the Mortgaged Property securing each Mortgage
 
- ------------------------
*The description herein of the Mortgage Pool and the Mortgaged Properties is
 based upon the Mortgage Loans at the close of business on the Cut-Off Date,
 after deducting the scheduled principal payments due on or before such date,
 whether or not actually received. All references herein to "principal balance"
 refer to the principal balance as of the Cut-Off Date, unless otherwise
 specifically stated or required by the context. References herein to
 percentages of Mortgage Loans refer in each case to the percentage of the
 aggregate principal balance of the related Mortgage Loans, based on the
 outstanding principal balances of the Mortgage Loans after giving effect to
 scheduled Monthly Payments due on or prior to the Cut-Off Date, whether or not
 received. References to weighted averages refer, in each case, to weighted
 averages by principal balance as of the Cut-Off Date of the related Mortgage
 Loans (determined as described in the preceding sentence). Prior to the
 issuance of the Certificates, Mortgage Loans may be removed from the Mortgage
 Pool as a result of principal prepayments in full ("Payoffs"), delinquencies or
 otherwise. In such event, other Mortgage Loans may be included in the Mortgage
 Pool. The Company believes that the information set forth herein with respect
 to the Mortgage Pool is representative of the characteristics of the Mortgage
 Pool as it will actually be constituted at the time the Certificates are
 issued, although the range of Mortgage Interest Rates and certain other
 characteristics of the Mortgage Loans in the Mortgage Pool may vary. See "--
 Additional Information" herein.
 
                                      S-40
<PAGE>
Loan, approximately 82.4% of the Mortgage Loans will have had Loan-to-Value
Ratios less than or equal to 80%, and approximately 17.6% of the Mortgage Loans
will have had Loan-to-Value Ratios greater than 80% but less than or equal to
95%. No Mortgage Loan will have had a Loan-to-Value Ratio at origination greater
than 95%. At origination, the weighted average of the Loan-to-Value Ratios of
the Mortgage Loans was approximately 75.7%. As of the Cut-Off Date, the weighted
average of the Loan-to-Value Ratios of the Mortgage Loans is approximately
74.9%. As of the Cut-Off Date, approximately 17.6% of the Mortgage Loans are
covered by a Primary Insurance Policy. All of the Mortgage Loans with
Loan-to-Value Ratios as of the Cut-Off Date in excess of 80% were covered by a
Primary Insurance Policy. At origination, each Mortgage Loan will have had a
principal balance of not less than $215,000 nor more than $1,340,625, and the
average principal balance of the Mortgage Loans as of the Cut-Off Date will be
approximately $329,679. Approximately 98.6% of the Mortgage Loans will have been
secured by owner-occupied Mortgaged Properties which were the primary residences
of the related Mortgagors, based solely on representations of the Mortgagors
obtained at the origination of the related Mortgage Loans, and approximately
1.4% of the Mortgage Loans will have been secured by owner-occupied Mortgaged
Properties which were second or vacation homes of the related Mortgagors, based
solely on such representations. None of the Mortgage Loans will have been
secured by Mortgaged Properties which were investor properties of the related
Mortgagors, based solely on such representations. Approximately 0.6% of the
Mortgage Loans are secured by interests in cooperative apartments. The aggregate
principal balance of Mortgage Loans in the Mortgage Pool originated under
reduced documentation programs (including certain Mortgage Loans for which
verification of income and deposits was not required), which generally limits
the original Loan-to-Value Ratio of the Mortgage Loan, will be approximately
$11,507,548, which will be approximately 7.8% of the Mortgage Pool. As of the
Cut-Off Date, the weighted average of the Loan-to-Value Ratios of such Mortgage
Loans originated under such reduced documentation programs is approximately
64.4%.
 
    Approximately 30.8% of the Mortgage Loans are secured by Mortgaged
Properties located in California; 6.9%, in Illinois; 6.7%, in Connecticut; 5.9%,
in New York; 5.2%, in New Jersey; and no other single state contains Mortgaged
Properties securing more than 5% of the Mortgage Loans. No more than 1.8% of the
Mortgage Loans will be secured by Mortgaged Properties located in any one
California zip code area, and no more than 1.3% of the Mortgage Loans will be
secured by Mortgaged Properties located in any other single zip code area.
Approximately 34.8% of the Mortgage Loans will have been originated for the
purpose of refinancing existing mortgage debt, including cash-out refinancings.
Approximately 65.2% of the Mortgage Loans will have been originated for the
purpose of purchasing the Mortgaged Property.
 
LOAN GROUP I
 
    As of the Cut-Off Date, the Mortgage Interest Rate on each Group I Loan will
be not less than 6.500% and not more than 9.000% per annum. As of the Cut-Off
Date, the weighted average of the Mortgage Interest Rates on the Group I Loans
will be approximately 7.609% per annum. As of the Cut-Off Date, the Pass-Through
Rate for each Group I Loan will be not less than 6.250% and not more than 8.700%
per annum. As of the Cut-Off Date, the weighted average of the Pass-Through
Rates for the Group I Loans will be approximately 7.339% per annum.
 
    All of the Group I Loans will have principal and interest payable on the
first day of each month (the "Due Date"). None of the Group I Loans will be
Buydown Loans. The latest original scheduled maturity of any Group I Loan will
be December 2011. Each of the Group I Loans will have original terms to maturity
of not more than 15 years, and as of the Cut-Off Date, the weighted average
remaining term to maturity (adjusted for Curtailments) of the Group I Loans will
be approximately 170.8 months. At origination, based upon an appraisal of the
Mortgaged Property securing each Group I Loan, approximately 92.6% of the Group
I Loans will have had Loan-to-Value Ratios less than or equal to 80%, and
approximately 7.4% of the Group I Loans will have had Loan-to-Value Ratios
greater than 80% but less than or equal to 95%. No Group I Loan will have had a
Loan-to-Value Ratio at origination greater than 95%. At origination, the
weighted average of the Loan-to-Value Ratios of the Group I Loans was
approximately 71.4%. As of the Cut-Off Date, the weighted average of the
 
                                      S-41
<PAGE>
Loan-to-Value Ratios of the Group I Loans is approximately 69.3%. As of the
Cut-Off Date, approximately 7.4% of the Group I Loans are covered by a Primary
Insurance Policy. All of the Group I Loans with Loan-to-Value Ratios as of the
Cut-Off Date in excess of 80% were covered by a Primary Insurance Policy. At
origination, each Group I Loan will have had a principal balance of not less
than $220,000 nor more than $1,340,625, and the average principal balance of the
Group I Loans as of the Cut-Off Date will be approximately $360,836. All of the
Group I Loans will have been secured by owner-occupied Mortgaged Properties
which were the primary residences of the related Mortgagors, based solely on
representations of the Mortgagors obtained at the origination of the related
Group I Loans, and none of the Group I Loans will have been secured by
owner-occupied Mortgaged Properties which were second or vacation homes of the
related Mortgagors, based solely on such representations. None of the Group I
Loans will have been secured by Mortgaged Properties which were investor
properties of the related Mortgagors, based solely on such representations. None
of the Group I Loans are secured by interests in cooperative apartments. The
aggregate principal balance of Group I Loans originated under reduced
documentation programs (including certain Group I Loans for which verification
of income and deposits was not required), which generally limits the original
Loan-to-Value Ratio of the Group I Loan, will be approximately $2,291,455, which
will be approximately 4.9% of the Loan Group I. As of the Cut-Off Date, the
weighted average of the Loan-to-Value Ratios of such Group I Loans originated
under such reduced documentation programs is approximately 57.71%.
 
    Approximately 32.7% of the Group I Loans are secured by Mortgaged Properties
located in California; 15.0%, in Connecticut; 7.5%, in Pennsylvania; 6.7%, in
Massachusetts; 5.2%, in Illinois; and no other single state contains Mortgaged
Properties securing more than 5.0% of the Group I Loans. No more than 3.3% of
the Group I Loans will be secured by Mortgaged Properties located in any one
California zip code area, and no more than 3.3% of the Group I Loans will be
secured by Mortgaged Properties located in any other single zip code area. 49.7%
of the Group I Loans will have been originated for the purpose of refinancing
existing mortgage debt, including cash-out refinancings. Approximately 50.3% of
the Group I Loans will have been originated for the purpose of purchasing the
Mortgaged Property.
 
LOAN GROUP II
 
    As of the Cut-Off Date, the Mortgage Interest Rate on each Group II Loan
will be not less than 7.125% and not more than 9.750% per annum. As of the
Cut-Off Date, the weighted average of the Mortgage Interest Rates on the Group
II Loans will be approximately 8.458% per annum. As of the Cut-Off Date, the
Pass-Through Rate for each Group II Loan will be not less than 6.825% and not
more than 9.460% per annum. As of the Cut-Off Date, the weighted average of the
Pass-Through Rates for the Group II Loans will be approximately 8.170% per
annum.
 
    All of the Group II Loans will have principal and interest payable on the
first day of each month (the "Due Date"). None of the Group II Loans will be
Buydown Loans. The latest original scheduled maturity of any Group II Loan will
be December 2026. Each of the Group II Loans will have original terms to
maturity not more than 30 years, and as of the Cut-Off Date, the weighted
average remaining term to maturity (adjusted for Curtailments) of the Group II
Loans will be approximately 358.2 months. At origination, based upon an
appraisal of the Mortgaged Property securing each Group II Loan, approximately
77.7% of the Group II Loans will have had Loan-to-Value Ratios less than or
equal to 80%, and approximately 22.3% of the Group II Loans will have had
Loan-to-Value Ratios greater than 80% but less than or equal to 95%. No Group II
Loan will have had a Loan-to-Value Ratio at origination greater than 95%. At
origination, the weighted average of the Loan-to-Value Ratios of the Group II
Loans was approximately 77.6%. As of the Cut-Off Date, the weighted average of
the Loan-to-Value Ratios of the Group II Loans is approximately 77.5%. As of the
Cut-Off Date, approximately 22.3% of the Group II Loans are covered by a Primary
Insurance Policy. All of the Group II Loans with Loan-to-Value Ratios as of the
Cut-Off Date in excess of 80% were covered by a Primary Insurance Policy. At
origination, each Group II Loan will have had a principal balance of not less
than $215,000 nor more than $918,750, and the average principal balance of the
Group II Loans as of the Cut-Off Date will be approximately $316,960.
Approximately 98.0% of the Group II Loans will have
 
                                      S-42
<PAGE>
been secured by owner-occupied Mortgaged Properties which were the primary
residences of the related Mortgagors, based solely on representations of the
Mortgagors obtained at the origination of the related Group II Loans, and
approximately 2.0% of the Group II Loans will have been secured by
owner-occupied Mortgaged Properties which were second or vacation homes of the
related Mortgagors, based solely on such representations. None of the Group II
Loans will have been secured by Mortgaged Properties which were investor
properties of the related Mortgagors, based solely on such representations.
Approximately 0.9% of the Group II Loans are secured by interests in cooperative
apartments. The aggregate principal balance of Group II Loans in the Loan Group
II originated under reduced documentation programs (including certain Group II
Loans for which verification of income and deposits was not required), which
generally limits the original Loan-to-Value Ratio of the Group II Loan, will be
approximately $9,216,093, which will be approximately 9.2% of the Loan Group II.
As of the Cut-Off Date, the weighted average of the Loan-to-Value Ratios of such
Group II Loans originated under such reduced documentation programs is
approximately 66.1%.
 
    Approximately 30.0% of the Group II Loans are secured by Mortgaged
Properties located in California; 7.6%, in Illinois; 6.8%, in New York; 6.0%, in
New Jersey; and no other single state contains Mortgaged Properties securing
more than 5% of the Group II Loans. No more than 2.7% of the Group II Loans will
be secured by Mortgaged Properties located in any one California zip code area,
and no more than 1.2% of the Group II Loans will be secured by Mortgaged
Properties located in any other single zip code area. Approximately 27.9% of the
Group II Loans will have been originated for the purpose of refinancing existing
mortgage debt, including cash-out refinancings. Approximately 72.1% of the Group
II Loans will have been originated for the purpose of purchasing the Mortgaged
Property.
 
ADDITIONAL INFORMATION
 
    A Current Report on Form 8-K relating to the Offered Certificates containing
a detailed description of the Mortgage Loans will be available to purchasers of
Offered Certificates at or before initial issuance of the Offered Certificates
and will be filed with the Securities and Exchange Commission within 15 days
after such initial issuance. The Current Report on Form 8-K will specify as of
the Cut-Off Date the aggregate principal balance of the Mortgage Loans and will
set forth in detail the following information regarding such Mortgage Loans for
each Loan Group and for the Mortgage Pool: the number of Mortgage Loans, the
range of Mortgage Interest Rates, the range of Mortgage Loan original principal
balances, the years in which initial Monthly Payments on the Mortgage Loans are
due, the weighted average remaining term to maturity of the Mortgage Loans, the
range of Loan to-Value Ratios of the Mortgage Loans as of the Cut-Off Date, the
types of Mortgaged Properties, the stated owner occupancy status of the
Mortgaged Properties at the time the Mortgage Loans were originated, the
geographic distribution by state of the Mortgage Properties, the scheduled
maturity years of the Mortgage Loans (adjusted for Curtailments), the original
terms of the Mortgage Loans, the Mortgagors' purpose of financing, the number of
Mortgage Loans originated under a reduced documentation program, if any, and the
number of Buydown Loans, if any, in each case, for each Loan Group and for the
Mortgage Pool.
 
                                      S-43
<PAGE>
                        DESCRIPTION OF THE CERTIFICATES
 
GENERAL
 
    The Certificates will be issued pursuant to a Pooling and Servicing
Agreement (the "Pooling Agreement") to be dated as of the Cut-Off Date between
the Company, as Depositor and Master Servicer, and First Bank National
Association, as trustee (the "Trustee"), a form of which is filed as an exhibit
to the Registration Statement of which this Prospectus Supplement is a part.
Reference is made to the Prospectus for important additional information
regarding the terms and conditions of the Pooling Agreement and the
Certificates. It is a condition to the issuance of the Certificates that the
Senior Certificates be rated "Aaa" by Moody's Investors Service ("Moody's") and
"AAA" by Duff & Phelps Credit Rating Co. ("DCR" and, together with Moody's, the
"Rating Agencies") and that the Class B-1 Certificates be rated not less than
"Aa2" by Moody's and "AA" by DCR, the Class B-2 Certificates be rated not less
than "A2" by Moody's and "A" by DCR and the Class B-3 Certificates be rated not
less than "Baa2" by Moody's and "BBB" by DCR. See "Certificate Ratings" herein.
At the time of their issuance, the Offered Certificates, other than the Class
B-2 and Class B-3 Certificates, will qualify as "mortgage related securities"
within the meaning of the Secondary Mortgage Market Enhancement Act of 1984.
 
    The Master Servicer will be obligated to make Advances with respect to
delinquent payments on Mortgage Loans as described herein under "-- Advances".
 
    The Certificates, other than the Class R-1 and Class R-2 Certificates, will
evidence all the beneficial ownership in a trust (the "Certificate Trust")
established by the Company, the assets of which, together with the Class R-2
Certificates described below, will evidence all the beneficial ownership
interest in another trust (the "First Level Certificate Trust"). The assets of
the First Level Trust, together with the Class R-1 Certificates, will evidence
all the beneficial ownership interest in another trust (the "Mortgage Trust"),
also established by the Company, into which the mortgage loans (the "Mortgage
Loans") will be deposited. The Mortgage Pass-Through Certificates, Series 1996-4
(the "Certificates"), will consist of the following twenty-three classes: (i)
Class IA-1, Class IA-2 and Class IA-3 (the "Class IA Certificates"), (ii) Class
IIA-1, Class IIA-2, Class IIA-3, Class IIA-4, Class IIA-5, Class IIA-6 and Class
IIA-7 (the "Class IIA Certificates" and together with the Class IA Certificates,
the "Class A Certificates"), (iii) Class IP and Class IIP (the "Class P
Certificates"), (iv) Class IX and Class IIX (the "Class X Certificates"), (v)
Class B-1, Class B-2 and Class B-3 (the "Senior Subordinate Certificates"), (vi)
Class B-4, Class B-5 and Class B-6 (the "Junior Subordinate Certificates" and
together with the Senior Subordinate Certificates, the "Subordinate
Certificates" or the "Class B Certificates") and (vii) Class R, Class R-1 and
Class R-2 (the "Residual Certificates" and together with the Class A, Class X
and Class P Certificates, the "Senior Certificates"). The Class IA, Class IP and
Class IX Certificates are sometimes referred to as the "Class I Certificates"
and the Class IIA, Class IIP and Class IIX Certificates are sometimes referred
to as the "Class II Certificates". The Class IA-3 and Class IIA-5 Certificates
are sometimes referred to as the "Lockout Certificates". The Class IIA-1 and
Class IIA-2 Certificates are sometimes referred to as the "LIBOR Certificates".
The Class IIA-1 Certificates are sometimes referred to as the "Floater
Certificates" and the Class IIA-2 Certificates are sometimes referred to as the
"Inverse Floater Certificates". Only the Senior Certificates and the Senior
Subordinate Certificates (the "Offered Certificates") are offered hereby. The
Junior Subordinate Certificates are not offered hereby. The "Class Principal
Balance" for any Class will equal the aggregate amount of principal to which
such Class is entitled, after giving effect to prior (i) distributions of
principal to such Class and (ii) allocations of losses required to be borne by
such Class.
 
    The "Certificate Principal Balance" for any Certificate will be the portion
of the corresponding Class Principal Balance represented by such Certificate.
The aggregate initial Certificate Principal Balance will be approximately equal
to the aggregate principal balance of the Mortgage Loans as of the Cut-Off Date.
The Senior Certificates will comprise approximately 96.00%, the Senior
Subordinate Certificates will comprise approximately 3.00%, and the Junior
Subordinate Certificates will comprise
 
                                      S-44
<PAGE>
approximately 1.00% of the initial aggregate Certificate Principal Balance of
the Certificates. The initial Certificate Principal Balance of the Class IA and
Class IIA Certificates comprise approximately 95.28% and 95.01%, respectively,
of the Stated Principal Balance of the Group I Loans and the Group II Loans,
respectively. The Offered Certificates, other than the Class X, Inverse Floater,
Class IIA-3, Class IIA-4 and Residual Certificates, are offered in minimum
denominations equivalent to not less than $25,000 initial Certificate Principal
Balance each and multiples of $1 in excess thereof. The Class IX, Class IIX and
Class IIA-2 Certificates are offered in minimum denominations equivalent to not
less than $100,000 initial Class Notional Amounts each and multiples of $1 in
excess thereof, except that one Class IX, Class IIX and Class IIA-2 Certificate
may be issued in a different amount. The Class IIA-3 and Class IIA-4
Certificates are offered in minimum denominations equivalent to not less than
$1,000 initial Certificate Principal Balance each and multiples of $1 in excess
thereof. The Residual Certificates, which will each have an initial Certificate
Principal Balance of $50, will each be offered in registered, certificated form
in a single denomination of a 99.99% Percentage Interest. The remaining 0.01%
Percentage Interest of each of the Class R, Class R-1 and Class R-2 Certificates
will be retained by the Company as set forth herein under "Certain Federal
Income Tax Consequences".
 
    Each Class of Book-Entry Certificates will initially be represented by a
global Certificate registered in the name of the nominee of DTC. DTC has advised
the Company that DTC's nominee will be Cede & Co. ("Cede"). Accordingly, Cede is
expected to be the holder of record of the Book-Entry Certificates. No
Book-Entry Certificateholder will be entitled to receive a certificate
representing such person's interest in such Certificate. Unless and until
Definitive Certificates (as defined below) are issued under the limited
circumstances described herein, all references herein to actions by Book-Entry
Certificateholders shall refer to actions taken by DTC upon instructions from
DTC Participants (as defined below), and all references herein to distributions,
notices, reports, and statements to Book-Entry Certificateholders shall refer to
distributions, notices, reports, and statements to Cede, as the registered
holder of such Certificates, for distribution to Book-Entry Certificateholders
in accordance with DTC procedures. See "-- Book-Entry Registration" and "--
Definitive Certificates" herein.
 
BOOK-ENTRY REGISTRATION
 
    Certificateholders may hold their Book-Entry Certificates through DTC, if
they are DTC Participants (as defined below), or indirectly through
organizations which are DTC Participants. Transfers between DTC Participants
will occur in the ordinary way in accordance with DTC rules. Cede, as nominee of
DTC,will hold the global Certificates for the Book-Entry Certificates.
 
    DTC has advised the Company that it is a limited-purpose trust company
organized under the New York Banking Law, a "banking organization" within the
meaning of the New York Banking Law, a member of the Federal Reserve System, a
"clearing corporation" within the meaning of the New York Uniform Commercial
Code and a "clearing agency" registered pursuant to the provisions of Section
17A of the Securities Exchange Act of 1934, as amended. DTC holds securities
that its participants ("DTC Participants") deposit with DTC. DTC also
facilitates the settlement among DTC Participants of securities transactions,
such as transfers and pledges, in deposited securities through electronic
computerized book-entry changes in DTC Participants' accounts, thereby
eliminating the need for physical movement of securities certificates. DTC
Participants include the Underwriter, securities brokers and dealers, banks,
trust companies, clearing corporations and certain other organizations. Indirect
access to the DTC system also is available to other entities, such as banks,
brokers, dealers, and trust companies that clear through or maintain a custodial
relationship with a DTC Participant, either directly or indirectly ("Indirect
DTC Participants").
 
    Certificateholders that are not DTC Participants or Indirect DTC
Participants but desire to purchase, sell, or otherwise transfer ownership of or
other interests in Book-Entry Certificates may do so only through DTC
Participants and Indirect DTC Participants. In addition, unless Definitive
Certificates are issued, Certificateholders will receive all distributions of
principal and interest on the Book-Entry Certificates through DTC Participants.
Under a book-entry format, Certificateholders will receive payments after the
related Distribution Date because, while payments are required to be
 
                                      S-45
<PAGE>
forwarded to Cede, as nominee for DTC, on each such date, DTC will forward such
payments to DTC Participants which thereafter will be required to forward them
to Indirect DTC Participants or Certificateholders. It is anticipated that the
sole "Certificateholder" (as such term is used in the Pooling Agreement) for
each Class of Book-Entry Certificates will be Cede, as nominee of DTC, and that
Book-Entry Certificateholders will not be recognized by the Trustee as
Certificateholders under the Pooling Agreement. Book-Entry Certificateholders
will be permitted to exercise the rights of Certificateholders under the Pooling
Agreement only indirectly through DTC Participants, who in turn will exercise
their rights through DTC.
 
    Under the rules, regulations and procedures creating and affecting DTC and
its operations (the "Rules"), DTC is required to make book-entry transfers among
DTC Participants on whose behalf it acts with respect to the Book-Entry
Certificates and is required to receive and transmit payments of principal and
interest, if any, on such Book-Entry Certificates. DTC Participants and Indirect
DTC Participants with whom Book-Entry Certificateholders have accounts with
respect to the Book-Entry Certificates similarly are required to make book-entry
transfers and receive and transmit such payments on behalf of their respective
Book-Entry Certificateholders. Accordingly, although owners of Book-Entry
Certificates will not possess Definitive Certificates, the Rules provide a
mechanism by which owners of the Book-Entry Certificates through their DTC
Participants will receive payments and will be able to transfer their interest.
 
    Because DTC can only act on behalf of DTC Participants, who in turn act on
behalf of Indirect DTC Participants and certain banks, the ability of a
Book-Entry Certificateholder to pledge Book-Entry Certificates to persons or
entities that do not participate in the DTC system, or otherwise take actions in
respect of such Book-Entry Certificates, may be limited due to the lack of a
physical certificate for such Book-Entry Certificates.
 
    DTC has advised the Company that it will take any action permitted to be
taken by a Book-Entry Certificateholder under the Pooling Agreement only at the
direction of one or more DTC Participants to whose account with DTC the
Certificates are credited. Additionally, DTC has advised the Company that it
will take such actions with respect to a Book-Entry Certificate only at the
direction of and on behalf of the DTC Participant whose holdings include that
Certificate. DTC may take conflicting actions with respect to other Book-Entry
Certificates to the extent that such actions are taken on behalf of DTC
Participants whose holdings include such Book-Entry Certificates.
 
    Although DTC has agreed to the foregoing procedures in order to facilitate
transfers of Book-Entry Certificates among DTC Participants, it is under no
obligation to perform or continue to perform such procedures and such procedures
may be discontinued at any time.
 
DEFINITIVE CERTIFICATES
 
    The Book-Entry Certificates will be issued in fully registered, certificated
form to Certificateholders or their nominees ("Definitive Certificates"), rather
than to DTC or its nominee, only if (i) the Company advises the Trustee in
writing that DTC is no longer willing or able to discharge properly its
responsibilities as Depository with respect to the Book-Entry Certificates and
the Trustee or the Company is unable to locate a qualified successor, (ii) the
Company, at its option, elects to terminate the book-entry system through DTC or
(iii) after the occurrence of an Event of Default, Certificateholders of
Book-Entry Certificates evidencing not less than 66% of the aggregate
outstanding Certificate Principal Balance advise the Trustee and DTC through DTC
Participants in writing that the continuation of a book-entry system through DTC
(or a successor thereto) is no longer in the best interests of the
Certificateholders.
 
    Upon notice of the occurrence of any of the events described in the
immediately preceding paragraph, DTC is required to notify all DTC Participants
of the availability of Definitive Certificates. Upon surrender by DTC of the
global Certificates and receipt from DTC of instructions for re-
 
                                      S-46
<PAGE>
registration, the Trustee will issue the Book-Entry Certificates in the form of
Definitive Certificates, and thereafter the Trustee will recognize the holders
of such Definitive Certificates as Certificateholders under the Pooling
Agreement.
 
    Distributions of principal and interest on the Definitive Certificates, as
well as the other Classes of Certificates, will be made by the Trustee (or its
duly appointed paying agent, if any) directly to holders of such Certificates in
accordance with the procedures set forth herein and in the Pooling Agreement.
Distributions of principal and interest on each Distribution Date will be made
to holders in whose names such Certificates were registered at the close of
business on the related Record Date. Distributions will be made by wire transfer
in immediately available funds for the account of each such holder or, if a
holder has not provided wire instructions, by check mailed to the address of
such holder as it appears on the register maintained by the Certificate
Registrar. The final payment on any Certificate (whether Class X, Class P,
Residual Certificates, Class B, Definitive Certificates or the global
Certificates registered in the name of Cede) will be made only upon presentation
and surrender of such Certificate at the offices of the Trustee or its agent or
such office or agency as is specified in the notice of final distribution to
holders of Certificates being retired. The Trustee will provide such notice to
registered Certificateholders not later than the fifteenth day of the month in
which all remaining outstanding Certificates will be retired.
 
    Definitive Certificates, as well as the other Classes of Certificates, will
be transferable and exchangeable at the offices of the Trustee in New York City.
A reasonable service charge may be imposed for any registration of transfer or
exchange, and the Trustee or such agent may require payment of a sum sufficient
to cover any tax or other governmental charge imposed in connection therewith.
 
PRIORITY OF DISTRIBUTIONS
 
    On the 25th day of each month, or if such 25th day is not a business day, on
the immediately succeeding business day (each, a "Distribution Date"), prior to
the Credit Support Depletion Date (as defined herein), distributions will be
made in the order and priority as follows:
 
    (a) with respect to the Class I Certificates and the Residual Certificates,
       to the extent of the Available Distribution Amount (as defined herein)
       for Loan Group I remaining following prior distributions, if any, on such
       Distribution Date:
 
        (i) first, to the Class IP Certificates, the Class IP Fraction (as
            defined herein) of all principal received on or in respect of each
            Class IP Mortgage Loan (as defined herein);
 
        (ii) second, to the Class I Certificates (other than the Class IP
             Certificates) and the Residual Certificates, accrued and unpaid
             interest at the respective Remittance Rates on their respective
             Class Principal Balances (or the Class IX Notional Amount, in the
             case of the Class IX Certificates);
 
       (iii) third, to the Class IA Certificates and the Residual Certificates,
             as principal, the Class IA Principal Distribution Amount in the
             order described in "-- Distributions of Principal -- CLASS IA
             PRINCIPAL DISTRIBUTION AMOUNT" herein; and
 
       (iv) fourth, for so long as the Class B Certificates are outstanding, to
            the Class IP Certificates, the sum of (a) principal in an amount
            equal to the Class IP Fraction of certain principal losses on the
            Class IP Mortgage Loans, as described in "-- Distributions of
            Principal" herein to the extent of amounts otherwise available to
            pay the Subordinate Principal Distribution Amount (as defined
            herein) (without regard to clause (B) of such definition) on such
            Distribution Date and (b) the sum of amounts, if any, by which the
            amount described in clause (a) above on each prior Distribution Date
            exceeded the amount actually distributed in respect thereof on such
            prior Distribution Dates and not subsequently distributed, to the
            extent of the Subordinate Principal Distribution
 
                                      S-47
<PAGE>
            Amount on such Distribution Date (any amounts distributed in respect
            of losses pursuant to this paragraph shall not cause a further
            reduction in the Class Principal Balance of the Class IP
            Certificates); PROVIDED, that if the amounts otherwise available to
            pay the Subordinate Principal Distribution Amount for any such
            Distribution Date are insufficient to cover such outstanding
            principal losses for the Class IP Certificates as provided above and
            Class IIP Certificates as provided in clause (iv) of paragraph (b)
            below, then the amounts otherwise available to pay the Subordinate
            Principal Distribution Amount will be allocated pro rata to the
            Class IP and Class IIP Certificates based on the amount such
            Certificates are entitled to receive pursuant to this clause, in the
            case of the Class IP Certificates, and clause (iv) of paragraph (b)
            below, in the case of the Class IIP Certificates;
 
    (b) with respect to the Class II Certificates, to the extent of the
       Available Distribution Amount for Loan Group II remaining following prior
       distributions, if any, on such Distribution Date:
 
        (i) first, to the Class IIP Certificates, the Class IIP Fraction (as
            defined herein) of all principal received on or in respect of each
            Class IIP Mortgage Loan (as defined herein);
 
        (ii) second, to the Class II Certificates (other than the Class IIP
             Certificates), accrued and unpaid interest at their respective
             Remittance Rates on their respective Class Principal Balances (or
             the Class IIX and Class IIA-2 Notional Amounts, in the case of the
             Class IIX and Class IIA-2 Certificates, respectively);
 
       (iii) third, to the Class IIA Certificates, as principal, the Class IIA
             Principal Distribution Amount in the order described in "--
             Distributions of Principal -- CLASS IIA PRINCIPAL DISTRIBUTION
             AMOUNT" herein; and
 
       (iv) fourth, for so long as the Class B Certificates are outstanding, to
            the Class IIP Certificates, the sum of (a) principal in an amount
            equal to the Class IIP Fraction of certain principal losses on the
            Class IIP Mortgage Loans, as described in "-- Distributions of
            Principal" herein to the extent of amounts otherwise available to
            pay the Subordinate Principal Distribution Amount (without regard to
            clause (B) of such definition) on such Distribution Date and (b) the
            sum of amounts, if any, by which the amount described in clause (a)
            above on each prior Distribution Date exceeded the amount actually
            distributed in respect thereof on such prior Distribution Dates and
            not subsequently distributed, to the extent of the Subordinate
            Principal Distribution Amount on such Distribution Date (any amounts
            distributed in respect of losses pursuant to this paragraph shall
            not cause a further reduction in the Class Principal Balance of the
            Class IIP Certificates); PROVIDED, that if the amounts otherwise
            available to pay the Subordinate Principal Distribution Amount for
            any such Distribution Date are insufficient to cover such
            outstanding principal losses for the Class IIP Certificates as
            provided above and Class IP Certificates as provided in clause (iv)
            of paragraph (a) above, then the amounts otherwise available to pay
            the Subordinate Principal Distribution Amount will be allocated pro
            rata to the Class IP and Class IIP Certificates based on the amount
            such Certificates are entitled to receive pursuant to this clause,
            in the case of the Class IIP Certificates, and clause (iv) of
            paragraph (a) above, in the case of the Class IP Certificates;
 
    (c) With respect to the Class B Certificates and the Residual Certificates,
       subject to the payment of the Senior Certificates as described above, and
       to the extent of the Available Distribution Amount for both Loan Groups
       remaining, if any, following prior distributions on such Distribution
       Date:
 
        (i) first, to the Class B-1 Certificates, accrued and unpaid interest at
            the Class B-1 Remittance Rate on the Class B-1 Principal Balance;
 
                                      S-48
<PAGE>
        (ii) second, to the Class B-1 Certificates, their pro rata share of the
             Subordinate Principal Distribution Amount;
 
       (iii) third, to the Class B-2 Certificates, accrued and unpaid interest
             at the Class B-2 Remittance Rate on the Class B-2 Principal
             Balance;
 
       (iv) fourth, to the Class B-2 Certificates, their pro rata share of the
            Subordinate Principal Distribution Amount;
 
        (v) fifth, to the Class B-3 Certificates, accrued and unpaid interest at
            the Class B-3 Remittance Rate on the Class B-3 Principal Balance;
 
       (vi) sixth, to the Class B-3 Certificates, their pro rata share of the
            Subordinate Principal Distribution Amount;
 
       (vii) seventh, to the Junior Subordinate Certificates, interest and
             principal in the same manner as for the Senior Subordinate
             Certificates, first to the Class B-4 Certificates, then to the
             Class B-5 Certificates and then to the Class B-6 Certificates;
 
      (viii) eighth, to each Class of the Subordinate Certificates in the order
             of seniority, the remaining portion, if any, of the Available
             Distribution Amount, up to the amount of unreimbursed realized
             losses previously allocated to such Class, if any, provided
             distribution of any amount pursuant to this paragraph shall not
             cause a further reduction in the Class Principal Balances of the
             Subordinated Certificates; and
 
       (ix) ninth, to the Residual Certificates, the remaining portion, if any,
            of the Available Distribution Amount for such Distribution Date, as
            their respective interests are described in the Pooling Agreement.
 
    With respect to the Class B Certificates, notwithstanding the foregoing, on
any Distribution Date on which the Subordination Level for any Class of Class B
Certificates is less than such percentage as of the Cut-Off Date, the portion of
the Subordinate Principal Distribution Amount otherwise allocable to the Class
or Classes junior to such Class will be allocated to the most senior Class of
Class B Certificates for which the Subordination Level is less than such
percentage as of the Cut-Off Date and to the Class or Classes of Class B
Certificates senior thereto, pro rata according to the Class Principal Balances
of such Classes. The "Subordination Level" on any specified date with respect to
any Class of Class B Certificates is the percentage obtained by dividing the sum
of the Class Principal Balances of all Classes of Certificates which are
subordinate in right of payment to such Class by the sum of the Class Principal
Balances of all of the Certificates as of such date prior to giving effect to
distributions or allocations of realized losses on the Mortgage Loans on such
date.
 
    On each Distribution Date on or after the Credit Support Depletion Date,
distributions will be made in the order and priority as follows:
 
    (a) With respect to the Class I Certificates and the Residual Certificates,
       subject, in each case, to the extent of the Available Distribution Amount
       of Loan Group I remaining following prior distributions, if any, on such
       Distribution Date:
 
        (i) first, to the Class IP Certificates, the Class IP Fraction of all
            principal received on or in respect of each Class IP Mortgage Loan;
 
        (ii) second, to the Class I Certificates (other than the Class IP
             Certificates) and the Residual Certificates, accrued and unpaid
             interest at their respective Remittance Rates on their respective
             Class Principal Balances (or the Class IX Notional Amount, in the
             case of the Class IX Certificates);
 
       (iii) third, to the Class IA Certificates and the Residual Certificates,
             the Class IA Principal Distribution Amount, pro rata according to
             their respective Class Principal Balances; and
 
                                      S-49
<PAGE>
       (iv) fourth, to the Residual Certificates, the remaining portion, if any,
            of the Available Distribution Amount for Loan Group I for such
            Distribution Date, as their respective interests are described in
            the Pooling Agreement;
 
    (b) with respect to the Class II Certificates and the Residual Certificates,
       subject, in each case, to the extent of the Available Distribution Amount
       of Loan Group II remaining following prior distributions, if any, on such
       Distribution Date:
 
        (i) first, to the Class IIP Certificates, the Class IIP Fraction of all
            principal received on or in respect of each Class IIP Mortgage Loan;
 
        (ii) second, to the Class II Certificates (other than the Class IIP
             Certificates), accrued and unpaid interest at their respective
             Remittance Rates on their respective Class Principal Balances (or
             the Class IIX and Class IIA-2 Notional Amount, in the case of the
             Class IIX and Class IIA-2 Certificates, respectively);
 
       (iii) third, to the Class IIA Certificates (other than the Class IIA-2
             Certificates), the Class IIA Principal Distribution Amount, pro
             rata according to their respective Class Principal Balances; and
 
       (iv) fourth, to the Residual Certificates, the remaining portion, if any,
            of the Available Distribution Amount for such Loan Group II for such
            Distribution Date, as their respective interests are described in
            the Pooling Agreement.
 
    The "Credit Support Depletion Date" is the first Distribution Date on which
the aggregate of the Class Principal Balances of the Class B Certificates has
been or will be reduced to zero.
 
    Except for the limited circumstances described herein, distributions of
interest and principal to the Class I Certificates and the Class II Certificates
will be based solely on payments received with respect to Group I Loans and
Group II Loans, respectively.
 
DISTRIBUTIONS OF INTEREST
 
    With respect to each Class of Certificates (except the Class P Certificates,
which are not entitled to interest), interest will be passed through monthly on
each Distribution Date, commencing in January 1997. With respect to each
Distribution Date, an amount of interest will accrue on each Class of
Certificates (other than the Class P Certificates) generally equal to 1/12th of
the applicable Remittance Rate for such Class multiplied by the related Class
Principal Balance or Class Notional Amount, as applicable. Interest will not
accrue on the Class P Certificates. Interest to be distributed on the
Certificates on any Distribution Date will consist of accrued and unpaid
interest as of previous Distribution Dates and interest accrued during the
preceding calendar month, except for the LIBOR Certificates which accrue
interest as described below. All distributions of interest for each Class of
Certificates will generally be made only to the extent of the Available
Distribution Amount for the related Loan Group as described herein under "--
Priority of Distributions".
 
    The Remittance Rates for the Class A (other than the LIBOR Certificates),
Class X and Residual Certificates are fixed as set forth on the cover page
hereof. The Class X Certificates will accrue interest on the applicable Class X
Notional Amount. The "Class IX Notional Amount" with respect to any Distribution
Date will equal the product of (x) the aggregate Stated 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 15-Year Premium Rate
Mortgage Loans and (y) a fraction, the numerator of which is the weighted
average of the Stripped Interest Rates (as defined herein) for the 15-Year
Premium Rate Mortgage Loans and the denominator of which is 7.000% The Class IX
Notional Amount as of the Cut-Off Date will be approximately $2,589,942. The
"Stripped Interest Rate" for each Mortgage Loan in Loan Group I is the excess,
if any, of the Pass-Through Rate for such Mortgage Loan over 7.000%.
 
                                      S-50
<PAGE>
    The "Pass-Through Rate" for each Mortgage Loan is equal to the Mortgage
Interest Rate thereon less the sum of the related Master Servicing Fee and
Servicing Fee (each, as defined herein).
 
    The "Class IIX Notional Amount" with respect to any Distribution Date will
equal the product of (x) the aggregate Stated 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 30-Year Premium Rate
Mortgage Loans and (y) a fraction, the numerator of which is the weighted
average of the Stripped Interest Rates (as defined herein) for the 30-Year
Premium Rate Mortgage Loans and the denominator of which is 8.000%. The Class
IIX Notional Amount as of the Cut-Off Date will be approximately $3,122,756. The
"Stripped Interest Rate" for each Mortgage Loan in Loan Group II is the excess,
if any, of the Pass-Through Rate for such Mortgage Loan over 8.000%.
 
    The initial Remittance Rate for the Class IIA-1 Certificates will be 6.125%
per annum. Thereafter, the Class IIA-1 Certificates will accrue interest at a
per annum rate equal to LIBOR (as defined herein) plus 0.750%, subject to a
minimum and maximum Remittance Rate of 0.750% and 9.000% per annum,
respectively. The initial Remittance Rate for the Class IIA-2 Certificates will
be 2.875% per annum. Thereafter, the Class IIA-2 Certificates will accrue
interest at a per annum rate equal to 8.250% minus LIBOR, subject to a minimum
and maximum Remittance Rate of 0.000% and 8.250% per annum, respectively. The
Class IIA-2 Certificates will accrue interest on the Class IIA-2 Notional
Amount, which will equal the Class IIA-1 Principal Balance at the time of
determination. The Class X and Class IIA-2 Certificates are not entitled to
receive distributions of principal.
 
    The Remittance Rate on the Class B-1, Class B-2 and Class B-3 Certificates
will equal, on any Distribution Date, the quotient expressed as a percentage of
(a) the sum of (i) the product of (x) 7.000% and (y) the excess, if any, of the
aggregate Stated Principal Balance of the Group I Loans, 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, and after giving effect to any
Principal Prepayments distributed on the prior Distribution Date, over the then
outstanding aggregate Class Principal Balance of the Class I Certificates (such
excess being referred to as the "Group I Subordinate Amount") and (ii) the
product of (x) 8.000% and (y) the excess, if any, of the aggregate Stated
Principal Balance of the Group II Loans, 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, and after giving effect to any Principal Prepayments
distributed on the prior Distribution Date, over the then outstanding aggregate
Class Principal Balance of the Class II Certificates (such excess being referred
to as the "Group II Subordinate Amount") over (b) the sum of the Group I
Subordinate Amount and the Group II Subordinate Amount. The initial Remittance
Rate for each Class of the Class B Certificates will be approximately 7.683% per
annum.
 
    Subject to the limitations described in this Prospectus Supplement under
"Yield and Prepayment Considerations", on each Distribution Date the Master
Servicer is obligated to pass through an amount equal to the lesser of (a) any
shortfall for the related month in interest collections resulting from the
timing of Payoffs made from the 15th day of the calendar month preceding such
Distribution Date to the last day of such month, and (b) the monthly Master
Servicing Fee, any reinvestment income realized by the Master Servicer relating
to Payoffs made from the 15th day of the calendar month preceding such
Distribution Date to the 14th day of the month of such Distribution Date and
interest payments on Payoffs received during the period of the first day through
the 14th day of the month of such Distribution Date. The amount so passed
through will hereinafter be referred to as "Compensating Interest". Compensating
Interest will be allocated to each Class of Certificates pro rata according to
the amount of interest accrued thereon, and any remaining shortfall in interest
collections resulting from the timing of Payoffs will be applied pro rata
according to the amount of interest to which each Class of Certificates would
otherwise be entitled in reduction thereof. See "Yield and Prepayment
Considerations" herein and "Yield Considerations -- Effective Interest Rate" in
the Prospectus.
 
                                      S-51
<PAGE>
LIBOR
 
    The LIBOR Certificates will bear interest at their respective Remittance
Rates, which are based on the London Interbank Offered Rate for one-month U.S.
dollar deposits ("LIBOR") determined by the Master Servicer on the basis of
quotations provided by the reference banks meeting the criteria set forth herein
(the "Reference Banks"). The initial Reference Banks will be Barclays Bank PLC,
Bankers Trust Company and The Bank of Tokyo, Ltd. The Master Servicer will
determine LIBOR and the Remittance Rates for the LIBOR Certificates for a given
accrual period, other than the initial accrual period, on the second business
day prior to the day on which such accrual period commences (a "LIBOR
Determination Date"). For this purpose a "business day" is any day on which
banks in London and New York City are open for the transaction of international
business. The Remittance Rates for the LIBOR Certificates, and the outstanding
Class Principal Balance or Class Notional Amount, as applicable, for each Class
of LIBOR Certificates (expressed as a percentage of the initial Class Principal
Balance and as a percentage of the initial Class Notional Amount, as applicable)
applicable to the then current and the immediately preceding accrual period will
appear on Telerate. The specific Telerate page number upon which such
information appears may be obtained from the Master Servicer.
 
    With respect to any accrual period commencing on or after January 25, 1997,
the determination of LIBOR will be made in accordance with the following
provisions:
 
        (i) On each LIBOR Determination Date, the Master Servicer will determine
    LIBOR on the basis of LIBOR quotations provided by each of the Reference
    Banks as of approximately 11:00 a.m. (London time) on the LIBOR
    Determination Date in question, as such quotations appear on the Telerate
    Page 3750 (each as defined in the International Swap Dealers Association
    Inc. Code of 1987 Interest Rate and Currency Exchange Definitions).
 
        (ii) If, on any LIBOR Determination Date, at least two of the Reference
    Banks provide quotations, LIBOR will be determined as the arithmetic mean
    (rounded upward, if necessary, to the nearest multiple of 1/16 of 1%) of
    such offered quotations.
 
       (iii) If, on any LIBOR Determination Date, only one or none of the
    Reference Banks provides quotations, LIBOR will be the higher of:
 
           (a) LIBOR as determined on the previous LIBOR Determination Date (or,
       in the case of the first LIBOR Determination Date, 5.375%); or
 
           (b) the Reserve Rate. The Reserve Rate will be the rate per annum
       (rounded upward, if necessary, to the nearest multiple of 1/16 of 1%)
       that the Master Servicer determines to be either (1) the arithmetic mean
       of the offered quotations that the leading banks in New York City
       selected by the Master Servicer are quoting on the relevant LIBOR
       Determination Date for one-month United States dollar deposits to the
       principal London office of each of the Reference Banks or those of them
       (being at least two in number) to which such offered quotations are, in
       the opinion of the Master Servicer, being so made, or (2) in the event
       that the Master Servicer can determine no such arithmetic mean, the
       arithmetic mean of the offered quotations that leading banks in New York
       City selected by the Master Servicer are quoting on such LIBOR
       Determination Date to leading European banks for one-month United States
       dollar deposits; provided, however, that if the banks selected by the
       Master Servicer are not quoting as mentioned above, LIBOR for the next
       accrual period will be LIBOR as specified in (a) above.
 
    Each Reference Bank (i) shall be a leading bank engaged in transactions in
Eurodollar deposits in the international Eurocurrency market, (ii) shall not
control, be controlled by, or be under common control with, the Master Servicer
and (iii) shall have an established place of business in London. If any such
Reference Bank should be unwilling or unable to act as such or if the Master
Servicer should terminate the designation of any such Reference Bank, the Master
Servicer will promptly designate another leading bank meeting the criteria
specified above.
 
                                      S-52
<PAGE>
    The establishment of LIBOR on each LIBOR Determination Date by the Master
Servicer and the Master Servicer's calculation of the Remittance Rate for the
LIBOR Certificates for the related accrual period shall, in the absence of
manifest error, be final and binding.
 
    Listed below are some historical values of LIBOR since January 1991. Such
values were not determined in accordance with the provisions set forth above and
are intended only to provide a historical summary of the movement in yields on
LIBOR; the monthly figures set forth below are the value of LIBOR as derived
from various sources.
 
<TABLE>
<CAPTION>
                                                                      YEAR
                            ----------------------------------------------------------------------------------------
MONTH                           1996           1995           1994           1993           1992           1991
- --------------------------  -------------  -------------  -------------  -------------  -------------  -------------
<S>                         <C>            <C>            <C>            <C>            <C>            <C>
January...................      5.43750%       6.09375%       3.12500%       3.18750%       4.18750%       7.06000%
February..................      5.31250        6.12500        3.56250        3.18750        4.25000        7.00000
March.....................      5.43750        6.12500        3.68750        3.18750        4.25000        6.38000
April.....................      5.43750        6.06250        4.00000        3.12500        3.93750        6.00000
May.......................      5.43750        6.06250        4.37500        3.25000        4.00000        6.00000
June......................      5.49609        6.12500        4.56250        3.18750        3.93750        6.12500
July......................      5.46484        5.87500        4.50000        3.18750        3.37500        5.93750
August....................      5.43750        5.87500        4.87500        3.18750        3.50000        5.68750
September.................      5.43359        5.87500        5.06250        3.18750        3.12500        5.43750
October...................      5.37500        5.83203        5.06250        3.18750        3.25000        5.18750
November..................      5.56250        5.97656        6.06250        3.56250        4.25000        4.75000
December..................                     5.68750        6.00000        3.25000        3.31250        4.68750
</TABLE>
 
DISTRIBUTIONS OF PRINCIPAL
 
    GENERAL.  On each Distribution Date, Certificateholders will be entitled to
receive principal distributions from the Available Distribution Amount to the
extent and priority described herein. See "-- Priority of Distributions" and "--
Distributions of Principal" herein. Except for limited circumstances described
herein, the Class I Certificates (other than the Class IX Certificates which
will not receive principal) will receive principal collected from Group I Loans
and the Class II Certificates (other than the Class IIX and Class IIA-2
Certificates which will not receive principal) will receive principal collected
from Group II Loans. The Class B Certificates will receive principal collected
from Mortgage Loans in both Loan Groups.
 
    The Class IIA-2 and Class X Certificates will not receive any distributions
of principal.
 
    CLASS IP PRINCIPAL DISTRIBUTION AMOUNT.  On each Distribution Date, the
Class IP Certificates will receive a portion of the Available Distribution
Amount for Loan Group I attributable to principal received on or in respect of
any Group I Loan with a Pass-Through Rate of less than 7.000% (a "Class IP
Mortgage Loan"), equal to the amount of such principal so attributable
multiplied by a fraction, the numerator of which is 7.000% minus the
Pass-Through Rate on such Class IP Mortgage Loan and the denominator of which is
7.000% (the "Class IP Fraction"). In addition, on each Distribution Date for so
long as any Class of Class B Certificates remains outstanding, the Class IP
Certificates will also be allocated principal, to the extent of amounts
available to pay the Subordinate Principal Distribution Amount (without regard
to clause (B) of such definition) on such Distribution Date, in an amount
generally equal to the Class IP Fraction of any loss on a Class IP Mortgage Loan
other than a Special Hazard Loss in excess of the Special Hazard Coverage, a
Fraud Loss in excess of the Fraud Coverage or a Bankruptcy Loss in excess of the
Bankruptcy Coverage (each, as defined herein), such payments in respect of
losses shall not cause a further reduction of the outstanding Class Principal
Balance of the Class IP Certificates; PROVIDED, that if the amounts otherwise
available to pay the Subordinate Principal Distribution Amount for any such
Distribution Date are insufficient to cover such outstanding principal losses
for the Class IP Certificates as provided above and Class IIP Certificates as
provided below, then the amounts otherwise available to pay the Subordinate
Principal Distribution Amount will be allocated pro rata to the Class IP and
Class IIP Certificates based on the amount such Certificates are entitled to
receive pursuant to this sentence, in the case of the Class IP
 
                                      S-53
<PAGE>
Certificates, and the second sentence under "Class IIP Principal Distribution
Amount" below, in the case of the Class IIP Certificates. The aggregate of the
amounts payable to the Class IP Certificates described in this paragraph are
referred to herein as the "Class IP Principal Distribution Amount".
 
    CLASS IA PRINCIPAL DISTRIBUTION AMOUNT.  On each Distribution Date prior to
the Credit Support Depletion Date, an amount, up to the amount of the Class IA
Principal Distribution Amount (as defined below) for such Distribution Date,
will be distributed as principal to the following Classes of Class IA
Certificates and Residual Certificates in the following order of priority:
 
    (i) first, to the Class IA-3 Certificates, an amount, up to the amount of
        the Class IA-3 Principal Distribution Amount (as defined below) for such
        Distribution Date, until the Class Principal Balance of the Class IA-3
        Certificates has been reduced to zero;
 
    (ii) second, to the Residual Certificates, until the Class Principal
         Balances of the Residual Certificates have been reduced to zero;
 
   (iii) third, to the Class IA-1 Certificates, until the Class Principal
         Balance of the Class IA-1 Certificates has been reduced to zero;
 
   (iv) fourth, to the Class IA-2 Certificates, until the Class Principal
        Balance of the Class IA-2 Certificates has been reduced to zero; and
 
    (v) fifth, to the Class IA-3 Certificates, until the Class Principal Balance
        of the Class IA-3 Certificates has been reduced to zero.
 
    The "Class IA Principal Distribution Amount" for any Distribution Date will
equal the sum of (i) the Class IA Percentage (as defined below) of the Principal
Payment Amount (as defined below) for Loan Group I (exclusive of the portion
thereof attributable to the Class IP Principal Distribution Amount), (ii) the
Class IA Prepayment Percentage (as defined below) of the Principal Prepayment
Amount (as defined below) for Loan Group I (exclusive of the portion thereof
attributable to the Class IP Principal Distribution Amount), and (iii) the Class
IA Liquidation Amount (as defined below).
 
    The "Class IA Liquidation Amount" is the aggregate of, for each Group I Loan
which became a Liquidated Mortgage Loan during the calendar month preceding the
month of the Distribution Date, the lesser of (i) the Class IA Percentage of the
principal balance of such Mortgage Loan (exclusive of the Class IP Fraction
thereof, with respect to any Class IP Mortgage Loan) and (ii) the Class IA
Prepayment Percentage of the Liquidation Principal with respect to such Mortgage
Loan.
 
    "Liquidation Principal" is the principal portion of Liquidation Proceeds
received with respect to each Mortgage Loan which became a Liquidated Mortgage
Loan (as defined herein) (but not in excess of the principal balance thereof)
during the calendar month preceding the month of the Distribution Date,
exclusive of the portion thereof attributable to the applicable Class P
Principal Distribution Amount. A "Liquidated Mortgage Loan" is a Mortgage Loan
as to which the Master Servicer or a servicer has determined 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.
 
    The "Class IA Percentage" for any Distribution Date will equal the lesser of
(a) 100% and (b) the sum of the Class Principal Balances of the Class IA
Certificates and the Residual Certificates divided by the aggregate Stated
Principal Balance of the Mortgage Loans in Loan Group I (less the Class IP
Principal Balance), in each case immediately prior to the Distribution Date.
 
    The "Stated Principal Balance" of any Mortgage Loan as of any date of
determination is equal to the principal balance thereof as of 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 allocable
 
                                      S-54
<PAGE>
to principal that have been distributed to Certificateholders with respect to
such Mortgage Loan on or before such date, and as further reduced to the extent
that any realized loss thereon has been allocated to one or more Classes of
Certificates on or before the date of determination.
 
    The "Class IA-3 Principal Distribution Amount" for any Distribution Date
will equal the sum of (i) the Class IA-3 Percentage (as defined below) of the
Principal Payment Amount for Loan Group I (exclusive of the portion thereof
attributable to the Class IP Principal Distribution Amount), (ii) the Class IA-3
Prepayment Percentage (as defined herein) of the Principal Prepayment Amount for
Loan Group I (exclusive of the portion thereof attributable to the Class IP
Principal Distribution Amount) and (iii) the Class IA-3 Liquidation Amount (as
defined below).
 
    The "Class IA-3 Percentage" for any Distribution Date will equal the lesser
of (a) 100% and (b) the Class IA-3 Principal Balance divided by the aggregate
Stated Principal Balance of the Mortgage Loans in Loan Group I (less the Class
IP Principal Balance), in each case immediately prior to the Distribution Date.
 
    The "Class IA-3 Liquidation Amount" is the aggregate of, for each Group I
Loan which became a Liquidated Mortgage Loan during the calendar month preceding
the month of the Distribution Date, the lesser of (i) the Class IA-3 Percentage
of the principal balance of such Mortgage Loan (exclusive of the Class IP
Fraction thereof, if applicable) and (ii) the Class IA-3 Percentage on any
Distribution Date occurring prior to the fifth anniversary of the first
Distribution Date, and the Class IA-3 Prepayment Percentage (as defined herein)
on any Distribution Date thereafter, in each case, of the Liquidation Principal
with respect to such Mortgage Loan.
 
    CLASS IIP PRINCIPAL DISTRIBUTION AMOUNT.  On each Distribution Date, the
Class IIP Certificates will receive a portion of the Available Distribution
Amount for Loan Group II attributable to principal received on or in respect of
any Group II Loan with a Pass-Through Rate of less than 8.000% (a "Class IIP
Mortgage Loan"), equal to the amount of such principal so attributable
multiplied by a fraction, the numerator of which is 8.000% minus the
Pass-Through Rate on such Class IIP Mortgage Loan and the denominator of which
is 8.000% (the "Class IIP Fraction"). In addition, on each Distribution Date for
so long as any Class of Class B Certificates remains outstanding, the Class IIP
Certificates will also be allocated principal, to the extent of amounts
available to pay the Subordinate Principal Distribution Amount (without regard
to clause (B) of such definition) on such Distribution Date, in an amount
generally equal to the Class IIP Fraction of any loss on a Class IIP Mortgage
Loan other than a Special Hazard Loss in excess of the Special Hazard Coverage,
a Fraud Loss in excess of the Fraud Coverage or a Bankruptcy Loss in excess of
the Bankruptcy Coverage (each, as defined herein), such payments in respect of
losses shall not cause a further reduction of the outstanding Class Principal
Balance of the Class IIP Certificates; PROVIDED, that if the amounts otherwise
available to pay the Subordinate Principal Distribution Amount for any such
Distribution Date are insufficient to cover such outstanding principal losses
for the Class IIP Certificates as provided above and Class IP Certificates as
provided above, then the amounts otherwise available to pay the Subordinate
Principal Distribution Amount will be allocated pro rata to the Class IP and
Class IIP Certificates based on the amount such Certificates are entitled to
receive pursuant to this sentence, in the case of the Class IIP Certificates,
and the second sentence of the "Class IP Principal Distribution Amount" above,
in the case of the Class IP Certificates. The aggregate of the amounts payable
to the Class IIP Certificates described in this paragraph are referred to herein
as the "Class IIP Principal Distribution Amount".
 
                                      S-55
<PAGE>
    CLASS IIA PRINCIPAL DISTRIBUTION AMOUNT.  On each Distribution Date prior to
the Credit Support Depletion Date, an amount, up to the amount of the Class IIA
Principal Distribution Amount (as defined below) for such Distribution Date,
will be distributed as principal to the following Classes of Class IIA
Certificates in the following order of priority:
 
    (i) first, to the Class IIA-5 Certificates, an amount, up to the amount of
        the Class IIA-5 Principal Distribution Amount (as defined below) for
        such Distribution Date, until the Class IIA-5 Principal Balance has been
        reduced to zero;
 
    (ii) second, concurrently, 33.3333328439%, 33.3333343122% and 33.3333328439%
         of the Class IIA Principal Distribution Amount remaining after
         distributions in clause (i) above, to the Class IIA-6, Class IIA-1 and
         Class IIA-7 Certificates, respectively, until the Class Principal
         Balances of the Class IIA-6 and Class IIA-7 Certificates have been
         reduced to zero;
 
   (iii) third, concurrently, 20.0000000000% and 80.0000000000% of the Class IIA
         Principal Distribution Amount remaining after the distributions in
         clauses (i) and (ii) above to the Class IIA-1 and Class IIA-3
         Certificates, respectively, until the Class IIA-1 Principal Balance and
         the Class IIA-3 Principal Balance have been reduced to zero;
 
   (iv) fourth, to the Class IIA-4 Certificates, all of the Class IIA Principal
        Distribution Amount remaining after the distributions in clauses (i),
        (ii) and (iii) above, until the Class IIA-4 Principal Balance has been
        reduced to zero; and
 
    (v) fifth, to the Class IIA-5 Certificates, all of the Class IIA Principal
        Distribution Amount remaining after the distributions in clauses (i),
        (ii), (iii) and (iv) above, until the Class IIA-5 Principal Balance has
        been reduced to zero.
 
    The "Class IIA Principal Distribution Amount" for any Distribution Date will
equal the sum of (i) the Class IIA Percentage (as defined below) of the
Principal Payment Amount for Loan Group II (exclusive of the portion thereof
attributable to the Class IIP Principal Distribution Amount), (ii) the Class IIA
Prepayment Percentage (as defined below) of the Principal Prepayment Amount for
Loan Group II (exclusive of the portion thereof attributable to the Class IIP
Principal Distribution Amount), and (iii) the Class IIA Liquidation Amount (as
defined below).
 
    The "Class IIA Liquidation Amount" is the aggregate of, for each Group II
Loan which became a Liquidated Mortgage Loan during the calendar month preceding
the month of the Distribution Date, the lesser of (i) the Class IIA Percentage
of the principal balance of such Mortgage Loan (exclusive of the Class IIP
Fraction thereof, with respect to any Class IIP Mortgage Loan) and (ii) the
Class IIA Prepayment Percentage of the Liquidation Principal with respect to
such Mortgage Loan.
 
    The "Class IIA Percentage" for any Distribution Date will equal the lesser
of (a) 100% and (b) the sum of the Class Principal Balances of the Class IIA
Certificates divided by the aggregate Stated Principal Balance of the Mortgage
Loans in Loan Group II (less the Class IIP Principal Balance), in each case
immediately prior to the Distribution Date.
 
    The "Class IIA-5 Principal Distribution Amount" for any Distribution Date
will equal the sum of (i) the Class IIA-5 Adjusted Percentage (as defined below)
of the Principal Payment Amount for Loan Group II (exclusive of the portion
thereof attributable to the Class IIP Principal Distribution Amount), (ii) the
Class IIA-5 Prepayment Percentage (as defined herein) of the Principal
Prepayment Amount for Loan Group II (exclusive of the portion thereof
attributable to the Class IIP Principal Distribution Amount) and (iii) the Class
IIA-5 Liquidation Amount (as defined below).
 
    The "Class IIA-5 Adjusted Percentage" for any Distribution Date shall equal
the product of the Class IIA-5 Percentage and the Lockout Percentage. The
"Lockout Percentage" shall equal 0% for any Distribution Date occurring prior to
the Distribution Date in January, 2002 and 100% for any Distribution Date
occurring on or after the Distribution Date in January, 2002. The "Class IIA-5
Percentage" for any Distribution Date will equal the lesser of (a) 100% and (b)
the Class IIA-5
 
                                      S-56
<PAGE>
Principal Balance divided by the aggregate Stated Principal Balance of the
Mortgage Loans in Loan Group II (less the Class IIP Principal Balance), in each
case immediately prior to the Distribution Date.
 
    The "Class IIA-5 Liquidation Amount" is the aggregate of, for each Group II
Loan which became a Liquidated Mortgage Loan during the calendar month preceding
the month of the Distribution Date, the lesser of (i) the Class IIA-5 Percentage
of the principal balance of such Mortgage Loan (exclusive of the Class IIP
Fraction thereof, if applicable) and (ii) the Class IIA-5 Percentage on any
Distribution Date occurring prior to the fifth anniversary of the first
Distribution Date, and the Class IIA-5 Prepayment Percentage (as defined herein)
on any Distribution Date thereafter, in each case, of the Liquidation Principal
with respect to such Mortgage Loan.
 
    For any Distribution Date and for any Loan Group, the "Principal Payment
Amount" is the sum of (i) scheduled principal payments on the Mortgage Loans in
such Loan Group due on the related Due Date, (ii) the principal portion of
repurchase proceeds received with respect to any Mortgage Loan in such Loan
Group which was repurchased as permitted or required by the Pooling Agreement
during the calendar month preceding the month of the Distribution Date and (iii)
any other unscheduled payments of principal which were received from the
Mortgage Loans in such Loan Group during the preceding calendar month, other
than Payoffs, Curtailments or Liquidation Principal. For any Distribution Date
and for any Loan Group, the "Principal Prepayment Amount" is the sum of (i) all
Curtailments from the Mortgage Loans in such Loan Group which were received
during the preceding calendar month and (ii) all Payoffs from the Mortgage Loans
in such Loan Group received from the 15th day of the month immediately prior to
the month of such Distribution Date through the 14th day of the month of such
Distribution Date (except for Payoffs received from the Cut-Off Date through
December 14, 1996, which will be passed through to holders of Certificates on
the January 1997 Distribution Date). Except as described herein, principal
distributions to the Class I Certificates will be based on the Principal Payment
Amount, Principal Prepayment Amount and Liquidation Principal for the Group I
Loans and principal distributions to the Class II Certificates will be based on
the Principal Payment Amount, Principal Prepayment Amount and Liquidation
Principal for the Group II Loans. Principal distributions to the Class B
Certificates will be based on the Principal Payment Amount, Principal Prepayment
Amount and Liquidation Principal for both Loan Groups.
 
    The "Class IA Prepayment Percentage" and "Class IIA Prepayment Percentage"
for any Distribution Date occurring during the five years beginning on the first
Distribution Date will equal 100%. The "Class IA Prepayment Percentage" and
"Class IIA Prepayment Percentage" in each of the months of the fifth through
ninth anniversaries of the first Distribution Date will be as follows: for any
Distribution Date occurring 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 Class IA or Class IIA Percentage, as
the case may be, for such Distribution Date plus 70% of the Subordinate
Percentage for the related Loan Group for such Distribution Date; 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, the Class IA or Class IIA Percentage, as the case
may be, for such Distribution Date plus 60% of the Subordinate Percentage for
the related Loan Group for such Distribution Date; 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, the Class IA or Class IIA Percentage, as the case may be, for
such Distribution Date plus 40% of the Subordinate Percentage for the related
Loan Group for such Distribution Date; 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, the
Class IA or Class IIA Percentage, as the case may be, for such Distribution Date
plus 20% of the Subordinate Percentage for the related Loan Group for such
Distribution Date. For any Distribution Date in or after the ninth anniversary
of the month of the first Distribution Date, the Class IA or Class IIA
Prepayment Percentage will be the Class IA or Class IIA Percentage, as the case
 
                                      S-57
<PAGE>
may be, for such Distribution Date. Any scheduled reduction to the Class IA and
Class IIA Prepayment Percentage described above shall not be made as of any
Distribution Date unless for both Loan Groups both (i)(X) the average
outstanding principal balance of the Mortgage Loans in the related Loan Group
delinquent 60 days or more over the last six months, as a percentage of the
related Class B Loan Group Component Balance, is less than 50% or (Y) the
average outstanding principal balance of the Mortgage Loans in the related Loan
Group delinquent 60 days or more over the last six months, as a percentage of
the aggregate average outstanding principal balance of all Mortgage Loans in
such Loan Group over the last six months, does not exceed 2% and (ii) realized
losses on the Mortgage Loans in the related Loan Group to date for such
Distribution Date, if occurring during the sixth, seventh, eighth, ninth or
tenth year (or any year thereafter) after the first Distribution Date, are less
than 30%, 35%, 40%, 45% or 50%, respectively, of the initial related Class B
Loan Group Component Balance. The "Class B Loan Group Component Balance" at any
time shall equal for any Loan Group the then outstanding aggregate Stated
Principal Balance of the Mortgage Loans in the applicable Loan Group minus the
then outstanding Class Principal Balance of the Class I and Residual
Certificates for Loan Group I or Class II Certificates for Loan Group II. Upon
reduction of the Class I Principal Balance (other than the Class IP Principal
Balance) and the aggregate Class Principal Balance of the Residual Certificates,
or the Class II Principal Balance (other than the Class IIP Principal Balance),
as applicable, to zero, the related Class A Prepayment Percentage will equal 0%.
Notwithstanding the above, if on any Distribution Date, the Class IA or Class
IIA Percentage exceeds the initial related Class IA or Class IIA Percentage,
then both the Class IA and Class IIA Prepayment Percentages for such
Distribution Date will equal 100%.
 
