NORWEST ASSET SECURITIES CORP
424B5, 1996-10-29
ASSET-BACKED SECURITIES
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<PAGE>
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED OCTOBER 24, 1996)
                                                                          [LOGO]
                           $149,180,900 (APPROXIMATE)
                      NORWEST ASSET SECURITIES CORPORATION
                                   ("NASCOR")
 
                                     SELLER
 
               MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1996-7
      PRINCIPAL AND INTEREST PAYABLE MONTHLY, COMMENCING IN NOVEMBER 1996
 
    The Series 1996-7 Mortgage Pass-Through Certificates (the "Series 1996-7
Certificates") will consist of one class of senior certificates (the "Class A
Certificates") and two classes of subordinated certificates (the "Class M
Certificates" and the "Class B Certificates," respectively, and together, the
"Subordinated Certificates"). The Class A Certificates are entitled to a certain
priority, relative to the Class M and Class B Certificates, in right of
distributions on the Mortgage Loans. As between the Class M Certificates and the
Class B Certificates, the Class M Certificates are entitled to a certain
priority in right of distributions on the Mortgage Loans. The Class A
Certificates will consist of ten subclasses of Certificates designated as the
Class A-1, Class A-2, Class A-3, Class A-4, Class A-5, Class A-6, Class A-7,
Class A-PO, Class A-R and Class A-LR Certificates. The Class M Certificates will
not be divided into subclasses. The Class B Certificates will consist of five
subclasses of Certificates designated as the Class B-1, Class B-2, Class B-3,
Class B-4 and Class B-5 Certificates. Each subclass of Class A and Class B
Certificates is referred to herein as a "Subclass." The Class A Certificates,
the Class M Certificates and the Class B-1 and Class B-2 Certificates are the
only Series 1996-7 Certificates being offered hereby and are referred to herein
collectively as the "Offered Certificates." The Class B-1 and Class B-2
Certificates are referred to herein collectively as the "Offered Class B
Certificates."
                                                        (CONTINUED ON NEXT PAGE)
                          ---------------------------
 
THESE SECURITIES DO NOT REPRESENT INTERESTS IN OR OBLIGATIONS OF NORWEST ASSET
 SECURITIES CORPORATION OR ANY AFFILIATE THEREOF. NEITHER THESE SECURITIES NOR
 THE UNDERLYING MORTGAGE LOANS WILL BE INSURED OR GUARANTEED BY ANY
                    GOVERNMENTAL AGENCY OR INSTRUMENTALITY.
                            ------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
 AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
  ACCURACY OR ADEQUACY OF THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                  INITIAL SUBCLASS OR
  SUBCLASS OR            CLASS
     CLASS             PRINCIPAL         PASS-THROUGH
  DESIGNATION         BALANCE (1)            RATE
<S>               <C>                   <C>
Class A-1.......      $ 18,550,000             7.50%
Class A-2.......      $ 54,098,328             7.00%
Class A-3.......      $ 22,519,572             7.50%
Class A-4.......      $ 15,198,000             7.50%
Class A-5.......      $  1,950,000             7.50%
Class A-6.......      $ 30,000,000             7.50%
Class A-7.......          (2)                  9.00    %
</TABLE>
 
<TABLE>
<CAPTION>
                                             INITIAL SUBCLASS OR
               SUBCLASS OR                          CLASS             PASS-THROUGH
            CLASS DESIGNATION                PRINCIPAL BALANCE(1)         RATE
<S>                                         <C>                     <C>
Class A-PO................................       $  2,355,900                (3)
Class A-R.................................       $         50               7.50%
Class A-LR................................       $         50               7.50%
Class M...................................       $  2,255,000               7.50%
Class B-1.................................       $  1,503,000               7.50%
Class B-2.................................       $    751,000               7.50%
</TABLE>
 
(1) APPROXIMATE. THE INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCES ARE SUBJECT TO
    ADJUSTMENT AS DESCRIBED HEREIN.
 
(2) THE CLASS A-7 CERTIFICATE IS AN INTEREST-ONLY CERTIFICATE, HAS NO PRINCIPAL
    BALANCE AND WILL BEAR INTEREST ON THE CLASS A-7 NOTIONAL AMOUNT (INITIALLY,
    APPROXIMATELY $3,005,463) AS DESCRIBED HEREIN UNDER "DESCRIPTION OF THE
    CERTIFICATES--INTEREST".
 
(3) THE CLASS A-PO CERTIFICATES ARE PRINCIPAL-ONLY CERTIFICATES AND WILL NOT BE
    ENTITLED TO DISTRIBUTIONS IN RESPECT OF INTEREST.
 
    PROSPECTIVE INVESTORS IN THE OFFERED CERTIFICATES SHOULD CONSIDER THE
FACTORS DISCUSSED UNDER "RISK FACTORS" IN THIS PROSPECTUS SUPPLEMENT ON PAGE
S-29 AND IN THE PROSPECTUS ON PAGE 13.
                              -------------------
 
    The Offered Certificates will be purchased by Donaldson, Lufkin & Jenrette
Securities Corporation (the "Underwriter") from the Seller and will be offered
by the Underwriter from time to time in negotiated transactions or otherwise at
varying prices to be determined at the time of sale. The aggregate proceeds to
the Seller are expected to be approximately 99.7175% of the aggregate initial
principal balance of the Class A Certificates (other than the Class A-PO
Certificates), approximately 67.5625% of the aggregate initial principal balance
of the Class A-PO Certificates, approximately 99.0372% of the aggregate initial
principal balance of the Class M Certificates, approximately 98.2352% of the
aggregate initial principal balance of the Class B-1 Certificates and
approximately 95.8868% of the aggregate initial principal balance of the Class
B-2 Certificates, plus, in each case, accrued interest thereon at the rate of
7.50% per annum, other than on an amount equal to the aggregate initial
principal balance of the Class A-PO Certificates, from October 1, 1996 to (but
not including) October 29, 1996, before deducting expenses payable by the Seller
estimated to be $255,000. The price to be paid to the Seller for the Subclasses
of Class A Certificates (other than the Class A-PO Certficiates) has not been
allocated among such Subclasses. See "Underwriting" herein.
 
    The Offered Certificates are offered by the Underwriter subject to prior
sale, when, as and if accepted by the Underwriter and subject to approval of
certain legal matters by Brown & Wood LLP, counsel for the Underwriter. It is
expected that delivery of the Offered Certificates will be made on or about
October 29, 1996 through the facilities of The Depository Trust Company, or in
the case of the Class A-7, Class A-PO, Class A-R, Class A-LR, Class M and
Offered Class B Certificates, at the office of Donaldson, Lufkin & Jenrette
Securities Corporation, New York, N.Y. against payment therefor in immediately
available funds.
                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION
 
          THE DATE OF THIS PROSPECTUS SUPPLEMENT IS OCTOBER 24, 1996.
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    The credit enhancement for the Series 1996-7 Certificates is provided
through the use of a "shifting interest" type subordination, which has the
effect of allocating all or a disproportionate amount of principal prepayments
and other unscheduled receipts of principal to the Class A Certificates (other
than the Class A-PO Certificates) in the aggregate for at least nine years
beginning on the first Distribution Date. See "Summary Information -- Credit
Enhancement " and "-- Effects of Prepayments on Investment Expectations,"
"Description of the Certificates" and "Prepayment and Yield Considerations"
herein.
 
    The Series 1996-7 Certificates will evidence in the aggregate the entire
beneficial ownership interest in a trust fund (the "Trust Estate") established
by Norwest Asset Securities Corporation (the "Seller" or "NASCOR") and
consisting of a pool of fixed interest rate, conventional, monthly pay, fully
amortizing, one- to four-family, residential first mortgage loans having
original terms to stated maturity ranging from approximately 10 to approximately
15 years (the "Mortgage Loans"), other than the Fixed Retained Yield described
herein, together with certain related property. Certain of the Mortgage Loans
may be secured primarily by shares issued by cooperative housing corporations.
The servicing of the Mortgage Loans will be performed by various servicers
identified herein (each, a "Servicer"), including Norwest Mortgage, an affiliate
of both the Seller and Norwest Bank Minnesota, National Association ("Norwest
Bank"), and will be supervised by Norwest Bank (in such capacity, the "Master
Servicer"). The Mortgage Loans will be acquired by the Seller on the date of
issuance of the Series 1996-7 Certificates from Norwest Mortgage, and will have
been originated by Norwest Mortgage or acquired by Norwest Mortgage from various
other entities (each such other entity, a "Norwest Mortgage Correspondent"). The
Mortgage Loans not originated by Norwest Mortgage were originated by the Norwest
Mortgage Correspondents or acquired by the Norwest Mortgage Correspondents
pursuant to mortgage loan purchase programs operated by such Norwest Mortgage
Correspondents. See "Description of the Mortgage Loans" herein. The Class A
Certificates will initially evidence in the aggregate an approximate 96.25%
undivided interest in the principal balance of the Mortgage Loans. The Class M
Certificates will initially evidence in the aggregate an approximate 1.50%
undivided interest in the principal balance of the Mortgage Loans. The Class B-1
Certificates will initially evidence in the aggregate an approximate 1.00%
undivided interest in the principal balance of the Mortgage Loans. The Class B-2
Certificates will initially evidence in the aggregate an approximate 0.50%
undivided interest in the principal balance of the Mortgage Loans. The remaining
approximate 0.75% undivided interest in the principal balance of the Mortgage
Loans will be evidenced by the Class B-3, Class B-4 and Class B-5 Certificates.
 
    Distributions in respect of interest and principal will be made on the 25th
day of each month or, if such day is not a business day, on the succeeding
business day (each a "Distribution Date"), commencing in November 1996, to the
holders of Offered Certificates, as described herein. The amount of interest
accrued on any Subclass or Class of Offered Certificates (other than the Class
A-PO Certificates) will be reduced by certain prepayment interest shortfalls and
certain other shortfalls in the collection of interest from mortgagors, as well
as certain losses, as described herein under "Description of the Certificates --
Interest." The Class A-PO Certificates are principal-only certificates and will
not be entitled to distributions of interest. On any Distribution Date, the
holders of the Class M Certificates will receive distributions of interest only
if the holders of the Class A Certificates have received all amounts due them
(other than the Class A-PO Deferred Amount) on such date. Distributions of
principal to holders of the Class M Certificates will be made only after the
holders of the Class A Certificates have received all distributions to which
they are entitled (including, in the case of the Class A-PO Certificates, the
Class A-PO Deferred Amount) and the holders of the Class M Certificates have
received the amount of interest due them with respect to such Distribution Date.
On any Distribution Date, the holders of a Subclass of Class B Certificates will
receive distributions of interest only if the holders of the Class A
Certificates and the Class M Certificates and each Subclass of Class B
Certificates with a lower numerical designation have received all amounts of
interest and of principal (other than the Class A-PO Deferred Amount) to which
they are entitled on such date. Distributions of principal to holders of a
Subclass of Class B Certificates will be made only after the holders of the
Class A Certificates, the Class M Certificates and each Subclass of Class B
Certificates with a lower numerical designation have received all distributions
to which they are entitled (including in the case of the Class A-PO
Certificates, the Class A-PO Deferred Amount) and such Subclass of Class B
Certificates has received the amount of interest due with respect to such
Distribution Date. Distributions in reduction of the principal balance of the
Class A Certificates on any Distribution Date will be allocated among the
Subclasses of the Class A Certificates in the manner
 
                                      S-2
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
described herein under "Description of the Certificates -- Principal (Including
Prepayments)." Distributions to each Subclass or undivided Class of Offered
Certificates will be made pro rata among Certificateholders of such Subclass or
Class.
 
    The Offered Certificates may not be an appropriate investment for individual
investors who do not have sufficient resources or expertise to evaluate the
particular characteristics of the applicable Subclass or Class of Offered
Certificates. This may be the case because:
 
    - The yield to maturity of Offered Certificates purchased at a price other
      than par will be sensitive to the uncertain rate and timing of principal
      prepayments on the Mortgage Loans;
 
    - The rate of principal distributions on, and the weighted average life of,
      the Offered Certificates will be sensitive to the uncertain rate and
      timing of principal prepayments on the Mortgage Loans, and as such the
      Offered Certificates may be inappropriate investments for an investor
      requiring a distribution of a particular amount of principal on a specific
      date or an otherwise predictable stream of distributions;
 
    - There can be no assurance that an investor will be able to reinvest
      amounts distributed in respect of principal on an Offered Certificate
      (which, in general, are expected to be greater during periods of
      relatively low interest rates) at a rate at least as high as the
      Pass-Through Rate applicable thereto;
 
    - As discussed below, there can be no assurance that a secondary market for
      the Offered Certificates will develop or provide Certificateholders with
      liquidity of investment; and
 
    - The Offered Certificates are subject to the further risks and other
      special considerations discussed herein and in the Prospectus under the
      heading "Risk Factors."
 
    THE YIELD TO MATURITY OF THE OFFERED CERTIFICATES WILL BE SENSITIVE IN
VARYING DEGREES TO THE RATE AND TIMING OF PRINCIPAL PAYMENTS (INCLUDING
PREPAYMENTS, WHICH MAY BE MADE AT ANY TIME WITHOUT PENALTY) ON THE MORTGAGE
LOANS. INVESTORS IN THE OFFERED CERTIFICATES SHOULD CONSIDER THE ASSOCIATED
RISKS, INCLUDING, IN THE CASE OF OFFERED CERTIFICATES PURCHASED AT A DISCOUNT,
PARTICULARLY THE CLASS A-PO CERTIFICATES, THE RISK THAT A SLOWER THAN
ANTICIPATED RATE OF PAYMENTS IN RESPECT OF PRINCIPAL (INCLUDING PREPAYMENTS) ON
THE MORTGAGE LOANS, OR IN THE CASE OF THE CLASS A-PO CERTIFICATES, ON THE
DISCOUNT MORTGAGE LOANS, COULD RESULT IN AN ACTUAL YIELD THAT IS LOWER THAN
ANTICIPATED AND, IN THE CASE OF THE OFFERED CERTIFICATES PURCHASED AT A PREMIUM,
OR IN THE CASE OF THE CLASS A-7 CERTIFICATE, WHICH HAS NO PRINCIPAL BALANCE,
THAT A FASTER THAN ANTICIPATED RATE OF PAYMENTS IN RESPECT OF PRINCIPAL
(INCLUDING PREPAYMENTS) ON THE MORTGAGE LOANS COULD RESULT IN AN ACTUAL YIELD
THAT IS LOWER THAN ANTICIPATED FOR INVESTORS PURCHASING OFFERED CERTIFICATES AT
A PREMIUM. INVESTORS PURCHASING OFFERED CERTIFICATES AT A PREMIUM, OR AN
INVESTOR IN THE CLASS A-7 CERTIFICATE, SHOULD ALSO CONSIDER THE RISK THAT A
RAPID RATE OF PAYMENTS IN RESPECT OF PRINCIPAL (INCLUDING PREPAYMENTS) ON THE
MORTGAGE LOANS COULD RESULT IN THE FAILURE OF SUCH INVESTORS TO FULLY RECOVER
THEIR INITIAL INVESTMENTS. THE YIELD TO INVESTORS IN THE CLASS A-PO CERTIFICATES
WILL BE SENSITIVE TO THE RATE OF PRINCIPAL PAYMENTS OF THOSE MORTGAGE LOANS WITH
NET MORTGAGE INTEREST RATES LESS THAN 7.50% (THE "DISCOUNT MORTGAGE LOANS"). THE
YIELD TO MATURITY OF THE CLASS M CERTIFICATES WILL BE MORE SENSITIVE THAN THAT
OF THE CLASS A CERTIFICATES TO THE AMOUNT AND TIMING OF LOSSES DUE TO
LIQUIDATIONS OF THE MORTGAGE LOANS IN THE EVENT THAT THE CLASS B PRINCIPAL
BALANCE HAS BEEN REDUCED TO ZERO. THE YIELD TO MATURITY OF EACH SUBCLASS OF
OFFERED CLASS B CERTIFICATES WILL BE MORE SENSITIVE THAN THAT OF THE CLASS A
CERTIFICATES, THE CLASS M CERTIFICATES AND, IN THE CASE OF THE CLASS B-2
CERTIFICATES, THE CLASS B-1 CERTIFICATES, TO THE AMOUNT AND TIMING OF LOSSES DUE
TO LIQUIDATIONS OF THE MORTGAGE LOANS IN THE EVENT THAT THE PRINCIPAL BALANCES
OF THE SUBCLASSES OF CLASS B CERTIFICATES WITH HIGHER NUMERICAL DESIGNATIONS
HAVE BEEN REDUCED TO ZERO. SEE "DESCRIPTION OF THE CERTIFICATES -- INTEREST,"
"-- PRINCIPAL (INCLUDING PREPAYMENTS)" AND "-- SUBORDINATION OF CLASS M AND
CLASS B CERTIFICATES" HEREIN AND "PREPAYMENT AND YIELD CONSIDERATIONS" HEREIN
AND IN THE PROSPECTUS.
 
    The Offered Certificates, other than the Class A-7, Class A-PO, Class A-R,
Class A-LR, Class M and Offered Class B Certificates, will be issued only in
book-entry form (the "Book-Entry Certificates"), and purchasers thereof will not
be entitled to receive definitive certificates except in the limited
circumstances set forth herein. The Book-Entry Certificates will be registered
in the name of Cede & Co., as nominee of The Depository Trust Company, which
will be the "holder" or "Certificateholder" of such Certificates, as such terms
are used herein. See "Description of the Certificates" herein.
 
                                      S-3
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    Each Subclass and Class of Offered Certificates is offered in the minimum
denominations described herein under "Summary Information -- Forms of
Certificates; Denominations." It is intended that the Offered Certificates not
be directly or indirectly held or beneficially owned in amounts lower than such
minimum denominations.
 
    There is currently no secondary market for the Offered Certificates and
there can be no assurance that a secondary market will develop or, if such a
market does develop, that it will provide Certificateholders with liquidity of
investment at any particular time or for the life of the Offered Certificates.
The Underwriter intends to act as a market maker in the Offered Certificates,
subject to applicable provisions of federal and state securities laws and other
regulatory requirements, but is under no obligation to do so and any such market
making may be discontinued at any time. There can be no assurance that any
investor will be able to sell an Offered Certificate at a price equal to or
greater than the price at which such Certificate was purchased. THE CLASS M AND
OFFERED CLASS B CERTIFICATES MAY NOT BE TRANSFERRED UNLESS THE TRANSFEREE HAS
DELIVERED (I) A REPRESENTATION LETTER TO THE TRUSTEE AND THE SELLER STATING
EITHER (A) THAT THE TRANSFEREE IS NOT A PLAN AND IS NOT ACTING ON BEHALF OF A
PLAN OR USING THE ASSETS OF A PLAN TO EFFECT SUCH PURCHASE OR (B) SUBJECT TO
CERTAIN CONDITIONS DESCRIBED HEREIN, THAT THE SOURCE OF FUNDS USED TO PURCHASE
THE CLASS M OR OFFERED CLASS B CERTIFICATES IS AN "INSURANCE COMPANY GENERAL
ACCOUNT" OR (II) AN OPINION OF COUNSEL AS PROVIDED IN THIS PROSPECTUS
SUPPLEMENT. IN ADDITION, THE CLASS A-R AND CLASS A-LR CERTIFICATES MAY NOT BE
PURCHASED BY OR TRANSFERRED TO (I) A "DISQUALIFIED ORGANIZATION," (II) EXCEPT
UNDER CERTAIN LIMITED CIRCUMSTANCES, A PERSON WHO IS NOT A "U.S. PERSON," (III)
A PLAN OR (IV) ANY PERSON OR ENTITY WHO THE TRANSFEROR KNOWS OR HAS REASON TO
KNOW WILL BE UNWILLING OR UNABLE TO PAY WHEN DUE FEDERAL, STATE OR LOCAL TAXES
WITH RESPECT THERETO. See "ERISA Considerations" and "Description of the
Certificates -- Restrictions on Transfer of the Class A-R, Class A-LR, Class M
and Offered Class B Certificates" herein and "Certain Federal Income Tax
Consequences -- Federal Income Tax Consequences for REMIC
Certificates -- Tax-Related Restrictions on Transfer of Residual Certificates"
in the Prospectus.
 
    Elections will be made to treat the Trust Estate as two separate real estate
mortgage investment conduits (each, a "REMIC" or, in the alternative, the
"Upper-Tier REMIC" and the "Lower-Tier REMIC," respectively) for federal income
tax purposes. As described more fully herein and in the Prospectus, the Class
A-1, Class A-2, Class A-3, Class A-4, Class A-5, Class A-6, Class A-7 and Class
A-PO Certificates, the Class M Certificates and the Class B-1, Class B-2, Class
B-3, Class B-4 and Class B-5 Certificates will constitute "regular interests" in
the Upper-Tier REMIC and the Class A-R and Class A-LR Certificates will
constitute the "residual interests" in the Upper-Tier REMIC and the Lower-Tier
REMIC, respectively. PROSPECTIVE INVESTORS ARE CAUTIONED THAT THE CLASS A-R AND
CLASS A-LR CERTIFICATEHOLDERS' REMIC TAXABLE INCOME AND THE TAX LIABILITY
THEREON MAY EXCEED, AND MAY SUBSTANTIALLY EXCEED, CASH DISTRIBUTIONS TO SUCH
HOLDERS DURING CERTAIN PERIODS, IN WHICH EVENT SUCH HOLDERS MUST HAVE SUFFICIENT
ALTERNATIVE SOURCES OF FUNDS TO PAY SUCH TAX LIABILITY. See "Summary
Information -- Federal Income Tax Status" and "Federal Income Tax
Considerations" herein and "Certain Federal Income Tax Consequences -- Federal
Income Tax Consequences for REMIC Certificates" in the Prospectus.
 
    The Class A Certificates represent ten Subclasses of a Class, the Class M
Certificates represent a Class and the Offered Class B Certificates represent
two Subclasses of a Class, all of which are part of a separate Series of
Certificates being offered by the Seller pursuant to the Prospectus dated
October 24, 1996 accompanying this Prospectus Supplement. Any prospective
investor should not purchase any Offered Certificates described herein unless it
shall have received the Prospectus and this Prospectus Supplement. The
Prospectus shall not be considered complete without this Prospectus Supplement.
The Prospectus contains important information regarding this offering which is
not contained herein, and prospective investors are urged to read, in full, the
Prospectus and this Prospectus Supplement.
                             ---------------------
 
    UNTIL JANUARY 27, 1997, ALL DEALERS EFFECTING TRANSACTIONS IN THE OFFERED
CERTIFICATES, WHETHER OR NOT PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED
TO DELIVER A PROSPECTUS SUPPLEMENT AND PROSPECTUS. THIS IS IN ADDITION TO THE
OBLIGATION OF DEALERS TO DELIVER A PROSPECTUS SUPPLEMENT AND PROSPECTUS WHEN
ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR
SUBSCRIPTIONS.
 