    The "Class IA-3 Prepayment Percentage" will equal the product of (a) the
Class IA-3 Percentage and (b) the Step Down Percentage (as defined below).
 
    The "Class IIA-5 Prepayment Percentage" will equal the product of (a) the
Class IIA-5 Percentage and (b) the Step Down Percentage.
 
    The "Step Down Percentage" for any Distribution Date will be the percentage
indicated below:
 
<TABLE>
<CAPTION>
            DISTRIBUTION DATE OCCURING IN                        STEP DOWN PERCENTAGE
- ------------------------------------------------------  ---------------------------------------
<S>                                                     <C>
January 1997 through December 2001                                            0%
January 2002 through December 2002                                           30%
January 2003 through December 2003                                           40%
January 2004 through December 2004                                           60%
January 2005 through December 2005                                           80%
January 2006 and thereafter                                                 100%
</TABLE>
 
    CROSS-COLLATERALIZATION. On each Distribution Date prior to the occurrence
of the Credit Support Depletion Date, but after the reduction of the Class IA
Principal Balance or Class IIA Principal Balance to zero, all principal on the
Mortgage Loans in the Loan Group relating to the Class A Certificates that have
been paid in full will be paid as principal, after distributions of principal to
the related Class P Certificates, to the remaining Class A Certificates in
accordance with the order set forth under the applicable Class A Principal
Distribution Amount beginning with clause (ii) thereof as described in "--
Distributions of Principal" herein, and in reduction of the Certificate
Principal Balances of such remaining Class A Certificates, provided that on such
Distribution Date (a) the aggregate Certificate Principal Balance of the Class B
Certificates is less than 50% of the initial aggregate Certificate Principal
Balance of such Class B Certificates, if such Distribution Date is prior to the
Distribution Date occurring in January 2002, (b) the aggregate Certificate
Principal Balance of the Class B Certificates is less than 25% of the initial
aggregate Certificate Principal Balance of such Class B Certificates if such
Distribution Date is on or after the Distribution Date occurring in January
2002, (c) the average outstanding principal balance of the Mortgage Loans in
either Loan Group delinquent 60 days or more over the last six months, as a
percentage of the related Class B Loan Group Component Balance, is greater than
or equal to 50% or (d) in the event the Class IA Principal Balance has been
reduced to zero, the Class B Loan Group Component Balance for Loan Group I is
less
 
                                      S-58
<PAGE>
than 25% of the initial Class B Loan Group Component Balance for Loan Group I.
In addition, if on any Distribution Date the aggregate Certificate Principal
Balance of the Class IA Certificates or Class IIA Certificates is greater than
the aggregate Stated Principal Balance of the Mortgage Loans in the related Loan
Group, less the Class P Fraction of any Class P Mortgage Loans in such Group
(the "Undercollateralized Group"), (i) the portion of the Available Distribution
Amount in respect of principal on the Mortgage Loans in the other Loan Group
(the "Overcollateralized Group") (after distributions of principal to the Class
P Certificates and the Class A Certificates of the Overcollateralized Group)
will be distributed to the Class A Certificates of the Undercollateralized Group
in accordance with the order set forth under the applicable Class A Principal
Distribution Amount beginning with clause (ii) thereof, as described above,
until the aggregate Certificate Principal Balance of the Class A Certificates of
the Undercollateralized Group equals the aggregate Stated Principal Balance of
the Mortgage Loans in the related Loan Group less the Class P Fraction of any
Class P Mortgage Loans in such Loan Group and (ii) the Available Distribution
Amount of the Overcollateralized Group will be further reduced (after
distributions to the Overcollateralized Group pursuant to subclauses (a)(i) and
(ii) or (b)(i) and (b)(ii), as applicable, under "-- Priority of Distributions"
herein) in an amount equal to one month's interest on the amount by which the
Undercollateralized Group is undercollateralized at 7.000% per annum if the
Undercollateralized Group is Loan Group I or 8.000% per annum if the
Undercollateralized Group is Loan Group II plus any shortfall of interest on the
Class A Certificates of the Undercollateralized Group from prior Distribution
Dates, including accrued and unpaid interest on such shortfall at the rate
described above (any amount covering interest shortfalls and interest accrued
thereon, will be distributed to the applicable Class or Classes of Certificates
in the priority of interest payable on such Class of Certificates on such
Distribution Date) and such amount will be added to the Available Distribution
Amount of the Undercollateralized Group. In the event the Class II Certificates
are the Undercollateralized Group, the reduction in the Available Distribution
Amount of the Overcollateralized Group to pay interest to the
Undercollateralized Group as described above may cause a shortfall in the amount
of principal and interest otherwise distributable to the Class B Certificates
and further to the amount of principal otherwise distributable to the Class IA
Certificates because the Class I Certificates have Remittance Rates less than
the Class II Certificates. Such shortfall shall be payable from amounts
otherwise distributable first from the Subordinate Certificates in reverse order
of their priority of payment and then from the Class IA Certificates in respect
of principal.
 
    SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT.  The "Subordinate Principal
Distribution Amount" for any Distribution Date will be equal to the excess of
(A) the sum of (i) the Subordinate Percentage for Loan Group I of the Principal
Payment Amount for Loan Group I (exclusive of the portion thereof attributable
to the Class IP Principal Distribution Amount), (ii) the Subordinate Percentage
for Loan Group II of the Principal Payment Amount for Loan Group II (exclusive
of the portion thereof attributable to the Class IIP Principal Distribution
Amount), (iii) the Subordinate Prepayment Percentage for Loan Group I of the
Principal Prepayment Amount for Loan Group I (exclusive of the portion thereof
attributable to the Class IP Principal Distribution Amount), (iv) the
Subordinate Prepayment Percentage for Loan Group II of the Principal Prepayment
Amount for Loan Group II (exclusive of the portion thereof attributable to the
Class IIP Principal Distribution Amount) and (v) the Subordinate Liquidation
Amount (as defined below) over (B) the sum of (x) the amounts required to be
distributed to the Class P Certificates pursuant to clause (iv) of paragraphs
(a) and (b) under "-- Priority of Distributions" herein on such Distribution
Date, (y) in the event that the Class Principal Balance of either the Class IA
or Class IIA Certificates has been reduced to zero, principal paid from the
Available Distribution Amount of the Loan Group related to such Class A
Certificates to the remaining Class A Certificates and (z) the amounts in
respect of principal paid from the Available Distribution Amount of an
Overcollateralized Group to an Undercollateralized Group as described in the
immediately preceding paragraph.
 
    The "Subordinate Percentage" for Loan Group I for any Distribution Date will
equal the excess of 100% over the Class IA Percentage.
 
                                      S-59
<PAGE>
    The "Subordinate Percentage" for Loan Group II for any Distribution Date
will equal the excess of 100% over the Class IIA Percentage.
 
    The "Subordinate Prepayment Percentage" for Loan Group I will equal the
excess of 100% over the Class IA Prepayment Percentage and the "Subordinate
Prepayment Percentage" for Loan Group II will equal the excess of 100% over the
Class IIA Prepayment Percentage.
 
    The "Subordinate Liquidation Amount" will equal the excess, if any, of the
aggregate Liquidation Principal for all Mortgage Loans which became Liquidated
Mortgage Loans during the calendar month preceding the month of the Distribution
Date, over the sum of the Class IA Liquidation Amount and the Class IIA
Liquidation Amount for such Distribution Date.
 
    The rights of the holders of the Class B Certificates to receive
distributions of interest and principal are subordinated to the rights of the
holders of the Senior Certificates to receive distributions of interest and
principal. See "-- Subordination and Allocation of Losses" herein.
 
SUBORDINATION AND ALLOCATION OF LOSSES
 
    The Class B Certificates will be subordinate in right of payment to and
provide credit support to the Senior Certificates, the Junior Subordinate
Certificates will be subordinate in right of payment to and provide credit
support to the Senior Subordinate Certificates, the Class B-3 Certificates will
be subordinate in right of payment to and provide credit support to the Class
B-1 and Class B-2 Certificates and the Class B-2 Certificates will be
subordinate in right of payment to and provide credit support to the Class B-1
Certificates, to the extent described herein. The support provided by the Class
B Certificates is intended to enhance the likelihood of regular receipt by the
Senior Certificates of the full amount of the monthly distributions of interest
(except the Class P Certificates, which are not entitled to interest) and
principal (except the Class X and Class IIA-2 Certificates, which are not
entitled to principal) to which they are entitled and to afford such
Certificates protection against certain losses. The protection afforded to the
Senior Certificates by the Class B Certificates will be accomplished by the
preferential right on each Distribution Date of the Senior Certificates to
receive distributions of interest (except the Class P Certificates) and
principal (except the Class X and Class IIA-2 Certificates) prior to
distributions of interest or principal to the Class B Certificates. The support
provided by the Junior Subordinate Certificates to the Senior Subordinate
Certificates is intended to enhance the likelihood of regular receipt by the
Senior Subordinate Certificates of the full amount of monthly distributions of
interest and principal to which they are entitled and to afford such holders
protection against certain losses. The protection afforded the Class B-1
Certificates by the Class B-2 and Class B-3 Certificates, and the protection
afforded the Class B-2 Certificates by the Class B-3 Certificates, will be
similarly accomplished by the preferential right of the Class B-1 Certificates
to receive distributions of interest and principal, prior to distributions of
interest or principal to the Class B-2 and Class B-3 Certificates and the
preferential right of the Class B-2 Certificates to receive such distributions,
prior to such distributions to the Class B-3 Certificates.
 
    Except for Special Hazard Losses, Fraud Losses and Bankruptcy Losses in
excess of the designated amounts of Special Hazard Coverage, Fraud Coverage and
Bankruptcy Coverage (each, as defined herein), any loss realized with respect to
a Mortgage Loan will be allocated among the Certificates (i) for losses
allocable to principal (a) first, to the Junior Subordinate Certificates, until
the aggregate Class Principal Balance thereof has been reduced to zero, (b)
second, to the Class B-3 Certificates, until the Class B-3 Principal Balance has
been reduced to zero, (c) third, to the Class B-2 Certificates, until the Class
B-2 Principal Balance has been reduced to zero, (d) fourth, to the Class B-1
Certificates, until the Class B-1 Principal Balance has been reduced to zero and
(e) fifth, (x) in the case of losses on a Group I Loan, to the Class I
Certificates, other than the Class IP Certificates, pro rata according to their
Class Principal Balances in reduction of their respective Class Principal
Balances and (y) in the case of losses on a Group II Loan, to the Class II
Certificates, other than the Class IIP Certificates, pro rata according to their
Class Principal Balances in reduction of their respective Class Principal
Balances; PROVIDED, HOWEVER, that in each case if the loss is recognized with
respect to a Class IP or Class IIP Mortgage Loan, the Class IP or Class IIP
Fraction of such
 
                                      S-60
<PAGE>
loss will first be allocated to the Class IP or Class IIP Certificates, as
applicable, and the remainder of such loss will be allocated as described above
in this clause (i), and (ii) for losses allocable to interest (a) first, to the
Junior Subordinate Certificates, in reduction of accrued but unpaid interest
thereon and then in reduction of the aggregate Class Principal Balance, (b)
second, to the Class B-3 Certificates, in reduction of accrued but unpaid
interest thereon and then in reduction of the Class B-3 Principal Balance, (c)
third, to the Class B-2 Certificates, in reduction of accrued but unpaid
interest thereon and then in reduction of the Class B-2 Principal Balance, (d)
fourth, to the Class B-1 Certificates, in reduction of accrued but unpaid
interest thereon and then in reduction of the Class B-1 Principal Balance and
(e) fifth, (x) in the case of losses on a Group I Loan, to the Class I
Certificates, other than the Class IP Certificates, pro rata according to
accrued but unpaid interest thereon and then pro rata according to their Class
Principal Balances in reduction of their respective Class Principal Balances and
(y) in the case of losses on a Group II Loan, to the Class II Certificates,
other than the Class IIP Certificates, pro rata according to accrued but unpaid
interest thereon and then pro rata according to their Class Principal Balances
in reduction of their respective Class Principal Balances. The allocation of the
principal portion of losses relating to a Mortgage Loan to all Classes of
Certificates, other than the Class P Certificates, pro rata according to their
respective Class Principal Balances, except if the loss is recognized with
respect to a Class IP or Class IIP Mortgage Loan, the applicable Class P
Fraction of such loss will first be allocated to the related Class P
Certificates, and the allocation of the interest portion of losses pro rata
according to the amount of interest accrued on each such Class, other than the
Class P Certificates, in reduction thereof and then in reduction of their
related Class Principal Balances, is hereinafter referred to as "Pro Rata
Allocation".
 
    On each Distribution Date, after giving effect to the principal
distributions and allocation of losses as described above, if the Certificate
Principal Balances of all outstanding Certificates exceed the aggregate Stated
Principal Balance of the Mortgage Loans, as of such date, then the excess of the
Certificate Principal Balance of the Certificates over such aggregate Stated
Principal Balance will be deemed to be a principal loss, which will be allocated
to the most junior Class of Subordinate Certificates.
 
    Investors in the Senior Certificates should be aware that because the Class
B Certificates represent interests in both Loan Groups, the Certificate
Principal Balances of Class B Certificates could be reduced to zero as a result
of a disproportionate amount of losses on the Mortgage Loans in one Loan Group.
Therefore, notwithstanding that losses on the Mortgage Loans in one Loan Group
may only be allocated to the related Senior Certificates (except for Special
Hazard Losses, Fraud Losses and Bankruptcy Losses in excess of the applicable
coverage amounts), the allocation to the Class B Certificates of losses on the
Mortgage Loans in the other Loan Group will increase the likelihood that losses
may be allocated to such Senior Certificates.
 
    Special Hazard Losses in excess of the Special Hazard Coverage will be
allocated to the outstanding Classes of Certificates by Pro Rata Allocation.
"Special Hazard Coverage" is expected to equal approximately $2,613,196 as of
the Cut-Off Date. On each anniversary of the Cut-Off Date, the Special Hazard
Coverage will be reduced, but not increased, to an amount equal to the lesser of
(1) the greatest of (a) the aggregate principal balance of the Mortgage Loans
located in the single California zip code area containing the largest aggregate
principal balance of the Mortgage Loans, (b) 1% of the aggregate unpaid
principal balance of the Mortgage Loans and (c) twice the unpaid principal
balance of the largest single Mortgage Loan, in each case calculated as of the
Due Date in the immediately preceding month and (2) the Special Hazard Coverage
as of the Cut-Off Date as reduced by the Special Hazard Losses allocated to the
Certificates since the Cut-Off Date.
 
    Fraud Losses in excess of the Fraud Coverage will be allocated to the
outstanding Classes of Certificates by Pro Rata Allocation. "Fraud Coverage" is
expected to equal approximately $2,934,144 as of the Cut-Off Date. Fraud
Coverage will be reduced, from time to time, by the amount of Fraud Losses
allocated to the Certificates. On each anniversary of the Cut-Off Date, Fraud
Coverage will be reduced to the lesser of (i) on the first, second, third and
fourth anniversaries of the Cut-Off Date, 1.0% of the aggregate principal
balance of the Mortgage Loans as of the Due Date in the preceding
 
                                      S-61
<PAGE>
month and (ii) the excess of the Fraud Coverage as of the Cut-Off Date over
cumulative Fraud Losses allocated to the Certificates to date. On the fifth
anniversary of the Cut-Off Date, Fraud Coverage will be reduced to zero.
 
    Bankruptcy Losses in excess of the Bankruptcy Coverage will be allocated to
the outstanding Classes of Certificates by Pro Rata Allocation. "Bankruptcy
Coverage" is expected to equal approximately $50,000 as of the Cut-Off Date.
Bankruptcy Coverage will be reduced, from time to time, by the amount of
Bankruptcy Losses allocated to the Certificates.
 
    Special Hazard Coverage, Fraud Coverage or Bankruptcy Coverage may also be
reduced upon written confirmation from the Rating Agencies that such reduction
will not adversely affect the then current ratings assigned to the Offered
Certificates by the Rating Agencies. Such a reduction, in the event of Special
Hazard Losses, Fraud Losses or Bankruptcy Losses, could adversely affect the
level of protection afforded the Senior Certificates by subordination of the
Class B Certificates or the level of protection afforded the Senior Subordinate
Certificates by the Junior Subordinate Certificates.
 
    Investors in the Senior Certificates should be aware that the applicable
coverages for such losses cover Mortgage Loans in both Loan Groups. Therefore,
in the event Mortgage Loans in a Loan Group suffer a high level of Special
Hazard Losses, Fraud Losses or Bankruptcy Losses, it will reduce the available
coverage for the Senior Certificates in such Loan Groups and may cause Senior
Certificates relating to the other Loan Group to suffer losses in the event
Mortgage Loans in any Loan Group suffer such losses after the available coverage
has been exhausted.
 
THE CLASS R-1, CLASS R-2 AND CLASS R CERTIFICATES
 
    On each Distribution Date, in addition to payments of interest and principal
to the Residual Certificates described herein, any amounts remaining in the
Certificate Account from the Available Distribution Amount after distributions
of interest and principal on the certificates issued by the Mortgage Trust and
payment of expenses, if any, of the Mortgage Trust will be distributed to the
Class R-1 Certificateholders, together with Excess Liquidation Proceeds (as
defined below), if any. Distributions of such remaining amounts to the Class R-1
Certificateholders will be subordinate to all payments required to be made on
the other Offered Certificates (other than the Class R and Class R-2
Certificates) and each other class of Mortgage Trust certificates on any
Distribution Date. The Class R-2 and Class R Certificates, in addition to
payments of interest and principal on such Certificates described herein, shall
be entitled to any amounts remaining in the First Level Certificate Trust and
Certificate Trust, respectively, if any. Payments of such amounts will be
subordinate to all payments required to be made on the Certificates (other than
the Residual Certificates and the First Level Certificate Trust Certificates).
 
ADVANCES
 
    With respect to each Mortgage Loan, the Master Servicer will make Advances
to the Certificate Account on each Distribution Date to cover any shortfall
between (i) payments scheduled to be received in respect of such Mortgage Loan
and (ii) the amounts actually deposited in the Certificate Account on account of
such payments; provided that the Master Servicer determines, in good faith, on
such Distribution Date that such Advances will be recoverable from Insurance
Proceeds, Liquidation Proceeds or other amounts received with respect to such
Mortgage Loan. Advances are reimbursable to the Master Servicer from cash in the
Certificate Account prior to payments to the Certificateholders if the Master
Servicer determines that such Advances previously made are not recoverable from
Insurance Proceeds, Liquidation Proceeds or other amounts recoverable with
respect to the applicable Mortgage Loan.
 
AVAILABLE DISTRIBUTION AMOUNT
 
    On each Distribution Date, the Available Distribution Amount for any
Distribution Date will be determined separately with respect to Loan Group I and
Loan Group II, and, in each case, will generally include scheduled principal and
interest payments due on the related Due Date, Curtailments received in the
previous calendar month (as set forth below), Payoffs received in the applicable
 
                                      S-62
<PAGE>
period to the extent set forth below and amounts received with respect to
liquidations of Mortgage Loans with respect to such Loan Group in the previous
calendar month, will be distributed by or on behalf of the Trustee to the
Certificateholders, as specified herein.
 
    The Due Date related to each Distribution Date is the first day of the month
in which such Distribution Date occurs. The determination date (the
"Determination Date") is a day not later than the 10th day preceding the related
Distribution Date in the month in which such Distribution Date occurs.
 
    The "Available Distribution Amount" for any Distribution Date for each Loan
Group, as more fully described in the Pooling Agreement, will equal the sum of
the following amounts:
 
        (1) the total amount of all cash received by or on behalf of the Master
    Servicer with respect to the Mortgage Loans in such Loan Group by the
    Determination Date for such Distribution Date and not previously distributed
    (including advances made by servicers, proceeds of liquidated Mortgage
    Loans, 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 previous calendar month
       (together with any interest payment received with such prepayments to the
       extent that it represents the payment of interest accrued on the related
       Mortgage Loans for the period subsequent to the previous calendar month);
 
           (c) all Payoffs received on or after the 15th day of the month of any
       such Determination Date (together with any interest payment received with
       such Payoffs to the extent that it represents the payment of interest
       accrued on the related Mortgage Loans for the period subsequent to the
       previous calendar month), and interest which was accrued and received on
       Payoffs received during the period from the first to the 14th day of the
       month of such Determination Date, which interest shall not be included in
       the calculation of the Available Distribution Amount for any Distribution
       Date;
 
           (d) Liquidation Proceeds and Insurance Proceeds received after the
       previous calendar month;
 
           (e) all amounts in the Certificate Account which are due and
       reimbursable to a servicer or the Master Servicer pursuant to the terms
       of the Pooling Agreement;
 
           (f) the sum of the Servicing Fee and the Master Servicing Fee for
       each related Mortgage Loan; and
 
           (g) the excess, if any, of aggregate Liquidation Proceeds received
       during the previous calendar month over the amount that would have been
       received if Payoffs had been made with respect to the related Mortgage
       Loans on the date such Liquidation Proceeds were received ("Excess
       Liquidation Proceeds");
 
        (2) the total, to the extent not previously distributed, of the
    following amounts, to the extent advanced or received, as applicable, by the
    Master Servicer:
 
           (a) all Advances made by the Master Servicer to the Trustee with
       respect to such Distribution Date relating to the related Mortgage Loans;
       and
 
           (b) any amounts payable as Compensating Interest on such Distribution
       Date relating to the related Mortgage Loans; and
 
        (3) the total amount of any cash received by the Trustee or the Master
    Servicer in respect of the obligation of the Company to repurchase Mortgage
    Loans from the related Loan Group.
 
                                      S-63
<PAGE>
LAST SCHEDULED DISTRIBUTION DATE
 
    The Last Scheduled Distribution Date for all Classes of Certificates is
January 25, 2027, which is the Distribution Date in the month after the
scheduled maturity date for the latest maturing Mortgage Loan in the Mortgage
Pool.
 
    The actual rate of principal payments on the Certificates will depend on the
rate of payments of principal (including Principal Prepayments) on the Mortgage
Loans which, in turn, may be influenced by a variety of economic, geographic and
social factors, as well as the level of prevailing interest rates. No assurance
can be given as to the actual payment experience on the Mortgage Loans.
 
OPTIONAL TERMINATION OF THE MORTGAGE TRUST
 
    On any Distribution Date after the first date on which the aggregate
outstanding principal balance of the Mortgage Loans is less than 10% of the
aggregate principal balance of the Mortgage Loans as of the Cut-Off Date, the
Company may repurchase the Mortgage Loans and all property acquired in respect
of any Mortgage Loan remaining in the Mortgage Trust, and thereby effect the
termination of the Mortgage Trust and, as a result, the Certificate Trust and
the First Level Certificate Trust and the retirement of the Certificates. The
repurchase price will equal, after deductions of related advances by the Master
Servicer, the sum of (1) 100% of the aggregate outstanding principal balance of
such Mortgage Loans (other than Liquidated Mortgage Loans), plus accrued
interest thereon at the applicable Pass-Through Rates through the last day of
the month of such repurchase, less any Bankruptcy Losses realized with respect
to the Mortgage Loans not already allocated to the Certificates, and (2) the
fair market value of all other property remaining in the Mortgage Trust. The
proceeds of such repurchase will be treated as a prepayment of the Mortgage
Loans for purposes of distributions to Certificateholders. Accordingly, an
optional termination of the Mortgage Trust will cause the outstanding principal
balance of the Certificates to be paid in full through the distribution of such
proceeds and the allocation of the associated realized losses, if any, on
Mortgaged Property in the Mortgage Trust the fair market of which is less than
the aggregate principal balance of the related Mortgage Loans as of the time
that the Mortgage Trust acquired such Mortgaged Property, and upon such payment
in full the Mortgage Trust, the First Level Certificate Trust and the
Certificate Trust will be terminated. In no event will the Mortgage Trust
continue beyond the expiration of 21 years from the death of the survivor of
certain persons identified in the Pooling Agreement. See "Description of
Certificates -- Termination" in the Prospectus.
 
SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    The Servicing Fee with respect to each Mortgage Loan in Loan Group I ranges
from a minimum of 0.150% to a maximum of 0.250%, with a weighted average of
0.190%. The Servicing Fee with respect to each Mortgage Loan in Loan Group II
ranges from a minimum of 0.150% to a maximum of 0.250%, with a weighted average
of 0.243%. The Master Servicing Fee with respect to each Mortgage Loan in Loan
Group I ranges from a minimum of 0.050% to a maximum of 0.100 %, with a weighted
average of 0.080%. The Master Servicing Fee with respect to each Mortgage Loan
in Loan Group II ranges from a minimum of 0.040% to a maximum of 0.100%, with a
weighted average of 0.046%. See "Description of Certificates -- Servicing
Compensation and Payment of Expenses" in the Prospectus for information
regarding other possible compensation to the Company and the servicers.
 
    The Company, as Master Servicer, will pay all expenses incurred in
connection with its responsibilities under the Pooling Agreement (subject to
reimbursement as described in the Prospectus), including, without limitation,
the various items of expense enumerated in the Prospectus. In particular,
pursuant to the Pooling Agreement, each month or year, as applicable, the Master
Servicer will be obligated to pay from the Master Servicing Fee the fees of the
Trustee and certain other fees and expenses of the Trust, as prescribed by the
Pooling Agreement.
 
                                      S-64
<PAGE>
                      YIELD AND PREPAYMENT CONSIDERATIONS
 
GENERAL
 
    The effective yield to maturity of each Class of Certificates will depend
upon, among other things, the price at which such Certificates are purchased,
the applicable Remittance Rate, the actual characteristics of the Mortgage Loans
in the related Loan Group, the rate of principal payments (including Principal
Prepayments) on the Mortgage Loans and the rate of liquidations on the Mortgage
Loans in the related Loan Group. The effective yield to maturity to holders of
the Certificates (other than the LIBOR Certificates) will be lower than the
yield to maturity otherwise produced by the applicable Remittance Rate and
purchase price of such Certificates because principal and interest distributions
will not be payable to such Certificateholders until the 25th day of the month
following the month of accrual (without any additional distribution of interest
or earnings thereon with respect to such delay). Except in limited
circumstances, as described herein, principal distributions to the Class I
Certificates and Class II Certificates relate to principal payments on the Group
I Loans and Group II Loans, respectively, and principal distributions to the
Class B Certificates relate to principal payments on both Group I Loans and
Group II Loans.
 
    When a Mortgagor prepays a Mortgage Loan in full between Due Dates for such
Mortgage Loan, the Mortgagor pays interest on the amount prepaid only to the
date of prepayment instead of for the entire month. Also, when a Curtailment is
made on a Mortgage Loan together with the scheduled Monthly Payment for a month
on or after the related Due Date, the principal balance of the Mortgage Loan is
reduced by the amount of the Curtailment as of such Due Date, but such principal
is not distributed to related Certificateholders until the Distribution Date in
the next month; therefore, one month of interest shortfall accrues on the amount
of such Curtailment.
 
    In order to reduce the adverse effect on Certificateholders from the
deficiency in interest payable as a result of a Payoff on a Mortgage Loan in a
Loan Group between its Due Dates, the Master Servicer will pass through
Compensating Interest to the related Certificateholders to the limited extent
and in the manner set forth below. Payoffs received from the first day through
the 14th day of any month will be passed through to related Certificateholders
on the Distribution Date of the same month (except for Payoffs in the related
Loan Group received from the Cut-Off Date through December 14, 1996, which will
be passed through to holders of related Certificates on the January 1997
Distribution Date), rather than on the Distribution Date of the following month,
together with a full month's interest with respect to the prior month.
Accordingly, no Compensating Interest will be payable with respect to Payoffs in
the related Loan Group received during such period. Payoffs received during the
period from the 15th day through the last day of any month will be passed
through on the Distribution Date in the following month, and, in order to
provide for a full month's interest payment with respect to the prior month,
Compensating Interest will be passed through to related Certificateholders with
respect to such period.
 
    The amount available for payment of Compensating Interest on any
Distribution Date will include interest at the Pass-Through Rate to the extent
of interest payments paid by Mortgagors on Payoffs received from the first
through the 14th day of the month of such Distribution Date. To the extent that
the amount available to pay Compensating Interest is insufficient to cover the
deficiency in interest payable as a result of a Payoff on a Mortgage Loan in a
Loan Group, or to the extent that there is an interest deficiency from a
Curtailment, such remaining deficiency will be allocated to the related
Certificates pro rata according to the amount of interest to which each related
Class of Certificates would otherwise be entitled in reduction thereof.
 
    Investors in the Senior Certificates should be aware that because the Class
B Certificates represent interests in both Loan Groups, the Certificate
Principal Balance of the Class B Certificates could be reduced to zero as a
result of a disproportionate amount of realized losses on the Mortgage Loans in
one Loan Group. Therefore, notwithstanding that realized losses on the Mortgage
Loans in one Loan Group may only be allocated to the related Senior Certificates
(except for Special Hazard Losses,
 
                                      S-65
<PAGE>
Fraud Losses and Bankruptcy Losses in excess of the applicable coverage
amounts), the allocation to the Class B Certificates of realized losses on the
Mortgage Loans in the other Loan Group will reduce the subordination provided to
such Senior Certificates by the Class B Certificates and increase the likelihood
that realized losses may be allocated to such Senior Certificates.
 
    Investors in the Lockout Certificates should be aware that because the Class
IIA-5 Certificates generally do not receive any payments of principal prior to
the Distribution Date occurring in January 2002 (other than the Class IIA-5
Liquidation Amount), and the Class IA-3 Certificates generally do not receive
Principal Prepayments until the Distribution Date occurring in January 2002, the
weighted average lives of the Lockout Certificates will be longer than would
otherwise be the case, and the effect on the market value of the Lockout
Certificates arising out of changes in market interest rates or market yields
for similar securities will be greater than for other Classes of Class A
Certificates entitled to such distributions.
 
    The rate of principal payments on the Certificates entitled to receive
principal generally is directly related to the rate of principal payments on the
Mortgage Loans in the related Loan Group, which may be in the form of scheduled
payments or Principal Prepayments. See "Risk Factors" herein and "Yield
Considerations" in the Prospectus. Mortgagors may prepay the Mortgage Loans at
any time without penalty. A higher than anticipated rate of Principal
Prepayments would reduce the aggregate principal balance of the Mortgage Loans
more quickly than expected. As a consequence, aggregate interest payments with
respect to the Mortgage Loans would be substantially less than expected.
Therefore, a higher rate of Principal Prepayments in a Loan Group could result
in a lower than expected yield to maturity on each related Class of Certificates
purchased at a premium and in certain circumstances such investors may not fully
recoup their initial investments. Conversely, a lower than anticipated rate of
Principal Prepayments in a Loan Group would reduce the return to investors on
any related Classes of Certificates purchased at a discount, in that principal
payments with respect to the Mortgage Loans would occur later than anticipated.
There can be no assurance that Certificateholders will be able to reinvest
amounts received with respect to the Certificates at a rate which is comparable
to the applicable Remittance Rate. Investors should fully consider all of the
associated risks.
 
    Prepayments on mortgage loans are commonly measured relative to a prepayment
standard or model. The model used in this Prospectus Supplement (the "Basic
Prepayment Assumption") assumes a per annum rate of prepayment of 0.2% of the
then outstanding principal balance of a pool of mortgage loans in the first
month after formation of such pool of mortgage loans, following which, such
annual prepayment rate increases by 0.2% each month until the 30th month after
formation of such pool of mortgage loans and remains constant at 6% per annum in
the 30th month after formation of such pool of mortgage loans and in each month
thereafter. 0% of the Basic Prepayment Assumption indicates no prepayments are
received; 100% of the Basic Prepayment Assumption indicates prepayments at 1.00
times the Basic Prepayment Assumption; 225% of the Basic Prepayment Assumption
indicates prepayments at 2.25 times the Basic Prepayment Assumption; 260% of the
Basic Prepayment Assumption indicates prepayments at 2.60 times the Basic
Prepayment Assumption; 325% of the Basic Prepayment Assumption indicates
prepayments at 3.25 times the Basic Prepayment Assumption; and 445% of the Basic
Prepayment Assumption indicates prepayments at 4.45 times the Basic Prepayment
Assumption.
 
    The Basic Prepayment Assumption does not purport to be either an historical
description of the prepayment experience of any pool of mortgage loans or a
prediction of the anticipated rate of prepayment of any pool of mortgage loans,
including the Mortgage Pool, and there is no assurance that the Mortgage Loans
will prepay at any given percentage of the Basic Prepayment Assumption. The
actual rate of Principal Prepayments on the Mortgage Loans may be influenced by
a variety of economic, geographic, social and other factors. In general, if
prevailing interest rates fall significantly below the interest rates on the
Mortgage Loans, the Mortgage Loans are likely to be subject to higher prepayment
rates than if prevailing rates remain at or above the interest rates on the
Mortgage Loans.
 
                                      S-66
<PAGE>
Conversely, if interest rates rise above the interest rates on the Mortgage
Loans, the rate of prepayment would be expected to decrease. A comparatively low
interest-rate environment may result in a higher than expected rate of
prepayments on the Mortgage Loans and an earlier than expected retirement of the
Certificates.
 
    The Company makes no representation as to the specific factors that will
affect the prepayment of the Mortgage Loans or the relative importance of such
factors. Factors not identified by the Company or discussed herein may
significantly affect the prepayment rate of the Mortgage Loans. In particular,
the Company makes no representation as to the percentage of the principal amount
of the Mortgage Loans that will be paid as of any date or as to the overall rate
of prepayment.
 
    For purposes of the tables set forth in Appendix A, it is assumed that (i)
scheduled payments on all Mortgage Loans are received on the first day of each
month beginning January 1, 1997, (ii) any Payoffs on the Mortgage Loans are
received on the last day of each month beginning in December 1996 and include 30
days of interest thereon, (iii) there are no defaults or delinquencies on the
Mortgage Loans, (iv) optional termination of the Mortgage Trust does not occur,
(v) the Mortgage Loans in each Loan Group are comprised of two subgroups of
hypothetical mortgage loans which have the common characteristics indicated:
 
             GROUPS OF HYPOTHETICAL MORTGAGE LOANS -- LOAN GROUP I
 
<TABLE>
<CAPTION>
 UNPAID PRINCIPAL   ORIGINAL TERM    MORTGAGE     PASS-THROUGH   REMAINING TERM
     BALANCE          (MONTHS)     INTEREST RATE      RATE          (MONTHS)
- ------------------  -------------  -------------  -------------  ---------------
<S>                 <C>            <C>            <C>            <C>
$     6,726,740.76       180          6.91412013%    6.65009250%       167
     39,821,115.78       180          7.72605323     7.45527637        172
</TABLE>
 
             GROUPS OF HYPOTHETICAL MORTGAGE LOANS -- LOAN GROUP II
 
<TABLE>
<CAPTION>
 UNPAID PRINCIPAL   ORIGINAL TERM    MORTGAGE     PASS-THROUGH   REMAINING TERM
     BALANCE          (MONTHS)     INTEREST RATE      RATE          (MONTHS)
- ------------------  -------------  -------------  -------------  ---------------
<S>                 <C>            <C>            <C>            <C>
$    33,356,670.34       360          8.04927400%    7.76166991%       358
     66,802,684.60       360          8.66269088     8.37396786        358
</TABLE>
 
(vi) there are no partial prepayments on the Mortgage Loans and prepayments are
computed after giving effect to scheduled payments received on the following
day, (vii) the Mortgage Loans prepay at the indicated constant percentages of
the Basic Prepayment Assumption, (viii) the date of issuance for the
Certificates is December 27, 1996, (ix) cash distributions are received by the
Certificateholders on the 25th day of each month when due and (x) the scheduled
monthly payments for each Mortgage Loan are computed based upon its unpaid
principal balance, Mortgage Interest Rate and remaining term such that the
Mortgage Loan will fully amortize on its maturity date (collectively, the
"Modeling Assumptions"). The approximate Class Principal Balances of the Junior
Subordinate Certificates as of the Cut Off Date will be as follows: Class B-4,
$440,122; Class B-5, $513,475; and Class B-6, $513,476.
 
    Any discrepancy between the actual characteristics of the Mortgage Loans and
the characteristics of the Mortgage Loans set forth above may affect the
percentages of the initial Class Principal Balances set forth in the tables and
the weighted average lives of the Offered Certificates. In addition, to the
extent that the characteristics of the Mortgage Loans differ and the initial
Class Principal Balances differ, from those assumed in preparing the tables in
Appendix A, the outstanding Class Principal Balance of any Class of Offered
Certificates may be reduced to zero earlier or later than indicated by such
tables.
 
    Variations in actual prepayment experience may increase or decrease the
percentages of the original outstanding Class Principal Balances and the
weighted average lives shown in the tables in Appendix A. Such variations may
occur even if the average prepayment experience of all the Mortgage
 
                                      S-67
<PAGE>
Loans equals the indicated percentage of the Basic Prepayment Assumption. There
is no assurance, however, that prepayment of the Mortgage Loans will conform to
any given percentage of the Basic Prepayment Assumption.
 
    Based on the foregoing assumptions, the tables indicate the projected
weighted average lives of the Offered Certificates and set forth the percentages
of the initial outstanding Class Principal Balance of each such Class of Offered
Certificates that would be outstanding after each of the dates shown at various
constant percentages of the Basic Prepayment Assumption.
 
YIELD CONSIDERATIONS WITH RESPECT TO THE CLASS X, INVERSE FLOATER AND CLASS P
CERTIFICATES
 
    The yield to investors in the LIBOR Certificates will be sensitive to
fluctuations in LIBOR. The yield to maturity on the Inverse Floater Certificates
will be extremely sensitive to fluctuations in LIBOR, and the Remittance Rates
on such Certificates will vary inversely with LIBOR. Changes in LIBOR may not
correlate with changes in prevailing mortgage interest rates. It is possible
that lower prevailing mortgage interest rates, which might be expected to result
in faster prepayments, could occur concurrently with an increased level of
LIBOR. Conversely, higher prevailing mortgage interest rates (which would be
expected to result in slower prepayments) could occur concurrently with a lower
level of LIBOR.
 
    The yields to maturity on the Class X and Class P Certificates will be
extremely sensitive to the level of both the timing of and overall rate of
receipt of Principal Prepayments on the Mortgage Loans in the related Loan
Group. The interest payable to the Class IX Certificates is based on the
weighted average of the Stripped Interest Rates (as defined herein) of the
15-Year Premium Rate Mortgage Loans. The interest payable to the Class IIX
Certificates is based on the weighted average of the Stripped Interest Rates of
the 30-Year Premium Rate Mortgage Loans. Therefore the yield to maturity on the
Class X Certificates will generally decrease as a result of faster than expected
Principal Prepayments on such Premium Rate Mortgage Loans. Prospective investors
should fully consider the risks associated with an investment in the Class X
Certificates, including the possibility that if the rate of Principal
Prepayments on the Mortgage Loans in the related Loan Group is rapid, such
investors may not fully recoup their initial investments. Because the principal
payable with respect to the Class IP Certificates (which are entitled to receive
distributions of principal only) is derived from Group I Loans with Pass-Through
Rates that are lower than 7.000%, the yield to maturity on the Class IP
Certificates will be adversely affected by slower than expected prepayments of
Group I Loans with Pass-Through Rates less than 7.000%. Because the principal
payable with respect to the Class IIP Certificates (which are entitled to
receive distributions of principal only) is derived from Group II Loans with
Pass-Through Rates that are lower than 8.000%, the yield to maturity on the
Class IIP Certificates will be adversely affected by slower than expected
prepayments of Group II Loans with Pass-Through Rates less than 8.000%. Because
the interest payable on the Class IX and Class IIX Certificates and the
principal distributable to the Class IP and Class IIP Certificates are in part
derived from different groups of Mortgage Loans within the related Loan Group,
it is possible that faster than expected prepayments with respect to the Class X
Certificates may occur at the same time as slower than expected prepayments with
respect to the Class P Certificates.
 
    To illustrate the significance of different rates of prepayment and, in the
case of the Inverse Floater Certificates, different levels of LIBOR, on the
distributions on the Class X and Class P and Inverse Floater Certificates, the
following tables indicate the approximate pre-tax yields to maturity (on a
corporate bond equivalent basis) under the different percentages of the Basic
Prepayment Assumption indicated and, with respect to the Inverse Floater
Certificates, different levels of LIBOR. Because the rate of distribution of
interest on the Class X Certificates and the Inverse Floater Certificates and
the rate of distribution of principal on the Class P Certificates will be
directly related to the actual amortization (including prepayments) of the
Mortgage Loans, which will include Mortgage Loans that have remaining terms to
maturity shorter or longer than those assumed and interest rates higher or lower
than those assumed, the pre-tax yields to maturity on the Class X, Inverse
Floater and Class P Certificates are likely to differ from those shown in the
following tables even if all
 
                                      S-68
<PAGE>
the Mortgage Loans prepay at the indicated constant percentages of the Basic
Prepayment Assumption and the weighted average remaining terms to maturity of
the Mortgage Loans are as assumed and, for the Inverse Floater Certificates,
LIBOR, remains at the levels assumed. Any differences between such assumptions
and the actual characteristics and performance of the Mortgage Loans and of the
Certificates may result in yields to maturity being different from those shown
in such tables. Discrepancies between assumed and actual characteristics and
performances underscore the hypothetical nature of the tables, which are
provided only to give a general sense of the sensitivity of yields to maturity
in varying prepayment scenarios and, for the Inverse Floater Certificates,
different levels of LIBOR. In addition, it is highly unlikely that the Mortgage
Loans will prepay at a constant level of the Basic Prepayment Assumption until
maturity or that all of such Mortgage Loans will prepay at the same rate or, for
the Inverse Floater Certificates, that the levels of LIBOR will remain constant.
The timing of changes to the rate of prepayments or rate of LIBOR may
significantly affect the actual yield to maturity to an investor, even if the
average rate of Principal Prepayments or average rate of LIBOR is consistent
with an investor's expectation. In general, the earlier a payment of principal
on the Mortgage Loans in the related Loan Group or change in LIBOR, the greater
the effect on an investor's yield to maturity. As a result, the effect on an
investor's yield to maturity of Principal Payments occurring at a rate higher
(or lower) than the rate anticipated by the investor during the period
immediately following the issuance of the Certificates or changes in the level
of LIBOR, as applicable, occurring at a rate higher (or lower) than the rate
anticipated by the investor during the period immediately following the issuance
of the Certificates will not be equally offset by a subsequent like reduction
(or increase) in the rate of Principal Prepayments or level of LIBOR.
 
    In addition, the yield to maturity on the Class X and the Inverse Floater
Certificates may be adversely affected if an optional termination of the
Mortgage Trust occurs. In addition, in the event of very high Principal
Prepayments of Group I Loans and the reduction of the Class IA Principal Balance
to zero, subject to certain limitations set forth herein, all principal (after
giving effect to the distribution of the Class IP Certificates) of the Group I
Loans will be distributed to the Class IIA Certificates, and therefore, may
adversely affect the yield of the Inverse Floater Certificates.
 
    The tables set forth below are based on the Modeling Assumptions described
on page S-67 and assume further that (i) the Certificates are purchased at
prices (which include accrued interest in the case of the Class X Certificates)
equal to those set forth in the tables and (ii) in the case of the Inverse
Floater Certificates, on the LIBOR Determination Date in January 1997 and on
each LIBOR Determination Date thereafter, the applicable LIBOR will be the rate
shown and on the first Distribution Date, the Inverse Floater Certificateholders
will receive 30 days of interest at their respective initial Remittance Rates.
There can be no assurance that the Mortgage Loans will have the assumed
characteristics, will prepay at any of the rates shown herein, that the purchase
prices of the Certificates will be as assumed or that the pre-tax yields to
maturity will correspond to any of the pre-tax yields shown herein, that for,
the Inverse Floater Certificates that the rate of LIBOR will correspond to the
levels shown herein, or that the purchase prices of the Inverse Floater
Certificates will be as assumed. The actual prices to be paid on the Class X,
Inverse Floater and Class P Certificates have not been determined and will be
dependent on the characteristics of the Mortgage Pool as ultimately constituted.
In addition to any other factors an investor may deem material, each investor
must make its own decision as to the appropriate prepayment assumptions to be
used and, in the case of the Inverse Floater Certificates, the appropriate rates
of LIBOR to be assumed in deciding whether or not to purchase a Class of
Certificates.
 
                    SENSITIVITY OF PRE-TAX YIELD TO MATURITY
                OF THE CLASS IX CERTIFICATES TO PREPAYMENTS AT A
                            SPECIFIED ASSUMED PRICE
 
<TABLE>
<CAPTION>
                                  PERCENTAGE OF THE BASIC PREPAYMENT ASSUMPTION
                         ----------------------------------------------------------------
ASSUMED PRICE               0%        100%       225%       260%       325%       445%
- -----------------------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                      <C>        <C>        <C>        <C>        <C>        <C>
$531,082...............     29.83%     24.38%     17.37%     15.37%     11.59%      4.45%
</TABLE>
 
                                      S-69
<PAGE>
    On the basis of a constant prepayment rate of approximately 518% of the
Basic Prepayment Assumption, a purchase price of $531,082, which includes
accrued interest, and the assumptions described above, the pre-tax yield to
maturity of the Class IX Certificates would be approximately 0%. If the actual
prepayment rate were to exceed the rates assumed above, even for one month,
while equaling such rates for all other months, an investor in the Class IX
Certificates would not fully recoup the initial purchase price of such
Certificates.
 
                    SENSITIVITY OF PRE-TAX YIELD TO MATURITY
               OF THE CLASS IIX CERTIFICATES TO PREPAYMENTS AT A
                            SPECIFIED ASSUMED PRICE
 
<TABLE>
<CAPTION>
                                  PERCENTAGE OF THE BASIC PREPAYMENT ASSUMPTION
                         ----------------------------------------------------------------
ASSUMED PRICE               0%        100%       225%       260%       325%       445%
- -----------------------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                      <C>        <C>        <C>        <C>        <C>        <C>
$923,642...............     27.42%     22.28%     15.72%     13.85%     10.36%      3.79%
</TABLE>
 
    On the basis of a constant prepayment rate of approximately 513% of the
Basic Prepayment Assumption, a purchase price of $923,642, which includes
accrued interest, and the assumptions described above, the pre-tax yield to
maturity of the Class IIX Certificates would be approximately 0%. If the actual
prepayment rate were to exceed the rates assumed above, even for one month,
while equaling such rates for all other months, an investor in the Class IIX
Certificates would not fully recoup the initial purchase price of such
Certificates.
 
                    SENSITIVITY OF PRE-TAX YIELD TO MATURITY
                OF THE CLASS IP CERTIFICATES TO PREPAYMENTS AT A
                            SPECIFIED ASSUMED PRICE
 
<TABLE>
<CAPTION>
                                  PERCENTAGE OF THE BASIC PREPAYMENT ASSUMPTION
                         ----------------------------------------------------------------
ASSUMED PRICE               0%        100%       225%       260%       325%       445%
- -----------------------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                      <C>        <C>        <C>        <C>        <C>        <C>
$235,374...............      4.67%      6.30%      8.75%      9.50%     10.97%     13.86%
</TABLE>
 
                    SENSITIVITY OF PRE-TAX YIELD TO MATURITY
               OF THE CLASS IIP CERTIFICATES TO PREPAYMENTS AT A
                            SPECIFIED ASSUMED PRICE
 
<TABLE>
<CAPTION>
                                  PERCENTAGE OF THE BASIC PREPAYMENT ASSUMPTION
                         ----------------------------------------------------------------
ASSUMED PRICE               0%        100%       225%       260%       325%       445%
- -----------------------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                      <C>        <C>        <C>        <C>        <C>        <C>
$645,929...............      2.19%      4.14%      7.07%      7.91%      9.43%     12.11%
</TABLE>
 
                    SENSITIVITY OF PRE-TAX YIELD TO MATURITY
            OF THE CLASS IIA-2 CERTIFICATES TO PREPAYMENTS AND LIBOR
    AT AN ASSUMED PURCHASE PRICE OF 5.00% OF THE CLASS IIA-2 NOTIONAL AMOUNT
 
<TABLE>
<CAPTION>
                                          PERCENTAGE OF THE BASIC PREPAYMENT ASSUMPTION
                                    ---------------------------------------------------------
LIBOR                                  100%        225%       260%        325%        445%
- ----------------------------------  ----------  ----------  ---------  ----------  ----------
<S>                                 <C>         <C>         <C>        <C>         <C>
3.3750%...........................     108.59%     101.48%     99.42%      95.52%      88.10%
4.3750%...........................      82.47%      74.92%     72.71%      68.51%      60.46%
5.3750%...........................      57.38%      49.14%     46.69%      41.98%      32.93%
6.3750%...........................      33.22%      23.85%     20.98%      15.39%       4.51%
7.3750%...........................       9.48%      (1.89%)    (5.58%)    (13.11%)    (28.01%)
</TABLE>
 
    The pre-tax yields to maturity set forth in the preceding tables were
calculated by determining the monthly discount rates (whether positive or
negative) which, when applied to the assumed streams of cash flows to be paid on
the Class X, the Inverse Floater and Class P Certificates, would cause the
discounted present values of such assumed streams of cash flows to equal the
assumed
 
                                      S-70
<PAGE>
purchase price, including accrued interest, where applicable. These monthly
discount rates were converted to corporate bond equivalent rates, which are
higher than the monthly discount rates because they are based on semiannual
compounding. These yields to maturity do not take into account the different
interest rates at which investors may be able to reinvest funds received by them
as distributions on the Class X, the Inverse Floater or Class P Certificates and
thus do not reflect the return on any investment in the Class X, the Inverse
Floater or Class P Certificates when any reinvestment rates other than the
discount rates are considered.
 
    There are no historical prepayment data available for the Mortgage Pool, and
comparable data are not available because the Mortgage Loans do not constitute a
representative sample of mortgage loans generally. In addition, historical data
available with respect to mortgage loans underlying mortgage pass-through
certificates issued by the Government National Mortgage Association ("GNMA"),
FNMA and FHLMC may not be comparable to prepayments expected to be experienced
by the Mortgage Pool because the Mortgage Loans may have characteristics which
differ from the mortgage loans underlying certificates issued by GNMA, FNMA and
FHLMC.
 
    The Company makes no representation that the Mortgage Loans will prepay in
the manner or at any of the rates assumed above. Each investor must make its own
decision as to the appropriate prepayment assumptions to be used in deciding
whether or not to purchase any of the Certificates. Since the rate of principal
payments (including prepayments) with respect to, and repurchases of, the
Mortgage Loans will significantly affect the yields to maturity on the Offered
Certificates, prospective investors are urged to consult their investment
advisors as to both the anticipated rate of future principal payments (including
prepayments) on the Mortgage Loans and the suitability of the Certificates to
their investment objectives.
 
YIELD CONSIDERATIONS WITH RESPECT TO THE SENIOR SUBORDINATE CERTIFICATES
 
    The tables beginning on page S-72 have been prepared using the Modeling
Assumptions, except that it has been assumed that (i) defaults occur monthly on
the last day of the previous month at rates which in the aggregate are equal to
the following percentages of the aggregate principal balance of the Mortgage
Loans as of the Cut-Off Date for the number of months indicated (and none
thereafter); (ii) the scheduled monthly payments for each Mortgage Loan are
computed based upon its unpaid principal balance after giving effect to any
default; (iii) certain delinquency experience levels specified in the Pooling
Agreement for the determination of the Class IA and Class IIA Prepayment
Percentage and the Subordinate Prepayment Percentage are not exceeded; and (iv)
prepayments are calculated as assumed above but before giving effect to any such
defaults (unless such defaults would reduce the aggregate principal balance of
the Mortgage Loans below the aggregate amount of such assumed prepayments, in
which case prepayments are limited to the outstanding principal balance of the
Mortgage Loans after such defaults).
 
<TABLE>
<CAPTION>
    PRINCIPAL BALANCE OF
          DEFAULTED
     MORTGAGE LOANS AS A
         PERCENTAGE
 OF THE AGGREGATE PRINCIPAL    NUMBER OF MONTHS
   BALANCE OF THE MORTGAGE       COMMENCING IN
LOANS AS OF THE CUT-OFF DATE     DECEMBER 1997
- -----------------------------  -----------------
<S>                            <C>
            0.00%                    N.A.
            0.85%                     24
            1.25%                     24
            3.00%                     24
</TABLE>
 
    For example, if defaulted Mortgage Loans total 0.85% of the aggregate
principal balance of the Mortgage Loans as of the Cut-Off Date as assumed for
purposes of the following tables (approximately $1,247,011, which is 0.85% of
$146,707,211), and such defaults occur at an amount per month equal to
approximately $51,959 (1/24th of $1,247,011) in each month of the 24-month
period commencing in December 1997, the effect on the pre-tax yield to maturity
of the Senior Subordinate Certificates from such aggregate defaults on the
Mortgage Loans over such 24-month period would be as shown in the tables below
for Basic Prepayment Assumptions of 0%, 100%, 225%, 260%, 325% and 445%.
 
                                      S-71
<PAGE>
    In addition, it was assumed that (i) realized losses on liquidation of the
Mortgage Loans occur at a rate of 20% or 40% of the outstanding principal
balance of such defaulted Mortgage Loans at the time of default as indicated in
the table (referred to as a "Loss Severity Percentage") in the month in which
the Mortgage Loans first default, (ii) there are no Special Hazard Losses, Fraud
Losses or Bankruptcy Losses, (iii) the Senior Subordinate Certificates are
purchased at the assumed purchase prices equal to the indicated percentages of
the Class B-1, Class B-2 or Class B-3 Principal Balance, as applicable, plus
accrued interest from the Cut-Off Date and (iv) all scheduled payments on
Mortgage Loans are advanced by the Master Servicer whether or not received from
the related Mortgagors.
 
    The rate of distributions in reduction of the Class Principal Balance of any
Class of Senior Subordinate Certificates will be related to the actual
amortization schedule of the Mortgage Loans; accordingly, the interest
distributions and distributions in reduction of the Class Principal Balances of
the Senior Subordinate Certificates may result in yields to maturity which
differ from those reflected below.
 
    The Mortgage Loans will not have the characteristics assumed, and it is
unlikely that they will prepay at any of the constant rates specified. The
assumed percentages of the Basic Prepayment Assumption, the principal balance of
the defaulted Mortgage Loans and the loss severities on the Mortgage Loans shown
in the tables below are for illustrative purposes only and the Company makes no
representations with respect to the reasonableness of such assumptions or that
the actual rates of prepayment and liquidation and loss severity experience of
the Mortgage Loans will in any way correspond to any of the assumptions made
herein. In addition, it is unlikely that liquidations will occur in the month of
default, and the timing of such liquidations may cause the pre-tax yield to
maturity of the Senior Subordinate Certificates to differ from those shown
below.
 
            PRE-TAX YIELD TO MATURITY OF THE CLASS B-1 CERTIFICATES
            AT AN ASSUMED PURCHASE PRICE OF 100.75% OF THE CLASS B-1
         PRINCIPAL BALANCE PLUS ACCRUED INTEREST FROM THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
   DEFAULTED MORTGAGE
  LOANS EXPRESSED AS A
    PERCENTAGE OF THE
   AGGREGATE PRINCIPAL
 BALANCE OF THE MORTGAGE
 LOANS AS OF THE CUT-OFF
 DATE OVER THE 24-MONTH                   PERCENTAGE OF THE BASIC PREPAYMENT ASSUMPTION                       LOSS
  PERIOD COMMENCING IN     ----------------------------------------------------------------------------     SEVERITY
      DECEMBER 1997            0%          100%         225%         260%         325%         445%        PERCENTAGE
- -------------------------  -----------  -----------  -----------  -----------  -----------  -----------  ---------------
<S>                        <C>          <C>          <C>          <C>          <C>          <C>          <C>
               0                7.76%        7.72%        7.68%        7.67%        7.66%        7.64%             0%
            0.85%               7.73%        7.71%        7.68%        7.67%        7.66%        7.64%            20%
            0.85%               7.70%        7.71%        7.68%        7.67%        7.66%        7.64%            40%
            1.25%               7.72%        7.71%        7.68%        7.67%        7.66%        7.64%            20%
            1.25%               7.69%        7.69%        7.67%        7.67%        7.66%        7.64%            40%
            3.00%               7.68%        7.69%        7.67%        7.67%        7.65%        7.64%            20%
            3.00%               7.65%        7.68%        7.66%        7.66%        7.65%        7.64%            40%
</TABLE>
 
                                      S-72
<PAGE>
            PRE-TAX YIELD TO MATURITY OF THE CLASS B-2 CERTIFICATES
            AT AN ASSUMED PURCHASE PRICE OF 99.75% OF THE CLASS B-2
         PRINCIPAL BALANCE PLUS ACCRUED INTEREST FROM THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
   DEFAULTED MORTGAGE
  LOANS EXPRESSED AS A
    PERCENTAGE OF THE
   AGGREGATE PRINCIPAL
 BALANCE OF THE MORTGAGE
 LOANS AS OF THE CUT-OFF
 DATE OVER THE 24-MONTH                   PERCENTAGE OF THE BASIC PREPAYMENT ASSUMPTION                       LOSS
  PERIOD COMMENCING IN     ----------------------------------------------------------------------------     SEVERITY
      DECEMBER 1997            0%          100%         225%         260%         325%         445%        PERCENTAGE
- -------------------------  -----------  -----------  -----------  -----------  -----------  -----------  ---------------
<S>                        <C>          <C>          <C>          <C>          <C>          <C>          <C>
               0                7.88%        7.85%        7.83%        7.82%        7.82%        7.81%             0%
            0.85%               7.87%        7.85%        7.83%        7.82%        7.82%        7.81%            20%
            0.85%               7.88%        7.85%        7.83%        7.82%        7.82%        7.81%            40%
            1.25%               7.88%        7.85%        7.83%        7.82%        7.82%        7.81%            20%
            1.25%               7.88%        7.85%        7.83%        7.82%        7.82%        7.81%            40%
            3.00%               7.88%        7.85%        7.83%        7.82%        7.82%        7.81%            20%
            3.00%               7.91%        7.86%        7.83%        7.83%        7.82%        7.81%            40%
</TABLE>
 
            PRE-TAX YIELD TO MATURITY OF THE CLASS B-3 CERTIFICATES
            AT AN ASSUMED PURCHASE PRICE OF 97.25% OF THE CLASS B-3
         PRINCIPAL BALANCE PLUS ACCRUED INTEREST FROM THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
   DEFAULTED MORTGAGE
  LOANS EXPRESSED AS A
    PERCENTAGE OF THE
   AGGREGATE PRINCIPAL
 BALANCE OF THE MORTGAGE
 LOANS AS OF THE CUT-OFF
 DATE OVER THE 24-MONTH                   PERCENTAGE OF THE BASIC PREPAYMENT ASSUMPTION                       LOSS
  PERIOD COMMENCING IN     ----------------------------------------------------------------------------     SEVERITY
      DECEMBER 1997            0%          100%         225%         260%         325%         445%        PERCENTAGE
- -------------------------  -----------  -----------  -----------  -----------  -----------  -----------  ---------------
<S>                        <C>          <C>          <C>          <C>          <C>          <C>          <C>
               0                8.19%        8.20%        8.22%        8.22%        8.23%        8.24%             0%
            0.85%               8.17%        8.20%        8.22%        8.22%        8.23%        8.24%            20%
            0.85%               8.16%        8.19%        8.22%        8.23%        8.23%        8.25%            40%
            1.25%               8.17%        8.20%        8.22%        8.22%        8.23%        8.24%            20%
            1.25%               8.16%        8.19%        8.21%        8.22%        8.24%        8.25%            40%
            3.00%               8.16%        8.18%        8.21%        8.22%        8.23%        8.25%            20%
            3.00%               4.24%        3.87%        2.85%        2.52%        1.95%        1.10%            40%
</TABLE>
 
    The pre-tax yields to maturity set forth in the preceding tables were
calculated by determining the monthly discount rates which, when applied to the
assumed streams of cash flows to be paid on each Class of Senior Subordinate
Certificates, would cause the discounted present value of such assumed stream of
cash flows to equal the assumed offering prices (including accrued interest) of
each Class of the Senior Subordinate Certificates set forth above. In all cases
monthly rates are then converted to the corporate bond equivalent yields shown
above. Implicit in the use of any discounted present value or internal rate of
return calculation such as these is the assumption that intermediate cash flows
are invested at the discount rate or internal rate of return. Thus these
calculations do not take into account the different interest rates at which
investors may be able to reinvest funds received by them as distributed on the
Senior Subordinate Certificates. Consequently, these yields to maturity do not
purport to reflect the return on any investment in the Senior Subordinate
Certificates when such reinvestment rates are considered.
 
    The characteristics of the Mortgage Loans will not correspond exactly to
those assumed in preparing the tables above. The yield to maturity of each Class
of the Senior Subordinate Certificates therefore will differ even if all the
Mortgage Loans prepay monthly at the related assumed prepayment rate. In
addition, it is not likely that the Mortgage Loans will prepay at the same
percentage of
 
                                      S-73
<PAGE>
the Basic Prepayment Assumption, and the timing of changes in the rate of
prepayments may affect significantly the yield to maturity received by a holder
of a Class of Senior Subordinate Certificates. There are no historical
prepayment data available for the Mortgage Pool, and comparable data are not
available because the Mortgage Loans do not constitute a representative sample
of mortgage loans generally. In addition, historical data available with respect
to mortgage loans underlying mortgage pass-through certificates issued by GNMA,
FNMA or FHLMC may not be comparable to prepayments expected to be experienced by
the Mortgage Pool, because the Mortgage Loans may have characteristics which
differ from mortgage loans underlying certificates issued by GNMA, FNMA and
FHLMC.
 
    The Company makes no representation that the Mortgage Loans will prepay in
the manner or at any of the rates assumed above. Each investor must make its own
decision as to the appropriate prepayment assumptions to be used in deciding
whether or not to purchase any of the Senior Subordinate Certificates. Since the
rate of principal payments (including Principal Prepayments) with respect to,
and repurchases of, the Mortgage Loans will significantly affect the yield to
maturity on each Class of the Senior Subordinate Certificates, prospective
investors are urged to consult their investment advisors as to both the
anticipated rate of future principal payments (including Principal Prepayments)
on the Mortgage Loans and the suitability of the Senior Subordinate Certificates
to their investment objectives.
 
ADDITIONAL YIELD CONSIDERATIONS APPLICABLE SOLELY TO THE RESIDUAL CERTIFICATES
 
    The Residual Certificateholders' after-tax rate of return on their
Certificates will reflect their pre-tax rate of return, reduced by the taxes
required to be paid with respect to such Certificates. Holders of Residual
Certificates may have tax liabilities with respect to their Certificates during
the early years of the REMIC's term that substantially exceed any distributions
payable thereon during any such period. In addition, holders of Residual
Certificates may have tax liabilities with respect to their Certificates the
present value of which substantially exceeds the present value of distributions
payable thereon and of any tax benefits that may arise with respect thereto.
Accordingly, the after-tax rate of return on the Residual Certificates may be
negative or may otherwise be significantly adversely affected. The timing and
amount of taxable income attributable to the Residual Certificates will depend
on, among other things, the timing and amounts of prepayments and losses
experienced with respect to the Mortgage Pool.
 
    The Residual Certificateholders should consult their own tax advisors as to
the effect of taxes and the receipt of any payments made to such holders in
connection with the purchase of the Residual Certificates on after-tax rates of
return on the Residual Certificates. See "Certain Federal Income Tax
Consequences" herein and in the Prospectus.
 
ADDITIONAL INFORMATION
 
    The Company intends to file with the Securities and Exchange Commission
certain additional yield tables and other computational materials with respect
to one or more Classes of the Offered Certificates on a Current Report on Form
8-K. Such tables and materials were prepared by the Underwriter at the request
of certain prospective investors, based on assumptions provided by, and
satisfying the special requirements of, such prospective investors. Such tables
and materials are preliminary in nature, and the information contained therein
is subject to, and superseded by, the information in this Supplement.
 
                              CREDIT ENHANCEMENTS
 
SUBORDINATION
 
    The holders of the Senior Certificates are entitled to receive distributions
of interest (except the Class P Certificates, which are not entitled to
interest) and principal (except the Class X and Class IIA-2 Certificates, which
are not entitled to principal) before distributions of interest or principal to
the holders of the Class B Certificates. See "Description of the Certificates --
Priority of Distributions" herein. Losses on the Mortgage Loans will be
allocated, in each case until the applicable Class Principal Balances have been
reduced to zero, first, to the Junior Subordinate Certificates; second, to the
 
                                      S-74
<PAGE>
Class B-3 Certificates; third, to the Class B-2 Certificates; fourth, to the
Class B-1 Certificates; fifth, to the outstanding Classes of Senior Certificates
in the manner described herein; PROVIDED, HOWEVER, that if the loss is
recognized with respect to a Class IP Mortgage Loan, then the Class IP Fraction
of such loss will first be allocated to the Class IP Certificates and the
remainder of such loss will be allocated as described above; PROVIDED, FURTHER,
that if the loss is recognized with respect to a Class IIP Mortgage Loan, then
the Class IIP Fraction of such loss will first be allocated to the Class IIP
Certificates and the remainder of such loss will be allocated as described
above; and PROVIDED, FURTHER, that only a certain specified amount of Special
Hazard Losses, Fraud Losses and Bankruptcy Losses will be allocated solely to
the Class B Certificates, following which such losses will be allocated among
all outstanding Classes of Certificates by Pro Rata Allocation. See "Description
of the Certificates -- Priority of Distributions" and " -- Subordination and
Allocation of Losses" herein.
 
    On each Distribution Date, after giving effect to the principal
distributions and allocation of losses as described above, if the Certificate
Principal Balances of all outstanding Certificates exceed the aggregate Stated
Principal Balance of the Mortgage Loans, as of such date, then the excess of the
Certificate Principal Balance of the Certificates over such aggregate Stated
Principal Balance will be deemed to be a principal loss, which will be allocated
to the most junior Class of Subordinate Certificates.
 
SHIFTING OF INTERESTS
 
    The Senior Certificates entitled to principal, other than the Lockout
Certificates, will receive 100% of Principal Prepayments received with respect
to the Mortgage Loans in the related Loan Group until the fifth anniversary of
the first Distribution Date. During the next four years, the Senior
Certificates, other than the Lockout Certificates, will receive a
disproportionately large, but decreasing, share of Principal Prepayments
received with respect to the Mortgage Loans in the related Loan Group. This will
result in an acceleration of the amortization of such Senior Certificates, other
than the Lockout Certificates, subject to the priorities described in
"Description of the Certificates -- Distributions of Principal" herein,
enhancing the likelihood that holders of such Classes of Certificates will be
paid the full amount of principal to which they are entitled. See "Description
of the Certificates -- Distributions of Principal" herein.
 
    Although the Lockout Certificates are Senior Certificates, the Class IIA-5
Certificates will generally not be entitled to receive any principal
distributions until January 2002 (other than the Class IIA-5 Liquidation Amount)
and the Class IA-3 Certificates will not be entitled to receive any Principal
Prepayments until January 2002. Therefore, the Class IA-3 and Class IIA-5
Certificates will not be entitled to receive the disproportionate allocation of
Principal Prepayments that the other Senior Certificates are entitled to
receive. See "Description of the Certificates -- Distributions of Principal".
 
                    CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    For federal income tax purposes, the Company will cause elections to be made
to treat the Mortgage Trust, the First Level Certificate Trust and the
Certificate Trust as REMICS. The certificates issued by the Mortgage Trust, the
First Level Certificate Trust and the Certificate Trust, other than the Class
R-1, Class R-2 and the Class R Certificates, will be designated as REMIC regular
interests. As REMIC regular interests, such certificates or components will
generally be treated as debt for federal income tax purposes. Certificateholders
will be required to include in income all interest and original issue discount
("OID") on such Certificates in accordance with the accrual method of accounting
regardless of the Certificateholders' usual methods of accounting. For federal
income tax purposes, (i) the Class R-1 Certificates will be the residual
interest in the Mortgage Trust, (ii) the Class R-2 Certificates will be the
residual interest in the First Level Certificate Trust and (iii) the Class R
Certificates will be the residual interest in the Certificate Trust.
 
                                      S-75
<PAGE>
    The Class IIA-2, Class IX, Class IP, Class IIX and Class IIP Certificates
will, and the Class IA-2, Class IIA-6 and Class B-1 Certificates may, be treated
as having been issued with OID for federal income tax purposes. The prepayment
assumption that will be used in determining the rate of accrual of market
discount and premium, if any, for federal income tax purposes is 260% of the
Basic Prepayment Assumption as described herein under "Yield and Prepayment
Considerations". No representation is made that the Mortgage Loans will prepay
at any given percentage of the Basic Prepayment Assumption.
 
    If actual prepayments differ sufficiently from the prepayment assumption,
the calculation of OID for certain Classes of Offered Certificates might produce
a negative number for certain accrual periods. In such event, Certificateholders
will not be entitled to a deduction for such amount, but will be required to
carry such amount forward as an offset to OID, if any, accruing in future
accrual periods.
 
    Purchasers of the Floater Certificates and Inverse Floater Certificates
should be aware that Section 1272(a)(6) of the Code and the OID Regulations do
not adequately address certain issues relevant to, or applicable to, prepayable
securities bearing a variable rate of interest such as the Floater Certificates
and Inverse Floater Certificates. In the absence of other authority, the REMIC
Administrator intends to be guided by certain principles of the OID Regulations
applicable to variable rate debt instruments in determining whether such
Certificates should be treated as issued with original issue discount and in
adapting the provisions of Section 1272(a)(6) of the Code to such Certificates
for the purpose of preparing reports furnished to Certificateholders and the
IRS. Because of the uncertainties concerning the application of Section
1272(a)(6) of the Code to such Certificates and because the rules relating to
debt instruments having a variable rate of interest are limited in their
application in ways that could preclude their application to such Certificates
even in the absence of Section 1272(a)(6) of the Code, the IRS could assert that
the Floater Certificates and Inverse Floater Certificates should be governed by
some other method not yet set forth in regulations. Prospective purchasers of
the Floater Certificates and Inverse Floater Certificates are advised to consult
their tax advisors concerning the tax treatment of such Certificates.
 
    The REMIC Administrator intends to report all income with respect to the
Inverse Floater Certificates as original issue discount for each period,
computing such original issue discount (i) by assuming that the value of the
applicable index will remain constant for purposes of determining the original
yield to maturity of each such class of Certificates and projecting future
distributions on such Certificates, thereby treating such Certificates as fixed
rate instruments to which the original issue discount computation rules
described in the Prospectus can be applied, and (ii) by accounting for any
positive or negative variation in the actual value of the applicable index in
any period from its assumed value as a current adjustment to original issue
discount with respect to such period. It appears that an approach similar to
that used to report income on the Inverse Floater Certificates would be a
reasonable application of the principles of the OID Regulations to the Floater
Certificates if such Certificates were deemed to have been issued with original
issue discount under the OID Regulations. See "Certain Federal Income Tax
Consequences -- Taxation of Owners of REMIC Regular Certificates -- Original
Issue Discount" in the Prospectus.
 
    Certain Classes of Certificates may be treated for federal income tax
purposes as having been issued at a premium. Whether any holder of a Certificate
will be treated as holding a Certificate with amortizable bond premium will
depend on such Certificateholder's purchase price and the distributions
remaining to be made on such Certificate at the time of its acquisition by such
Certificateholder. Holders of such Classes of Certificates should consult their
own tax advisors regarding the possibility of making an election to amortize any
such premium. See "Certain Federal Income Tax Consequences -- Taxation of Owners
of REMIC Regular Certificates -- Original Issue Discount" and "-- Market
Discount and Premium" in the Prospectus.
 
    The Offered Certificates will generally be treated as "qualifying real
property loans" for mutual savings banks and domestic building and loan
associations, "loans secured by an interest in real
 
                                      S-76
<PAGE>
property" for domestic building and loan associations, and "real estate assets"
for real estate investment trusts ("REITs") in the same proportion that the
assets in the REMICs would be so treated. In addition interest on the Offered
Certificates will generally be treated as "interest on obligations secured by
mortgages on real property" for REITs to the extent that such Offered
Certificates are treated as "real estate assets". Recently enacted legislation
repealed the provisions of Section 593(d) of the Internal Revenue Code allowing
the reserve method of accounting for bad debts, effective for taxable years
beginning after December 31, 1995. See "Certain Federal Income Tax Consequences"
in the Prospectus.
 
SPECIAL TAX CONSIDERATIONS APPLICABLE TO THE RESIDUAL CERTIFICATES
 
    The Internal Revenue Service has issued regulations under the provisions of
the Code related to REMICs (the "REMIC Regulations") that significantly affect
holders of the Residual Certificates. The REMIC Regulations impose restrictions
on the transfer or acquisition of certain residual interests, including the
Residual Certificates. In addition, the REMIC Regulations contain restrictions
that apply to: (1) thrift institutions holding residual interests lacking
"significant value" and (ii) the transfer of "noneconomic" residual interests to
United States persons. Pursuant to the Pooling Agreement, the Residual
Certificates may not be transferred to non-United States persons.
 
    The REMIC Regulations provide for the determination of whether a residual
interest has "significant value" for purposes of applying the rules relating to
"excess inclusions" with respect to residual interests. Based on the REMIC
Regulations, the Residual Certificates do not have significant value and,
accordingly, thrift institutions and their affiliates will be prevented from
using their unrelated losses or loss carryovers to offset any excess inclusions
with respect to the Residual Certificates, which will be in an amount equal to
all or virtually all of the taxable income includable by holders of the Residual
Certificates. See "Certain Federal Income Tax Consequences -- Taxation of Owners
of REMIC Residual Certificates -- Excess Inclusions" in the Prospectus.
 
    The REMIC Regulations also provide that a transfer to a United States person
of "noneconomic" residual interests will be disregarded for all federal income
tax purposes, and that the purported transferor of "noneconomic" residual
interests will continue to remain liable for any taxes due with respect to the
income on such residual interests, unless "no significant purpose of the
transfer was to impede the assessment or collection of tax". Based on the REMIC
Regulations, the Residual Certificates may constitute noneconomic residual
interests during some or all of their terms for purposes of the REMIC
Regulations and, accordingly, unless no significant purpose of a transfer is to
impede the assessment or collection of tax, transfers of the Residual
Certificates may be disregarded and purported transferors may remain liable for
any taxes due with respect to the income on the Residual Certificates. All
transfers of the Residual Certificates will be subject to certain restrictions
under the terms of the Pooling Agreement that are intended to reduce the
possibility of any such transfer being disregarded to the extent that the
Residual Certificates constitute noneconomic residual interests. See "Certain
Federal Income Tax Consequences -- Taxation of Owners of REMIC Residual
Certificates -- Noneconomic REMIC Residual Certificates" in the Prospectus.
 
    Recently enacted legislation made certain changes to the treatment of
residual interests in REMICs. In particular, such legislation: (i) repeals the
special rules for residual interests having "significant value" held by thrift
institutions, and (ii) provides that (A) excess inclusions will not be permitted
to be offset by the alternative tax net operating loss deduction and (B)
alternative minimum taxable income may not be less than the taxpayer's excess
inclusions. An effect of the last rule is to prevent nonrefundable tax credits
from reducing the taxpayer's income tax to an amount lower than the tentative
minimum tax on excess inclusions.
 
    The Class R and Class R-2 Certificateholders may be required to report an
amount of taxable income with respect to the earlier accrual periods of the
related REMIC's term that significantly exceeds the amount of cash distributions
received by such Class R and Class R-2 Certificateholders from the related REMIC
with respect to such periods. Consequently, the Class R or Class R-2
Certificateholders should have other sources of funds sufficient to pay any
federal income taxes due in the
 
                                      S-77
<PAGE>
earlier years of the related REMIC as a result of their ownership of such Class
R or Class R-2 Certificates. In addition, the required inclusion of this amount
of taxable income during the related REMIC's earlier accrual periods and the
deferral of corresponding tax losses or deductions until later accrual periods
or until the ultimate sale or disposition of a Class R or Class R-2 Certificate
(or possibly later under the "wash sale" rules of Section 1091 of the Code) may
cause the Class R or Class R-2 Certificateholders' after-tax rate of return to
be zero or negative even if the Class R or Class R-2 Certificateholders' pre-tax
rate of return is positive. That is, on a present value basis, the Class R or
Class R-2 Certificateholders' resulting tax liabilities could substantially
exceed the sum of any tax benefits and the amount of any cash distributions on
such Class R or Class R-2 Certificates over their life.
 
    As discussed above, the rules for accrual of original issue discount with
respect to certain Classes of Certificates are subject to significant complexity
and uncertainty. Because original issue discount on the Certificates will be
deducted by the related REMIC in determining its taxable income, any changes
required by the Internal Revenue Service in the application of those rules to
the Certificates may significantly affect the timing of original issue discount
deductions to the related REMIC and therefore the amount of the related REMIC's
taxable income allocable to holders of the Residual Certificates.
 
    Purchasers of the Residual Certificates are strongly advised to consult
their own tax advisors as to the economic and tax consequences of investment in
such Certificates.
 
    For further information regarding the federal income tax consequences of
investing in the Residual Certificates, see "Certain Yield and Prepayment
Considerations -- Additional Yield Considerations Applicable Solely to the
Residual Certificates" herein and "Certain Federal Income Tax Consequences --
Taxation of Owners of REMIC Residual Certificates" in the Prospectus.
 
    An individual, trust or estate that holds (whether directly or indirectly
through certain pass-through entities) a Residual Certificate, particularly a
Class R-1 Certificate, may have significant additional gross income with respect
to, but may be subject to limitations on the deductibility of, servicing and
trustee's fees and other administrative expenses properly allocable to the
related REMIC in computing such Certificateholder's regular tax liability and
will not be able to deduct such fees or expenses to any extent in computing such
Certificateholder's alternative minimum tax liability. Such expenses will be
allocated for federal income tax information reporting purposes entirely to the
Class R-1 Certificates and not to the Class R or Class R-2 Certificates.
However, it is possible that the IRS may require all or some portion of such
fees and expenses to be allocated to the Class R or Class R-2 Certificates. See
"Certain Federal Income Tax Consequences -- Pass-Through of Servicing Fees" and
" -- Taxation of Owners of REMIC Residual Certificates" in the Prospectus.
 
    The Company will be designated as the "tax matters persons" with respect to
the Trust as defined in the REMIC Regulations (defined below), and in connection
therewith will be required to hold not less than 0.01% of the Class R, Class R-1
and Class R-2 Certificates.
 
    For further information regarding the federal income tax consequences of
investing in the Certificates, see "Certain Federal Income Tax Consequences" in
the Prospectus.
 
                        CERTAIN LEGAL INVESTMENT ASPECTS
 
    As of the date of their issuance, the Offered Certificates, other than the
Class B-2 and Class B-3 Certificates, will constitute "mortgage related
securities" for purposes of the Secondary Mortgage Market Enhancement Act of
1984 ("SMMEA"), and as such will be legal investments for persons, trusts,
corporations, partnerships, associations, business trusts and business entities
(including depository institutions, life insurance companies, and pension funds)
created pursuant to or existing under the laws of the United States or of any
state whose authorized investments are subject to state regulation to the same
extent that, under applicable law, obligations issued by or guaranteed as to
principal and interest by the United States or any agency or instrumentality
thereof constitute legal
 
                                      S-78
<PAGE>
investments for such entities. Under SMMEA, if a state enacted legislation prior
to October 4, 1991 specifically limiting the legal investment authority of any
of such entities with respect to "mortgage related securities", the Offered
Certificates, other than the Class B-2 and Class B-3 Certificates, will
constitute legal investments for entities subject to such legislation only to
the extent provided therein. Certain states have enacted such legislation.
Investors should consult their own legal advisors in determining whether and to
what extent the Offered Certificates, constitute legal investments for such
investors.
 
    SMMEA also amended the legal investment authority of federally-chartered
depository institutions as follows: federal savings and loan associations and
federal savings banks may invest in, sell or otherwise deal with the Offered
Certificates, other than the Class B-2 and Class B-3 Certificates, without
limitation as to the percentage of their assets represented thereby, federal
credit unions may invest in the Offered Certificates, other than the Class B-2
and Class B-3 Certificates, and national banks may purchase the Offered
Certificates, other than the Class B-2 and Class B-3 Certificates, for their own
accounts without regard to the limitations generally applicable to investment
securities set forth in 12 U.S.C. 24 (Seventh), in each case subject to such
regulations as the applicable federal regulatory authority may prescribe.
 
    Institutions whose investment activities are subject to review by certain
regulatory authorities hereafter may be or may become subject to restrictions on
investment in the Offered Certificates, and such restrictions may be
retroactively imposed. The Federal Financial Institutions Examination Council,
the Federal Deposit Insurance Corporation, the Office of the Comptroller of the
Currency, the Board of Governors of the Federal Reserve System, the Office of
Thrift Supervision and the National Credit Union Administration have adopted
guidelines, and have proposed policies, regarding the suitability of investments
in various types of derivative mortgage-backed securities, including securities
such as the Offered Certificates. In addition, several states have adopted or
are considering regulations that would prohibit regulated institutions subject
to their jurisdiction from holding mortgage-backed securities such as the
Offered Certificates, including such securities previously purchased. Investors
should consult their own legal advisors in determining whether and to what
extent the Offered Certificates constitute legal investments for such investors.
 
    There may be other restrictions on the ability of certain investors,
including depository institutions, either to purchase the Offered Certificates
or to purchase the Offered Certificates representing more than a specified
percentage of the investor's assets. Investors should consult their own legal
advisors in determining whether and to what extent the Offered Certificates
constitute legal investments for such investors.
 
                              ERISA CONSIDERATIONS
 
    Any fiduciary of an employee benefit plan or other benefit plan or
arrangement which is subject to 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") (each, a "Plan"), or other person that proposes to
use "plan assets" of any Plan to acquire any Offered Certificates should consult
with its counsel with respect to the potential consequences under ERISA and
Section 4975 of the Code of the acquisition and ownership of such Certificates
by, on behalf of or with "plan assets" of any Plan. See "ERISA Considerations"
in the Prospectus.
 
UNDERWRITER'S PTE
 
    Donaldson, Lufkin & Jenrette Securities Corporation (the "Underwriter") is
the recipient of a final prohibited transaction exemption (the "Underwriter's
PTE") which may afford protection from violations under Sections 406 and 407 of
ERISA and Section 4975 of the Code for Plans that acquire
 
                                      S-79
<PAGE>
Offered Certificates (other than the Senior Subordinate Certificates). It is not
clear whether exemptive relief is available under the Underwriter's PTE for
Plans that acquire the Residual Certificates. Plans (or persons using "plan
assets" of any Plan) that acquire Offered Certificates (other than the Senior
Subordinate Certificates) may be eligible for exemptive relief under the
Underwriter's PTE if:
 
        (a) The Class of such Certificates acquired by the Plan is not
    subordinated to other Classes of Certificates with respect to the right to
    receive payment in the event of defaults or delinquencies on the underlying
    Mortgage Loans;
 
        (b) The Plan is an "accredited investor" (as defined in Rule 501(a)(1)
    of Regulation D under the Securities Act of 1933, as amended (the "Act"));
 
        (c) The acquisition of such Certificates by the Plan is on terms
    (including the price paid for the Certificates) that are at least as
    favorable to the Plan as they would be in an arm's length transaction with
    an unrelated party; and
 
        (d) The sum of all payments made to and retained by the Underwriter in
    connection with the distribution of such Certificates represents not more
    than reasonable compensation for underwriting such Certificates; the sum of
    all payments made to and retained by the Company pursuant to the sale of the
    Mortgage Loans to the Mortgage Trust represents not more than the fair
    market value of the Mortgage Loans; and the sum of all payments made to and
    retained by the Company or any other servicer represents not more than
    reasonable compensation for their services under the Pooling Agreement and
    reimbursement of their reasonable expenses in connection therewith.
 
    In addition, the Underwriter's PTE will not provide exemptive relief for
certain transactions prohibited by Section 406(b) of ERISA or Section
4975(c)(1)(E) or (F) of the Code that may result from an investment of "plan
assets" of any Plan in such Certificates if:
 
        (e) The Plan's investment in any Class of such Certificates exceeds 25%
    of the outstanding Certificates of that Class at the time of acquisition;
 
        (f) 25% or more of the Plan assets with respect to which the investing
    fiduciary has discretionary authority or renders investment advice are
    invested in certificates evidencing interests in trusts sponsored or
    containing assets sold or serviced by the Company;
 
        (g) The Plan is sponsored by the Company, the Underwriter, the Trustee,
    any servicer, the obligor under any credit support mechanism, or any
    mortgagor with respect to Mortgage Loans constituting more than 5% of the
    aggregate unamortized principal balance of the Mortgage Loans on the Closing
    Date (a "Major Obligor") or their affiliates; or
 
        (h) The Plan fiduciary responsible for the decision to invest or any of
    its affiliates is a Major Obligor.
 
    Whether the conditions of the Underwriter's PTE will be satisfied with
respect to Offered Certificates of a particular Class (other than the Senior
Subordinate Certificates, for which the Underwriter's PTE will not afford
exemptive relief) will depend upon the facts and circumstances existing at the
time the Plan acquires (or "plan assets" of the Plan are used to acquire)
Certificates of that Class. Any Plan fiduciary or other person that proposes to
use "plan assets" of any Plan to acquire such Offered Certificates in reliance
upon the Underwriter's PTE should determine whether such acquisition will
satisfy all applicable conditions and consult with its counsel regarding other
factors that may affect the applicability of the Underwriter's PTE.
 
PROHIBITED TRANSACTION CLASS EXEMPTIONS
 
    To qualify for exemption under PTCE 83-1 (see "ERISA Considerations --
Prohibited Transaction Class Exemption 83-1" in the Prospectus), a Certificate
(i) must entitle its holder to more than nominal pass-through payments of both
principal and interest from the Mortgage Loans, (ii) must not be subordinated to
other Classes of Certificates with respect to the right to receive payments in
the
 
                                      S-80
<PAGE>
event of defaults or delinquencies on the underlying Mortgage Loans and (iii)
must not be issued by a Trust which holds cooperative apartment Mortgage Loans.
See "ERISA Considerations -- Prohibited Transaction Class Exemption 83-1" in the
Prospectus.
 
    Because the Mortgage Trust will hold cooperative apartment Mortgage Loans,
PTCE 83-1 will not afford exemptive relief to Plans (or persons using "plan
assets" of any Plan) that acquire Offered Certificates from the prohibited
transaction rules of ERISA or Section 4975 of the Code. Purchasers using
insurance company general account assets to effect the purchase of the Senior
Subordinate Certificates should consider the availability of exemptive relief
under Section III of PTCE 95-60. See "ERISA Considerations -- Prohibited
Transaction Class Exemption 83-1" and " -- Other Exemptions" in the Prospectus.
 
RESTRICTIONS ON SENIOR SUBORDINATE AND RESIDUAL CERTIFICATES
 
    Because the Senior Subordinate Certificates will not qualify for exemptive
relief under the Underwriter's PTE or PTCE 83-1, and because it is not clear
whether the Residual Certificates may qualify for exemptive relief under the
Underwriter's PTE, purchases of such Certificates by, on behalf of or with "plan
assets" of any Plan will not to be registered unless the transferee (i) provides
an opinion of counsel satisfactory to the Trustee and the Company that the
purchase of any such Certificate by, on behalf of or with "plan assets" of such
Plan is permissible under applicable law, will not constitute or result in a
non-exempt prohibited transaction under ERISA or Section 4975 of the Code, and
will not subject the Master Servicer, the Company or the Trustee to any
obligation in addition to those undertaken in the Pooling Agreement or (ii)
represents that it is an insurance company using assets of its general account
to effect such purchase in reliance upon the availability of exemptive relief
under Section III of PTCE 95-60. See "ERISA Considerations" in the Prospectus.
 
                             METHOD OF DISTRIBUTION
 
    Subject to the terms and conditions set forth in the Underwriting Agreement,
the Company has agreed to sell to the Underwriter, and the Underwriter has
agreed to purchase, all of the Offered Certificates, other than the 0.01%
Percentage Interest in each of the Class R, Class R-1 and Class R-2 Certificates
to be retained by the Company. The aggregate proceeds (excluding accrued
interest) to the Company from the sale of the Offered Certificates, before
deducting expenses estimated to be $225,000, will be approximately 101.656% of
the initial aggregate Certificate Principal Balance of the Offered Certificates.
Under the terms and conditions of the Underwriting Agreement, the Underwriter is
committed to take and pay for all of such Offered Certificates, if any are
taken. Distribution of such Offered Certificates will be made by the Underwriter
from time to time in negotiated transactions or otherwise at varying prices to
be determined at the time of sale. The difference between the purchase price for
the Offered Certificates paid to the Company and the proceeds from the sale of
such Certificates realized by the Underwriter will constitute underwriting
discounts and commissions.
 
    The Company has agreed to indemnify the Underwriter against certain civil
liabilities, including liabilities under the Act.
 
                                 LEGAL MATTERS
 
    Certain legal matters will be passed upon for the Company by Thomas G.
Lehmann, General Counsel, Vice President and Secretary of the Company, and by
its special counsel, Orrick, Herrington & Sutcliffe LLP, San Francisco,
California. Brown & Wood LLP, New York, New York, will pass upon certain legal
matters on behalf of the Underwriter.
 
                              CERTIFICATE RATINGS
 
    It is a condition to the issuance of the Certificates that the Senior
Certificates be rated "Aaa" by Moody's Investors Service ("Moody's") and "AAA"
by Duff & Phelps Credit Rating Co. ("DCR") and that the Class B-1 Certificates
be rated not less than "Aa2" by Moody's and "AA" by DCR, the
 
                                      S-81
<PAGE>
Class B-2 Certificates be rated not less than "A2" by Moody's and "A" by DCR and
the Class B-3 Certificates be rated not less than "Baa2" by Moody's and "BBB" by
DCR. A security rating is not a recommendation to buy, sell or hold securities
and may be subject to revision or withdrawal at any time by the assigning Rating
Agency. Each security rating should be evaluated independently of any other
security rating.
 
    The ratings on the Offered Certificates address the likelihood of the
receipt by Certificateholders of all distributions with respect to the
underlying Mortgage Loans to which they are entitled. The ratings do not
represent any assessment of the likelihood that the rate of Principal
Prepayments by Mortgagors might differ from those originally anticipated. As a
result of such differences in the rate of Principal Prepayments,
Certificateholders might suffer a lower than anticipated yield to maturity. See
"Risk Factors" and "Yield and Prepayment Considerations" herein.
 
    DCR's ratings reflect its analysis of the riskiness of the Mortgage Loans
and its analysis of the structure of the transaction as set forth in the
operative documents. DCR's ratings do not address the effect on the
Certificates' yield attributable to prepayments or recoveries on the underlying
Mortgage Loans. Further, in the case of the Class X and Class IIA-2
Certificates, the rating does not address whether investors will recoup the
purchase price of such Certificates. Additionally, the rating on the Residual
Certificates addresses only the return of their Principal Balances and interest
thereon at their stated rate.
 
                                      S-82
<PAGE>
                                                                     APPENDIX A+
 
             PERCENT OF INITIAL CLASS PRINCIPAL BALANCE OUTSTANDING
           AT VARIOUS PERCENTAGES OF THE BASIC PREPAYMENT ASSUMPTION
<TABLE>
<CAPTION>
                                                                           CLASS IA-1                                   CLASS IA-2
<S>                                       <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                          ----------------------------------------------------------------------------  -----------
 
<CAPTION>
DISTRIBUTION DATE                             0%          100%         225%         260%         325%         445%          0%
- ----------------------------------------  ----------------------------------------------------------------------------  -----------
<S>                                       <C>          <C>          <C>          <C>          <C>          <C>          <C>
December 27, 1996.......................         100          100          100          100          100          100          100
December 25, 1997.......................          95           91           85           84           81           76          100
December 25, 1998.......................          90           79           66           62           56           44          100
December 25, 1999.......................          84           67           47           42           33           19          100
December 25, 2000.......................          77           55           32           26           16            1          100
December 25, 2001.......................          71           44           19           13            3            0          100
December 25, 2002.......................          63           35            9            3            0            0          100
December 25, 2003.......................          56           26            1            0            0            0          100
December 25, 2004.......................          47           18            0            0            0            0          100
December 25, 2005.......................          38           10            0            0            0            0          100
December 25, 2006.......................          28            3            0            0            0            0          100
December 25, 2007.......................          17            0            0            0            0            0          100
December 25, 2008.......................           6            0            0            0            0            0          100
December 25, 2009.......................           0            0            0            0            0            0           72
December 25, 2010.......................           0            0            0            0            0            0           17
December 25, 2011.......................           0            0            0            0            0            0            0
December 25, 2012.......................           0            0            0            0            0            0            0
December 25, 2013.......................           0            0            0            0            0            0            0
December 25, 2014.......................           0            0            0            0            0            0            0
December 25, 2015.......................           0            0            0            0            0            0            0
December 25, 2016.......................           0            0            0            0            0            0            0
December 25, 2017.......................           0            0            0            0            0            0            0
December 25, 2018.......................           0            0            0            0            0            0            0
December 25, 2019.......................           0            0            0            0            0            0            0
December 25, 2020.......................           0            0            0            0            0            0            0
December 25, 2021.......................           0            0            0            0            0            0            0
December 25, 2022.......................           0            0            0            0            0            0            0
December 25, 2023.......................           0            0            0            0            0            0            0
December 25, 2024.......................           0            0            0            0            0            0            0
December 25, 2025.......................           0            0            0            0            0            0            0
December 25, 2026.......................           0            0            0            0            0            0            0
Weighted Average Life (Years) (1).......         7.2          4.8          3.1          2.8          2.4          1.9         13.4
 
<CAPTION>
                                                                                                                  CLASS IA-3
<S>                                       <C>          <C>          <C>          <C>
                                                                                                           ------------------------
DISTRIBUTION DATE                            100%         225%         260%         325%         445%          0%          100%
- ----------------------------------------                                                                   ------------------------
<S>                                       <C>          <C>          <C>          <C>
December 27, 1996.......................         100          100          100          100          100          100          100
December 25, 1997.......................         100          100          100          100          100           96           96
December 25, 1998.......................         100          100          100          100          100           92           92
December 25, 1999.......................         100          100          100          100          100           87           87
December 25, 2000.......................         100          100          100          100          100           82           82
December 25, 2001.......................         100          100          100          100           54           76           76
December 25, 2002.......................         100          100          100           76           26           70           69
December 25, 2003.......................         100          100           82           50           10           64           61
December 25, 2004.......................         100           78           60           33            2           57           53
December 25, 2005.......................         100           58           43           22            *           50           44
December 25, 2006.......................         100           42           30           15            *           42           35
December 25, 2007.......................          83           29           20            9            *           33           26
December 25, 2008.......................          56           18           12            5            *           24           17
December 25, 2009.......................          31            9            6            3            *           14           10
December 25, 2010.......................           7            2            1            *            *            3            2
December 25, 2011.......................           0            0            0            0            0            0            0
December 25, 2012.......................           0            0            0            0            0            0            0
December 25, 2013.......................           0            0            0            0            0            0            0
December 25, 2014.......................           0            0            0            0            0            0            0
December 25, 2015.......................           0            0            0            0            0            0            0
December 25, 2016.......................           0            0            0            0            0            0            0
December 25, 2017.......................           0            0            0            0            0            0            0
December 25, 2018.......................           0            0            0            0            0            0            0
December 25, 2019.......................           0            0            0            0            0            0            0
December 25, 2020.......................           0            0            0            0            0            0            0
December 25, 2021.......................           0            0            0            0            0            0            0
December 25, 2022.......................           0            0            0            0            0            0            0
December 25, 2023.......................           0            0            0            0            0            0            0
December 25, 2024.......................           0            0            0            0            0            0            0
December 25, 2025.......................           0            0            0            0            0            0            0
December 25, 2026.......................           0            0            0            0            0            0            0
Weighted Average Life (Years) (1).......        12.3          9.9          9.1          7.7          5.4          8.4          8.0
 
<CAPTION>
 
DISTRIBUTION DATE                            225%         260%         325%         445%
- ----------------------------------------
December 27, 1996.......................         100          100          100          100
December 25, 1997.......................          96           96           96           96
December 25, 1998.......................          92           92           92           92
December 25, 1999.......................          87           87           87           87
December 25, 2000.......................          82           82           82           82
December 25, 2001.......................          76           76           76           76
December 25, 2002.......................          68           67           66           64
December 25, 2003.......................          58           57           55           52
December 25, 2004.......................          47           46           43           38
December 25, 2005.......................          37           35           32           26
December 25, 2006.......................          27           25           21           16
December 25, 2007.......................          18           17           14            9
December 25, 2008.......................          11           10            8            5
December 25, 2009.......................           6            5            4            2
December 25, 2010.......................           1            1            1            *
December 25, 2011.......................           0            0            0            0
December 25, 2012.......................           0            0            0            0
December 25, 2013.......................           0            0            0            0
December 25, 2014.......................           0            0            0            0
December 25, 2015.......................           0            0            0            0
December 25, 2016.......................           0            0            0            0
December 25, 2017.......................           0            0            0            0
December 25, 2018.......................           0            0            0            0
December 25, 2019.......................           0            0            0            0
December 25, 2020.......................           0            0            0            0
December 25, 2021.......................           0            0            0            0
December 25, 2022.......................           0            0            0            0
December 25, 2023.......................           0            0            0            0
December 25, 2024.......................           0            0            0            0
December 25, 2025.......................           0            0            0            0
December 25, 2026.......................           0            0            0            0
Weighted Average Life (Years) (1).......         7.6          7.5          7.3          7.0
</TABLE>
 
- ----------------------------------
 +  This table has been prepared based on the assumptions described herein under
    "Yield and Prepayment Considerations -- General" (including the assumptions
    regarding the characteristics and performance of the Mortgage Loans which
    differ from the actual characteristics and performance thereof) and should
    be read in conjunction therewith.
 
 *  Indicates an amount above zero and less than 0.5% of original principal
    balance outstanding.
 
(1) The weighted average life of any Class of Certificates is determined by (i)
    multiplying the amount of each assumed principal distribution on such Class
    of Certificates by the number of years from the date of issuance of the
    Certificates to the related Distribution Date, (ii) summing the results, and
    (iii) dividing the sum by the total amount of principal distributed on such
    Class of Certificates.
 
                                      S-83
<PAGE>
             PERCENT OF INITIAL CLASS PRINCIPAL BALANCE OUTSTANDING
           AT VARIOUS PERCENTAGES OF THE BASIC PREPAYMENT ASSUMPTION
<TABLE>
<CAPTION>
                                                       CLASS IIA-1 AND IIA-2                                    CLASS IIA-3
<S>                         <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>
                            ----------------------------------------------------------------------------  ------------------------
 
<CAPTION>
DISTRIBUTION DATE               0%          100%         225%         260%         325%         445%          0%          100%
- --------------------------  ----------------------------------------------------------------------------  ------------------------
<S>                         <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>
December 27, 1996.........         100          100          100          100          100          100          100          100
December 25, 1997.........          99           97           94           93           92           89          100          100
December 25, 1998.........          98           91           82           79           75           67          100          100
December 25, 1999.........          97           83           66           62           54           41          100          100
December 25, 2000.........          96           75           52           47           37           22          100          100
December 25, 2001.........          94           68           41           34           24            9          100          100
December 25, 2002.........          93           61           31           25           14            4          100          100
December 25, 2003.........          92           55           24           17            9            1          100          100
December 25, 2004.........          90           50           18           11            6            0          100          100
December 25, 2005.........          88           45           13            9            4            0          100          100
December 25, 2006.........          86           41           10            7            2            0          100          100
December 25, 2007.........          84           36            8            5            1            0          100          100
December 25, 2008.........          82           33            6            4            *            0          100          100
December 25, 2009.........          80           29            5            3            0            0          100          100
December 25, 2010.........          77           25            4            2            0            0          100          100
December 25, 2011.........          75           22            3            1            0            0          100          100
December 25, 2012.........          71           19            2            *            0            0          100          100
December 25, 2013.........          68           16            1            0            0            0          100          100
December 25, 2014.........          65           13            *            0            0            0          100          100
December 25, 2015.........          61           11            0            0            0            0          100           97
December 25, 2016.........          56            9            0            0            0            0          100           83
December 25, 2017.........          52            8            0            0            0            0          100           69
December 25, 2018.........          47            6            0            0            0            0          100           57
December 25, 2019.........          41            5            0            0            0            0          100           45
December 25, 2020.........          35            4            0            0            0            0          100           33
December 25, 2021.........          29            2            0            0            0            0          100           22
December 25, 2022.........          22            1            0            0            0            0          100           12
December 25, 2023.........          14            *            0            0            0            0          100            2
December 25, 2024.........           8            0            0            0            0            0           70            0
December 25, 2025.........           2            0            0            0            0            0           20            0
December 25, 2026.........           0            0            0            0            0            0            0            0
Weighted Average Life
 (Years) (1)..............        19.5          9.6          5.1          4.5          3.7          2.8         28.4         22.7
 
<CAPTION>
                                                                                                   CLASS IIA-4
<S>                         <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>
                                                                                --------------------------------------------------
DISTRIBUTION DATE              225%         260%         325%         445%          0%          100%         225%         260%
- --------------------------                                                      --------------------------------------------------
<S>                         <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>
December 27, 1996.........         100          100          100          100          100          100          100          100
December 25, 1997.........         100          100          100          100          100          100          100          100
December 25, 1998.........         100          100          100          100          100          100          100          100
December 25, 1999.........         100          100          100          100          100          100          100          100
December 25, 2000.........         100          100          100          100          100          100          100          100
December 25, 2001.........         100          100          100           81          100          100          100          100
December 25, 2002.........         100          100          100           35          100          100          100          100
December 25, 2003.........         100          100           78            6          100          100          100          100
December 25, 2004.........         100          100           51            0          100          100          100          100
December 25, 2005.........         100           79           33            0          100          100          100          100
December 25, 2006.........          90           61           21            0          100          100          100          100
December 25, 2007.........          73           46           11            0          100          100          100          100
December 25, 2008.........          58           34            3            0          100          100          100          100
December 25, 2009.........          45           23            0            0          100          100          100          100
December 25, 2010.........          34           15            0            0          100          100          100          100
December 25, 2011.........          24            8            0            0          100          100          100          100
December 25, 2012.........          16            2            0            0          100          100          100          100
December 25, 2013.........           9            0            0            0          100          100          100           86
December 25, 2014.........           3            0            0            0          100          100          100           69
December 25, 2015.........           0            0            0            0          100          100           93           56
December 25, 2016.........           0            0            0            0          100          100           76           44
December 25, 2017.........           0            0            0            0          100          100           61           35
December 25, 2018.........           0            0            0            0          100          100           49           27
December 25, 2019.........           0            0            0            0          100          100           38           21
December 25, 2020.........           0            0            0            0          100          100           29           15
December 25, 2021.........           0            0            0            0          100          100           22           11
December 25, 2022.........           0            0            0            0          100          100           16            8
December 25, 2023.........           0            0            0            0          100          100           10            5
December 25, 2024.........           0            0            0            0          100           68            6            3
December 25, 2025.........           0            0            0            0          100           30            2            1
December 25, 2026.........           0            0            0            0            0            0            0            0
Weighted Average Life
 (Years) (1)..............        13.1         11.2          8.5          5.8         29.6         28.5         22.6         20.4
 
<CAPTION>
                                                                                      CLASS IIA-5
                                                      ----------------------------------------------------------------------------
 
DISTRIBUTION DATE              325%         445%          0%          100%         225%         260%         325%         445%
 
- --------------------------                            ----------------------------------------------------------------------------
 
December 27, 1996.........         100          100          100          100          100          100          100          100
 
December 25, 1997.........         100          100          100          100          100          100          100          100
 
December 25, 1998.........         100          100          100          100          100          100          100          100
 
December 25, 1999.........         100          100          100          100          100          100          100          100
 
December 25, 2000.........         100          100          100          100          100          100          100          100
 
December 25, 2001.........         100          100          100          100          100          100          100          100
 
December 25, 2002.........         100          100           99           97           95           94           93           90
 
December 25, 2003.........         100          100           97           93           88           87           84           79
 
December 25, 2004.........         100           59           96           89           80           77           72           64
 
December 25, 2005.........         100           31           94           83           70           66           60           49
 
December 25, 2006.........         100           22           93           76           59           55           47           35
 
December 25, 2007.........         100           16           91           70           50           45           37           25
 
December 25, 2008.........         100           11           89           65           42           37           29           18
 
December 25, 2009.........          89            8           86           59           36           31           23           13
 
December 25, 2010.........          70            6           84           54           30           25           18            9
 
December 25, 2011.........          55            4           81           49           25           21           14            7
 
December 25, 2012.........          42            3           79           45           21           17           11            5
 
December 25, 2013.........          33            2           75           40           17           14            8            3
 
December 25, 2014.........          25            1           72           36           14           11            6            2
 
December 25, 2015.........          19            1           68           32           12            9            5            2
 
December 25, 2016.........          15            1           64           29           10            7            4            1
 
December 25, 2017.........          11            *           60           25            8            5            3            1
 
December 25, 2018.........           8            *           55           22            6            4            2            1
 
December 25, 2019.........           6            *           50           18            5            3            2            *
 
December 25, 2020.........           4            *           44           15            4            2            1            *
 
December 25, 2021.........           3            *           38           12            3            2            1            *
 
December 25, 2022.........           2            *           32           10            2            1            1            *
 
December 25, 2023.........           1            *           24            7            1            1            *            *
 
December 25, 2024.........           1            *           16            4            1            *            *            *
 
December 25, 2025.........           *            *            8            2            *            *            *            *
 
December 25, 2026.........           0            0            0            0            0            0            0            0
 
Weighted Average Life
 (Years) (1)..............        16.4          9.2         21.5         15.9         12.3         11.7         10.7          9.6
 
</TABLE>
 
- ----------------------------------
 *  Indicates an amount above zero and less than 0.5% of original principal
    balance outstanding.
 
(1) The weighted average life of any Class of Certificates is determined by (i)
    multiplying the amount of each assumed principal distribution on such Class
    of Certificates by the number of years from the date of issuance of the
    Certificates to the related Distribution Date, (ii) summing the results, and
    (iii) dividing the sum by the total amount of principal distributed on such
    Class of Certificates.
 
                                      S-84
<PAGE>
             PERCENT OF INITIAL CLASS PRINCIPAL BALANCE OUTSTANDING
           AT VARIOUS PERCENTAGES OF THE BASIC PREPAYMENT ASSUMPTION
<TABLE>
<CAPTION>
                                                        CLASS IIA-6 AND IIA-7                                    CLASS IP
<S>                           <C>        <C>          <C>          <C>          <C>          <C>          <C>        <C>
                              --------------------------------------------------------------------------  ----------------------
 
<CAPTION>
DISTRIBUTION DATE                0%         100%         225%         260%         325%         445%         0%         100%
- ----------------------------  --------------------------------------------------------------------------  ----------------------
<S>                           <C>        <C>          <C>          <C>          <C>          <C>          <C>        <C>
December 27, 1996...........        100         100          100          100          100          100         100         100
December 25, 1997...........         99          96           93           93           91           88          96          92
December 25, 1998...........         98          90           80           77           72           63          91          82
December 25, 1999...........         96          80           62           57           48           34          86          73
December 25, 2000...........         95          72           47           40           29           12          80          64
December 25, 2001...........         94          64           33           26           14            0          74          56
December 25, 2002...........         92          56           23           15            3            0          68          48
December 25, 2003...........         90          50           14            7            0            0          61          41
December 25, 2004...........         89          44            8            *            0            0          54          34
December 25, 2005...........         87          38            2            0            0            0          47          27
December 25, 2006...........         85          33            0            0            0            0          38          21
December 25, 2007...........         83          29            0            0            0            0          30          15
December 25, 2008...........         80          24            0            0            0            0          20          10
December 25, 2009...........         77          20            0            0            0            0          10           5
December 25, 2010...........         75          16            0            0            0            0           0           0
December 25, 2011...........         71          12            0            0            0            0           0           0
December 25, 2012...........         68           9            0            0            0            0           0           0
December 25, 2013...........         64           6            0            0            0            0           0           0
December 25, 2014...........         60           2            0            0            0            0           0           0
December 25, 2015...........         56           0            0            0            0            0           0           0
December 25, 2016...........         51           0            0            0            0            0           0           0
December 25, 2017...........         46           0            0            0            0            0           0           0
December 25, 2018...........         40           0            0            0            0            0           0           0
December 25, 2019...........         34           0            0            0            0            0           0           0
December 25, 2020...........         27           0            0            0            0            0           0           0
December 25, 2021...........         20           0            0            0            0            0           0           0
December 25, 2022...........         12           0            0            0            0            0           0           0
December 25, 2023...........          3           0            0            0            0            0           0           0
December 25, 2024...........          0           0            0            0            0            0           0           0
December 25, 2025...........          0           0            0            0            0            0           0           0
December 25, 2026...........          0           0            0            0            0            0           0           0
Weighted Average Life
 (Years) (1)................       18.5         7.9          4.2          3.7          3.1          2.5         8.1         6.2
 
<CAPTION>
 
<S>                           <C>          <C>          <C>          <C>
 
DISTRIBUTION DATE                225%         260%         325%         445%
- ----------------------------
<S>                           <C>          <C>          <C>          <C>
December 27, 1996...........         100          100          100          100
December 25, 1997...........          87           86           83           79
December 25, 1998...........          72           69           64           56
December 25, 1999...........          59           55           49           38
December 25, 2000...........          48           44           37           26
December 25, 2001...........          38           34           27           18
December 25, 2002...........          30           26           20           12
December 25, 2003...........          24           20           15            8
December 25, 2004...........          18           15           10            5
December 25, 2005...........          13           11            7            3
December 25, 2006...........          10            8            5            2
December 25, 2007...........           6            5            3            1
December 25, 2008...........           4            3            2            1
December 25, 2009...........           2            1            1            *
December 25, 2010...........           0            0            0            0
December 25, 2011...........           0            0            0            0
December 25, 2012...........           0            0            0            0
December 25, 2013...........           0            0            0            0
December 25, 2014...........           0            0            0            0
December 25, 2015...........           0            0            0            0
December 25, 2016...........           0            0            0            0
December 25, 2017...........           0            0            0            0
December 25, 2018...........           0            0            0            0
December 25, 2019...........           0            0            0            0
December 25, 2020...........           0            0            0            0
December 25, 2021...........           0            0            0            0
December 25, 2022...........           0            0            0            0
December 25, 2023...........           0            0            0            0
December 25, 2024...........           0            0            0            0
December 25, 2025...........           0            0            0            0
December 25, 2026...........           0            0            0            0
Weighted Average Life
 (Years) (1)................         4.6          4.3          3.8          3.0
</TABLE>
 
- ----------------------------------
 *  Indicates an amount above zero and less than 0.5% of original principal
    balance outstanding.
 
(1) The weighted average life of any Class of Certificates is determined by (i)
    multiplying the amount of each assumed principal distribution on such Class
    of Certificates by the number of years from the date of issuance of the
    Certificates to the related Distribution Date, (ii) summing the results, and
    (iii) dividing the sum by the total amount of principal distributed on such
    Class of Certificates.
 
                                      S-85
<PAGE>
             PERCENT OF INITIAL CLASS PRINCIPAL BALANCE OUTSTANDING
           AT VARIOUS PERCENTAGES OF THE BASIC PREPAYMENT ASSUMPTION
<TABLE>
<CAPTION>
                                                              CLASS IIP                                     CLASS R, R-1 & R-2
<S>                           <C>        <C>          <C>          <C>          <C>          <C>          <C>        <C>
                              --------------------------------------------------------------------------  ----------------------
 
<CAPTION>
DISTRIBUTION DATE                0%         100%         225%         260%         325%         445%         0%         100%
- ----------------------------  --------------------------------------------------------------------------  ----------------------
<S>                           <C>        <C>          <C>          <C>          <C>          <C>          <C>        <C>
December 27, 1996...........        100         100          100          100          100          100         100         100
December 25, 1997...........         99          97           95           95           94           92           0           0
December 25, 1998...........         98          93           86           84           80           74           0           0
December 25, 1999...........         97          86           74           70           64           54           0           0
December 25, 2000...........         96          80           63           59           51           39           0           0
December 25, 2001...........         95          74           54           49           41           28           0           0
December 25, 2002...........         94          69           46           41           32           21           0           0
December 25, 2003...........         92          64           39           34           26           15           0           0
December 25, 2004...........         91          59           33           28           20           11           0           0
December 25, 2005...........         89          55           28           23           16            8           0           0
December 25, 2006...........         88          50           24           19           13            6           0           0
December 25, 2007...........         86          46           20           16           10            4           0           0
December 25, 2008...........         84          43           17           13            8            3           0           0
December 25, 2009...........         82          39           14           11            6            2           0           0
December 25, 2010...........         79          36           12            9            5            1           0           0
December 25, 2011...........         77          32           10            7            4            1           0           0
December 25, 2012...........         74          29            8            6            3            1           0           0
December 25, 2013...........         71          26            7            5            2            1           0           0
December 25, 2014...........         67          24            6            4            2            *           0           0
December 25, 2015...........         64          21            5            3            1            *           0           0
December 25, 2016...........         60          19            4            2            1            *           0           0
December 25, 2017...........         56          16            3            2            1            *           0           0
December 25, 2018...........         51          14            2            1            1            *           0           0
December 25, 2019...........         46          12            2            1            *            *           0           0
December 25, 2020...........         41          10            1            1            *            *           0           0
December 25, 2021...........         35           8            1            1            *            *           0           0
December 25, 2022...........         29           6            1            *            *            *           0           0
December 25, 2023...........         22           4            1            *            *            *           0           0
December 25, 2024...........         15           3            *            *            *            *           0           0
December 25, 2025...........          7           1            *            *            *            *           0           0
December 25, 2026...........          0           0            0            0            0            0           0           0
Weighted Average Life
 (Years) (1)................       20.4        11.7          7.1          6.4          5.4          4.1         0.1         0.1
 
<CAPTION>
                                                                                                CLASS B-1, B-2 & B-3
<S>                           <C>          <C>
                                                                                  ------------------------------------------------
DISTRIBUTION DATE                225%         260%         325%         445%         0%         100%         225%         260%
- ----------------------------                                                      ------------------------------------------------
<S>                           <C>          <C>
December 27, 1996...........         100          100          100          100         100         100          100          100
December 25, 1997...........           0            0            0            0          98          98           98           98
December 25, 1998...........           0            0            0            0          96          96           96           96
December 25, 1999...........           0            0            0            0          94          94           94           94
December 25, 2000...........           0            0            0            0          92          92           92           92
December 25, 2001...........           0            0            0            0          89          89           89           89
December 25, 2002...........           0            0            0            0          87          85           83           82
December 25, 2003...........           0            0            0            0          84          80           76           74
December 25, 2004...........           0            0            0            0          81          74           67           65
December 25, 2005...........           0            0            0            0          77          68           57           54
December 25, 2006...........           0            0            0            0          74          61           47           44
December 25, 2007...........           0            0            0            0          70          54           38           35
December 25, 2008...........           0            0            0            0          65          48           31           28
December 25, 2009...........           0            0            0            0          61          42           25           22
December 25, 2010...........           0            0            0            0          56          36           20           17
December 25, 2011...........           0            0            0            0          53          32           16           13
December 25, 2012...........           0            0            0            0          51          29           14           11
December 25, 2013...........           0            0            0            0          49          26           11            9
December 25, 2014...........           0            0            0            0          47          24            9            7
December 25, 2015...........           0            0            0            0          44          21            8            6
December 25, 2016...........           0            0            0            0          42          19            6            5
December 25, 2017...........           0            0            0            0          39          16            5            4
December 25, 2018...........           0            0            0            0          36          14            4            3
December 25, 2019...........           0            0            0            0          33          12            3            2
December 25, 2020...........           0            0            0            0          29          10            2            2
December 25, 2021...........           0            0            0            0          25           8            2            1
December 25, 2022...........           0            0            0            0          21           6            1            1
December 25, 2023...........           0            0            0            0          16           5            1            1
December 25, 2024...........           0            0            0            0          11           3            *            *
December 25, 2025...........           0            0            0            0           5           1            *            *
December 25, 2026...........           0            0            0            0           0           0            0            0
Weighted Average Life
 (Years) (1)................         0.1          0.1          0.1          0.1        16.8        13.0         10.5         10.1
 
<CAPTION>
 
DISTRIBUTION DATE                325%         445%
- ----------------------------
December 27, 1996...........         100          100
December 25, 1997...........          98           98
December 25, 1998...........          96           96
December 25, 1999...........          94           94
December 25, 2000...........          92           92
December 25, 2001...........          89           89
December 25, 2002...........          81           79
December 25, 2003...........          72           68
December 25, 2004...........          61           54
December 25, 2005...........          49           40
December 25, 2006...........          38           28
December 25, 2007...........          29           20
December 25, 2008...........          22           13
December 25, 2009...........          16            9
December 25, 2010...........          12            6
December 25, 2011...........           9            4
December 25, 2012...........           7            3
December 25, 2013...........           5            2
December 25, 2014...........           4            1
December 25, 2015...........           3            1
December 25, 2016...........           2            1
December 25, 2017...........           2            *
December 25, 2018...........           1            *
December 25, 2019...........           1            *
December 25, 2020...........           1            *
December 25, 2021...........           *            *
December 25, 2022...........           *            *
December 25, 2023...........           *            *
December 25, 2024...........           *            *
December 25, 2025...........           *            *
December 25, 2026...........           0            0
Weighted Average Life
 (Years) (1)................         9.4          8.5
</TABLE>
 
- ----------------------------------
 *  Indicates an amount above zero and less than 0.5% of original principal
    balance outstanding.
 
(1) The weighted average life of any Class of Certificates is determined by (i)
    multiplying the amount of each assumed principal distribution on such Class
    of Certificates by the number of years from the date of issuance of the
    Certificates to the related Distribution Date, (ii) summing the results, and
    (iii) dividing the sum by the total amount of principal distributed on such
    Class of Certificates.
 
                                      S-86
<PAGE>
PROSPECTUS
                                  PNC MORTGAGE
                                SECURITIES CORP.
 
                       MORTGAGE PASS-THROUGH CERTIFICATES
                              (ISSUABLE IN SERIES)
                              -------------------
 
THESE CERTIFICATES DO NOT REPRESENT AN OBLIGATION OF OR INTEREST IN PNC MORTGAGE
  SECURITIES CORP. OR ANY OF ITS AFFILIATES, INCLUDING PNC BANK CORP. NEITHER
    THESE CERTIFICATES NOR THE UNDERLYING MORTGAGE LOANS ARE GUARANTEED BY
                   ANY AGENCY OR INSTRUMENTALITY OF THE UNITED STATES.
                              -------------------
 
    PNC  MORTGAGE SECURITIES CORP. (THE "COMPANY") MAY SELL FROM TIME TO TIME UP
TO  $3,000,000,000  AGGREGATE  AMOUNT   OF  CERTIFICATES  (THE   "CERTIFICATES")
EVIDENCING  UNDIVIDED INTERESTS IN ONE OR MORE  TRUSTS (EACH, A "TRUST FUND") TO
BE CREATED BY THE COMPANY FROM TIME TO TIME.
 
    THE CERTIFICATES WILL  BE ISSUABLE  IN SERIES  (EACH, A  "SERIES"), EACH  OF
WHICH  WILL  REPRESENT  UNDIVIDED  INTERESTS  IN  A  SINGLE  TRUST  FUND, UNLESS
OTHERWISE INDICATED IN  THE APPLICABLE  PROSPECTUS SUPPLEMENT.  THE PROPERTY  OF
EACH  TRUST FUND WILL  CONSIST EITHER OF  A POOL OF  MORTGAGE LOANS (A "MORTGAGE
POOL") SECURED  BY ONE-TO  FOUR-FAMILY  RESIDENTIAL PROPERTIES  OR  MULTI-FAMILY
RESIDENTIAL  PROPERTIES  (THE  "MORTGAGE  LOANS") WHICH  MORTGAGE  LOANS,  IF SO
SPECIFIED  IN  THE  RELATED  PROSPECTUS  SUPPLEMENT,  MAY  INCLUDE   COOPERATIVE
APARTMENT  LOANS  ("COOPERATIVE  LOANS"), AND  RELATED  PROPERTY  AND INTERESTS,
CONVEYED TO THE  TRUST FUND BY  THE COMPANY,  OR OF CERTIFICATES  WHICH IN  TURN
EVIDENCE  OWNERSHIP OF  A MORTGAGE POOL  AND RELATED  PROPERTY. UNLESS OTHERWISE
INDICATED IN THE RELATED PROSPECTUS SUPPLEMENT, EACH POOL WILL CONSIST  ENTIRELY
OF   FIXED-RATE  FIRST-LIEN  MORTGAGE  LOANS   OR  ENTIRELY  OF  ADJUSTABLE-RATE
FIRST-LIEN MORTGAGE LOANS  ACQUIRED BY THE  COMPANY FROM ONE  OR MORE  QUALIFIED
SELLERS.  INFORMATION REGARDING EACH SERIES  OF CERTIFICATES, INCLUDING THE RATE
OF INTEREST BORNE BY THE CERTIFICATES  (THE "REMITTANCE RATE") FOR SUCH  SERIES,
AS WELL AS INFORMATION REGARDING THE SIZE, COMPOSITION AND OTHER CHARACTERISTICS
OF  THE  POOL  RELATING  TO  SUCH SERIES,  WILL  BE  FURNISHED  IN  A PROSPECTUS
SUPPLEMENT AT THE TIME  SUCH SERIES IS OFFERED.  IF INDICATED IN THE  APPLICABLE
PROSPECTUS  SUPPLEMENT, CERTIFICATES  OF A  SERIES MAY  BE DIVIDED  INTO SEVERAL
CLASSES (EACH, A "CLASS"), WHICH EACH MAY BEAR DIFFERENT RATES OF INTEREST,  AND
THE  RIGHTS OF THE  HOLDERS OF CERTAIN  CLASSES MAY BE  SUBORDINATED TO THOSE OF
OTHER CLASSES, AS SPECIFIED IN THE APPLICABLE PROSPECTUS SUPPLEMENT.
 
    THE COMPANY WILL, WITH RESPECT TO EACH SERIES OF CERTIFICATES, ELECT TO HAVE
THE RELATED MORTGAGE POOL TREATED AS  A REAL ESTATE MORTGAGE INVESTMENT  CONDUIT
(A  "REMIC")  UNDER  APPLICABLE PROVISIONS  OF  THE INTERNAL  REVENUE  CODE. SEE
"CERTAIN FEDERAL INCOME TAX CONSEQUENCES".
 
    EXCEPT FOR CERTAIN REPRESENTATIONS AND  WARRANTIES, AND EXCEPT AS  OTHERWISE
STATED IN THE RELATED PROSPECTUS SUPPLEMENT, THE COMPANY'S SOLE OBLIGATIONS WITH
RESPECT  TO A  SERIES OF THE  CERTIFICATES ARE ITS  CONTRACTUAL SERVICING AND/OR
ADMINISTRATIVE RESPONSIBILITIES AND ITS  OBLIGATION (UNLESS OTHERWISE  SPECIFIED
IN  THE APPLICABLE PROSPECTUS SUPPLEMENT), IN THE EVENT OF PAYMENT DELINQUENCIES
ON MORTGAGE LOANS, TO MAKE CASH ADVANCES  WITH RESPECT THERETO IF IT DEEMS  SUCH
ADVANCES   TO  BE  RECOVERABLE  FROM  THE  PROCEEDS  OF  ANY  APPLICABLE  CREDIT
ENHANCEMENT INSTRUMENTS, LIQUIDATION PROCEEDS OR OTHERWISE.
 
    SEE "RISK FACTORS" IMMEDIATELY FOLLOWING "SUMMARY OF PROSPECTUS" HEREIN  FOR
A  DISCUSSION OF  CERTAIN FACTORS  THAT SHOULD  BE CONSIDERED  BEFORE PURCHASING
CERTIFICATES OF ANY SERIES.
                               -----------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES  AND
  EXCHANGE  COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE NOR HAS ANY
    SUCH COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
           ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                              -------------------
 
    OFFERS OF  THE  CERTIFICATES MAY  BE  MADE  THROUGH ONE  OR  MORE  DIFFERENT
METHODS, INCLUDING OFFERINGS THROUGH UNDERWRITERS, AS MORE FULLY DESCRIBED UNDER
"METHODS  OF DISTRIBUTION". THE CERTIFICATES FOR  EACH MORTGAGE POOL ARE OFFERED
WHEN, AS AND  IF ISSUED, SUBJECT  TO PRIOR SALE  OR WITHDRAWAL, CANCELLATION  OR
MODIFICATION OF THE OFFER WITHOUT NOTICE.
 
    THIS  PROSPECTUS MAY ALSO BE USED IN CONNECTION WITH RESALES OF CERTIFICATES
BY CERTAIN PURCHASERS THEREOF, INCLUDING DEALERS, WHO ARE OR MAY BE DEEMED TO BE
"UNDERWRITERS" WITHIN THE MEANING OF THE SECURITIES ACT OF 1933. SEE "METHODS OF
DISTRIBUTION" HEREIN. RE-OFFERS AND SALES OF CERTIFICATES BY PURCHASERS  THEREOF
ARE  EXPECTED TO BE MADE AT THEN PREVAILING MARKET PRICES, ALTHOUGH THERE CAN BE
NO ASSURANCE  THAT  A SECONDARY  MARKET  FOR  ANY SERIES  OF  CERTIFICATES  WILL
DEVELOP.
 
    RETAIN THIS PROSPECTUS FOR FUTURE REFERENCE.
 
    THIS  PROSPECTUS MAY NOT BE USED  TO CONSUMMATE SALES OF CERTIFICATES UNLESS
ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.
 
JUNE 25, 1996
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
CAPTION                                                                     PAGE
- --------------------------------------------------------------------------  ----
<S>                                                                         <C>
Summary of Prospectus.....................................................    3
Risk Factors..............................................................    9
The Mortgage Pools........................................................   10
Use of Proceeds...........................................................   14
Yield Considerations......................................................   14
Maturity, Average Life and Prepayment Assumptions.........................   16
The Company...............................................................   17
Description of Certificates...............................................   20
Primary Insurance, FHA Mortgage Insurance, VA Mortgage Guaranty, Hazard
 Insurance; Claims Thereunder.............................................   39
Description of Credit Enhancements........................................   44
Certain Legal Aspects of the Mortgage Loans...............................   52
ERISA Considerations......................................................   59
Certain Federal Income Tax Consequences...................................   62
Methods of Distribution...................................................   78
Transferability of Certificates...........................................   78
Legal Matters.............................................................   79
Financial Information.....................................................   79
Additional Information....................................................   79
Glossary..................................................................   80
</TABLE>
 
    UNTIL  90 DAYS  AFTER THE  DATE OF EACH  SUPPLEMENT TO  THIS PROSPECTUS, ALL
DEALERS EFFECTING  TRANSACTIONS IN  THE REGISTERED  SECURITIES COVERED  BY  SUCH
SUPPLEMENT,  WHETHER OR  NOT PARTICIPATING IN  THE DISTRIBUTION  THEREOF, MAY BE
REQUIRED TO DELIVER SUCH SUPPLEMENT AND THIS PROSPECTUS. THIS IS IN ADDITION  TO
THE  OBLIGATION OF DEALERS TO DELIVER A SUPPLEMENT AND PROSPECTUS WHEN ACTING AS
UNDERWRITERS OF SECURITIES COVERED BY SUCH SUPPLEMENT AND WITH RESPECT TO  THEIR
UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
 
    NO  PERSON  HAS BEEN  AUTHORIZED  TO GIVE  ANY  INFORMATION OR  TO  MAKE ANY
REPRESENTATION OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS AND EACH SUPPLEMENT
TO THIS PROSPECTUS  AND, IF GIVEN  OR MADE, SUCH  INFORMATION OR  REPRESENTATION
MUST NOT BE RELIED UPON. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR
A  SOLICITATION OF AN  OFFER TO BUY  ANY SECURITIES OTHER  THAN THE CERTIFICATES
OFFERED HEREBY, NOR AN OFFER OF THE  CERTIFICATES TO ANY PERSON IN ANY STATE  OR
OTHER  JURISDICTION IN WHICH SUCH OFFER WOULD  BE UNLAWFUL. THE DELIVERY OF THIS
PROSPECTUS AT ANY TIME DOES NOT IMPLY  THAT INFORMATION HEREIN IS CORRECT AS  OF
ANY  TIME SUBSEQUENT TO ITS  DATE; HOWEVER, IF ANY  MATERIAL CHANGE OCCURS WHILE
THIS PROSPECTUS IS  REQUIRED BY  LAW TO BE  DELIVERED, THIS  PROSPECTUS WILL  BE
AMENDED OR SUPPLEMENTED ACCORDINGLY.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
    There  are incorporated herein by reference  all documents and reports filed
or caused  to be  filed by  the Company  with respect  to a  Series pursuant  to
Section  13(a), Section  13(c), Section  14 or  Section 15(d)  of the Securities
Exchange Act of 1934,  prior to the termination  of an offering of  Certificates
evidencing interests therein. Upon request, the Company will provide or cause to
be  provided without charge to each person  to whom this Prospectus is delivered
in connection with the offering of one  or more Classes of Certificates, a  list
identifying  all filings  with respect  to a  Series pursuant  to Section 13(a),
Section 13(c), Section  14 or Section  15(d) of the  Securities Exchange Act  of
1934,  since the Company's last fiscal year covered by its annual report on Form
10-K, if any, and a copy of any or all documents or reports incorporated  herein
by reference, in each case to the extent such documents or reports relate to one
or  more such  Classes of  such Certificates,  other than  the exhibits  to such
documents (unless such  exhibits are specifically  incorporated by reference  in
such  documents). Requests  to the Company  should be directed  to: PNC Mortgage
Securities Corp., 75 North Fairway Dr., Vernon Hills, IL 60061, telephone number
(847) 549-6500, Attn: Legal Department.
 
                                       2
<PAGE>
                             SUMMARY OF PROSPECTUS
 
    THE FOLLOWING IS A SUMMARY OF CERTAIN PERTINENT INFORMATION AND IS QUALIFIED
IN  ITS ENTIRETY BY REFERENCE TO THE DETAILED INFORMATION APPEARING ELSEWHERE IN
THIS PROSPECTUS, AND BY REFERENCE TO  INFORMATION WITH RESPECT TO EACH  MORTGAGE
POOL  AND SERIES OF CERTIFICATES CONTAINED  IN THE SUPPLEMENT TO THIS PROSPECTUS
TO BE PREPARED IN CONNECTION WITH SUCH SERIES.
 
<TABLE>
<S>                           <C>
Title of Certificates.......  Mortgage Pass-Through  Certificates,  issuable  in
                              Series  and in one or  more Classes of each Series
                              (the "Certificates").
 
Depositor...................  PNC Mortgage Securities Corp. (the "Company"),  an
                              indirect subsidiary of PNC Bank Corp.
 
Description of
  Certificates..............  Each   Certificate  will  represent  an  undivided
                              interest in  one  of  a number  of  trusts  to  be
                              created  by  the Company  from  time to  time. The
                              property of each trust fund (a "Trust Fund")  will
                              consist  either of  a pool (a  "Mortgage Pool") of
                              mortgage  loans  secured  by  one-to   four-family
                              residential properties or multi-family residential
                              properties  (the "Mortgage  Loans") which Mortgage
                              Loans, if so specified  in the related  Prospectus
                              Supplement,   may  include  cooperative  apartment
                              loans ("Cooperative Loans"), and related  property
                              and  interests, conveyed to such Trust Fund by the
                              Company,  or   of  certificates   which  in   turn
                              represent ownership of a Mortgage Pool and related
                              property and interests. Unless otherwise specified
                              in  the  applicable  Prospectus  Supplement,  each
                              Certificate will represent an interest in all  the
                              principal  and in interest up  to a specified rate
                              on the Mortgage Loans in such Mortgage Pool. If so
                              specified in the Prospectus Supplement  applicable
                              to  any  Series,  Certificates  may  be  issued in
                              several  Classes,  which   may  pay  interest   at
                              different    rates,   may    represent   different
                              allocations of the right to receive principal  and
                              interest, and certain of which may be subordinated
                              to  others.  Any  such Class  of  Certificates may
                              provide for payments of principal only or interest
                              only or for disproportionate payments of principal
                              and interest. See  "Description of  Certificates".
                              The   related  Prospectus  Supplement  or  Current
                              Report on Form 8-K described below will set  forth
                              the  actual undivided interest in a Mortgage Pool,
                              or  entitlement  to  principal  and/or   interest,
                              represented   by   each   Certificate   (and,   if
                              applicable, describe  the  manner  in  which  such
                              undivided interest may change from time to time).
 