                                      S-4
<PAGE>
                               TABLE OF CONTENTS
                             PROSPECTUS SUPPLEMENT
<TABLE>
<CAPTION>
                                                  PAGE
                                                ---------
<S>                                             <C>
 
SUMMARY INFORMATION...........................        S-6
RISK FACTORS..................................       S-29
  General.....................................       S-29
  Subordination...............................       S-29
  Book-Entry System for Certain Subclasses of
   Class A Certificates.......................       S-29
DESCRIPTION OF THE CERTIFICATES...............       S-30
  Denominations...............................       S-30
  Definitive Form.............................       S-30
  Book-Entry Form.............................       S-30
  Distributions...............................       S-30
  Interest....................................       S-34
  Principal (Including Prepayments)...........       S-39
    Calculation of Amount to be Distributed to
     the Class A Certificates (other than the
     Class A-PO Certificates).................       S-39
    Calculation of Amount to be Distributed to
     the Class A-PO Certificates..............       S-42
    Calculation of Amount to be Distributed to
     the Class M and Class B Certificates.....       S-43
    Allocation of Amount to be Distributed....       S-47
  Additional Rights of the Class A-R and Class
   A-LR Certificateholders....................       S-48
  Periodic Advances...........................       S-49
  Restrictions on Transfer of the Class A-R,
   Class A-LR, Class M and Offered Class B
   Certificates...............................       S-49
  Reports.....................................       S-50
  Subordination of Class M and Class B
   Certificates...............................       S-51
    Allocation of Losses......................       S-52
DESCRIPTION OF THE MORTGAGE LOANS.............       S-56
  General.....................................       S-56
  Mortgage Loan Data..........................       S-59
  Mandatory Repurchase or Substitution of
   Mortgage Loans.............................       S-61
  Optional Repurchase of Defaulted Mortgage
   Loans......................................       S-61
 
<CAPTION>
                                                  PAGE
                                                ---------
<S>                                             <C>
 
DELINQUENCY AND FORECLOSURE EXPERIENCE........       S-61
PREPAYMENT AND YIELD CONSIDERATIONS...........       S-66
  Sensitivity of the Class A-7 Certificates...       S-72
  Sensitivity of the Class A-PO
   Certificates...............................       S-73
  Historic Loss Experience of Securitized
   Mortgage Loans.............................       S-74
  Yield Considerations with Respect to the
   Class B-1 and Class B-2 Certificates.......       S-75
POOLING AND SERVICING AGREEMENT...............       S-78
  General.....................................       S-78
  Distributions...............................       S-78
  Voting......................................       S-78
  Trustee.....................................       S-79
  Trust Administrator.........................       S-79
  Master Servicer.............................       S-79
  Special Servicing Agreements................       S-79
  Optional Termination........................       S-80
SERVICING OF THE MORTGAGE LOANS...............       S-80
  The Servicers...............................       S-81
  Servicer Custodial Accounts.................       S-81
  Unscheduled Principal Receipts..............       S-82
  Anticipated Changes in Servicing............       S-82
  Fixed Retained Yield; Servicing Compensation
   and Payment of Expenses....................       S-83
  Servicer Defaults...........................       S-84
FEDERAL INCOME TAX CONSIDERATIONS.............       S-85
  Regular Certificates........................       S-85
  Residual Certificates.......................       S-86
ERISA CONSIDERATIONS..........................       S-87
LEGAL INVESTMENT..............................       S-88
SECONDARY MARKET..............................       S-89
UNDERWRITING..................................       S-90
LEGAL MATTERS.................................       S-90
USE OF PROCEEDS...............................       S-90
RATINGS.......................................       S-90
INDEX OF SIGNIFICANT PROSPECTUS SUPPLEMENT
 DEFINITIONS..................................       S-92
</TABLE>
 
                                      S-5
<PAGE>
                              SUMMARY INFORMATION
 
    THE FOLLOWING IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE DETAILED
INFORMATION APPEARING ELSEWHERE IN THIS PROSPECTUS SUPPLEMENT AND IN THE
ACCOMPANYING PROSPECTUS (THE "PROSPECTUS"). CAPITALIZED TERMS USED IN THIS
PROSPECTUS SUPPLEMENT AND NOT OTHERWISE DEFINED HEREIN HAVE THE MEANINGS
ASSIGNED IN THE PROSPECTUS. SEE "INDEX OF SIGNIFICANT PROSPECTUS SUPPLEMENT
DEFINITIONS" HEREIN AND "INDEX OF SIGNIFICANT DEFINITIONS" IN THE PROSPECTUS.
 
<TABLE>
<S>                               <C>
Title of Securities.............  Mortgage Pass-Through Certificates, Series 1996-7 (the
                                  "Series 1996-7 Certificates" or the "Certificates").
Seller..........................  Norwest Asset Securities Corporation (the "Seller"). The
                                  Mortgage Loans will have been acquired by the Seller from
                                  Norwest Mortgage, Inc. ("Norwest Mortgage"), an affiliate
                                  of the Seller and the Master Servicer. The Mortgage Loans
                                  that the Seller acquires from Norwest Mortgage will either
                                  have been originated by Norwest Mortgage or acquired by
                                  Norwest Mortgage, or an affiliate of Norwest Mortgage,
                                  from various other entities (each other such entity, a
                                  "Norwest Mortgage Correspondent"), which either originated
                                  the Mortgage Loans or acquired the Mortgage Loans pursuant
                                  to mortgage loan purchase programs operated by the Norwest
                                  Mortgage Correspondents. None of the Norwest Mortgage
                                  Correspondents is an affiliate of Norwest Mortgage.
Servicing/Servicers.............  Norwest Mortgage and one or more other Servicers (which
                                  will be Norwest Mortgage Correspondents) approved by the
                                  Master Servicer will provide customary servicing functions
                                  with respect to the Mortgage Loans pursuant to servicing
                                  agreements (each, an "Underlying Servicing Agreement")
                                  assigned to the Trust Estate. Among other things, the
                                  Servicers are obligated under certain circumstances to
                                  advance delinquent payments of principal and interest with
                                  respect to the Mortgage Loans. Each of the Servicers will
                                  be entitled to (i) a monthly Servicing Fee with respect to
                                  each Mortgage Loan it services payable on each Distri-
                                  bution Date that is expressed as one-twelfth of 0.25%
                                  multiplied by the scheduled principal balance of such
                                  Mortgage Loan on the first day of the preceding month and
                                  (ii) other additional servicing compensation described
                                  herein. See "Servicing of the Mortgage Loans" herein and
                                  in the Prospectus.
Master Servicer.................  Norwest Bank Minnesota, National Association ("Norwest
                                  Bank" and, in its capacity as master servicer, the "Master
                                  Servicer"). Norwest Bank is a direct, wholly owned
                                  subsidiary of Norwest Corporation and is an affiliate of
                                  the Seller and Norwest Mortgage. The Master Servicer will
                                  (a) monitor certain aspects of the servicing of the
                                  Mortgage Loans, (b) cause the Mortgage Loans to be
                                  serviced in the event that a Servicer is terminated and a
                                  successor Servicer is not appointed, (c) provide
                                  administrative services with respect to the Certificates,
                                  (d) provide certain reports to the Trustee regarding the
                                  Mortgage Loans and the Certificates, (e) make advances, to
                                  the extent described herein, with respect to the Mortgage
                                  Loans if a Servicer (other than Norwest Mortgage) fails to
                                  make a required advance and (f) make payments to cover
                                  certain prepayment interest shortfalls. The Master
                                  Servicer will be entitled to (i) a
</TABLE>
 
                                      S-6
<PAGE>
 
<TABLE>
<S>                               <C>
                                  monthly Master Servicing Fee with respect to each Mortgage
                                  Loan, payable on each Distribution Date, in an amount
                                  equal to one-twelfth of 0.02% multiplied by the scheduled
                                  principal balance of such Mortgage Loan on the first day
                                  of the preceding month and (ii) any interest earned on
                                  funds in the Certificate Account. See "Description of the
                                  Certificates -- Interest" and "The Pooling and Servicing
                                  Agreement -- Master Servicer" herein and "Norwest Bank,"
                                  "Servicing of the Mortgage Loans -- The Master Servicer"
                                  and "Certain Matters Regarding the Master Servicer" in the
                                  Prospectus.
Trustee.........................  Firstar Trust Company, a banking corporation organized
                                  under the laws of Wisconsin (the "Trustee"). See "Pooling
                                  and Servicing Agreement -- Trustee" in this Prospectus
                                  Supplement.
Trust Administrator.............  First Union National Bank of North Carolina (the "Trust
                                  Administrator"). The Trust Administrator will perform
                                  certain administrative functions on behalf of the Trustee
                                  and will act as the initial paying agent, certificate
                                  registrar and custodian. The Trust Administrator will be
                                  required to make advances, to the extent described herein,
                                  with respect to the Mortgage Loans if Norwest Mortgage, as
                                  Servicer, fails to make a required advance. See "Pooling
                                  and Servicing Agreement -- Trust Administrator" in this
                                  Prospectus Supplement.
Rating of Certificates..........  It is a condition to the issuance of the Class A
                                  Certificates that they shall have been rated "AAA" by
                                  Fitch Investors Service, L.P. ("Fitch"). It is a condition
                                  to the issuance of the Class A Certificates, other than
                                  the Class A-7 and Class A-PO Certificates, that they shall
                                  have been rated "AAA" by Standard & Poor's ("S&P"). It is
                                  a condition to the issuance of the Class A-7 and Class
                                  A-PO Certificates that they shall have been rated "AAAr"
                                  by S&P. S&P assigns the additional rating of "r" to
                                  highlight classes of securities that S&P believes may
                                  experience high volatility or high variability in expected
                                  returns due to non-credit risks. It is a condition to the
                                  issuance of the Class M Certificates that they shall have
                                  been rated at least "AA" by Fitch and S&P. It is a
                                  condition to the issuance of the Class B-1 and Class B-2
                                  Certificates that they shall have been rated at least "A"
                                  and "BBB," respectively, by Fitch. The ratings of Fitch on
                                  mortgage pass-through certificates address the likelihood
                                  of the receipt by the certificateholders of all
                                  distributions of principal and interest to which such
                                  certificateholders are entitled. The ratings of S&P on
                                  mortgage pass-through certificates address the likelihood
                                  of receipt by the certificateholders of timely payment of
                                  interest and the ultimate return of principal. The ratings
                                  by Fitch and S&P are not recommendations to buy, sell or
                                  hold such Certificates and may be subject to revision or
                                  withdrawal at any time by the assigning rating agency. The
                                  ratings do not address the possibility that, as a result
                                  of principal prepayments, holders of such Certificates may
                                  receive a lower than anticipated yield. The ratings also
                                  do not address the possibility that the holder of the
                                  Class A-7 Certificate may not fully recover its initial
                                  investment. See "-- Effects of Prepayments on Investment
                                  Expectations" below and "Ratings" in this Prospectus
                                  Supplement.
</TABLE>
 
                                      S-7
<PAGE>
 
<TABLE>
<S>                               <C>
Description of Certificates.....  The Series 1996-7 Certificates will consist of the Class A
                                  Certificates, the Class M Certificates and the Class B
                                  Certificates. The Class A Certificates represent a type of
                                  interest referred to in the Prospectus as "Senior
                                  Certificates" and the Class M and Class B Certificates
                                  represent a type of interest referred to in the Pro-
                                  spectus as "Subordinated Certificates." As these
                                  designations suggest, the Class A Certificates are
                                  entitled to a certain priority, relative to the Class M
                                  and Class B Certificates, in right of distributions on the
                                  mortgage loans underlying the Series 1996-7 Certificates
                                  (the "Mortgage Loans"). As between the Class M
                                  Certificates and the Class B Certificates, the Class M
                                  Certificates are entitled to a certain priority in right
                                  of distributions on the Mortgage Loans and, as among the
                                  Subclasses of Class B Certificates, the Subclasses with
                                  lower numerical designations are entitled to a certain
                                  priority in right of distributions on the Mortgage Loans
                                  relative to those Subclasses with higher numerical
                                  designations. See "-- Distributions of Principal and
                                  Interest" below.
                                  The Class A Certificates will consist of ten Subclasses,
                                  designated as the Class A-1, Class A-2, Class A-3, Class
                                  A-4, Class A-5, Class A-6, Class A-7, Class A-PO, Class
                                  A-R and Class A-LR Certificates. The Class M Certificates
                                  will not be divided into subclasses. The Class B
                                  Certificates will consist of five Subclasses, designated
                                  as the Class B-1, Class B-2, Class B-3, Class B-4 and
                                  Class B-5 Certificates. The Class A Certificates, the
                                  Class M Certificates and the Class B-1 and Class B-2
                                  Certificates are referred to in this Prospectus Supplement
                                  collectively as the "Offered Certificates." The Class B-1
                                  and Class B-2 Certificates are referred to in this
                                  Prospectus Supplement collectively as the "Offered Class B
                                  Certificates." The Class B-3, Class B-4 and Class B-5
                                  Certificates are not offered hereby and may be retained or
                                  sold by the Seller.
                                  The Offered Certificates have the approximate aggregate
                                  initial principal balances set forth on the cover of this
                                  Prospectus Supplement, except that the Class A-7
                                  Certificate will have no principal balance. Any difference
                                  between the aggregate principal balance of the Class A,
                                  Class M and Offered Class B Certificates as of the date of
                                  issuance of the Series 1996-7 Certificates and the
                                  approximate aggregate initial principal balance of such
                                  Subclasses and Class as of the date of this Prospectus
                                  Supplement will not, with respect to the Class A
                                  Certificates, exceed 5% of the aggregate initial principal
                                  balance of the Class A Certificates stated on the cover of
                                  this Prospectus Supplement and, with respect to the Class
                                  M Certificates and Offered Class B Certificates, will
                                  depend on the final subordination levels for the Series
                                  1996-7 Certificates. Any difference allocated to the Class
                                  A Certificates will be allocated to one or more of the
                                  Subclasses of Class A Certificates, other than the Class
                                  A-7, Class A-R and Class A-LR Certificates.
</TABLE>
 
                                      S-8
<PAGE>
 
<TABLE>
<S>                               <C>
                                  The following table sets forth for each Class and Subclass
                                  indicated the approximate undivided interest in the
                                  principal balance of the Mortgage Loans that is expected
                                  to be evidenced in the aggregate by such Class or Subclass
                                  as of the Closing Date (as defined herein).
</TABLE>
 
                       ---------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                       APPROXIMATE INITIAL
                                                      CLASS OR SUBCLASS                UNDIVIDED INTEREST
                                         -------------------------------------------  ---------------------
<S>                                      <C>                                          <C>        <C>
                                         Class A (other than Class A-PO)              94.68%
                                         Class A-PO*                                  1.57%
                                                                                      ---------
                                         Class A (all Subclasses)                                96.25%
                                         Class M                                                 1.50%
                                         Class B-1                                               1.00%
                                         Class B-2                                               0.50%
                                         Classes B-3, B-4 and B-5                                0.75%
                                                                                                 ----------
                                                                                                 ----------
                                         Total                                                   100.00%
                                                                                                 ----------
                                                                                                 ----------
</TABLE>
 
<TABLE>
<S>                               <C>
                                  *  The Class A-PO Certificates in the aggregate represent
                                  an approximate 4.24% initial interest in the principal
                                  balances of the Mortgage Loans (such interest in the
                                  aggregate, the "Pool Balance (PO Portion)") that have Net
                                  Mortgage Interest Rates, as defined on page S-36, of less
                                  than 7.50% (the "Discount Mortgage Loans").
</TABLE>
 
        ------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
                                  By virtue of the subordination of the Class M and Class B
                                  Certificates, it is possible that the Class A-PO
                                  Certificates may also receive support from certain
                                  payments made with respect to the other Mortgage Loans in
                                  the Trust Estate. The Class A Certificates (other than the
                                  Class A-PO Certificates) and the Class M and Class B
                                  Certificates will evidence the entire remaining interest
                                  in the principal balance of the Mortgage Loans (the "Pool
                                  Balance (Non-PO Portion)").
                                  The following table sets forth for each Class indicated
                                  the approximate undivided interest in the Pool Balance
                                  (Non-PO Portion) that is expected to be evidenced in the
                                  aggregate by such Class as of the Closing Date.
</TABLE>
 
<TABLE>
<CAPTION>
                                              APPROXIMATE INITIAL
                                               UNDIVIDED INTEREST
                                          ----------------------------
                 CLASS                    PERCENTAGE     IN DOLLARS
- ----------------------------------------  ----------  ----------------
<S>                                       <C>         <C>
Class A (other than Class A-PO)               96.19%  $    142,316,000
Class M                                        1.52%  $      2,255,000
Class B                                        2.29%  $      3,382,063
                                          ----------  ----------------
    Totals                                   100.00%  $    147,953,063
                                          ----------  ----------------
                                          ----------  ----------------
</TABLE>
 
        ------------------------------------------------------------------------
 
                                      S-9
<PAGE>
 
<TABLE>
<S>                               <C>
                                  The relative interests in the initial Pool Balance (Non-PO
                                  Portion) represented by the Class A Certificates (other
                                  than the Class A-PO Certificates) and the Class M and
                                  Class B Certificates are subject to change over time
                                  because of the disproportionate allocation of certain
                                  unscheduled principal payments to the Class A Certificates
                                  (other than the Class A-PO Certificates) for a specified
                                  period and the allocation of certain losses and certain
                                  shortfalls first to the Subclasses of Class B Certificates
                                  in reverse numerical order, and then to the Class M
                                  Certificates, prior to the allocation of such losses and
                                  shortfalls to the Class A Certificates, as discussed in
                                  "-- Distributions of Principal and Interest" and
                                  "-- Credit Enhancement" below.
Forms of Certificates;
 Denominations..................  The Offered Certificates will be issued either in
                                  book-entry form or in fully registered, certificated form
                                  ("Definitive Certificates"). The following table sets
                                  forth the original certificate form, the minimum
                                  denomination and the incremental denomination of the
                                  Offered Certificates. The Offered Certificates are not
                                  intended to be directly or indirectly held or beneficially
                                  owned in amounts lower than such minimum denominations.
                                  See "Descriptions of the Certificates -- Denominations" in
                                  this Prospectus Supplement.
</TABLE>
 
- --------------------------------------------------------------------------------
 
                 FORM AND DENOMINATIONS OF OFFERED CERTIFICATES
 
<TABLE>
<CAPTION>
                                                             ORIGINAL CERTIFICATE       MINIMUM      INCREMENTAL
                    CLASS OR SUBCLASS                                FORM            DENOMINATION   DENOMINATION
- ----------------------------------------------------------  -----------------------  -------------  -------------
<S>                                                         <C>                      <C>            <C>
Classes A-1, A-2(1), A-3(1), A-4, A-5 and A-6.............  Book-Entry                $   100,000     $   1,000
Class A-7.................................................  Definitive                $ 3,005,463(2)         N/A
Class A-PO(1).............................................  Definitive                $   100,000     $   1,000
Classes A-R and A-LR......................................  Definitive                $        50           N/A
Class M...................................................  Definitive                $   100,000     $   1,000
Classes B-1 and B-2.......................................  Definitive                $   100,000     $   1,000
</TABLE>
 
- ------------------------------
(1)  In order to aggregate the original principal balance of such Subclass, one
     Certificate of such Subclass will be issued in an incremental denomination
     of less than that shown.
 
(2)  Initial notional amount.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                 <C>
 
                                    BOOK-ENTRY FORM. The Offered Certificates, other than
                                    the Class A-7, Class A-PO, Class A-R, Class A-LR, Class
                                    M and Offered Class B Certificates, will be issued in
                                    book-entry form, through the facilities of The
                                    Depository Trust Company ("DTC"). These Certificates are
                                    referred to collectively in this Prospectus Supplement
                                    as the "Book-Entry Certificates." An investor in a
                                    Subclass of Book-Entry Certificates will not receive a
                                    physical certificate representing its ownership interest
                                    in such Book-Entry Certificates, except under
                                    extraordinary circumstances which are discussed in
                                    "Description of the Certificates -- Book-Entry Form" in
                                    the Prospectus. Instead, DTC will effect payments and
                                    transfers by means of its electronic recordkeeping
                                    services, acting through certain participating
                                    organizations. This may result in certain delays in
                                    receipt of distributions by an investor and may restrict
                                    an investor's ability to pledge its securities. The
                                    rights of investors in the Book-Entry Certificates may
                                    generally only be exercised through DTC and its
 
</TABLE>
                                      S-10
 
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    participating organizations. See "Description of the
                                    Certificates -- Book-Entry Form" in this Prospectus
                                    Supplement.
                                    DEFINITIVE FORM. The Class A-7, Class A-PO, Class A-R,
                                    Class A-LR, Class M and Offered Class B Certificates
                                    will each be issued as Definitive Certificates. See
                                    "Description of the Certificates -- Denominations" and
                                    "-- Definitive Form" in this Prospectus Supplement.
Mortgage Loans....................  GENERAL. The Mortgage Loans, which are the source of
                                    distributions to holders of the Series 1996-7
                                    Certificates, will consist of conventional, fixed
                                    interest rate, monthly pay, fully amortizing, one- to
                                    four-family, residential first mortgage loans, having
                                    original terms to stated maturity ranging from
                                    approximately 10 to approximately 15 years, which may
                                    include loans secured by cooperative housing
                                    corporations. Some of the Mortgage Loans are expected to
                                    be mortgage loans originated in connection with the
                                    relocation of employees of various corporate employers
                                    participating in Norwest Mortgage's relocation program
                                    and of employees of various non-participating employers.
                                    The Mortgage Loans are expected to have the further
                                    specifications set forth in the following table and
                                    under the heading "Description of the Mortgage Loans" in
                                    this Prospectus Supplement.
</TABLE>
 
                                      S-11
<PAGE>
SELECTED MORTGAGE LOAN DATA(1)
(AS OF THE CUT-OFF DATE)
 
<TABLE>
<S>                                                               <C>
Cut-Off Date:                                                     October 1, 1996
Number of Mortgage Loans:                                         485
Aggregate Unpaid Principal Balance(2):                            $150,308,963
Range of Unpaid Principal Balances(2):                            $31,925 to $1,209,972
Average Unpaid Principal Balance(2):                              $309,915
Aggregate Unpaid Principal Balance of Relocation Mortgage
 Loans(2):                                                        $20,303,937
Relocation Mortgage Loans as a Percentage of the Aggregate
 Unpaid Principal Balance(2):                                     13.51%
Range of Mortgage Interest Rates:                                 6.375% to 9.250%
Weighted Average Mortgage Interest Rate(2):                       7.917%
Range of Remaining Terms to Stated Maturity:                      114 months to 180 months
Weighted Average Remaining Term to Stated Maturity(2):            177 months
Range of Original Loan-to-Value Ratios(2):                        13.33% to 95.00%
Weighted Average Original Loan-to-Value Ratio(2):                 70.80%
Geographic Concentration of Mortgaged Properties
 Securing Mortgage Loans in Excess of 5% of the
 Aggregate Unpaid Principal Balance(2):                           California         16.81%
                                                                  New Jersey        8.48%
                                                                  Texas              6.83%
                                                                  New York          6.80%
                                                                  Florida            6.13%
Maximum Five-Digit Zip Code Concentration(2):                     1.15%
</TABLE>
 
- ------------------------------
(1)  Information concerning the Discount Mortgage Loans and Premium Mortgage
     Loans is set forth under "Description of the Mortgage Loans -- General."
 