                              The   Certificates  will   be  offered   in  fully
                              registered  form   only.  If   specified  in   the
                              applicable  Prospectus  Supplement,  one  or  more
                              Classes of  Certificates  for any  Series  may  be
                              transferable  only on the  books of The Depository
                              Trust Company or another depository identified  in
                              such  Prospectus Supplement. The Certificates of a
                              particular Series or Class may or may not be rated
                              by  one  or  more  nationally  recognized   rating
                              organizations.   Neither  the   Certificates,  the
                              underlying Mortgage Loans nor certificates will be
                              guaranteed by the Company,  PNC Bank Corp. or  any
                              other   affiliate  of  the   Company  and,  unless
                              otherwise specified in  the applicable  Prospectus
                              Supplement,    neither   the   Certificates,   the
                              underlying Mortgage Loans nor certificates will be
                              insured or guaranteed by any governmental  agency.
                              Additional
</TABLE>
 
                                       3
<PAGE>
 
<TABLE>
<S>                           <C>
                              information  about the Mortgage Pool relating to a
                              Series of  Certificates  may  be set  forth  in  a
                              Current Report on Form 8-K that will be filed with
                              the  Securities and Exchange  Commission within 15
                              days after the issuance  of such Certificates.  If
                              so   indicated   in   the   applicable  Prospectus
                              Supplement, a Series  of Certificates may  include
                              one  or more Classes of Certificates (which may be
                              sold in one  or more private  offerings or may  be
                              offered  pursuant to this Prospectus) representing
                              subordinated  interests  in  the  Mortgage   Pool,
                              undivided  interests in a  portion of the interest
                              paid on the Mortgage Loans in the related Mortgage
                              Pool or such other  interests as may be  described
                              therein.
 
Sellers.....................  Mortgage  Loans will  be purchased  from qualified
                              originators or  entities  that have  purchased  or
                              otherwise   acquired   the  Mortgage   Loans  from
                              qualified originators  ("Sellers"),  as  described
                              herein.
 
Servicing and
  Administration............  Generally, the Company will be responsible for the
                              servicing and administration of the Mortgage Loans
                              (in  such capacity, the "Master Servicer") and the
                              Sellers will perform  certain servicing  functions
                              with  respect  to  the  Mortgage  Loans  (in  such
                              capacity, "Seller/Servicers"). If so specified  in
                              the applicable Prospectus Supplement, however, (i)
                              the  servicing  of  the  Mortgage  Loans  will  be
                              performed by the  Seller which  sold the  Mortgage
                              Loans  to the  Company for inclusion  in the Trust
                              Fund, or by a  qualified servicer selected by  the
                              Company  (either entity  acting in  such capacity,
                              the "Servicer"), (ii) there  will not be a  Master
                              Servicer  and  (iii)  the  Company  will calculate
                              amounts distributable  to the  Certificateholders,
                              prepare  tax returns  on behalf of  the Trust Fund
                              and provide certain other administrative  services
                              specified   in  the  Pooling  Agreement  (in  such
                              capacity, the "Certificate Administrator").
 
Interest....................  Except as  otherwise specified  in the  applicable
                              Prospectus  Supplement, interest  payments will be
                              passed through on the 25th day (or if such day  is
                              not  a business day,  the business day immediately
                              following such  25th day)  of each  month or  such
                              other   date  as   specified  in   the  applicable
                              Prospectus Supplement (the "Distribution Date") at
                              the  interest   rate   (the   "Remittance   Rate")
                              applicable   to   each   Class   of  Certificates,
                              commencing with the month  following the month  of
                              initial   issuance   of  such   Certificates.  See
                              "Maturity, Average Life and Prepayment
                              Assumptions", "Yield Considerations" and
                              "Description of Certificates".
 
Principal (including
  Principal Prepayments)....  Except as  otherwise specified  in the  applicable
                              Prospectus  Supplement, principal payments will be
                              passed  through   on   each   Distribution   Date,
                              commencing  with the month  following the month of
                              initial issuance of  each Series of  Certificates.
                              See   "Maturity,   Average  Life   and  Prepayment
                              Assumptions", "Yield Considerations" and
                              "Description of Certificates".
 
Advances....................  With respect to Series of Certificates as to which
                              the Company will act as Master Servicer and except
                              as otherwise specified in
</TABLE>
 
                                       4
<PAGE>
 
<TABLE>
<S>                           <C>
                              the applicable Prospectus  Supplement, the  Master
                              Servicer will be obligated to make advances of its
                              own  funds  in  order  to  cover  deficiencies  in
                              amounts   distributable   to    Certificateholders
                              resulting  from  Mortgagor delinquencies  only, to
                              the extent  the  Master Servicer  determines  such
                              advances  are recoverable from  future payments or
                              collections  on   the  Mortgage   Loans,   amounts
                              available as a result of any subordination feature
                              or from applicable credit enhancements. Similarly,
                              with respect to Series of Certificates as to which
                              the  Company will  not act as  Master Servicer and
                              the  servicing  of  the  Mortgage  Loans  will  be
                              performed by the Servicer, the Servicer, except as
                              otherwise  specified in  the applicable prospectus
                              supplement, will be obligated to make advances  of
                              its  own funds  in order to  cover deficiencies in
                              amounts distributable  to Certificateholders  only
                              to   the  extent  the   Servicer  determines  such
                              advances are recoverable  from future payments  or
                              collections   on   the  Mortgage   Loans,  amounts
                              available as  a  result of  any  subordination  in
                              right  of  payment  of  one  or  more  Classes  of
                              Certificates to such  rights of  holders of  other
                              Classes  of Certificates or from applicable credit
                              enhancements. See "Description of
                              Certificates--Advances".
 
The Mortgage Loans..........  Each  Mortgage   Pool  will   have  an   aggregate
                              principal  balance of at least $5,000,000 and will
                              consist of one or more  of the following types  of
                              Mortgage Loans with various original terms:
</TABLE>
 
<TABLE>
<S>                           <C>   <C>
                               (1)  fixed-rate,  fully amortizing Mortgage Loans
                                    providing  for  level  monthly  payments  of
                                    principal and interest;
 
                               (2)  adjustable-rate  Mortgage  Loans  ("ARMs" or
                                    "ARM Loans"),  which may  include  graduated
                                    payment  Mortgage  Loans and  other Mortgage
                                    Loans providing for negative amortization;
 
                               (3)  Mortgage  Loans,   with  either   fixed   or
                                    adjustable  rates, that  do not  provide for
                                    level  monthly  payments  of  principal  and
                                    interest   and/or   do   not   provide   for
                                    amortization  in  full  by  their   maturity
                                    dates;
 
                               (4)  fixed-rate   Mortgage  Loans   that  do  not
                                    provide for  amortization in  full by  their
                                    maturity  dates and which may  at the end of
                                    their terms be  converted by the  Mortgagors
                                    to fully-amortizing ARM Loans, provided that
                                    certain conditions are met; and
 
                               (5)  any   other  type   of  Mortgage   Loan,  as
                                    described  in   the  applicable   Prospectus
                                    Supplement.
</TABLE>
 
<TABLE>
<S>                           <C>
                              If  provided  for  in  the  applicable  Prospectus
                              Supplement, a Mortgage  Pool may contain  Mortgage
                              Loans   subject  to  buy-   down  plans  ("Buydown
                              Loans"). See "The Mortgage Pools".
 
Primary Insurance
  Policies..................  To  the   extent  specified   in  the   applicable
                              Prospectus Supplement, each Mortgage Loan having a
                              loan-to-value  ratio  at  origination  and  at the
                              applicable Cut-Off Date (as defined herein)  above
                              80%  (or another specified  level) will be covered
</TABLE>
 
                                       5
<PAGE>
 
<TABLE>
<S>                           <C>
                              by a primary mortgage insurance policy (a "Primary
                              Insurance Policy") insuring against default by the
                              Mortgagor with  respect  to  all  or  a  specified
                              portion of the principal amount thereof, until the
                              principal balance of such Mortgage Loan is reduced
                              below  80% of the then  current appraised value of
                              the Mortgaged Property or the principal balance of
                              the Mortgage Loan  at origination, as  applicable.
                              See  "The  Mortgage Pools"  and  "Primary Mortgage
                              Insurance, FHA  Mortgage  Insurance,  VA  Mortgage
                              Guaranty, Hazard Insurance; Claims Thereunder".
 
Credit Enhancements.........  The  Company or  the Servicer,  as applicable, may
                              obtain for certain Mortgage Pools a mortgage  pool
                              insurance   policy  (a  "Mortgage  Pool  Insurance
                              Policy"), limited in  scope, covering defaults  on
                              the  Mortgage Loans in such Mortgage Pool that are
                              not  covered  as   to  their  entire   outstanding
                              principal  balance by  insurance coverage provided
                              by the  Federal  Housing Authority  or  guarantees
                              issued by the Department of Veterans Affairs.
 
                              The  Company or  the Servicer,  as applicable, may
                              also obtain  for certain  Mortgage Pools  a  fraud
                              bond  (a "Fraud Bond"), limited in scope, insuring
                              Certificateholders against losses on any  Mortgage
                              Loan which result in an exclusion from, denial of,
                              or  defense to coverage  under a Primary Insurance
                              Policy  or,   if  applicable,   a  Mortgage   Pool
                              Insurance   Policy,   because   of   circumstances
                              involving fraudulent conduct or negligence by  the
                              Seller,  a  Seller/Servicer, the  Servicer  or the
                              related mortgagor (the "Mortgagor").
 
                              In addition,  the  Company  or  the  Servicer,  as
                              applicable,  may obtain for certain Mortgage Pools
                              a bankruptcy bond  (a "Bankruptcy Bond"),  limited
                              in  scope, insuring against  losses resulting from
                              the bankruptcy  of a  Mortgagor under  a  Mortgage
                              Loan contained in a Mortgage Pool.
 
                              All  of the Mortgage Loans (other than Cooperative
                              Loans and  Mortgage Loans  secured by  condominium
                              apartments)  will  be covered  by  standard hazard
                              insurance policies insuring against losses due  to
                              various  causes,  including  fire,  lightning  and
                              windstorm.  For  some   Series  of   Certificates,
                              certain   other  physical  risks   which  are  not
                              otherwise insured  against (including  earthquakes
                              in   some  geographical  regions,  mud  flows  and
                              floods)  will  be  covered  by  a  special  hazard
                              insurance  policy  (a  "Special  Hazard  Insurance
                              Policy")  to  be  obtained  with  respect  to  the
                              Mortgage Pool.
 
                              In  lieu of  obtaining one  or more  of the credit
                              enhancements  described  above,  the  Seller,  the
                              Company   or  the  Servicer,  as  applicable,  may
                              establish a reserve fund (a "Reserve Fund") and/or
                              obtain a letter of credit (a "Letter of  Credit"),
                              either    of   which    would   provide   coverage
                              substantially similar to the credit enhancement or
                              enhancements it replaces.  Any losses not  covered
                              by  any of  these credit enhancements  will not be
                              insured against  and will  therefore be  borne  by
                              Certificateholders   for  such  Series.  See  "The
                              Mortgage  Pools"   and  "Description   of   Credit
                              Enhancements".
</TABLE>
 
                                       6
<PAGE>
 
<TABLE>
<S>                           <C>
                              In  addition to the  credit enhancements described
                              above, the Company or the Servicer, as applicable,
                              may   obtain   or   provide   for   other   credit
                              enhancements  for a  Series of  Certificates which
                              provide for coverage of  certain risks of  default
                              or   losses,   such  as,   but  not   limited  to,
                              certificate insurance policies issued by  insurers
                              acceptable   to  each  rating  agency  rating  the
                              Certificates,   insuring   to   holders   of   the
                              Certificates   the  payment  of   amounts  due  in
                              accordance with the terms of the Certificates,  or
                              other   arrangements  acceptable  to  each  rating
                              agency  rating  the   Certificates.  Coverage   of
                              certain  risks  of  default or  loss  may  also be
                              provided to  a  particular  Class  or  Classes  of
                              Certificates  by  the  subordination  in  right of
                              payment of one or more Classes of Certificates  of
                              the  same Series to  the right of  holders of such
                              Class  or  Classes  of  Certificates  to   receive
                              payments.
 
                              The  Prospectus  Supplement for  each  Series will
                              indicate whether such Series or the Mortgage Loans
                              contained therein  are covered  by various  credit
                              enhancements,  indicating  the nature,  amount and
                              extent of such coverage.
 
Private Certificates and
  Agency Certificates.......  If specified in the related Prospectus Supplement,
                              a  Trust   Fund  may   include  private   mortgage
                              pass-through certificates ("Private Certificates")
                              or  certificates issued  by the  Federal Home Loan
                              Mortgage  Corporation   ("FHLMC"),   the   Federal
                              National  Mortgage  Association  ("FNMA")  or  the
                              Government National Mortgage Association  ("GNMA")
                              (collectively, "Agency Certificates"). Any Private
                              Certificates   or  Agency   Certificates  will  be
                              described in the related Prospectus Supplement.
 
Tax Status..................  For   Federal    income    tax    purposes,    the
                              Certificateholders  of a Series will be considered
                              to own "regular interests" or "residual interests"
                              in a REMIC. Holders of Certificates designated  in
                              the  applicable Prospectus  Supplement as "regular
                              interests" will be treated  as holders of debt  of
                              the  REMIC for  federal income  tax purposes. Such
                              Certificateholders must include in income interest
                              due  and   original   issue  discount   on   their
                              Certificates   using   the   accrual   method   of
                              accounting, regardless of  their usual methods  of
                              accounting.  Holders of Certificates designated in
                              the applicable Prospectus Supplement as  "residual
                              interests"  will  be  taxable  on  their allocable
                              share  of  the   taxable  income   of  the   REMIC
                              regardless  of  the  cash  distributable  on  such
                              interests.  See   "Certain  Federal   Income   Tax
                              Consequences--Taxation of Owners of REMIC Residual
                              Certificates".
 
                              With    certain   exceptions   described   herein,
                              Certificates held by a "domestic building and loan
                              association"  will  be  considered  to   represent
                              "loans  secured by  an interest  in real property"
                              within the meaning of Section 7701(a)(19)(C)(v) of
                              the Internal Revenue Code of 1986, as amended (the
                              "Code"),  and   to  represent   "qualifying   real
                              property  loans"  within  the  meaning  of Section
                              593(d) of the Code.
</TABLE>
 
                                       7
<PAGE>
 
<TABLE>
<S>                           <C>
                              See "Certain Federal Income Tax Consequences".
 
Optional Termination........  For each Series of Certificates, the Company  will
                              have the option to repurchase the related Mortgage
                              Loans  or certificates,  as the  case may  be, and
                              thereby effect the early retirement of such Series
                              at any time  after the principal  balances of  the
                              Mortgage Loans or certificates aggregate less than
                              the percentage specified in the related Prospectus
                              Supplement  of the aggregate  principal balance of
                              the Mortgage Loans  in such Mortgage  Pool or  the
                              certificates  as of the first  day of the month in
                              which such Certificates were issued or such  other
                              day   as  may  be   specified  in  the  applicable
                              Prospectus Supplement  (the "Cut-Off  Date").  The
                              amount   distributable  to  Certificateholders  in
                              connection with any such  repurchase will also  be
                              set forth in the applicable Prospectus Supplement.
 
Investment Considerations...  Potential  investors should be  aware that (a) any
                              decline in  the value  of  a property  securing  a
                              Mortgage  Loan in a Mortgage  Pool may result in a
                              loss  to   Certificateholders   if   the   related
                              Mortgagor  defaults and the loss is not covered by
                              the credit enhancements provided for such Mortgage
                              Loan or Mortgage Pool and (b) any hazard loss  not
                              covered by the standard hazard insurance policy or
                              any  applicable Special Hazard Insurance Policy or
                              comparable credit enhancement covering a defaulted
                              Mortgage  Loan   may   result   in   a   loss   to
                              Certificateholders.
 
                              Prepayments    of   Mortgage   Loans,   or   early
                              liquidations of Mortgage  Loans by foreclosure  or
                              otherwise (whether or not a loss is incurred) may,
                              in  certain circumstances, increase or, in certain
                              circumstances, decrease Certificateholders'  yield
                              on  the  Certificates. See  "Yield Considerations"
                              and  "Maturity,   Average  Life   and   Prepayment
                              Assumptions".
 
                              There is no assurance that a secondary market will
                              exist for any Series of the Certificates.
 
                              See "Risk Factors" herein.
 
ERISA Limitations...........  A  fiduciary of any  employee benefit plan subject
                              to the Employee Retirement Income Security Act  of
                              1974, as amended ("ERISA"), or Section 4975 of the
                              Code  (and any person which  proposes to cause any
                              such  plan   to   acquire   Certificates)   should
                              carefully  review  with  its  own  legal  advisors
                              whether the  purchase or  holding of  Certificates
                              could  give  rise to  a transaction  prohibited or
                              otherwise impermissible under  ERISA or the  Code.
                              See "ERISA Considerations".
</TABLE>
 
                                       8
<PAGE>
                                  RISK FACTORS
 
    Investors  should  consider, among  other things,  the following  factors in
connection with the purchase of the Certificates:
 
    LIMITED LIQUIDITY.  There  can be no assurance  that a secondary market  for
the Certificates of any Series will develop or, if it does develop, that it will
provide Certificateholders with liquidity of investment or that it will continue
for  the life of the  Certificates of any Series.  The Prospectus Supplement for
any Series of Certificates  may indicate that  an underwriter specified  therein
intends  to  establish  a secondary  market  in such  Certificates.  However, no
underwriter will be obligated to do  so and offerings may be effected  hereunder
without participation by any underwriter. The Certificates will not be listed on
any securities exchange.
 
    LIMITED  OBLIGATIONS.  The Certificates will not represent an interest in or
obligation of  the Company,  PNC Bank  Corp.  or any  of their  affiliates.  The
obligations  of the  Company with  respect to  the Certificates  or the Mortgage
Loans will be limited to any representations and warranties made by the  Company
in,  as  well  as any  servicing  and/or administrative  obligations  under, the
Pooling Agreement (as defined  herein) for each  Series of Certificates.  Unless
otherwise  specified in the applicable Prospectus Supplement, these obligations,
for Series of Certificates as to which the Company will act as Master  Servicer,
will  consist  primarily  of  the  obligation  under  certain  circumstances  to
repurchase Mortgage Loans as to which there has been a breach of representations
and warranties  which materially  and  adversely affects  the interests  of  the
Certificateholders  in  a Mortgage  Loan or  to cure  such breach.  In addition,
unless otherwise specified in the  applicable Prospectus Supplement, the  Master
Servicer  will have a limited obligation to make certain advances (to the extent
not previously advanced by the  Seller/Servicers) in the event of  delinquencies
on  the Mortgage Loans, but only to  the extent deemed recoverable. Except as so
described in the  related Prospectus Supplement,  neither the Certificates,  the
underlying  Mortgage Loans nor Certificateholders  will be guaranteed or insured
by any governmental agency or instrumentality, or  by the Company or any of  its
affiliates.  Proceeds of the assets included in  the related Trust Fund for each
Series of Certificates  (including the  Mortgage Loans  and any  form of  credit
enhancement)  will be the sole source of payments on the Certificates, and there
will be no recourse to  the Company or any other  entity in the event that  such
proceeds are insufficient or otherwise unavailable to make all payments provided
for under the Certificates.
 
    LIMITATIONS, REDUCTION AND SUBSTITUTION OF CREDIT ENHANCEMENT.  With respect
to  each Series of  Certificates, credit enhancement may  be provided in limited
amounts to  cover certain  types of  losses on  the underlying  Mortgage  Loans.
Credit  enhancement will  be provided in  one or  more of the  forms referred to
herein, including,  but  not  limited  to: subordination  of  other  Classes  of
Certificates  of the same Series; a Letter  of Credit; a Mortgage Pool Insurance
Policy; a Special Hazard  Insurance Policy; a Fraud  Bond; a Bankruptcy Bond;  a
Reserve   Fund;  and  any  combination   thereof.  See  "Description  of  Credit
Enhancements" herein. Regardless of the form of credit enhancement provided, the
amount of coverage will be limited in  amount and in most cases will be  subject
to  periodic reduction  in accordance with  a schedule  or formula. Furthermore,
such credit enhancements may  provide only very limited  coverage as to  certain
types  of  losses, and  may provide  no coverage  as to  certain other  types of
losses.  All  or  a  portion  of  the  credit  enhancement  for  any  series  of
Certificates   will  generally  be  permitted   to  be  reduced,  terminated  or
substituted for,  if  each applicable  rating  agency indicates  that  the  then
current  rating  thereof will  not be  adversely  affected. See  "Description of
Credit Enhancements".
 
    RISKS OF  THE MORTGAGE  LOANS.   An  investment in  securities such  as  the
Certificates  which  generally  represent  interests in  mortgage  loans  may be
affected by, among other things, a decline in real estate values and changes  in
the  related Mortgagors' financial condition. No assurance can be given that the
values of the  Mortgaged Properties (as  defined herein) have  remained or  will
remain  at their  levels on  the dates  of origination  of the  related Mortgage
Loans. If  the  residential real  estate  market should  experience  an  overall
decline  in property values  such that the outstanding  balances of the Mortgage
Loans, and any secondary financing on the Mortgaged Properties, in a  particular
Mortgage  Pool  become equal  to  or greater  than  the value  of  the Mortgaged
Properties, the actual rates of delinquencies, foreclosures and losses could  be
higher than those now generally experienced in the mortgage lending industry. In
addition,  in  the case  of  the Mortgage  Loans  that are  subject  to negative
amortization, the principal balances of  such Mortgage Loans could be  increased
to amounts equal to or
 
                                       9
<PAGE>
in  excess  of  the  values  of  the  underlying  Mortgaged  Properties, thereby
increasing the likelihood  of default. To  the extent that  such losses are  not
covered  by the  applicable credit enhancement,  holders of  Certificates of the
Series evidencing interests in the related  Mortgage Pool will bear all risk  of
loss resulting from default by Mortgagors and will have to look primarily to the
value  of the Mortgaged Properties for recovery of the outstanding principal and
unpaid interest on the defaulted Mortgage  Loans. Certain of the types of  loans
which may be included in the Mortgage Pools may involve additional uncertainties
not  present in traditional types of loans. For example, certain of the Mortgage
Loans may provide for  escalating or variable payments  by the Mortgagor, as  to
which  the Mortgagor is generally qualified on  the basis of the initial payment
amount. In some instances the Mortgagors' income may not be sufficient to enable
them to continue to make their loan payments as such payments increase and  thus
the  likelihood of default will increase.  In addition to the foregoing, certain
geographic regions of the United States from time to time will experience weaker
regional  economic  conditions  and  housing  markets  and,  consequently,  will
experience higher rates of loss and delinquency on mortgage loans generally. The
Mortgage  Loans underlying certain Series of Certificates may be concentrated in
these regions,  and  such  concentration  may  present  risk  considerations  in
addition  to  those  generally present  for  similar  mortgage-backed securities
without such concentration.
 
    YIELD  AND  PREPAYMENT  CONSIDERATIONS.    The  yield  to  maturity  of  the
Certificates  of  each  Series will  depend  on  the rate  of  principal payment
(including prepayments, liquidations  due to  defaults and  repurchases) on  the
Mortgage  Loans and the price paid by Certificateholders. Such yield to maturity
may be  adversely  affected  by a  higher  or  lower than  anticipated  rate  of
prepayments on the related Mortgage Loans. The yield to maturity on Certificates
entitling  the holders thereof primarily or  exclusively to payments of interest
on the Mortgage Loans will be extremely sensitive to the rate of prepayments  on
the  related Mortgage Loans.  In addition, the  yield on certain  other types of
Classes of  Certificates  may  be  relatively more  sensitive  to  the  rate  of
prepayment  on the  related Mortgage Loans  than other  Classes of Certificates.
Prepayments are influenced by a number of factors, including prevailing mortgage
market interest  rates, local  and regional  economic conditions  and  homeowner
mobility.  See "Yield Considerations" and "Maturity, Average Life and Prepayment
Assumptions".
 
                              THE MORTGAGE POOLS*
 
GENERAL
 
    Unless otherwise  indicated in  the applicable  Prospectus Supplement,  each
Mortgage Pool will consist entirely of either fixed- or adjustable-rate mortgage
loans  (the  "Mortgage  Loans")  evidenced by  promissory  notes  (the "Mortgage
Notes") secured  by first  mortgages,  deeds of  trust  or security  deeds  (the
"Mortgages")  on  one-  to four-family  residential  properties  or multi-family
residential properties  (the "Mortgaged  Properties").  The types  of  Mortgaged
Properties  securing the  Mortgage Loans in  each Mortgage Pool  may include (a)
owner occupied,  (i) attached  or detached  single-family residences,  including
residences  in  planned  unit  developments, (ii)  two-  to  four-family primary
residences  and  (iii)  condominiums  or  other  attached  dwelling  units,  (b)
second/vacation homes and nonowner occupied residences, and (c) such other types
of  homes or dwellings as are set forth in the related Prospectus Supplement. If
specified in the applicable Prospectus  Supplement, a Mortgage Pool may  contain
cooperative  apartment loans ("Cooperative Loans") evidenced by promissory notes
("Cooperative Notes") secured by security interests in shares issued by  private
cooperative  housing  corporations (each,  a "Cooperative")  and in  the related
proprietary leases or occupancy agreements  granting exclusive rights to  occupy
specific  dwelling units  in the related  buildings. As used  herein, unless the
context  indicates  otherwise,  "Mortgage  Loans"  includes  Cooperative  Loans,
"Mortgaged  Properties"  includes  shares  in the  related  Cooperative  and the
related proprietary leases or  occupancy agreements securing Cooperative  Notes,
"Mortgage  Notes" includes Cooperative Notes and "Mortgages" includes a security
agreement with respect to a Cooperative Note.
 
- --------------
* Whenever  in this  Prospectus the  terms "Mortgage  Pool", "Certificates"  and
"Trust  Fund"  are  used,  those  terms  apply,  unless  the  context  indicates
otherwise, to  one  specific  Mortgage  Pool,  to  the  Series  of  Certificates
representing  undivided interests in  the related Trust Fund  and to the related
Trust Fund, respectively. Similarly,  the term "Remittance  Rate" will refer  to
the  rate of interest borne by the Certificates of one specific Series (or borne
by one Class of Certificates of one specific Series).
 
                                       10
<PAGE>
    The Mortgage  Loans  to be  purchased  by the  Company  for inclusion  in  a
Mortgage Pool will be screened and underwritten in accordance with the standards
set  forth herein under "The Company-- Mortgage Purchase Program" and "--Credit,
Appraisal and Underwriting Standards". The Mortgage Loans in each Mortgage  Pool
will  be originated  by or  purchased from  lending institutions  which meet the
requirements set  forth under  "The  Company--Mortgage Purchase  Program"  (such
institutions,  "Sellers"). Generally,  the Company  will be  responsible for the
servicing and administration of the Mortgage Loans and the Sellers will  perform
certain  servicing  functions  with  respect  to  the  Mortgage  Loans  (in such
capacity,   "Seller/Servicers"),   which   term   includes   related   servicing
corporations,  agents and replacement servicers designated by the Company. If so
specified in the applicable Prospectus Supplement, however, (i) the servicing of
the Mortgage Loans will be performed by the Seller which sold the Mortgage Loans
to the Company  for inclusion  in the  Trust Fund,  or by  a qualified  servicer
selected by the Company (either entity acting in such capacity, the "Servicer"),
(ii)  there will not be  a Master Servicer and  (iii) the Company will calculate
amounts distributable to the Certificateholders,  prepare tax returns on  behalf
of the Trust Fund and provide certain other administrative services specified in
the  Pooling Agreement (in such  capacity, the "Certificate Administrator"). The
Servicer  and  the  Certificate  Administrator  may  perform  their   respective
servicing  and  administrative  responsibilities through  agents  or independent
contractors, but shall  not thereby be  released from any  of their  obligations
under  the Pooling Agreement. See  "Description of Certificates--Servicing". The
applicable Prospectus  Supplement  will  set forth  information  respecting  the
number  and principal  amount of  Mortgage Loans  which were  originated for the
purpose of (a) purchasing and (b) refinancing the related Mortgaged Properties.
 
    To the extent  specified in the  applicable Prospectus Supplement,  Mortgage
Loans  with  loan-to-value ratios  and/or  principal balances  exceeding certain
limits will be covered partially by Primary Insurance Policies. A Mortgage  Pool
may include Mortgage Loans insured by the Federal Housing Administration ("FHA")
or  guaranteed by the Department of Veterans Affairs ("VA"), which loans will be
covered by FHA insurance policies  ("FHA Insurance Policies") and VA  guaranties
("VA  Guaranties"),  respectively.  Mortgage  Loans guaranteed  by  the  VA ("VA
Loans") may  also be  covered  by supplemental  Primary Insurance  Policies.  In
addition, if specified in the applicable Prospectus Supplement, the Company, the
Seller  or the  Servicer, as  applicable, may  obtain or  establish one  or more
credit enhancements for  a Mortgage Pool.  Any such credit  enhancement will  be
described  in the applicable Prospectus Supplement. Such credit enhancements may
be limited to one or more Classes of Certificates and may include, but will  not
necessarily  be  limited to,  any of  the following:  a Mortgage  Pool Insurance
Policy, a Special Hazard  Insurance Policy, a Fraud  Bond, a Bankruptcy Bond,  a
Letter  of  Credit,  a Reserve  Fund,  a  certificate insurance  policy,  or any
combination of the foregoing. Coverage of  certain risks of default or loss  may
also  be  provided to  a  particular Class  or  Classes of  Certificates  by the
subordination in right of payment of one or more Classes of Certificates of  the
same  Series to the right of holders of such Class or Classes of Certificates to
receive payments. See "Description of Credit Enhancements".
 
    Unless otherwise  specified in  the related  Prospectus Supplement  for  any
Series  of  Certificates, all  Mortgage  Loans will  be of  one  or more  of the
following types of Mortgage Loans of varying terms at origination:
 
        (1) fully amortizing  Mortgage Loans, each  providing for interest  (the
    "Mortgage  Interest Rate")  at a  fixed rate  and level  monthly payments of
    principal and interest over the term of such Mortgage Loan;
 
        (2) Mortgage  Loans, each  with an  adjustable Mortgage  Interest  Rate,
    which  may include graduated payment Mortgage Loans and other Mortgage Loans
    providing for negative amortization;
 
        (3) Mortgage Loans  with either  fixed or  adjustable Mortgage  Interest
    Rates,  that  do not  provide for  level monthly  payments of  principal and
    interest and/or do not  provide for amortization in  full by their  maturity
    dates;
 
        (4)  fixed-rate Mortgage Loans  that do not  provide for amortization in
    full by their  maturity dates and  which may at  the end of  their terms  be
    converted  by the  Mortgagors to  fully amortizing  adjustable-rate Mortgage
    Loans, provided that certain conditions are met; and
 
                                       11
<PAGE>
        (5) any  other  type  of  Mortgage  Loan  described  in  the  applicable
    Prospectus Supplement.
 
    If  so  specified in  the related  Prospectus Supplement  for any  Series of
Certificates, a Mortgage Pool may contain Buydown Loans which include provisions
whereby the Seller or a third party partially subsidizes the monthly payments of
the Mortgagor during the initial  portion of the term  of the Buydown Loan,  the
difference  to be made  up from a  fund (the "Buydown  Fund") contributed by the
Seller or a  third party  at the  time of origination  of the  Mortgage Loan.  A
Buydown  Fund will be in an amount equal  either to the discounted value or full
aggregate  amount  of  future  payment  subsidies.  The  applicable   Prospectus
Supplement  or Current Report on Form  8-K will contain information with respect
to any  Buydown Loans,  including  information on  the interest  rate  initially
payable  by the Mortgagor, annual increases in  the interest rate, the length of
the buydown period and  the Buydown Fund. The  underlying assumption of  buydown
plans  is that  the income  of the  Mortgagor will  increase during  the buydown
period as a result of normal increases in compensation and of inflation, so that
the Mortgagor will be able to meet the full mortgage payments at the end of  the
buydown period. To the extent that this assumption as to increased income is not
correct, the possibility of defaults on Buydown Loans is increased.
 
    The aggregate principal balances of the Mortgage Loans in each Mortgage Pool
on  the date specified in the related  Prospectus Supplement as the Cut-Off Date
will be  at  least $5,000,000.  Unless  otherwise specified  in  the  Prospectus
Supplement  of a particular Series, each  Mortgage Loan at origination will have
an outstanding  principal  balance  of  not less  than  $30,000  nor  more  than
$1,000,000.  With respect to  each Mortgage Pool,  unless otherwise specified in
the related Prospectus Supplement,  all principal and  interest payments on  the
Mortgage Loans due prior to the Cut-Off Date will have been made.
 
    For  each Mortgage  Pool, the  related Prospectus  Supplement will generally
contain specific information as of the Cut-Off Date regarding (i) the  aggregate
principal  balance of  the Mortgage Loans;  (ii) the range  of Mortgage Interest
Rates or initial Mortgage Interest Rates borne by the Mortgage Loans; (iii)  the
month  and  year in  which  the first  monthly  payments occur,  and  the latest
maturity of the Mortgage Loans; (iv) the largest and smallest principal balances
of the Mortgage Loans at origination; (v) the aggregate principal balance of all
Mortgage Loans having  loan-to-value ratios at  origination exceeding 80%;  (vi)
the  types  of  dwellings  constituting the  Mortgaged  Properties  securing the
Mortgage Loans;  (vii)  the  percentage  of the  Mortgage  Loans  (by  principal
balance)  of nonowner occupied and of second and vacation properties; (viii) the
geographic distribution  of the  Mortgage Loans,  prepared on  a  state-by-state
basis for states containing 5% or more of the Mortgage Pool; and (ix) the number
and aggregate principal balance of Buydown Loans.
 
    Specific  information with  respect to  the Mortgage  Loans in  a particular
Mortgage Pool and the  applicable credit enhancements which  is not included  in
the related Prospectus Supplement will generally be included in a Current Report
on  Form 8-K  which will be  available to  purchasers of the  Certificates at or
before the time of initial issuance  of the related Series of Certificates,  and
which   will  be  filed  with  the   Securities  and  Exchange  Commission  (the
"Commission") within 15 days thereafter.
 
    Generally, the Company will act  as master servicer (the "Master  Servicer")
and  will be responsible  for administering and servicing  the Mortgage Loans in
each Mortgage  Pool.  The Master  Servicer  has entered  or  will enter  into  a
contract  with each  Seller/Servicer to  perform, as  an independent contractor,
certain servicing functions for the  Master Servicer subject to its  supervision
and   may  enter  into  a  contract   with  an  independent  entity  to  perform
administration  functions  for  the  Mortgage  Pools,  subject  to  the   Master
Servicer's  supervision. Unless otherwise specified in the applicable Prospectus
Supplement, the Master  Servicer will reserve  the right to  remove the  Seller/
Servicer  of any Mortgage Loan at any time if the Master Servicer considers such
removal to be in  the best interests of  Certificateholders. In such event,  the
Master  Servicer would  continue to be  responsible for  servicing such Mortgage
Loan and intends to designate  a replacement Seller/Servicer (which may  include
the Company or an affiliate of the Company). The Master Servicer may perform its
administrative  and  servicing  responsibilities through  agents  or independent
contractors, but shall not thereby be released from any of its  responsibilities
under the Pooling Agreement. The Master Servicer will receive a fee (the "Master
Servicing  Fee")  for its  services. The  Seller/Servicers will  perform certain
servicing functions  for  the  Company  pursuant  to  servicing  contracts  (the
"Servicing  Contracts")  with the  Master Servicer  and will  receive a  fee for
acting as the primary servicer of the
 
                                       12
<PAGE>
related Mortgage Loans (the  "Servicing Fee"). The fees  to the Master  Servicer
and  the Seller/ Servicers will be paid from the difference between the Mortgage
Interest Rates on  each Mortgage Loan  and the Remittance  Rate with respect  to
such Mortgage Loan.
 
    If  so specified in  the applicable Prospectus  Supplement, the Company will
not act as  Master Servicer  for a particular  Series of  Certificates. In  such
event, (i) the servicing of the Mortgage Loans will be performed by the Servicer
specified  in the  applicable Prospectus  Supplement, (ii)  there will  not be a
Master Servicer, and (iii) the Certificate Administrator will calculate  amounts
distributable  to the Certificateholders,  prepare tax returns  on behalf of the
Trust Fund and provide  certain other administrative  services specified in  the
Pooling  Agreement. The Servicer  and the Certificate  Administrator may perform
their respective servicing and administrative responsibilities through agents or
independent contractors, but  shall not thereby  be released from  any of  their
respective  responsibilities under the  Pooling Agreement. With  respect to such
Series of Certificates,  the Servicer  will receive  the Servicing  Fee and  the
Certificate  Administrator will receive a fee for its services (the "Certificate
Administrator Fee"), each of which will be paid from the difference between  the
Mortgage  Interest  Rate on  each  Mortgage Loan  and  the Remittance  Rate with
respect to such Mortgage Loan.
 
    Unless otherwise  specified in  the  applicable Prospectus  Supplement,  the
Certificates  of each Series will represent  undivided interests in a Trust Fund
consisting of the Mortgage Loans included  in the Mortgage Pool for that  Series
and related property. Certain Series will be enhanced by mortgage loan insurance
or  other forms  of credit  enhancement, in  each case  as more  fully described
herein under  the captions  "Description of  Certificates" and  "Description  of
Credit  Enhancements"  and/or in  the related  Prospectus Supplement.  When each
Series of Certificates is issued, the  Company will cause the Mortgage Loans  in
the Mortgage Pool for that Series to be assigned to an independent bank or trust
company   as  trustee  (the  "Trustee")  for  the  benefit  of  the  holders  of
Certificates of that  Series, and the  Master Servicer or  the Servicer will  be
responsible  for servicing the Mortgage Loans pursuant to a separate pooling and
servicing agreement ("Pooling Agreement") for the Series.
 
    The Company's  assignment of  the  Mortgage Loans  to  the Trustee  will  be
without  recourse, and  the Company's obligations  with respect  to the Mortgage
Loans will, unless otherwise indicated in the Prospectus Supplement for a Series
of Certificates, be limited to any representations and warranties made by it in,
as well as  its contractual obligations  under, the Pooling  Agreement for  each
Series. These obligations consist primarily of the obligation to administer and,
if  applicable,  service  the Mortgage  Loans  and,  with respect  to  Series of
Certificates as to  which the  Company will act  as Master  Servicer and  unless
otherwise  stated in the Prospectus Supplement for  such Series, in the event of
delinquencies in payments on the Mortgage Loans in any Mortgage Pool, to advance
cash  ("Advances")  in  the  amounts  described  herein  under  "Description  of
Certificates--Advances",  to  the  extent  such Advances  are  not  made  by the
Seller/Servicers. Any such Advances  by the Master Servicer  will be limited  to
amounts  which,  in the  judgment  of the  Master  Servicer, ultimately  will be
reimbursable with respect to such Mortgage Pool from Mortgagor payments or under
any applicable Mortgage  Pool Insurance  Policy, any  applicable Special  Hazard
Insurance  Policy,  any Primary  Insurance Policy,  FHA  Insurance Policy  or VA
Guaranty issued  with respect  to  a Mortgage  Loan,  any applicable  Letter  of
Credit,   Reserve  Fund  or  any  other  applicable  policy  of  insurance,  any
subordination feature  described herein  or  the proceeds  of liquidation  of  a
Mortgage  Loan.  See  "Description  of  Credit  Enhancements".  Unless otherwise
specified in the applicable Prospectus Supplement, each Seller/Servicer will  be
obligated, in the event of delinquencies on the Mortgage Loans serviced by it in
any  Mortgage Pool, to make Advances limited  to amounts which, in its judgment,
after consultation with  the Master  Servicer, ultimately  will be  reimbursable
from  the sources  stated above.  If so  specified in  the applicable Prospectus
Supplement, neither  the  Master  Servicer  nor  the  Seller/Servicers  will  be
obligated to make Advances with respect to Mortgage Loans delinquent longer than
the  time period  specified in such  Prospectus Supplement.  See "Description of
Certificates--Advances" and  "Description of  Credit Enhancements".  The  Master
Servicer  is obligated  to remit to  Certificateholders of a  Series all amounts
relating to the Mortgage Loans to the extent such amounts have been collected or
advanced by the Seller/Servicers or advanced by the Master Servicer and are  due
Certificateholders  pursuant  to the  terms of  the  Pooling Agreement  for such
Series. With respect to Series of Certificates as to which the Company will  not
act as Master Servicer and the servicing of the Mortgage Loans will be performed
by   the  Servicer,  unless  otherwise   stated  in  the  applicable  Prospectus
Supplement,   the   Servicer   will   be   obligated   to   make   Advances   in
 
                                       13
<PAGE>
the  amounts  described  herein under  "Description  of Certificates--Advances",
limited to amounts which,  in the judgment of  the Servicer, ultimately will  be
reimbursable  with respect to such Mortgage Pool  from any of the sources stated
above.
 
CONVERSION OF MORTGAGE LOANS
 
    The Prospectus Supplement  for certain Series  of Certificates  representing
undivided interests in a Trust Fund consisting of adjustable-rate Mortgage Loans
may  provide that some or all of the Mortgage Loans in the related Mortgage Pool
may have  a  conversion  feature.  Unless otherwise  specified  in  the  related
Prospectus  Supplement,  each  such  Mortgage  Loan  may  be  converted  at  the
Mortgagor's option at any time during a specified initial period to a fixed-rate
Mortgage Loan, subject to the Seller/Servicer's or the Servicer's  determination
that  the Mortgagor has met certain payment history requirements and the payment
of a conversion fee ("Conversion Fee")  to the Seller/Servicer or the  Servicer,
as   applicable.  Unless  otherwise  specified   in  the  applicable  Prospectus
Supplement, upon any such  conversion, the Master Servicer,  or the Seller  with
respect to Series of Certificates as to which the Company will not act as Master
Servicer,  will repurchase the Mortgage Loan from  the Mortgage Pool at its then
outstanding principal balance, plus  interest at the  Mortgage Interest Rate  on
such  Mortgage  Loan to  the date  of repurchase.  The amounts  distributable to
Certificateholders of different  Classes, if applicable,  upon such  repurchase,
and   the   portion   of  the   Conversion   Fee   to  be   passed   through  to
Certificateholders, if any, will be set  forth in the Prospectus Supplement  for
each such Series of Certificates.
 
                                USE OF PROCEEDS
 
    All  of the net proceeds to be received  from the sale of each Series of the
Certificates will be used by the Company to purchase the Mortgage Loans  related
to that Series or to return to the Company the amounts previously used to effect
such  purchases, the  costs of  carrying the  Mortgage Loans  until sale  of the
Certificates and other expenses  connected with pooling  the Mortgage Loans  and
issuing the Certificates, or for general corporate purposes. The Company expects
to  issue Certificates  in Series from  time to  time as part  of its continuing
program  of  acquiring  Mortgage  Loans  and  selling  Certificates.  See   "The
Company--Mortgage Purchase Program".
 
                              YIELD CONSIDERATIONS
 
GENERAL
 
    The  yield to maturity on any Certificate  will depend on the purchase price
paid by the Certificateholder,  the effective interest  rate of the  Certificate
and  the weighted average life of the Mortgage Loans underlying the Certificate.
See "Maturity,  Average Life  and Prepayment  Assumptions" for  a discussion  of
weighted  average life. Any  prepayment of a  Mortgage Loan or  liquidation of a
Mortgage Loan (by  foreclosure proceedings  or by virtue  of the  purchase of  a
Mortgage  Loan in  advance of  its stated maturity  or otherwise)  will have the
effect of passing through to Certificateholders amounts of principal which would
otherwise be passed through in amortized  increments over the remaining term  of
such  Mortgage Loan. The effect of such  prepayments on the yield to maturity to
Certificateholders depends on several factors. For example, if the  Certificates
are  purchased above par (I.E., for more  than 100% of the outstanding principal
balance of the  Mortgage Loans they  represent), such prepayments  will tend  to
decrease the yield to maturity. If the Certificates were purchased at a discount
(I.E.,  for  less  than  100%  of  such  outstanding  principal  balance),  such
prepayments will tend  to increase  the yield  to maturity.  See "Certain  Legal
Aspects  of  the Mortgage  Loans--Enforceability  of Certain  Provisions"  for a
description  of  certain  provisions  of  each  Mortgage  Loan  and   statutory,
regulatory  and judicial developments that  may affect the prepayment experience
and maturity  assumptions  on  the  Mortgage Loans.  See  also  "Description  of
Certificates--  Termination" for a description of the repurchase of the Mortgage
Loans in  any Mortgage  Pool when  the aggregate  outstanding principal  balance
thereof  is  less  than  a specified  percentage  of  the  aggregate outstanding
principal balance of  the Mortgage Loans  in such Mortgage  Pool on the  related
Cut-Off Date.
 
    The timing of changes in the rate of principal payments on or repurchases of
the  Mortgage  Loans  may significantly  affect  an investor's  actual  yield to
maturity, even if the average rate  of principal payments experienced over  time
is  consistent  with  an  investor's  expectation.  In  general,  the  earlier a
 
                                       14
<PAGE>
prepayment of  principal  on  the  underlying Mortgage  Loans  or  a  repurchase
thereof, the greater will be the effect on an investor's yield to maturity. As a
result,  the effect on an investor's yield to maturity of principal payments and
repurchases occurring at a rate higher  (or lower) than the rate anticipated  by
the investor during the period immediately following the issuance of a Series of
Certificates  would  not be  fully  offset by  a  subsequent like  reduction (or
increase) in the rate of principal payments.
 
EFFECTIVE INTEREST RATE
 
    Unless otherwise  specified in  the applicable  Prospectus Supplement,  each
monthly  interest  payment on  a  Mortgage Loan  is  calculated as  1/12  of the
applicable Mortgage Interest  Rate multiplied  by the  unpaid principal  balance
outstanding  on  the  first day  of  the  month after  application  of principal
payments made  on  such  date.  Unless otherwise  specified  in  the  applicable
Prospectus  Supplement, the Remittance Rate for  each Class of Certificates will
be calculated on the basis of  the "Pass-Through Rate" for the related  Mortgage
Loans. With respect to a Series of Certificates as to which the Company will act
as Master Servicer, the "Pass-Through Rate" for any Mortgage Loan will equal the
related  Mortgage Interest Rate less the sum of the Servicing Fee and the Master
Servicing Fee for such Mortgage Loan.  With respect to a Series of  Certificates
as to which the Company will not act as Master Servicer, the "Pass-Through Rate"
for any Mortgage Loan will equal the related Mortgage Interest Rate less the sum
of  the Servicing  Fee and the  Certificate Administrator Fee  for such Mortgage
Loan.
 
    As described in the applicable Prospectus Supplement, in certain events,  if
the amounts available for distribution in respect of interest are not sufficient
to  cover the total of all accrued and unpaid interest at the Pass-Through Rate,
the available amount will be distributed  to the Certificateholders pro rata  in
accordance  with their respective interests or in an order of priority described
in the applicable Prospectus Supplement.
 
    For the  sale  of  Certificates  under  this  Prospectus,  the  Company  may
establish  one or more Mortgage Pools having  a variable, as opposed to a fixed,
Pass-Through Rate. A  Mortgage Pool  with a  variable Pass-Through  Rate may  be
composed  of Mortgage Loans that have  adjustable Mortgage Interest Rates, or of
Mortgage Loans with  fixed Mortgage Interest  Rates if the  amount to be  passed
through  is determined on a Mortgage Loan-by-Mortgage Loan basis as the Mortgage
Interest  Rate   minus  specified   fees   for  servicing   and   administrative
compensation,  which may include any of  the Servicing Fee, the Master Servicing
Fee and the Certificate Administrator Fee,  for each such Mortgage Loan, as  set
forth  in the Prospectus Supplement, or  as otherwise determined as described in
the applicable Prospectus  Supplement. Because the  Mortgage Interest Rates  may
vary  in such a Mortgage Pool, and the servicing and administrative compensation
generally  will  be   fixed,  the   Pass-Through  Rate  will   be  affected   by
disproportionate  principal prepayments  among Mortgage  Loans bearing different
Mortgage   Interest   Rates   and,   consequently,   the   yield   to   maturity
Certificateholders   will  be   affected.  The   characteristics  of   any  such
variable-rate Mortgage  Pools will  be described  in the  applicable  Prospectus
Supplement.  Although  Mortgage  Interest  Rates in  a  fixed  Pass-Through Rate
Mortgage Pool may  vary from  Mortgage Loan to  Mortgage Loan,  disproportionate
principal  prepayments  among  the  Mortgage  Loans  bearing  different Mortgage
Interest Rates will not affect the return to Certificateholders.
 
    For  any  Series  of  Certificates,  the  effective  yield  to  maturity  to
Certificateholders  generally will be slightly lower  than the yield to maturity
otherwise produced by the applicable  Pass-Through Rate because, while  interest
will  accrue  on  each Mortgage  Loan  from the  first  day of  each  month, the
distribution  of  such   interest  to  Certificateholders   at  the   applicable
Pass-Through Rate generally will be made on a later day, which, unless otherwise
specified  in the applicable Prospectus Supplement, will be the 25th day (or, if
such day is not a business day,  the next succeeding business day) of the  month
following the month of accrual.
 
    When  a prepayment in full (a "Payoff") is made by a Mortgagor on a Mortgage
Loan during a month, the Mortgagor is charged interest on the days in the  month
actually  elapsed  up to  the  date of  the Payoff  at  the daily  interest rate
(determined by dividing the Mortgage Interest Rate by 365, or 360 in the case of
Payoffs received on a date on which  the monthly payment for such Mortgage  Loan
is  due (a "Due Date")) which is applied to the principal amount of the Mortgage
Loan so prepaid. Similarly, when a Mortgage Loan is liquidated under a  Mortgage
Pool  Insurance Policy during a month, the pool insurer will pay interest on the
Mortgage Loan  only  to  the date  the  claim  is paid.  Also,  when  a  partial
 
                                       15
<PAGE>
principal  prepayment (a "Curtailment") is made on a Mortgage Loan together with
the scheduled Monthly Payment for a month on or after the related Due Date,  the
Mortgagor   does  not  pay  interest  on   the  prepaid  amount,  and  therefore
Certificateholders will not receive any interest on such prepaid amount.
 
    Unless otherwise specified in the  applicable Prospectus Supplement, to  the
extent  that Compensating Interest (as defined below) is not paid, the effect of
a Payoff or such a liquidation will be to reduce slightly the amount of interest
passed through on the next Distribution Date, because interest on the  principal
amount  of the Mortgage Loan so prepaid was paid only to the date of such Payoff
or liquidation and not to the end  of the month of prepayment. Unless  otherwise
specified  in the  applicable Prospectus  Supplement, the  following will apply:
Payoffs received  during the  period from  the  first day  of a  calendar  month
through  the 14th day of such month will be passed through, without Compensating
Interest and without interest accrued  from the first day  of such month to  the
date of the Payoff, on the Distribution Date in such month, and Payoffs received
during  the period from the 15th day of a calendar month through the last day of
such month will be passed through, with Compensating Interest and with  interest
at  the applicable Pass-Through  Rate attributable to  interest paid through the
date of the Payoff by the Mortgagors  on the Distribution Date in the  following
month.  Proceeds of  Mortgage Loans liquidated  under a  Mortgage Pool Insurance
Policy during a  month will be  passed through, with  Compensating Interest  and
interest  at the applicable  Pass-Through Rate attributable  to interest paid by
the pool insurer  under an  applicable Mortgage  Pool Insurance  Policy, on  the
Distribution Date in the following month.
 
    Unless  otherwise  specified in  the  applicable Prospectus  Supplement, the
following will apply:  "Compensating Interest"  will consist of  a full  month's
payment  of interest at the applicable Pass-Through  Rate on a Mortgage Loan for
which a  Payoff  is made  or  which is  liquidated,  less the  interest  at  the
applicable  Pass-Through Rate attributable to interest  paid by the Mortgagor or
by the pool insurer under an  applicable Mortgage Pool Insurance Policy  through
the  date of Payoff. Compensating Interest  on liquidated Mortgage Loans will be
passed  through  to  Certificateholders,  together  with  any  interest  at  the
applicable  Pass-Through Rate attributable to interest  paid by the pool insurer
under any applicable Mortgage Pool Insurance  Policy to the date of  liquidation
on  the  Distribution  Date  of the  month  following  liquidation. Compensating
Interest on Payoffs will  be paid on  a Distribution Date  only with respect  to
Payoffs  received during the period from the  15th day of the preceding calendar
month through the last day of  such preceding month. The applicable Pooling  and
Servicing  Agreement will specify any limitations on  the extent of or source of
funds available for payments of Compensating Interest.
 
               MATURITY, AVERAGE LIFE AND PREPAYMENT ASSUMPTIONS
 
    The Mortgage Loans at origination will have varying maturities as more fully
described in the applicable Prospectus Supplement. The Company expects that most
such Mortgage Loans will have maturities at origination of either 10 to 15 years
or 20 to 30 years and that such Mortgage Loans may be prepaid in full or in part
at any time, generally  without penalty. The  prepayment experience will  affect
the lives of the Certificates. The Company anticipates that a substantial number
of Mortgage Loans will be paid in full prior to their scheduled maturity.
 
    A  number  of factors,  including  homeowner mobility,  economic conditions,
enforceability of  "due-on-sale" clauses,  assumability of  the Mortgage  Loans,
mortgage  market interest rates  and the general  availability of mortgage funds
affect prepayment experience.  Generally, each Mortgage  executed in  connection
with  a  fixed-rate  Mortgage  Loan,  except  for  FHA-insured  or VA-guaranteed
Mortgage Loans, will contain "due-on-sale"  provisions permitting the holder  of
the  Mortgage  Note  to  accelerate  the  maturity  of  the  Mortgage  Loan upon
conveyance by the Mortgagor of  the underlying Mortgaged Property. With  respect
to  Series of Certificates as to which  the Company will act as Master Servicer,
the Master Servicer will  agree that it or  the applicable Seller/Servicer  will
enforce any "due-on-sale" clause contained in any such Mortgage to the extent it
has  knowledge  of  the  conveyance or  proposed  conveyance  of  the underlying
Mortgaged Property and reasonably  believes that it is  entitled to do so  under
applicable  law; provided,  however, that  neither the  Master Servicer  nor the
Seller/Servicer will  take any  action in  relation to  the enforcement  of  any
"due-on-sale"  provision which would  impair or threaten  to impair any recovery
under any related Primary  Insurance Policy or  Mortgage Pool Insurance  Policy.
With  respect to Series of Certificates as to  which the Company will not act as
Master
 
                                       16
<PAGE>
Servicer, the Servicer  will agree to  enforce any "due-on-sale"  clause in  the
instances  and to  the extent  described in  the preceding  sentence. However, a
Mortgage  Pool  may  contain  fixed-rate  Mortgage  Loans  which  will  allow  a
subsequent  owner of a Mortgaged Property,  if credit underwriting standards are
met, to  assume  such  fixed-rate  Mortgage  Loan  without  enforcement  of  any
"due-on-sale" clause. With respect to Mortgage Loans bearing adjustable Mortgage
Interest Rates, unless otherwise specified in the related Prospectus Supplement,
the  related  Mortgages  will generally  provide  that such  Mortgage  Loans are
assumable by creditworthy  subsequent owners  without enforcement  of any  "due-
on-sale"  clause.  An assumption  of  a Mortgage  Loan  may have  the  effect of
increasing the life of such Mortgage Loan.
 
    "Weighted average  life" refers  to the  average amount  of time  that  will
elapse from the date of issuance of a Certificate until each dollar of principal
will  be  repaid to  the Certificateholders.  The weighted  average life  of the
Certificates will be influenced by the  rate at which principal on the  Mortgage
Loans  in the Mortgage Pool is  paid, which may be in  the form of (i) scheduled
amortization  or  (ii)   Curtailments  and   Payoffs  (collectively   "Principal
Prepayments").  Based  upon published  information, the  rate of  prepayments on
fixed- and adjustable-rate  conventional one-to four-family  mortgage loans  has
fluctuated  significantly in recent years. The Company believes such fluctuation
is due to a number  of factors, including those  discussed above, and that  such
factors  will also affect the prepayment experience on the Mortgage Loans in any
Mortgage Pool. Accordingly,  the Company cannot  predict what future  prepayment
experience  will  be  or what  the  resulting  weighted average  life  might be.
However, principal prepayments on mortgage loans are commonly measured  relative
to a prepayment standard or model. The model used in this Prospectus and in each
Prospectus Supplement, unless otherwise indicated therein (the "Basic Prepayment
Assumption"  or  "BPA"), represents  an assumed  rate  of prepayment  each month
relative to the  then outstanding principal  balance of a  pool of new  Mortgage
Loans.  The  BPA  assumes  prepayment  rates  of  0.2%  per  annum  of  the then
outstanding principal balance of such Mortgage  Loans in the first month of  the
life  of  the Mortgage  Loans and  an additional  0.2% per  annum in  each month
thereafter until the 30th month. Beginning in  the 30th month and in each  month
thereafter  during the life of the Mortgage Loans, such prepayment model assumes
a constant prepayment rate of 6.0% per annum. Varying prepayment assumptions are
often expressed as percentages  of the BPA  (E.G., at 150%  of the BPA,  assumed
prepayments during the first month of a pool would be 0.3% per annum, each month
thereafter  the rate of prepayments would increase by 0.3% per annum, and in the
30th and  succeeding months  the rate  would be  9% per  annum). The  Prospectus
Supplement  or Current Report  on Form 8-K  for each Series  of Certificates may
contain a table setting forth the projected weighted average life of each  Class
of  Certificates of  such Series  and the  percentage of  the original principal
amounts or  notional  principal  amounts  of  each  such  Class  that  would  be
outstanding  on  specified  Distribution Dates  for  such Series,  based  on the
assumptions set forth with respect to the BPA deemed appropriate by the  Company
and specified therein.
 
                                  THE COMPANY
 
    The  Company, a Delaware corporation,  is a wholly-owned indirect subsidiary
of PNC Bank Corp.,  a bank holding  company. The Company  was organized for  the
purpose   of  providing  mortgage  lending  institutions,  including  affiliated
institutions, with  greater  financing  and lending  flexibility  by  purchasing
mortgage  loans from  such institutions and  issuing mortgage-backed securities.
The Company's principal executive offices are located at 75 North Fairway Drive,
Vernon Hills, Illinois 60061, telephone (847) 549-6500.
 
MORTGAGE PURCHASE PROGRAM
 
    Set forth below is a description  of the principal aspects of the  Company's
purchase  program for Mortgage Loans eligible  for inclusion in a Mortgage Pool.
The Company will represent  and warrant to the  Trustee that each Mortgage  Pool
will  consist  of  Mortgage  Loans  purchased  from  one  or  more  institutions
("Sellers") which  are (i)  state-chartered or  federally-chartered savings  and
loan  associations, banks  or similar  financial institutions  whose deposits or
accounts are insured by the  Federal Deposit Insurance Corporation ("FDIC")  or,
if  specified in the applicable Prospectus  Supplement or Current Report on Form
8-K, substantially similar deposit insurance  approved by any applicable  rating
agency,  (ii)  approved as  mortgagees by  the FHA  ("FHA-Approved Mortgagees"),
(iii)  approved  by  the  Federal  National  Mortgage  Association  ("FNMA")  as
mortgagees ("FNMA-
 
                                       17
<PAGE>
Approved Mortgagees") or by the Federal Home Loan Mortgage Corporation ("FHLMC")
as  mortgagees ("FHLMC-Approved Mortgagees"), or any successor entity to either,
(iv)  assignees  of   FHA-Approved  Mortgagees,   FNMA-Approved  Mortgagees   or
FHLMC-Approved  Mortgagees, (v)  the FDIC  or the  Resolution Trust Corporation,
(vi) entities which have purchased Mortgage Loans from institutions described in
clauses (i)-(v) above or (vii)  such other entities as  may be described in  the
applicable  Prospectus Supplement. The institutions described in clauses (i)-(v)
of the preceding sentence will collectively be referred to herein as  "Lenders".
The  Company has approved (or will  approve) individual institutions as eligible
Lenders by applying certain criteria,  including the Lender's depth of  mortgage
origination   experience,  servicing  experience  and  financial  stability.  In
general,  each  Lender  must  have  experience  in  originating  and   servicing
conventional  residential mortgages and must have  a net worth acceptable to the
Company. Each Lender is required to use the services of qualified  underwriters,
appraisers  and attorneys. Other  factors evaluated by  the Company in approving
Lenders include delinquency and foreclosure ratio performances.
 
LOAN STANDARDS
 
    The Mortgage Loans to be included in  each Mortgage Pool will be loans  with
fixed or adjustable rates of interest secured by first mortgages, deeds of trust
or  security deeds  on residential  properties with  original principal balances
which did not exceed 95% of the  value of the Mortgaged Properties, unless  such
loans  are FHA-insured or VA-guaranteed. Generally,  each Mortgage Loan having a
loan-to-value ratio at origination and as of  the Cut-Off Date in excess of  80%
or  which is secured by a  second or vacation home will  be covered by a Primary
Insurance Policy, FHA Insurance Policy  or VA Guaranty insuring against  default
all  or  a  specified portion  of  the  principal amount  thereof.  See "Primary
Insurance, FHA  Mortgage  Insurance,  VA Mortgage  Guaranty,  Hazard  Insurance;
Claims  Thereunder". Each mortgage insurer must  be a Qualified Insurer (defined
herein to mean a mortgage guaranty insurance company which is duly qualified  as
such under the laws of each state in which the Mortgaged Properties are located,
duly  authorized and  licensed in  such states  to transact  a mortgage guaranty
insurance business and to write the insurance provided by the Primary  Insurance
Policy  or the Mortgage Pool Insurance Policy, as  the case may be, and which is
approved as an insurer by FHLMC, FNMA or any successor entity to either, and  by
the Company).
 
    The  Mortgage Loans to  be included in  each Mortgage Pool  will be "one- to
four-family"  mortgage  loans,  which  means  permanent  loans  (as  opposed  to
construction  or  land  development  loans)  secured  by  Mortgages  on non-farm
properties, including  attached  or detached  single-family  or  second/vacation
homes,  two-to four-family primary residences and condominiums or other attached
dwelling units, including  individual condominiums, row  houses, townhouses  and
other  separate dwelling units even when located in buildings containing five or
more such units. Each Mortgage Loan must be secured by an owner occupied primary
residence or  second/vacation home,  or by  a nonowner  occupied residence.  The
Mortgaged Property may not be a mobile home.
 
CREDIT, APPRAISAL AND UNDERWRITING STANDARDS
 
    The  Mortgage Loans to be included in  each Mortgage Pool will be subject to
the various credit, appraisal and  underwriting standards described herein.  The
Company's  credit, appraisal and underwriting  standards with respect to certain
Mortgage Loans  will  generally conform  to  those published  in  the  Company's
Selling  Guide (together  with the  Company's Servicing  Guide, the  "Guide", as
modified from time to time). The credit, appraisal and underwriting standards as
set forth  in the  Guide are  continuously revised  based on  opportunities  and
prevailing  conditions in the residential mortgage market and the market for the
Company's  mortgage  pass-through  certificates.  The  Mortgage  Loans  may   be
underwritten by the Company or by designated third parties.
 
    In addition, the Company may purchase Mortgage Loans which do not conform to
the  underwriting standards set forth  in the Guide. Such  Mortgage Loans may be
purchased in negotiated transactions  from Sellers who  will represent that  the
Mortgage  Loans have  been originated in  accordance with  credit, appraisal and
underwriting standards  agreed to  by the  Company. The  Company will  generally
review  only a  limited portion of  the Mortgage  Loans in any  delivery of such
Mortgage  Loans  for  conformity  with  the  applicable  credit,  appraisal  and
underwriting  standards.  Certain other  Mortgage Loans  will be  purchased from
Sellers who will represent that the  Mortgage Loans were originated pursuant  to
credit,    appraisal    and    underwriting    standards    determined    by   a
 
                                       18
<PAGE>
mortgage insurance company acceptable to the Company. The Company will accept  a
certification  from such insurance company as  to a Mortgage Loan's insurability
in a  mortgage pool  as  of the  date of  certification  as evidence  that  such
Mortgage Loan conforms to applicable underwriting standards. Such certifications
will  likely have been issued  before the purchase of  the Mortgage Loans by the
Company. The  Company will  perform  only random  quality assurance  reviews  on
Mortgage Loans delivered with such certifications.
 
    The  credit,  appraisal and  underwriting  standards utilized  in negotiated
transactions and the credit, appraisal  and underwriting standards of  insurance
companies issuing certificates may vary substantially from the credit, appraisal
and  underwriting standards set forth in the Guide. All of the credit, appraisal
and  underwriting  standards  will   provide  an  underwriter  with   sufficient
information to evaluate the borrower's repayment ability and the adequacy of the
Mortgaged  Property as collateral. Due to  the variety of underwriting standards
and review procedures that may be  applicable to the Mortgage Loans included  in
any  Mortgage Pool, the related Prospectus Supplement will not distinguish among
the various  credit,  appraisal and  underwriting  standards applicable  to  the
Mortgage  Loans nor describe  any review for  compliance with applicable credit,
appraisal and underwriting standards performed  by the Company. Moreover,  there
can  be no assurance that every Mortgage  Loan was originated in conformity with
the applicable  credit, appraisal  and underwriting  standards in  all  material
respects,  or that  the quality  or performance  of Mortgage  Loans underwritten
pursuant to varying standards  as described above will  be equivalent under  all
circumstances.
 
    The   Company's  underwriting   standards  are  intended   to  evaluate  the
prospective Mortgagor's credit standing and repayment ability, and the value and
adequacy  of  the  proposed  Mortgaged  Property  as  collateral.  In  the  loan
application   process,  prospective  Mortgagors  will  be  required  to  provide
information regarding such factors as their assets, liabilities, income,  credit
history,  employment history and other related items. Each prospective Mortgagor
will also provide an authorization to apply for a credit report which summarizes
the Mortgagor's credit  history. With  respect to  establishing the  prospective
Mortgagor's  ability to make timely payments,  the Company will require evidence
regarding the Mortgagor's employment and income,  and of the amount of  deposits
made  to financial institutions where the  Mortgagor maintains demand or savings
accounts. In  some  instances, Mortgage  Loans  which were  originated  under  a
Limited  Documentation Origination  Program may  be sold  to the  Company. For a
mortgage loan originated  under a Limited  Documentation Origination Program  to
qualify  for purchase by the Company, the prospective mortgagor must have a good
credit history and be financially capable of making a larger cash down  payment,
in  a purchase,  or be  willing to  finance less  of the  appraised value,  in a
refinancing, than would  otherwise be  required by the  Company. Currently,  the
Company's  underwriting standards provide that  only mortgage loans with certain
loan-to-value ratios will qualify for purchase. If the mortgage loan  qualifies,
the  Company  waives  some  of  its  documentation  requirements  and eliminates
verification of income and employment for the prospective mortgagor.
 
    The Company's underwriting standards generally follow guidelines  acceptable
to FNMA and FHLMC. In determining the adequacy of the property as collateral, an
independent  appraisal is  made of each  property considered  for financing. The
appraiser is required  to inspect the  property and  verify that it  is in  good
condition  and that construction,  if new, has been  completed. The appraisal is
based on the appraiser's judgment of  values, giving appropriate weight to  both
the market value of comparable homes and the cost of replacing the property.
 