(2)  Approximate.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
 
                                  CHANGES TO POOL.  Mortgage Loans may be removed from the
                                  pool, or a substitution may be made for certain Mortgage
                                  Loans, in advance of the issuance of the Series 1996-7
                                  Certificates (which is expected to occur on or about
                                  October 29, 1996) (the "Closing Date"). Any of such
                                  Mortgage Loans may be excluded from the Trust Estate (i)
                                  as a result of principal prepayment thereof in full or
                                  (ii) if, as a result of delinquencies or otherwise, the
                                  Seller otherwise deems such exclusion necessary or
                                  desirable. In either event, other Mortgage Loans may be
                                  included in the Trust Estate. This may result in changes
                                  in certain of the pool characteristics set forth in the
                                  table above and elsewhere in this Prospectus Supplement.
                                  In the event that any of the characteristics as of the
                                  Cut-Off Date of the Mortgage Loans that constitute the
                                  Trust Estate on the date of initial issuance of the Series
                                  1996-7 Certificates vary materially from those described
                                  herein, revised information regarding the Mortgage Loans
                                  will be made available to purchasers of the Offered
                                  Certificates on or before such issuance date, and a
                                  Current Report on Form 8-K containing such information
                                  will be filed with the Securities and Exchange Commission
                                  within 15 days following such issuance date. See
 
</TABLE>
                                      S-12
<PAGE>
<PAGE>
 
<TABLE>
<S>                               <C>
                                  "Description of the Mortgage Loans" in this Prospectus
                                  Supplement.
                                  Subsequent to the issuance of the Series 1996-7
                                  Certificates, certain Mortgage Loans may be removed from
                                  the pool through repurchase or, under certain
                                  circumstances, through substitution by the Seller, if the
                                  Mortgage Loans are discovered to have defective
                                  documentation or if they otherwise do not conform to the
                                  standards established by the Seller's representations and
                                  warranties concerning the Mortgage Loans. See "Description
                                  of the Mortgage Loans -- Mandatory Repurchase or
                                  Substitution of Mortgage Loans" in this Prospectus
                                  Supplement.
Optional Termination............  The Seller is entitled, subject to certain conditions
                                  relating to the then-remaining size of the pool, to
                                  purchase all outstanding Mortgage Loans in the pool and
                                  thereby effect early retirement of the Series 1996-7
                                  Certificates. See "Pooling and Servicing Agreement --
                                  Optional Termination" in this Prospectus Supplement.
Underwriting Standards..........  Approximately 94.34% (by Cut-Off Date Aggregate Principal
                                  Balance) of the Mortgage Loans were generally originated
                                  in conformity with the underwriting standards described in
                                  the Prospectus under the heading "The Mortgage Loan
                                  Programs -- Mortgage Loan Underwriting -- Norwest Mortgage
                                  Underwriting" (the "Underwriting Standards"). In certain
                                  instances, exceptions to the Underwriting Standards may
                                  have been granted by Norwest Mortgage. See "The Mortgage
                                  Loan Programs -- Mortgage Loan Underwriting" in the
                                  Prospectus. Approximately 0.62% (by Cut-Off Date Aggregate
                                  Principal Balance) of the Mortgage Loans were reviewed by
                                  United Guaranty Residential Insurance Company ("UGRIC") to
                                  ensure compliance with its credit, appraisal and
                                  underwriting standards (the "Pool Certification
                                  Underwritten Loans"). Neither the Series 1996-7
                                  Certificates nor the Mortgage Loans are insured or
                                  guaranteed under a mortgage pool insurance policy issued
                                  by UGRIC. The Pool Certification Underwritten Loans were
                                  evaluated using credit scoring as described in the
                                  Prospectus under "The Mortgage Loan Programs -- Mortgage
                                  Loan Underwriting -- Pool Certification Underwriting" and,
                                  based on the credit scores of such Mortgage Loans, some of
                                  such Mortgage Loans were re-underwritten.The remaining
                                  approximate 5.04% (by Cut-Off Date Aggregate Principal
                                  Balance) of the Mortgage Loans were purchased by Norwest
                                  Mortgage in bulk purchase transactions and were
                                  underwritten using underwriting standards which may vary
                                  from the Underwriting Standards (the "Bulk Purchase
                                  Underwritten Loans"). However, Norwest Mortgage has in
                                  each case reviewed the underwriting standards applied for
                                  such Bulk Purchase Underwritten Loans and determined that
                                  such variances did not depart materially from the
                                  Underwriting Standards. See "Description of the Mortgage
                                  Loans" in this Prospectus Supplement and "The Mortgage
                                  Loan Programs -- Mortgage Loan Underwriting" in the
                                  Prospectus.
</TABLE>
 
                                      S-13
<PAGE>
 
<TABLE>
<S>                               <C>
Distributions of Principal and
 Interest.......................  DISTRIBUTIONS IN GENERAL.  Distributions on the Series
                                  1996-7 Certificates will be made on the 25th day of each
                                  month, or, if such day is not a business day, on the
                                  succeeding business day (each such date is referred to in
                                  this Prospectus Supplement as a "Distribution Date"),
                                  commencing in November 1996, to holders of record at the
                                  close of business on the last business day of the
                                  preceding month. In the case of the Book-Entry
                                  Certificates, the holder of record will be Cede & Co., as
                                  nominee of DTC.
                                  The amount available for distribution on any Distribution
                                  Date is primarily a function of (i) the amount remitted by
                                  mortgagors of the Mortgage Loans in payment of their
                                  scheduled installments of principal and interest, (ii) the
                                  amount of prepayments made by the mortgagors and (iii)
                                  proceeds from liquidations of defaulted Mortgage Loans.
                                  On any Distribution Date, holders of the Class A
                                  Certificates will be entitled to receive all amounts due
                                  them (other than the Class A-PO Deferred Amount, as
                                  defined on page S-43) before any distributions are made to
                                  holders of the Class M or Class B Certificates on that
                                  Distribution Date. The Class A-PO Certificates will be
                                  entitled to receive the Class A-PO Deferred Amount as
                                  described below. The amount that is available to be
                                  distributed on any Distribution Date will be allocated
                                  first to pay interest due holders of the Class A
                                  Certificates and then, if the amount available for
                                  distribution exceeds the amount of interest due holders of
                                  such Certificates, to pay the principal due to the Class A
                                  Certificates. The likelihood that a holder of a particular
                                  Subclass of Class A Certificates (other than the Class
                                  A-PO Certificates) will receive principal distributions on
                                  any Distribution Date will depend on the priority in which
                                  such Subclass is entitled to principal distributions, as
                                  set forth under the headings "Description of the
                                  Certificates -- Principal (Including Prepayments) --
                                  Allocation of Amount to be Distributed" and "--
                                  Calculation of Amount to be Distributed to the Class A
                                  Certificates (other than the Class A-PO Certificates)" in
                                  this Prospectus Supplement.
                                  After all amounts due on the Class A Certificates (other
                                  than the Class A-PO Deferred Amount) have been paid, the
                                  amount remaining will be distributed, in the following
                                  order, to pay (i) any Class A-PO Deferred Amount first
                                  from amounts otherwise distributable as principal on the
                                  Subclasses of Class B Certificates in reverse numerical
                                  order (I.E., first from amounts otherwise distributable as
                                  principal on the Class B-5 Certificates, then from amounts
                                  otherwise distributable as principal on the Class B-4
                                  Certificates, and so on), and then from amounts otherwise
                                  distributable as principal on the Class M Certificates,
                                  (ii) interest due to the holders of the Class M
                                  Certificates, (iii) principal due to the holders of the
                                  Class M Certificates less any amounts used to pay the
                                  Class A-PO Deferred Amount and (iv) with respect to each
                                  Subclass of Class B Certificates sequentially in numerical
                                  order, interest due and then principal due to the holders
                                  of each such Subclass of
</TABLE>
 