    Certain   states  where  the   Mortgaged  Properties  may   be  located  are
"anti-deficiency" states where, in general, lenders providing credit on one-  to
four-family  properties must  look solely to  the property for  repayment in the
event  of   foreclosure.   See   "Certain  Legal   Aspects   of   the   Mortgage
Loans--Anti-Deficiency  Legislation  and  Other  Limitations  on  Lenders."  The
Company's  underwriting  standards  in  all  states  (including  anti-deficiency
states)  require that the  underwriting officers be satisfied  that the value of
the  property  being  financed,  as  indicated  by  the  independent  appraisal,
currently  supports and is anticipated to  support in the future the outstanding
loan balance, and provides sufficient value  to mitigate the effects of  adverse
shifts in real estate values.
 
                                       19
<PAGE>
SELLER WARRANTIES AND INDEMNIFICATION OF THE COMPANY
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, each Seller generally will make representations and  warranties
with  respect to Mortgage Loans  sold by it to the  Company for inclusion in the
Trust Fund  which  the  Company  deems  sufficient to  permit  it  to  make  its
representations  and warranties in respect of such Mortgage Loans to the Trustee
and the  Certificateholders under  the Pooling  Agreement. See  "Description  of
Certificates--Representations  and Warranties" below. Each Seller will also make
certain other representations  and warranties regarding  Mortgage Loans sold  by
it.  Upon the  breach of any  representation or  warranty made by  a Seller that
materially and adversely  affects the  interests of the  Certificateholder in  a
Mortgage Loan (other than those breaches which have been cured), the Company may
require  the Seller to  repurchase the related Mortgage  Loan. In addition, each
Seller will  agree  to indemnify  the  Company  against any  loss  or  liability
incurred  by  the Company  on account  of  any breach  of any  representation or
warranty made by the Seller, any failure  to disclose any matter that makes  any
such  representation and warranty  misleading, or any  inaccuracy in information
furnished by the Seller to the  Company, including any information set forth  in
this   Prospectus  or  in   any  Prospectus  Supplement.   See  "Description  of
Certificates--Assignment  of   Mortgage   Loans"  and   "--Representations   and
Warranties".
 
    With  respect to Series of Certificates as to which the Company will not act
as Master Servicer, the Seller which sold the Mortgage Loans to the Company  for
inclusion  in the  Trust Fund  will make  representations and  warranties to the
Company with respect to  such Mortgage Loans, and  the Company will assign  such
representations  and warranties to the  Trustee and the Certificateholders under
the Pooling Agreement. Upon the breach of any representation or warranty made by
such  Seller  that  materially  and  adversely  affects  the  interests  of  the
Certificateholder  in a Mortgage Loan (other than those breaches which have been
cured), the Seller will be required to repurchase the related Mortgage Loan. See
"Description   of    Certificates--Assignment    of    Mortgage    Loans"    and
"--Representations and Warranties".
 
RELATIONSHIPS WITH AFFILIATES
 
    PNC Mortgage Corp. of America, an affiliate of the Company, may be a Seller,
a  Seller/Servicer  or  a Servicer.  Two  of  the Company's  directors  are also
directors of PNC Mortgage Corp. of America.
 
                          DESCRIPTION OF CERTIFICATES
 
    Each Series of Certificates  will be issued pursuant  to a separate  Pooling
Agreement.  With respect to Series of Certificates  as to which the Company will
act as Master Servicer,  the Pooling Agreement will  be between the Company,  as
Depositor  and  Master  Servicer,  and  the  Trustee  named  in  the  Prospectus
Supplement, and the Mortgage Loans will be serviced by Seller/Servicers pursuant
to selling and servicing contracts  ("Selling and Servicing Contracts")  between
the Company and such Seller/Servicers, or will be serviced by servicers pursuant
to  servicing arrangements  approved by the  Company. With respect  to Series of
Certificates as  to which  the Company  will  not act  as Master  Servicer,  the
Pooling  Agreement  will  be among  the  Company, as  Depositor  and Certificate
Administrator, the Servicer and the Trustee named in the Prospectus  Supplement.
A form of Pooling Agreement and a form of the Selling and Servicing Contract are
filed  as exhibits to the  Registration Statement of which  this Prospectus is a
part. The  following discussion  summarizes certain  provisions expected  to  be
contained  in each  Pooling Agreement which  governs the  Trust Funds consisting
principally of  one-  to-four  family  residential  properties.  The  applicable
Prospectus  Supplement will  describe material  features of  the related Pooling
Agreement, which may  differ from  the features described  below. The  following
summary  and the summary contained in a  Prospectus Supplement do not purport to
be complete and are subject to, and are qualified in their entirety by reference
to, all of the  provisions of the Pooling  Agreement for each particular  Series
and of the applicable Selling and Servicing Contracts or similar contracts.
 
GENERAL
 
    The  Certificates of each  Series will represent  undivided interests in the
Trust Fund created pursuant to the Pooling Agreement for such Series. The  Trust
Fund  for  each Series  will  consist, to  the  extent provided  in  the Pooling
Agreement, of  (i)  such  Mortgage  Loans  as from  time  to  time  are  subject
 
                                       20
<PAGE>
to  the Pooling  Agreement (exclusive of  any related  Retained Yield (described
below), except as  otherwise specified  in the  related Prospectus  Supplement),
(ii)  such  assets as  from time  to time  are held  in the  Certificate Account
(described below) and the Custodial  Accounts for P&I (described below)  related
to  such Mortgage  Loans (exclusive of  any Retained Yield,  except as otherwise
specified in  the related  Prospectus Supplement),  (iii) property  acquired  by
foreclosure  of  Mortgage  Loans  or  deed  in  lieu  of  foreclosure,  (iv) any
combination, as specified in the related  Prospectus Supplement, of a Letter  of
Credit,  Mortgage  Pool  Insurance  Policy,  Special  Hazard  Insurance  Policy,
Bankruptcy Bond, Fraud Bond, Reserve Fund or other type of credit enhancement as
described  under  "Description   of  Credit  Enhancements",   (v)  the   Private
Certificates  and  Agency  Certificates,  if any,  described  in  the applicable
Prospectus Supplement, and (vi) such other assets or rights as are described  in
the  applicable  Prospectus  Supplement.  If  so  specified  in  the  applicable
Prospectus Supplement, Certificates of a given  Series may be issued in  several
Classes,  which may  pay interest  at different  rates, may  represent different
allocations of the right to receive principal and interest, and certain of which
may be subordinated to others. Any  such Class of Certificates may also  provide
for payments of principal only or interest only or for disproportionate payments
of   principal  and  interest.  Subordinated  Classes   of  a  given  Series  of
Certificates may or may not be offered by the same Prospectus Supplement as  the
senior Classes of such Series.
 
    The   Certificates  will   be  freely  transferable   and  exchangeable  for
Certificates of  the same  Series and  Class at  the office  set forth  in  such
Certificates,  provided, however,  that certain  Classes of  Certificates may be
subject to transfer restrictions set forth in such Certificates and described in
the applicable Prospectus Supplement. A reasonable service charge may be imposed
for any registration of  exchange or transfer of  Certificates, and the  Company
may  require payment of a sum sufficient  to cover any tax or other governmental
charge. If  specified  in the  applicable  Prospectus Supplement,  one  or  more
Classes  of Certificates for any Series may be transferable only on the books of
The Depository Trust Company or another depository identified in such Prospectus
Supplement.
 
    Unless  otherwise  indicated  in   the  applicable  Prospectus   Supplement,
beginning  with the month following  the month in which  the Cut-Off Date occurs
for a Series of Certificates, distributions of principal and interest (or, where
applicable, principal only or interest only) on each Class of Certificates  will
be  made  either  by  the  Trustee,  the  Master  Servicer  or  the  Certificate
Administrator, as applicable, acting on behalf of the Trustee or a paying  agent
appointed  by the Trustee (the "Paying Agent") on  the 25th day (or if such 25th
day is not a business day, the business day immediately following such 25th day)
of each calendar month (the "Distribution  Date") to the persons in whose  names
the  Certificates are registered at  the close of business  on the last business
day of the month preceding the month in which the Distribution Date occurs  (the
"Record  Date"). Distributions for each Series will  be made by wire transfer in
immediately available funds  for the  account of, or  by check  mailed to,  each
Certificateholder of record; provided, however, that, unless otherwise specified
in  the related Prospectus  Supplement, the final  distribution in retirement of
the Certificates for each Class of a Series will be made only upon  presentation
and  surrender of the Certificates at the office or agency of the Company or the
Trustee  specified  in   the  notice   to  Certificateholders   of  such   final
distribution.
 
ASSIGNMENT OF MORTGAGE LOANS
 
    The  Company will cause  the Mortgage Loans  to be assigned  to the Trustee,
together with  all principal  and  interest on  the  Mortgage Loans  other  than
principal  and interest  due on  or before  the Cut-Off  Date. The  Company will
expressly reserve its or a Seller's rights  in and to any Retained Yield,  which
accordingly  will  not  constitute part  of  the  Trust Fund.  In  addition, the
applicable Prospectus Supplement  may specify  that the Seller  will retain  the
right  to a  specified portion  of either  principal or  interest, or  both. The
Trustee will, concurrently  with such assignment,  authenticate and deliver  the
Certificates  or cause the Certificates to be authenticated and delivered to the
Company or its designated  agent in exchange for  the Trust Fund. Each  Mortgage
Loan  will be identified  in a schedule  appearing as an  exhibit to the Pooling
Agreement for  the related  Series. Unless  otherwise specified  in the  related
Prospectus Supplement, such schedule will include information as of the close of
business  on the Cut-Off Date as to the principal balance of each Mortgage Loan,
the Mortgage Interest Rate
 
                                       21
<PAGE>
and the maturity of each Mortgage Note, the Seller/Servicer's or the  Servicer's
Servicing  Fee, whether  a Primary Insurance  Policy has been  obtained for each
Mortgage Loan and the  then-current scheduled monthly  payment of principal  and
interest for each Mortgage Loan.
 
    In addition, the Company will, as to each Mortgage Loan, deliver or cause to
be  delivered to the Trustee the Mortgage  Note, an assignment to the Trustee of
the Mortgage in  a form for  recording or filing  as may be  appropriate in  the
state  where the Mortgaged  Property is located,  the original recorded Mortgage
with evidence of  recording or  filing indicated thereon,  a copy  of the  title
insurance  policy  or  other  evidence  of title  and  evidence  of  any Primary
Insurance Policy, FHA Insurance Policy or VA Guaranty for such Mortgage Loan, if
applicable; or, in the  case of each Cooperative  Loan, the related  Cooperative
Note,  the  original  security  agreement, the  proprietary  lease  or occupancy
agreement, the related stock certificate and  related blank stock powers, and  a
copy of the original filed financing statement together with assignments thereof
from  the applicable Seller to  the Trustee in a  form sufficient for filing. In
certain instances where original documents respecting a Mortgage Loan may not be
available prior to execution of the Pooling Agreement, the Company will  deliver
such  documents to the  Trustee within 270  days thereafter. Notwithstanding the
foregoing, a Trust Fund may include  Mortgage Loans where the original  Mortgage
Note  is not delivered to the Trustee if  the Company delivers to the Trustee or
the custodian a copy or a duplicate original of the Mortgage Note, together with
an affidavit certifying that  the original thereof has  been lost or  destroyed.
With  respect to such  Mortgage Loans, the  Trustee (or its  nominee) may not be
able to enforce the Mortgage Note against the related borrower. The Company will
agree  to  repurchase  or  substitute  for  such  a  Mortgage  Loan  in  certain
circumstances    (see   "Description    of   Certificates--Representations   and
Warranties").
 
    The Trustee will  review the mortgage  documents within 45  days of  receipt
thereof to ascertain that all required documents have been properly executed and
received.  The Trustee will hold such documents for each Series in trust for the
benefit of  Certificateholders  of  such  Series.  With  respect  to  Series  of
Certificates  as  to which  the  Company will  act  as Master  Servicer,  if any
document is found by the Trustee not to have been properly executed or  received
or  to be unrelated to  the Mortgage Loans identified  in the Pooling Agreement,
and the  Company cannot  cure such  defect, the  Company will  substitute a  new
mortgage  loan meeting  the conditions set  forth in the  Pooling Agreement (see
"--Substitution of Mortgage  Loans" below)  or repurchase  the related  Mortgage
Loan  from the  Trustee at a  price equal  to 100% of  the outstanding principal
balance of such Mortgage Loan, plus  accrued interest thereon at the  applicable
Pass-Through  Rate through the  last day of  the month of  such repurchase. With
respect to Series of Certificates as to which the Company will not act as Master
Servicer, if  a  defect of  the  type described  in  the preceding  sentence  is
discovered  by the Trustee  and cannot be  cured by the  Seller, the Seller will
substitute a new mortgage loan or repurchase the related Mortgage Loan from  the
Trustee  upon the terms described in  the preceding sentence. The purchase price
of any Mortgage Loan so repurchased will be passed through to Certificateholders
as liquidation  proceeds  in  accordance with  the  procedures  specified  under
"--Distributions  on Certificates".  This substitution  or repurchase obligation
constitutes the sole remedy available  to the Certificateholders or the  Trustee
for such a defect in a constituent document.
 
    An assignment of each Mortgage Loan to the Trustee will be recorded or filed
except  in states where, in the written  opinion of counsel admitted to practice
in such  state  acceptable  to the  Company  and  the Trustee,  such  filing  or
recording is not required to protect the Trustee's interest in the Mortgage Loan
against  sale, further assignment, satisfaction or  discharge by the Seller, the
Seller/ Servicers, the Servicer, the Company or the Master Servicer.
 
    Buydown Funds provided by the Sellers or other parties for any Buydown Loans
included in a Mortgage Pool will be  (a) deposited on the date of settlement  of
the  sale of the  Certificates to the original  purchasers thereof (the "Closing
Date") into a separate  account (the "Buydown Fund  Account") maintained with  a
bank  or trust company specified in  the related Prospectus Supplement, (b) held
and monitored by the Seller/Servicers or the Servicer, as applicable, in insured
Buydown Fund Accounts or (c) held  in Custodial Accounts for P&I. Since  Buydown
Funds  may be  funded at either  the par  values of future  payment subsidies or
funded in an amount  less than the  par values of  future payment subsidies  and
determined   by  discounting  such  par   values  in  accordance  with  interest
 
                                       22
<PAGE>
accruing on such values,  Buydown Fund Accounts  may be non-interest-bearing  or
may  bear interest. In no event will the amount held in any Buydown Fund Account
exceed the level of deposit  insurance covering such account. Accordingly,  more
than one such account may be established.
 
SUBSTITUTION OF MORTGAGE LOANS
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, the  Company may  substitute an  eligible mortgage  loan for  a
defective  Mortgage Loan in lieu of repurchasing such defective Mortgage Loan or
the related Mortgaged Property  (a) within three months  after the Closing  Date
for  the related  Series of  Certificates, and (b)  within two  years after such
Closing Date, if the  related Mortgage Loan is  a "defective obligation"  within
the  meaning of Section 860G(a)(4)(A)(ii) of the  Code. Any mortgage loan, to be
eligible for  substitution,  must fit  within  the general  description  of  the
Mortgage  Loans set forth herein and  in the related Prospectus Supplement. With
respect to Series of Certificates as to which the Company will not act as Master
Servicer, the Seller  or the Servicer,  as specified in  the related  Prospectus
Supplement,  may substitute an  eligible mortgage loan  for a defective Mortgage
Loan in  lieu  of repurchasing  such  defective  Mortgage Loan  or  the  related
Mortgaged  Property in the circumstances and to  the extent described in the two
preceding sentences. See "The Mortgage Pools".
 
REPRESENTATIONS AND WARRANTIES
 
    In the Pooling  Agreement for each  Series of Certificates  as to which  the
Company  will act as Master Servicer,  unless otherwise stated in the applicable
Prospectus Supplement, the Company  will represent and  warrant to the  Trustee,
among  other  things, that  (i) the  information  set forth  in the  schedule of
Mortgage Loans is true and correct in all material respects; (ii) except in  the
case  of  Cooperative  Loans, a  lender's  title policy  (or  other satisfactory
evidence of title) was issued  on the date of  the origination of each  Mortgage
Loan  and each such  policy or other evidence  of title is  valid and remains in
full force and effect; (iii) if a Primary Insurance Policy, FHA Insurance Policy
or VA Guaranty is required  with respect to such  Mortgage Loan, such policy  or
guaranty  is valid and remains in full force  and effect as of the Closing Date;
(iv) as of the Closing  Date, the Company had good  title to the Mortgage  Loans
and  the Mortgage  Notes are subject  to no offsets,  defenses or counterclaims,
except to the  extent that  the buydown agreement  for a  Buydown Loan  forgives
certain  indebtedness  of a  Mortgagor; (v)  except in  the case  of Cooperative
Loans, as  of the  Closing Date,  each  Mortgage is  a valid  first lien  on  an
unencumbered  estate  in  fee  simple or  leasehold  interest  in  the 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 of such
Mortgage, such  exceptions  appearing of  record  being acceptable  to  mortgage
lending  institutions  generally  or  specifically  reflected  in  the  mortgage
originator's appraisal, (c) exceptions set  forth in the title insurance  policy
covering  such Mortgaged Property 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); (vi) as of the Closing Date,
each Mortgaged Property  is free of  damage and  is in good  repair, except  for
ordinary  wear and tear; (vii) as of the time each Mortgage Loan was originated,
the Mortgage Loan complies with all applicable state and federal laws, including
usury, equal credit opportunity, disclosure and recording laws; (viii) as of the
Closing Date,  there are  no  delinquent tax  or  assessment liens  against  any
Mortgaged   Property;  and  (ix)  unless  otherwise  specified  in  the  related
Prospectus Supplement, each Mortgage Loan was originated and will be serviced by
(a) an  institution which  is a  member of  the Federal  Reserve System  or  the
deposits  of which are insured by the FDIC, (b) an institution which is a member
of the Federal Home Loan Bank System, (c) an institution which is a FHA-Approved
Mortgagee, (d) an  institution which  is a  FNMA-Approved Mortgagee,  or (e)  an
institution  which  is  a FHLMC-Approved  Mortgagee.  The  applicable Prospectus
Supplement and Pooling  Agreement may set  forth additional representations  and
warranties  of the Company. In addition, with respect to any Mortgage Loan as to
which the  Company  delivers  to  the Trustee  or  the  custodian  an  affidavit
certifying  that the original Mortgage Note has  been lost or destroyed, if such
Mortgage Loan subsequently is in default  and the enforcement thereof or of  the
related Mortgage is materially adversely affected by the absence of the original
Mortgage  Note, the  Company will be  obligated to repurchase  or substitute for
such Mortgage
 
                                       23
<PAGE>
Loan in the manner described below. However, the Company will not be required to
repurchase or  substitute  for any  Mortgage  Loan  as described  above  if  the
circumstances  giving  rise to  such requirement  also  constitute fraud  in the
origination of the related Mortgage Loan.
 
    If  the  Mortgage  Loans  include  Cooperative  Loans,  representations  and
warranties  with  respect to  title insurance  or hazard  insurance will  not be
given. Generally, a  Cooperative itself  is responsible for  the maintenance  of
hazard  insurance  for property  owned by  such  Cooperative, and  the borrowers
(tenant-stockholders) of such  Cooperative do not  maintain hazard insurance  on
their individual dwelling units. Title insurance is not obtained for Cooperative
Loans  because such loans are  not secured by real  property. See "Certain Legal
Aspects of the Mortgage Loans--Cooperative Loans".
 
    With respect to Series of Certificates as to which the Company will not  act
as  Master Servicer, the Seller which sold the Mortgage Loans to the Company for
inclusion in the  Trust Fund  will make  representations and  warranties to  the
Company  with  respect to  such Mortgage  Loans  substantially similar  to those
indicated in the second  preceding paragraph, and the  Company will assign  such
representations  and warranties to the  Trustee and the Certificateholders under
the  Pooling  Agreement.  The  applicable  Prospectus  Supplement  and   Pooling
Agreement  may set forth additional representations and warranties of the Seller
and/or the Company.
 
    In the event of the discovery by the Company or the Servicer of a breach  of
any  representation  or  warranty  which materially  and  adversely  affects the
interest of the Certificateholders in the related Mortgage Loan, or the  receipt
of  notice of such a breach from the  Trustee, the Company or the Seller, as the
case may be,  will cure  the breach,  substitute a  new mortgage  loan for  such
Mortgage  Loan  or  repurchase such  Mortgage  Loan, or  any  Mortgaged Property
acquired with respect thereto, on the terms set forth above under  "--Assignment
of  Mortgage Loans". The proceeds of any  such repurchase will be passed through
to Certificateholders as liquidation  proceeds. This substitution or  repurchase
obligation  constitutes the sole  remedy available to  the Certificateholders or
the Trustee for any such breach.
 
    Under the  Pooling Agreement,  the  Master Servicer,  or the  Servicer  with
respect  to Series of Certificates for which  the Company will not act as Master
Servicer, will have the right, but not the obligation, to purchase any  Mortgage
Loan  from the  applicable Mortgage  Pool in the  event that  such Mortgage Loan
becomes 90 days or more delinquent.
 
SERVICING
 
    With respect to Series of Certificates as  to which the Company will act  as
Master  Servicer, pursuant to the Pooling  Agreement the Master Servicer will be
responsible for  servicing and  administering the  Mortgage Loans,  but will  be
permitted  to contract with the Seller/Servicer from whom each Mortgage Loan was
purchased, or another eligible servicing institution, to perform such  functions
under the supervision of the Master Servicer as more fully described below.
 
    In  the contract  pursuant to  which each  Seller/Servicer will  perform its
servicing duties, which  contract will  generally be the  Selling and  Servicing
Contract, each Seller/Servicer will agree, subject to the general supervision of
the  Master Servicer or its agent, to perform diligently all services and duties
customary to the servicing of mortgage  loans. The Master Servicer or its  agent
will  monitor each Seller/Servicer's performance and, unless otherwise specified
in the applicable Prospectus Supplement, the Master Servicer will have the right
to remove  and substitute  a replacement  Seller/  Servicer at  any time  if  it
considers  such removal  to be in  the best interest  of Certificateholders. The
duties performed by  the Seller/Servicers include  collection and remittance  of
principal  and interest  payments, administration  of mortgage  escrow accounts,
collection of insurance claims  and, if necessary, foreclosure.  In the event  a
Selling  and Servicing Contract is terminated by the Company for any reason, the
Master Servicer  may  procure a  substitute  Seller/Servicer, which  may  be  an
affiliate  of the  Master Servicer.  During the  period necessary  to effect the
execution and implementation of a contract with such substitute Seller/Servicer,
all duties  and responsibilities  of the  Seller/Servicer under  the  terminated
Selling and Servicing Contract will be performed by the Master Servicer. In such
event,  the Master Servicer will be entitled to retain the same Servicing Fee as
was paid to  the Seller/ Servicer  under such terminated  Selling and  Servicing
Contract.
 
                                       24
<PAGE>
    With  respect to Series of Certificates as to which the Company will not act
as Master  Servicer, pursuant  to the  Pooling Agreement  the servicing  of  the
Mortgage  Loans  will  be  performed  by  the  Servicer,  and  the  Company  (as
Certificate  Administrator)  will   calculate  amounts   distributable  to   the
Certificateholders,  prepare tax returns on behalf of the Trust Fund and provide
certain other administrative  services specified in  the Pooling Agreement.  The
Servicer   will  generally   perform  the   same  services   and  duties   as  a
Seller/Servicer under  a Selling  and Servicing  Agreement, as  well as  certain
services  of the Master Servicer described herein. The Trustee or its agent will
monitor the  Servicer's  performance  and, unless  otherwise  specified  in  the
applicable  Prospectus Supplement, the Trustee will have the right to remove and
substitute a replacement servicer, which may  be the Company or an affiliate  of
the  Company, to assume the servicing obligations of the Servicer at any time if
it considers such  removal to be  in the best  interests of  Certificateholders.
During  the period  necessary to  effect the  execution and  implementation of a
contract with such substitute servicer,  certain duties and responsibilities  of
the  Servicer under the Pooling  Agreement will be performed  by the Trustee. In
such event, the Trustee will be entitled to retain the same Servicing Fee as was
to be  paid the  Servicer under  the Pooling  Agreement. The  obligation of  the
Trustee  or  a  replacement servicer  to  perform  the servicing  duties  of the
Servicer will not, however, require such  party to cure any defect with  respect
to  any Mortgage  Loan, or substitute  a new  mortgage loan for  or repurchase a
Mortgage Loan  as to  which  there has  been a  breach  of a  representation  or
warranty  made by the Seller or to cure  any breach of a servicing covenant made
by the former Servicer.
 
    With respect to Series of Certificates as  to which the Company will act  as
Master Servicer, each Seller/Servicer will retain as its Servicing Fee a portion
of  the interest payable on each Mortgage Loan serviced by it. The Servicing Fee
will be  established  by the  Company  either  as a  fixed  rate or  as  a  rate
calculated  as the difference between interest at the Mortgage Interest Rate and
interest at the rate required to be  passed through to the Master Servicer  (the
"Net Rate"). Unless otherwise set forth in the applicable Prospectus Supplement,
the  Servicing Fee  will be  no less  than 0.25%  per annum  for each individual
Mortgage  Loan  serviced.  In  addition,  unless  otherwise  set  forth  in  the
Prospectus  Supplement, the Seller/Servicer will retain late charges, assumption
fees and similar charges  to the extent collected  from Mortgagors. The  Company
expects  that  such  fees  and  charges will  be  negligible  in  amount. Unless
otherwise provided in the applicable Prospectus Supplement, the Master  Servicer
will  retain as its Master Servicing Fee an amount which will be calculated as a
per annum  percentage  for each  Mortgage  Loan  plus an  amount  calculated  to
reimburse  the Master  Servicer for  the expenses  required to  be borne  by it,
which, unless otherwise set forth in the applicable Prospectus Supplement,  will
include  the Trustee's fees  and premiums on  or other expenses  relating to any
Mortgage Pool Insurance Policy and/or other credit enhancements.
 
    With respect to Series of Certificates as to which the Company will not  act
as Master Servicer, the Servicer will receive a Servicing Fee, as established in
the  applicable  Pooling Agreement,  which,  unless otherwise  indicated  in the
applicable Prospectus Supplement, will be no less than 0.25% per annum for  each
individual  Mortgage Loan serviced and the Certificate Administrator will retain
as its Certificate Administrator Fee an amount which will be calculated as a per
annum percentage for each Mortgage Loan  plus an amount calculated to  reimburse
the Certificate Administrator for payment by it of the Trustee's fees.
 
RETAINED YIELD
 
    For  certain Series,  the Company or  a Seller  may retain a  portion of the
interest payable  on each  Mortgage Loan  (the "Retained  Yield"). The  Retained
Yield  will either be set  as a fixed rate or  will be calculated by subtracting
the Master  Servicing Fee  and the  Remittance Rate  from the  Net Rate  or,  if
applicable,  by subtracting the Servicing Fee, the Certificate Administrator Fee
and the Remittance  Rate from  interest at  the Mortgage  Interest Rate.  Unless
otherwise  specified in the applicable  Prospectus Supplement, any such Retained
Yield and any earnings from reinvestments thereof will not be part of the  Trust
Fund.  The Company or the Seller, as the case may be, may at its option transfer
to a  third party  all  or a  portion of  the  Retained Yield  for a  Series  of
Certificates.
 
                                       25
<PAGE>
PAYMENTS ON MORTGAGE LOANS; CUSTODIAL ACCOUNTS FOR P&I,
    INVESTMENT ACCOUNT, CERTIFICATE ACCOUNT AND RESERVE
  ACCOUNT
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, pursuant  to the Servicing  Contract each Seller/Servicer  will
agree  to establish  and maintain  for the  Master Servicer  a special custodial
account for principal and interest (the "Custodial Account for P&I"), into which
it will deposit on a daily  basis (unless otherwise specified in the  applicable
Prospectus   Supplement)  the   following  payments   and  collections  received
subsequent to the Cut-Off Date (other than payments due on or before the Cut-Off
Date) with respect to the Mortgage Loans serviced by it:
 
        (i) All  payments  on  account  of  principal  and  interest,  including
    Principal Prepayments;
 
        (ii)  All net  proceeds received in  connection with  the liquidation of
    defaulted Mortgage Loans, by foreclosure or otherwise (hereinafter  referred
    to  as "Liquidation Proceeds"), or  under any applicable credit enhancements
    or title, hazard or other insurance policy covering any Mortgage Loan, other
    than proceeds to  be applied  to the restoration  or repair  of the  related
    Mortgaged Property (hereinafter referred to as "Insurance Proceeds");
 
       (iii)  Any Advances of such Seller/Servicer's  funds (such Advances to be
    deposited prior to the Withdrawal Date, as defined below); and
 
       (iv) All proceeds of any Mortgage  Loans or property acquired in  respect
    thereof  repurchased  as required  for defects  in documentation,  breach of
    representations or warranties, or otherwise.
 
    Each Seller/Servicer has the option of either (i) depositing gross  interest
collections  in  the Custodial  Account for  P&I, subject  to withdrawal  of its
related Servicing Fees, or (ii) deducting its Servicing Fees from gross interest
collections prior to deposit in such account.
 
    On the Withdrawal Date or, with  the Master Servicer's approval, on a  daily
basis,  each  Seller/  Servicer  may withdraw  the  following  amounts  from its
Custodial Account for P&I:
 
        (i) Amounts received on  particular Mortgage Loans  as late payments  of
    principal  or interest and respecting which  the Seller/Servicer has made an
    unreimbursed Advance;
 
        (ii) Amounts to  reimburse the Seller/Servicer  for Advances the  Master
    Servicer has determined to be otherwise nonrecoverable; and
 
       (iii) Amounts in respect of Servicing Fees previously deposited.
 
    The  Company will require that deposits in each Custodial Account for P&I be
(i) insured by the FDIC, (ii) held in a trust account in the trust department of
an institution holding such account in such manner 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 Seller/Servicer and of any
creditors or depositors of the institution  in which such account is  maintained
or  (iii) held in such other account acceptable to the rating agency or agencies
for the Series of Certificates. If a Custodial Account for P&I is insured by the
FDIC and at any time the amount in such account exceeds the limits of  insurance
on  such account, the Seller/Servicer shall  be required to withdraw such excess
from such  account and  remit  it to  the Master  Servicer  for deposit  in  the
Investment Account described below.
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer  and  unless  otherwise  specified  in  the  related  Prospectus
Supplement, not later than the 20th day of each month (or the preceding business
day  if such 20th day is not a business day) (the "Withdrawal Date"), the Master
Servicer will withdraw or direct the withdrawal from any funds in the  Custodial
Account for P&I maintained by each Seller/Servicer an amount representing:
 
        (i)  Scheduled installments  of principal  and interest  on the Mortgage
    Loans received or  advanced by  the Seller/Servicer  which were  due on  the
    first   day  of   the  current  month,   net  of  Servicing   Fees  due  the
    Seller/Servicer and less  any amounts to  be withdrawn later  by the  Master
    Servicer from any applicable Buydown Fund Account;
 
                                       26
<PAGE>
        (ii)  Proceeds  of  liquidations  of  Mortgage  Loans  received  by  the
    Seller/Servicer in the immediately  preceding calendar month, with  interest
    to  the date of  liquidation, net of Servicing  Fees due the Seller/Servicer
    and less any amounts to be withdrawn  later by the Master Servicer from  any
    applicable Buydown Fund Account;
 
       (iii)  Principal due to Payoffs received  during the period from the 15th
    of the  immediately  preceding  calendar  month through  the  14th  of  such
    calendar  month; in each  case with interest  at the applicable Pass-Through
    Rate attributable to interest paid by the Mortgagor through the date of  the
    Payoff  (provided, however, that in the case of Payoffs received between the
    first day and the 14th day of any month, interest accrued from the first day
    of such  month  to  the  date  of  such Payoff  will  not  be  paid  to  the
    Certificateholders),  less any amounts  to be withdrawn  later by the Master
    Servicer from any applicable Buydown Fund Account; and
 
       (iv) Curtailments received by the Seller/Servicer on such Mortgage  Loans
    in the immediately preceding calendar month.
 
    All amounts withdrawn from the Custodial Accounts for P&I, together with any
Insurance  Proceeds  or  Liquidation  Proceeds (including  any  amounts  paid in
respect of repurchase obligations on defective Mortgage Loans or otherwise)  not
otherwise  applied by  Seller/Servicers and  amounts withdrawn  from any Buydown
Fund Account, if applicable, shall be immediately deposited into the  Investment
Account.
 
    Under  the Pooling Agreement for each Series of Certificates as to which the
Company will  act  as  Master  Servicer, the  Master  Servicer  or  the  related
Seller/Servicer  is permitted to make the following withdrawals from the Buydown
Fund Account or Custodial Account for P&I, as applicable:
 
        (i) To deposit in the Investment  Account the amount necessary in  order
    to supplement payments received on Buydown Loans;
 
        (ii)  In  the  event of  a  Payoff of  any  Buydown Loan,  to  apply the
    remaining related Buydown Funds to reduce the required amount of such Payoff
    (or, if the Mortgagor has made a Payoff equal in amount to the total  unpaid
    principal  balance, to  refund such  remaining Buydown  Funds to  the person
    entitled to receive such Buydown Funds);
 
       (iii) In the event of foreclosure or liquidation of any Buydown Loan,  to
    deposit the remaining related Buydown Funds in the Investment Account; and
 
       (iv)  To  clear and  terminate the  portion  of any  account representing
    Buydown Funds.
 
    Unless otherwise  specified in  the  applicable Prospectus  Supplement,  the
Master  Servicer may invest funds withdrawn  from the Custodial Accounts for P&I
each month  and  remitted to  the  Master Servicer,  as  well as  any  Insurance
Proceeds, Liquidation Proceeds and Buydown Funds, for its own account and at its
own risk, for the period from the Withdrawal Date to the next Distribution Date,
or  for such  longer or  shorter period  as may  be specified  in the applicable
Prospectus Supplement (in  each case,  the "Investment  Period"). Investment  of
such  funds shall be made through an account  in the name of the Master Servicer
and the Trustee  (the "Investment Account"),  which shall be  maintained in  the
trust  department  of  a bank  acceptable  to  any applicable  rating  agency or
agencies for  the  Series of  Certificates.  The  Investment Account  may  be  a
commingled account with other similar accounts maintained by the Master Servicer
and  invested for  its own  account; provided,  that the  maintenance of  such a
commingled account has been approved by any applicable rating agency or agencies
for the Series  of Certificates.  Unless otherwise specified  in the  applicable
Prospectus  Supplement, the investment of funds  in the Investment Account shall
be limited to the investments described below.
 
    On the last day of the Investment Period, the Master Servicer will  withdraw
from   the   Investment   Account   all  funds   due   to   be   distributed  to
Certificateholders, and shall  deposit such  funds, together  with any  Advances
required to be made by it, in the Certificate Account described below.
 
    Unless  otherwise  specified in  the  applicable Prospectus  Supplement, the
investment of funds in an Investment Account shall be limited to one or more  of
the  following  investments ("Eligible  Investments")  which shall  in  no event
mature later than the next Distribution Date:
 
                                       27
<PAGE>
        (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 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; provided that the unsecured obligations of
    the party agreeing to repurchase such  obligations are at the time  assigned
    such  ratings as may be required by the applicable rating agency or agencies
    for the Series of Certificates at the date of acquisition thereof;
 
       (iii) Federal funds, certificates of deposit, time deposits and  bankers'
    acceptances  of any bank or trust company incorporated under the laws of the
    United States or any  state thereof; 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)  have
    been  assigned  such ratings  as may  be required  by the  applicable rating
    agency or rating  agencies for  the Series of  Certificates at  the date  of
    acquisition thereof;
 
       (iv)  Obligations of, or guaranteed by, any state of the United States or
    the District  of  Columbia  receiving the  highest  long-term  debt  ratings
    available  for such  securities by  the applicable  rating agency  or rating
    agencies for the Series of Certificates;
 
        (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
    been assigned  such ratings  as may  be required  by the  applicable  rating
    agency or rating agencies for the Series of Certificates; or
 
       (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
    rated by each applicable rating agency or rating agencies for the Series  of
    Certificates  in its highest long-term  unsecured rating category; 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  Custodial Account  for P&I,  the Investment
    Account or the Certificate Account to exceed 20% of the aggregate  principal
    amount  of all Eligible  Investments then held in  the Custodial Account for
    P&I, the Investment Account and the Certificate Account;
 
       (vii) Units of taxable  money market funds or  mutual funds, which  funds
    have  been rated by each applicable rating agency or rating agencies for the
    Series of Certificates  in its highest  rating category or  which have  been
    designated  in  writing by  each such  rating agency  or rating  agencies as
    Eligible Investments with respect to this definition; or
 
      (viii) such other investments bearing interest  or sold at a discount  the
    investment  in which will not, as evidenced by a letter from each applicable
    rating agency or rating agencies for  the Series of Certificates, result  in
    the  downgrading  or withdrawal  of the  rating or  ratings assigned  to the
    Certificates by such rating agency or rating agencies.
 
    Not later than  the Distribution  Date for a  Series of  Certificates as  to
which the Company will act as Master Servicer, the Master Servicer will withdraw
from  the  Investment Account  all amounts  required to  be distributed  on such
Distribution Date and deposit such amounts into a separate  non-interest-bearing
trust  account (the "Certificate Account") in  the corporate trust department of
the Trustee  or  another depository  institution  acceptable to  the  applicable
rating agency or rating agencies.
 
    Under  the Pooling Agreement for each Series of Certificates as to which the
Company will act as Master Servicer,  the Master Servicer will be authorized  to
make the following withdrawals from the Certificate Account:
 
        (i) To reimburse the Master Servicer or any Seller/Servicer for Advances
    out of amounts received as late payments on related Mortgage Loans or out of
    related Insurance Proceeds or Liquidation Proceeds;
 
                                       28
<PAGE>
        (ii)  To reimburse  the Master  Servicer or  any Seller/Servicer  out of
    related Insurance Proceeds or Liquidation  Proceeds for amounts expended  by
    the  Master  Servicer  or  any  Seller/  Servicer  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 that portion of any payment which constitutes Retained Yield
    or the Master Servicing Fee (a) deposited by a Seller/Servicer in respect of
    interest on a Mortgage Loan, (b) deposited by the Master Servicer in respect
    of  interest on a  Mortgage Loan or  (c) deposited as  Insurance Proceeds or
    Liquidation Proceeds  (including  amounts  paid  in  respect  of  repurchase
    obligations on defective Mortgage Loans or otherwise) in respect of interest
    on a Mortgage Loan and as to which no prior withdrawals from funds deposited
    by  the Master Servicer have been made; provided, however, that with respect
    to any payment of interest deposited  in the Certificate Account in  respect
    of a Mortgage Loan (whether paid by the Mortgagor or received as Liquidation
    Proceeds,  Insurance  Proceeds or  otherwise) which  is  less than  the full
    amount of  interest due  with  respect to  such  Mortgage Loan,  the  Master
    Servicer  shall withdraw from the Certificate Account as Retained Yield only
    that portion of such payment of interest that bears the same relationship to
    the total  amount of  such payment  of  interest as  the Retained  Yield  in
    respect  of such Mortgage Loan bears to  the Mortgage Interest Rate for such
    Mortgage Loan;
 
       (iv) To reimburse the Master Servicer or any Seller/Servicer for Advances
    which the Master Servicer has determined to be otherwise nonrecoverable;
 
        (v) To  pay  any  expenses  which were  incurred  and  are  reimbursable
    pursuant to the Pooling Agreement; and,
 
    after making or providing for the above withdrawals,
 
       (vi)  To  make  payments  to  Certificateholders  and/or  the  Company as
    described below under  "--Distributions on  Certificates" and  to clear  and
    terminate  the Certificate Account upon liquidation of all Mortgage Loans or
    other termination of the Trust Fund.
 
    The Master Servicer  may also  establish with the  Trustee for  a Series  of
Certificates  a Reserve  Account if required  to assure  timely distributions of
principal and interest, as a condition to obtaining a specified rating for  such
Certificates  or to provide for the expenses of the Trust Fund. Any such Reserve
Account  so  established  will  be   described  in  the  applicable   Prospectus
Supplement.
 
    With  respect to Series of Certificates as to which the Company will not act
as Master  Servicer, unless  otherwise specified  in the  applicable  Prospectus
Supplement,  the Custodial  Account for  P&I, the  Buydown Fund  Account and the
Reserve Account  will be  established  by the  Servicer,  and the  required  and
permitted  deposits into and withdrawals from such accounts set forth above will
be made by the Servicer. The Servicer shall deposit any required Advances in the
Custodial Account for P&I  on the Withdrawal Date.  The withdrawal of funds  and
their  deposit into the Investment Account  on the Withdrawal Date, as described
above, will also be effected by  the Servicer. The Investment Account  described
above  will be established by the Certificate Administrator and the Trustee, and
investments of amounts therein in Eligible  Investments will be directed by  the
Certificate  Administrator  for  its  own  account  and  at  its  own  risk. The
Certificate Administrator will make the required withdrawal from the  Investment
Account  on the last day of the Investment Period for deposit in the Certificate
Account, as described above. Authorized withdrawals from the Certificate Account
for the purposes described above will be made by the Certificate  Administrator.
Other  than  as  set  forth  in this  paragraph,  unless  the  context otherwise
requires, references above to  "Master Servicer" or  "Seller/ Servicer", and  to
"Master  Servicing Fee" shall  refer instead to  "Servicer" and "Servicing Fee",
respectively.
 
DISTRIBUTIONS ON CERTIFICATES
 
    On each Distribution  Date commencing in  the month following  the month  in
which  the Cut-Off Date  occurs (or such other  time as may be  set forth in the
applicable Prospectus  Supplement),  the Trustee,  the  Master Servicer  or  the
Certificate Administrator, as applicable, acting on behalf of the Trustee or the
Paying  Agent  will  withdraw from  the  Certificate Account  and  distribute to
 
                                       29
<PAGE>
Certificateholders of record on  the applicable Record Date,  and to holders  of
residual  interests,  if any,  who are  entitled  to receive  such distributions
pursuant to the  terms of  the applicable Pooling  Agreement, to  the extent  of
their entitlement thereto, an amount in the aggregate equal to the sum of:
 
        (i) All scheduled payments of principal and interest at the Pass-Through
    Rate either collected from the Mortgagors on the Mortgage Loans prior to the
    related  Determination Date  (as defined  below) or  advanced by  the Master
    Servicer, the Servicer or the Seller/Servicers;
 
        (ii) Scheduled amounts  of Buydown Funds  respecting Buydown Loans  (not
    withdrawn  and remitted by  the Servicer or  the related Seller/Servicer, as
    applicable);
 
       (iii) All Curtailments received on the Mortgage Loans in the month  prior
    to  the  month  in which  the  Distribution Date  occurs  (the "Distribution
    Period");
 
       (iv) All Insurance Proceeds or  Liquidation Proceeds received during  the
    Distribution  Period, together with interest  at the applicable Pass-Through
    Rate to the extent  described herein under "Yield  Considerations--Effective
    Interest Rate"; and
 
        (v)  All Payoffs  received during  the period from  the 15th  day of the
    immediately preceding calendar month through  the 14th day of such  calendar
    month;  in each case  together with interest  at the applicable Pass-Through
    Rate  to  the  extent  described  under  "Yield  Considerations--  Effective
    Interest Rate" herein;
 
    less the sum of:
 
        (a)  Previously unreimbursed Advances  made by the  Master Servicer, the
    Seller/Servicers or the Servicer on  Mortgage Loans which are considered  by
    the  Master  Servicer  or  the Servicer,  as  the  case may  be,  as  of the
    Distribution Date to be nonrecoverable;
 
        (b) Amounts expended by the Seller/Servicers, the Master Servicer or the
    Servicer in  connection with  the preservation  or restoration  of  property
    securing  Mortgage Loans which have  been liquidated and related liquidation
    expenses; and
 
        (c) Amounts  representing other  expenses of  the Master  Servicer,  the
    Seller/Servicers  or  the  Servicer, reimbursable  pursuant  to  the Pooling
    Agreement.
 
    In addition, if the Master Servicer  with respect to Series of  Certificates
as  to  which the  Company will  act as  Master Servicer,  or the  Servicer with
respect to Series of Certificates as to which the Company will not act as Master
Servicer, is obligated  to do  so under  the applicable  Pooling Agreement,  the
Master Servicer or the Servicer, as the case may be, shall include with any such
distribution  an  Advance  equal  to principal  payments  and  interest payments
(adjusted to the applicable Pass-Through Rate or Rates) due on the first day  of
the month in which the Distribution Date occurs and not received as of the close
of  business  on  the Withdrawal  Date,  subject  to such  Master  Servicer's or
Servicer's determination that such payments are recoverable from future payments
or collections on  the Mortgage  Loans, any subordination  feature or  Insurance
Proceeds or Liquidation Proceeds. See "--Advances" below.
 
    The  method of allocating the amount  withdrawn from the Certificate Account
on each Distribution Date  to principal and interest  (or, where applicable,  to
principal  only or interest only) on a particular Series of Certificates will be
described in the applicable Prospectus Supplement. Distributions of interest  on
each  Class of  Certificates will  be made  prior to  distributions of principal
thereon. Each Class of  Certificates may have a  different Remittance Rate,  and
each  Remittance  Rate  may be  fixed,  variable or  adjustable.  The applicable
Prospectus Supplement will specify the Remittance Rate for each Class, or in the
case of a variable  or adjustable Remittance Rate,  the initial Remittance  Rate
and the method for determining the Remittance Rate.
 
    On  each Distribution  Date for a  Series of Certificates,  the Trustee, the
Master Servicer or the  Certificate Administrator, as  applicable, on behalf  of
the  Trustee or the  Paying Agent, as the  case may be,  will distribute to each
holder of record on the Record Date, an amount equal to the Percentage  Interest
(as defined below) represented by the Certificate held by such holder multiplied
by  the sum of  the Class Principal  Distribution Amount (as  defined below) for
such Class  and, if  such Class  is entitled  to payments  of interest  on  such
Distribution   Date,  one   month's  interest   at  the   applicable  Remittance
 
                                       30
<PAGE>
Rate on  the principal  balance  or notional  principal  balance of  such  Class
specified  in  the  applicable  Prospectus  Supplement,  less  (unless otherwise
specified in the related Prospectus Supplement)  such Class's pro rata share  of
the sum of (i) the shortfalls in collections of interest on Payoffs with respect
to  which distribution is to be made on such Distribution Date, if any, (ii) the
amount of any deferred interest added  to the principal balance of the  Mortgage
Loans  and/or the  outstanding balance  of the  Certificates on  the related Due
Date, (iii) one  month's interest  at the  applicable Pass-Through  Rate on  the
amount of any Curtailments received on the Mortgage Loans in the month preceding
the month of the distribution and (iv) any other interest shortfalls (including,
without  limitation, shortfalls arising out of  application of the Soldiers' and
Sailors' Relief Act or similar legislation or regulations as in effect from time
to time) allocable to  Certificateholders which are not  covered by advances  or
applicable  credit enhancements, in each case in  such amount as is allocated to
such Class on  the basis  set forth in  the related  Prospectus Supplement.  The
"Percentage Interest" represented by a Certificate of a particular Class will be
equal  to the percentage  obtained by dividing the  initial principal balance or
notional amount of such Certificate by the aggregate initial amount or  notional
amount  of all the Certificates of such Class. The "Class Principal Distribution
Amount" for  a Class  of Certificates  for  any Distribution  Date will  be  the
portion, if any, of the Principal Distribution Amount (as defined in the related
Prospectus  Supplement) allocable to  such Class for  such Distribution Date, as
described in the related Prospectus Supplement.
 
    In the case of a Series of  Certificates which includes two or more  Classes
of  Certificates, the timing, sequential order, priority of payment or amount of
distributions in respect  of principal,  and any  schedule or  formula or  other
provisions  applicable to  the determination thereof  with respect  to each such
Class shall be as provided  in the related Prospectus Supplement.  Distributions
in  respect of principal of any Class of Certificates will be made on a pro rata
basis among all of the Certificates of such Class.
 
    With respect to Series of Certificates as  to which the Company will act  as
Master  Servicer  and except  as otherwise  provided  in the  applicable Pooling
Agreement, not later than  the tenth day preceding  each Distribution Date  (the
"Determination  Date"), the Master Servicer will  furnish to the Trustee (and to
any Certificateholder  upon request)  a statement  setting forth  the  aggregate
amount   to  be  distributed  on  such   Distribution  Date  to  each  Class  of
Certificates, on account of principal  and/or interest, stated separately.  With
respect to Series of Certificates as to which the Company will not act as Master
Servicer, the Certificate Administrator will provide the statements described in
the preceding sentence.
 
REPORTS TO CERTIFICATEHOLDERS
 
    For    each   Series   of   Certificates,    with   each   distribution   to
Certificateholders from  the Certificate  Account, the  Trustee, or  the  Master
Servicer  or Certificate Administrator, as applicable, on behalf of the Trustee,
will forward to each Certificateholder a statement or statements with respect to
the related Trust Funds setting forth the information specifically described  in
the  related Pooling Agreement, which generally  will include the following with
respect to such Series of Certificates:
 
        (i) the  beginning  principal  balance  or  notional  principal  balance
    representing the ending balance from the prior statement;
 
        (ii) the amount, if any, of such distribution principal;
 
       (iii)  the amount, if any, of  such distribution allocable to interest on
    the Mortgage  Loans  accrued at  the  applicable Pass-Through  Rate  on  the
    beginning principal balance or notional principal balance, and, with respect
    to  a Series of  Certificates where one  or more Classes  of such Series are
    subordinated in  right of  payment to  one  or more  other Classes  of  such
    Series,  the amount, if any, of any  shortfall in the amount of interest and
    principal distributed;
 
       (iv) the total amount distributed;
 
        (v) the ending principal balance or notional principal balance after the
    application in (ii) above; and
 
       (vi)  the  then   applicable  Pass-Through  Rate   or  weighted   average
    Pass-Through  Rate, calculated  as of the  close of business  on the related
    Determination Date.
 
                                       31
<PAGE>
    Upon request, a Certificateholder  may receive a  monthly report which  sets
forth  (i) the amount of the distribution  for such month allocable to Principal
Prepayments, miscellaneous  post-liquidation  collections and  Conversion  Fees,
(ii)  Mortgage Loan delinquencies, indicating the number and aggregate principal
amount of Mortgage Loans delinquent  one, two and three  months, as well as  the
book  value of any Mortgaged Property acquired through foreclosure, deed in lieu
of foreclosure or  other exercise  of rights respecting  the Trustee's  security
interest in the Mortgage Loans, (iii) the amount of remaining coverage under any
applicable  credit enhancements, stated separately, as  of the close of business
on the applicable Determination  Date and (iv) the  sum of the Master  Servicing
Fee and the aggregate Servicing Fees for the month.
 
    In  addition, by the date  required by applicable tax  law of each year, the
Master Servicer with respect to Series  of Certificates as to which the  Company
will  act as Master  Servicer, or the Certificate  Administrator with respect to
Series of Certificates as to which the Company will not act as Master  Servicer,
will furnish a report to each Certificateholder of record at any time during the
preceding calendar year as to the aggregate of amounts reported pursuant to (ii)
in  the second preceding  paragraph above, plus information  with respect to the
amount of servicing compensation for the related Mortgage Pool, the value of any
property acquired by  the Trustee through  abandonment or foreclosure,  deferred
interest  added to  the principal balance  or the notional  principal balance of
each Class of Certificates, as applicable, and such other customary  information
as  the Master Servicer or  Certificate Administrator, as applicable, determines
to be necessary to  enable Certificateholders to prepare  their tax returns  for
such  calendar year  or, in  the event  such person  was a  Certificateholder of
record during a  portion of such  calendar year, for  the applicable portion  of
such a year.
 
ADVANCES
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer  and  unless  otherwise  stated  in  the  applicable  Prospectus
Supplement, the Master Servicer will be obligated under the Pooling Agreement to
make  Advances (to the extent not previously advanced by the Seller/Servicers as
described below) in amounts sufficient to cover any deficiency between the funds
scheduled to be received on the  Mortgage Loans during the Distribution  Period,
and  amounts withdrawn  from the Custodial  Accounts for P&I  on each Withdrawal
Date during the Distribution Period and from any Buydown Fund Account; provided,
however, that the Master Servicer will  be obligated to make such Advances  only
to  the extent any such Advance, in the  judgment of the Master Servicer made on
the  Determination  Date,  will  be  reimbursable  from  any  applicable  credit
enhancements,  from Mortgagor payments or from Liquidation Proceeds or Insurance
Proceeds of  the  related Mortgage  Loans.  In connection  with  certain  credit
enhancements,  the  Master Servicer  may  make other  advances,  such as  to pay
insurance premiums,  real estate  property  taxes, protection  and  preservation
taxes, sales expenses and foreclosure costs including court costs and reasonable
attorneys' fees in connection with a Mortgage Pool Insurance Policy, which shall
also constitute "Advances".
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer  and  unless  otherwise  stated  in  the  applicable  Prospectus
Supplement,  each Seller/Servicer will be obligated to advance on the Withdrawal
Date its own funds or funds from the Custodial Account for P&I maintained by  it
equal  to the  amount of  any deficiency  between the  amount in  such Custodial
Account for P&I on the Withdrawal Date and the amount due to be remitted to  the
Master Servicer on such date. Each Seller/Servicer will advance only funds which
the Master Servicer anticipates will be ultimately reimbursable from the sources
discussed  above. To  the extent  the Seller/Servicers  make such  Advances, the
Master Servicer will  be relieved of  its obligation, if  any, to make  Advances
with  respect to the Mortgage Loans respecting which such amounts were advanced.
If an Advance made by any Seller/Servicer later proves to be unrecoverable,  the
Master  Servicer will cause such Seller/ Servicer to be reimbursed from funds in
the Certificate Account.
 
    With respect to Series of Certificates as to which the Company will not  act
as  Master Servicer  and unless  otherwise stated  in the  applicable Prospectus
Supplement, the  Servicer  will be  obligated  under the  Pooling  Agreement  to
advance on the Withdrawal Date its own funds or funds from the Custodial Account
for  P&I  equal to  the  amount of  any deficiency  between  the amount  in such
Custodial Account  for P&I  on the  Withdrawal Date  and the  amount due  to  be
remitted  to the  Certificate Administrator on  such date. The  Servicer will be
obligated   to   make   such   Advances   only   to   the   extent   any    such
 
                                       32
<PAGE>
Advance, in the judgment of the Servicer made on the related Determination Date,
will  be reimbursable  from any  applicable credit  enhancements, from Mortgagor
payments or  from Liquidation  Proceeds  or Insurance  Proceeds of  the  related
Mortgage  Loans.  In connection  with  certain credit  enhancements,  the Master
Servicer may make other advances, such as to pay insurance premiums, real estate
property  taxes,  protection   and  preservation  taxes,   sales  expenses   and
foreclosure  costs  including  court  costs and  reasonable  attorneys'  fees in
connection with a Mortgage  Pool Insurance Policy,  which shall also  constitute
"Advances".
 
COLLECTION AND OTHER SERVICING PROCEDURES
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, under the Selling  and Servicing Contract each  Seller/Servicer
agrees  to make reasonable efforts to collect  all payments called for under the
Mortgage Notes and will, consistent with the Selling and Servicing Contract, the
Pooling Agreement for any Series and any applicable credit enhancements,  follow
such  collection  procedures  as it  follows  or  would follow  with  respect to
mortgage loans held  for its own  account which are  comparable to the  Mortgage
Loans.  With respect to Series of Certificates  as to which the Company will not
act as Master Servicer and the servicing of the Mortgage Loans will be performed
by the Servicer,  the Pooling Agreement  will require the  Servicer to make  the
same  efforts to  collect payments  on the  Mortgage Notes  and follow  the same
collection procedures  as  would  be required  of  the  Servicer if  it  were  a
Seller/Servicer  under  a Selling  and Servicing  Contract. Consistent  with the
above, each Seller/Servicer with respect to  Series of Certificates as to  which
the  Company will act as Master Servicer, or the Servicer with respect to Series
of Certificates as to which the Company will not act as Master Servicer, may, in
its discretion, (i) waive  any prepayment charge,  assumption fee, late  payment
charge  or  any other  charge in  connection  with a  Principal Prepayment  on a
Mortgage Loan and (ii) only upon receiving authorization from the insurer on any
applicable Mortgage Pool Insurance Policy or Primary Insurance Policy, and  with
respect  to  each  Seller/Servicer, from  the  Master Servicer,  arrange  with a
Mortgagor a schedule for  the liquidation of delinquencies  running for no  more
than  180 days after the  first delinquent due date  for payment on any Mortgage
Note. Such authorization shall be given  by the Master Servicer or the  Servicer
only  upon determining that the coverage of such Mortgage Loan by any applicable
credit enhancement will not be affected.  In the event of any such  arrangement,
the  Master Servicer's obligation to make Advances on the related Mortgage Loan,
if any, shall continue during the  scheduled period to the extent such  Advances
are not made by the Seller/Servicers.
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, the  Selling and Servicing  Contract with each  Seller/Servicer
requires   that  such  Seller/Servicer   enforce  "due-on-sale"  clauses,  where
applicable, with respect to the Mortgage Loans  on the same basis as with  loans
in  its own portfolio, provided that such clause  is not to be enforced if it is
unenforceable under applicable law or the terms of the related Mortgage Note  or
if the coverage of any related credit enhancement would be adversely affected by
such  enforcement. Subject to the above, if  a Mortgaged Property has been or is
about to  be  conveyed by  the  Mortgagor,  the Seller/Servicer  or  the  Master
Servicer  will  be authorized  to take  or enter  into an  assumption agreement,
pursuant to which the Mortgagor remains liable under the Mortgage Note, from  or
with  the person  to whom  such Mortgaged Property  has been  or is  about to be
conveyed.  Any  fees  collected  by  a  Seller/Servicer  for  entering  into  an
assumption   agreement  will   be  retained   by  it   as  additional  servicing
compensation. With respect  to Series of  Certificates as to  which the  Company
will  not act as Master Servicer and the servicing of the Mortgage Loans will be
performed by the Servicer,  the Pooling Agreement will  require the Servicer  to
enforce any "due-on-sale" clause in the instances and to the extent described in
the  first sentence of  this paragraph, and  the Servicer will  be authorized to
take or enter  into an assumption  agreement and retain  any fees collected  for
entering  into an assumption  agreement as additional  servicing compensation to
the same extent as a Seller/Servicer will  be so authorized under a Selling  and
Servicing Contract.
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, the Master Servicer  may, or upon receiving authorization  from
the  Master  Servicer,  a  Seller/Servicer  may,  in  connection  with  any such
conveyance and only upon assurance that the related Mortgage Loan will  continue
to  be  covered  by  any applicable  credit  enhancement,  release  the original
Mortgagor from liability upon the Mortgage Note and substitute the new Mortgagor
as liable thereon. If required by
 
                                       33
<PAGE>
law or the terms  of the related  Mortgage Note, the  Master Servicer may  allow
such  release  and  substitution without  the  consent  of the  provider  of any
applicable credit  enhancement.  In  connection  with  any  such  assumption  or
substitution,  the Mortgage Interest Rate borne by the related Mortgage Note may
not be changed. With respect to Series  of Certificates as to which the  Company
will  not act as Master Servicer and the servicing of the Mortgage Loans will be
performed by  the  Servicer,  the  Servicer may  in  connection  with  any  such
conveyance  release the original Mortgager from liability upon the Mortgage Note
and substitute a new  Mortgagor as liable  thereon in the  instances and to  the
extent described above in this paragraph with respect to the Master Servicer.
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, under each Selling  and Servicing Contract the  Seller/Servicer
is  required to  establish and  maintain a  Custodial Account  for Reserves into
which Mortgagors deposit  amounts sufficient to  pay taxes, assessments,  hazard
insurance  premiums or comparable items to the extent it is consistent with such
Seller/Servicer's normal practices to collect payments from Mortgagors to  cover
tax  and insurance expenses. Withdrawals from the Custodial Account for Reserves
maintained for  Mortgagors  may be  made  to  effect timely  payment  of  taxes,
assessments  and hazard insurance premiums or comparable items, to reimburse the
Seller/Servicer out of related assessments for maintaining hazard insurance,  to
refund  to  Mortgagors amounts  determined to  be overages,  to pay  interest to
Mortgagors on balances in  the Custodial Account for  Reserves, if required,  to
repair  or otherwise protect  the Mortgaged Property and  to clear and terminate
the Custodial Account for Reserves. Each Seller/ Servicer is solely  responsible
for administration of the Custodial Account for Reserves and is expected to make
Advances  to  such account  when a  deficiency exists  therein. With  respect to
Series of Certificates as to which the  Company will not act as Master  Servicer
and  the servicing of the Mortgage Loans  will be performed by the Servicer, the
Servicer will be  required to  establish and  maintain a  Custodial Account  for
Reserves  and to make Advances  to such account, and  will be authorized to make
withdrawals from the Custodial Account for Reserves, in the instances and to the
extent a Seller/ Servicer  would be so required  and authorized under a  Selling
and Servicing Contract.
 
SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, the Seller/Servicers' primary compensation for their  servicing
activities  will come from the  payment to them or the  retention by them, of an
amount equal to the Servicing Fee for each Mortgage Loan. The Master  Servicer's
primary  compensation  for  supervising  the  mortgage  servicing  and advancing
certain expenses of  a Mortgage Pool  will come from  the payment to  it, of  an
amount  equal to the Master Servicing Fee  with respect to each Mortgage Loan in
such Mortgage Pool. The Master Servicing Fee and the Servicing Fee with  respect
to  each payment of interest received on  a Mortgage Loan will equal one-twelfth
of the  annual Master  Servicing  Fee or  Servicing  Fee annual  percentage,  as
applicable,  set forth  in the Pooling  Agreement multiplied  by the outstanding
principal balance of such Mortgage Loan  during the month for which such  amount
is  computed. In  addition to  the Servicing Fee  and Master  Servicing Fee, the
Company or a Seller may retain as its  Retained Yield the right to a portion  of
the  interest  payable  on  each Mortgage  Loan  calculated  by  subtracting the
applicable Pass-Through Rate and related Servicing Fee and Master Servicing  Fee
from the applicable Mortgage Interest Rate.
 
    With  respect to Series of Certificates as to which the Company will not act
as Master Servicer and the servicing of the Mortgage Loans will be performed  by
the  Servicer, the Servicer's primary  compensation for its servicing activities
will come from the payment to it or its retention, with respect to each interest
payment on a Mortgage  Loan, of an  amount equal to the  Servicing Fee for  such
Mortgage  Loan.  The Servicing  Fee  with respect  to  each payment  of interest
received on a Mortgage Loan will  equal one-twelfth of the Servicing Fee  annual
percentage  set forth  in the  Pooling Agreement  multiplied by  the outstanding
principal balance of such Mortgage Loan  during the month for which such  amount
is  computed. In  addition to  the Servicing  Fee, the  Company or  a Seller may
retain as its Retained Yield the right  to a portion of the interest payable  on
each  Mortgage Loan  calculated by  subtracting the  related Servicing  Fee, the
Certificate Administrator  Fee  and  the Remittance  Rate  from  the  applicable
Mortgage Interest Rate.
 
    With  respect to Series of Certificates as to which the Company will not act
as Master Servicer and the servicing of the Mortgage Loans will be performed  by
the Servicer, the Certificate Administrator's
 
                                       34
<PAGE>
compensation  for its administrative services will  come from the payment to it,
with respect to each interest payment on a Mortgage Loan, of an amount equal  to
the  Certificate  Administrator  Fee  for such  Mortgage  Loan.  The Certificate
Administrator Fee  with  respect to  each  payment  of interest  received  on  a
Mortgage Loan will equal one-twelfth of the annual Certificate Administrator Fee
annual  percentage  set  forth  in  the  Pooling  Agreement  multiplied  by  the
outstanding principal balance of such Mortgage  Loan during the month for  which
such  amount is computed, subject to any minimum fee as will be set forth in the
applicable Prospectus Supplement.
 
    As principal  payments  are made  on  each Mortgage  Loan,  the  outstanding
principal  balance of the Mortgage Loans  will decline, and thus compensation to
the Seller/Servicers  and  the Master  Servicer,  or  to the  Servicer  and  the
Certificate  Administrator with respect to Series  of Certificates for which the
Company will not act as Master Servicer, and any Retained Yield will decrease as
the Mortgage Loans amortize (subject to any minimum levels of such  compensation
set  forth in the  applicable Prospectus Supplement).  Principal Prepayments and
liquidations of  Mortgage Loans  prior  to maturity  will also  cause  servicing
compensation to the Seller/Servicers and the Master Servicer, or to the Servicer
and  the Certificate  Administrator, as  applicable, and  any Retained  Yield to
decrease (subject to any  minimum levels of such  compensation set forth in  the
applicable Prospectus Supplement).
 
    In  addition  to their  primary  compensation, the  Seller/Servicers  or the
Servicer, as applicable, will  retain all prepayment  fees, assumption fees  and
late   payment   charges,  to   the  extent   collected  from   Mortgagors.  The
Seller/Servicers' or the Servicer's  income from such  charges will depend  upon
their origination and servicing policies.
 
    With  respect to Series of Certificates as  to which the Company will act as
Master  Servicer,  the  Master  Servicer  will  pay  all  expenses  incurred  in
connection   with  its  activities  as   Master  Servicer  (subject  to  limited
reimbursement as  described below),  which, unless  otherwise specified  in  the
applicable   Prospectus  Supplement,  will  include  payment  of  the  fees  and
disbursements of the Trustee, payment of premiums of any Mortgage Pool Insurance
Policy, Special  Hazard Insurance  Policy, certificate  insurance policy,  Fraud
Bond  or Bankruptcy Bond or the costs  of obtaining or maintaining any Letter of
Credit or  Reserve Fund  and payment  of expenses  incurred in  connection  with
distributions and reports to Certificateholders of each Series.
 
    With  respect to Series of Certificates as to which the Company will not act
as Master Servicer and the servicing of the Mortgage Loans will be performed  by
the Servicer, the Servicer will pay certain expenses incurred in connection with
its  activities  as  Servicer  (subject to  limited  reimbursement  as described
below),  which,  unless  otherwise   specified  in  the  applicable   Prospectus
Supplement,  will include  payment of  premiums of  any Mortgage  Pool Insurance
Policy, Special  Hazard Insurance  Policy, certificate  insurance policy,  Fraud
Bond  or Bankruptcy  Bond or the  costs of  maintaining any Letter  of Credit or
Reserve Fund. The Certificate Administrator will pay the fees and  disbursements
of the Trustee.
 