                                      S-14
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Class B Certificates before any Subclasses of Class B
                                  Certificates with higher numerical designations receive
                                  any payments in respect of interest or principal, provided
                                  that the principal due any Subclass will be reduced by any
                                  amount used to pay the Class A-PO Deferred Amount. See
                                  "Description of the Certificates -- Distributions" in this
                                  Prospectus Supplement.
                                  If any mortgagor is delinquent in the payment of principal
                                  or interest on a Mortgage Loan in any month, the
                                  respective Servicer is required to advance such payment
                                  unless such Servicer determines that the delinquent amount
                                  will not be recoverable by such Servicer from insurance
                                  proceeds, liquidation proceeds or other recoveries on the
                                  related Mortgage Loan. The Master Servicer or Trust
                                  Administator may, in certain circumstances, be required to
                                  make such advances upon a Servicer's default on its
                                  obligation to advance. See "Description of the
                                  Certificates -- Periodic Advances" in this Prospectus
                                  Supplement.
                                  INTEREST DISTRIBUTIONS.  The amount of interest to which
                                  holders of each Subclass or Class of Offered Certificates,
                                  other than the Class A-7 and Class A-PO Certificates, will
                                  be entitled each month is calculated based on the
                                  outstanding principal balance of such Subclass or Class as
                                  of the related Distribution Date. Interest will accrue
                                  each month on each such Subclass or Class according to the
                                  following formula: 1/12th of the Pass-Through Rate for
                                  such Subclass or Class multiplied by the outstanding
                                  principal balance of such Subclass or Class as of the
                                  related Distribution Date. The amount of interest to which
                                  the holder of the Class A-7 Certificate is entitled each
                                  month is calculated based on a "notional amount." A
                                  notional amount is an amount other than the actual
                                  outstanding principal balance of a Subclass and is solely
                                  used for the purpose of computing the amount of interest
                                  accrued on such Subclass. A notional amount does not
                                  entitle a holder to receive distributions of principal on
                                  the basis of such notional amount. The notional amount of
                                  the Class A-7 Certificate will equal approximately 5.556%
                                  of the outstanding principal balance of the Class A-2
                                  Certificates. Interest will accrue on the Class A-7
                                  Certificate during each one-month period according to the
                                  following formula: 1/12th of the Pass-Through Rate for
                                  such Subclass multiplied by the notional amount of such
                                  Subclass as of the related Distribution Date. Holders of
                                  the Class A-PO Certificates will not be entitled to
                                  receive distributions of interest. The "Pass-Through Rate"
                                  for each Subclass and Class of Offered Certificates (other
                                  than the Class A-PO Certificates) is the percentage set
                                  forth on the cover of this Prospectus Supplement.
                                  When mortgagors prepay principal or when principal is
                                  recovered through foreclosures or other liquidations of
                                  defaulted Mortgage Loans, a full month's interest for the
                                  month of payment or recovery may not be paid or recovered,
                                  resulting in interest shortfalls. These interest
                                  shortfalls are variously handled, depending on the nature
                                  of the event resulting in the interest shortfall.
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                                  In the case of principal prepayments IN FULL, the Master
                                  Servicer will be obligated to cover resulting interest
                                  shortfalls with respect to a Distribution Date in an
                                  amount (such amount, "Compensating Interest") up to the
                                  lesser of (a) the product of (i) 1/12th of 0.20% and (ii)
                                  the aggregate scheduled principal balance of the Mortgage
                                  Loans with respect to such Distribution Date and (b) the
                                  Available Master Servicing Compensation for such
                                  Distribution Date.
                                  Shortfalls in collection of interest resulting from
                                  principal prepayments in full, to the extent they exceed
                                  the amount of Compensating Interest with respect to a
                                  Distribution Date ("Non-Supported Interest Shortfalls"),
                                  will be allocated pro rata among the Class A Certificates
                                  (other than the Class A-PO Certificates), the Class M
                                  Certificates and the Class B Certificates, based on their
                                  then-outstanding principal balances. The amount allocated
                                  to the Class A or Class B Certificates will be allocated
                                  pro rata among the Subclasses of Class A or Class B
                                  Certificates, as the case may be, based on interest
                                  accrued. See "Description of the Certificates -- Interest"
                                  in this Prospectus Supplement.
                                  Interest shortfalls resulting from partial principal
                                  prepayments will not be covered by the Master Servicer,
                                  but instead will be borne first by the Class B
                                  Certificates in reverse numerical order, second by the
                                  Class M Certificates and, finally, pro rata by the Class A
                                  Certificates (other than the Class A-PO Certificates)
                                  based on interest accrued. See "Description of the
                                  Certificates -- Subordination of Class M and Class B
                                  Certificates" in this Prospectus Supplement.
                                  In addition, the amount of interest required to be
                                  distributed to holders of the Series 1996-7 Certificates
                                  will be reduced by a portion of certain Special Hazard
                                  Losses, Fraud Losses and Bankruptcy Losses attributable to
                                  interest. See "-- Credit Enhancement -- Extent of Loss
                                  Coverage" below and "Description of the Certificates --
                                  Interest" in this Prospectus Supplement.
                                  To the extent that the amount available for distribution
                                  on any Distribution Date is insufficient to permit the
                                  distribution of the applicable amount of accrued interest
                                  on the Class A Certificates (net of any Non-Supported
                                  Interest Shortfall, other shortfalls and losses allocable
                                  to the Class A Certificates as described above), the
                                  amount of interest to be distributed will be allocated
                                  among the outstanding Subclasses of Class A Certificates
                                  (other than the Class A-PO Certificates) in accordance
                                  with their respective entitlements to interest. The amount
                                  of any deficiency will be added to the amount of interest
                                  that such Class A Certificates are entitled to receive on
                                  subsequent Distribution Dates. No interest will accrue on
                                  such deficiencies.
                                  To the extent that the amount available for distribution
                                  on any Distribution Date, after the payment of all amounts
                                  due the Class A Certificates (other than any Class A-PO
                                  Deferred Amount) has been made, is insufficient to permit
                                  distribution in full of accrued interest on the Class M
                                  Certificates (net of any
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                                      S-16
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                                  Non-Supported Interest Shortfall, other shortfalls and
                                  losses allocable to the Class M Certificates as described
                                  above), the amount of any deficiency will be added to the
                                  amount of interest that the Class M Certificates are
                                  entitled to receive on subsequent Distribution Dates. No
                                  interest will accrue on such deficiencies.
                                  To the extent that the amount available for distribution
                                  on any Distribution Date, after the payment of all amounts
                                  due the Class A Certificates (other than the Class A-PO
                                  Deferred Amount), the Class M Certificates and each
                                  Subclass of Class B Certificates with a lower numerical
                                  designation has been made, is insufficient to permit
                                  distribution in full of accrued interest on a Subclass of
                                  Class B Certificates (net of any Non-Supported Interest
                                  Shortfall, other shortfalls and losses allocable to such
                                  Subclass of Class B Certificates as described above), the
                                  amount of any deficiency will be added to the amount of
                                  interest that such Subclass of Class B Certificates is
                                  entitled to receive on subsequent Distribution Dates. No
                                  interest will accrue on such deficiencies.
                                  Interest on the Class A Certificates (other than the Class
                                  A-PO Certificates), the Class M Certificates and the Class
                                  B Certificates will be calculated on the basis of a
                                  360-day year consisting of twelve 30-day months.
                                  See "Description of the Certificates -- Interest" in this
                                  Prospectus Supplement.
                                  PRINCIPAL DISTRIBUTIONS.  The aggregate amount of
                                  principal to which the holders of the Class A Certificates
                                  (other than the holders of the Class A-PO Certificates)
                                  are entitled each month will equal the sum for each
                                  Mortgage Loan of the product of (a) the Non-PO Fraction
                                  applicable to such Mortgage Loan and (b) the sum of (i) a
                                  percentage (the "Class A Percentage") of scheduled
                                  payments of principal on each Mortgage Loan and (ii) a
                                  percentage (the "Class A Prepayment Percentage") of
                                  certain unscheduled payments of principal on each Mortgage
                                  Loan. The "Non-PO Fraction" with respect to any Mortgage
                                  Loan will equal the Net Mortgage Interest Rate for such
                                  Mortgage Loan divided by 7.50%. The Class A Percentage
                                  will be equal, on each Distribution Date, to the
                                  percentage corresponding to the fraction that represents
                                  the ratio of the then-outstanding principal balance of the
                                  Class A Certificates (other than the Class A-PO
                                  Certificates) to the Pool Balance (Non-PO Portion). The
                                  Class A Prepayment Percentage will be equal to the
                                  percentage described in the preceding sentence plus an
                                  additional amount equal to a percentage of the principal
                                  otherwise distributable to the holders of the Subordinated
                                  Certificates. As a result, the percentage of certain
                                  unscheduled principal payments otherwise distributable to
                                  the holders of the Subordinated Certificates that is
                                  instead distributable to the holders of the Class A
                                  Certificates (other than the Class A-PO Certificates) will
                                  be equal to 100% during the first five years beginning on
                                  the first Distribution Date and, subject to meeting
                                  certain conditions, will likely decline during the
                                  subsequent four years, as described under the heading
                                  "Description of the
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                                      S-17
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                                  Certificates -- Principal (Including Prepayments) --
                                  Calculation of Amount to be Distributed to the Class A
                                  Certificates (other than the Class A-PO Certificates)" in
                                  this Prospectus Supplement, until the ninth anniversary of
                                  the first Distribution Date and thereafter will likely be
                                  equal to zero. On each Distribution Date, the Subordinated
                                  Certificates will collectively be entitled to receive the
                                  percentages of the scheduled and certain unscheduled
                                  payments of principal on the portion of each Mortgage Loan
                                  representing the Non-PO Fraction of such Mortgage Loan
                                  equal, in each case, to 100% less the applicable
                                  percentage for the Class A Certificates (other than the
                                  Class A-PO Certificates) described above.
                                  The aggregate amount of principal to which holders of the
                                  Class A-PO Certificates are entitled each month will equal
                                  the sum for each Discount Mortgage Loan of the product of
                                  (a) the PO Fraction for such Mortgage Loan and (b) the sum
                                  of (i) scheduled principal payments on such Mortgage Loan
                                  and (ii) certain unscheduled payments of principal on such
                                  Mortgage Loan. See "Description of the
                                  Certificates -- Principal (Including
                                  Prepayments) -- Calculation of Amount to be Distributed to
                                  the Class A-PO Certificates" in this Prospectus
                                  Supplement. In addition, the Class A-PO Certificates will
                                  be entitled to receive any previously unpaid amounts of
                                  principal to which such Certificates were entitled on
                                  prior Distribution Dates as part of the Class A-PO
                                  Deferred Amount. The "PO Fraction" with respect to any
                                  Discount Mortgage Loan will equal the difference between
                                  1.0 and the Non-PO Fraction for such Discount Mortgage
                                  Loan. The PO Fraction with respect to each Mortgage Loan
                                  that is not a Discount Mortgage Loan will be equal to
                                  zero. See "Description of the Certificates -- Principal
                                  (Including Prepayments)" in this Prospectus Supplement.
                                  The holders of the Class A-PO Certificates will also be
                                  entitled each month to an amount equal to the Class A-PO
                                  Deferred Amount. The Class A-PO Deferred Amount will be
                                  paid to holders of the Class A-PO Certificates only from
                                  amounts otherwise distributable as principal to the
                                  Subclasses of Class B Certificates in reverse numerical
                                  order and then from amounts otherwise distributable as
                                  principal to the Class M Certificates. No interest will
                                  accrue on any Class A-PO Deferred Amount.
                                  Except as described below under "-- Effect of
                                  Subordination Level on Principal Distributions," on each
                                  Distribution Date, the Class M, Class B-1 and Class B-2
                                  Certificates will be entitled to a portion of scheduled
                                  payments and certain unscheduled payments of principal on
                                  the Mortgage Loans allocable to the Subordinated
                                  Certificates that represents the ratio of the then-
                                  outstanding principal balance of the Class M, Class B-1 or
                                  Class B-2 Certificates, as the case may be, to the then-
                                  outstanding principal balance of the Subordinated
                                  Certificates.
                                  The amount that is available for distribution to the
                                  holders of the Class A Certificates on any Distribution
                                  Date as a distribution of principal (other than any Class
                                  A-PO Deferred Amount) is equal to the amount remaining
                                  after deducting the
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                                      S-18
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                                  amount of interest distributable on the Class A
                                  Certificates from the total amount collected that is
                                  available to be distributed to holders of the Series
                                  1996-7 Certificates on such Distribution Date. Principal
                                  will be distributed to the holders of the Class A
                                  Certificates in accordance with the payment priorities
                                  described under the heading "Description of the
                                  Certificates -- Principal (Including
                                  Prepayments) -- Allocation of Amount to be Distributed" in
                                  this Prospectus Supplement.
                                  The amount that is available for distribution to the
                                  holders of the Class M Certificates on any Distribution
                                  Date as a distribution of principal is the amount
                                  remaining after all interest and principal distributions
                                  due on the Class A Certificates (including any Class A-PO
                                  Deferred Amount) and interest due on the Class M
                                  Certificates have been deducted from the total amount
                                  collected that is available to be distributed to holders
                                  of the Series 1996-7 Certificates.
                                  The amount that is available for distribution to the
                                  holders of a Subclass of Class B Certificates on any
                                  Distribution Date as a distribution of principal is the
                                  amount remaining after all interest and principal
                                  distributions due on the Class A Certificates (including
                                  any Class A-PO Deferred Amount), all interest and
                                  principal distributions on the Class M Certificates and
                                  the Subclasses of Class B Certificates with lower
                                  numerical designations and interest due on such Subclass
                                  of Class B Certificates have been deducted from the total
                                  amount collected that is available to be distributed to
                                  holders of the Series 1996-7 Certificates.
                                  EFFECT OF SUBORDINATION LEVEL ON PRINCIPAL DISTRIBUTIONS.
                                    In order to preserve the availability of the original
                                  subordination level as protection against losses on the
                                  Class M Certificates, the Class B-1 Certificates, the
                                  Class B-2 Certificates, the Class B-3 Certificates and the
                                  Class B-4 Certificates, some or all of the Subclasses of
                                  Class B Certificates, as described below, may not be
                                  entitled to distributions of principal on certain
                                  Distribution Dates and the principal balances of such
                                  Subclasses will not be considered for purposes of
                                  allocation of principal among the Subordinated
                                  Certificates.
                                  In the case of the Class M Certificates, if on any
                                  Distribution Date the percentage obtained by dividing the
                                  outstanding principal balance of the Class B Certificates
                                  by the sum of the outstanding principal balances of the
                                  Class A Certificates (other than the Class A-PO
                                  Certificates), the Class M Certificates and the Class B
                                  Certificates is less than such percentage was upon the
                                  initial issuance of the Series 1996-7 Certificates, then
                                  the Class B Certificates will not be entitled to
                                  distributions of principal on such Distribution Date and
                                  the Class M Certificates will be entitled to all
                                  distributions of principal allocable to the Subordinated
                                  Certificates for such Distribution Date.
                                  In the case of the Class B-1, Class B-2, Class B-3 or
                                  Class B-4 Certificates, if on any Distribution Date the
                                  percentage obtained by dividing the sum of the
                                  then-outstanding principal balances of the Subclasses of
                                  Class B Certificates with higher numerical
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                                      S-19
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                                  designations by the sum of the then-outstanding principal
                                  balances of the Class A Certificates (other than the Class
                                  A-PO Certificates), the Class M Certificates and the Class
                                  B Certificates is less than such percentage at the time of
                                  the initial issuance of the Series 1996-7 Certificates,
                                  then such Subclasses of Class B Certificates with higher
                                  numerical designations will not be entitled to
                                  distributions of principal and the principal balances of
                                  such Subclasses will not be taken into account for
                                  purposes of calculating the portions of scheduled and
                                  unscheduled principal payments allocable to the Class M
                                  Certificates and to the Subclasses of Class B Certificates
                                  with lower numerical designations.
                                  In either of the cases described above, the Class M
                                  Certificates and those Subclasses of Class B Certificates
                                  with lower numerical designations will receive a greater
                                  portion of scheduled and unscheduled payments of principal
                                  on the Mortgage Loans allocable to the Subordinated
                                  Certificates than the Class M Certificates and those
                                  Subclasses of Class B Certificates with lower numerical
                                  designations would have received had all Subclasses of
                                  Class B Certificates been entitled to their portion of
                                  such principal payments. See "Description of the
                                  Certificates -- Principal (Including Prepayments) --
                                  Calculation of Amount to be Distributed to the Class M and
                                  Class B Certificates" in this Prospectus Supplement.
Credit Enhancement..............  DESCRIPTION OF "SHIFTING-INTEREST" SUBORDINATION.   The
                                  rights of the holders of the Class M Certificates to
                                  receive distributions will be subordinated to the rights
                                  of the holders of the Class A Certificates to receive
                                  distributions, to the extent described herein. The rights
                                  of the holders of a Subclass of Class B Certificates to
                                  receive distributions will be subordinated to the rights
                                  of the holders of the Class A Certificates, the Class M
                                  Certificates and the Subclasses of Class B Certificates
                                  with lower numerical designations to receive
                                  distributions, to the extent described herein. This
                                  subordination provides a certain amount of protection to
                                  the holders of the Class A Certificates (to the extent of
                                  the subordination of the Class M and Class B
                                  Certificates), the Class M Certificates (to the extent of
                                  the subordination of the Class B Certificates) and the
                                  Subclasses of Class B Certificates (other than the Class
                                  B-5 Certificates) (to the extent of the subordination of
                                  the Subclasses of Class B Certificates with higher
                                  numerical designations) against delays in the receipt of
                                  scheduled payments of interest and principal and against
                                  losses associated with the liquidation of defaulted
                                  Mortgage Loans and certain losses resulting from the
                                  bankruptcy of a mortgagor.
                                  In general, the protection afforded the holders of the
                                  Class A Certificates by means of this subordination will
                                  be effected in two ways: (i) by the preferential right of
                                  the holders of the Class A Certificates to receive, prior
                                  to any distribution being made on any Distribution Date in
                                  respect of the Class M and Class B Certificates, the
                                  amounts of interest and principal due the holders of the
                                  Class A Certificates (other than the
                                  Class A-PO Deferred Amount) and, if necessary, by the
                                  right of
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                                      S-20
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                                  such holders to receive future distributions on the
                                  Mortgage Loans that would otherwise have been allocated to
                                  the holders of the Class M and Class B Certificates and
                                  (ii) by the allocation to the Class M and Class B
                                  Certificates, until their respective principal balances
                                  have been reduced to zero, of certain losses resulting
                                  from the liquidation of defaulted Mortgage Loans or the
                                  bankruptcy of mortgagors prior to the allocation of such
                                  losses to the Class A Certificates. See "Description of
                                  the Certificates -- Distributions" in this Prospectus
                                  Supplement.
                                  In general, the protection afforded the holders of the
                                  Class M Certificates by means of this subordination will
                                  also be effected in two ways: (i) by the preferential
                                  right of the holders of the Class M Certificates to
                                  receive, prior to any distribution being made on any
                                  Distribution Date in respect of the Class B Certificates,
                                  the amounts of interest and principal due the holders of
                                  the Class M Certificates on such date and, if necessary,
                                  by the right of such holders to receive future
                                  distributions on the Mortgage Loans that would otherwise
                                  have been allocated to the holders of the Class B
                                  Certificates and (ii) by the allocation to the Class B
                                  Certificates, until their principal balance has been
                                  reduced to zero, of certain losses resulting from the
                                  liquidation of defaulted Mortgage Loans or the bankruptcy
                                  of mortgagors prior to the allocation of such losses to
                                  the Class M Certificates. See "Description of the
                                  Certificates -- Distributions" in this Prospectus
                                  Supplement.
                                  In general, the protection afforded the holders of a
                                  Subclass of Class B Certificates by means of this
                                  subordination will also be effected in two ways: (i) by
                                  the preferential right of the holders of such Subclass to
                                  receive, prior to any distribution being made on any
                                  Distribution Date in respect of the Subclasses of Class B
                                  Certificates with higher numerical designations, the
                                  amounts of interest and principal due the holders of such
                                  Subclass on such date and, if necessary, by the right of
                                  such holders to receive future distributions on the
                                  Mortgage Loans that would otherwise have been allocated to
                                  the holders of the Subclasses of Class B Certificates with
                                  higher numerical designations and (ii) by the allocation
                                  to the Subclasses of Class B Certificates with higher
                                  numerical designations, until their principal balances
                                  have been reduced to zero, of certain losses resulting
                                  from the liquidation of defaulted Mortgage Loans or the
                                  bankruptcy of mortgagors prior to the allocation of such
                                  losses to such Subclass. See "Description of the
                                  Certificates -- Distributions" in this Prospectus
                                  Supplement.
                                  In addition, in order to increase the period during which
                                  the principal balances of the Class M and Class B
                                  Certificates remain available as credit enhancement to the
                                  Class A Certificates, a disproportionate amount of
                                  prepayments and certain unscheduled recoveries with
                                  respect to the Mortgage Loans will be allocated to the
                                  Class A Certificates (other than the Class A-PO
                                  Certificates). This allocation has the effect of
                                  accelerating the amortization of the Class A Certificates
                                  (other than the Class A-PO Certificates) while, in the
                                  absence of losses in respect of the liquidation of
                                  defaulted Mortgage Loans or losses resulting from
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                                      S-21
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                                  the bankruptcy of mortgagors, increasing the respective
                                  percentage interests in the principal balance of the
                                  Mortgage Loans evidenced by the Class M and Class B
                                  Certificates.
                                  As a result of the method of calculating the Class A-4
                                  Priority Amount (as defined herein) and the priorities for
                                  the allocation of the Class A Non-PO Principal
                                  Distribution Amount (as defined herein), it is expected
                                  that, absent an exceptionally high rate of principal
                                  prepayments on the Mortgage Loans, no principal
                                  prepayments will be allocated to the Class A-4
                                  Certificates during the first five years following the
                                  issuance of the Series 1996-7 Certificates and that, while
                                  the percentage of principal prepayments allocated to the
                                  Class A-4 Certificates during the four years thereafter
                                  will gradually increase, such percentage, until the tenth
                                  year following the issuance of the Series 1996-7
                                  Certificates, will be disproportionately lower than the
                                  percentage of such principal prepayments allocated to the
                                  other Class A Certificates (other than the Class A-PO
                                  Certificates). See "Description of the Certificates --
                                  Principal (Including Prepayments) -- Allocation of Amount
                                  to be Distributed" and "Prepayment and Yield
                                  Considerations" in this Prospectus Supplement.
                                  EXTENT OF LOSS COVERAGE.  Realized losses on Mortgage
                                  Loans, other than losses that are (i) attributable to
                                  "special hazards" not insured against under a standard
                                  hazard insurance policy, (ii) incurred on defaulted
                                  Mortgage Loans as to which there was fraud in the
                                  origination of such Mortgage Loans or (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 interest rate on a Mortgage Loan or an extension
                                  of its maturity, will not be allocated to the Class A
                                  Certificates until the date on which the aggregate
                                  principal balance of the Class M and Class B Certificates
                                  (which aggregate balance is expected initially to be
                                  approximately $5,637,063) has been reduced to zero; will
                                  not be allocated to the Class M Certificates until the
                                  date on which the aggregate principal balance of the Class
                                  B Certificates (which aggregate balance is expected
                                  initially to be approximately $3,382,063) has been reduced
                                  to zero; and will not be allocated to the Class B-1 or
                                  Class B-2 Certificates until the date on which the
                                  aggregate principal balance of the Subclasses of Class B
                                  Certificates with higher numerical designations has been
                                  reduced to zero (which aggregate balance is expected
                                  initially to be approximately $1,879,063 with respect to
                                  the Class B-1 Certificates and approximately $1,128,063
                                  with respect to the Class B-2 Certificates). Such losses
                                  will be allocated first among the Subclasses of Class B
                                  Certificates, in reverse numerical order (that is, to the
                                  Class B-5, Class B-4, Class B-3, Class B-2 and Class B-1
                                  Certificates, respectively).
                                  With respect to any Distribution Date subsequent to the
                                  first Distribution Date, the availability of the credit
                                  enhancement provided by the Class M Certificates and the
                                  Subclasses of Class B Certificates will be affected by the
                                  prior reduction of the
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                                      S-22
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                                  principal balance of the Class M Certificates and such
                                  Subclasses of Class B Certificates. Reduction of the
                                  principal balance of the Class M Certificates and any
                                  Subclass of Class B Certificates will result from (i) the
                                  prior allocation of losses due to the liquidation of
                                  defaulted Mortgage Loans, including losses due to special
                                  hazards and fraud losses up to the respective limits
                                  referred to below, (ii) the prior allocation of bankruptcy
                                  losses up to the limit referred to below and (iii) the
                                  prior receipt of principal distributions by the holders of
                                  such Certificates.
                                  As of the date of issuance of the Series 1996-7
                                  Certificates, the amount of losses attributable to special
                                  hazards, fraud and bankruptcy that will be absorbed solely
                                  by the holders of the Subclasses of Class B Certificates
                                  in reverse numerical order and then solely by the holders
                                  of the Class M Certificates will be approximately 1.61%,
                                  2.00% and 0.07%, respectively, of the Cut-Off Date
                                  Aggregate Principal Balance of the Mortgage Loans
                                  (approximately $2,419,943, $3,006,179 and $100,000,
                                  respectively). If losses due to special hazards, fraud or
                                  bankruptcy exceed any of such amounts prior to the
                                  principal balances of the Class M and Class B Certificates
                                  being reduced to zero, (a) the principal portion of any
                                  such excess losses with respect to the Mortgage Loans will
                                  generally be shared pro rata by (i) the Class A
                                  Certificates (other than the Class A-PO Certificates), the
                                  Class M Certificates and the Class B Certificates and (ii)
                                  to the extent such losses arise with respect to Discount
                                  Mortgage Loans, the Class A-PO Certificates, in each case
                                  according to their respective interests in such Mortgage
                                  Loans and (b) the interest portion of any such losses with
                                  respect to the Mortgage Loans will generally be shared pro
                                  rata by the Class A, Class M and Class B Certificates
                                  based on their respective interest accrual amounts. Under
                                  certain circumstances, the limits set forth above may be
                                  reduced as described under "Description of the
                                  Certificates -- Subordination of Class M and Class B
                                  Certificates -- Allocation of Losses" in this Prospectus
                                  Supplement.
                                  After the principal balances of the Class M and Class B
                                  Certificates have been reduced to zero, the principal
                                  portion of all losses (other than the portion attributable
                                  to the Class A-PO Certificates, if any) will be allocated
                                  to the Class A Certificates (other than the Class A-PO
                                  Certificates). To the extent such losses arise with
                                  respect to Discount Mortgage Loans, principal losses will
                                  be shared among the Class A Certificates, according to
                                  their respective interests in such Mortgage Loans. The
                                  principal portion of any losses borne by the Class A
                                  Certificates (other than losses borne by the Class A-PO
                                  Certificates) will be shared pro rata by the Subclasses of
                                  Class A Certificates (other than the Class A-PO
                                  Certificates) based on their then-outstanding principal
                                  balances and the interest portion of such losses will be
                                  shared pro rata by such Subclasses based on interest
                                  accrued. See "Description of the Certificates -- Interest"
                                  and "-- Subordination of Class M and Class B Certificates
                                  -- Allocation of Losses" in this Prospectus Supplement.
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                                      S-23
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                                  THE YIELD TO MATURITY ON THE CLASS M CERTIFICATES WILL BE
                                  MORE SENSITIVE TO LOSSES DUE TO LIQUIDATIONS OF THE
                                  MORTGAGE LOANS (AND THE TIMING THEREOF) THAN THAT ON THE
                                  CLASS A CERTIFICATES, IN THE EVENT THAT THE AGGREGATE
                                  PRINCIPAL BALANCE OF THE CLASS B CERTIFICATES HAS BEEN
                                  REDUCED TO ZERO.
                                  THE YIELD TO MATURITY ON EACH SUBCLASS OF OFFERED CLASS B
                                  CERTIFICATES WILL BE MORE SENSITIVE TO LOSSES DUE TO
                                  LIQUIDATIONS OF THE MORTGAGE LOANS (AND THE TIMING
                                  THEREOF) THAN THAT ON THE CLASS A CERTIFICATES AND THE
                                  CLASS M CERTIFICATES AND, IN THE CASE OF THE CLASS B-2
                                  CERTIFICATES, THE CLASS B-1 CERTIFICATES, IN THE EVENT
                                  THAT THE PRINCIPAL BALANCES OF THE SUBCLASSES OF CLASS B
                                  CERTIFICATES WITH HIGHER NUMERICAL DESIGNATIONS HAVE BEEN
                                  REDUCED TO ZERO.
                                  See "Description of the Certificates -- Subordination of
                                  Class M and Class B Certificates" in this Prospectus
                                  Supplement.
Effects of Prepayments on In-
 vestment Expectations..........  The actual rate of prepayment of principal on the Mortgage
                                  Loans cannot be predicted. The investment performance of
                                  the Offered Certificates may vary materially and adversely
                                  from the investment expectations of investors due to
                                  prepayments on the Mortgage Loans being higher or lower
                                  than anticipated by investors. In addition, the Class A
                                  Certificates (other than the Class A-PO Certificates) in
                                  the aggregate will be more sensitive to prepayments on the
                                  Mortgage Loans than the Subordinated Certificates due to
                                  the disproportionate allocation of such prepayments to
                                  investors in such Class A Certificates then entitled to
                                  principal distributions during the nine years beginning on
                                  the first Distribution Date. The actual yield to the
                                  holder of an Offered Certificate may not be equal to the
                                  yield anticipated at the time of purchase of the
                                  Certificate or, notwithstanding that the actual yield is
                                  equal to the yield anticipated at that time, the total
                                  return on investment expected by the investor or the
                                  expected weighted average life of the Certificate may not
                                  be realized. These effects are summarized below. IN
                                  DECIDING WHETHER TO PURCHASE ANY OFFERED CERTIFICATES, AN
                                  INVESTOR SHOULD MAKE AN INDEPENDENT DECISION AS TO THE
                                  APPROPRIATE PREPAYMENT ASSUMPTIONS TO BE USED.
                                  YIELD.  If an investor purchases an Offered Certificate
                                  (other than a Class A-PO Certificate) at an amount equal
                                  to its unpaid principal balance (that is, at "par"), the
                                  effective yield to that investor (assuming that there are
                                  no interest shortfalls and assuming the full return of the
                                  investor's invested principal) will approximate the
                                  Pass-Through Rate on that Certificate. If an investor pays
                                  less or more than the unpaid principal balance of an
                                  Offered Certificate (that is, buys the Certificate at a
                                  "discount" or "premium," respectively), then, based on the
                                  assumptions set forth in the preceding sentence, the
                                  effective yield to the investor will be higher or lower,
                                  respectively, than the stated interest rate on the
                                  Certificate, because such discount or premium will be
                                  amortized over the life of the Certificate. Any deviation
                                  in the actual rate of prepayments on the Mortgage Loans
                                  from the rate assumed by the investor will affect the
                                  period of time over which, or the rate at which, the
                                  discount or premium will be amortized and, consequently,
                                  will change the investor's
</TABLE>
 
                                      S-24
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                                  actual yield from that anticipated. The timing of receipt
                                  of prepayments may also affect the investor's actual
                                  yield. The yield experienced by an investor in the Class
                                  A-PO Certificates, which do not bear interest, is
                                  primarily a function of the price paid by such investor,
                                  the rate and timing of principal payments on the Discount
                                  Mortgage Loans and losses incurred on and after the
                                  Cross-Over Date. The particular sensitivity of the Class
                                  A-PO Certificates is displayed in the table appearing
                                  under the heading "Prepayment and Yield Considerations" in
                                  this Prospectus Supplement. AN INVESTOR THAT PURCHASES ANY
                                  OFFERED CERTIFICATES AT A DISCOUNT, PARTICULARLY THE CLASS
                                  A-PO CERTIFICATES, SHOULD CONSIDER THE RISK THAT A SLOWER
                                  THAN ANTICIPATED RATE OF PRINCIPAL PAYMENTS ON THE
                                  MORTGAGE LOANS OR, IN THE CASE OF THE CLASS A-PO
                                  CERTIFICATES, ON THE DISCOUNT MORTGAGE LOANS, WILL RESULT
                                  IN AN ACTUAL YIELD THAT IS LOWER THAN SUCH INVESTOR'S
                                  EXPECTED YIELD. AN INVESTOR THAT PURCHASES ANY OFFERED
                                  CERTIFICATES AT A PREMIUM , OR THAT PURCHASES THE CLASS
                                  A-7 CERTIFICATE, WHICH HAS NO PRINCIPAL BALANCE, SHOULD
                                  CONSIDER THE RISK THAT A FASTER THAN ANTICIPATED RATE OF
                                  PRINCIPAL PAYMENTS ON THE MORTGAGE LOANS WILL RESULT IN AN
                                  ACTUAL YIELD THAT IS LOWER THAN SUCH INVESTOR'S EXPECTED
                                  YIELD AND SHOULD CONSIDER THE RISK THAT A RAPID RATE OF
                                  PRINCIPAL PAYMENTS ON THE MORTGAGE LOANS COULD RESULT IN
                                  THE FAILURE OF SUCH INVESTOR TO FULLY RECOVER ITS INITIAL
                                  INVESTMENT. THE YIELD ON THE CLASS A-PO CERTIFICATES WILL
                                  BE INFLUENCED PRIMARILY BY PRINCIPAL PAYMENTS WITH RESPECT
                                  TO THE DISCOUNT MORTGAGE LOANS.
                                  The yield to an investor in the Class A-7 Certificate,
                                  which has no principal balance, will be sensitive to both
                                  the timing of receipt of prepayments and the overall rate
                                  of prepayment on the Mortgage Loans. The particular
                                  sensitivity of the Class A-7 Certificate is separately
                                  displayed in the table appearing under the heading
                                  "Prepayment and Yield Considerations" in this Prospectus
                                  Supplement. AN INVESTOR IN THE CLASS A-7 CERTIFICATE
                                  SHOULD CONSIDER THE RISK THAT A RAPID RATE OF PRINCIPAL
                                  PAYMENTS ON THE MORTGAGE LOANS COULD RESULT IN THE FAILURE
                                  OF SUCH INVESTOR TO FULLY RECOVER ITS INITIAL INVESTMENT.
                                  REINVESTMENT RISK.  As stated above, if an Offered
                                  Certificate (other than a Class A-PO Certificate) is
                                  purchased at par, fluctuations in the rate of
                                  distributions of principal will generally not affect the
                                  yield to maturity of that Certificate. However, the total
                                  return on any investor's investment, including an investor
                                  who purchases at par, will be reduced to the extent that
                                  principal distributions received on its Certificate cannot
                                  be reinvested at a rate as high as the stated interest
                                  rate of the Certificate or, in the case of the Class A-PO
                                  Certificates, the expected yield, which is based on the
                                  price paid by the investor and the rate of prepayments
                                  anticipated by such investor. Investors in the Offered
                                  Certificates should consider the risk that rapid rates of
                                  prepayments on the Mortgage Loans may coincide with
                                  periods of low prevailing market interest rates. During
                                  periods of low prevailing market interest rates,
                                  mortgagors may be expected to prepay or refinance Mortgage
                                  Loans that carry interest rates significantly higher than
                                  then-current interest rates for mortgage loans. Con-
                                  sequently, the amount of principal distributions available
                                  to an
</TABLE>
 