    As  set  forth  in  the  preceding  section,  the  Master  Servicer  and the
Seller/Servicers, or the Servicer, as applicable, are entitled to  reimbursement
for  certain expenses  incurred by  them in  connection with  the liquidation of
defaulted Mortgage Loans. Certificateholders of such Series will suffer no  loss
by  reason of such expenses  to the extent claims  are paid under any applicable
credit enhancements. In the event, however, that claims are not paid under  such
policies   or  alternative  coverages,  or   if  coverage  has  been  exhausted,
Certificateholders of such  Series will  suffer a loss  to the  extent that  the
proceeds of liquidation of a defaulted Mortgage Loan, after reimbursement of the
Master   Servicer's  and  the  Seller/Servicer's  expenses,  or  the  Servicer's
expenses, as applicable, are  less than the principal  balance of such  Mortgage
Loan.  In  addition,  the  Master  Servicer  and  the  Seller/Servicers,  or the
Servicer, as applicable, are entitled to reimbursement of expenditures  incurred
by them in connection with the restoration of a damaged Mortgaged Property, such
right  of  reimbursement  being prior  to  the rights  of  Certificateholders to
receive any related Insurance Proceeds or Liquidation Proceeds.
 
EVIDENCE AS TO COMPLIANCE
 
    Except as may  be specified  in the applicable  Prospectus Supplement,  each
Pooling  Agreement  will  provide that  on  or  before April  30  of  each year,
beginning on the first April  30 that is at least  six months after the  Cut-Off
Date,  one  or  more  firms  of  independent  public  accountants  will  furnish
statements to the  Trustee to the  effect that, in  connection with such  firm's
examination of the
 
                                       35
<PAGE>
financial  statements of the Master Servicer  or the Servicer, as applicable, as
of the  previous  December  31,  nothing came  to  such  firm's  attention  that
indicated  that the Master Servicer  or the Servicer, as  applicable, was not in
compliance with specified sections of the Pooling 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.
 
    Except as  may be  provided in  the applicable  Prospectus Supplement,  each
Pooling  Agreement will also  provide for delivery  to the Trustee  of an annual
statement signed  by an  officer of  the  Master Servicer  or the  Servicer,  as
applicable,  to the effect that,  based on a review  of the Master Servicer's or
the Servicer's activities  during the preceding  calendar year, to  the best  of
such officer's knowledge the Master Servicer or the Servicer, as applicable, has
fulfilled  its obligations under the  Pooling Agreement throughout the preceding
year or, if there has been a default in the fulfillment of any such obligations,
specifying each such default and the nature and status thereof.
 
CERTAIN MATTERS REGARDING THE MASTER SERVICER, THE
  SERVICER, THE CERTIFICATE ADMINISTRATOR AND THE COMPANY
 
    Except  as  may  otherwise  be   specified  in  the  applicable   Prospectus
Supplement,  the Pooling Agreement for each Series will provide that the Company
may not resign from its obligations and duties thereunder as Master Servicer  or
Certificate   Administrator,  as   applicable,  or  that   the  Servicer,  where
applicable, may not resign  from its obligations  and duties thereunder,  except
upon  determination that its  duties thereunder are  no longer permissible under
applicable law. No such resignation will become effective until the Trustee or a
successor has assumed the Company's master servicing obligations and duties, or,
where applicable,  the Servicer's  obligations and  duties, under  such  Pooling
Agreement.
 
    The  Pooling Agreement for each Series will provide that neither the Company
nor the Master Servicer, or that, where applicable, neither the Servicer nor the
Certificate Administrator, nor any director,  officer, employee or agent of  the
Company,  the Master  Servicer, the  Servicer and  the Certificate Administrator
(where applicable) (the "Indemnified  Parties") will be  under any liability  to
the  Trust Fund or the Certificateholders or the Trustee, any Seller/Servicer or
others for any action taken by any Indemnified Party, any Seller/Servicer or the
Trustee in  good faith  pursuant to  the  Pooling Agreement,  or for  errors  in
judgment;  provided, however, that neither the Company, the Master Servicer, the
Servicer nor the Certificate Administrator nor any such person will be protected
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  obligations and duties thereunder. The  Pooling
Agreement relating to each such Series will further provide that any Indemnified
Party is entitled to indemnification by the Trust Fund and will be held harmless
against  any loss,  liability or expense  incurred in connection  with any legal
action relating to  the Pooling Agreement  or the Certificates,  other than  any
loss,  liability or  expense related to  any specific Mortgage  Loan or Mortgage
Loans (except  any  such  loss,  liability  or  expense  otherwise  reimbursable
pursuant  to the Pooling Agreement) and  any loss, liability or expense incurred
by reason  of  willful  misfeasance,  bad  faith  or  gross  negligence  in  the
performance  of  duties  thereunder  or  by  reason  of  reckless  disregard  of
obligations and duties thereunder. In  addition, the Pooling Agreement for  each
such  Series will provide that  neither the Company nor  the Master Servicer or,
where applicable, neither  the Servicer  nor the  Certificate Administrator,  is
under any obligation to appear in, prosecute or defend any legal action which is
not  incidental to its responsibilities under the Pooling Agreement and which in
its opinion may  involve it  in any  expense or  liability. The  Company or  the
Master   Servicer  or,  where  applicable,   the  Servicer  or  the  Certificate
Administrator, may, however, in its discretion, undertake any such action  which
it may deem necessary or desirable with respect to the Pooling Agreement and the
rights   and  duties   of  the  parties   thereto  and  the   interests  of  the
Certificateholders thereunder. In such  event, the legal  expenses and costs  of
such  action and any  liability resulting therefrom will  be expenses, costs and
liabilities of the Trust Fund, and the Company or the Master Servicer or,  where
applicable,  the Servicer or the Certificate  Administrator, will be entitled to
be reimbursed therefor and to charge the Certificate Account.
 
    Any person into which the Master  Servicer, the Servicer or the  Certificate
Administrator  may be merged, converted or consolidated, or any person resulting
from any merger, conversion or consolidation  to which the Master Servicer,  the
Servicer or the Certificate Administrator is a party, or
 
                                       36
<PAGE>
any  person succeeding to the  business of the Master  Servicer, the Servicer or
the Certificate Administrator, will be the successor of the Master Servicer, the
Servicer or  the  Certificate  Administrator, respectively,  under  the  Pooling
Agreement.
 
EVENTS OF DEFAULT
 
    With  respect to Series of Certificates as  to which the Company will act as
Master Servicer, events  of Default under  the Pooling Agreement  for each  such
Series, unless otherwise specified in the applicable Prospectus Supplement, will
include,  without limitation, (i) any  failure by the Master  Servicer to make a
required deposit to the  Certificate Account or, if  the Master Servicer is  the
Paying  Agent, to  distribute to  Certificateholders of  any Class  any required
payment which continues  unremedied for  ten days  after the  giving of  written
notice  of such failure to the Master Servicer  by the Trustee, or to the Master
Servicer and  the  Trustee  by  the holders  of  Certificates  for  that  Series
evidencing  interests  aggregating  not less  than  25%  of the  Trust  Fund, as
determined in the manner set forth  in such Pooling Agreement; (ii) any  failure
on  the part of the  Master Servicer duly to observe  or perform in any material
respects any other  of the covenants  or agreements  on the part  of the  Master
Servicer  contained  in the  Certificates  for that  Series  or in  such Pooling
Agreement which continues  unremedied for 60  days after the  giving of  written
notice  of such failure to the Master Servicer  by the Trustee, or to the Master
Servicer and  the  Trustee  by  the holders  of  Certificates  for  that  Series
evidencing  interests  aggregating  not less  than  25%  of the  Trust  Fund, as
determined in the manner set forth in such Pooling Agreement; and (iii)  certain
events   of  insolvency,  readjustment  of   debt,  marshalling  of  assets  and
liabilities or similar proceedings  and certain actions  by the Master  Servicer
indicating  insolvency, reorganization or inability to pay its obligations. With
respect to Series of Certificates as to which the Company will not act as Master
Servicer, the  Events of  Default  under the  Pooling  Agreement for  each  such
Series, unless otherwise specified in the applicable Prospectus Supplement, will
be  the  same failures  by  or conditions  of  the Servicer  or  the Certificate
Administrator as will constitute Events of Default by the Master Servicer  under
the Pooling Agreement for each Series of Certificates for which the Company will
act  as Master Servicer, except that an Event of Default created by a failure of
the Master  Servicer to  make  a required  deposit  to the  Certificate  Account
referred  to in clause (i) of the immediately prior sentence will instead be the
failure of the Servicer to make a required deposit to the Investment Account  on
the Withdrawal Date.
 
RIGHTS UPON EVENT OF DEFAULT
 
    As  long as an Event  of Default under the  Pooling Agreement for any Series
remains unremedied,  the Trustee  or  holders of  Certificates for  that  Series
evidencing  interests  aggregating  not less  than  25%  of the  Trust  Fund, as
determined in the manner set forth in such Pooling Agreement, may terminate  all
of  the  rights and  obligations of  the  Master Servicer,  the Servicer  or the
Certificate Administrator, as  applicable, under such  Pooling Agreement and  in
and  to  the  Trust  Fund,  whereupon  the  Trustee  will  succeed  to  all  the
responsibilities, duties and liabilities of the Master Servicer, the Servicer or
the Certificate Administrator, as applicable,  under such Pooling Agreement  and
will  be  entitled  to  similar  compensation  arrangements  and  limitations on
liability. In the event that  the Trustee is unwilling or  unable so to act,  it
may appoint or petition a court of competent jurisdiction for the appointment of
a  housing and home finance institution with a net worth of at least $10,000,000
to act as  successor to  the Master Servicer,  the Servicer  or the  Certificate
Administrator,  as applicable,  under such  Pooling Agreement.  Pending any such
appointment, the Trustee is obligated to act in such capacity. In the event  the
Trustee  acts as successor to  the Master Servicer or  the Servicer, the Trustee
will be obligated to make Advances unless it is prohibited by law from doing so.
The Trustee and such successor may agree upon the compensation to be paid, which
in no event  may be greater  than the  compensation to the  Company, as  initial
Master  Servicer, or with  respect to a  Series of Certificates  as to which the
Company will not act as Master Servicer, to the Servicer named in the applicable
Prospectus Supplement  or the  Certificate Administrator,  as applicable,  under
such  Pooling Agreement. Subject to certain limitations, holders of Certificates
for a Series  evidencing interests aggregating  not less than  25% of the  Trust
Fund,  as determined in the  manner set forth in  the Pooling Agreement for that
Series, may direct the action of the Trustee in pursuing remedies and exercising
powers under such Pooling Agreement.
 
    No Certificateholder of any Series will have any right under the  applicable
Pooling  Agreement  to institute  any proceeding  with  respect to  such Pooling
Agreement unless such Certificateholder
 
                                       37
<PAGE>
previously has given  to the Trustee  written notice of  default and unless  the
holders  of Certificates  for that  Series evidencing  interests aggregating not
less than 25% of the Trust Fund, as  determined in the manner set forth in  such
Pooling  Agreement, have made written request upon the Trustee to institute such
proceeding in its own name as Trustee thereunder and have offered to the Trustee
reasonable indemnity and  the Trustee for  60 days has  neglected or refused  to
institute  any such proceeding.  However, the Trustee is  under no obligation to
exercise any of the trusts or powers  vested in it by the Pooling Agreement  for
any  Series or  to make  any investigation of  matters arising  thereunder or to
institute, conduct or defend any litigation thereunder or in relation thereto 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.
 
AMENDMENT
 
    The  Pooling Agreement for each Series may be amended by the Company and the
Trustee, with respect to Series of Certificates as to which the Company will act
as  Master  Servicer,  and  by  the  Company,  the  Servicer,  the   Certificate
Administrator and the Trustee with respect to Series of Certificates as to which
the  Company will not act as Master Servicer,  without the consent of any of the
Certificateholders covered by such Pooling Agreement, (i) to cure any ambiguity,
(ii) to correct or  supplement any provision therein  which may be  inconsistent
with  any other provision therein, (iii) to comply with any requirements imposed
by the Internal Revenue Code of 1986, as amended (the "Code") or any regulations
thereunder, including  provisions  to  such  extent as  shall  be  necessary  to
maintain  the qualification of the Trust Fund as a REMIC or to avoid or minimize
the risk of imposition of any tax on the related Trust Fund, and (iv) to correct
the description of any property  at any time included in  the Trust Fund, or  to
assure conveyance to the Trustee of any property included in the Trust Fund. The
Pooling  Agreement for each  Series may also  be amended by  the Company and the
Trustee, with respect to Series of Certificates as to which the Company will act
as  Master  Servicer,  and  by  the  Company,  the  Servicer,  the   Certificate
Administrator and the Trustee with respect to Series of Certificates as to which
the  Company will not act as Master Servicer, with the consent of the holders of
Certificates for that Series evidencing interests aggregating not less than  66%
of  the  Trust Fund,  as  determined in  the manner  set  forth in  such Pooling
Agreement, for the purpose of adding any provisions to or changing in any manner
or eliminating any of the provisions  of such Pooling Agreement or of  modifying
in  any  manner  the rights  of  the  holders of  Certificates  of  that Series;
provided, however,  that no  such amendment  may (i)  reduce in  any manner  the
amount of, or delay the timing of, payments received on Mortgage Loans which are
required  to be distributed in respect of any Certificate without the consent of
the holder  of such  Certificate, or  (ii) reduce  the aforesaid  percentage  of
Certificates, the holders of which are required to consent to any such amendment
without  the consent  of the  holders of  all Certificates  of such  Series then
outstanding.
 
    The Prospectus  Supplement for  a particular  Series may  describe other  or
different  provisions  concerning conditions  to  the amendment  of  the related
Pooling Agreement.
 
LIST OF CERTIFICATEHOLDERS
 
    With respect to Series of Certificates as  to which the Company will act  as
Master  Servicer, upon written request of  the Trustee, the Master Servicer will
provide to the Trustee within 30 days  after the receipt of such request a  list
of  the names and addresses of all  Certificateholders of record of a particular
Series or Class as of the most  recent Record Date for payment of  distributions
to  Certificateholders of that Series or Class. Upon written request of three or
more Certificateholders of record of such a Series of Certificates, for purposes
of communicating  with other  Certificateholders with  respect to  their  rights
under  the  Pooling Agreement  for  such Series,  the  Trustee will  afford such
Certificateholders access  during business  hours  to the  most recent  list  of
Certificateholders  of that Series held by the Trustee.  If such list is as of a
date more than 90 days prior to the date of receipt of such  Certificateholders'
request,  the Trustee shall promptly request  from the Master Servicer a current
list and  will afford  such requesting  Certificateholders access  to such  list
promptly  upon receipt. With respect  to Series of Certificates  as to which the
Company  will  not  act  as   Master  Servicer,  the  Company,  as   Certificate
Administrator,   will  provide   the  list  of   names  and   addresses  of  the
Certificateholders described above in the same manner as so described.
 
                                       38
<PAGE>
TERMINATION
 
    The obligations  created  by the  Pooling  Agreement for  each  Series  will
terminate  upon the occurrence  of both (i)  the later of  the maturity or other
liquidation of the last Mortgage Loan subject thereto and the disposition of all
property acquired upon foreclosure of any Mortgage Loan and (ii) the payment  to
Certificateholders  of each Class, if any, of that Series of all amounts held on
behalf of such Certificateholders  and required to be  paid to them pursuant  to
such  Pooling Agreement. The Pooling Agreement  for each Series will permit, but
not require, the Company to repurchase from  the Trust Fund for such Series  all
remaining Mortgage Loans at a price equal to the unpaid principal amount thereof
or  the Trust Fund's adjusted  basis in the Mortgage  Loans, as described in the
related Prospectus  Supplement, in  either case  together with  interest at  the
applicable  Mortgage Interest Rates  (which will generally  be passed through to
Certificateholders at the applicable Pass-Through  Rates). The exercise of  such
right  will effect early retirement of the  Certificates of such Series, but the
Company's right so to repurchase is subject to the aggregate principal  balances
of  the Mortgage Loans at the time  of repurchase being less than the percentage
specified in the related Prospectus Supplement of the aggregate principal amount
of the  Mortgage Loans  underlying the  Certificates of  such Series  as of  the
Cut-Off  Date.  In no  event, however,  will  the trust  created by  any Pooling
Agreement continue  beyond the  expiration of  21 years  from the  death of  the
survivor  of the issue of  the person named in  such Pooling Agreement. For each
Series, the  Trustee will  give written  notice of  termination of  the  Pooling
Agreement  to each  Certificateholder, and the  final distribution  will be made
only upon surrender and cancellation of the Certificates at an office or  agency
specified in the notice of termination.
 
THE TRUSTEE
 
    The  Trustee  under each  Pooling  Agreement will  be  named in  the related
Prospectus Supplement. The  bank or trust  company serving as  Trustee may  have
normal banking relationships with the Company and/or its affiliates. The Trustee
will have combined capital and surplus of not less than $50 million.
 
    The  Trustee under each Pooling  Agreement may resign at  any time, in which
event the Company will be obligated to appoint a successor Trustee. The  Company
may  also remove the Trustee if the Trustee ceases to be eligible to continue as
such under the applicable Pooling Agreement or if the capital and surplus of the
Trustee is reduced below $50 million. Upon becoming aware of such circumstances,
the Company will  be obligated to  appoint a successor  Trustee for the  related
Series.  The Trustee may also be removed  at any time by holders of Certificates
of a Series evidencing more than 50% of the aggregate undivided interests in the
related Trust Fund. Any resignation or removal of the Trustee and appointment of
a  successor  Trustee  will  not  become  effective  until  acceptance  of   the
appointment by the successor Trustee.
 
             PRIMARY INSURANCE, FHA MORTGAGE INSURANCE, VA MORTGAGE
                 GUARANTY, HAZARD INSURANCE; CLAIMS THEREUNDER
 
    As  set forth  below, a  Mortgage Loan may  be required  to be  covered by a
hazard insurance policy and either an FHA  Insurance Policy, a VA Guaranty or  a
Primary  Insurance Policy.  The following  is only  a brief  description of such
coverage and does  not purport to  describe all of  the characteristics of  each
type  of insurance.  Such insurance is  subject to underwriting  and approval of
individual Mortgage Loans  by the  respective insurers and  guarantors. In  some
cases,   however,  the  issuer  of  the   insurance  or  guaranty  may  delegate
underwriting authority to the originator of the Mortgage Loan. The  descriptions
of any insurance coverage in this Prospectus or any Prospectus Supplement do not
purport  to be complete and are qualified in their entirety by reference to such
forms of policies, and to such statutes or regulations as may be applicable.
 
PRIMARY INSURANCE
 
    Unless otherwise  specified in  the applicable  Prospectus Supplement,  each
Mortgage  Loan with a loan-to-value ratio at origination and at the Cut-Off Date
greater than  80%  will be  covered  by  a Primary  Insurance  Policy  providing
insurance  coverage against default on such Mortgage  Loan, in general, of up to
25% of the principal balance of such Mortgage Loan with maintenance requirements
in certain cases  for the remaining  term of  such Mortgage Loan,  but at  least
until the loan-to-value
 
                                       39
<PAGE>
ratio  drops to 80%. Conversely, Mortgage  Loans with lower loan-to-value ratios
(up to approximately 80%) may not be covered by any Primary Insurance  Policies.
Applicable state laws may in some instances limit the maximum coverage which may
be  obtained with  respect to  certain Mortgage Loans.  Any such  policy will be
issued by a Qualified Insurer.
 
    While the  terms  and conditions  of  the Primary  Insurance  Policies  will
differ,  each Primary Insurance Policy will in general provide substantially the
following coverage.  The  amount of  the  loss  as calculated  under  a  Primary
Insurance  Policy covering  a Mortgage Loan  (herein referred to  as the "Loss")
will generally consist of the unpaid principal balance of such Mortgage Loan and
accrued and unpaid interest thereon and reimbursement of certain expenses,  less
(i) rents or other payments collected or received by the insured (other than the
proceeds  of  hazard  insurance) that  are  derived from  the  related Mortgaged
Property, (ii) hazard  insurance proceeds in  excess of the  amount required  to
restore  such Mortgaged Property and which have  not been applied to the payment
of the Mortgage  Loan, (iii)  certain amounts expended  by the  insured but  not
approved  by the insurer,  (iv) claim payments previously  made on such Mortgage
Loan and (v) unpaid premiums and certain other amounts.
 
    The issuer of a Primary Insurance  Policy will generally be required to  pay
either:  (i) the insured percentage  of the Loss; (ii)  the entire amount of the
Loss, after  receipt by  the insurer  of  good and  merchantable title  to,  and
possession  of, the Mortgaged  Property; or (iii)  at the option  of the insurer
under certain  Primary Insurance  Policies, the  sum of  the delinquent  monthly
payments  plus any advances made  by the insured, both to  the date of the claim
payment and, thereafter, monthly payments in  the amount that would have  become
due under the Mortgage Loan if it had not been discharged plus any advances made
by  the insured until the  earlier of (a) the date  the Mortgage Loan would have
been discharged in full if the default had not occurred or (b) an approved sale.
 
    As conditions precedent to the filing or payment of a claim under a  Primary
Insurance  Policy, in the  event of default  by the Mortgagor,  the insured will
typically be required,  among other  things, to:  (i) advance  or discharge  (a)
hazard  insurance premiums and (b)  as necessary and approved  in advance by the
insurer, real estate taxes, protection and preservation expenses and foreclosure
and related costs;  (ii) in  the event  of any physical  loss or  damage to  the
Mortgaged  Property,  have  the  Mortgaged Property  restored  to  at  least its
condition at the effective date of  the Primary Insurance Policy (ordinary  wear
and  tear excepted); and (iii) tender to the insurer good and merchantable title
to, and  possession  of, the  Mortgaged  Property. If  any  Advance to  be  made
(including  expenses  to be  paid) by  the  Master Servicer  as a  condition for
coverage of a loss by  a Primary Insurance Policy is  not so made by the  Master
Servicer because the such Advance has been determined to be nonrecoverable, then
such  loss  will be  allocated to  the  Certificateholders. See  "Description of
Certificates--Advances".
 
    For any Certificates offered hereunder, the Master Servicer will cause  each
Servicer  to maintain, or with  respect to a Series  of Certificates as to which
the Company will not act as Master Servicer, the Servicer will maintain, in full
force and effect  and to the  extent coverage is  available a Primary  Insurance
Policy  with regard to  each Mortgage Loan  for which such  coverage is required
under the standard described above, provided that such Primary Insurance  Policy
was  in place  as of  the Cut-Off  Date and  the Company  had knowledge  of such
Primary Insurance Policy. With respect to Series of Certificates as to which the
Company will  act as  Master Servicer,  in the  event that  the Master  Servicer
learns  that a Mortgage Loan had a  loan-to-value ratio at origination and as of
the Cut-Off Date in excess of 80% and was not the subject of a Primary Insurance
Policy (and was not included in any exception to such standard disclosed in  the
related  Prospectus Supplement), then the Master Servicer is required to use its
reasonable efforts to  obtain and  maintain a  Primary Insurance  Policy to  the
extent  that such a policy is obtainable  at a reasonable price. With respect to
Series of Certificates as to which the Company will not act as Master  Servicer,
in  the event  the Servicer  learns of  the lack  of a  Primary Insurance Policy
described in the preceding sentence, the  Servicer shall notify the Trustee  who
shall  require the Seller  to obtain a Primary  Insurance Policy, repurchase the
Mortgage Loan or substitute  a mortgage loan for  the applicable Mortgage  Loan.
The Master Servicer or the Servicer, as applicable, will not cancel or refuse to
renew  any such Primary  Insurance Policy in  effect at the  time of the initial
issuance of a Series of Certificates that is required to be kept in force  under
the  applicable  Pooling Agreement  unless,  in the  event  that such  Series of
Certificates was  rated  at  the  time  of  issuance,  the  replacement  Primary
Insurance    Policy   from    such   cancelled   or    non-renewed   policy   is
 
                                       40
<PAGE>
maintained with  an insurer  whose claims-paying  ability is  acceptable to  the
rating  agency or agencies  that rated such Series  of Certificates for mortgage
pass-through  certificates  having  a  rating  equal  to  or  better  than   the
then-current ratings of such series of Certificates.
 
    Evidence  of each Primary  Insurance Policy will be  provided to the Trustee
simultaneously with the transfer  to the Trustee of  the related Mortgage  Loan.
With  respect to  Series of  Certificates as  to which  the Company  will act as
Master Servicer, under the Selling and Servicing Contract each Seller/ Servicer,
on behalf  of itself,  the Company,  the Master  Servicer, the  Trustee and  the
Certificateholders,  will be required to present claims to the insurer under any
Primary Insurance Policy  and take  such reasonable  steps as  are necessary  to
permit  recovery thereunder  with respect  to defaulted  Mortgage Loans. Amounts
collected by  a Seller/Servicer  under such  Primary Insurance  Policy shall  be
deposited in the Custodial Account for P&I maintained by such Seller/Servicer on
behalf   of   the   Company,  the   Master   Servicer,  the   Trustee   and  the
Certificateholders. The Master Servicer will agree to cause each Seller/Servicer
not to cancel or  refuse to renew  any Primary Insurance  Policy required to  be
kept  in force by the Pooling Agreement.  With respect to Series of Certificates
as to which  the Company  will not  act as  Master Servicer,  under the  Pooling
Agreement  the Servicer will agree not to  cancel or refuse to renew any Primary
Insurance Policy and will be required to present claims to the insurer under any
such Primary Insurance  Policy, take  steps to  permit recovery  under any  such
Primary  Insurance  Policy  and  deposit  amounts  collected  thereunder  in the
Custodial Account for P&I  to the same  extent as a  Seller/Servicer will be  so
required under a Selling and Servicing Contract.
 
    See "Description of Credit Enhancements--The Fraud Bond" for a discussion of
the  possible  effect of  fraudulent conduct  or negligence  by the  Seller, the
Seller/Servicer or the Mortgagor with respect to a Mortgage Loan on the coverage
of a Primary Insurance Policy.
 
FHA MORTGAGE INSURANCE
 
    The National Housing Act of 1934, as amended (the "Housing Act"), authorizes
various FHA  mortgage insurance  programs. Some  of the  Mortgage Loans  may  be
insured  under either Section 203(b), Section 234  or Section 235 of the Housing
Act. Under  Section  203(b), FHA  insures  mortgage loans  of  up to  30  years'
duration  for the purchase of one- to four-family dwelling units. Mortgage loans
for the purchase  of condominium  units are insured  by FHA  under Section  234.
Loans  insured under these programs  must bear interest at  a rate not exceeding
the maximum rate in effect at the time  the loan is made, as established by  the
United  States Department of Housing and  Urban Development ("HUD"), and may not
exceed specified  percentages  of the  lesser  of  the appraised  value  of  the
property  and the sales price, less seller  paid closing costs for the property,
up to certain specified  maximums. In addition,  FHA imposes initial  investment
minimums  and other  requirements on  mortgage loans  insured under  the Section
203(b) and Section 234 programs.
 
    Under Section 235, assistance payments are  paid by HUD to the mortgagee  on
behalf  of eligible  mortgagors for  as long  as the  mortgagors continue  to be
eligible for the payments. To be eligible, a mortgagor must be part of a family,
must have income  within the limits  prescribed by  HUD at the  time of  initial
occupancy,   must   occupy  the   property  and   must  meet   requirements  for
recertification at least annually.
 
    The regulations governing these programs provide that insurance benefits are
payable either (i)  upon foreclosure  (or other acquisition  of possession)  and
conveyance  of the  mortgaged premises  to HUD  or (ii)  upon assignment  of the
defaulted mortgage loan  to HUD. The  FHA insurance that  may be provided  under
these  programs upon  conveyance of  the home  to HUD  is equal  to 100%  of the
outstanding principal balance of  the mortgage loan,  plus accrued interest,  as
described  below, and certain additional costs and expenses. When entitlement to
insurance benefits results  from assignment  of the  mortgage loan  to HUD,  the
insurance  payment is computed as of the date of the assignment and includes the
unpaid principal amount of the mortgage loan plus mortgage interest accrued  and
unpaid to the assignment date.
 
    When  entitlement to insurance  benefits results from  foreclosure (or other
acquisition of possession) and conveyance, the insurance payment is equal to the
unpaid principal  amount  of  the  mortgage  loan,  adjusted  to  reimburse  the
mortgagee  for certain  tax, insurance  and similar payments  made by  it and to
deduct certain amounts received or retained by the mortgagee after default, plus
reimbursement not to exceed two-thirds of the mortgagee's foreclosure costs.
 
                                       41
<PAGE>
VA MORTGAGE GUARANTY
 
    The Servicemen's Readjustment  Act of  1944, as amended,  permits a  veteran
(or, in certain instances, his or her spouse) to obtain a mortgage loan guaranty
by  the VA covering mortgage  financing of the purchase  of a one-to four-family
dwelling unit to  be occupied  as the  veteran's home  at an  interest rate  not
exceeding  the  maximum  rate  in  effect  at the  time  the  loan  is  made, as
established by HUD. The program has no  limit on the amount of a mortgage  loan,
requires no down payment from the purchaser and permits the guaranty of mortgage
loans  with terms limited by the estimated  economic life of the property, up to
30 years. The maximum guaranty that may  be issued by the VA under this  program
is  50% of the  original principal amount of  the mortgage loan  up to a certain
dollar limit  established  by  the  VA. The  loan-to-value  ratios  allowed  for
VA-guaranteed  loans are set forth in the  FNMA Seller's Guide. The liability on
the guaranty is reduced or increased pro rata with any reduction or increase  in
the  amount of  indebtedness, but  in no  event will  the amount  payable on the
guaranty exceed the amount of the original guaranty. Notwithstanding the  dollar
and percentage limitations of the guaranty, a mortgagee will ordinarily suffer a
monetary loss only where the difference between the unsatisfied indebtedness and
the  proceeds of a  foreclosure sale of  mortgaged premises is  greater than the
original guaranty as adjusted. The VA may, at its option, and without regard  to
the  guaranty, make full payment to  a mortgagee of the unsatisfied indebtedness
on a mortgage upon its assignment to the VA.
 
    Since there is  no limit  imposed by  the VA on  the principal  amount of  a
VA-guaranteed  mortgage  loan but  there  is a  limit on  the  amount of  the VA
guaranty, additional coverage under a  Primary Insurance Policy may be  required
by the Company for VA loans in excess of certain amounts. The amount of any such
additional coverage will be set forth in the related Prospectus Supplement.
 
HAZARD INSURANCE
 
    Unless  otherwise specified  in the  applicable Prospectus  Supplement, each
Seller/Servicer with respect to Series of  Certificates as to which the  Company
will  act  as  Master  Servicer,  or the  Servicer  with  respect  to  Series of
Certificates as to which the Company will not act as Master Servicer, will cause
to be  maintained for  each  Mortgage Loan  (other  than Cooperative  Loans  and
Mortgage  Loans secured  by condominium  apartments) that  it services  a hazard
insurance policy providing for no less than the coverage of the standard form of
fire insurance policy with extended coverage customary in the state in which the
Mortgaged Property is located. Such coverage will be in an amount not less  than
the  maximum insurable value of the Mortgaged Property or the original principal
balance of  such Mortgage  Loan, whichever  is  less. As  set forth  above,  all
amounts  collected by the Master Servicer or a Seller/Servicer, or the Servicer,
as applicable, under any hazard policy (except for amounts to be applied to  the
restoration  or repair of the Mortgaged Property or released to the Mortgagor in
accordance  with  the  Seller/Servicer's  or  the  Servicer's  normal  servicing
procedures)  will be deposited  in the Custodial  Account for P&I.  In the event
that the Master Servicer or the Seller/Servicer, or the Servicer, as applicable,
maintains a blanket policy insuring against hazard losses on all of the Mortgage
Loans, it shall conclusively be deemed to have satisfied its obligation relating
to the  maintenance of  hazard  insurance. Such  blanket  policy may  contain  a
deductible  clause, in which case the Master Servicer or the Seller/Servicer, or
the Servicer, as applicable,  will deposit in the  Custodial Account for P&I  or
the Certificate Account all sums which would have been deposited therein but for
such  clause. The Master Servicer and  each of the Seller/Servicers with respect
to Series of Certificates as to which  the Company will act as Master  Servicer,
or  the Servicer with respect to Series  of Certificates as to which the Company
will not act as Master  Servicer, are required to  maintain a fidelity bond  and
errors and omissions policy with respect to officers and employees which provide
coverage  against losses which may  be sustained as a  result of an officer's or
employee's misappropriation  of funds  or  errors and  omissions in  failing  to
maintain  insurance, subject  to certain limitations  as to  amount of coverage,
deductible amounts,  conditions,  exclusions and  exceptions  in such  form  and
amount  as  specified in  the Servicing  Contract or  the Pooling  Agreement, as
applicable.
 
    In general, the standard  form of fire and  extended coverage policy  covers
physical  damage to or destruction of the  improvements on the property by fire,
lightning, explosion,  smoke, windstorm  and hail,  and riot,  strike and  civil
commotion,  subject  to the  conditions  and exclusions  particularized  in each
policy.  Although  the  policies  relating   to  the  Mortgage  Loans  will   be
underwritten by different insurers under different state laws in accordance with
different applicable state forms and therefore
 
                                       42
<PAGE>
will  not contain  identical terms and  conditions, the basic  terms thereof are
dictated by respective state laws, and most such policies typically do not cover
any physical damage resulting from the following: war, revolution,  governmental
actions,  floods  and  other  water-related  causes,  earth  movement (including
earthquakes, landslides  and mud  flows),  nuclear reactions,  wet or  dry  rot,
vermin,  rodents,  insects or  domestic animals,  theft  and, in  certain cases,
vandalism. The foregoing list is merely indicative of certain kinds of uninsured
risks and is not intended to be all-inclusive. The Company may require Mortgaged
Properties in  certain  locations  to  be  covered  by  policies  of  earthquake
insurance,  to the extent it is reasonably  available. When any improvement to a
Mortgaged Property is  located in  a designated flood  area and  in a  community
which  participates  in the  National  Flood Insurance  Program  at the  time of
origination of the related  Mortgage Loan, and flood  insurance is required  and
available,  the  Pooling Agreement  requires  the Master  Servicer,  through the
Seller/Servicer responsible for servicing such  Mortgage Loan, or the  Servicer,
as applicable, to cause the Mortgagor to acquire and maintain such insurance.
 
    The  hazard insurance  policies covering the  Mortgaged Properties typically
contain a clause which, in  effect, requires the insured  at all times to  carry
insurance  of  a  specified  percentage  (generally  80%  to  90%)  of  the full
replacement value of the  improvements on the property  in order to recover  the
full  amount of  any partial  loss. If the  insured's coverage  falls below this
specified percentage, such clause provides  that the insurer's liability in  the
event  of partial loss does not exceed the larger of (i) the replacement cost of
the improvements less  physical depreciation,  and (ii) such  proportion of  the
loss,  without deduction  for depreciation, as  the amount  of insurance carried
bears to  the  specified  percentage  of  the  full  replacement  cost  of  such
improvements.
 
    Neither  the Seller/Servicer  with respect to  Series of  Certificates as to
which the Company will act as Master  Servicer, or the Servicer with respect  to
Series  of Certificates as to which the Company will not act as Master Servicer,
will require  that a  hazard or  flood insurance  policy be  maintained for  any
Cooperative  Loan  or Mortgage  Loan secured  by  a condominium  apartment. With
respect to a Cooperative Loan,  generally the Cooperative itself is  responsible
for  maintenance of hazard insurance for  the property owned by the Cooperative,
and the tenant-stockholders of the Cooperative do not maintain individual hazard
insurance policies. To the extent, however,  that a Cooperative and the  related
borrower on a Cooperative Note do not maintain such insurance or do not maintain
adequate  coverage or any insurance proceeds  are not applied to the restoration
of the damaged property, damage to such borrower's cooperative apartment or such
Cooperative's building could  significantly reduce the  value of the  collateral
securing  such Cooperative Note.  With respect to  a Mortgage Loan  secured by a
condominium apartment,  the  condominium  owner's association  for  the  related
building  generally is responsible for maintenance  of hazard insurance for such
building, and the condominium owners do not maintain individual hazard insurance
policies. To  the  extent  that the  owner  of  a Mortgage  Loan  secured  by  a
condominium  apartment and  the related  condominium owner's  association do not
maintain such insurance or  do not maintain adequate  coverage or any  insurance
proceeds  are not applied to the restoration  of the damaged property, damage to
such  borrower's   condominium  apartment   or   the  related   building   could
significantly reduce the value of the Mortgaged Property.
 
    Since   the  amount  of   hazard  insurance  the   Master  Servicer  or  the
Seller/Servicers, or the Servicer, as applicable, will cause to be maintained on
the Mortgaged Properties declines as the principal balances owing on the related
Mortgage Loans  decrease, and  since  residential properties  have  historically
appreciated  in value over time, in the  event of partial loss, hazard insurance
proceeds may  be  insufficient  to  restore  fully  the  damaged  property.  See
"Description   of  Credit   Enhancements--  Special  Hazard   Insurance"  for  a
description of the limited protection  afforded by the Special Hazard  Insurance
Policy,  Letter of Credit  or Reserve Fund,  if any is  obtained, against losses
occasioned by certain hazards which are otherwise uninsured against, as well  as
against  losses  caused  by  the  application of  the  clause  described  in the
preceding paragraph.
 
    Any losses incurred with  respect to Mortgage Loans  due to uninsured  risks
(including  earthquakes, mudflows  and floods) or  insufficient hazard insurance
proceeds could affect distributions to the Certificateholders.
 
                                       43
<PAGE>
                       DESCRIPTION OF CREDIT ENHANCEMENTS
 
    To the  extent  provided in  the  applicable Prospectus  Supplement,  credit
enhancement  for each Series of Certificates may  be comprised of one or more of
the following  components,  each of  which  will  have a  dollar  limit.  Credit
enhancement  components may include coverage with respect to losses that are (i)
attributable to the  Mortgagor's failure  to make  any payment  of principal  or
interest  as required under the Mortgage  Note, but not including Special Hazard
Losses, Extraordinary Losses (as defined  below) or other losses resulting  from
damage  to a  Mortgaged Property,  Bankruptcy Losses  or Fraud  Losses (any such
loss, a  "Defaulted Mortgage  Loss"); (ii)  of  a type  generally covered  by  a
Special  Hazard Insurance Policy (any such loss, a "Special Hazard Loss"); (iii)
attributable to certain  actions which  may be taken  by a  bankruptcy court  in
connection  with a Mortgage Loan, including a reduction by a bankruptcy court of
the principal balance of or the Mortgage Interest Rate on a Mortgage Loan or  an
extension of its maturity (any such loss, a "Bankruptcy Loss"); (iv) incurred on
defaulted  Mortgage Loans as to which there was fraudulent conduct or negligence
by either the  Seller, the  Seller/Servicer, the  Servicer or  the Mortgagor  in
connection  with such Mortgage  Loans (any such  loss, a "Fraud  Loss"); and (v)
attributable to shortfalls in the payment of amounts due to one or more  Classes
of   Certificates.  Losses  occasioned  by   war,  civil  insurrection,  certain
governmental  actions,  nuclear  reaction,  chemical  contamination,  errors  in
design,   faulty   workmanship  or   materials   or  waste   by   the  Mortgagor
("Extraordinary Losses") will  not be  covered. To  the extent  that the  credit
enhancement  for any Series of Certificates is exhausted, the Certificateholders
will bear all further risks of loss not otherwise insured against.
 
    As set forth below and in the applicable Prospectus Supplement, (i) coverage
with respect to Defaulted Mortgage  Losses may be provided by  one or more of  a
Letter  of  Credit,  Reserve Fund  or  a  Mortgage Pool  Insurance  Policy, (ii)
coverage with respect to Special Hazard Losses may be provided by one or more of
a Letter  of Credit,  Reserve Fund  or a  Special Hazard  Insurance Policy  (any
instrument,   to  the  extent   providing  such  coverage,   a  "Special  Hazard
Instrument"); (iii) coverage with respect  to Bankruptcy Losses may be  provided
by  one or  more of  a Letter of  Credit, Reserve  Fund or  Bankruptcy Bond (any
instrument, to the  extent providing such  coverage, a "Bankruptcy  Instrument")
and (iv) coverage with respect to Fraud Losses may be provided by one or more of
a  Letter of Credit, Reserve  Fund or Fraud Bond  (any instrument, to the extent
providing such coverage, a "Fraud Instrument"). In addition, if provided in  the
applicable Prospectus Supplement, in lieu of or in addition to any or all of the
foregoing  arrangements, credit enhancement may be  in the form of subordination
of one or more Classes of Certificates to provide credit support to one or  more
other Classes of Certificates.
 
    The  amounts and  types of  credit enhancement  arrangements as  well as the
provider thereof, if  applicable, with  respect to each  Series of  Certificates
will  be set forth in the related  Prospectus Supplement. To the extent provided
in the applicable Prospectus  Supplement and the  Pooling Agreement, the  credit
enhancement  arrangements may be periodically  modified, reduced and substituted
for based on the aggregate outstanding  principal balance of the Mortgage  Loans
covered  thereby. If specified  in the applicable  Prospectus Supplement, credit
support for a  Series of  Certificates may  cover one  or more  other series  of
certificates issued by the Company or others.
 
    Unless  otherwise specified in the  applicable Prospectus Supplement, to the
extent permitted by  any applicable  rating agency  and provided  that the  then
current  ratings of the  Certificates are maintained,  coverage under any credit
enhancement may be cancelled or reduced.
 
    The descriptions  of any  credit enhancement  instruments included  in  this
Prospectus  or  any Prospectus  Supplement and  the  coverage thereunder  do not
purport to be complete and are qualified  in their entirety by reference to  the
actual forms of governing documents, copies of which are available upon request.
 
MORTGAGE POOL INSURANCE
 
    A  Mortgage Pool Insurance Policy may be obtained for a particular Series of
Certificates. Any such policy will be  obtained by the Company or the  Servicer,
as  applicable, from a Qualified Insurer for the Mortgage Pool, covering loss by
reason of the default  in payments on any  Mortgage Loans included therein  that
are  not covered  as to their  entire outstanding principal  balances by Primary
Insurance, FHA Insurance or VA  Guarantees. Each Mortgage Pool Insurance  Policy
will cover all or a portion of
 
                                       44
<PAGE>
those  Mortgage Loans  in a Mortgage  Pool in an  amount to be  specified in the
applicable Prospectus Supplement or in the  related Current Report on Form  8-K.
The  term "Mortgage Pool  Insurance Policy" wherever used  in this Prospectus or
any Supplement shall refer to one or more such Mortgage Pool Insurance  Policies
as  the context may require. The identity of the insurer or insurers and certain
financial information with respect to the insurer or insurers for each  Mortgage
Pool will be contained in the applicable Prospectus Supplement or in the related
Current  Report on  Form 8-K. The  Trustee will  be the named  insured under any
Mortgage Pool  Insurance Policy.  A  Mortgage Pool  Insurance  Policy is  not  a
blanket policy against loss, since claims thereunder may only be made respecting
particular  defaulted Mortgage Loans  and only upon  the satisfaction of certain
conditions precedent described below.
 
    Any Mortgage Pool Insurance Policy will provide that no claim may be validly
presented thereunder unless (i)  hazard insurance on  the property securing  the
defaulted  Mortgage Loan has been kept in  force and real estate taxes and other
protection and preservation  expenses have  been paid,  (ii) if  there has  been
physical  loss or damage to the Mortgaged  Property, it has been restored to its
condition (reasonable wear  and tear excepted)  at the Cut-Off  Date, (iii)  any
required  Primary Insurance Policy is in  effect for the defaulted Mortgage Loan
and a claim thereunder has been submitted and settled, and (iv) the insured  has
acquired good and merchantable title to the Mortgaged Property free and clear of
liens   except  permitted  encumbrances.  Assuming  the  satisfaction  of  these
conditions, the insurer will have the option to either (i) purchase the property
securing the defaulted Mortgage Loan at  a price equal to the principal  balance
thereof,  plus accrued and unpaid interest at  the Mortgage Interest Rate to the
date of purchase, less  the amount of  any loss paid  under a Primary  Insurance
Policy, if any, or (ii) pay the difference between the proceeds received from an
approved  sale  of  the property  and  the  principal balance  of  the defaulted
Mortgage Loan, plus accrued and unpaid interest at the Mortgage Interest Rate to
the date of  payment of the  claim, less the  amount of such  loss paid under  a
Primary  Insurance Policy, if any. In each  case, the insurer will reimburse the
Master Servicer and the Seller/Servicer, or the Servicer with respect to  Series
of  Certificates for  which the  Company will  not act  as Master  Servicer, for
certain expenses incurred by them.
 
    An endorsement  (an  "Advance Claims  Endorsement")  may be  issued  to  any
Mortgage  Pool  Insurance  Policy  which provides  that  the  Insurer  will make
advances of monthly  principal and  interest payments  on Mortgage  Loans as  to
which   the  Seller/Servicer,  or  the  Servicer   with  respect  to  Series  of
Certificates for which  the Company  will not act  as Master  Servicer, has  not
received  a payment from  the related Mortgagor  and neither the Seller/Servicer
nor the  Master Servicer,  or the  Servicer, as  applicable, has  advanced  such
payment.  The presence  of such  endorsement, if any,  will be  disclosed in the
Prospectus Supplement.
 
    An endorsement may  also be  issued to  any Mortgage  Pool Insurance  Policy
which  provides that  the insurer will  pay claims presented  under the Mortgage
Pool Insurance  Policy  although  claims made  against  the  applicable  Primary
Insurance  Policy  have  not been  settled  due to  the  insolvency, bankruptcy,
receivership or assignment  for the benefit  of creditors of  the issuer of  the
Primary  Insurance Policy.  The presence  of such  endorsement, if  any, will be
disclosed in the Prospectus Supplement.
 
    Unless otherwise specified in the  applicable Prospectus Supplement, to  the
extent  permitted by  any applicable  rating agency  and provided  that the then
current ratings of the Certificates are maintained, coverage under any  Mortgage
Pool Insurance Policy may be cancelled or reduced.
 
    The  original amount  of coverage under  any Mortgage  Pool Insurance Policy
will be reduced over the life of the Certificates by the aggregate dollar amount
of claims paid, less certain amounts realized by the insurer upon disposition of
foreclosed properties.  The  amount of  claims  paid includes  certain  expenses
incurred  by the  Master Servicer,  or the  Servicer with  respect to  Series of
Certificates for which the Company will not  act as Master Servicer, as well  as
accrued  interest on  delinquent Mortgage  Loans to the  date of  payment of the
claim. Accordingly,  if  aggregate  net  claims paid  under  any  Mortgage  Pool
Insurance Policy reach the original policy limit, coverage thereunder will lapse
and any further losses will be borne by Certificateholders. In addition, in such
event, the Master Servicer or the Servicer, as applicable, will not be obligated
(unless  sufficient  recoveries from  other sources  are  expected) to  make any
further Advances, since such Advances would no longer be ultimately  recoverable
under    the   Mortgage    Pool   Insurance   Policy.    See   "Description   of
Certificates--Advances".
 
                                       45
<PAGE>
    Since the property subject to a defaulted Mortgage Loan must be restored  to
its  original condition prior to claiming  against the insurer, no Mortgage Pool
Insurance Policy will provide coverage against hazard losses. As set forth under
"Primary  Insurance,  FHA  Mortgage  Insurance,  VA  Mortgage  Guaranty,  Hazard
Insurance;  Claims  Thereunder",  the  hazard  insurance  policies  covering the
Mortgage Loans typically exclude from coverage physical damage resulting from  a
number  of causes, and  even when the  damage is covered,  may afford recoveries
which are significantly less than the full replacement of such losses.  Further,
any  Special Hazard Insurance  Policy which may  be obtained does  not cover all
risks, and  such coverage  will  be limited  in  amount. See  "--Special  Hazard
Insurance"  below. Certain hazard risks will,  as a result, be uninsured against
and will therefore be borne by Certificateholders.
 
    A Mortgage  Pool Insurance  Policy may  include a  provision permitting  the
insurer to purchase defaulted Mortgage Loans from the Trust.
 
    See  "--The Fraud  Bond" below  for a discussion  of the  possible effect of
fraudulent conduct  or  negligence  by  the  Seller,  the  Seller/Servicer,  the
Servicer  or the Mortgagor with respect to a  Mortgage Loan on the coverage of a
Mortgage Pool Insurance Policy.
 
SUBORDINATION
 
    If so specified in the applicable Prospectus Supplement, distributions  with
respect   to  scheduled  principal,  Principal   Prepayments,  interest  or  any
combination thereof  that otherwise  would  have been  payable  to one  or  more
Classes  of  Certificates of  a  Series (the  "Subordinated  Certificates") will
instead be payable to holders of one  or more other Classes of such Series  (the
"Senior  Certificates") under the  circumstances and to  the extent specified in
the Prospectus Supplement. If specified in the applicable Prospectus Supplement,
delays in receipt  of scheduled  payments on the  Mortgage Loans  and losses  on
defaulted  Mortgage  Loans  will  be  borne  first  by  the  various  Classes of
Subordinated Certificates  and  thereafter  by the  various  Classes  of  Senior
Certificates,   in  each  case  under  the  circumstances  and  subject  to  the
limitations specified in the Prospectus Supplement. The aggregate  distributions
in  respect of delinquent payments  on the Mortgage Loans  over the lives of the
Certificates or  at any  time,  the aggregate  losses  in respect  of  defaulted
Mortgage Loans which must be borne by the Subordinated Certificates by virtue of
subordination and the amount of the distributions otherwise distributable to the
Subordinated   Certificateholders   that   will  be   distributable   to  Senior
Certificateholders on any Distribution Date may  be limited as specified in  the
applicable  Prospectus Supplement. If the aggregate distribution with respect to
delinquent payments on the Mortgage Loans or aggregate losses in respect of such
Mortgage Loans  were to  exceed  the total  amounts  payable and  available  for
distribution  to holders of Subordinated Certificates or, if applicable, were to
exceed the  specified  maximum  amount, holders  of  Senior  Certificates  could
experience losses on the Certificates.
 
    In  addition  to  or  in lieu  of  the  foregoing, if  so  specified  in the
applicable Prospectus Supplement, all or any portion of distributions  otherwise
payable  to holders  of Subordinated Certificates  on any  Distribution Date may
instead be deposited into one or  more reserve accounts (the "Reserve  Account")
established  by  the  Trustee.  If so  specified  in  the  applicable Prospectus
Supplement, such  deposits  may be  made  on  each Distribution  Date,  on  each
Distribution  Date for  specified periods  or until  the balance  in the Reserve
Account has reached a specified amount and, following payments from the  Reserve
Account to holders of Senior Certificates or otherwise, thereafter to the extent
necessary  to restore the balance in the  Reserve Account to required levels, in
each case as  specified in  the Prospectus Supplement.  If so  specified in  the
applicable  Prospectus Supplement, amounts on deposit in the Reserve Account may
be released to the Company,  the Servicer or the  Seller, as applicable, or  the
holders  of any Class of  Certificates at the times  and under the circumstances
specified in the Prospectus Supplement.
 
    If specified in  the applicable  Prospectus Supplement,  various Classes  of
Senior  Certificates and Subordinated Certificates may themselves be subordinate
in their right to receive certain  distributions to other Classes of Senior  and
Subordinated  Certificates, respectively,  through a cross  support mechanism or
otherwise.
 
                                       46
<PAGE>
    As  between  Classes  of  Senior  Certificates  and  as  between  Classes of
Subordinated Certificates, distributions may be allocated among such classes (i)
in the order  of their scheduled  final distribution dates,  (ii) in  accordance
with  a schedule or formula,  (iii) in relation to  the occurrence of events, or
(iv)  otherwise,  in  each  case  as  specified  in  the  applicable  Prospectus
Supplement. As between Classes of Subordinated Certificates, payments to holders
of Senior Certificates on account of delinquencies or losses and payments to any
Reserve Account will be allocated as specified in the Prospectus Supplement.
 
THE FRAUD BOND
 
    Some or all of the Primary Insurance Policies covering Mortgage Loans in any
Mortgage  Pool  may contain  an  exclusion from  coverage  for Fraud  Losses. To
provide limited protection  to Certificateholders  against losses  in the  event
that  coverage  relating to  a  Mortgage Loan  which  otherwise would  have been
available under a Primary Insurance Policy is not ultimately available by reason
of such an exclusion, if so specified in the applicable Prospectus Supplement, a
Fraud Instrument may be obtained or established by the Company or the  Servicer,
as  applicable, for the Mortgage Pool. The type, coverage amount and term of any
such Fraud Instrument will be disclosed in the applicable Prospectus  Supplement
or  in the related  Current Report on Form  8-K, and the  coverage amount may be
cancelled or reduced  during the life  of the Mortgage  Pool, provided that  the
then current ratings of the Certificates will not be adversely affected thereby.
The  Company or the Servicer, as applicable,  may also replace the initial Fraud
Instrument with  any other  type of  Fraud Instrument,  provided that  the  then
current  ratings of the Certificates will not be adversely affected thereby. The
identity of the issuer of any Fraud Bond or the Letter of Credit providing  such
coverage  and certain financial information with  respect to such issuer will be
contained in the applicable Prospectus  Supplement or related Current Report  on
Form 8-K.
 
    In  addition, the Company understands  that, regardless of whether exclusion
language such as that described above is included in the insurance documents, it
is the  policy of  some or  all issuers  of Primary  Insurance Policies  and  of
Mortgage  Pool Insurance  Policies to  deny coverage  in circumstances involving
fraudulent conduct or negligence by either the Seller, the Seller/Servicer,  the
Servicer or the Mortgagor. It is unclear whether any such denial would be upheld
by  a court. Neither  the repurchase obligation  of the Company  with respect to
Series of Certificates as to which the  Company will act as Master Servicer,  or
the  Seller with respect to Series of  Certificates as to which the Company will
not act as  Master Servicer, nor  any of the  Fraud Instruments described  above
would  apply to  any such  denial of coverage  unless, as  described above, such
denial is based  upon a  specific exclusion  relating to  fraudulent conduct  or
negligence which is included in a Primary Insurance Policy.
 
THE BANKRUPTCY BOND
 
    The  Prospectus Supplement  for certain Series  may specify  that the Master
Servicer with respect to Series of Certificates as to which the Company will act
as Master Servicer, or the Servicer with respect to Series of Certificates as to
which the Company will not act as Master Servicer, has undertaken to pay to  the
Trustee  for  the benefit  of Certificateholders  any  portion of  the principal
balance of a  Mortgage Loan  which becomes  unsecured pursuant  to a  proceeding
under  Chapter 7, 11 or 13 of the Federal Bankruptcy Code. If such obligation is
undertaken, the Master Servicer or the Servicer, as applicable, will also  agree
to  pay to the  Trustee for the  benefit of Certificateholders  any shortfall in
payment of principal and interest resulting from the recasting of any originally
scheduled monthly principal and interest payment pursuant to a ruling under  the
Bankruptcy  Code. These payment  obligations will be  subject to the limitations
specified in  the  applicable Pooling  Agreement.  The Master  Servicer  or  the
Servicer,  as applicable, will have the option, in lieu of making such payments,
to repurchase any Mortgage Loan affected by bankruptcy court rulings. To  insure
the  Master  Servicer's  or  the  Servicer's  obligation  to  make  the payments
described above, the Master Servicer or the Servicer, as applicable, will obtain
or establish  a Bankruptcy  Instrument in  an initial  amount specified  in  the
Prospectus  Supplement  or  in  the  related Current  Report  on  Form  8-K. The
Prospectus Supplement  or Current  Report on  Form 8-K  may also  specify  that,
provided  that  the then  current ratings  of  the Certificates  are maintained,
coverage under any Bankruptcy Instrument may be cancelled or reduced. The Master
Servicer with respect to Series of Certificates as to which the Company will act
as Master Servicer, or the Servicer with respect to Series of Certificates as to
which
 
                                       47
<PAGE>
the Company will not act as Master Servicer, may also replace the initial method
pursuant to  which  such coverage  is  provided with  either  of the  other  two
alternative  methods, provided that the then current ratings of the Certificates
will not be adversely affected thereby.
 
SPECIAL HAZARD INSURANCE
 
    A Special Hazard Insurance Instrument may be established or obtained by  the
Company  or the Servicer, as applicable,  for certain Series. Any Special Hazard
Insurance Instrument will, subject to  limitations described below, protect  the
holders  of  the Certificates  evidencing such  Mortgage Pool  from (i)  loss by
reason of  damage to  properties  subject to  defaulted Mortgage  Loans  covered
thereby  caused  by certain  hazards (including  earthquakes in  some geographic
areas, mud flows and floods) not insured against under customary standard  forms
of  fire and hazard insurance policies with  extended coverage, and (ii) loss on
such loans  caused by  reason  of the  application  of the  co-insurance  clause
typically  contained  in hazard  insurance  policies. The  Master  Servicer with
respect to Series of  Certificates as to  which the Company  will act as  Master
Servicer, or the Servicer with respect to Series of Certificates as to which the
Company  will not act  as Master Servicer,  may also replace  the initial method
pursuant to  which  such coverage  is  provided with  either  of the  other  two
alternative  methods, provided that the then current ratings of the Certificates
will not be  adversely affected  thereby. The Prospectus  Supplement or  Current
Report  on Form 8-K may also specify  that, provided the then current ratings of
the Certificates are  maintained, coverage under  any Special Hazard  Instrument
may  be cancelled or reduced. Any Special Hazard Insurance Policy will be issued
by an insurance company licensed to  transact a property and casualty  insurance
business  in  each  state  in which  Mortgaged  Properties  covered  thereby are
located. The identity of  the issuer of any  Special Hazard Insurance Policy  or
the  Letter of Credit providing such  coverage and certain financial information
with respect  to  such  issuer  will be  contained  in  the  related  Prospectus
Supplement.  No  Special Hazard  Insurance  Instrument will  cover Extraordinary
Losses.
 
    Subject to  the  foregoing limitations,  the  terms of  any  Special  Hazard
Insurance Instrument will provide generally that, where there has been damage to
property  securing a defaulted Mortgage Loan covered by such instrument and such
damage is  not fully  covered by  the hazard  insurance policy  maintained  with
respect  to  such property,  the Special  Hazard  Insurance Instrument  will pay
either (i) the  cost of repair  of such  property or (ii)  the unpaid  principal
balance  of such Mortgage Loan at the time of an approved sale of such property,
plus accrued  interest  at the  Mortgage  Interest Rate  to  the date  of  claim
settlement  and certain expenses incurred in  respect of such property, less any
net proceeds upon the  sale of such  property. In either  case, the amount  paid
under  any Special Hazard Insurance Instrument  will be reduced by the proceeds,
if any, received under  the hazard insurance policy  maintained with respect  to
such  property. It  is expected  that the  Mortgage Pool  Insurer, if  any, will
represent  to  the  Master  Servicer  or  the  Servicer,  as  applicable,   that
restoration of the property securing a Mortgage Loan from the proceeds described
under  (i)  above will  satisfy the  condition under  any related  Mortgage Pool
Insurance Policy  that  the  property  securing a  defaulted  Mortgage  Loan  be
restored  before  a claim  under any  such  policy may  be validly  presented in
respect of  such Mortgage  Loan. The  payment described  under (ii)  above  will
render  unnecessary presentation  of a  claim in  respect of  such Mortgage Loan
under any Mortgage  Pool Insurance Policy.  Therefore, so long  as any  Mortgage
Pool  Insurance  Policy for  a  Series of  Certificates  remains in  effect, the
decision to pay  the cost  of repair  rather than  to pay  the unpaid  principal
balance  of  the  related  Mortgage  Loan,  plus  accrued  interest  and certain
expenses, will not affect the amount of the total insurance proceeds paid to the
holders of the Certificates of that  Series with respect to such Mortgage  Loan,
but  will affect the amount of special hazard insurance coverage remaining under
any Special Hazard  Insurance Instrument  and the coverage  remaining under  any
Mortgage Pool Insurance Policy obtained for that Series.
 
LETTER OF CREDIT
 
    If  any component of credit enhancement as  to any Series of Certificates is
to be provided by a letter of credit  (the "Letter of Credit"), a bank or  other
entity  (the "Letter of Credit Bank") will deliver to the Trustee an irrevocable
Letter of Credit. The Letter of Credit Bank and certain information with respect
thereto, as  well  as the  amount  available under  the  Letter of  Credit  with
 
                                       48
<PAGE>
respect  to  each component  of  credit enhancement,  will  be specified  in the
applicable Prospectus  Supplement.  The Letter  of  Credit will  expire  on  the
expiration  date set forth in the  related Prospectus Supplement, unless earlier
terminated or extended in accordance with its terms.
 
    The Letter of Credit may also provide for the payment of Advances which  the
Master  Servicer with respect to Series of  Certificates as to which the Company
will act  as  Master  Servicer,  or  the Servicer  with  respect  to  Series  of
Certificates  as to which the Company will  not act as Master Servicer, would be
obligated to make with respect to delinquent monthly payments.
 
RESERVE FUND
 
    If so  specified in  the  related Prospectus  Supplement, the  Company,  the
Servicer  or the Seller, as applicable, will deposit or cause to be deposited in
a Reserve Fund cash or Eligible  Investments in specified amounts, or any  other
instruments   satisfactory  to  the   rating  agency  or   agencies  rating  the
Certificates offered  pursuant  to such  Prospectus  Supplement, which  will  be
applied  and maintained in the manner and under the conditions specified in such
Prospectus Supplement. In the alternative or in addition to such deposit, to the
extent described in  the related Prospectus  Supplement, a Reserve  Fund may  be
funded  through application of all or a  portion of amounts otherwise payable on
one or more related Classes of Certificates, from Retained Yield, or  otherwise.
Amounts  in a  Reserve Fund  may be used  to provide  one or  more components of
credit enhancement, or applied to reimburse the Master Servicer with respect  to
Series  of Certificates as to which the  Company will act as Master Servicer, or
the Servicer with respect to Series of Certificates as to which the Company will
not act as Master Servicer, for outstanding  Advances, or may be used for  other
purposes,  in the manner and  to the extent specified  in the related Prospectus
Supplement. Unless otherwise provided in the related Prospectus Supplement,  any
such Reserve Fund will not be deemed to be part of the related Trust Fund.
 
    Amounts  deposited in any Reserve Fund for  a Series of Certificates will be
invested in Eligible Investments by, or at the direction of, and for the benefit
of the Master Servicer or the  Certificate Administrator, as applicable, or  any
other  person  named  in  the related  Prospectus  Supplement.  Unless otherwise
specified in the applicable Prospectus Supplement, any amounts remaining in  the
Reserve Fund upon the termination of the Trust Fund will be returned to whomever
deposited such amounts in the Reserve Fund.
 
CERTIFICATE INSURANCE POLICIES
 
    If  so specified  in the related  Prospectus Supplement, the  Company or the
Servicer may  obtain  one or  more  certificate insurance  policies,  issued  by
insurers  acceptable to  the rating agency  or agencies  rating the Certificates
offered pursuant to such Prospectus Supplement,  insuring the holders of one  or
more  Classes of Certificates the payment of  amounts due in accordance with the
terms of such Class or Classes of Certificates, subject to such limitations  and
exceptions as are set forth in the applicable Prospectus Supplement.
 
MAINTENANCE OF CREDIT ENHANCEMENTS; CLAIMS THEREUNDER
    AND OTHER REALIZATION UPON DEFAULTED MORTGAGE LOANS
 
    For  each Series of  Certificates which will  be covered by  a Mortgage Pool
Insurance Policy, or a Letter of Credit established in lieu of such policy (such
coverage to be disclosed  in the applicable  Prospectus Supplement), the  Master
Servicer with respect to Series of Certificates as to which the Company will act
as Master Servicer, or the Servicer with respect to Series of Certificates as to
which  the  Company will  not act  as  Master Servicer,  will exercise  its best
reasonable efforts to  keep such  Mortgage Pool  Insurance Policy  or Letter  of
Credit  in full force and  effect throughout the term  of the Pooling Agreement,
unless coverage thereunder has been exhausted  through the payment of claims  or
until  such instrument is replaced  in accordance with the  terms of the Pooling
Agreement. Unless otherwise specified  in the applicable Prospectus  Supplement,
the  Master  Servicer or  the Servicer,  as  applicable, will  agree to  pay the
premiums for any Mortgage Pool Insurance Policy,  and the fee for any Letter  of
Credit, on a timely basis. In the event that the insurer under the Mortgage Pool
Insurance  Policy ceases to  be a Qualified  Insurer (as defined  in the Pooling
Agreement), or the Letter of Credit Bank  ceases to be acceptable to the  agency
or  agencies, if any, rating the Series, the Master Servicer or the Servicer, as
applicable, will  use  its  best  reasonable  efforts  to  obtain  from  another
Qualified Insurer
 
                                       49
<PAGE>
or  letter of credit issuer a replacement  policy or letter of credit comparable
to the Mortgage  Pool Insurance Policy  or Letter of  Credit which it  replaces,
with  total coverage equal to the then outstanding coverage of the Mortgage Pool
Insurance Policy  or  Letter  of  Credit,  provided that  if  the  cost  of  the
replacement  policy or letter of credit is greater than the cost of the Mortgage
Pool Insurance Policy or  Letter of Credit being  replaced, the coverage of  the
replacement  policy or  letter of  credit for  a Series  of Certificates  may be
reduced to a level such  that its premium rate or  cost does not exceed 150%  of
the  premium rate  or cost of  the Mortgage  Pool Insurance Policy  or Letter of
Credit for a Series which  is rated by one or  more rating agencies, or 100%  of
the  premium rate or cost for such policy or letter of credit for a Series which
is not so rated.
 
    In addition,  the  Master  Servicer  or the  Servicer,  as  applicable,  may
substitute  at any time a Mortgage Pool Insurance Policy or Letter of Credit for
an existing Mortgage  Pool Insurance Policy  or Letter of  Credit. In no  event,
however,  may  the Master  Servicer or  the Servicer,  as applicable,  provide a
Letter of Credit in lieu of a Mortgage Pool Insurance Policy, or vice-versa,  or
substitute  one  such instrument  for  another, except  under  the circumstances
detailed in the preceding paragraph, if such action will impair the then current
ratings, if any, of the Certificates.
 
    Unless otherwise  specified in  the applicable  Prospectus Supplement,  each
Seller/Servicer  with respect to Series of  Certificates as to which the Company
will act  as  Master  Servicer,  or  the Servicer  with  respect  to  Series  of
Certificates as to which the Company will not act as Master Servicer, will cause
a  Primary  Insurance Policy  to be  maintained  in full  force and  effect with
respect to each Mortgage Loan it  services with a loan-to-value ratio in  excess
of  80%; provided, however, that  if the loan-to-value ratio  of a Mortgage Loan
based on a subsequent appraisal of the Mortgaged Property is less than 80%, such
Primary Insurance Policy may  be terminated, if so  specified in the  applicable
Prospectus Supplement. Each Seller/Servicer or the Servicer, as applicable, will
agree  to pay the premium for each Primary Insurance Policy on a timely basis in
the event  that  the  Mortgagor  does  not  make  such  payments.  See  "Primary
Insurance,  FHA  Mortgage  Insurance, VA  Mortgage  Guaranty,  Hazard Insurance;
Claims Thereunder--Primary Insurance" herein.
 