                                      S-25
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<TABLE>
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                                  investor for reinvestment at such low prevailing interest
                                  rates may be relatively large. Conversely, slow rates of
                                  prepayments on the Mortgage Loans may coincide with
                                  periods of high prevailing market interest rates. During
                                  such periods, it is less likely that mortgagors will elect
                                  to prepay or refinance Mortgage Loans and, therefore, the
                                  amount of principal distributions available to an investor
                                  for reinvestment at such high prevailing interest rates
                                  may be relatively small.
                                  WEIGHTED AVERAGE LIFE VOLATILITY.  One indication of the
                                  impact of varying prepayment speeds on a security is the
                                  change in its weighted average life. The "weighted average
                                  life" of an Offered Certificate (other than the Class A-7
                                  Certificate) is the average amount of time that will
                                  elapse between the date of issuance of the Certificate and
                                  the date on which each dollar in reduction of the
                                  principal balance of the Certificate is distributed to the
                                  investor. The weighted average life of the Class A-7
                                  Certificate is the average amount of time that will elapse
                                  between the date of issuance of the Series 1996-7
                                  Certificates and the date on which each dollar in
                                  reduction of the principal balance of the Class A-2
                                  Certificates (a portion of the principal balance of which
                                  corresponds to the notional amount of the Class A-7
                                  Certificate) is distributed to the investors in the Class
                                  A-2 Certificates. Low rates of prepayment may result in
                                  the extension of the weighted average life of a
                                  Certificate; high rates, in the shortening of such
                                  weighted average life.
                                  In general, if the weighted average life of a Certificate
                                  purchased at par is extended beyond that initially
                                  anticipated, such Certificate's market value may be
                                  adversely affected even though the yield to maturity on
                                  the Certificate is unaffected. The weighted average life
                                  of the Class A-PO Certificates will be determined by the
                                  rate of prepayment of the Discount Mortgage Loans and
                                  generally will not be affected by the rate of prepayment
                                  on other Mortgage Loans.
                                  The weighted average lives of the Offered Certificates,
                                  under various prepayment scenarios, are displayed in the
                                  tables appearing under the heading "Prepayment and Yield
                                  Considerations" in this Prospectus Supplement.
Federal Income Tax Status.......  For federal income tax purposes, the Trust Estate will
                                  consist of two separate real estate mortgage investment
                                  conduits (the "Upper-Tier REMIC" and the "Lower-Tier
                                  REMIC," respectively).The Class A-1, Class A-2, Class A-3,
                                  Class A-4, Class A-5, Class A-6, Class A-7 and Class A-PO
                                  Certificates, the Class M Certificates, and the Class B-1,
                                  Class B-2, Class B-3, Class B-4 and Class B-5 Certificates
                                  will constitute "regular interests" in the Upper-Tier
                                  REMIC and the Class A-R and the Class A-LR Certificates
                                  will constitute the "residual interests" in the Up-
                                  per-Tier REMIC and Lower-Tier REMIC, respectively.
                                  The Regular Certificates (as defined herein) generally
                                  will be treated as newly originated debt instruments for
                                  federal income tax purposes. Beneficial owners of the
                                  Regular Certificates will be required to report income
                                  thereon in accordance with the accrual method of
                                  accounting. Although not free from doubt, it
</TABLE>
 
                                      S-26
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                                  is anticipated that the Class A-7 Certificate will be
                                  issued with original issue discount in an amount equal to
                                  the excess of all distributions of interest expected to be
                                  received thereon over its issue price (including accrued
                                  interest). The Class A-PO Certificates will be issued with
                                  original issue discount in an amount equal to the excess
                                  of the initial principal balance thereof over their issue
                                  price. It is anticipated that the Class B-2 Certificates
                                  will be issued with original issue discount in an amount
                                  equal to the excess of their initial principal balance
                                  (plus four days of interest at the Pass-Through Rate
                                  thereon) over their issue price (including accrued
                                  interest). It is also anticipated that the Class A-1,
                                  Class A-2, Class A-3, Class A-4, Class A-5, Class A-6 and
                                  Class M Certificates will be issued at a premium and that
                                  the Class B-1 Certificates will be issued with DE MINIMIS
                                  original issue discount for federal income tax purposes.
                                  Finally, it is anticipated that the Class B-3, Class B-4
                                  and Class B-5 Certificates, which are not offered hereby,
                                  will be issued with original issue discount for federal
                                  income tax purposes.
                                  Holders of the Class A-R and Class A-LR Certificates will
                                  be required to include the taxable income or loss of the
                                  Upper-Tier REMIC and Lower-Tier REMIC, respectively, in
                                  determining their federal taxable income. It is
                                  anticipated that all or a substantial portion of the
                                  taxable income of the Upper-Tier REMIC and Lower-Tier
                                  REMIC includible by the Class A-R and Class A-LR
                                  Certificateholders will be treated as "excess inclusion"
                                  income subject to special limitations for federal income
                                  tax purposes. AS A RESULT, THE EFFECTIVE AFTER-TAX RETURN
                                  OF THE CLASS A-R AND CLASS A-LR CERTIFICATES MAY BE
                                  SIGNIFICANTLY LOWER THAN WOULD BE THE CASE IF THE CLASS
                                  A-R AND CLASS A-LR CERTIFICATES WERE TAXED AS DEBT
                                  INSTRUMENTS, OR MAY BE NEGATIVE. FURTHER, SIGNIFICANT
                                  RESTRICTIONS APPLY TO THE TRANSFER OF THE CLASS A-R AND
                                  CLASS A-LR CERTIFICATES. THE CLASS A-R AND CLASS A-LR
                                  CERTIFICATES WILL BE CONSIDERED "NONECONOMIC RESIDUAL
                                  INTERESTS," CERTAIN TRANSFERS OF WHICH MAY BE DISREGARDED
                                  FOR FEDERAL INCOME TAX PURPOSES.
                                  See "Description of the Certificates -- Restrictions on
                                  Transfer of the Class A-R, Class A-LR, Class M and Offered
                                  Class B Certificates" and "Federal Income Tax
                                  Considerations" in this Prospectus Supplement and "Certain
                                  Federal Income Tax Consequences -- Federal Income Tax
                                  Consequences for REMIC Certificates" in the Prospectus.
ERISA Considerations............  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 Internal Revenue
                                  Code of 1986, as amended (the "Code"), or a governmental
                                  plan subject to any federal, state or local law ("Similar
                                  Law") which is, to a material extent, similar to the
                                  foregoing provisions of ERISA or the Code (collectively, a
                                  "Plan"), should carefully review with its legal advisors
                                  whether the purchase or holding of Offered Certificates
                                  could give rise to a transaction prohibited or not
                                  otherwise permissible under ERISA, the Code or Similar
                                  Law. BECAUSE THE CLASS M AND OFFERED CLASS B CERTIFICATES
                                  ARE SUBORDINATED TO THE CLASS A CERTIFICATES, THE CLASS M
                                  AND OFFERED CLASS B CERTIFICATES MAY NOT BE TRANSFERRED
                                  UNLESS THE TRANSFEREE HAS DELIVERED (I) A
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                                      S-27
<PAGE>
 
<TABLE>
<S>                               <C>
                                  REPRESENTATION LETTER TO THE TRUSTEE AND SELLER STATING
                                  EITHER (A) THAT THE TRANSFEREE IS NOT A PLAN AND IS NOT
                                  ACTING ON BEHALF OF A PLAN OR USING THE ASSETS OF A PLAN
                                  TO EFFECT SUCH PURCHASE OR (B) SUBJECT TO CERTAIN
                                  CONDITIONS DESCRIBED HEREIN, THAT THE SOURCE OF FUNDS USED
                                  TO PURCHASE THE CLASS M OR OFFERED CLASS B CERTIFICATES IS
                                  AN "INSURANCE COMPANY GENERAL ACCOUNT" OR (II) AN OPINION
                                  OF COUNSEL AS DESCRIBED UNDER "ERISA CONSIDERATIONS" IN
                                  THIS PROSPECTUS SUPPLEMENT RELATING TO THE OFFERING OF
                                  SUCH CERTIFICATES. NEITHER THE CLASS A-R NOR CLASS A-LR
                                  CERTIFICATE MAY BE PURCHASED BY OR TRANSFERRED TO A PLAN.
                                  See "ERISA Considerations" in this Prospectus Supplement
                                  and in the Prospectus.
Legal Investment................  The Class A and Class M Certificates will constitute
                                  "mortgage related securities" for purposes of the
                                  Secondary Mortgage Market Enhancement Act of 1984 (the
                                  "Enhancement Act") so long as they are rated in one of the
                                  two highest rating categories by at least one nationally
                                  recognized statistical rating organization. As such, the
                                  Class A and Class M Certificates are legal investments for
                                  certain entities to the extent provided in the Enhancement
                                  Act. However, there are regulatory requirements and
                                  considerations applicable to regulated financial
                                  institutions and restrictions on the ability of such
                                  institutions to invest in certain types of mortgage
                                  related securities. The Class B-1 and Class B-2 Cer-
                                  tificates will not constitute "mortgage related
                                  securities" under the Enhancement Act. The appropriate
                                  characterization of the Class B-1 and Class B-2
                                  Certificates under various legal investment restrictions,
                                  and thus the ability of investors subject to these
                                  restrictions to purchase the Class B-1 and Class B-2
                                  Certificates, may be subject to significant interpretive
                                  uncertainties. Prospective purchasers of the Offered
                                  Certificates should consult their own legal, tax and
                                  accounting advisors in determining the suitability of and
                                  consequences to them of the purchase, ownership and
                                  disposition of the Offered Certificates. See "Legal In-
                                  vestment" in this Prospectus Supplement.
</TABLE>
 
                                      S-28
<PAGE>
                                  RISK FACTORS
 
GENERAL
 
    The rate of distributions in reduction of the principal balance of any
Subclass or Class of Offered Certificates, the aggregate amount of distributions
of principal and interest on any Subclass or Class of Offered Certificates and
the yield to maturity of any Subclass or Class of Offered Certificates will be
directly related to the rate of payments of principal on the Mortgage Loans in
the Trust Estate or, in the case of the Class A-PO Certificates, on the Discount
Mortgage Loans, and the amount and timing of mortgagor defaults resulting in
Realized Losses. The rate of principal payments on the Mortgage Loans will in
turn be affected by the amortization schedules of the Mortgage Loans, the rate
of principal prepayments (including partial prepayments and those resulting from
refinancing) thereon by mortgagors, liquidations of defaulted Mortgage Loans,
repurchases of Mortgage Loans by the Seller as a result of defective
documentation or breaches of representations and warranties, optional purchase
by the Seller of defaulted Mortgage Loans and optional purchase by the Seller of
all of the Mortgage Loans in connection with the termination of the Trust
Estate. See "Pooling and Servicing Agreement -- Optional Termination" herein and
"The Pooling and Servicing Agreement -- Assignment of Mortgage Loans to the
Trustee," "-- Optional Purchases" and "-- Termination; Purchase of Mortgage
Loans" in the Prospectus. Mortgagors are permitted to prepay the Mortgage Loans,
in whole or in part, at any time without penalty.
 
    The rate of payments (including prepayments) on pools of mortgage loans is
influenced by a variety of economic, geographic, social and other factors. If
prevailing rates for similar mortgage loans fall below the Mortgage Interest
Rates on the Mortgage Loans, the rate of prepayment would generally be expected
to increase. Conversely, if interest rates on similar mortgage loans rise above
the Mortgage Interest Rates on the Mortgage Loans, the rate of prepayment would
generally be expected to decrease.
 
    An investor that purchases any Offered Certificates at a discount,
particularly the Class A-PO Certificates, should consider the risk that a slower
than anticipated rate of principal payments on the Mortgage Loans or, in the
case of the Class A-PO Certificates, on the Discount Mortgage Loans, will result
in an actual yield that is lower than such investor's expected yield. An
investor that purchases any Offered Certificates at a premium, or that purchases
the Class A-7 Certificate, which has no principal balance, should consider the
risk that a faster than anticipated rate of principal payments on the Mortgage
Loans will result in an actual yield that is lower than such investor's expected
yield. See "Prepayment and Yield Considerations" herein.
 
SUBORDINATION
 
    The rights of the holders of the Class M Certificates to receive
distributions with respect to the Mortgage Loans in the Trust Estate will be
subordinated to such rights of the holders of the Class A Certificates and the
rights of the holders of a Subclass of Class B Certificates to receive
distributions with respect to the Mortgage Loans in the Trust Estate will be
subordinated to such rights of the holders of the Class A Certificates, the
Class M Certificates and the Subclasses of Class B Certificates with lower
numerical designations, all to the extent described herein under "Description of
the Certificates -- Subordination of Class M and Class B Certificates."
 
BOOK-ENTRY SYSTEM FOR CERTAIN SUBCLASSES OF CLASS A CERTIFICATES
 
    Transactions in the Book-Entry Certificates generally can be effected only
through DTC, DTC Participants and Indirect DTC Participants. The ability of a
Beneficial Owner to pledge Book-Entry Certificates and the liquidity of the
Book-Entry Certificates in general may be limited due to the lack of a physical
certificate for such Book-Entry Certificates. In addition, Beneficial Owners may
experience delays in their receipt of payments. See "Risk Factors -- Book-Entry
System for Certain Classes and Subclasses of Certificates" and "Description of
the Certificates -- Book-Entry Form" in the Prospectus.
 
    See "Risk Factors" in the Prospectus.
 
                                      S-29
<PAGE>
                        DESCRIPTION OF THE CERTIFICATES
 
DENOMINATIONS
 
    The Offered Certificates, other than the Class A-7, Class A-R and Class A-LR
Certificates, will be issued in minimum denominations of $100,000 initial
principal balance and integral multiples of $1,000 initial principal balance in
excess thereof, except that one of the Class A-2, Class A-3 and Class A-PO
Certificates may be issued in any denomination in excess of $100,000. The Class
A-7 Certificate will be issued as a single Certificate with a denomination of
approximately $3,005,463 initial notional amount. The Class A-R and Class A-LR
Certificates will each be issued as a single Certificate with a denomination of
$50 initial principal balance.
 
DEFINITIVE FORM
 
    Offered Certificates issued in fully registered, certificated form are
referred to herein as "Definitive Certificates." The Class A-7, Class A-PO,
Class A-R, Class A-LR, Class M and Offered Class B Certificates will be issued
as Definitive Certificates. Distributions of principal of, and interest on, the
Definitive Certificates will be made by the Trust Administrator or other paying
agent directly to holders of Definitive Certificates in accordance with the
procedures set forth in the Pooling and Servicing Agreement. The Definitive
Certificates will be transferable and exchangeable at the offices of the Trust
Administrator or other certificate registrar. No service charge will be imposed
for any registration of transfer or exchange, but the Trust Administrator may
require payment of a sum sufficient to cover any tax or other governmental
charge imposed in connection therewith.
 
BOOK-ENTRY FORM
 
    Each Subclass of the Book-Entry Certificates initially will be represented
by one physical certificate registered in the name of Cede & Co. ("Cede"), as
nominee of DTC, which will be the "holder" or "Certificateholder" of such
Certificates, as such terms are used herein. No person acquiring an interest in
the Book-Entry Certificates (a "Beneficial Owner") will be entitled to receive a
Definitive Certificate representing such person's interest in the Book-Entry
Certificates, except as set forth under "Description of the Certificates --
Book-Entry Form" in the Prospectus. Unless and until Definitive Certificates are
issued under the limited circumstances described therein, all references to
actions taken by Certificateholders or holders shall, in the case of the
Book-Entry Certificates, refer to actions taken by DTC upon instructions from
its DTC Participants (as defined under "Description of the Certificates --
Book-Entry Form" in the Prospectus), and all references herein to distributions,
notices, reports and statements to Certificateholders or holders shall, in the
case of the Book-Entry Certificates, refer to distributions, notices, reports
and statements to DTC or Cede, as the registered holder of the Book-Entry
Certificates, as the case may be, for distribution to Beneficial Owners in
accordance with DTC procedures. See "Description of the Certificates --
Book-Entry Form" in the Prospectus.
 
DISTRIBUTIONS
 
    Distributions of interest and in reduction of principal balance to holders
of each Subclass of Class A and Class B Certificates and the Class M
Certificates will be made monthly, to the extent of each Subclass's or Class's
entitlement thereto, on the 25th day of each month or, if such day is not a
business day, on the succeeding business day (each, a "Distribution Date"),
beginning in November 1996. The "Determination Date" with respect to each
Distribution Date will be the 17th day of each month or, if such day is not a
business day, the preceding business day. Distributions will be made on each
Distribution Date to holders of record (which, in the case of the Book-Entry
Certificates, will be Cede, as nominee for DTC) at the close of business on the
last business day of the preceding month (each, a "Record Date"), except that
the final distribution in respect of any Certificate will only be made upon
presentation and surrender of such Certificate at the office or agency appointed
by the Trust Administrator and specified in the notice of final distribution in
respect of such Certificate.
 
    The aggregate amount available for distribution to Certificateholders on
each Distribution Date will be the Pool Distribution Amount. The "Pool
Distribution Amount" for a Distribution Date will be
 
                                      S-30
<PAGE>
the sum of all previously undistributed payments or other receipts on account of
principal (including principal prepayments and Liquidation Proceeds in respect
of principal, if any), and interest on or in respect of the Mortgage Loans
received by the Master Servicer, including without limitation any related
insurance proceeds and the proceeds of any purchase of a related Mortgage Loan
for breach of a representation or warranty or the sale of a Mortgaged Property
by a Servicer in connection with the liquidation of the related Mortgage Loan on
or prior to the Remittance Date in the month in which such Distribution Date
occurs, plus (i) all Periodic Advances made and (ii) all other amounts
(including any insurance proceeds and Compensating Interest) placed in the
Certificate Account by any Servicer on or before the Remittance Date or by the
Master Servicer on or before the Distribution Date pursuant to the Pooling and
Servicing Agreement, but excluding the following:
 
        (a) amounts received as late payments of principal or interest
    respecting which one or more unreimbursed Periodic Advances has been made;
 
        (b) to the extent permitted by the Pooling and Servicing Agreement, that
    portion of Liquidation Proceeds with respect to a Mortgage Loan that
    represents any unreimbursed Periodic Advances of such Servicer;
 
        (c) those portions of each payment of interest on a particular Mortgage
    Loan which represent (i) the applicable Servicing Fee, (ii) the Master
    Servicing Fee and (iii) the Fixed Retained Yield, if any;
 
        (d) all amounts representing scheduled payments of principal and
    interest due after the Due Date occurring in the month in which such
    Distribution Date occurs;
 
        (e) all principal prepayments in full, all partial principal
    prepayments, all proceeds of any Mortgage Loans or property acquired in
    respect thereof, or liquidated pursuant to the Pooling and Servicing
    Agreement, including net Partial Liquidation Proceeds but excluding any Net
    Foreclosure Profits (as defined under "-- Additional Rights of the Class A-R
    Certificateholder" below), and other unscheduled receipts in respect of
    principal of the Mortgage Loans other than proceeds of a repurchase of a
    Mortgage Loan by the Seller or amounts deposited by the Seller in the
    Certificate Account in connection with the substitution of a Mortgage Loan
    (collectively, "Unscheduled Principal Receipts") that were received by the
    Servicers after the Unscheduled Principal Receipt Period (as described under
    "Servicing of the Mortgage Loans -- Unscheduled Principal Receipts" below)
    relating to the Distribution Date for the applicable type of Unscheduled
    Principal Receipt, and all related payments of interest on such amounts;
 
        (f) all repurchase proceeds with respect to Mortgage Loans repurchased
    by the Seller on or following the Due Date in the month in which such
    Distribution Date occurs and the excess of the unpaid principal balance of
    any defective Mortgage Loan for which a Mortgage Loan was substituted over
    the unpaid principal balance of such substituted Mortgage Loan on or
    following the Due Date in the month in which such Distribution Date occurs;
 
        (g) to the extent permitted by the Pooling and Servicing Agreement, that
    portion of Liquidation Proceeds or insurance proceeds with respect to a
    Mortgage Loan or proceeds of any Mortgaged Property that becomes owned by
    the Trustee which represents any unpaid Servicing Fee or Master Servicing
    Fee to which such Servicer or the Master Servicer, respectively, is
    entitled, or which represents unpaid Fixed Retained Yield, and the portion
    of net Liquidation Proceeds used to reimburse any unreimbursed Periodic
    Advances;
 
        (h) all amounts representing certain expenses reimbursable to the Master
    Servicer and other amounts permitted to be retained by the Master Servicer
    or withdrawn by the Master Servicer from the Certificate Account pursuant to
    the Pooling and Servicing Agreement;
 
        (i) reinvestment earnings on payments received in respect of the
    Mortgage Loans or on other amounts on deposit in the Certificate Account;
 
         (j) Net Foreclosure Profits;
 
                                      S-31
<PAGE>
        (k) Month End Interest; and
 
        (l) the amount of any recoveries in respect of principal which had
    previously been allocated as a loss to one or more Subclasses of the Class A
    or Class B Certificates or the Class M Certificates.
 
    The "Remittance Date" with respect to any Distribution Date and any Mortgage
Loan serviced by an Other Servicer will be the 18th day of each month, or if any
such day is not a business day, the preceding business day. The "Remittance
Date" with respect to any Distribution Date and any Mortgage Loan serviced by
Norwest Mortgage will, except as described below under "Servicing of the
Mortgage Loans -- Anticipated Changes in Servicing," be the 24th day of each
month, or if any such day is not a business day, the preceding business day.
 
    "Partial Liquidation Proceeds" are Liquidation Proceeds received by a
Servicer on a Mortgage Loan prior to such Mortgage Loan becoming a Liquidated
Loan and "net Partial Liquidation Proceeds" are Partial Liquidation Proceeds
less expenses incurred with respect to such liquidation.
 
    Each Servicer is required to deposit in the Certificate Account on the
Remittance Date certain amounts in respect of the Mortgage Loans as set forth
herein under "Servicing of the Mortgage Loans -- Custodial Accounts." The Master
Servicer is required to remit to the Trust Administrator on or before the
Distribution Date any payments constituting part of the Pool Distribution Amount
that are received by the Master Servicer or are required to be made with the
Master Servicer's own funds. Except as described below under "Description of the
Certificates -- Periodic Advances," neither the Master Servicer nor the Trust
Administrator is obligated to remit any amounts which a Servicer was required
but failed to deposit in the Certificate Account.
 
    On each Distribution Date, the Pool Distribution Amount will be allocated
among the Classes or Subclasses of Certificates and distributed to the holders
thereof of record as of the related Record Date as follows (the "Pool
Distribution Amount Allocation"):
 
      FIRST, to the Subclasses of Class A Certificates (other than the Class
A-PO Certificates), pro rata based on their respective Class A Subclass Interest
Accrual Amounts, in an aggregate amount up to the sum of the Class A Subclass
Interest Accrual Amounts with respect to such Distribution Date;
 
      SECOND, to the Subclasses of Class A Certificates (other than the Class
A-PO Certificates), pro rata based on their respective unpaid Class A Subclass
Interest Shortfall Amounts, in an aggregate amount up to the sum of the
previously unpaid Class A Subclass Interest Shortfall Amounts;
 
      THIRD, concurrently, pro rata to the Class A Certificates (other than the
Class A-PO Certificates), based on the Class A Non-PO Optimal Principal Amount,
and the Class A-PO Certificates, based on the Class A-PO Optimal Principal
Amount, (A) to the Subclasses of Class A Certificates (other than the Class A-PO
Certificates) in an aggregate amount up to the Class A Non-PO Optimal Principal
Amount, such distribution to be allocated among such Subclasses in accordance
with the priorities set forth below under "-- Principal (Including Prepayments)
- -- Allocation of Amount to be Distributed" and (B) to the Class A-PO
Certificates in an amount up to the Class A-PO Optimal Principal Amount;
 
      FOURTH, to the Class A-PO Certificates in an amount up to the Class A-PO
Deferred Amount, but only, first from amounts otherwise distributable (without
regard to this priority) to the Subclasses of Class B Certificates pursuant to
priorities FOURTEENTH clause (C), THIRTEENTH and TENTH of this Pool Distribution
Amount Allocation and then from amounts otherwise distributable (without regard
to this priority) to the Class M Certificates pursuant to priority SEVENTH of
this Pool Distribution Amount Allocation;
 
      FIFTH, to the Class M Certificates in an amount up to the Class M Interest
Accrual Amount with respect to such Distribution Date;
 
                                      S-32
<PAGE>
      SIXTH, to the Class M Certificates in an amount up to the sum of the
previously unpaid Class M Interest Shortfall Amounts;
 
      SEVENTH, to the Class M Certificates in an amount up to the Class M
Optimal Principal Amount; provided, however, that the amount distributable
pursuant to this priority SEVENTH to the Class M Certificates will be reduced by
the amount, if any, otherwise distributable as principal hereunder used to pay
the Class A-PO Deferred Amount in accordance with priority FOURTH;
 
      EIGHTH, to the Class B-1 Certificates in an amount up to the Class B
Subclass Interest Accrual Amount for such Subclass with respect to such
Distribution Date;
 
      NINTH, to the Class B-1 Certificates in an amount up to the sum of the
previously unpaid Class B Subclass Interest Shortfall Amounts for such Subclass;
 
      TENTH, to the Class B-1 Certificates in an amount up to the Subclass B
Optimal Principal Amount for such Subclass; provided, however, that the amount
distributable pursuant to this priority TENTH will be reduced by the amount, if
any, otherwise distributable as principal hereunder used to pay the Class A-PO
Deferred Amount in accordance with priority FOURTH;
 
      ELEVENTH, to the Class B-2 Certificates in an amount up to the Class B
Subclass Interest Accrual Amount for such Subclass with respect to such
Distribution Date;
 
      TWELFTH, to the Class B-2 Certificates in an amount up to the sum of the
previously unpaid Class B Subclass Interest Shortfall Amounts for such Subclass;
 
      THIRTEENTH, to the Class B-2 Certificates in an amount up to the Subclass
B Optimal Principal Amount for such Subclass; provided, however, that the amount
distributable pursuant to this priority THIRTEENTH will be reduced by the
amount, if any, otherwise distributable as principal hereunder used to pay the
Class A-PO Deferred Amount in accordance with priority FOURTH; and
 
      FOURTEENTH, sequentially, to the Class B-3, Class B-4 and Class B-5
Certificates so that each such Subclass shall receive (A) an amount up to its
Class B Subclass Interest Accrual Amount with respect to such Distribution Date,
(B) then, an amount up to its previously unpaid Class B Subclass Interest
Shortfall Amounts and (C) an amount up to its Subclass B Optimal Principal
Amount before any Subclasses of Class B Certificates with higher numerical
designations receive any payments in respect of interest or principal; provided,
however, that the amount distributable pursuant to this priority FOURTEENTH
clause (C) to any Subclasses of Class B Certificates will be reduced by the
amount, if any, otherwise distributable as principal hereunder used to pay the
Class A-PO Deferred Amount in accordance with priority FOURTH.
 
    The "Class A Non-PO Distribution Amount" for any Distribution Date will be
equal to the sum of the amounts distributed in accordance with priorities FIRST,
SECOND and THIRD clause (A) of the Pool Distribution Amount Allocation set forth
above.
 
    The "Class M Distribution Amount" for any Distribution Date will be equal to
the sum of the amounts distributed in accordance with priorities FIFTH through
SEVENTH of the Pool Distribution Amount Allocation set forth above.
 
    The "Class B Subclass Distribution Amount" for any Distribution Date and the
Class B-1 or Class B-2 Certificates will be equal to the sum of the amounts
distributed in accordance with priorities EIGHTH through TENTH of the Pool
Distribution Amount Allocation set forth above with respect to the Class B-1
Certificates and priorities ELEVENTH through THIRTEENTH of the Pool Distribution
Amount Allocation set forth above with respect to the Class B-2 Certificates.
 
    The undivided percentage interest (the "Percentage Interest") represented by
any Offered Certificate of a Subclass or Class in distributions to such Subclass
or Class will be equal to the percentage obtained by dividing the initial
principal balance of such Certificate (or initial notional amount in the case of
the Class A-7 Certificate) by the aggregate initial principal balance (or
notional amount) of all Certificates of such Subclass or Class, as the case may
be.
 
                                      S-33
<PAGE>
INTEREST
 
    The amount of interest that will accrue on each Subclass of Class A
Certificates, other than the Class A-PO Certificates, during each month, after
taking into account any Non-Supported Interest Shortfalls and the interest
portion of certain losses allocated to such Subclass, is referred to herein as
the "Class A Subclass Interest Accrual Amount" for such Subclass. The Class A
Subclass Interest Accrual Amount for each Subclass of Class A Certificates,
other than the Class A-PO Certificates, will equal the difference between (a)
the product of (i) 1/12th of the Pass-Through Rate for such Subclass and (ii)
the outstanding Class A Subclass Principal Balance of such Subclass or, in the
case of the Class A-7 Certificate, the outstanding Class A-7 Notional Amount,
and (b) the sum of (i) any Non-Supported Interest Shortfall allocable to such
Subclass, (ii) the interest portion of any Excess Special Hazard Losses, Excess
Fraud Losses and Excess Bankruptcy Losses allocable to such Subclass and (iii)
the interest portion of any Realized Losses, other than the interest portion of
any Excess Special Hazard Losses, Excess Fraud Losses and Excess Bankruptcy
Losses, allocable to such Subclass on or after the Cross-Over Date. The
pass-through rate for each Subclass of Class A Certificates, other than the
Class A-PO Certificates (the "Pass-Through Rate"), is the percentage set forth
on the cover of this Prospectus Supplement.
 
    The Class A-7 Certificate is an interest-only certificate and has no
principal balance. The "Class A-7 Notional Amount" with respect to each
Distribution Date will be equal to approximately 5.556% of the Class A Subclass
Principal Balance of the Class A-2 Certificates. Accordingly, any distributions
in respect of principal made to, or losses in respect of principal allocated in
reduction of, the Class A Subclass Principal Balance of the Class A-2
Certificates will result in a proportional reduction in the Class A-7 Notional
Amount. See "--Principal (Including Prepayments)" and "-- Subordination of Class
M and Class B Certificates--Allocation of Losses" herein. The Class A-7 Notional
Amount with respect to the first Distribution Date will be approximately
$3,005,463.
 
    No interest will accrue on the Class A-PO Certificates.
 
    The amount of interest that will accrue on the Class M Certificates during
each month, after taking into account any Non-Supported Interest Shortfalls and
the interest portion of certain losses allocated to such Class, is referred to
herein as the "Class M Interest Accrual Amount." The Class M Interest Accrual
Amount will equal the difference between (a) the product of (i) 1/12th of 7.50%
and (ii) the outstanding Class M Principal Balance and (b) the sum of (i) any
Non-Supported Interest Shortfall allocable to such Class and (ii) the interest
portion of any Excess Special Hazard Losses, Excess Fraud Losses and Excess
Bankruptcy Losses allocable to such Class.
 
    The amount of interest that will accrue on each Subclass of Class B
Certificates during each month, after taking into account any Non-Supported
Interest Shortfalls and the interest portion of certain losses allocated to such
Subclass, is referred to herein as the "Class B Subclass Interest Accrual
Amount." The Class B Subclass Interest Accrual Amount will equal the difference
between (a) the product of (i) 1/12th of 7.50% and (ii) the outstanding Class B
Subclass Principal Balance and (b) the sum of (i) any Non-Supported Interest
Shortfall allocable to such Subclass and (ii) the interest portion of any Excess
Special Hazard Losses, Excess Fraud Losses and Excess Bankruptcy Losses
allocable to such Subclass.
 
    The "Class A Subclass Principal Balance" of a Subclass of Class A
Certificates (other than the Class A-PO Certificates) as of any Determination
Date will be the principal balance of such Subclass on the date of initial
issuance of the Class A Certificates, less (i) all amounts previously
distributed to holders of Certificates of such Subclass in reduction of the
principal balance of such Subclass and (ii) such Subclass's pro rata share of
the principal portion of Excess Special Hazard Losses, Excess Fraud Losses and
Excess Bankruptcy Losses allocated through such Determation Date to the holders
of Class A Certificates (other than the Class A-PO Certificates) in the manner
described herein under "-- Subordination of Class M and Class B Certificates --
Allocation of Losses." After the Cross-Over Date, the Class A Subclass Principal
Balance of a Subclass of Class A Certificates (other than the Class A-PO
Certificates) may be subject to further reduction in an amount equal to such
Subclass's pro rata
 
                                      S-34
<PAGE>
share of the difference, if any, between (a) the Class A Non-PO Principal
Balance as of such Determination Date without regard to this provision and (b)
the difference between (i) the Adjusted Pool Amount for the preceding
Distribution Date and (ii) the Adjusted Pool Amount (PO Portion) for the
preceding Distribution Date. Any pro rata allocation among the Subclasses of
Class A Certificates described in this paragraph will be made among the
Subclasses of Class A Certificates (other than the Class A-PO Certificates) on
the basis of their then-outstanding Class A Subclass Principal Balances.
 
    The "Class A Subclass Principal Balance" of the Class A-PO Certificates as
of any Determination Date will be the principal balance of such Subclass on the
date of initial issuance of the Class A Certificates less (i) all amounts
previously distributed to the holders of the Class A-PO Certificates pursuant to
priorities THIRD clause (B) and FOURTH of the Pool Distribution Amount
Allocation and (ii) the principal portion of Excess Special Hazard Losses,
Excess Fraud Losses and Excess Bankruptcy Losses allocated through such
Determination Date to the Class A-PO Certificates in the manner described herein
under "-- Subordination of Class M and Class B Certificates -- Allocation of
Losses." After the Cross-Over Date, the Class A Subclass Principal Balance of
the Class A-PO Certificates will be subject to further reduction in an amount
equal to the excess, if any, of (a) the Class A Subclass Principal Balance of
the Class A-PO Certificates as of such Determination Date without regard to this
provision over (b) the Adjusted Pool Amount (PO Portion) for the preceding
Distribution Date.
 
    The "Class A Principal Balance" as of any Determination Date will be equal
to the sum of the Class A Subclass Principal Balances of the Subclasses of Class
A Certificates as of such date.
 
    The "Class A Non-PO Principal Balance" as of any Determination Date will be
equal to the sum of the Class A Subclass Principal Balances of the Subclasses of
Class A Certificates (other than the Class A-PO Certificates).
 
    The "Class M Principal Balance" as of any Determination Date will be the
lesser of (a) the principal balance of the Class M Certificates on the date of
initial issuance of the Class M Certificates less (i) all amounts previously
distributed to holders of the Class M Certificates in reduction of the principal
balance thereof and (ii) the principal portion of Excess Special Hazard Losses,
Excess Fraud Losses and Excess Bankruptcy Losses allocated through such
Determination Date to the holders of the Class M Certificates in the manner
described herein under "-- Subordination of Class M and Class B Certificates --
Allocation of Losses" and (b) the Adjusted Pool Amount as of the preceding
Distribution Date less the Class A Principal Balance as of such Determination
Date.
 
    The "Class B Subclass Principal Balance" of a Subclass of Class B
Certificates as of any Determination Date will be the lesser of (a) the
principal balance of such Subclass on the date of initial issuance of the Class
B Certificates less (i) all amounts previously distributed to holders of such
Subclass in reduction of the principal balance thereof and (ii) the principal
portion of Excess Special Hazard Losses, Excess Fraud Losses and Excess
Bankruptcy Losses allocated through such Determination Date to the holders of
such Subclass in the manner described under "-- Subordination of Class M and
Class B Certificates -- Allocation of Losses" and (b) the Adjusted Pool Amount
as of the preceding Distribution Date less the sum of (i) the Class A Principal
Balance, (ii) the Class M Principal Balance and (iii) the Class B Subclass
Principal Balances of the Subclasses of Class B Certificates with lower
numerical designations, each as of such Determination Date.
 
    The "Class B Principal Balance" as of any date will be equal to the sum of
the Class B Subclass Principal Balances of the Subclasses of Class B
Certificates as of such date.
 
    With respect to any Distribution Date, the "Adjusted Pool Amount" will equal
the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans minus the sum
of (i) all amounts in respect of principal received in respect of the Mortgage
Loans (including amounts received as Periodic Advances, principal prepayments
and Liquidation Proceeds in respect of principal) and distributed to holders of
 
                                      S-35
<PAGE>
the Series 1996-7 Certificates on such Distribution Date and all prior
Distribution Dates and (ii) the principal portion of all Realized Losses (other
than Debt Service Reductions) incurred on the Mortgage Loans from the Cut-Off
Date through the end of the month preceding such Distribution Date.
 
    With respect to any Distribution Date, the "Adjusted Pool Amount (PO
Portion)" will equal the sum as to each Mortgage Loan outstanding at the Cut-Off
Date of the product of (A) the PO Fraction for such Mortgage Loan and (B) the
principal balance of such Mortgage Loan as of the Cut-Off Date less the sum of
(i) all amounts in respect of principal received in respect of such Mortgage
Loan (including amounts received as Periodic Advances, principal prepayments and
Liquidation Proceeds in respect of principal) and distributed to holders of the
Series 1996-7 Certificates on such Distribution Date and all prior Distribution
Dates and (ii) the principal portion of any Realized Loss (other than a Debt
Service Reduction) incurred on such Mortgage Loan from the Cut-Off Date through
the end of the month preceding the month in which such Distribution Date occurs.
 
    The "Net Mortgage Interest Rate" on each Mortgage Loan will be equal to the
Mortgage Interest Rate on such Mortgage Loan as stated in the related mortgage
note minus the sum of (i) the Servicing Fee Rate of 0.25% per annum, (ii) the
Master Servicing Fee Rate and (iii) the Fixed Retained Yield rate, if any, for
such Mortgage Loan. See "Servicing of the Mortgage Loans -- Fixed Retained
Yield; Servicing Compensation and Payment of Expenses" herein.
 
    When mortgagors prepay principal, or when principal is recovered through
foreclosure sales or other liquidations of defaulted Mortgage Loans, or when
other Unscheduled Principal Receipts occur, a full month's interest for the
month of payment or recovery may not be paid or recovered, resulting in interest
shortfalls to the extent that such payment or recovery is not included in the
distribution to Certificateholders made in the month in which it is received.
Interest shortfalls resulting from principal prepayments in full made by
mortgagors ("Prepayments in Full") are referred to herein as "Prepayment
Interest Shortfalls." The Master Servicer will be obligated, on or before each
Distribution Date, to pay to the Trust Administrator for the benefit of
Certificateholders, from the Master Servicer's own funds (including amounts
otherwise payable to the Master Servicer in respect of such Distribution Date as
Master Servicing Fees) an amount (such amount, "Compensating Interest") equal to
the lesser of (i) the aggregate Prepayment Interest Shortfall with respect to
such Distribution Date and (ii) the lesser of (X) the product of (A) 1/12th of
0.20% and (B) the Pool Scheduled Principal Balance for such Distribution Date
and (Y) the Available Master Servicing Compensation for such Distribution Date.
 
    The "Available Master Servicing Compensation" for any Distribution Date will
be equal to the sum of (a) the Master Servicing Fee for such Distribution Date,
(b) interest earned through the business day preceding the applicable
Distribution Date on any Prepayments in Full remitted to the Master Servicer and
deposited in the Certificate Account (which amount of interest with respect to
Prepayments in Full on the Mortgage Loans serviced by Norwest Mortgage is
expected to be zero unless the Remittance Date for such Mortgage Loans changes
as described below under "Servicing of the Mortgage Loans -- Anticipated Changes
in Servicing") and (c) the aggregate amount of Month End Interest remitted by
the Servicers to the Master Servicer pursuant to the related Underlying
Servicing Agreements. With respect to the Mortgage Loans serviced by Norwest
Mortgage, "Month End Interest" for each Distribution Date will be equal to the
lesser of (i) the aggregate Prepayment Interest Shortfalls with respect to the
Mortgage Loans serviced by Norwest Mortgage and (ii) the product of 1/12th of
0.20% and the aggregate scheduled principal balance (as determined in the
applicable Underlying Servicing Agreement) of the Mortgage Loans serviced by
Norwest Mortgage. With respect to the Mortgage Loans serviced by each Other
Servicer, "Month End Interest" for each Distribution Date will be equal to the
lesser of (i) the sum of the aggregate Prepayment Interest Shortfalls and
aggregate Curtailment Interest Shortfalls with respect to the Mortgage Loans
serviced by such Other Servicer and (ii) the sum of (X) the product of 1/12th of
0.25% and the aggregate scheduled principal balance (as determined in the
applicable Underlying Servicing Agreement) of the Mortgage Loans serviced by
such Other Servicer and (Y) reinvestment earnings on payments received in
respect of the Mortgage Loans or on other amounts on deposit in the related
Servicer Custodial
 
                                      S-36
<PAGE>
Account pursuant to the related Underlying Servicing Agreement on such
Distribution Date (other than with respect to the Mortgage Loans serviced by
Countrywide Home Loans, Inc.). As described below under "Servicing of the
Mortgage Loans -- Anticipated Changes in Servicing," any or all of the Servicers
may be required to begin to remit to the Master Servicer Unscheduled Principal
Receipts in full for deposit into the Certificate Account daily on a specified
business day following receipt thereof which will generally result in a deposit
earlier than on the following Remittance Date and, in conjunction therewith, may
be relieved of its obligation to remit Month End Interest. Any such change may
have an impact on the amount of Compensating Interest by increasing the amount
described in clause (b) of the definition of Available Master Servicing
Compensation and decreasing the amount described in clause (c) of the definition
thereof. No assurance can be given as to the timing of any such changes or that
any such changes will occur.
 
    As to any Distribution Date, Prepayment Interest Shortfalls to the extent
that they exceed Compensating Interest are referred to herein as "Non-Supported
Interest Shortfalls" and will be allocated to (i) the Class A Certificates
(other than the Class A-PO Certificates) according to the percentage obtained by
dividing the then-outstanding Class A Non-PO Principal Balance by the sum of the
then-outstanding Class A Non-PO Principal Balance, Class M Principal Balance and
Class B Principal Balance, (ii) the Class M Certificates according to the
percentage obtained by dividing the then-outstanding Class M Principal Balance
by the sum of the then-outstanding Class A Non-PO Principal Balance, Class M
Principal Balance and Class B Principal Balance and (iii) the Class B
Certificates according to the percentage obtained by dividing the
then-outstanding Class B Principal Balance by the sum of the then-outstanding
Class A Non-PO Principal Balance, Class M Principal Balance and Class B
Principal Balance. Such allocation of the Non-Supported Interest Shortfall will
reduce the amount of interest due to be distributed to holders of the Class A
Certificates then entitled to distributions in respect of interest. Such
allocation of the Non-Supported Interest Shortfall will also reduce the amount
of interest due to be distributed to the holders of the Class M Certificates and
the Class B Certificates. Any such reduction in respect of interest allocated to
the Class A Certificates or Class B Certificates will be allocated among such
Subclasses of Class A or Class B Certificates, as the case may be, pro rata on
the basis of their respective Class A Subclass Interest Accrual Amount or Class
B Subclass Interest Accrual Amount, without regard to any reduction pursuant to
this paragraph, for such Distribution Date.
 
    Any interest shortfalls arising from Unscheduled Principal Receipts in full
that are not Prepayments in Full and any interest shortfalls resulting from the
timing of the receipt of partial principal prepayments by mortgagors
("Curtailment Interest Shortfalls") or of other partial Unscheduled Principal
Receipts with respect to the Mortgage Loans will not be offset by Compensating
Interest, but instead will be borne first by the Subclasses of Class B
Certificates in reverse numerical order, second by the Class M Certificates, and
then, pro rata by the Class A Certificates (other than the Class A-PO
Certificates) based on interest accrued. See "Description of the Certificates --
Subordination of Class M and Class B Certificates" herein. After the Cross-Over
Date all interest shortfalls arising from Unscheduled Principal Receipts, other
than Prepayment Interest Shortfalls covered by Compensating Interest, will be
treated as Non-Supported Interest Shortfalls and allocated in reduction of
interest accrued on the Class A Certificates.
 
    The interest portion of any Excess Special Hazard Losses, Excess Fraud
Losses or Excess Bankruptcy Losses will be allocated among the Class A, Class M
and Class B Certificates pro rata based on the interest accrued on each such
Class and among the Subclasses of Class A Certificates (other than the Class
A-PO Certificates) or Class B Certificates, as the case may be, pro rata on the
basis of their respective Class A Subclass Interest Accrual Amounts or Class B
Subclass Interest Accrual Amounts, without regard to any reduction pursuant to
this paragraph, for such Distribution Date.
 
    Allocations of the interest portion of Realized Losses (other than Excess
Special Hazard Losses, Excess Fraud Losses or Excess Bankruptcy Losses) first to
the Subclasses of Class B Certificates in
 
                                      S-37
<PAGE>
reverse numerical order and then to the Class M Certificates will result from
the priority of distributions first to the holders of the Class A Certificates,
second to the holders of the Class M Certificates and finally to the holders of
the Subclasses of Class B Certificates in numerical order of the Pool
Distribution Amount as described above under "Description of the Certificates --
Distributions."
 