    For each Series of  Certificates which will be  covered by a Special  Hazard
Insurance Instrument (such coverage to be disclosed in the applicable Prospectus
Supplement),  the Master Servicer  with respect to Series  of Certificates as to
which the Company will act as Master  Servicer, or the Servicer with respect  to
Series  of Certificates as to which the Company will not act as Master Servicer,
will exercise its best reasonable efforts to keep such Special Hazard  Insurance
Instrument  in  full  force  and  effect  throughout  the  term  of  the Pooling
Agreement, unless coverage thereunder has been exhausted through the payment  of
claims  or until such  Special Hazard Insurance Instrument  has been replaced in
accordance with the terms  of the Pooling Agreement.  So long as any  applicable
rating  on a Series of  Certificates will be maintained,  the Master Servicer or
the Servicer, as  applicable, may  at any  time replace  the initial  instrument
providing  special  hazard coverage  with either  of  the other  two alternative
methods. Unless otherwise specified in the applicable Prospectus Supplement, the
Master Servicer or the  Servicer, as applicable, will  agree to pay the  premium
for  any Special Hazard Insurance  Policy (or Letter of  Credit obtained in lieu
thereof) on  a  timely  basis.  Unless otherwise  specified  in  the  applicable
Prospectus  Supplement, any such policy will provide for a fixed premium rate on
the declining  balance of  the Mortgage  Loans. In  the event  that any  Special
Hazard Insurance Policy is cancelled or terminated for any reason other than the
exhaustion  of total  policy coverage, the  Master Servicer or  the Servicer, as
applicable, is obligated either to substitute a Letter of Credit or Reserve Fund
or to exercise  its best  reasonable efforts to  obtain from  another insurer  a
replacement  policy comparable  to such Special  Hazard Insurance  Policy with a
total coverage which  is equal  to the then  existing coverage  of such  Special
Hazard  Insurance  Policy;  provided, however,  that  if  the cost  of  any such
replacement policy shall be greater than the cost of the original Special Hazard
Insurance Policy,  the amount  of coverage  of such  replacement policy  may  be
reduced to a level such that the cost shall be equal to the cost of the original
Special  Hazard Insurance  Policy. As  indicated above,  in lieu  of obtaining a
replacement  Special  Hazard  Insurance  Policy,  the  Master  Servicer  or  the
Servicer,  as applicable, may obtain  a Letter of Credit  or establish a Reserve
Fund in accordance with terms prescribed by any applicable rating agency so that
any rating obtained for the Certificates will not be impaired.
 
                                       50
<PAGE>
    For each Series of Certificates which will be covered by a Fraud  Instrument
(such  coverage to  be disclosed in  the applicable  Prospectus Supplement), the
Master Servicer with respect to Series  of Certificates as to which the  Company
will  act  as  Master  Servicer,  or the  Servicer  with  respect  to  Series of
Certificates as  to which  the Company  will not  act as  Master Servicer,  will
exercise  its  best  reasonable efforts  to  maintain  and keep  any  such Fraud
Instrument in full force and effect throughout the required term as set forth in
the applicable  Prospectus  Supplement,  unless  coverage  thereunder  has  been
exhausted through the payment of claims. The Master Servicer or the Servicer, as
applicable,  will agree to pay the premium for any Fraud Bond or Bankruptcy Bond
on a timely basis.
 
    For each  Series of  Certificates or  Class of  Certificates which  will  be
covered  by a certificate insurance policy or a Letter of Credit or Reserve Fund
(such coverage to  be disclosed  in the applicable  Prospectus Supplement),  the
Master  Servicer with respect to Series of  Certificates as to which the Company
will act  as  Master  Servicer,  or  the Servicer  with  respect  to  Series  of
Certificates  as to  which the  Company will  not act  as Master  Servicer, will
exercise its best reasonable efforts to  maintain and keep any such  certificate
insurance  policy, Letter  of Credit  or Reserve Fund  in full  force and effect
throughout the required term set forth in the applicable Prospectus  Supplement.
Unless  otherwise specified in the Prospectus Supplement, the Master Servicer or
the Servicer, as applicable, will agree  to pay the premium for any  certificate
insurance policy on a timely basis.
 
    The  Master  Servicer or  the Seller/Servicers,  with  respect to  Series of
Certificates as  to  which the  Company  will act  as  Master Servicer,  or  the
Servicer with respect to Series of Certificates as to which the Company will not
act  as Master Servicer,  on behalf of the  Trustee and Certificateholders, will
present claims to  the issuer of  any applicable Primary  Insurance Policy,  FHA
Insurance  Policy, VA Guaranty,  Mortgage Pool Insurance  Policy, Special Hazard
Insurance Policy or Letter of Credit, or under any Reserve Fund or other form of
credit enhancement, and  will take  such reasonable  steps as  are necessary  to
permit   recovery  under  such  insurance   policies  or  alternative  coverages
respecting defaulted Mortgage Loans. With respect to any applicable Fraud  Bond,
Bankruptcy Bond or certificate insurance policy, the Trustee will present claims
to the issuer of such bond or policy on behalf of the Certificateholders. As set
forth  above, all collections by the  Master Servicer or the Seller/Servicer, or
the Servicer, as applicable, under  such policies or alternative coverages  that
are  not applied to the restoration of  the related Mortgaged Property are to be
deposited in the applicable Custodial Account for P&I, the Investment Account or
the Certificate Account, subject to withdrawal as heretofore described.
 
    If any property securing a defaulted Mortgage Loan is damaged and  proceeds,
if  any,  from the  related hazard  insurance policy  or any  applicable Special
Hazard Insurance Policy (or Letter of Credit  or Reserve Fund), as the case  may
be,  are insufficient to restore the  damaged property to a condition sufficient
to permit  recovery  under any  applicable  Mortgage Pool  Insurance  Policy  or
Primary  Insurance  Policy,  the  Master Servicer,  with  respect  to  Series of
Certificates as  to which  the Company  will  act as  Master Servsicer,  or  the
Servicer with respect to Series of Certificates as to which the Company will not
act  as Master Servicer, will not be required to expend its own funds to restore
the damaged  property  unless  it  determines (i)  that  such  restoration  will
increase  the proceeds  to Certificateholders  upon liquidation  of the Mortgage
Loan after reimbursement of the Master Servicer or the Servicer, as  applicable,
for  its expenses and (ii) that such  expenses will be recoverable to it through
Liquidation Proceeds or Insurance Proceeds.
 
    If recovery under any  Mortgage Pool Insurance Policy  (or Letter of  Credit
established  in lieu  of such policy),  Primary Insurance  Policy, FHA Insurance
Policy or VA Guaranty is not available because the Master Servicer, with respect
to Series of Certificates as to which  the Company will act as Master  Servicer,
or  the Servicer with respect to Series  of Certificates as to which the Company
will not act  as Master  Servicer, has been  unable to  make the  determinations
described  in the second preceding  paragraph, or otherwise, the Seller/Servicer
or the  Servicer, as  applicable,  is, nevertheless,  obligated to  follow  such
normal  practices and procedures  as it deems necessary  or advisable to realize
upon the defaulted  Mortgage Loan.  If the proceeds  of any  liquidation of  the
property  securing  the  defaulted Mortgage  Loan  are less  than  the principal
balance of the defaulted Mortgage Loan plus accrued and unpaid interest  thereon
at  the applicable Pass-Through Rate (after  deduction of the Retained Yield, if
any, or  a  pro rata  portion  thereof as  required  by the  applicable  Pooling
Agreement),  Certificateholders  in the  aggregate will  realize  a loss  in the
amount of such difference plus the aggregate of expenses
 
                                       51
<PAGE>
incurred by the  Master Servicer and  the Seller/Servicer, or  the Servicer,  as
applicable, in connection with such proceedings and which are reimbursable under
the  Pooling Agreement. In addition,  and as set forth  above, in the event that
the Master Servicer or the Servicer,  as applicable, has expended its own  funds
to  restore damaged property and  such funds have not  been reimbursed under any
Special Hazard Insurance Policy or Letter of Credit or Reserve Fund, it will  be
entitled  to receive  from the Certificate  Account, out  of related Liquidation
Proceeds or Insurance Proceeds, an amount equal to such expenses incurred by it,
in which event the  Certificateholders may realize  a loss up  to the amount  so
charged.  Since Insurance Proceeds  cannot exceed deficiency  claims and certain
expenses incurred  by  the Master  Servicer  and the  Seller/Servicers,  or  the
Servicer,  as applicable,  no insurance  payments will  result in  a recovery to
Certificateholders which exceeds the principal balance of the defaulted Mortgage
Loan together  with  accrued  and  unpaid interest  thereon  at  the  applicable
Pass-Through  Rate. In  addition, where  property securing  a defaulted Mortgage
Loan can be resold for an amount exceeding the principal balance of any  related
Mortgage  Note together with  accrued interest and expenses,  it may be expected
that, where retention  of any such  amount is legally  permissible, the  insurer
will  exercise its  right under  any related  Mortgage Pool  Insurance Policy to
purchase such property and realize for itself any excess proceeds. In  addition,
with respect to certain Series of Certificates, if so provided in the applicable
Prospectus  Supplement, the Master Servicer or  the Servicer, as applicable, may
have the option  to purchase  from the Trust  Fund any  defaulted Mortgage  Loan
after  a specified period of delinquency. If a defaulted Mortgage Loan is not so
removed from the Trust Fund, then, upon the final liquidation thereof, if a loss
is realized which is not covered by any applicable form of credit enhancement or
other insurance, the Certificateholders will bear such loss. However, if a  gain
results  from the final  liquidation of a  defaulted Mortgage Loan  which is not
required by law to be remitted to the related Mortgagor, the Master Servicer  or
the  Servicer, as applicable, will be entitled to retain such gain as additional
servicing compensation  unless  the applicable  Prospectus  Supplement  provides
otherwise. See "Description of Credit Enhancements".
 
                  CERTAIN LEGAL ASPECTS OF THE MORTGAGE LOANS
 
    The  Mortgages  (other  than the  security  agreements with  respect  to the
Cooperative Loans) will be  either deeds of trust  or mortgages, depending  upon
the prevailing practice in the state in which the Mortgaged Property is located.
A  mortgage creates a lien upon the real property encumbered by the mortgage. It
is not prior to the lien for real estate taxes and assessments. Priority between
mortgages depends on their  terms and generally  on the order  of filing with  a
state  or county office. There are two parties to a mortgage: the mortgagor, who
is usually the  borrower and homeowner,  and the mortgagee,  who is the  lender.
Under the mortgage instrument, the mortgagor delivers to the mortgagee a note or
bond and the mortgage. Although a deed of trust is similar to a mortgage, a deed
of  trust formally has three parties; the borrower-homeowner, called the trustor
(similar to  a  mortgagor), a  lender,  called  the beneficiary  (similar  to  a
mortgagee),  and  a third-party  grantee, called  the trustee.  Under a  deed of
trust, the trustor grants the property,  irrevocably until the debt is paid,  in
trust,  generally with a power of sale, to  the trustee to secure payment of the
obligation. In some cases,  a mortgage will  also contain a  power of sale.  The
trustee's  authority under a deed of trust and the mortgagee's authority under a
mortgage are governed by law, by the express provisions of the deed of trust  or
mortgage  and, in some cases, by the directions of the beneficiary. For purposes
of the  following discussion,  "mortgagor"  shall, as  appropriate, refer  to  a
mortgagor  or trustor and "lender" shall refer  to a mortgagee or beneficiary. A
Mortgage Pool may also contain Cooperative Loans which are described below under
"--Cooperative Loans".
 
COOPERATIVE LOANS
 
    If  specified  in  the  Prospectus  Supplement  relating  to  a  Series   of
Certificates,  the  Mortgage  Loans  may also  include  Cooperative  Loans. Each
promissory note (a  "Cooperative Note")  evidencing a Cooperative  Loan will  be
secured  by  a  security  interest  in  shares  issued  by  the  related private
cooperative  housing  corporation  (a  "Cooperative")  that  owns  the   related
apartment  building, which is a corporation entitled  to be treated as a housing
cooperative under  federal tax  law, and  in the  related proprietary  lease  or
occupancy agreement granting exclusive rights to occupy a specific dwelling unit
in the Cooperative's building. The security agreement will create a lien upon or
grant  a security  interest in the  cooperative shares and  proprietary lease or
occupancy agreement,  the priority  of which  will depend  on the  terms of  the
particular  security  agreement  as well  as  the  order of  recordation  of the
 
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<PAGE>
agreement (or the  filing of the  financing statements related  thereto) in  the
appropriate  recording office  or the  taking of  possession of  the cooperative
shares, depending on the law of the  state in which the cooperative is  located.
Such  a lien or security interest is not, in general, prior to liens in favor of
the Cooperative for unpaid assessments or common charges.
 
    Unless  otherwise  specified  in  the  related  Prospectus  Supplement,  all
cooperative  buildings  relating to  the Cooperative  Loans  are located  in the
States of New York and  New Jersey. Generally, each  Cooperative owns in fee  or
has  a leasehold interest in all the real property and owns in fee or leases the
building and all separate  dwelling units therein.  The Cooperative is  directly
responsible  for property management and, in  most cases, payment of real estate
taxes, other governmental  impositions and  hazard and  liability insurance.  If
there  is an underlying mortgage (or mortgages) on the Cooperative's building or
underlying land, as is generally the case,  or an underlying lease of the  land,
as  is the case in  some instances, the Cooperative,  as mortgagor or lessee, as
the case may  be, is  also responsible for  fulfilling such  mortgage or  rental
obligations.   An  underlying  mortgage  loan  is  ordinarily  obtained  by  the
Cooperative in  connection  with either  the  construction or  purchase  of  the
Cooperative's  building  or the  obtaining of  capital  by the  Cooperative. The
interest of the occupant under proprietary leases or occupancy agreements as  to
which that Cooperative is the landlord are generally subordinate to the interest
of  the holder of an underlying mortgage and  to the interest of the holder of a
land lease. If  the Cooperative is  unable to meet  the payment obligations  (i)
arising  under  an  underlying  mortgage, the  mortgagee  holding  an underlying
mortgage  could  foreclose  on  that  mortgage  and  terminate  all  subordinate
proprietary  leases  and occupancy  agreements or  (ii)  arising under  its land
lease, the  holder  of  the  landlord's interest  under  the  land  lease  could
terminate it and all subordinate proprietary leases and occupancy agreements. In
addition,  an underlying mortgage on a  Cooperative may provide financing in the
form of a mortgage that does not  fully amortize, with a significant portion  of
principal  being due  in one  final payment  at maturity.  The inability  of the
Cooperative to refinance a  mortgage and its consequent  inability to make  such
final  payment could  lead to  foreclosure by  the mortgagee.  Similarly, a land
lease has an expiration date and the inability of the Cooperative to extend  its
term  or, in the alternative, to purchase the land, could lead to termination of
the Cooperative's interest in  the property and  termination of all  proprietary
leases and occupancy agreements. In either event, a foreclosure by the holder of
an  underlying  mortgage  or  the  termination  of  the  underlying  lease could
eliminate or significantly  diminish the  value of  any collateral  held by  the
lender  who financed the purchase by  an individual tenant-stockholder of shares
of the Cooperative or, in the case  of a Mortgage Pool, the collateral  securing
any related Cooperative Loans.
 
    Each    Cooperative   is    owned   by   shareholders    (referred   to   as
tenant-stockholders)  who,  through  ownership  of   stock  or  shares  in   the
Cooperative,  receive proprietary  leases or  occupancy agreements  which confer
exclusive rights to occupy  specific dwellings. Generally, a  tenant-stockholder
of  a Cooperative  must make  a monthly  maintenance payment  to the Cooperative
pursuant to the  proprietary lease,  which maintenance  payment represents  such
tenant-stockholder's  PRO  RATA  share  of the  Cooperative's  payments  for its
underlying mortgage, real property taxes, maintenance expenses and other capital
or ordinary expenses. An  ownership interest in  a Cooperative and  accompanying
occupancy  rights  may be  financed through  a Cooperative  Loan evidenced  by a
Cooperative Note and secured by an assignment of and a security interest in  the
occupancy  agreement or proprietary lease and  a security interest in the shares
of the related Cooperative. The lender  generally takes possession of the  share
certificate  and a counterpart  of the proprietary  lease or occupancy agreement
and a financing statement covering the proprietary lease or occupancy  agreement
and  the Cooperative shares is filed in  the appropriate state and local offices
to perfect the lender's interest in  its collateral. Subject to the  limitations
discussed  below, upon default of the tenant-stockholder, the lender may sue for
judgment on  the Cooperative  Note, dispose  of the  collateral at  a public  or
private  sale or otherwise proceed  against the collateral or tenant-stockholder
as an individual as provided in  the security agreement covering the  assignment
of  the proprietary lease  or occupancy agreement and  the pledge of Cooperative
shares. See "-- Foreclosure on Shares of Cooperatives" below.
 
TAX ASPECTS OF COOPERATIVE OWNERSHIP
 
    In general, a "tenant-stockholder" (as  defined in Section 216(b)(2) of  the
Code)  of a  corporation that qualifies  as a  "cooperative housing corporation"
within the meaning of Section 216(b)(1) of the
 
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<PAGE>
Code is allowed a deduction under Section 216(a) of the Code for amounts paid or
accrued within his or  her taxable year to  the corporation representing his  or
her  proportionate share  of certain interest  expenses and  certain real estate
taxes allowable as deductions to the  corporation under Sections 163 and 164  of
the  Code. In order for a corporation  to qualify under Section 216(b)(1) of the
Code for the taxable year to which such interest and tax deductions relate, such
section requires, among other things, that at  least 80% of the gross income  of
the  corporation  be derived  from its  tenant-stockholders.  By virtue  of this
requirement, the status of  a corporation for purposes  of Section 216(b)(1)  of
the  Code must be determined on a year-to-year basis. Consequently, there can be
no assurance that Cooperatives  relating to the  Cooperative Loans will  qualify
under such section for any particular year. In the event that such a Cooperative
fails to qualify for one or more years, the value of the collateral securing any
related  Cooperative Loans could be  significantly impaired because no deduction
would be allowable to tenant-stockholders under Section 216(a) of the Code  with
respect to those years. In view of the significance of the tax benefits accorded
tenant-stockholders  of a corporation that  qualifies under Section 216(b)(1) of
the Code, the likelihood that such a failure would be permitted to continue over
a period of years appears remote.
 
FORECLOSURE
 
    Foreclosure may be accomplished by judicial action. The action is  initiated
by  the service of  legal pleadings upon  all parties having  an interest in the
real property. Delays in completion  of the foreclosure may occasionally  result
from  difficulties in locating necessary parties defendant. Judicial foreclosure
proceedings are  generally  not  contested  by any  of  the  parties  defendant.
However,   when  the  lender's  right  to  foreclose  is  contested,  the  legal
proceedings necessary to  resolve the  issue can  be time  consuming. After  the
completion  of  judicial  foreclosure,  the  court  would  issue  a  judgment of
foreclosure and would  generally appoint  a referee  or other  court officer  to
conduct the sale of property.
 
    In  many states,  foreclosure of  a mortgage  or deed  of trust  may also be
accomplished by a nonjudicial sale under a specific provision in the mortgage or
deed of trust which authorizes the sale  of the property at public auction  upon
default  by  the mortgagor.  The laws  of the  various states  establish certain
notice requirements for non-judicial foreclosure  sales. In some states,  notice
of  default must be recorded and sent to the mortgagor and to any person who has
recorded a request  for a copy  of a notice  of default and  notice of sale.  In
addition,  notice  must be  provided  in some  states  to certain  other persons
including junior lienholders and any other individual having an interest in  the
real  property. In  some states,  the mortgagor,  or any  other person  having a
junior encumbrance on the real estate, may, during a reinstatement period,  cure
the  default by paying the entire amount in arrears, plus the costs and expenses
incurred in enforcing the obligation.  Generally, state law controls the  amount
of  foreclosure expenses and costs, including limited attorneys' fees, which may
be recovered by a lender. Some states also require a notice of sale to be posted
in a public place and  published for a specified period  of time in one or  more
newspapers.  In addition, some state  laws require that a  copy of the notice of
sale be posted on the property and sent to all parties having an interest in the
real property.
 
    In case of foreclosure under either a mortgage or a deed of trust, the  sale
by  the receiver or other designated officer or by the trustee is a public sale.
However, because of a  number of factors, including  the difficulty a  potential
buyer  at the sale would  have in determining the exact  status of title and the
fact that the physical  condition of the property  may have deteriorated  during
the  foreclosure proceedings, it is  uncommon for a third  party to purchase the
property at  the  foreclosure sale.  Rather,  it is  common  for the  lender  to
purchase the property from the trustee or referee with a credit bid in an amount
equal  to the  principal amount of  the mortgage  or deed of  trust, accrued and
unpaid interest and  the expenses  of foreclosure. Thereafter,  the lender  will
assume  the  burdens of  ownership, including  obtaining casualty  insurance and
making such repairs at its own expense  as are necessary to render the  property
suitable for sale. The lender will commonly obtain the services of a real estate
broker  and  pay the  broker's commission  in  connection with  the sale  of the
property. Depending upon market conditions, the ultimate proceeds of the sale of
the property may not equal the lender's investment in the property.
 
    Courts  have   imposed  general   equitable  principles   upon   foreclosure
proceedings.  These equitable principles  are generally designed  to relieve the
mortgagor from  the legal  effect  of his  defaults  under the  loan  documents.
Examples  of  judicial  remedies  that  have  been  fashioned  include  judicial
requirements that  the  lender  undertake affirmative  and  sometimes  expensive
actions to determine
 
                                       54
<PAGE>
the  causes for  the mortgagor's default  and the likelihood  that the mortgagor
will be able to reinstate the loan. In some cases, courts have substituted their
judgment for  the lender's  judgment and  have required  that lenders  reinstate
loans  or recast  payment schedules in  order to accommodate  mortgagors who are
suffering from a  temporary financial  disability. In other  cases, courts  have
limited  the right of the lender to  foreclose if the default under the security
instrument is not monetary, such as the mortgagor failing to adequately maintain
or insure the property or the mortgagor  executing a second mortgage or deed  of
trust  affecting the  property. Some  courts have been  faced with  the issue of
whether or not federal or state constitutional provisions reflecting due process
concerns for adequate notice require that mortgagors receive notices in addition
to the  statutorily prescribed  minimum. For  the most  part, these  cases  have
upheld  the  notice  provisions  as  being reasonable  or  have  found  that the
foreclosure  sale  does   not  involve   sufficient  state   action  to   afford
constitutional protections to the mortgagor.
 
FORECLOSURE ON SHARES OF COOPERATIVES
 
    The  Cooperative shares owned  by the tenant-stockholder,  together with the
rights of  the  tenant-stockholder  under the  proprietary  lease  or  occupancy
agreement,  are pledged to the  lender and are, in  almost all cases, subject to
restrictions on  transfer  as set  forth  in the  Cooperative's  certificate  of
incorporation  and by-laws,  as well  as in  the proprietary  lease or occupancy
agreement. The proprietary lease or occupancy agreement, even while pledged, may
be cancelled by  the Cooperative for  failure by the  tenant-stockholder to  pay
maintenance  or other  obligations or  charges owed  by such tenant-stockholder,
including mechanics' liens against the  Cooperative's building incurred by  such
tenant-stockholder.  Generally,  maintenance and  other obligations  and charges
arising under a proprietary lease or  occupancy agreement which are owed to  the
Cooperative  are made liens  upon the shares  to which the  proprietary lease or
occupancy agreement relates.  In addition,  the proprietary  lease or  occupancy
agreement generally permits the Cooperative to terminate such lease or agreement
in  the event the borrower defaults  in the performance of covenants thereunder.
Typically, the lender  and the  Cooperative enter into  a recognition  agreement
which,   together  with  any  lender  protection  provisions  contained  in  the
proprietary lease, establishes the rights and obligations of both parties in the
event of  a default  by  the tenant-stockholder  on  its obligations  under  the
proprietary  lease or occupancy  agreement. A default  by the tenant-stockholder
under the proprietary  lease or  occupancy agreement will  usually constitute  a
default   under   the   security   agreement   between   the   lender   and  the
tenant-stockholder.
 
    The recognition agreement  generally provides  that, in the  event that  the
tenant-stockholder  has  defaulted  under  the  proprietary  lease  or occupancy
agreement, the  Cooperative will  take  no action  to  terminate such  lease  or
agreement  until the lender has been provided  with notice of and an opportunity
to cure the default.  The recognition agreement typically  provides that if  the
proprietary  lease or  occupancy agreement  is terminated,  the Cooperative will
recognize the lender's lien against proceeds from  a sale of the shares and  the
proprietary  lease or  occupancy agreement  allocated to  the dwelling, subject,
however, to the Cooperative's right to sums due under such proprietary lease  or
occupancy  agreement or which  have become liens  on the shares  relating to the
proprietary  lease  or  occupancy  agreement.  The  total  amount  owed  to  the
Cooperative  by  the  tenant-stockholder,  which  the  lender  generally  cannot
restrict and does not monitor, could reduce  the amount realized upon a sale  of
the  collateral below the outstanding principal  balance of the Cooperative Loan
and accrued and unpaid interest thereon.
 
    Recognition agreements also generally provide  that in the event the  lender
succeeds  to the tenant-stockholder's shares  and proprietary lease or occupancy
agreement as the result of realizing upon its collateral for a Cooperative Loan,
the lender must obtain the approval or consent of the board of directors of  the
Cooperative  as  required  by  the  proprietary  lease  before  transferring the
Cooperative shares and assigning the proprietary lease. Such approval or consent
is usually based  on the  prospective purchaser's  income and  net worth,  among
other  factors, and may significantly reduce the number of potential purchasers,
which could limit the ability of the  lender to sell and realize upon the  value
of  the collateral. Generally,  the lender is  not limited in  any rights it may
have to dispossess the tenant-stockholder.
 
                                       55
<PAGE>
    Because of  the nature  of Cooperative  Loans, lenders  do not  require  the
tenant-stockholder  (i.e., the borrower) to obtain  title insurance of any type.
Consequently, the existence of any prior  liens or other imperfections of  title
affecting  the Cooperative's building  or real estate  also may adversely affect
the marketability of the shares allocated to  the dwelling unit in the event  of
foreclosure.
 
    A  foreclosure on the  Cooperative shares is accomplished  by public sale in
accordance with the provisions of Article 9 of the Uniform Commercial Code  (the
"UCC") and the security agreement relating to those shares. Article 9 of the UCC
requires that a sale be conducted in a "commercially reasonable" manner. Whether
a  sale has been conducted in a  "commercially reasonable" manner will depend on
the facts in each case. In  determining commercial reasonableness, a court  will
look  to the  notice given the  debtor and  the method, manner,  time, place and
terms of the sale and the sale  price. Generally, a sale conducted according  to
the  usual practice of  creditors selling similar  collateral will be considered
reasonably conducted.
 
    Article 9 of the UCC provides that the proceeds of the sale will be  applied
first  to  pay the  costs  and expenses  of  the sale  and  then to  satisfy the
indebtedness  secured  by  the  lender's  security  interest.  The   recognition
agreement,  however, generally provides that the lender's right to reimbursement
is subject to the right of the Cooperative corporation to receive sums due under
the proprietary lease or occupancy  agreement. If there are proceeds  remaining,
the  lender must account to the  tenant-stockholder for the surplus. Conversely,
if a  portion of  the  indebtedness remains  unpaid, the  tenant-stockholder  is
generally responsible for the deficiency. See "--Anti-Deficiency Legislation and
Other Limitations on Lenders" below.
 
RIGHTS OF REDEMPTION
 
    In some states, after sale pursuant to a deed of trust or foreclosure of the
mortgage,  there are statutory periods during which the mortgagor and foreclosed
junior lienors may redeem the property from the foreclosure sale. One effect  of
the  statutory right of redemption  is to diminish the  ability of the lender to
sell the foreclosed property  because the right of  redemption would defeat  the
title of any purchaser from the lender subsequent to foreclosure or sale under a
deed  of trust.  As a practical  matter, the  lender may therefore  be forced to
retain the  property and  pay the  expenses of  ownership until  the  redemption
period has run.
 
ANTI-DEFICIENCY LEGISLATION AND OTHER LIMITATIONS ON
  LENDERS
 
    Certain  states  have  imposed  statutory  prohibitions  which  restrict  or
eliminate the remedies of a lender under a deed of trust or a mortgage. In  some
states,  statutes limit the right of the  lender to obtain a deficiency judgment
against the mortgagor  following sale under  a deed of  trust or foreclosure.  A
deficiency  judgment would be  a personal judgment  against the former mortgagor
equal in most cases to the difference  between the net amount realized upon  the
public  sale  of the  real  property and  the amount  due  to the  lender. Other
statutes may require the lender to exhaust the security afforded under a deed of
trust or mortgage by foreclosure in an  attempt to satisfy the full debt  before
bringing  a  personal action  against the  mortgagor.  Some state  statutes also
prohibit any deficiency judgment where the  loan proceeds were used to  purchase
an  owner-occupied  dwelling.  Finally,  other  statutory  provisions  limit any
deficiency judgment against the  former mortgagor following  a judicial sale  to
the excess of the outstanding debt over the fair market value of the property at
the time of the public sale. The basic purpose of these statutes is to prevent a
lender  from obtaining a large deficiency  judgment against the former mortgagor
as a result of low or no bids at the judicial sale.
 
    Generally, Article 9 of  the UCC governs  foreclosure on Cooperative  shares
and  the  related proprietary  lease or  occupancy  agreement. Some  courts have
interpreted Article  9  to prohibit  or  limit  a deficiency  award  in  certain
circumstances,  including circumstances where the  disposition of the collateral
(which, in  the  case  of  a  Cooperative Loan,  would  be  the  shares  of  the
Cooperative  and the related  proprietary lease or  occupancy agreement) was not
conducted in a commercially reasonable manner.
 
    In addition  to  anti-deficiency  and related  legislation,  numerous  other
statutory  provisions,  including the  federal  bankruptcy laws  and  state laws
affording relief to  debtors, may interfere  with or affect  the ability of  the
secured  mortgage lender to collect  the full amount of  interest due or realize
upon its security. For example, with respect to federal bankruptcy law, a  court
with federal bankruptcy
 
                                       56
<PAGE>
jurisdiction may permit a mortgagor through his or her Chapter 11, Chapter 12 or
Chapter  13  rehabilitative plan  to cure  a  monetary default  in respect  of a
mortgage loan  on  the  mortgagor's  residence by  paying  arrearages  within  a
reasonable  time  period  and  reinstating the  original  mortgage  loan payment
schedule even though the  lender accelerated the  mortgage loan and  foreclosure
proceedings  had occurred  prior to  the filing  of the  debtor's petition. Some
courts with federal bankruptcy  jurisdiction have approved  plans, based on  the
particular  facts  of the  reorganization case,  that effected  the curing  of a
mortgage loan default by paying arrearages over a number of years.
 
    Courts with federal bankruptcy jurisdiction have also held that the terms of
a mortgage loan  secured by  property of the  mortgagor may  be modified.  These
courts have held that such modifications may include reducing the amount of each
monthly payment, changing the rate of interest, altering the repayment schedule,
and  reducing the lender's security interest to the value of the residence, thus
leaving the  lender in  the position  of a  general unsecured  creditor for  the
difference between the value of the residence and the outstanding balance of the
loan.  Courts  with federal  bankruptcy jurisdiction  similarly  may be  able to
modify the terms of a Cooperative Loan.
 
    The Code  provides  priority to  certain  tax liens  over  the lien  of  the
security  instrument. Numerous federal  and some state  consumer protection laws
impose substantive requirements upon lenders in connection with the  origination
and   the  servicing  of   mortgage  loans.  These   laws  include  the  federal
Truth-in-Lending Act,  Real  Estate  Settlement  Procedures  Act,  Equal  Credit
Opportunity  Act, Fair Credit Billing Act, Fair Credit Reporting Act and related
statutes. These federal laws impose specific statutory liabilities upon  lenders
who  originate mortgage loans and who fail  to comply with the provisions of the
law. In some cases, this liability may affect assignees of the mortgage loans.
 
ENFORCEABILITY OF CERTAIN PROVISIONS
 
    The standard  forms of  note, mortgage  and deed  of trust  used by  lenders
generally  contain  "due-on-sale" clauses.  These clauses  permit the  lender to
accelerate the maturity of the loan if the mortgagor sells, transfers or conveys
the property. The enforceability of these clauses was the subject of legislation
and litigation in  many states, and  in some cases  the enforceability of  these
clauses   was  limited  or  denied.  However,  the  Garn-St  Germain  Depository
Institutions Act of 1982 (the "Garn-St Germain Act") purports to pre-empt  state
statutory  and case law that prohibits  the enforcement of "due-on-sale" clauses
and permits lenders  to enforce these  clauses in accordance  with their  terms,
subject  to certain limited exceptions. The Garn-St Germain Act does "encourage"
lenders to permit assumption  of loans at  the original rate  of interest or  at
some  other rate less than the average of the original rate and the market rate.
In addition, certain states have  continuing restrictions on the  enforceability
of due-on-sale clauses for certain loans.
 
    The  Garn-St Germain Act also sets forth  nine specific instances in which a
mortgage lender covered by the  act (including federal savings associations  and
federal  savings banks) may not exercise a "due-on-sale" clause, notwithstanding
the fact  that a  transfer of  the  property may  have occurred.  These  include
intrafamily  transfers, certain  transfers by operation  of law,  leases of less
than  three  years  and  the  creation  of  a  junior  encumbrance.  Regulations
promulgated  under the Garn-St Germain  Act by the Federal  Home Loan Bank Board
(now the Office of Thrift Supervision) and statutes in some states also prohibit
the imposition of a prepayment penalty upon the acceleration of a loan  pursuant
to a "due-on-sale" clause. In addition, a few states have exercised their rights
under  the Garn-St  Germain Act to  limit the enforceability  of the due-on-sale
clauses in certain loans made prior to passage of the Garn-St Germain Act. As of
the date hereof,  certain states  have taken  action to  reimpose interest  rate
limits and/or to limit discount points or other charges.
 
    A consequence of the inability to enforce a due-on-sale clause may be that a
mortgagor's  buyer may assume  the existing mortgage loan  rather than paying it
off, if such existing loan bears an interest rate below the current market rate,
which may have an  impact upon the  average life of the  Mortgage Loans and  the
number of Mortgage Loans which may be outstanding until maturity.
 
    Under  the terms of the Soldiers' and  Sailors' Civil Relief Act of 1940, as
amended (the "Relief Act"),  a Mortgagor who enters  military service after  the
origination  of such Mortgagor's  Mortgage Loan (including a  Mortgagor who is a
member of  the National  Guard  or is  in  reserve status  at  the time  of  the
origination  of the Mortgage Loan and is later called to active duty) may not be
charged interest  above  an  annual  rate  of  6%  during  the  period  of  such
Mortgagor's active duty status, unless a court
 
                                       57
<PAGE>
orders  otherwise  upon application  of the  lender.  Any shortfall  in interest
collections resulting from the application of the Relief Act, to the extent  not
covered  by any  applicable credit enhancements,  could result in  losses to the
Holders of the  Certificates. In  addition, the Relief  Act imposes  limitations
which  would impair  the ability  of the  Servicer to  foreclose on  an affected
Mortgage Loan during the Mortgagor's period of active duty status. Thus, in  the
event  that such  a Mortgage  Loan goes  into default,  there may  be delays and
losses occasioned by the inability to  realize upon the Mortgaged Property in  a
timely fashion.
 
APPLICABILITY OF USURY LAWS
 
    Title V of the Depository Institutions Deregulation and Monetary Control Act
of  1980,  enacted  in  March  1980  ("Title  V"),  provides  that  state  usury
limitations shall not apply to certain types of residential first mortgage loans
originated by certain lenders  after March 31, 1980.  A similar federal  statute
was  in effect with respect to mortgage loans made during the first three months
of 1980. The Federal Home Loan Bank Board (now the Office of Thrift Supervision)
has issued  regulations governing  the implementation  of Title  V. The  statute
authorizes  any state to reimpose interest  rate limits by adopting before April
1, 1983, a law or  constitutional provision which expressly rejects  application
of  the federal  law. In addition,  even where Title  V is not  so rejected, any
state is  authorized to  adopt a  provision limiting  discount points  or  other
charges prior to origination on mortgage loans covered by Title V.
 
    Under  the Company's mortgage  purchase program, each  Lender is required to
represent and warrant to the Company  that all Mortgage Loans are originated  in
full  compliance with  applicable state laws,  including usury  laws. Based upon
such representations and warranties  from the Lenders, the  Company will make  a
similar  representation and warranty in the Pooling Agreement for each Series to
the  Trustee  for  the  benefit  of  Certificateholders.  See  "Description   of
Certificates-- Representations and Warranties".
 
ALTERNATIVE MORTGAGE INSTRUMENTS
 
    Alternative  mortgage instruments, including adjustable-rate mortgage loans,
originated by non-federally chartered  lenders have historically been  subjected
to  a variety of  restrictions. Such restrictions differed  from state to state,
resulting in  difficulties  in  determining  whether  a  particular  alternative
mortgage  instrument originated  by a  state-chartered lender  was in compliance
with applicable  law.  These difficulties  were  alleviated substantially  as  a
result of the enactment of Title VIII of the Garn-St Germain Act ("Title VIII").
Title  VIII  provides  that,  notwithstanding any  state  law  to  the contrary,
state-chartered  banks  may  originate   alternative  mortgage  instruments   in
accordance  with regulations promulgated by the Comptroller of the Currency with
respect to origination  of alternative mortgage  instruments by national  banks,
state-chartered  credit unions may originate alternative mortgage instruments in
accordance  with   regulations  promulgated   by  the   National  Credit   Union
Administration  with respect to origination  of alternative mortgage instruments
by  federal  credit  unions,  and  all  other  non-federally  chartered  housing
creditors,    including   state-chartered   savings   and   loan   associations,
state-chartered savings  banks and  mortgage  banking companies,  may  originate
alternative  mortgage instruments in accordance with the regulations promulgated
by the Federal Home Loan Bank Board (now the Office of Thrift Supervision)  with
respect  to origination of  alternative mortgage instruments  by federal savings
and  loan  associations.  Title  VIII   provides  that  any  state  may   reject
applicability  of the provisions of Title VIII by adopting, prior to October 15,
1985, a law or constitutional provision expressly rejecting the applicability of
such provisions. Certain states have taken such action.
 
ENVIRONMENTAL RISKS
 
    Real property pledged as security to  a lender may be subject to  unforeseen
environmental  risks.  Under  the laws  of  certain states,  contamination  of a
property may give rise to a lien on the property to assure the payment of  costs
of  clean-up. In  several states such  a lien has  priority over the  lien of an
existing mortgage against  such property. In  addition, under the  laws of  some
states  and under the federal Comprehensive Environmental Response, Compensation
and Liability Act of 1980 ("CERCLA"), a  lender may be liable, as an "owner"  or
"operator",  for  costs  arising  out  of  releases  or  threatened  releases of
hazardous substances that require remedy at  a mortgaged property, if agents  or
employees  of the lender have become  sufficiently involved in the operations of
the borrower,
 
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regardless of whether or not the environmental damage or threat was caused by  a
prior  owner. Furthermore, a decision in May  1990 of the United States Court of
Appeals for the Eleventh  Circuit in UNITED STATES  V. FLEET FACTORS CORP.  very
narrowly  construed the provision in CERCLA excluding secured lenders from those
who may  be  liable for  remedial  costs.  In construing  the  statutory  phrase
"without participation in management", which is a qualification for the security
interest  exclusion, the court held that a  lender need not have involved itself
in the  day-to-day  operations of  the  facility or  participated  in  decisions
relating  to hazardous waste to be liable; rather, liability could attach to the
lender if its involvement with the management of the facility is broad enough to
support the inference that the lender could affect hazardous waste decisions  if
it  so  chose.  The court  added  that  a lender's  capacity  to  influence such
decisions could be inferred from the extent of its involvement in the facility's
financial management.  A  subsequent decision  by  the United  States  Court  of
Appeals  for the Ninth Circuit in In RE BERGSOE METAL CORP. ruled that a secured
lender had no liability absent "some  actual management of the facility" on  the
part  of the  lender. Also, if  the lender takes  title to or  possession of the
property, it may be deemed to have obviated the security interest exclusion  and
to  be liable for clean-up  costs pursuant to CERCLA. If  a lender is or becomes
liable, it may be precluded from bringing an action for contribution against the
owner or operator who created the environmental hazard. Such clean-up costs  may
be  substantial. It is possible that such  costs could become a liability of the
related Trust  Fund  and  occasion  a  loss  to  Certificateholders  in  certain
circumstances described above if such remedial costs were incurred.
 
    Except  as otherwise specified  in the applicable  Prospectus Supplement, at
the time the Mortgage  Loans were originated, no  environmental assessment or  a
very  limited environment assessment of the  Mortgaged Properties will have been
conducted.
 
                              ERISA CONSIDERATIONS
 
    The Employee Retirement Income Security  Act of 1974, as amended  ("ERISA"),
imposes  certain requirements on employee benefit  plans and other benefit plans
or arrangements which are subject to ERISA or Section 4975 of the Code ("Plans")
and on those  persons who  are fiduciaries with  respect to  Plans or  otherwise
responsible  for the  investment of "plan  assets" of Plans  ("Plan Assets"). In
accordance with  the  general  fiduciary  standards  of  ERISA,  an  ERISA  Plan
fiduciary should consider whether an investment in the Certificates is permitted
by  the documents and instruments governing the Plan, consistent with the Plan's
overall investment policy  and appropriate  in view  of the  composition of  its
investment portfolio.
 
    Employee  benefit plans which are governmental  plans (as defined in Section
3(32) of ERISA) and certain church plans (as defined in Section 3(33) of  ERISA)
are  not  subject to  the requirements  of ERISA  or Section  4975 of  the Code.
Accordingly, assets of such plans may be invested in the Certificates subject to
the provisions of applicable state law and,  in the case of any such plan  which
is  qualified under Section  401(a) of the Code,  the restrictions imposed under
Section 503 of the Code.
 
    In addition to imposing general fiduciary standards, ERISA prohibits a broad
range of transactions  involving Plan  Assets and certain  persons ("Parties  in
Interest")  who have certain  specified relationships to  the Plan under Section
406 of ERISA, and  taxes any such  transaction under Section  4975 of the  Code,
unless  an exemption applies. If  the assets of a  Mortgage Pool are treated for
purposes of  ERISA and  Section 4975  of the  Code as  Plans or  other  entities
holding  Plan  Assets  with  respect  to  Plans,  collective  investment  funds,
insurance company  general  or  separate  accounts  (collectively,  "Plan  Asset
Investors")  that purchase  or hold  Certificates of  the applicable  Series, an
investment in Certificates by any such Plan  might constitute or give rise to  a
prohibited  transaction  under  ERISA or  Section  4975  of the  Code,  unless a
statutory or  administrative  exemption  applies. Violation  of  the  prohibited
transaction  rules could result  in the imposition of  excise taxes and/or other
penalties under ERISA and/or Section 4975 of the Code.
 
PLAN ASSETS REGULATION
 
    The United States Department of Labor ("DOL") has issued a final  regulation
(the  "Regulation") under which  the assets of  an entity in  which a Plan Asset
Investor makes an equity  investment will be treated  as Plan Assets in  certain
circumstances.  Unless  the Regulation  provides  an exemption  from  this "plan
asset"  treatment,  and  if  an  exemption  is  not  otherwise  available  under
 
                                       59
<PAGE>
ERISA,  an undivided portion of  the assets of a  Mortgage Pool will be treated,
for purposes  of applying  the fiduciary  standards and  prohibited  transaction
rules of ERISA and Section 4975 of the Code, as Plan Assets with respect to each
Plan which becomes a Certificateholder of the applicable Series.
 
    The  Regulation  provides  an  exemption  from  "plan  asset"  treatment for
securities issued by an entity if, immediately after the most recent acquisition
of any equity interest in the entity, less  than 25% of the value of each  class
of  equity interests in the entity, excluding interests held by a person who has
discretionary authority or control with respect to the assets of the entity  (or
any  affiliate of  such a  person), is held  by "benefit  plan investors" (I.E.,
Plans, governmental, foreign  and other  employee benefit plans  not subject  to
ERISA  and  entities  holding Plan  Assets).  Because the  availability  of this
exemption with respect  to any Mortgage  Pool depends upon  the identity of  the
Certificateholders  of  the  applicable Series  at  any  time, there  can  be no
assurance as to  whether any Series  or Class of  Certificates will qualify  for
this exemption.
 
PROHIBITED TRANSACTION CLASS EXEMPTION 83-1
 
    Prohibited  Transaction Class  Exemption 83-1  (Class Exemption  for Certain
Transactions Involving Mortgage Pool  Investment Trusts) ("PTCE 83-1")  permits,
subject  to  certain conditions,  certain  transactions involving  the creation,
maintenance and  termination  of  certain residential  mortgage  pools  and  the
acquisition  and  holding  of  certain  residential  mortgage  pool pass-through
certificates by Plan  Asset Investors,  regardless of whether  (a) the  mortgage
pool  is  exempt  from "plan  asset"  treatment  or (b)  the  transactions would
otherwise be prohibited under ERISA or Section 4975 of the Code. If the  general
conditions (described below) of PTCE 83-1 are satisfied, an investment by a Plan
in  Certificates (1) will be  exempt from the prohibitions  of Section 406(a) of
ERISA (relating  generally  to  Plan Asset  transactions  involving  Parties  in
Interest  who are not fiduciaries) if the  Certificates are purchased at no more
than fair market value, and (2) will be exempt from the prohibitions of Sections
406(b)(1) and (2) of ERISA (relating  generally to Plan Asset transactions  with
fiduciaries)  if,  in  addition,  the purchase  is  approved  by  an independent
fiduciary, the Plan Asset Investor pays no more for the Certificates than  would
be  paid  in an  arm's  length transaction  with  an unrelated  party,  no sales
commission is  paid to  the Company  as Mortgage  Pool sponsor,  the Plan  Asset
Investor  does not purchase more than 25%  of the Certificates of the applicable
Series, and at  least 50% of  the Certificates  of that Series  is purchased  by
persons independent of the Company, the Trustee and the Insurer, as applicable.
 
    PTCE  83-1 sets forth  three general conditions which  must be satisfied for
any transaction  to be  eligible for  exemption:  (1) the  existence of  a  pool
trustee  who is not an  affiliate of the pool sponsor;  (2) the maintenance of a
system of  insurance or  other  protection for  the  pooled mortgage  loans  and
property  securing such  loans, and for  indemnifying certificateholders against
reductions in pass-through payments due to  property damage or defaults in  loan
payments; and (3) a limitation on the amount of the payment retained by the pool
sponsor,  together with  other funds  inuring to its  benefit, to  not more than
adequate  consideration  for   selling  the  mortgage   loans  plus   reasonable
compensation for services provided by the pool sponsor to the mortgage pool.
 
    Unless  otherwise  specified in  the  applicable Prospectus  Supplement, the
Trustee for each  Series will be  unaffiliated with the  Company, and the  first
general  condition of  PTCE 83-1  will be satisfied  for each  such Series. With
respect to the second general condition of PTCE 83-1, the Company intends to use
its best efforts  to establish  for each  Series of  Certificates an  insurance,
indemnification,  subordination  or other  method of  credit support  which will
adequately protect the  Mortgage Pools and  indemnify Certificateholders of  the
applicable   Series  against  pass-through  payment  reductions  resulting  from
property damage  or  defaults  in  loan payments.  See  "Description  of  Credit
Enhancements".  The amount, method and description  of the credit support method
applicable to  a  Series  of Certificates  will  be  set forth  in  the  related
Prospectus Supplement. With respect to the third general condition of PTCE 83-1,
the  Company intends  to use  its best  efforts to  establish for  each Series a
compensation method which will produce for the Company total compensation  which
will  not exceed adequate  consideration for forming  the Mortgage Pool, selling
the Certificates and serving as Master  Servicer of the Mortgage Pool.  However,
the  Company does not guarantee that its credit support and compensation methods
will be sufficient to  meet the second and  third general conditions  (described
above) with respect to any Series.
 
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<PAGE>
    As indicated in the two preceding paragraphs, the continued maintenance of a
system  of  insurance or  other  protection for  the  pooled mortgage  loans and
property securing such  loans, and for  indemnifying certificateholders  against
reductions  in pass-through payments due to  property damage or defaults in loan
payments, is one of the three general conditions that must be satisfied for  any
transaction  involving a Mortgage Pool to  remain eligible for exemption by PTCE
83-1 from the  prohibited transaction  rules of ERISA  and Section  4975 of  the
Code.  If the credit support  method established for any  Series is cancelled or
terminated, or if  the credit  support is  reduced to  such an  extent that  its
coverage  amount is  less than  the greater  of (a)  1% of  the aggregate unpaid
principal balance of the Mortgage Loans  or (b) the unpaid principal balance  of
the  largest single  Mortgage Loan  (see "Description  of Credit Enhancements"),
then the Mortgage Pool relating to that Series may no longer satisfy the general
conditions of  PTCE 83-1.  In  such event,  the  exemption from  the  prohibited
transaction rules afforded by PTCE 83-1 may no longer be available.
 
    One  or more Series of  Certificates may be offered  to Plan Asset Investors
through a forward  delivery commitment  contract, which  is a  contract for  the
purchase  of Certificates to  be delivered at an  agreed future settlement date.
PTCE 83-1 permits the sale of Certificates to a Plan Asset Investor pursuant  to
such  a contract,  provided that  the forward  delivery commitment  is expressly
approved by a  fiduciary who  is independent of  the Company,  the Trustee,  the
Insurer  (if any) and their respective affiliates,  and who has the authority to
manage and  control  the Plan  Assets  being  committed for  investment  in  the
Certificates.
 
    PTCE  83-1 will  not provide  exemptive relief with  respect to  a Series of
Certificates evidencing interests in Trust Funds that include Cooperative Loans.
If a Series of  Certificates is subdivided  into two or  more Classes which  are
entitled  to disproportionate allocations of the principal and interest payments
on the Mortgage Loans, the availability  of the exemption afforded by PTCE  83-1
may be adversely affected, as described in the applicable Prospectus Supplement.
Moreover,  if any Class of Certificates  is entitled to pass-through payments of
principal (but no or only nominal interest) or interest (but no or only  nominal
principal), PTCE 83-1 will not exempt holders of that Class of Certificates from
the prohibited transaction rules of ERISA and Section 4975 of the Code.
 
OTHER EXEMPTIONS
 
    If  for any reason PTCE 83-1 does  not provide an exemption for a particular
Certificateholder who is a  Plan Asset Investor, one  of three other  prohibited
transaction  class exemptions  issued by the  DOL might apply,  I.E., PTCE 95-60
(Class Exemption for  Certain Transactions Involving  Insurance Company  General
Accounts),  PTCE 91-38 (Class Exemption  for Certain Transactions Involving Bank
Collective  Investment   Funds),  PTCE   90-1  (Class   Exemption  for   Certain
Transactions Involving Insurance Company Pooled Separate Accounts) or PTCE 84-14
(Class Exemption for Plan Asset Transactions Determined by Independent Qualified
Professional  Asset Managers). There can be no assurance that any of these class
exemptions will apply  with respect to  any particular Plan  Asset Investor  or,
even  if it were  to apply, that  the exemption would  apply to all transactions
involving the Mortgage  Pool. In  addition, the  underwriter with  respect to  a
particular  Series  may  be  the recipient  of  a  final  prohibited transaction
exemption which, if so  specified in the  applicable Prospectus Supplement,  may
accord  a  Plan  Asset Investor  protection  from violations  of  the prohibited
transaction rules  of ERISA  and Section  4975 of  the Code  if the  Plan  Asset
Investor  satisfies  the  conditions  described  in  the  applicable  Prospectus
Supplement.
 
GENERAL CONSIDERATIONS
 
    In summary, the Company, the Trustee, the Servicer, any insurer, the obligor
under  any  other  credit  enhancement  instrument,  any  Seller/Servicer,   any
underwriter  for any Series of Certificates, as applicable, and their respective
affiliates might be considered or might become Parties in Interest with  respect
to  a  Plan  Asset  Investor.  In that  event,  the  acquisition  or  holding of
Certificates of the  applicable Series or  Class by  or on behalf  of such  Plan
Asset  Investor might be viewed as giving rise to a prohibited transaction under
ERISA and Section 4975  of the Code,  unless PTCE 83-1  or another exemption  is
available.  Accordingly,  before  a  Plan Asset  Investor  makes  the investment
decision to  purchase, to  commit to  purchase or  to hold  Certificates of  any
Series or Class, the Plan Asset Investor should determine (a) whether the second
and  third  general conditions  and the  specific conditions  (described briefly
above) of PTCE  83-1 have  been satisfied;  (b) whether  adequate protection  is
 
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<PAGE>
accorded  by any prohibited transaction exemption issued to the underwriter with
respect to  the applicable  Series, as  described in  the applicable  Prospectus
Supplement;  (c) whether  any other  prohibited transaction  class exemption (if
required) is available under ERISA and Section 4975 of the Code; or (d)  whether
an exemption from "plan asset" treatment is available to the applicable Mortgage
Pool.  The Plan Asset Investor should also consult the ERISA discussion, if any,
in the applicable  Prospectus Supplement for  further information regarding  the
application  of ERISA  and Section 4975  of the Code  to any Series  or Class of
Certificates.
 
    ANY PLAN  ASSET  INVESTOR THAT  PROPOSES  TO  USE PLAN  ASSETS  TO  PURCHASE
CERTIFICATES  SHOULD CONSULT WITH ITS OWN  COUNSEL WITH RESPECT TO THE POTENTIAL
CONSEQUENCES UNDER  ERISA AND  THE  CODE OF  THE  ACQUISITION AND  OWNERSHIP  OF
CERTIFICATES.
 
                    CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    The  following is a  general discussion of  the anticipated material federal
income tax  consequences  of the  purchase,  ownership and  disposition  of  the
Certificates  offered  hereunder. It  does not  purport  to discuss  all federal
income tax  consequences that  may  be applicable  to particular  categories  of
investors,  some of which may  be subject to special  rules and does not address
the tax  consequences of  persons holding  Certificates as  part of  a hedge  or
hedging  transaction. Further, the authorities on which this discussion is based
are subject to change or  differing interpretations, which changes or  differing
interpretations  could apply retroactively. This discussion does not address the
state or local tax  consequences of the purchase,  ownership and disposition  of
such   Certificates.  Investors  should  consult   their  own  tax  advisors  in
determining the federal, state, local or  other tax consequences to them of  the
purchase, ownership and disposition of the Certificates offered hereunder.
 
    The  following  discussion  addresses  certificates  ("REMIC  Certificates")
representing interests in a  Mortgage Pool ("REMIC Mortgage  Pool") as to  which
the  Master Servicer  will cause  to elect treatment  as a  real estate mortgage
investment  conduit  ("REMIC")   under  Sections  860A   through  860G   ("REMIC
Provisions") of the Code. Under the REMIC Provisions, REMICs may issue "regular"
interests and must issue one and only one class of "residual" interests. A REMIC
Certificate  representing a  regular interest in  a REMIC Mortgage  Pool will be
referred  to  as  a  "REMIC   Regular  Certificate"  and  a  REMIC   Certificate
representing a residual interest in a REMIC Mortgage Pool will be referred to as
a "REMIC Residual Certificate".
 
    The  following discussion is based in part upon the rules governing original
issue discount that are set  forth in Code Sections  1271 through 1273 and  1275
and  in Treasury regulations issued under the original issue discount provisions
of the Code (the "OID Regulations"),  and the Treasury regulations issued  under
the provisions of the Code relating to REMICs (the "REMIC Regulations"). The OID
Regulations  generally are effective with respect  to debt instruments issued on
or after April 4, 1994.
 
  A. CLASSIFICATION OF REMIC TRUST FUNDS
 
    With respect  to each  Series of  REMIC Certificates,  Orrick, Herrington  &
Sutcliffe,  special counsel to the Company, will deliver their opinion generally
to the effect that, assuming (i) a REMIC election is made timely in the required
form, (ii)  the Master  Servicer complies  with all  provisions of  the  related
Pooling  Agreement,  (iii)  certain  representations set  forth  in  the Pooling
Agreement are  true, and  (iv)  there is  continued compliance  with  applicable
provisions  of the Code, as it may be  amended from time to time, and applicable
Treasury regulations issued  thereunder, the  related REMIC  Mortgage Pool  will
qualify as a REMIC and the classes of interests offered will be considered to be
regular  interests or residual interests in  that REMIC Mortgage Pool within the
meaning of the REMIC Provisions.
 
    Holders of REMIC Certificates should be aware that, if an entity electing to
be treated  as  a  REMIC fails  to  comply  with  one or  more  of  the  ongoing
requirements  of the  Code for  REMIC status during  any taxable  year, the Code
provides that  the entity  will not  be treated  as a  REMIC for  such year  and
thereafter.  In such event, an  entity electing to be treated  as a REMIC may be
taxable as a separate  corporation under Treasury  regulations, and the  related
REMIC  Certificates may  not be  accorded the  status described  below under the
heading "Characterization of Investments in REMIC Certificates". In the case  of
an  inadvertent  termination of  REMIC status,  the  Code provides  the Treasury
 
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Department with  authority  to  issue regulations  providing  relief.  Any  such
relief,  however, may be accompanied  by sanctions, such as  the imposition of a
corporate tax on all or a portion of  the REMIC's income for the period of  time
in which the requirements for REMIC status are not satisfied.
 
  B. CHARACTERIZATION OF INVESTMENTS IN REMIC CERTIFICATES
 
    In  general,  REMIC  Certificates are  not  treated for  federal  income tax
purposes as ownership interests in the assets of a REMIC Mortgage Pool. However,
with respect to taxable  years of a  Certificateholder beginning after  December
31,  1986, (i) REMIC  Certificates held by  a mutual savings  bank or a domestic
building and loan association will  constitute "qualifying real property  loans"
within the meaning of Code Section 593(d) in the same proportion that the assets
of  the REMIC Mortgage Pool underlying  such Certificates ("Assets") would be so
treated;  (ii)  REMIC  Certificates  held  by  a  domestic  building  and   loan
association  will constitute a "regular or  residual interest in a REMIC" within
the meaning of Code Section 7701(a)(19)(C)(xi)  in the same proportion that  the
Assets would be treated as "loans.......secured by an interest in real property"
within the meaning of
Code  Section 7701(a)(19)(C)(v)  or as  other assets  described in  Code Section
7701(a)(19)(C); and (iii) REMIC  Certificates held by  a real estate  investment
trust  will constitute "real  estate assets" within the  meaning of Code Section
856(c)(5)(A),  and  interest  on  the  REMIC  Certificates  will  be  considered
"interest  on obligations secured by mortgages  on real property or on interests
in real property" within  the meaning of Code  Section 856(c)(3)(B) in the  same
proportion that, for both purposes, the Assets would be treated as "interests in
real  property" as defined in Code Section  856(c)(6)(C) (or, as provided in the
Committee  Report,  as  "real  estate   assets"  as  defined  in  Code   Section
856(c)(6)(B)).  See, in this regard, "--Characterization of Investments in Trust
Certificates--Buydown Mortgage Loans", below.  Moreover, if 95%  or more of  the
Assets  qualify for any of the foregoing treatments, the REMIC Certificates will
qualify for  the corresponding  status in  their entirety.  Investors should  be
aware  that the investment  of amounts in  any reserve account  in assets not so
qualifying would,  and holding  property acquired  by foreclosure  pending  sale
might,  reduce the amount  of the REMIC  Certificate that would  qualify for the
foregoing treatment. The  REMIC Regulations  provide that  payments on  Mortgage
Loans  held pending distribution  are considered part of  the Mortgage Loans for
purposes of Code Sections  593(d) and 856(c)(5)(A); it  is unclear whether  such
collected   payments  would  be   so  treated  for   purposes  of  Code  Section
7701(a)(19)(c)(v), but there  appears to  be no reason  why analogous  treatment
should  not  be  given to  such  collected  payments under  that  provision. The
determination as to the  percentage of the REMIC's  assets that will  constitute
assets described in the foregoing sections of the Code will be made with respect
to each calendar quarter based on the average adjusted basis of each category of
the assets held by the REMIC during such calendar quarter. The REMIC will report
those  determinations  to  Certificateholders in  the  manner and  at  the times
required  by  applicable   Treasury  regulations.   The  applicable   Prospectus
Supplement  or the related Current  Report on Form 8-K  for each Series of REMIC
Certificates will describe the Assets as of the Cut-Off Date. REMIC Certificates
held  by   certain  financial   institutions   will  constitute   "evidence   of
indebtedness"  within the meaning of Code  Section 582(c)(1); in addition, REMIC
Regular Certificates acquired by a REMIC in accordance with the requirements  of
Section  860G(a)(3)(C) or Section  860G(a)(4)(B) of the Code  will be treated as
"qualified mortgages" for purposes of Code Section 860D(a)(4).
 
  C. TAXATION OF OWNERS OF REMIC REGULAR CERTIFICATES
 
    Except  as  otherwise   stated  in  this   discussion,  the  REMIC   Regular
Certificates will be treated for federal income tax purposes as debt instruments
issued  by the REMIC Mortgage  Pool and not as  ownership interests in the REMIC
Mortgage Pool or its Assets. In  general, interest, original issue discount  and
market  discount paid or accrued on a  REMIC Regular Certificate will be treated
as  ordinary  income  to   the  holder  of   such  REMIC  Regular   Certificate.
Distributions  in reduction  of the stated  redemption price at  maturity of the
REMIC Regular Certificate will be treated as  a return of capital to the  extent
of  such  holder's basis  in such  REMIC Regular  Certificate. Holders  of REMIC
Regular Certificates  that  otherwise  report  income under  a  cash  method  of
accounting  will  be required  to report  income with  respect to  REMIC Regular
Certificates under an accrual method.
 
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<PAGE>
   1. ORIGINAL ISSUE DISCOUNT
 
    Certain  REMIC  Regular  Certificates  may be  issued  with  "original issue
discount" within  the meaning  of Code  Section 1273(a).  Any holders  of  REMIC
Regular  Certificates  issued with  original  issue discount  generally  will be
required to  include  original  issue  discount in  income  as  it  accrues,  in
accordance  with  a  constant  interest  method  that  takes  into  account  the
compounding of interest, in advance of  the receipt of the cash attributable  to
such income. The Company will report annually (or more often if required) to the
Internal Revenue Service ("IRS") and to Certificateholders such information with
respect   to  the  original  issue  discount   accruing  on  the  REMIC  Regular
Certificates as may  be required  under Code  Section 6049  and the  regulations
thereunder. See "--Reporting and Other Administrative Matters of REMICS" below.
 
    Rules  governing original issue discount are set forth in Code Sections 1271
through 1273 and 1275 and, to some extent, in the OID Regulations. Code  Section
1272(a)(6)  provides special original  issue discount rules  applicable to REMIC
Regular Certificates. Regulations have  not yet been  proposed or adopted  under
Section  1272(a)(6) of the Code. Further,  application of the OID Regulations to
the REMIC Regular Certificates remains unclear in some respects because the  OID
Regulations  generally  purport not  to apply  to  instruments to  which section
1272(a)(6) applies such  as REMIC Regular  Certificates, and separately  because
they  either  do not  address, or  are subject  to varying  interpretations with
regard to, several relevant issues.
 
    Code Section  1272(a)(6)  requires  that a  mortgage  prepayment  assumption
("Prepayment  Assumption") be  used in computing  the accrual  of original issue
discount on REMIC Regular Certificates and for certain other federal income  tax
purposes. The Prepayment Assumption is to be determined in the manner prescribed
in Treasury regulations. To date, no such regulations have been promulgated. The
Committee Report indicates that the regulations will provide that the Prepayment
Assumption,  if any, used with  respect to a particular  transaction must be the
same as that used  by the parties in  pricing the transaction. Unless  otherwise
specified  in  the  applicable Prospectus  Supplement,  the Company  will  use a
percentage  of  the  Basic  Prepayment  Assumption  (or  such  other  Prepayment
Assumption  as  may be  specified in  the  applicable Prospectus  Supplement) in
reporting original  issue  discount  that  is  consistent  with  this  standard.
However,  the Company does  not make any representation  that the Mortgage Loans
will in fact prepay at that percentage of the Basic Prepayment Assumption or  at
any   other  rate.  Each  investor  must  make   its  own  decision  as  to  the
appropriate prepayment  assumption to  be used  in deciding  whether or  not  to
purchase  any of the REMIC Regular  Certificates. The Prospectus Supplement with
respect to a Series  of REMIC Certificates will  disclose the percentage of  the
Basic  Prepayment  Assumption (or  such other  Prepayment  Assumption as  may be
specified therein) to be used in reporting original issue discount, if any,  and
for certain other federal income tax purposes.
 
    The  total amount of original issue  discount on a REMIC Regular Certificate
is the excess of the "stated redemption price at maturity" of the REMIC  Regular
Certificate  over its  "issue price". Except  as discussed in  the following two
paragraphs, in general, the issue price  of a particular Class of REMIC  Regular
Certificates  offered hereunder will be the  price at which a substantial amount
of REMIC  Regular  Certificates of  that  Class are  first  sold to  the  public
(excluding bond houses and brokers).
 
    If a REMIC Regular Certificate is sold with accrued interest that relates to
a  period prior to the issue date  of such REMIC Regular Certificate, the amount
paid for the accrued  interest will be treated  instead as increasing the  issue
price  of the REMIC Regular Certificate. In  addition, that portion of the first
interest payment in  excess of  interest accrued from  the Closing  Date to  the
first  Distribution  Date  will  be treated  for  federal  income  tax reporting
purposes as includible in the stated  redemption price at maturity of the  REMIC
Regular Certificate, and as excludible from income when received as a payment of
interest  on the first Distribution Date.  The OID Regulations suggest that some
or all of  this pre-issuance  accrued interest "may"  be treated  as a  separate
asset  (and hence not includible in a REMIC Regular Certificate's issue price or
stated redemption price at  maturity), whose cost is  recovered entirely out  of
interest  paid on the first Distribution Date.  It is unclear how such treatment
would be elected under the OID Regulations and whether an election could be made
unilaterally by a Certificateholder.
 
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<PAGE>
    The stated redemption price  at maturity of a  REMIC Regular Certificate  is
equal  to the total  of all payments to  be made on  such Certificate other than
"qualified stated  interest."  Under  the  OID  Regulations,  "qualified  stated
interest"  is interest that is unconditionally  payable at least annually during
the entire  term of  the Certificate  at either  (i) a  single fixed  rate  that
appropriately  takes into account the length of the interval between payments or
(ii) the current  values of  a single  "qualified floating  rate" or  "objective
rate"  (each, a  "Single Variable Rate").  A "current  value" is the  value of a
variable rate on any day that is no earlier than three months prior to the first
day on which that value is in effect  and no later than one year following  that
day.  A "qualified floating rate"  is a rate whose  variations can reasonably be
expected to measure  contemporaneous variations  in the cost  of newly  borrowed
funds  in the  currency in  which the  Certificate is  denominated. Such  a rate
remains qualified even though it is multiplied by a fixed, positive multiple not
exceeding 1.35,  increased  or decreased  by  a  fixed rate,  or  both.  Certain
combinations of rates constitute a single qualified floating rate, including (i)
interest  stated at  a fixed rate  for an initial  period of less  than one year
followed by a qualified floating rate if  the value of the floating rate at  the
closing  date is intended  to approximate the  fixed rate, and  (ii) two or more
qualified floating rates  that can be  expected to have  approximately the  same
values  throughout the term of  the Certificate. A combination  of such rates is
conclusively presumed to be a single floating rate if the values of all rates on
the closing date are within 0.25% of each other. A variable rate that is subject
to an  interest rate  cap,  floor, "governor"  or  similar restriction  on  rate
adjustment  may be a qualified  floating rate only if  such restriction is fixed
throughout the term of the instrument, or  is not reasonably expected as of  the
closing  date to cause the yield on  the debt instrument to differ significantly
from the expected yield  absent the restriction. An  "objective rate" is a  rate
(other  than a qualified floating rate)  determined using a single formula fixed
for the life of  the Certificate, which  is based on (i)  one or more  qualified
floating  rates (including a multiple or  inverse of a qualified floating rate),
(ii) one or more rates  each of which would be  a qualified floating rate for  a
debt instrument denominated in a foreign currency, (iii) the yield or changes in
price  of  one or  more items  of  "actively traded"  personal property,  (iv) a
combination of rates described in (i), (ii) and (iii), or (v) a rate  designated
by  the  IRS.  However, a  variable  rate is  not  an  objective rate  if  it is
reasonably expected that the average value of the rate during the first half  of
the  Certificate's term will differ significantly from the average value of such
rate during the final half  of its term. A combination  of interest stated at  a
fixed  rate for an initial period of less than one year followed by an objective
rate is treated as a single objective rate if the value of the objective rate at
the closing date is intended to  approximate the fixed rate; such a  combination
of rates is conclusively presumed to be a single objective rate if the objective
rate on the closing date does not differ from the fixed rate by more than 0.25%.
The qualified stated interest payable with respect to certain variable rate debt
instruments  not bearing stated interest at  a Single Variable Rate generally is
determined under the OID Regulations  by converting such instruments into  fixed
rate  debt  instruments.  Instruments qualifying  for  such  treatment generally
include those  providing for  stated interest  at (i)  more than  one  qualified
floating  rates, or at  (ii) a single fixed  rate and (a)  one or more qualified
floating rates  or (b)  a  single "qualified  inverse  floating rate"  (each,  a
"Multiple  Variable Rate").  A qualified inverse  floating rate  is an objective
rate equal to a fixed rate reduced by a qualified floating rate, the  variations
in  which  can  reasonably  be  expected  to  inversely  reflect contemporaneous
variations in the cost  of newly borrowed  funds (disregarding permissible  rate
caps,  floors, governors and similar restrictions  such as are described above).
Under these rules, some of the payments  of interest on a Certificate bearing  a
fixed  rate of interest for  an initial period followed  by a qualified floating
rate of  interest in  subsequent periods  could be  treated as  included in  the
stated  redemption price at  maturity if the  initial fixed rate  were to differ
sufficiently from the rate that would have been set using the formula applicable
to  subsequent  periods.  See  "--Variable  Rate  Certificates".  REMIC  Regular
Certificates offered hereby other than Certificates providing for variable rates
of  interest or for the accretion of interest are not anticipated to have stated
interest other than "qualified stated interest",  but if any such REMIC  Regular
Certificates  are  so  offered,  appropriate disclosures  will  be  made  in the
Prospectus Supplement. Some or all of the payments on REMIC Regular Certificates
providing for  the  accretion  of  interest  will  be  included  in  the  stated
redemption price at maturity of such Certificates.
 
    Under  a DE MINIMIS rule in the Code, as interpreted in the OID Regulations,
original issue discount on a REMIC Regular Certificate will be considered to  be
zero if such original issue discount is less than 0.25% of the stated redemption
price  at maturity of  the REMIC Regular Certificate  multiplied by the weighted
average  life  of  the  REMIC   Regular  Certificate.  For  this  purpose,   the
 
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<PAGE>
weighted average life of the REMIC Regular Certificate is computed as the sum of
the  amounts  determined by  multiplying the  amount of  each payment  under the
instrument (other than a  payment of qualified stated  interest) by a  fraction,
whose  numerator is the number of complete  years from the issue date until such
payment is  made,  and whose  denominator  is  the stated  redemption  price  at
maturity  of such REMIC Regular Certificate. The  IRS may be anticipated to take
the position that this rule should be applied taking into account the Prepayment
Assumption and the effect  of any anticipated investment  income. Under the  OID
Regulations,  REMIC Regular Certificates bearing  only qualified stated interest
except for any  "teaser" rate, interest  holiday or similar  provision would  be
treated  as subject  to the DE  MINIMIS rule if  the greater of  the deferred or
foregone interest or  the other  original issue discount  is less  than such  DE
MINIMIS amount.
 
    The OID Regulations generally would treat DE MINIMIS original issue discount
as  includible in income as each principal payment is made, based on the product
of the total amount of such DE  MINIMIS original issue discount and a  fraction,
whose numerator is the amount of such principal payment and whose denominator is
the   stated  principal  amount  of  the  REMIC  Regular  Certificate.  The  OID
Regulations also would permit a Certificateholder to elect to accrue DE  MINIMIS
original  issue discount into income currently based on a constant yield method.
See "Taxation  of  Owners of  REMIC  Regular Certificates--Market  Discount  and
Premium".
 
    Each  holder of a REMIC Regular Certificate must include in gross income the
sum of the  "daily portions"  of original issue  discount on  its REMIC  Regular
Certificate  for each day  during its taxable  year on which  it held such REMIC
Regular Certificate. For this purpose,  in the case of  an original holder of  a
REMIC Regular Certificate, the daily portions of original issue discount will be
determined  as follows. A calculation  will first be made  of the portion of the
original issue discount that accrued during each accrual period, that is, unless
otherwise stated  in  the applicable  Prospectus  Supplement, each  period  that
begins  or ends on a  date that corresponds to a  Distribution Date on the REMIC
Regular Certificate  and  begins on  the  first day  following  the  immediately
preceding accrual period (beginning on the Closing Date in the case of the first
such period). For any accrual period such portion will equal the excess, if any,
of (i) the sum of (A) the present value of all of the distributions remaining to
be  made on the REMIC Regular Certificate, if  any, as of the end of the accrual
period and (B) the  distribution made on such  REMIC Regular Certificate  during
the  accrual  period  of amounts  included  in  the stated  redemption  price at
maturity, over (ii) the adjusted issue  price of such REMIC Regular  Certificate
at  the beginning  of the  accrual period.  The present  value of  the remaining
payments referred to in the preceding  sentence will be calculated based on  (i)
the  yield to maturity  of the REMIC  Regular Certificate, calculated  as of the
settlement date,  giving  effect  to  the  Prepayment  Assumption,  (ii)  events
(including  actual  prepayments) that  have  occurred prior  to  the end  of the
accrual period, and (iii) the Prepayment Assumption. The adjusted issue price of
a REMIC Regular Certificate  at the beginning of  any accrual period will  equal
the  issue  price of  such  Certificate, increased  by  the aggregate  amount of
original issue  discount with  respect to  such REMIC  Regular Certificate  that
accrued in prior accrual periods, and reduced by the amount of any distributions
made  on  such REMIC  Regular Certificate  in prior  accrual periods  of amounts
included in the stated redemption price at maturity. The original issue discount
accruing during any accrual period will be allocated ratably to each day  during
the  period to determine the  daily portion of original  issue discount for each
day. With respect to an accrual period between the settlement date and the first
Distribution Date  on the  REMIC Regular  Certificate (notwithstanding  that  no
distribution  is scheduled to be made on such  date) that is shorter than a full
accrual period, the OID Regulations permit the daily portions of original  issue
discount to be determined according to any reasonable method.
 
    A  subsequent purchaser of  a REMIC Regular  Certificate that purchases such
REMIC Regular Certificate at a cost (not including payment for accrued qualified
stated interest) less  than its  remaining stated redemption  price at  maturity
will also be required to include in gross income, for each day on which it holds
such  REMIC Regular Certificate,  the daily portions  of original issue discount
with respect  to such  REMIC  Regular Certificate,  but  reduced, if  such  cost
exceeds  the "adjusted issue  price", by an  amount equal to  the product of (i)
such daily portions and (ii) a constant fraction, whose numerator is such excess
and whose  denominator  is the  sum  of the  daily  portions of  original  issue
discount  on such REMIC Regular Certificate for all  days on or after the day of
purchase. The adjusted issue price of  a REMIC Regular Certificate on any  given
day  is equal to  the sum of  the adjusted issue  price (or, in  the case of the
first   accrual   period,    the   issue   price)    of   the   REMIC    Regular
 
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<PAGE>
Certificate  at the beginning of the accrual period during which such day occurs
and the  daily portions  of original  issue discount  for all  days during  such
accrual   period  prior  to  such  day,  reduced  by  the  aggregate  amount  of
distributions previously  made  other  than distributions  of  qualified  stated
interest.
 
    VARIABLE  RATE  CERTIFICATES.    Purchasers  of  REMIC  Regular Certificates
bearing a variable rate  of interest should be  aware that there is  uncertainty
concerning  the  application  of Section  1272(a)(6)  of  the Code  and  the OID
Regulations to such Certificates. In the absence of other authority, the Company
intends to be guided by the provisions of the OID Regulations governing variable
rate debt instruments in  adapting the provisions of  Section 1272(a)(6) of  the
Code  to such  Certificates for  the purpose  of preparing  reports furnished to
Certificateholders. The effect of the  application of such provisions  generally
will  be to cause Certificateholders holding  Certificates bearing interest at a
Single  Variable  Rate  to  take  into   account  for  each  period  an   amount
corresponding  approximately to  the sum of  (i) the  qualified stated interest,
accruing on the outstanding face amount of the REMIC Regular Certificate as  the
stated  interest rate for that Certificate varies from time to time and (ii) the
amount of original  issue discount  that would  have been  attributable to  that
period  on the basis  of a constant yield  to maturity for a  bond issued at the
same time and issue price as the REMIC Regular Certificate, having the same face
amount and schedule of payments of principal as such Certificate, subject to the
same Prepayment Assumption, and  bearing interest at a  fixed rate equal to  the
value  of the applicable  qualified floating rate  or qualified inverse floating
rate in the case of  a Certificate providing for either  such rate, or equal  to
the fixed rate that reflects the reasonably expected yield on the Certificate in
the  case of a Certificate providing for an objective rate other than an inverse
floating rate, in  each case as  of the issue  date. Certificateholders  holding
REMIC  Regular  Certificates  bearing  interest  at  a  Multiple  Variable  Rate
generally will take into  account interest and original  issue discount under  a
similar  methodology, except that  the amounts of  qualified stated interest and
original issue  discount  attributable  to  such a  Certificate  first  will  be
determined for an equivalent fixed rate debt instrument, the assumed fixed rates
for  which are (a) for each qualified floating rate, the value of each such rate
as of  the closing  date (with  appropriate adjustment  for any  differences  in
intervals  between  interest  adjustment  dates), (b)  for  a  qualified inverse
floating rate, the value of the rate as  of the closing date, (c) for any  other
objective  rate,  the fixed  rate  that reflects  the  yield that  is reasonably
expected  for  the  Certificate,  and  (d)  for  an  actual  fixed  rate,   such
hypothetical  fixed rate as  would result under  (a) or (b)  if the actual fixed
rate were  replaced  by a  hypothetical  qualified floating  rate  or  qualified
inverse  floating rate such that the fair  market value of the Certificate as of
the issue date would be approximately the same as that of an otherwise identical
debt instrument providing  for the  hypothetical variable rate  rather than  the
actual  fixed rate. If the  interest paid or accrued  with respect to a Multiple
Variable Rate  Certificate during  an accrual  period differs  from the  assumed
fixed  interest  rate, such  difference will  be an  adjustment (to  interest or
original issue  discount,  as  applicable) to  the  Certificateholder's  taxable
income  for  the taxable  period or  periods to  which such  difference relates.
Additionally,  purchasers  of  such  Certificates  should  be  aware  that   the
provisions  of the OID Regulations applicable  to variable rate debt instruments
have been limited and  may not apply to  some REMIC Regular Certificates  having
variable  rates. If such a Certificate is  not governed by the provisions of the
OID Regulations applicable to variable rate debt instruments, it may be  subject
to  provisions of proposed Treasury Regulations applicable to instruments having
contingent payments. The application of those provisions to instruments such  as
variable   rate   REMIC   Regular   Certificates   is   subject   to   differing
interpretations.  Prospective  purchasers   of  variable   rate  REMIC   Regular
Certificates  are  advised  to consult  their  tax advisors  concerning  the tax
treatment of such Certificates.
 
   2. MARKET DISCOUNT AND PREMIUM
 
    A Certificateholder that purchases a  REMIC Regular Certificate at a  market
discount,  that is, at a  purchase price less than  the adjusted issue price (as
defined under  "--Taxation of  Owners  of REMIC  Regular  Certificates--Original
Issue  Discount")  of such  REMIC Regular  Certificate generally  will recognize
market discount upon receipt of  each distribution of principal. In  particular,
such  a holder will generally be required  to allocate each payment of principal
on a  REMIC  Regular  Certificate  first to  accrued  market  discount,  and  to
recognize  ordinary income to the extent  such principal payment does not exceed
the  aggregate  amount  of  accrued  market  discount  on  such  REMIC   Regular
Certificate  not previously  included in  income. Such  market discount  must be
included in income  in addition  to any  original issue  discount includible  in
income with respect to such REMIC Regular Certificate.
 
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<PAGE>
    A Certificateholder may elect to include market discount in income currently
as  it accrues, rather than including it  on a deferred basis in accordance with
the foregoing. If made,  such election will apply  to all market discount  bonds
acquired  by  such Certificateholder  on or  after  the first  day of  the first
taxable year to which  such election applies. In  addition, the OID  Regulations
permit  a Certificateholder to elect to accrue all interest, discount (including
DE MINIMIS market or original issue discount) and premium in income as interest,
based on a  constant yield method.  If such an  election were made  for a  REMIC
Regular  Certificate with market discount, the Certificateholder would be deemed
to have made  an election to  currently include market  discount in income  with
respect  to  all  other  debt  instruments  having  market  discount  that  such
Certificateholder acquires  during  the  year of  the  election  or  thereafter.
Similarly,  a Certificateholder that makes this  election for a Certificate that
is acquired at a  premium is deemed  to have made an  election to amortize  bond
premium,  as  described  below,  with respect  to  all  debt  instruments having
amortizable bond  premium  that such  Certificateholder  owns or  acquires.  The
election  to accrue  interest, discount and  premium on a  constant yield method
with respect to a Certificate is irrevocable.
 
    Under a statutory DE  MINIMIS exception, market discount  with respect to  a
REMIC  Regular Certificate will  be considered to  be zero for  purposes of Code
Sections 1276 through 1278  if such market  discount is less  than 0.25% of  the
stated redemption price at maturity of such REMIC Regular Certificate multiplied
by  the number  of complete years  to maturity  remaining after the  date of its
purchase. In interpreting  a similar DE  MINIMIS rule with  respect to  original
issue discount on obligations payable in installments, the OID Regulations refer
to  the weighted average maturity of obligations, and it is likely that the same
rule will be applied  in determining whether market  discount is DE MINIMIS.  It
appears  that DE MINIMIS market discount on a REMIC Regular Certificate would be
treated in a manner similar to original  issue discount of a DE MINIMIS  amount.
See   "Taxation  of  Holders  of   REMIC  Regular  Certificates--Original  Issue
Discount". Such treatment would result in discount being included in income at a
slower rate than  discount would  be required to  be included  using the  method
described  above. However, Treasury regulations implementing the market discount
DE MINIMIS exception have not been issued in proposed or temporary form, and the
precise treatment of DE MINIMIS market  discount on obligations payable in  more
than one installment therefore remains uncertain.
 
    The   1986  Act  grants  authority  to  the  Treasury  Department  to  issue
regulations providing for the method for accruing market discount of more than a
DE MINIMIS amount on debt instruments, the principal of which is payable in more
than one installment. Until such time as regulations are issued by the  Treasury
Department,  certain rules described  in the Committee  Report will apply. Under
those rules, the holder  of a bond  purchased with more  than DE MINIMIS  market
discount  may elect  to accrue  such market  discount either  on the  basis of a
constant yield method or  on the basis of  the appropriate proportionate  method
described  below.  Under the  proportionate method  for obligations  issued with
original issue discount,  the amount of  market discount that  accrues during  a
period  is equal  to the  product of  (i) the  total remaining  market discount,
multiplied by (ii)  a fraction,  the numerator of  which is  the original  issue
discount  accruing during the period  and the denominator of  which is the total
remaining original issue  discount at  the beginning  of the  period. Under  the
proportionate method for obligations issued without original issue discount, the
amount  of market discount that accrues during  a period is equal to the product
of (i) the total remaining market  discount, multiplied by (ii) a fraction,  the
numerator  of which  is the  amount of stated  interest paid  during the accrual
period and  the denominator  of which  is the  total amount  of stated  interest
remaining  to be paid at the beginning of the period. The Prepayment Assumption,
if any, used in calculating the accrual of original issue discount is to be used
in calculating the accrual  of market discount under  any of the above  methods.
Because  the regulations referred to in this  paragraph have not been issued, it
is not possible to predict  what effect such regulations  might have on the  tax
treatment  of  a  REMIC  Regular  Certificate purchased  at  a  discount  in the
secondary market.
 
    Further, a purchaser generally  will be required to  treat a portion of  any
gain  on sale or exchange  of a REMIC Regular  Certificate as ordinary income to
the extent of the market discount accrued  to the date of disposition under  one
of  the foregoing methods, less any  accrued market discount previously reported
as ordinary income. Such purchaser  also may be required  to defer a portion  of
its  interest deductions for  the taxable year  attributable to any indebtedness
incurred or continued to purchase or  carry such REMIC Regular Certificate.  Any
such    deferred   interest   expense    is,   in   general,    allowed   as   a
 
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<PAGE>
deduction not later than the year in which the related market discount income is
recognized. If such holder elects to include market discount in income currently
as it accrues on all market discount instruments acquired by such holder in that
taxable year or thereafter, the interest deferral rule described above will  not
apply.
 
    A  REMIC Regular Certificate purchased at  a cost (not including payment for
accrued qualified stated interest) greater than its remaining stated  redemption
price at maturity will be considered to be purchased at a premium. The holder of
such  a REMIC Regular Certificate  may elect to amortize  such premium under the
constant yield method.  The OID  Regulations also  permit Certificateholders  to
elect  to  include all  interest,  discount and  premium  in income  based  on a
constant yield method, further treating the Certificateholder as having made the
election to amortize premium generally, as discussed above. The Committee Report
indicates a Congressional intent that the same rules that will apply to  accrual
of market discount on installment obligations will also apply in amortizing bond
premium  under Code  Section 171  on installment  obligations such  as the REMIC
Regular Certificates.
 
   3. REALIZED LOSSES
 
    Under Code Section 166, both corporate holders of REMIC Regular Certificates
and noncorporate  holders  of  REMIC  Regular  Certificates  that  acquire  such
Certificates in connection with a trade or business should be allowed to deduct,
as  ordinary losses, any losses  sustained during a taxable  year in which their
Certificates become wholly  or partially worthless  as a result  of one or  more
realized  losses on the Mortgage Loans.  However, it appears that a noncorporate
holder that does not  acquire a REMIC Regular  Certificate in connection with  a
trade  or business will not be entitled to  deduct a loss under Code Section 166
until such  holder's  Certificate  becomes wholly  worthless  (I.E.,  until  its
outstanding  principal balance has been reduced to  zero) and that the loss will
be characterized as a short-term capital loss.
 
    Each holder  of a  REMIC  Regular Certificate  will  be required  to  accrue
interest  and original issue  discount with respect  to such Certificate without
regard  to  any   reduction  in  distributions   attributable  to  defaults   or
delinquencies  on the Mortgage  Loans or the  underlying assets until  it can be
established that any  such reduction ultimately  will not be  recoverable. As  a
result,  the amount of taxable income reported in  any period by the holder of a
REMIC Regular Certificate could  exceed the amount  of economic income  actually
realized  by the holder in  such period. Although the  holder of a REMIC Regular
Certificate eventually will recognize a loss or reduction in income attributable
to previously accrued and included income that, as a result of a realized  loss,
ultimately  will not be realized, the law  is unclear with respect to the timing
and character of such loss or reduction in income.
 
  D. TAXATION OF OWNERS OF REMIC RESIDUAL CERTIFICATES
 
   1. GENERAL
 
    An owner of a REMIC  Residual Certificate ("Residual Owner") generally  will
be required to report its daily portion of the taxable income or, subject to the
limitation   described  below  in  "--Taxation   of  Owners  of  REMIC  Residual
Certificates--Basis Rules and Distributions", the net loss of the REMIC Mortgage
Pool for each day during a calendar  quarter that the Residual Owner owned  such
REMIC  Residual  Certificate.  For  this  purpose,  the  daily  portion  will be
determined by allocating to each  day in the calendar  quarter, using a 30  days
per  month/90 days  per quarter/360  days per  year counting  convention (unless
otherwise disclosed  in  the  applicable  Prospectus  Supplement),  its  ratable
portion  of the taxable income  or net loss of the  REMIC Mortgage Pool for such
quarter, and by allocating the daily portions among the Residual Owners (on such
day) in accordance with their percentage of ownership interests on such day. Any
amount included in the gross income or  allowed as a loss of any Residual  Owner
by  virtue  of  this paragraph  will  be  treated as  ordinary  income  or loss.
Purchasers of REMIC Residual  Certificates should be  aware that taxable  income
from  such Certificates could  exceed cash distributions  thereon in any taxable
year. For example, if Mortgage Loans are acquired by a REMIC at a discount, then
the holder of  a residual  interest may recognize  income without  corresponding
cash   distributions.  This  result  could  occur  because  a  payment  produces
recognition of discount on the Mortgage Loan while the payment could be used  in
whole or in part to make principal payments on REMIC Regular Certificates issued
without  substantial discount.  Taxable income  may also  be greater  in earlier
years as a result of the fact that interest expense
 
                                       69
<PAGE>
deductions, expressed as a percentage of the outstanding principal amount of the
REMIC Regular  Certificates,  will increase  over  time as  the  lower  yielding
sequences  of Certificates are paid, whereas interest income with respect to any
given fixed rate Mortgage Loan will remain constant over time as a percentage of
the outstanding principal amount of that loan.
 
    Any payments  received  by a  holder  of  a REMIC  Residual  Certificate  in
connection  with the acquisition of such  Certificate will be taken into account
in determining  the income  of  such holder  for  federal income  tax  purposes.
Although  it appears likely that any such  payment would be includible in income
immediately upon its receipt, the IRS  might assert that such payment should  be
included  in income over time according to an amortization schedule or according
to some other  method. Because of  the uncertainty concerning  the treatment  of
such  payments, holders of REMIC Residual  Certificates should consult their tax
advisors concerning the treatment of such payments for income tax purposes.
 
   2. TAXABLE INCOME OR NET LOSS OF THE REMIC TRUST FUND
 
    The taxable income or  net loss of  the REMIC Mortgage  Pool will reflect  a
netting  of income  from the  Mortgage Loans,  any cancellation  of indebtedness
income due to the allocation of  Realized Losses to REMIC Regular  Certificates,
and  deductions  and losses  allowed to  the REMIC  Mortgage Pool.  Such taxable
income or net loss for a given  calendar quarter will be determined in the  same
manner  as for an  individual having the  calendar year as  his taxable year and
using the accrual method  of accounting, with  certain modifications. The  first
modification  is  that a  deduction  will be  allowed  for accruals  of interest
(including original issue discount) on  the REMIC Regular Certificates.  Second,
market  discount equal to the excess of any Mortgage Loan's adjusted issue price
(as determined under "Taxation of  Owners of REMIC Regular  Certificates--Market
Discount  and Premium") over its fair market value at the time of their transfer
to the REMIC Mortgage Pool generally will  be included in income as it  accrues,
based  on a constant yield  and on the Prepayment  Assumption. For this purpose,
the Company intends  to treat the  fair market  value of the  Mortgage Loans  as
being  equal to the aggregate issue prices of the REMIC Regular Certificates and
REMIC  Residual  Certificates;  if  one   or  more  classes  of  REMIC   Regular
Certificates or REMIC Residual Certificates are retained by the Company, it will
estimate  the value of  such retained interests  in order to  determine the fair
market value of the Mortgage Loans for  this purpose. Third, no item of  income,
gain, loss or deduction allocable to a prohibited transaction (see "--Prohibited
Transactions and Other Possible REMIC Taxes", below) will be taken into account.
Fourth, the REMIC Mortgage Pool generally may not deduct any item that would not
be  allowed in calculating the taxable income of a partnership by virtue of Code
Section 703(a)(2). Fifth, the REMIC  Regulations provide that the limitation  on
miscellaneous itemized deductions imposed on individuals by Code Section 67 will
not  be applied  at the Mortgage  Pool level to  the servicing fees  paid to the
Master Servicer  or sub-servicers,  if any.  (See, however,  "--Pass-Through  of
Servicing  Fees", below.) If  the deductions allowed to  the REMIC Mortgage Pool
exceed its gross income for a calendar quarter, such excess will be the net loss
for the REMIC Mortgage Pool for that calendar quarter.
 
   3. BASIS RULES AND DISTRIBUTIONS
 
    Any distribution by a REMIC  Mortgage Pool to a  Residual Owner will not  be
included  in the gross income  of such Residual Owner to  the extent it does not
exceed the adjusted basis of such Residual Owner's interest in a REMIC  Residual
Certificate.  Such distribution will reduce the adjusted basis of such interest,
but not below zero. To the extent  a distribution exceeds the adjusted basis  of
the  REMIC Residual Certificate, it will be treated as gain from the sale of the
REMIC Residual Certificate.  (See "--Sales of  REMIC Certificates", below.)  The
adjusted  basis of a REMIC Residual Certificate  is equal to the amount paid for
such REMIC Residual Certificate, increased by amounts included in the income  of
the   Residual   Owner   (See   "--Taxation   of   Owners   of   REMIC  Residual
Certificates--Daily Portions", above) and decreased by distributions and by  net
losses taken into account with respect to such interest.
 
    A  Residual Owner is not  allowed to take into account  any net loss for any
calendar quarter  to the  extent such  net loss  exceeds such  Residual  Owner's
adjusted  basis  in its  REMIC  Residual Certificate  as  of the  close  of such
calendar quarter  (determined  without  regard  to  such  net  loss).  Any  loss
 
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disallowed  by reason of this limitation  may be carried forward indefinitely to
future calendar quarters and, subject to  the same limitation, may be used  only
to offset income from the REMIC Residual Certificate.
 
    The  effect of these basis  and distribution rules is  that a Residual Owner
may not amortize its basis in a REMIC Residual Certificate, but may only recover
its basis through distributions, through the deduction of any net losses of  the
REMIC  Mortgage Pool  or upon  the sale of  its REMIC  Residual Certificate (See
"--Sales of  REMIC Certificates",  below). The  residual holder  does,  however,
receive  reduced taxable income over the life  of the REMIC, because the REMIC's
basis in the underlying  REMIC Mortgage Pool includes  the fair market value  of
the REMIC Regular Certificates and REMIC Residual Certificates.
 
   4. EXCESS INCLUSIONS
 
    Any  "excess inclusions"  with respect to  a REMIC  Residual Certificate are
subject to certain  special tax  rules. With respect  to a  Residual Owner,  the
excess  inclusion for any calendar quarter is  defined as the excess (if any) of
the daily portions of taxable  income over the sum  of the "daily accruals"  for
each  day during such quarter  that such REMIC Residual  Certificate was held by
such Residual Owner. The daily accruals are determined by allocating to each day
during a calendar quarter  its ratable portion of  the product of the  "adjusted
issue  price" of the REMIC Residual Certificate at the beginning of the calendar
quarter and 120 percent of  the long-term "applicable federal rate"  (generally,
an average of current yields on Treasury securities of comparable maturity) (the
"AFR")  in effect at the time of issuance of the REMIC Residual Certificate. For
this purpose, the adjusted issue price of a REMIC Residual Certificate as of the
beginning of  any calendar  quarter is  the issue  price of  the REMIC  Residual
Certificate,  increased by the  amount of daily accruals  for all prior quarters
and decreased by  any distributions  made with  respect to  such REMIC  Residual
Certificate  before the beginning  of such quarter.  The issue price  of a REMIC
Residual Certificate is the initial offering price to the public (excluding bond
houses and  brokers)  at  which  a substantial  amount  of  the  REMIC  Residual
Certificates were sold.
 
    For  Residual  Owners,  other  than thrift  institutions  described  in Code
Section 593, an excess inclusion cannot be offset by deductions, losses or  loss
carryovers from other activities. For Residual Owners that are subject to tax on
unrelated  business taxable income  (as defined in Code  Section 511), an excess
inclusion of  such  Residual Owner  is  treated as  unrelated  business  taxable
income.  For Residual Owners  that are nonresident  alien individuals or foreign
corporations generally subject  to United  States 30% withholding  tax, even  if
interest  paid to such Residual Owners is generally eligible for exemptions from
such tax, an excess inclusion will be subject to such tax and no tax treaty rate
reduction or  exemption may  be  claimed with  respect thereto.  See  "--Foreign
Investors in REMIC Certificates".
 
    Provisions  enacted by the "Technical and Miscellaneous Revenue Act of 1988"
(the "1988 Act")  cause the  above-described exception  for thrift  institutions
generally  to apply only to those residual interests held and deductions, losses
and loss carryovers  incurred directly by  such institutions (and  not by  other
members  of an affiliated group of corporations filing a consolidated income tax
return) or certain wholly owned direct subsidiaries of such institutions  formed
and  operated exclusively in  connection with the  organization and operation of
one or  more REMICs.  The  REMIC Regulations  further  limit this  exception  to
residual  interests  having "significant  value". In  order to  have significant
value, the REMIC Residual  Certificates must have an  aggregate issue price,  at
issuance,  at least equal to two percent of the aggregate issue prices of all of
the  related  REMIC  Regular  and   Residual  Certificates.  In  addition,   the
anticipated  weighted average life of the REMIC Residual Certificates must equal
or exceed 20  percent of  the anticipated weighted  average life  of the  REMIC,
based  on the Prepayment  Assumption and on  any required or  permitted clean up
calls or  required  liquidation  provided  for  in  the  REMIC's  organizational
documents. Although it has not done so, the Treasury also has authority to issue
regulations  that, if REMIC Residual Certificates are found in the aggregate not
to have "significant value",  would treat as excess  inclusions with respect  to
such  REMIC Residual Certificates the entire daily portion of taxable income for
such REMIC Residual Certificates. Each  Prospectus Supplement pursuant to  which
REMIC  Residual Certificates are offered will  state whether such REMIC Residual
Certificates will have, or may be regarded as having, "significant value"  under
the   REMIC  Regulations;  provided,   however,  that  any   disclosure  that  a
 
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REMIC Residual  Certificate will  have "significant  value" will  be based  upon
certain  assumptions, and the  Company will make no  representation that a REMIC
Residual Certificate will  have "significant  value" for purposes  of the  above
described  rules or that a Residual  Owner will receive distributions of amounts
calculated pursuant to those assumptions.
 
    In the  case  of any  REMIC  Residual Certificates  held  by a  real  estate
investment  trust, the  aggregate excess inclusions  with respect  to such REMIC
Residual  Certificates,  reduced  (but  not  below  zero)  by  the  real  estate
investment  trust taxable income (within the  meaning of Code Section 857(b)(2),
excluding any net  capital gain), will  be allocated among  the shareholders  of
such  trust in  proportion to the  dividends received by  such shareholders from
such trust, and any amount so allocated  will be treated as an excess  inclusion
with  respect  to a  REMIC  Residual Certificate  as  if held  directly  by such
shareholder.
 
   5. NONECONOMIC REMIC RESIDUAL CERTIFICATES
 
    Under the  REMIC  Regulations,  transfers of  "noneconomic"  REMIC  Residual
Certificates  will  be disregarded  for all  federal income  tax purposes  if "a
significant purpose of the transfer was  to enable the transferor to impede  the
assessment or collection of tax". If such transfer is disregarded, the purported
transferor  will continue to remain liable for any taxes due with respect to the
income on such "noneconomic" REMIC  Residual Certificate. The REMIC  Regulations
provide  that  a REMIC  Residual Certificate  will  be considered  a noneconomic
residual interest  unless,  at  the  time  of its  transfer  and  based  on  the
Prepayment  Assumption and any required or  permitted clean up calls or required
liquidation provided  for  in  the REMIC's  organizational  documents,  (1)  the
present value of the expected future distributions (discounted using the AFR) on
the REMIC Residual Certificate equals at least the present value of the expected
tax  on the  anticipated excess  inclusions, and  (2) the  transferor reasonably
expects that the transferee will receive distributions with respect to the REMIC
Residual Certificate at or  after the time the  taxes accrue on the  anticipated
excess  inclusions  in  an  amount  sufficient  to  satisfy  the  accrued taxes.
Accordingly, all transfers  of REMIC Residual  Certificates that may  constitute
noneconomic residual interests will be subject to certain restrictions under the
terms of the related Pooling and Servicing Agreement that are intended to reduce
the  possibility of any such transfer  being disregarded. Such restrictions will
require each party to a transfer to provide an affidavit that no purpose of such
transfer is to  impede the assessment  or collection of  tax, including  certain
representations  as to  the financial  condition of  the prospective transferee.
Prior to purchasing a REMIC Residual Certificate, prospective purchasers  should
consider  the  possibility  that a  purported  transfer of  such  REMIC Residual
Certificate by such a purchaser to another purchaser at some future date may  be
disregarded  in accordance with the above-described rules, which would result in
the retention  of tax  liability by  such purchaser.  The applicable  Prospectus
Supplement  will  disclose whether  offered REMIC  Residual Certificates  may be
considered  "noneconomic"  residual  interests  under  the  REMIC   Regulations;
provided, however, that any disclosure that a REMIC Residual Certificate will or
will not be considered "noneconomic" will be based upon certain assumptions, and
the  Company will make no representation  that a REMIC Residual Certificate will
not be considered  "noneconomic" for  purposes of the  above-described rules  or
that  a REMIC Residual  Owner will receive  distributions calculated pursuant to
such assumptions.  See  "Foreign  Investors in  REMIC  Certificates"  below  for
additional  restrictions  applicable  to  transfers  of  certain  REMIC Residual
Certificates to foreign persons.
 
   6. TAX-EXEMPT INVESTORS
 
    Generally, tax exempt organizations that  are not subject to Federal  income
taxation on "unrelated business taxable income" pursuant to Code Section 511 are
treated  as "disqualified organizations" under provisions of the 1988 Act. Under
provisions of the Pooling Agreement, such organizations generally are prohibited
from owning Residual Certificates. For Residual  Owners that are subject to  tax
on unrelated business taxable income (as defined in Code Section 511), an excess
inclusion  of  such  Residual Owner  is  treated as  unrelated  business taxable
income. See "--Sales of REMIC Certificates".
 
   7. REAL ESTATE INVESTMENT TRUSTS
 
    If the applicable  Prospectus Supplement  so provides, a  Mortgage Pool  may
hold  Mortgage Loans  bearing interest  based wholly  or partially  on Mortgagor
profits, Mortgaged Property appreciation, or
 
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similar contingencies.  Such  interest, if  earned  directly by  a  real  estate
investment  trust ("REIT"), would be subject to the limitations of Code sections
856 (f) and 856 (j). Treasury Regulations treat a REIT holding a REMIC  Residual
Certificate  for  a  principal  purpose  of  avoiding  such  Code  provisions as
receiving directly  the income  of the  REMIC Mortgage  Pool, hence  potentially
jeopardizing  its qualification for taxation as  a REIT and exposing such income
to taxation as a prohibited transaction at a 100 percent rate.
 
   8. MARK-TO-MARKET RULES
 
    On  December  28,  1993,  the   IRS  released  temporary  regulations   (the
"Mark-to-Market  Regulations")  relating to  the  requirement that  a securities
dealer mark to market securities held for sale to customers. This mark-to-market
requirement applies to all  securities owned by a  dealer, except to the  extent
that  the dealer has specifically identified  a security as held for investment.
The Mark-to-Market Regulations provide that for purposes of this  mark-to-market
requirement,  a "negative value" REMIC Residual  Certificate is not treated as a
security and thus generally may not be marked to market. This exclusion from the
mark-to-market  requirement   is  expanded   to  include   all  REMIC   Residual
Certificates under proposed Treasury regulations published January 4, 1995 which
provide  that any REMIC  Residual Certificate issued after  January 4, 1995 will
not be  treated as  a security  and therefore  generally may  not be  marked  to
market.  Prospective purchasers of  a REMIC Residual  Certificate should consult
their tax  advisors regarding  the possible  application of  the  mark-to-market
requirement to REMIC Residual Certificates.
 
  E. SALES OF REMIC CERTIFICATES
 
    If a REMIC Certificate is sold, the seller will recognize gain or loss equal
to the difference between the amount realized on the sale and its adjusted basis
in  the REMIC  Certificate. The  adjusted basis  of a  REMIC Regular Certificate
generally will equal the cost of  such REMIC Regular Certificate to the  seller,
increased  by any  original issue  discount or  market discount  included in the
seller's gross income with respect to such REMIC Regular Certificate and reduced
by premium amortization deductions and distributions previously received by  the
seller  of amounts included in  the stated redemption price  at maturity of such
REMIC Regular Certificate. The  adjusted basis of  a REMIC Residual  Certificate
will  be determined as  described under "--Taxation of  Owners of REMIC Residual
Certificates--Basis Rules and Distributions",  above. Gain from the  disposition
of a REMIC Regular Certificate that might otherwise be treated as a capital gain
will  be treated as ordinary income to the extent that such gain does not exceed
the excess, if any, of  (i) the amount that would  have been includible in  such
holder's  income had income accrued at a rate equal to 110% of the AFR as of the
date of  purchase over  (ii) the  amount actually  includible in  such  holder's
income.  Except  as  otherwise provided  under  "--Taxation of  Owners  of REMIC
Regular Certificates--Market  Discount  and  Premium"  and  under  Code  Section
582(c),  any additional  gain or  any loss on  the sale  or exchange  of a REMIC
Certificate will be  capital gain or  loss, provided such  REMIC Certificate  is
held  as a  capital asset (generally,  property held for  investment) within the
meaning of Code Section 1221. The Code currently provides for a top marginal tax
rate on ordinary  income of 39.6%  for individuals while  maintaining a  maximum
marginal rate for the long-term capital gains of individuals at 28%. There is no
such  rate differential for corporations. In addition, the distinction between a
capital gain or  loss and  ordinary income or  loss remains  relevant for  other
purposes,  including limitations on the use of capital losses to offset ordinary
income.
 
    A portion of  any gain from  the sale  of a REMIC  Regular Certificate  that
might  otherwise be capital gain may be treated as ordinary income to the extent
that such Certificate is held as  part of a "conversion transaction" within  the
meaning of Code Section 1258. A conversion transaction generally is one in which
the taxpayer has taken two or more positions in Certificates or similar property
that  reduce or  eliminate market risk,  if substantially all  of the taxpayer's
return is attributable  to the time  value of the  taxpayer's net investment  in
such  transaction. The  amount of gain  so realized in  a conversion transaction
that is recharacterized as ordinary income generally will not exceed the  amount
of  interest that would have accrued on the taxpayer's net investment at 120% of
the AFR at the time the taxpayer enters into the conversion transaction, subject
to appropriate  reduction for  prior inclusion  of interest  and other  ordinary
income items from the transaction.
 
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    A taxpayer may elect to have net capital gain taxed at ordinary income rates
rather  than capital gains  rates in order  to include such  net capital gain in
total net  investment  income  for  that  taxable  year,  for  purposes  of  the
limitation  on the deduction of interest on indebtedness incurred to purchase or
carry property held for investment to a taxpayer's net investment income.
 
    The recently enacted Omnibus Budget Reconciliation Act of 1993 (the  "Budget
Act")  revised the  rules for  deducting interest  on indebtedness  allocable to
property held  for  investment.  Generally, deductions  for  such  interest  are
limited  to a taxpayer's net investment income for each taxable year. As amended
by the Budget  Act, net  investment income for  each taxable  year includes  net
capital  gain attributable to the disposition of investment property only if the
taxpayer elects to  have such net  capital gain taxed  at ordinary income  rates
rather than capital gains rates.
 
    If  a Residual Owner sells a REMIC  Residual Certificate at a loss, the loss
will not be recognized  if, within six  months before or after  the sale of  the
REMIC  Residual  Certificate,  such Residual  Owner  purchases  another residual
interest in any REMIC or any interest in a taxable mortgage pool (as defined  in
Code  Section  7701(i))  comparable to  a  residual  interest in  a  REMIC. Such
disallowed loss will be allowed upon the sale of the other residual interest (or
comparable interest) if the rule referred to in the preceding sentence does  not
apply  to that  sale. While the  Committee Report  states that this  rule may be
modified by  Treasury regulations,  the REMIC  Regulations do  not address  this
issue  and  it  is not  clear  whether any  such  modification will  in  fact be
implemented or, if implemented, what the precise nature or effective date of  it
would be.
 
    The 1988 Act makes transfers of a residual interest to certain "disqualified
organizations" subject to an additional tax on the transferor in an amount equal
to  the maximum  corporate tax rate  applied to  the present value  of the total
anticipated excess  inclusions (discounted  using the  applicable Federal  rate)
with  respect to such residual interest for  the periods after the transfer. For
this purpose, "disqualified organizations" includes the United States, any state
or political subdivision  of a  state, any foreign  government or  international
organization  or  any agency  or instrumentality  of any  of the  foregoing; any
tax-exempt entity  (other than  a Code  Section 521  cooperative) which  is  not
subject  to the tax on  unrelated business income; and  any rural electrical and
telephone cooperative. The anticipated excess  inclusions must be determined  as
of the date that the REMIC Residual Certificate is transferred and must be based
on  events that have  occurred up to  the time of  such transfer, the Prepayment
Assumption, and any required or permitted clean up calls or required liquidation
provided for  in the  REMIC's  organizational documents.  The tax  generally  is
imposed  on the transferor of the REMIC  Residual Certificate, except that it is
imposed on  an agent  for a  disqualified organization  if the  transfer  occurs
through  such  agent.  The  Pooling  and  Servicing  Agreement  requires,  as  a
prerequisite to any  transfer of  a Residual  Certificate, the  delivery to  the
Trustee  of  an affidavit  of the  transferee to  the  effect that  it is  not a
disqualified organization and contains other  provisions designed to render  any
attempted  transfer  of a  Residual Certificate  to a  disqualified organization
void.
 
    In addition, if a "pass-through entity" includes in income excess inclusions
with respect to a REMIC Residual Certificate, and a disqualified organization is
the record holder of an interest in such  entity, then a tax will be imposed  on
such  entity equal to the product of (i)  the amount of excess inclusions on the
REMIC  Residual  Certificate  that  are   allocable  to  the  interest  in   the
pass-through  entity held by such disqualified organization and (ii) the highest
marginal federal income tax rate imposed on corporations. A pass-through  entity
will not be subject to this tax for any period, however, if the record holder of
an  interest in such  entity furnishes to  such entity (i)  such holder's social
security number and  a statement  under penalties  of perjury  that such  social
security  number  is  that  of  the record  holder  or  (ii)  a  statement under
penalities  of  perjury  that   such  record  holder   is  not  a   disqualified
organization.  For these purposes,  a "pass-through entity"  means any regulated
investment company, real estate investment trust, trust, partnership or  certain
other  entities  described in  Section 860E(e)(6)  of the  Code. In  addition, a
person holding an  interest in a  pass-through entity as  a nominee for  another
person  shall,  with respect  to  such interest,  be  treated as  a pass-through
entity. Legislation presently pending before the United States Congress, the Tax
Simplification and  Technical  Corrections  Bill of  1993  (the  "Simplification
Act"),  would  apply  this  tax  on an  annual  basis  to  "large partnerships".
Generally, the Simplification Act  would treat partnerships  that have, or  have
had,  250  or  more  partners  as a  large  partnership  for  this  purpose. The
 
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Simplification Act would not limit application  of the tax to excess  inclusions
allocable  to disqualified  organizations, and  in fact  would apply  the tax to
large partnerships having no disqualified organizations as partners. If  enacted
in  its present form, the Simplification  Act would apply to partnership taxable
years ending on or after December 31, 1994.
 
  F. PASS-THROUGH OF SERVICING FEES
 
    The general  rule  is that  Residual  Certificateholders take  into  account
taxable  income or net loss of the related REMIC Mortgage Pool. Under that rule,
servicing compensation of  the Company and  the subservicers (if  any) would  be
allocated to the holders of the REMIC Residual Certificates, and therefore would
not  affect the income  or deductions of holders  of REMIC Regular Certificates.
However, in the case of a "single-class REMIC", such expenses and an  equivalent
amount  of additional gross income will be  allocated among all holders of REMIC
Regular Certificates  and  REMIC  Residual  Certificates  for  purposes  of  the
limitations on the deductibility of certain miscellaneous itemized deductions by
individuals contained in Code Sections 56(b)(1) and 67. Generally, any holder of
a REMIC Certificate who is an individual, estate or trust will be able to deduct
such  expenses in determining regular tax liability only to the extent that such
expenses together with certain other  miscellaneous itemized deductions of  such
individual,  estate or trust exceed  2% of adjusted gross  income; such a holder
may not  deduct  such  expenses  to any  extent  in  determining  liability  for
alternative  minimum tax.  Accordingly, REMIC  Residual Certificates,  and REMIC
Regular Certificates receiving an allocation of servicing compensation, may  not
be  appropriate investments for individuals, estates or trusts, and such persons
should carefully consult with their own tax advisors regarding the  advisability
of an investment in such Certificates.
 
    A  "single-class REMIC"  is a REMIC  that either  (i) would be  treated as a
pass-through  trust  under  the   provisions  of  Treasury  Regulation   Section
301.7701-4(c)  in  the absence  of a  REMIC election,  or (ii)  is substantially
similar to  such a  pass-through  trust and  is  structured with  the  principal
purpose  of avoiding the  allocation of investment expenses  to holders of REMIC
Regular  Certificates.  Unless  otherwise  stated  in  the  related   Prospectus
Supplement,  the Company intends to treat a  REMIC Mortgage Pool as other than a
"single-class REMIC",  consequently allocating  servicing compensation  expenses
and  related income  amounts entirely to  REMIC Residual Certificates  and in no
part to REMIC Regular Certificates.
 
  G. PROHIBITED TRANSACTIONS AND OTHER POSSIBLE REMIC TAXES
 
    The Code imposes a tax on REMIC  Mortgage Pools equal to 100 percent of  the
net  income  derived from  "prohibited transactions".  In general,  a prohibited
transaction means the  disposition of  a Mortgage  Loan other  than pursuant  to
certain  specified exceptions, the receipt of income  from a source other than a
Mortgage  Loan  or   certain  other  permitted   investments,  the  receipt   of
compensation  for services, or  gain from the disposition  of an asset purchased
with the  payments  on  the  Mortgage Loans  for  temporary  investment  pending
distribution  on the REMIC Certificates. The Code also imposes a 100 percent tax
on the value of any contribution of assets to the REMIC after the "start-up day"
(the day on  which the regular  and residual interests  are issued), other  than
pursuant  to  specified exceptions,  and subjects  "net income  from foreclosure
property" to tax at  the highest corporate  rate. It is  not anticipated that  a
REMIC  Mortgage Pool will  engage in any  such transactions or  receive any such
income.
 
  H. TERMINATION OF A REMIC TRUST FUND
 
    In general, no special tax  consequences will apply to  a holder of a  REMIC
Regular Certificate upon the termination of the REMIC Mortgage Pool by virtue of
the  final payment  or liquidation  of the last  Mortgage Loan  remaining in the
REMIC Mortgage Pool. If a Residual Owner's adjusted basis in its REMIC  Residual
Certificate  at  the time  such termination  occurs exceeds  the amount  of cash
distributed to  such  Residual  Owner  in liquidation  of  its  interest,  then,
although  the  matter is  not  entirely free  from  doubt, it  appears  that the
Residual Owner would be entitled to a loss (which would be a capital loss) equal
to the amount of such excess.
 
  I. REPORTING AND OTHER ADMINISTRATIVE MATTERS OF REMICS
 
    Reporting of interest  income, including any  original issue discount,  with
respect  to REMIC Regular Certificates is required annually, and may be required
more frequently under Treasury
 
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regulations. In addition to those holders of REMIC Regular Certificates to  whom
information  reporting  generally  applies,  certain  holders  of  REMIC Regular
Certificates who  are  generally  exempt  from  information  reporting  on  debt
instruments,   such   as   corporations,   banks,   registered   securities   or
commodities  brokers,  real  estate  investment  trusts,  registered  investment
companies,   common  trust  funds,  charitable   remainder  annuity  trusts  and
unitrusts,  will  be  provided  interest  and  original  issue  discount  income
information  and  the  information set  forth  in the  following  paragraph upon
request in accordance  with the  requirements of the  Treasury regulations.  The
information  must be  provided by  the later  of 30  days after  the end  of the
quarter for which the information was requested, or two weeks after the  receipt
of  the request. The REMIC  Mortgage Pool must also  comply with rules requiring
the face of a  REMIC Certificate issued  at more than a  DE MINIMIS discount  to
disclose  the amount of original issue discount and the issue date and requiring
such information to be reported to the Treasury Department.
 
    The REMIC Regular Certificate information  reports must include a  statement
of  the "adjusted issue price" of the REMIC Regular Certificate at the beginning
of each  accrual  period. In  addition,  the reports  must  include  information
necessary  to compute  the accrual  of any market  discount that  may arise upon
secondary trading of  REMIC Regular Certificates.  Because exact computation  of
the  accrual  of  market  discount  on a  constant  yield  method  would require
information relating to  the holder's  purchase price which  the REMIC  Mortgage
Pool  may not have, it appears that this provision will only require information
pertaining to the appropriate proportionate method of accruing market discount.
 
    The responsibility for complying with the foregoing reporting rules will  be
borne by the Company.
 
    For  purposes of the  administrative provisions of  the Code, REMIC Mortgage
Pools will be treated as partnerships  and the holders of Residual  Certificates
will  be  treated  as  partners.  Unless  otherwise  stated  in  the  applicable
Prospectus Supplement,  the Company  will file  federal income  tax  information
returns  on behalf of the related REMIC Mortgage Pool, and will be designated as
agent for, and will act  on behalf of the "tax  matters person" with respect  to
the REMIC Mortgage Pool in all respects.
 
    As  agent for the tax  matters person, the Company  will, subject to certain
notice requirements and various restrictions and limitations, generally have the
authority to act on behalf  of the REMIC and  the Residual Owners in  connection
with  the administrative and judicial review of items of income, deduction, gain
or loss  of the  REMIC  Mortgage Pool,  as well  as  the REMIC  Mortgage  Pool's
classification.  Residual Owners will generally be required to report such REMIC
Mortgage Pool  items consistently  with their  treatment on  the REMIC  Mortgage
Pool's  federal income tax  information return and may  in some circumstances be
bound by a settlement  agreement between the Master  Servicer, as agent for  the
tax  matters person, and the  IRS concerning any such  REMIC Mortgage Pool item.
Adjustments made to the  REMIC Mortgage Pool tax  return may require a  Residual
Owner to make corresponding adjustments on its return, and an audit of the REMIC
Mortgage  Pool's tax  return, or the  adjustments resulting from  such an audit,
could result in an audit of a Residual Owner's return.
 
  J. BACKUP WITHHOLDING WITH RESPECT TO REMIC CERTIFICATES
 
    Payments of interest and principal on REMIC Regular Certificates, as well as
payments of proceeds from the sale of REMIC Certificates, may be subject to  the
"backup  withholding tax" under Section 3406 of the Code at a rate of 31 percent
if recipients of such payments fail to furnish to the payor certain information,
including their taxpayer identification numbers, or otherwise fail to  establish
an   exemption  from  such  tax.  Any  amounts  deducted  and  withheld  from  a
distribution  to  a  recipient  would  be  allowed  as  a  credit  against  such
recipient's federal income tax. Furthermore, certain penalties may be imposed by
the  IRS on a recipient  of payments that is  required to supply information but
that does not do so in the proper manner.
 
  K. FOREIGN INVESTORS IN REMIC CERTIFICATES
 
   1. REMIC REGULAR CERTIFICATES
 
    Except as qualified below, payments made on a REMIC Regular Certificate to a
REMIC Regular  Certificateholder  that is  not  a U.S.  Person,  as  hereinafter
defined (a "Non-U.S. Person"), or to a
 
                                       76
<PAGE>
person  acting on behalf  of such a Certificateholder,  generally will be exempt
from U.S. federal income and withholding  taxes, provided (a) the holder of  the
Certificate is not subject to U.S. tax as a result of a connection to the United
States  other  than  ownership  of  such Certificate,  (b)  the  holder  of such
Certificate signs a  statement under  penalties of perjury  that certifies  that
such  holder is  a Non-U.S. Person,  and provides  the name and  address of such
holder, and (c)  the last  U.S. Person  in the chain  of payment  to the  holder
received  such statement from such holder  or a financial institution holding on
its behalf and does not have actual  knowledge that such statement is false.  If
the  holder does not qualify for exemption, distributions of interest, including
distributions in respect of accrued original issue discount, to such holder  may
be  subject to a withholding tax rate  of 30 percent, subject to reduction under
any applicable tax treaty.
 
    "U.S.  Person"  means  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 that is subject to U.S. federal income tax regardless of the source of its
income.
 
    Holders  of REMIC  Regular Certificates should  be aware that  the IRS might
take the position that exemption from  U.S. withholding taxes does not apply  to
such  a holder that also  directly or indirectly owns 10  percent or more of the
REMIC Residual Certificates of a particular Series of Certificates. Further, the
foregoing rules  will not  apply to  exempt  a United  States shareholder  of  a
controlled foreign corporation from taxation on such United States shareholder's
allocable  portion of the  interest or original issue  discount income earned by
such controlled foreign corporation.
 
   2. REMIC RESIDUAL CERTIFICATES
 
    Amounts paid to a Residual Owner that is a Non-U.S. Person generally will be
treated as interest  for purposes of  applying the withholding  tax on  Non-U.S.
Persons with respect to income on its REMIC Residual Certificate. However, it is
unclear  whether distributions on  REMIC Residual Certificates  will be eligible
for the general  exemption from withholding  tax that applies  to REMIC  Regular
Certificates as described above. Treasury regulations provide that, for purposes
of  the portfolio interest exception,  payments to the foreign  owner of a REMIC
Residual Certificate are to  be considered paid on  the obligations held by  the
REMIC,  rather than  on the  Certificate itself.  Such payments  would thus only
qualify for the portfolio interest exception if the underlying obligations  held
by  the REMIC would so qualify. Such  withholding tax generally would be imposed
at a rate of 30 percent but would  be subject to reduction under any tax  treaty
applicable   to  the  Residual  Owner.  However,  there  is  no  exemption  from
withholding tax nor may the rate of such  tax be reduced, under a tax treaty  or
otherwise,  with  respect  to  any  distribution of  income  that  is  an excess
inclusion. See  "--Taxation of  Owners  of REMIC  Residual  Certificates--Excess
Inclusions".
 
    Certain restrictions relating to transfers of REMIC Residual Certificates to
and  by  investors  who are  not  U.S. Persons  are  also imposed  by  the REMIC
Regulations. First, transfers of REMIC Residual Certificates to Non-U.S. Persons
that have "tax avoidance potential" are  disregarded for all federal income  tax
purposes.  If such transfer  is disregarded, the purported  transferor of such a
REMIC Residual Certificate to a Non-U.S. Person would continue to remain  liable
for any taxes due with respect to the income on such REMIC Residual Certificate.
A  REMIC Residual Certificate has tax avoidance potential unless, at the time of
the transfer, the transferor reasonably  expects that the REMIC will  distribute
to  the transferee amounts  that will equal  at least 30  percent of each excess
inclusion, and that such  amounts will be  distributed at or  after the time  at
which  the excess inclusion accrues and not later than the close of the calendar
year following  the  calendar year  of  accrual. This  rule  does not  apply  to
transfers  if the  income from  the REMIC Residual  Certificate is  taxed in the
hands of the transferee  as income effectively connected  with the conduct of  a
U.S.  trade or business. Second, if a Non-U.S. Person transfers a REMIC Residual
Certificate to a U.S. Person,  and the transfer has  the effect of allowing  the
transferor  to  avoid  tax  on  accrued  excess  inclusions,  that  transfer  is
disregarded for  all federal  income  tax purposes  and the  purported  Non-U.S.
Person  transferor continues to  be treated as  the owner of  the REMIC Residual
Certificate. Thus, the REMIC's liability to  withhold 30 percent of the  accrued
excess  inclusions is not terminated even  though the REMIC Residual Certificate
is no longer held by a Non-U.S. Person.
 
                                       77
<PAGE>
  L. STATE AND LOCAL TAXATION
 
    Many states do not  automatically conform to changes  in the federal  income
tax laws. Consequently, a REMIC Mortgage Pool which would not qualify as a fixed
investment  trust  for federal  income tax  purposes may  be characterized  as a
corporation, a partnership, or  some other entity for  purposes of state  income
tax  law. Such characterization could result in entity level income or franchise
taxation of a REMIC Mortgage Pool formed in, owning mortgages or property in, or
having  servicing  activity  performed  in  a  state  without  conforming  REMIC
provisions   in  its  income  or  franchise  tax  law.  Further,  REMIC  Regular
Certificateholders resident in nonconforming states may have their ownership  of
REMIC  Regular Certificates characterized as an  interest other than debt of the
REMIC such as stock or a partnership interest. Investors are advised to  consult
their  tax advisors  concerning the state  and local income  tax consequences of
their purchase and ownership of REMIC Regular Certificates.
 
                            METHODS OF DISTRIBUTION
 
    Certificates are being  offered hereby  in Series  from time  to time  (each
Series  evidencing  a  separate  Mortgage Pool)  through  any  of  the following
methods:
 
        1.  By negotiated firm commitment underwriting and public reoffering  by
    underwriters;
 
        2.   By agency placements through one or more placement agents primarily
    with institutional investors and dealers; and
 
        3.  By placement directly by the Company with institutional investors.
 
    A Prospectus Supplement will be prepared for each Series which will describe
the method  of offering  being  used for  that Series  and  will set  forth  the
identity  of any underwriters thereof and either  the price at which such Series
is being  offered,  the nature  and  amount  of any  underwriting  discounts  or
additional compensation to such underwriters and the proceeds of the offering to
the  Company, or the  method by which  the price at  which the underwriters will
sell the  Certificates will  be determined.  Each Prospectus  Supplement for  an
underwritten  offering will also contain information regarding the nature of the
underwriters' obligations, any material relationship between the Company and any
underwriter and,  where  appropriate,  information regarding  any  discounts  or
concessions to be allowed or reallowed to dealers or others and any arrangements
to  stabilize the  market for  the Certificates  so offered.  In firm commitment
underwritten offerings, the underwriters  will be obligated  to purchase all  of
the  Certificates  of  such  Series  if  any  such  Certificates  are purchased.
Certificates may be acquired by the underwriters for their own accounts and  may
be  resold from time to  time in one or  more transactions, including negotiated
transactions, at a fixed public offering  price or at varying prices  determined
at the time of sale.
 
    Underwriters  and agents may be entitled  under agreements entered into with
the Company to indemnification by the Company against certain civil liabilities,
including liabilities under the Securities Act of 1933, as amended (the  "Act"),
or  to contribution with  respect to payments which  such underwriters or agents
may be required to make in respect thereof.
 
    If a  Series is  offered  other than  through underwriters,  the  Prospectus
Supplement  relating thereto  will contain  information regarding  the nature of
such offering and  any agreements  to be entered  into between  the Company  and
purchasers of Certificates of such Series.
 
                        TRANSFERABILITY OF CERTIFICATES
 
    The  Company anticipates  that the  Certificates will  be sold  primarily to
institutional investors.  Purchasers of  Certificates, including  dealers,  may,
depending  on the  facts and  circumstances of such  purchases, be  deemed to be
"underwriters" within the meaning  of the Act, in  connection with reoffers  and
sales  by them of Certificates. Certain purchasers  will be required to give the
Company prior notice  of their intention  to resell their  Certificates, and  to
represent  to the Company that they will observe certain prospectus delivery and
anti-manipulative requirements of  the Act  and the Securities  Exchange Act  of
1934,  as  amended. The  Company  will charge  any  Certificateholder requesting
amended or updated Prospectuses or Prospectus Supplements all expenses  incurred
by   the   Company   for   preparation   and   delivery   of   such   documents.
Certificateholders should consult with their legal advisors in this regard prior
to any such reoffer or resale.
 
                                       78
<PAGE>
                                 LEGAL MATTERS
 
    Certain legal  matters will  be passed  upon for  the Company  by Thomas  G.
Lehmann,  General Counsel, Vice  President and Secretary of  the Company, and by
its special counsel, Orrick, Herrington & Sutcliffe, San Francisco, California.
 
                             FINANCIAL INFORMATION
 
    The Company has determined that its financial statements are not material to
the offering  made hereby.  However,  any prospective  investor who  desires  to
review  financial  information concerning  the  Company will  be  provided, upon
request, with a  copy of the  consolidated balance  sheet of the  Company as  of
December  31, 1994 or the end of its last fiscal year, whichever is later, and a
copy of the  most recent  statement of earnings  of the  Company. Such  requests
should be directed to PNC Mortgage Securities Corp., Controller's Department, 75
North Fairway Drive, Vernon Hills, Illinois 60061.
 
                             ADDITIONAL INFORMATION
 
    This  Prospectus, together with the Prospectus Supplement for each Series of
Certificates, contains  a  summary  of  the material  terms  of  the  applicable
exhibits  to the Registration Statement and the documents referred to herein and
therein. Copies of such exhibits  are on file at  the offices of the  Securities
and Exchange Commission in Washington, D.C., may be obtained at rates prescribed
by  the Commission upon request to the  Commission and may be inspected, without
charge, at the Commission's offices.
 
                                       79
<PAGE>
                                    GLOSSARY
 
    Set  forth below is a list of certain  of the more significant terms used in
this Prospectus and  the pages on  which the  definitions of such  terms may  be
found.
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Act............................................          66
Advance Claims Endorsement.....................          39
Advances.......................................          11
AFR............................................          59
Agency Certificates............................           6
Bankruptcy Bond................................           6
Bankruptcy Instrument..........................          38
Bankruptcy Loss................................          37
Basic Prepayment Assumption....................          15
BPA............................................          15
Buydown Fund...................................          10
Buydown Loans..................................           5
CERCLA.........................................          48
Certificate Account............................          24
Certificate Administrator......................           4
Certificate Administrator Fee..................          11
Certificates...................................           1
Class..........................................           1
Code...........................................          33
Commission.....................................          11
Company........................................           1
Compensating Interest..........................          14
Conversion Fee.................................          12
Cooperative....................................          10
Cooperative Loan...............................           1
Cooperative Note...............................          10
Curtailment....................................          14
Custodial Account for P&I......................          22
Cut-Off Date...................................           7
Defaulted Mortgage Loss........................          37
Determination Date.............................          26
Distribution Date..............................           4
Distribution Period............................          25
DOL............................................          49
Eligible Investments...........................          24
ERISA..........................................           7
Extraordinary Losses...........................          38
FDIC...........................................          15
FHA............................................          10
FHA Approved Mortgagees........................          15
FHA Insurance Policies.........................          10
FHLMC..........................................           6
FHLMC Approved Mortgagees......................          15
FNMA...........................................           6
FNMA Approved Mortgagees.......................          15
Fraud Bond.....................................           5
Fraud Instrument...............................          38
Fraud Loss.....................................          37
Garn-St. Germain Act...........................          47
GNMA...........................................           6
Indemnified Parties............................          31
Insurance Proceeds.............................          22
Investment Account.............................          23
Investment Period..............................          23
IRS............................................          53
Lenders........................................          15
Letter of Credit...............................           6
Letter of Credit Bank..........................          42
 
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Liquidation Proceeds...........................          22
Loss...........................................          34
Master Servicer................................           4
Master Servicing Fee...........................          11
Mortgaged Properties...........................           9
Mortgage Loans.................................           1
Mortgage Notes.................................           9
Mortgage Pool..................................           1
Mortgage Pool Insurance Policy.................           5
Mortgages......................................           9
Mortgagor......................................           6
Net Rate.......................................          21
1988 Act.......................................          59
Non-U.S. Person................................          64
OID Regulations................................          51
Parties in Interest............................          49
Paying Agent...................................          18
Payoff.........................................          14
Plans..........................................          49
Pooling Agreement..............................          11
Prepayment Assumption..........................          53
Primary Insurance Policy.......................           5
Principal Prepayment...........................          15
Private Certificates...........................           6
PTCE 83-1......................................          49
Record Date....................................          19
Regulation.....................................          49
Relief Act.....................................          47
REMIC..........................................           1
REMIC Certificates.............................          51
REMIC Mortgage Pool............................          51
REMIC Provisions...............................          51
REMIC Regulations..............................          51
Remittance Rate................................           1
Reserve Account................................          40
Reserve Fund...................................           6
Residual Owner.................................          58
Retained Yield.................................          22
Sellers........................................           4
Seller/Servicers...............................           4
Selling and Servicing Contracts................          18
Senior Certificates............................          39
Series.........................................           1
Servicer.......................................           4
Servicing Contracts............................          11
Servicing Fee..................................          11
Special Hazard Instrument......................          38
Special Hazard Insurance Policy................           6
Special Hazard Loss............................          37
Title V........................................          47
Title VIII.....................................          48
Trustee........................................          11
Trust Fund.....................................           1
UCC............................................          55
VA.............................................          10
VA Guaranties..................................          10
VA Loans.......................................          10
Withdrawal Date................................          23
</TABLE>
 
                                       80
<PAGE>
 
                                             -----------------------------------
 
                                             -----------------------------------
 
                                                     PNC MORTGAGE
                                                   SECURITIES CORP.
                                                 DEPOSITOR AND MASTER SERVICER
 
                                                          MORTGAGE
                                                  PASS-THROUGH CERTIFICATES
                                                        SERIES 1996-4
 
                                                        $145,240,138
                                                         (APPROXIMATE)
 
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                                                     PROSPECTUS SUPPLEMENT
 
               -----------------------------------------------------------------
 
                                                DONALDSON, LUFKIN & JENRETTE
                                                    SECURITIES CORPORATION
 
                                                       DECEMBER 23, 1996
 
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