    On each Distribution Date on which the Pool Distribution Amount equals or
exceeds the sum of the Class A Subclass Interest Accrual Amounts, distributions
in respect of interest to each Subclass of Class A Certificates will equal such
Subclass's Class A Subclass Interest Accrual Amount.
 
    If, on any Distribution Date, the Pool Distribution Amount is less than the
sum of the Class A Subclass Interest Accrual Amounts, the amount of interest
currently distributed on the Class A Certificates will equal the Pool
Distribution Amount and will be allocated among the Subclasses of Class A
Certificates (other than the Class A-PO Certificates) pro rata in accordance
with each such Subclass's Class A Subclass Interest Accrual Amount. Amounts so
allocated will be distributed in respect of interest to each such Subclass of
Class A Certificates. Any difference between the portion of the Pool
Distribution Amount distributed in respect of current interest to each such
Subclass of Class A Certificates and the Class A Subclass Interest Accrual
Amount for such Subclass with respect to the related Distribution Date (as to
each such Subclass, the "Class A Subclass Interest Shortfall Amount") will be
added to the amount to be distributed on subsequent Distribution Dates to such
Subclass, but only so long as it is outstanding, to the extent that the Pool
Distribution Amount is sufficient therefor. No interest will accrue on the
unpaid Class A Subclass Interest Shortfall Amounts.
 
    On each Distribution Date on which the Pool Distribution Amount exceeds the
sum of the Class A Subclass Interest Accrual Amounts, any excess will then be
allocated first to pay previously unpaid Class A Subclass Interest Shortfall
Amounts. Such amounts will be allocated among the Subclasses of Class A
Certificates (other than the Class A-PO Certificates) pro rata in accordance
with the respective unpaid Class A Subclass Interest Shortfall Amounts
immediately prior to such Distribution Date.
 
    On each Distribution Date on which the Pool Distribution Amount equals or
exceeds the sum for such Distribution Date of (A) the sum of (i) the sum of the
Class A Subclass Interest Accrual Amounts with respect to the Subclasses of
Class A Certificates, (ii) the sum of the unpaid Class A Subclass Interest
Shortfall Amounts with respect to the Subclasses of Class A Certificates and
(iii) the Class A Non-PO Optimal Principal Amount (collectively with the amounts
described in clauses (i) and (ii), the "Class A Non-PO Optimal Amount"), (B) the
Class A-PO Optimal Principal Amount (collectively with the amount described in
clause (A), the "Class A Optimal Amount") and (C) the Class M Interest Accrual
Amount, distributions in respect of current interest to the Class M Certificates
will equal the Class M Interest Accrual Amount.
 
    If, on any Distribution Date, the Pool Distribution Amount is less than the
sum of (i) the Class A Optimal Amount and (ii) the Class M Interest Accrual
Amount, the amount of current interest distributed on the Class M Certificates
will equal the Pool Distribution Amount minus the amounts distributed to the
Class A Certificates with respect to such Distribution Date. Any difference
between the portion of the Pool Distribution Amount distributed in respect of
current interest to the Class M Certificates and the Class M Interest Accrual
Amount with respect to such Distribution Date (the "Class M Interest Shortfall
Amount") will be added to the amount to be distributed on subsequent
Distribution Dates to the Class M Certificates, but only so long as they are
outstanding, to the extent that the Pool Distribution Amount is sufficient
therefor. No interest will accrue on the unpaid Class M Interest Shortfall
Amount.
 
    Subject to the payment of any Class A-PO Deferred Amount, on each
Distribution Date on which the Pool Distribution Amount exceeds the sum of the
Class A Optimal Amount and the Class M Interest Accrual Amount, any excess will
be allocated first to pay previously unpaid Class M Interest Shortfall Amounts
and then to make distributions in respect of principal on the Class M
Certificates. With respect to each Distribution Date, the "Class M Optimal
Amount" will equal the sum of (i) the Class M Interest Accrual Amount, (ii) the
unpaid Class M Interest Shortfall Amount and (iii) the Class M Optimal Principal
Amount.
 
                                      S-38
<PAGE>
    On each Distribution Date on which the Pool Distribution Amount equals or
exceeds the sum of (i) the Class B Subclass Interest Accrual Amount for a
particular Subclass of Class B Certificates and (ii) all amounts senior in
priority to such Class B Subclass Interest Accrual Amount as set forth in the
Pool Distribution Amount Allocation, the distribution in respect of current
interest to such Subclass of Class B Certificates will equal such Subclass's
Class B Subclass Interest Accrual Amount.
 
    If on any Distribution Date, the Pool Distribution Amount is less than the
sum of (i) the Class B Subclass Interest Accrual Amount for a particular
Subclass of Class B Certificates and (ii) all amounts senior in priority to such
Class B Subclass Interest Accrual Amount based on the priorities in the Pool
Distribution Amount Allocation, the amount of current interest distributed on
such Subclass of Class B Certificates will equal the Pool Distribution Amount
less all amounts senior in priority to such Class B Subclass Interest Accrual
Amount as set forth in the Pool Distribution Amount Allocation. Any difference
between the amount distributed in respect of current interest to such Subclass
of Class B Certificates and the Class B Subclass Interest Accrual Amount for
such Subclass with respect to the related Distribution Date (as to such
Subclass, the "Class B Subclass Interest Shortfall Amount") will be added to the
amount to be distributed on subsequent Distribution Dates to such Subclass, but
only so long as it is outstanding, to the extent the Pool Distribution Amount is
sufficient therefor. No interest will accrue on such Class B Subclass Interest
Shortfall Amount.
 
    For a particular Subclass of Class B Certificates, subject to the payment of
any Class A-PO Deferred Amount, on each Distribution Date on which the Pool
Distribution Amount exceeds the sum of the Class A Optimal Amount, the Class M
Optimal Amount, the Subclass B Optimal Amount for each Subclass of Class B
Certificates with a lower numerical designation and the Class B Subclass
Interest Accrual Amount for such Subclass, any excess will be allocated first to
pay previously unpaid Class B Subclass Interest Shortfall Amounts of such
Subclass and then to make distributions in respect of principal on such
Subclass. With respect to each Distribution Date, the "Subclass B Optimal
Amount" for any Subclass of Class B Certificates will equal the sum of (i) the
Class B Subclass Interest Accrual Amount, (ii) the unpaid Class B Subclass
Interest Shortfall Amounts and (iii) the Subclass B Optimal Principal Amount.
 
    On any Distribution Date on which the Pool Distribution Amount is less than
the Class A Optimal Amount, the Class M Certificates and the Subclasses of Class
B Certificates will not be entitled to any distributions of interest or
principal.
 
PRINCIPAL (INCLUDING PREPAYMENTS)
 
    The principal balance of a Class A or Class B Certificate of any Subclass or
of any Class M Certificate at any time is equal to the product of the Class A
Subclass Principal Balance or Class B Subclass Principal Balance of such
Subclass or the Class M Principal Balance, as the case may be, and such
Certificate's Percentage Interest, and represents the maximum specified dollar
amount (exclusive of (i) any interest that may accrue on such Class A, Class M
or Class B Certificate and (ii) in the case of the Class A-R Certificate, any
additional amounts to which the holder of such Certificate may be entitled as
described below under "-- Additional Rights of the Class A-R Certificateholder")
to which the holder thereof is entitled from the cash flow on the Mortgage Loans
at such time, and will decline to the extent of distributions in reduction of
the principal balance of, and allocations of losses to, such Certificate. The
approximate initial Class A Subclass Principal Balance or Class B Subclass
Principal Balance of each Subclass of Class A and Offered Class B Certificates
(other than the Class A-7 Certificate) and the approximate initial Class M
Principal Balance are set forth on the cover of this Prospectus Supplement. The
Class A-7 Certificate will have no Class A Subclass Principal Balance.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS A CERTIFICATES (OTHER
THAN THE CLASS A-PO CERTIFICATES)
 
    Distributions in reduction of the principal balance of the Class A
Certificates (other than the Class A-PO Certificates) will be made on each
Distribution Date pursuant to priority THIRD clause (A) of the Pool Distribution
Amount Allocation, in an aggregate amount (the "Class A Non-PO
 
                                      S-39
<PAGE>
Principal Distribution Amount") equal to the amount distributed pursuant to
priority THIRD clause (A) of the Pool Distribution Amount Allocation, in an
aggregate amount up to the Class A Non-PO Optimal Principal Amount.
 
    The "Class A Non-PO Optimal Principal Amount" with respect to each
Distribution Date will be an amount equal to the sum for each outstanding
Mortgage Loan (including each defaulted Mortgage Loan, other than a Liquidated
Loan, with respect to which the related Mortgaged Property has been acquired by
the Trust Estate) of the product of (A) the Non-PO Fraction for such Mortgage
Loan and (B) the sum of:
 
    (i) the Class A Percentage of (A) the scheduled payment of principal due on
       such Mortgage Loan on the first day of the month in which the
       Distribution Date occurs, less (B) if the Bankruptcy Loss Amount is zero,
       the principal portion of Debt Service Reductions with respect to such
       Mortgage Loan,
 
    (ii) the Class A Prepayment Percentage of all Unscheduled Principal Receipts
       that were received by a Servicer with respect to such Mortgage Loan
       during the Unscheduled Principal Receipt Period relating to such
       Distribution Date for each applicable type of Unscheduled Principal
       Receipt,
 
    (iii) the Class A Prepayment Percentage of the Scheduled Principal Balance
       of such Mortgage Loan which, during the month preceding the month of such
       Distribution Date was repurchased by the Seller, as described under the
       heading "Description of the Mortgage Loans -- Mandatory Repurchase or
       Substitution of Mortgage Loans" herein, and
 
    (iv) the Class A Percentage of the excess of the unpaid principal balance of
       any defective Mortgage Loan for which a Mortgage Loan was substituted
       during the month preceding the month in which such Distribution Date
       occurs over the unpaid principal balance of such substituted Mortgage
       Loan, less the amount allocable to the principal portion of any
       unreimbursed advances in respect of such defective Mortgage Loan. See
       "The Pooling and Servicing Agreement -- Assignment of the Mortgage Loans
       to the Trustee" in the Prospectus.
 
    In addition, in the event that there is any recovery of an amount in respect
of principal which had previously been allocated as a Realized Loss to the Class
A Certificates (other than the Class A-PO Certificates) each Subclass of Class A
Certificates, for so long as its principal balance has not been reduced to zero,
will be entitled to its pro rata share of such recovery in an amount up to the
amount by which the Class A Subclass Principal Balance of such Subclass was
reduced as a result of such Realized Loss.
 
    The "Non-PO Fraction" with respect to any Mortgage Loan will equal the Net
Mortgage Interest Rate for such Mortgage Loan divided by 7.50%.
 
    The "Scheduled Principal Balance" of a Mortgage Loan as of any Distribution
Date is the unpaid principal balance of such Mortgage Loan as specified in the
amortization schedule at the time relating thereto (before any adjustment to
such schedule by reason of bankruptcy (other than Deficient Valuations),
moratorium or similar waiver or grace period) as of the Due Date occurring in
the month preceding the month in which such Distribution Date occurs, after
giving effect to any principal prepayments or other unscheduled recoveries of
principal previously received, to any partial principal prepayments and
Deficient Valuations occurring prior to such Due Date, to the payment of
principal due on such Due Date irrespective of any delinquency in payment by the
mortgagor and to any Unscheduled Principal Receipts received or applied during
the applicable Unscheduled Principal Receipt Period for the Distribution Date in
the month preceding such Distribution Date.
 
    A "Realized Loss" is any Liquidated Loan Loss (including any Special Hazard
Loss and any Fraud Loss) or any Bankruptcy Loss. A "Liquidated Loan" is a
defaulted Mortgage Loan as to which the Servicer has determined that all
recoverable liquidation and insurance proceeds have been received. A
 
                                      S-40
<PAGE>
"Liquidated Loan Loss" on a Liquidated Loan is equal to the excess, if any, of
(i) the unpaid principal balance of such Liquidated Loan, plus accrued interest
thereon in accordance with the amortization schedule at the Net Mortgage
Interest Rate through the last day of the month in which such Mortgage Loan was
liquidated, over (ii) net Liquidation Proceeds. For purposes of calculating the
amount of any Liquidated Loan Loss, all net Liquidation Proceeds (after
reimbursement of any previously unreimbursed Periodic Advance) will be applied
first to accrued interest and then to the unpaid principal balance of the
Liquidated Loan. A "Special Hazard Loss" is (A) a Liquidated Loan Loss suffered
by a Mortgaged Property on account of direct physical loss exclusive of (i) any
loss covered by a standard hazard insurance policy or, if the Mortgaged Property
is located in an area identified in the Federal Register by the Federal
Emergency Management Agency as having special flood hazards, a flood insurance
policy, of the types described in the Prospectus under "The Trust Estates --
Mortgage Loans -- Insurance Policies" and (ii) any loss caused by or resulting
from (a) normal wear and tear, (b) dishonest acts of the Trustee, the Trust
Administrator, the Master Servicer or the Servicer or (c) errors in design,
faulty workmanship or faulty materials, unless the collapse of the property or a
part thereof ensues or (B) a Liquidated Loan Loss arising from or relating to
the presence or suspected presence of hazardous wastes or substances on a
Mortgaged Property. A "Fraud Loss" is a Liquidated Loan Loss incurred on a
Liquidated Loan as to which there was fraud in the origination of such Mortgage
Loan. A "Bankruptcy Loss" is a Debt Service Reduction or a Deficient Valuation.
A "Debt Service Reduction" means a reduction in the amount of monthly payments
due to certain bankruptcy proceedings, but does not include any permanent
forgiveness of principal. A "Deficient Valuation" with respect to a Mortgage
Loan means a valuation by a court of the Mortgaged Property in an amount less
than the outstanding indebtedness under the Mortgage Loan or any reduction in
the amount of monthly payments that results in a permanent forgiveness of
principal, which valuation or reduction results from a bankruptcy proceeding.
 
    The "Class A Percentage" for any Distribution Date occurring on or prior to
the Cross-Over Date is the percentage (subject to rounding), which in no event
will exceed 100%, obtained by dividing the Class A Non-PO Principal Balance as
of such date (before taking into account distributions in reduction of principal
balance on such date) by the Pool Balance (Non-PO Portion). The "Pool Balance
(Non-PO Portion)" is the sum for each outstanding Mortgage Loan of the product
of (i) the Non-PO Fraction for such Mortgage Loan and (ii) the Scheduled
Principal Balance of such Mortgage Loan as of such Distribution Date. The Class
A Percentage for the first Distribution Date will be approximately 96.19%. The
Class A Percentage will decrease as a result of the allocation of certain
unscheduled payments in respect of principal according to the Class A Prepayment
Percentage for a specified period to the Class A Certificates (other than the
Class A-PO Certificates) and will increase as a result of the allocation of
Realized Losses to the Class M and Class B Certificates. The Class A Percentage
for each Distribution Date occurring after the Cross-Over Date will be 100%.
 
    The "Class A Prepayment Percentage" for any Distribution Date will be the
percentage indicated below:
 
<TABLE>
<CAPTION>
DISTRIBUTION DATE OCCURRING IN                                         CLASS A PREPAYMENT PERCENTAGE
- ---------------------------------------------------------  ------------------------------------------------------
<S>                                                        <C>
November 1996 through October 2001.......................  100%;
November 2001 through October 2002.......................  the Class A Percentage, plus 70% of the Subordinated
                                                            Percentage;
November 2002 through October 2003.......................  the Class A Percentage, plus 60% of the Subordinated
                                                            Percentage;
November 2003 through October 2004.......................  the Class A Percentage, plus 40% of the Subordinated
                                                            Percentage;
November 2004 through October 2005.......................  the Class A Percentage, plus 20% of the Subordinated
                                                            Percentage; and
November 2005 and thereafter.............................  the Class A Percentage;
</TABLE>
 
    PROVIDED, HOWEVER, that if on any of the foregoing Distribution Dates the
Class A Percentage exceeds the initial Class A Percentage, the Class A
Prepayment Percentage for such Distribution Date
 
                                      S-41
<PAGE>
will once again equal 100%. See "Prepayment and Yield Considerations" herein and
in the Prospectus. Notwithstanding the foregoing, no reduction of the Class A
Prepayment Percentage will occur on any Distribution Date if (i) as of such
Distribution Date as to which any such reduction applies, the average
outstanding principal balance on such Distribution Date and for the preceding
five Distribution Dates on the Mortgage Loans that were delinquent 60 days or
more (including for this purpose any Mortgage Loans in foreclosure and Mortgage
Loans with respect to which the related Mortgaged Property has been acquired by
the Trust Estate) is greater than or equal to 50% of the sum of the then-
outstanding Class M Principal Balance and the then-outstanding Class B Principal
Balance, or (ii) for any Distribution Date, cumulative Realized Losses with
respect to the Mortgage Loans exceed the percentages of the principal balance of
the Subordinated Certificates as of the Cut-Off Date (the "Original Subordinated
Principal Balance") indicated below:
 
<TABLE>
<CAPTION>
                                                        PERCENTAGE OF ORIGINAL SUBORDINATED
DISTRIBUTION DATE OCCURRING IN                                   PRINCIPAL BALANCE
- ------------------------------------------------------  -----------------------------------
<S>                                                     <C>
November 2001 through October 2002....................                     30%
November 2002 through October 2003....................                     35%
November 2003 through October 2004....................                     40%
November 2004 through October 2005....................                     45%
November 2005 and thereafter..........................                     50%
</TABLE>
 
    This disproportionate allocation of certain unscheduled payments in respect
of principal will have the effect of accelerating the amortization of the Class
A Certificates (other than the Class A-PO Certificates) while, in the absence of
Realized Losses, increasing the interest in the principal balance of the
Mortgage Loans evidenced by the Class M and Class B Certificates. Increasing the
respective interest of the Class M and Class B Certificates relative to that of
the Class A Certificates (other than the Class A-PO Certificates) is intended to
preserve the availability of the subordination provided by the Class M and Class
B Certificates. See "-- Subordination of Class M and Class B Certificates"
below. The "Subordinated Percentage" for any Distribution Date will be
calculated as the difference between 100% and the Class A Percentage for such
date. The "Subordinated Prepayment Percentage" for any Distribution Date will be
calculated as the difference between 100% and the Class A Prepayment Percentage
for such date. If on any Distribution Date the allocation to the Class A
Certificates (other than the Class A-PO Certificates) of full and partial
principal prepayments and other amounts in the percentage required above would
reduce the outstanding Class A Non-PO Principal Balance below zero, the Class A
Prepayment Percentage for such Distribution Date will be limited to the
percentage necessary to reduce the Class A Non-PO Principal Balance to zero.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS A-PO CERTIFICATES
 
    Distributions in reduction of the Class A Subclass Principal Balance of the
Class A-PO Certificates will be made on each Distribution Date in an aggregate
amount equal to the Class A-PO Distribution Amount. The "Class A-PO Distribution
Amount" with respect to any Distribution Date will be equal to the sum of (i)
the amount distributed pursuant to priority THIRD clause (B) of the Pool
Distribution Amount Allocation, in an aggregate amount up to the Class A-PO
Optimal Principal Amount and (ii) the amount distributed pursuant to priority
FOURTH of the Pool Distribution Amount Allocation, in an aggregate amount up to
the Class A-PO Deferred Amount.
 
    The "Class A-PO Optimal Principal Amount" with respect to each Distribution
Date will be an amount equal to the sum for each outstanding Mortgage Loan
(including each defaulted Mortgage Loan, other than a Liquidated Loan, with
respect to which the related Mortgaged Property has been acquired by the Trust
Estate) of the product of (A) the PO Fraction for such Mortgage Loan and (B) the
sum of:
 
    (i) the scheduled payment of principal due on such Mortgage Loan on the
       first day of the month in which the Distribution Date occurs, less, if
       the Bankruptcy Loss Amount is zero, the principal portion of Debt Service
       Reductions with respect to such Mortgage Loan,
 
                                      S-42
<PAGE>
    (ii) all Unscheduled Principal Receipts that were received by a Servicer
       with respect to such Mortgage Loan during the Unscheduled Principal
       Receipt Period relating to such Distribution Date for each applicable
       type of Unscheduled Principal Receipt,
 
    (iii) the Scheduled Principal Balance of such Mortgage Loan which, during
       the month preceding the month of such Distribution Date was repurchased
       by the Seller, as described under the heading "Description of the
       Mortgage Loans -- Mandatory Repurchase or Substitution of Mortgage Loans"
       herein, and
 
    (iv) the excess of the unpaid principal balance of any defective Mortgage
       Loan for which a Mortgage Loan was substituted during the month preceding
       the month in which such Distribution Date occurs over the unpaid
       principal balance of such substituted Mortgage Loan, less the amount
       allocable to the principal portion of any unreimbursed advances in
       respect of such defective Mortgage Loan. See "The Pooling and Servicing
       Agreement -- Assignment of Mortgage Loans to the Trustee" in the
       Prospectus.
 
    The "Class A-PO Deferred Amount" for any Distribution Date prior to the
Cross-Over Date will equal the difference between (A) the sum of (i) the amount
by which the Class A-PO Optimal Principal Amount for all prior Distribution
Dates exceeds the amounts distributed to the Class A-PO Certificates on such
prior Distribution Dates pursuant to priority THIRD, clause (B) of the Pool
Distribution Amount Allocation, but only to the extent such shortfall is not
attributable to Realized Losses allocated to the Class A-PO Certificates as
described in "-- Subordination of Class M and Class B Certificates -- Allocation
of Losses" below and (ii) the sum of the product for each Discount Mortgage Loan
which became a Liquidated Loan at any time on or prior to the last day of the
Unscheduled Principal Receipt Period for the current Distribution Date of (a)
the PO Fraction for such Discount Mortgage Loan and (b) an amount equal to the
principal portion of Realized Losses (other than Bankruptcy Losses due to Debt
Service Reductions) incurred with respect to such Discount Mortgage Loan other
than Excess Special Hazard Losses, Excess Fraud Losses and Excess Bankruptcy
Losses and (B) amounts distributed on the Class A-PO Certificates on prior
Distribution Dates pursuant to priority FOURTH of the Pool Distribution Amount
Allocation. On or after the Cross-Over Date, the Class A-PO Deferred Amount will
be zero. No interest will accrue on any Class A-PO Deferred Amount.
 
    In addition, in the event that there is any recovery of an amount in respect
of principal which had previously been allocated as a Realized Loss to the Class
A-PO Certificates, such Subclass, for so long as its principal balance has not
been reduced to zero, will be entitled to its share of such recovery in an
amount up to the amount by which the Class A Subclass Principal Balance of the
Class A-PO Certificates was reduced as a result of such Realized Loss.
 
    The "PO Fraction" with respect to any Discount Mortgage Loan will equal the
difference between 1.0 and the Non-PO Fraction for such Mortgage Loan. The PO
Fraction with respect to each Mortgage Loan that is not a Discount Mortgage Loan
will be zero.
 
    The "Pool Balance (PO Portion)" is the sum for each Discount Mortgage Loan
of the product of the Scheduled Principal Balance of such Discount Mortgage Loan
and the PO Fraction for such Discount Mortgage Loan.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS M AND CLASS B
    CERTIFICATES
 
    Distributions in reduction of the principal balance of the Class M
Certificates will be made on each Distribution Date, pursuant to priority
SEVENTH of the Pool Distribution Amount Allocation, in an aggregate amount (the
"Class M Principal Distribution Amount") up to the Class M Optimal Principal
Amount.
 
    The "Class M Optimal Principal Amount" with respect to each Distribution
Date will be an amount equal to the sum for each outstanding Mortgage Loan
(including each defaulted Mortgage
 
                                      S-43
<PAGE>
Loan, other than a Liquidated Loan, with respect to which the related Mortgaged
Property has been acquired by the Trust Estate) of the product of (A) the Non-PO
Fraction for such Mortgage Loan and (B) the sum of:
 
    (i)the Class M Percentage of (A) the scheduled payment of principal due on
       such Mortgage Loan on the first day of the month in which the
       Distribution Date occurs, less (B) if the Bankruptcy Loss Amount is zero,
       the principal portion of Debt Service Reductions with respect to such
       Mortgage Loan,
 
    (ii)
       the Class M Prepayment Percentage of all Unscheduled Principal Receipts
       that were received by a Servicer with respect to such Mortgage Loan
       during the Unscheduled Principal Receipt Period relating to such
       Distribution Date for each applicable type of Unscheduled Principal
       Receipt,
 
    (iii)
       the Class M Prepayment Percentage of the Scheduled Principal Balance of
       such Mortgage Loan which, during the month preceding the month of such
       Distribution Date was repurchased by the Seller, as described under the
       heading "Description of the Mortgage Loans -- Mandatory Repurchase or
       Substitution of Mortgage Loans" herein, and
 
    (iv)
       the Class M Percentage of the excess of the unpaid principal balance of
       any defective Mortgage Loan for which a Mortgage Loan was substituted
       during the month preceding the month in which such Distribution Date
       occurs over the unpaid principal balance of such substituted Mortgage
       Loan, less the amount allocable to the principal portion of any
       unreimbursed advances in respect of such defective Mortgage Loan. See
       "The Pooling and Servicing Agreement -- Assignment of the Mortgage Loans
       to the Trustee" in the Prospectus.
 
    Distributions in reduction of the principal balances of the Class B-1 and
Class B-2 Certificates will be made on each Distribution Date, pursuant to
priorities TENTH and THIRTEENTH, respectively, of the Pool Distribution Amount
Allocation, in an aggregate amount with respect to each such Subclass (the
"Class B-1 Principal Distribution Amount" and "Class B-2 Principal Distribution
Amount," respectively) up to the Subclass B Optimal Principal Amount for such
Subclass.
 
    The "Subclass B Optimal Principal Amount" for a particular Subclass of Class
B Certificates with respect to each Distribution Date will be an amount equal to
the sum for each outstanding Mortgage Loan (including each defaulted Mortgage
Loan, other than a Liquidated Loan, with respect to which the related Mortgaged
Property has been acquired by the Trust Estate) of the product of (A) the Non-PO
Fraction for such Mortgage Loan and (B) the sum of:
 
    (i)the Subclass B Percentage for such Subclass of (A) the scheduled payment
       of principal due on such Mortgage Loan on the first day of the month in
       which the Distribution Date occurs, less (B) if the Bankruptcy Loss
       Amount is zero, the principal portion of Debt Service Reductions with
       respect to such Mortgage Loan,
 
    (ii)
       the Subclass B Prepayment Percentage for such Subclass of all Unscheduled
       Principal Receipts that were received by a Servicer with respect to such
       Mortgage Loan during the Unscheduled Principal Receipt Period relating to
       such Distribution Date for each applicable type of Unscheduled Principal
       Receipt,
 
    (iii)
       the Subclass B Prepayment Percentage for such Subclass of the Scheduled
       Principal Balance of such Mortgage Loan which, during the month preceding
       the month of such Distribution Date was repurchased by the Seller, as
       described under the heading "Description of the Mortgage Loans --
       Mandatory Repurchase or Substitution of Mortgage Loans" herein, and
 
    (iv)
       the Subclass B Percentage for such Subclass of the excess of the unpaid
       principal balance of any defective Mortgage Loan for which a Mortgage
       Loan was substituted during the month preceding the month in which such
       Distribution Date occurs over the unpaid principal balance of such
       substituted Mortgage Loan, less the amount allocable to the principal
 
                                      S-44
<PAGE>
       portion of any unreimbursed advances in respect of such defective
       Mortgage Loan. See "The Pooling and Servicing Agreement -- Assignment of
       the Mortgage Loans to the Trustee" in the Prospectus.
 
    The principal distribution to the holders of Class M Certificates or a
Subclass of Class B Certificates will be reduced on any Distribution Date on
which (i) the principal balance of the Class M Certificates or such Subclass of
Class B Certificates on the following Determination Date would be reduced to
zero as a result of principal distributions or allocation of losses and (ii) the
principal balance of any Class A Certificates, and in the case of a Subclass of
Class B Certificates, the principal balances of the Class M Certificates or any
Subclass of Class B Certificates with a lower numerical designation, would be
subject to reduction on such Determination Date as a result of allocation of
Realized Losses (other than Excess Bankruptcy Losses, Excess Fraud Losses and
Excess Special Hazard Losses). The amount of any such reduction in the principal
distributed to the holders of Class M Certificates or such Subclass of Class B
Certificates will instead be distributed pro rata to the holders of any Subclass
(other than the Class A-PO Certificates) and Class senior in priority to receive
distributions in accordance with the Pool Distribution Amount Allocation.
 
    In addition, in the event that there is any recovery of an amount in respect
of principal which had previously been allocated as a Realized Loss to the Class
M Certificates or any Subclass of Class B Certificates, the Class M Certificates
or such Subclass, for so long as the principal balance of such Class or Subclass
has not been reduced to zero, will be entitled to their pro rata share of such
recovery up to the amount by which the Class M Principal Balance or Class B
Subclass Principal Balance was reduced as a result of such Realized Loss.
 
    The "Class M Percentage" and "Class M Prepayment Percentage" for any
Distribution Date will equal that portion of the Subordinated Percentage and
Subordinated Prepayment Percentage, as the case may be, represented by the
fraction the numerator of which is the then-outstanding Class M Principal
Balance and the denominator of which is the sum of the Class M Principal Balance
and, if any of the Subclasses of the Class B Certificates are entitled to
principal distributions for such Distribution Date as described below, the Class
B Subclass Principal Balances of the Subclasses entitled to principal
distributions.
 
    The "Subclass B Percentage" and "Subclass B Prepayment Percentage" for a
Subclass of Class B Certificates will equal the portion of the Subordinated
Percentage and Subordinated Prepayment Percentage, as the case may be,
represented by the fraction, the numerator of which is the then-outstanding
Class B Subclass Principal Balance for such Subclass of Class B Certificates and
the denominator of which is the sum of the Class M Principal Balance and the
Class B Subclass Principal Balances of the Subclasses entitled to principal
distributions for such Distribution Date as described below. In the event that a
Subclass of Class B Certificates is not entitled to principal distributions for
such Distribution Date, the Subclass B Percentage and Subclass B Prepayment
Percentage for such Subclass will both be 0% with respect to such Distribution
Date.
 
    In the event that on any Distribution Date, the Current Class M Fractional
Interest is less than the Original Class M Fractional Interest, then the Class
B-1, Class B-2, Class B-3, Class B-4 and Class B-5 Certificates will not be
entitled to distributions in respect of principal and the Class B Subclass
Principal Balances thereof will not be used to determine the Class M Percentage
and Class M Prepayment Percentage for such Distribution Date. For such
Distribution Date, the Class M Percentage and Class M Prepayment Percentage will
equal the Subordinated Percentage and the Subordinated Prepayment Percentage,
respectively. In the event that the Current Class M Fractional Interest equals
or exceeds the Original Class M Fractional Interest but the Current Class B-1
Fractional Interest is less than the Original Class B-1 Fractional Interest, the
Class B-2, Class B-3, Class B-4 and Class B-5 Certificates will not be entitled
to distributions in respect of principal and the Class B Subclass Principal
Balances of such Subclasses will not be used to determine the Class M
Percentage, the Class M Prepayment Percentage, the Subclass B Percentage for the
Class B-1 Certificates and the Subclass B Prepayment Percentage for the Class
B-1 Certificates for such Distribution Date. In the
 
                                      S-45
<PAGE>
event that each of the Current Class M Fractional Interest and the Current Class
B-1 Fractional Interest equals or exceeds the Original Class M Fractional
Interest and the Original Class B-1 Fractional Interest, respectively, but the
Current Class B-2 Fractional Interest is less than the Original Class B-2
Fractional Interest, the Class B-3, Class B-4 and Class B-5 Certificates will
not be entitled to distributions in respect of principal and the Class B
Subclass Principal Balances of such Subclasses will not be used to determine the
Class M Percentage, the Class M Prepayment Percentage, the Subclass B
Percentages for the Subclasses of Class B Certificates with lower numerical
designations and the Subclass B Prepayment Percentages for the Subclasses of
Class B Certificates with lower numerical designations for such Distribution
Date. In the event that each of the Current Class M Fractional Interest, the
Current Class B-1 Fractional Interest and the Current Class B-2 Fractional
Interest equals or exceeds the Original Class M Fractional Interest, the
Original Class B-1 Fractional Interest and the Original Class B-2 Fractional
Interest, respectively, but the Current Class B-3 Fractional Interest is less
than the Original Class B-3 Fractional Interest, the Class B-4 and Class B-5
Certificates will not be entitled to distributions in respect of principal and
the Class B Subclass Principal Balances of such Subclasses will not be used to
determine the Class M Percentage, the Class M Prepayment Percentage, the
Subclass B Percentages for the Subclasses of Class B Certificates with lower
numerical designations and the Subclass B Prepayment Percentages for the
Subclasses of Class B Certificates with lower numerical designations for such
Distribution Date. In the event that each of the Current Class M Fractional
Interest, the Current Class B-1 Fractional Interest, the Current Class B-2
Fractional Interest and the Current Class B-3 Fractional Interest equals or
exceeds the Original Class M Fractional Interest, the Original Class B-1
Fractional Interest, the Original Class B-2 Fractional Interest and the Original
Class B-3 Fractional Interest, respectively, but the Current Class B-4
Fractional Interest is less than the Original Class B-4 Fractional Interest, the
Class B-5 Certificates will not be entitled to distributions in respect of
principal and the Class B Subclass Principal Balance of such Subclass will not
be used to determine the Class M Percentage, the Class M Prepayment Percentage,
the Subclass B Percentages for the Subclasses of Class B Certificates with lower
numerical designations and the Subclass B Prepayment Percentages for the
Subclasses of Class B Certificates with lower numerical designations for such
Distribution Date. The Class B-5 Certificates will not have original or current
fractional interests which are required to be maintained as described above.
 
    The "Original Class M Fractional Interest" is the percentage obtained by
dividing the sum of the initial Class B Subclass Principal Balances of the Class
B-1, Class B-2, Class B-3, Class B-4 and Class B-5 Certificates by the sum of
the initial Class A Non-PO Principal Balance, initial Class M Principal Balance
and initial Class B Principal Balance. The Original Class M Fractional Interest
is expected to be approximately 2.29%. The "Current Class M Fractional Interest"
for any Distribution Date is the percentage obtained by dividing the sum of the
then-outstanding Class B Subclass Principal Balances of the Class B-1, Class
B-2, Class B-3, Class B-4 and Class B-5 Certificates by the sum of the
then-outstanding Class A Non-PO Principal Balance, the Class M Principal Balance
and the Class B Principal Balance.
 
    The "Original Class B-1 Fractional Interest" is the percentage obtained by
dividing the sum of the initial Class B Subclass Principal Balances of the Class
B-2, Class B-3, Class B-4 and Class B-5 Certificates by the sum of the initial
Class A Non-PO Principal Balance, initial Class M Principal Balance and initial
Class B Principal Balance. The Original Class B-1 Fractional Interest is
expected to be approximately 1.27%. The "Current Class B-1 Fractional Interest"
for any Distribution Date is the percentage obtained by dividing the sum of the
then-outstanding Class B Subclass Principal Balances of the Class B-2, Class
B-3, Class B-4 and Class B-5 Certificates by the sum of the then-outstanding
Class A Non-PO Principal Balance, the Class M Principal Balance and the Class B
Principal Balance.
 
    The "Original Class B-2 Fractional Interest" is the percentage obtained by
dividing the sum of the initial Class B Subclass Principal Balances of the Class
B-3, Class B-4 and Class B-5 Certificates by the sum of the initial Class A
Non-PO Principal Balance, initial Class M Principal Balance and initial
 
                                      S-46
<PAGE>
Class B Principal Balance. The Original Class B-2 Fractional Interest is
expected to be approximately 0.76%. The "Current Class B-2 Fractional Interest"
for any Distribution Date is the percentage obtained by dividing the sum of the
then-outstanding Class B Subclass Principal Balances of the Class B-3, Class B-4
and Class B-5 Certificates by the sum of the then-outstanding Class A Non-PO
Principal Balance, the Class M Principal Balance and the Class B Principal
Balance.
 
    The "Original Class B-3 Fractional Interest" is the percentage obtained by
dividing the sum of the initial Class B Subclass Principal Balances of the Class
B-4 and Class B-5 Certificates by the sum of the initial Class A Non-PO
Principal Balance, initial Class M Principal Balance and initial Class B
Principal Balance. The Original Class B-3 Fractional Interest is expected to be
approximately 0.46%. The "Current Class B-3 Fractional Interest" for any
Distribution Date is the percentage obtained by dividing the sum of the
then-outstanding Class B Subclass Principal Balances of the Class B-4 and Class
B-5 Certificates by the sum of the then-outstanding Class A Non-PO Principal
Balance, the Class M Principal Balance and the Class B Principal Balance.
 
    The "Original Class B-4 Fractional Interest" is the percentage obtained by
dividing the initial Class B Subclass Principal Balance of the Class B-5
Certificates by the sum of the initial Class A Non-PO Principal Balance, initial
Class M Principal Balance and initial Class B Principal Balance. The Original
Class B-4 Fractional Interest is expected to be approximately 0.30%. The
"Current Class B-4 Fractional Interest" for any Distribution Date is the
percentage obtained by dividing the then-outstanding Class B Subclass Principal
Balance of the Class B-5 Certificates by the sum of the then-outstanding Class A
Non-PO Principal Balance, the Class M Principal Balance and the Class B
Principal Balance.
 
    ALLOCATION OF AMOUNT TO BE DISTRIBUTED
 
    The Class A-7 Certificate is an interest-only certificate and is not
entitled to distributions in respect of principal.
 
    On each Distribution Date occurring prior to the Cross-Over Date, the Class
A Non-PO Principal Distribution Amount will be allocated among and distributed
in reduction of the Class A Subclass Principal Balances of the Subclasses of
Class A Certificates (other than the Class A Subclass Principal Balance of the
Class A-PO Certificates) as follows:
 
    FIRST, to the Class A-4 Certificates, up to the Class A-4 Priority Amount;
 
    SECOND, concurrently, to the Class A-R and Class A-LR Certificates, pro
rata, until the Class A Subclass Principal Balance of each such Subclass has
been reduced to zero;
 
    THIRD, concurrently, approximately 23.05876063% to the Class A-1
Certificates, approximately 47.87999744% to the Class A-2 Certificates and
approximately 29.06124193% to the Class A-6 Certificates, until the Class A
Subclass Principal Balance of the Class A-1 Certificates has been reduced to
zero;
 
    FOURTH, concurrently, approximately 64.51093671% to the Class A-2
Certificates and approximately 35.48906329% sequentially to the Class A-6
Certificates and the Class A-5 Certificates, in that order, until the Class A
Subclass Principal Balance of each such Subclass has been reduced to zero;
 
    FIFTH, to the Class A-3 Certificates, until the Class A Subclass Principal
Balance thereof has been reduced to zero; and
 
    SIXTH, to the Class A-4 Certificates, without regard to the Class A-4
Priority Amount, until the Class A Subclass Principal Balance thereof has been
reduced to zero.
 
    The "Class A-4 Priority Amount" for any Distribution Date means the lesser
of (i) the Class A Subclass Principal Balance of the Class A-4 Certificates and
(ii) the sum of (A) the product of (1) the Class A-4 Percentage and (2) the
Scheduled Principal Amount and (B) the product of (1) the Class A-4 Percentage,
(2) the Class A-4 Prepayment Shift Percentage, and (3) the Unscheduled Principal
Amount.
 
    The "Class A-4 Percentage" means the Class A Subclass Principal Balance of
the Class A-4 Certificates divided by the Pool Balance (Non-PO Portion).
 
                                      S-47
<PAGE>
    The "Scheduled Principal Amount" means the sum for each outstanding Mortgage
Loan (including each defaulted Mortgage Loan, other than a Liquidated Loan, with
respect to which the related Mortgaged Property has been acquired by the Trust
Estate) of the product of (A) the Non-PO Fraction for such Mortgage Loan and (B)
the sum of the amounts described in clauses B(i) and B(iv) of the definition of
"Class A Non-PO Optimal Principal Amount" on page S-40, but without that amount
being multiplied by the Class A Percentage.
 
    The "Unscheduled Principal Amount" means the sum for each outstanding
Mortgage Loan (including each defaulted Mortgage Loan, other than a Liquidated
Loan, with respect to which the related Mortgage Property has been acquired by
the Trust Estate) of the product of (A) the Non-PO Fraction for such Mortgage
Loan and (B) the sum of the amounts described in clauses B(ii) and B(iii) of the
definition of "Class A Non-PO Optimal Principal Amount" on page S-40, but
without that amount being multiplied by the Class A Prepayment Percentage.
 
    The "Class A-4 Prepayment Shift Percentage" for any Distribution Date will
be the percentage indicated below:
 
<TABLE>
<CAPTION>
DISTRIBUTION DATE OCCURRING IN                                                  CLASS A-4 PREPAYMENT SHIFT PERCENTAGE
- -----------------------------------------------------------------------------  ---------------------------------------
<S>                                                                            <C>
November 1996 through October 2001...........................................                         0%
November 2001 through October 2002...........................................                        30%
November 2002 through October 2003...........................................                        40%
November 2003 through October 2004...........................................                        60%
November 2004 through October 2005...........................................                        80%
November 2005 and thereafter.................................................                       100%
</TABLE>
 
    Notwithstanding the foregoing, on each Distribution Date occurring on or
after the Cross-Over Date, the Class A Non-PO Principal Distribution Amount will
be distributed among the Subclasses of Class A Certificates (other than the
Class A-PO Certificates) pro rata in accordance with their respective
outstanding Class A Subclass Principal Balances without regard to either the
proportions or the priorities set forth above.
 
    Any amounts distributed on a Distribution Date to the holders of Class A
Certificates of any Subclass in reduction of principal balance will be allocated
among the holders of Class A Certificates of such Subclass pro rata in
accordance with their respective Percentage Interests.
 
    Any amounts distributed on any Distribution Date to the holders of the Class
M and Offered Class B Certificates in reduction of principal balance will be
allocated among the holders of each such Class or Subclass pro rata in
accordance with their respective Percentage Interests.
 
ADDITIONAL RIGHTS OF THE CLASS A-R AND CLASS A-LR CERTIFICATEHOLDERS
 
    The Class A-R and Class A-LR Certificates will remain outstanding for as
long as the Trust Estate shall exist, whether or not either such Subclass is
receiving current distributions of principal or interest. The holders of the
Class A-R and Class A-LR Certificates will be entitled to receive the proceeds
of the remaining assets of the Trust Estate, if any, on the final Distribution
Date for the Series 1996-7 Certificates, after distributions in respect of any
accrued but unpaid interest on the Series 1996-7 Certificates and after
distributions in reduction of principal balance have reduced the principal
balances of the Series 1996-7 Certificates to zero. It is not anticipated that
there will be any assets remaining in the Trust Estate on the final Distribution
Date following the distributions of interest and in reduction of principal
balance made on the Series 1996-7 Certificates on such date.
 
    In addition, the Class A-LR Certificateholder will be entitled on each
Distribution Date to receive any Pool Distribution Amount remaining after all
distributions pursuant to the Pool Distribution Amount Allocation have been made
and any Net Foreclosure Profits. "Net Foreclosure Profits" means, with respect
to any Distribution Date, the excess, if any, of (i) the aggregate profits on
Liquidated Loans in the related period with respect to which net Liquidation
Proceeds exceed the unpaid principal balance thereof plus accrued interest
thereon at the Mortgage Interest Rate over
 
                                      S-48
<PAGE>
(ii) the aggregate Realized Losses on Liquidated Loans in the related period
with respect to which net Liquidation Proceeds are less than the unpaid
principal balance thereof plus accrued interest thereon at the Mortgage Interest
Rate. It is not anticipated that there will be any such Net Foreclosure Profits
or undistributed portion of the Pool Distribution Amounts.
 
PERIODIC ADVANCES
 
    If, on any Determination Date, payments of principal and interest due on any
Mortgage Loan in the Trust Estate on the related Due Date have not been
received, the Servicer of the Mortgage Loan will, in certain circumstances, be
required to advance on or before the related Distribution Date for the benefit
of holders of the Series 1996-7 Certificates an amount in cash equal to all
delinquent payments of principal and interest due on each Mortgage Loan in the
Trust Estate (with interest adjusted to the applicable Net Mortgage Interest
Rate) not previously advanced, but only to the extent that such Servicer
believes that such amounts will be recoverable by it from liquidation proceeds
or other recoveries in respect of the related Mortgage Loan (each, a "Periodic
Advance"). Upon a Servicer's failure to make a required Periodic Advance, the
Trust Administrator, if such Servicer is Norwest Mortgage, or the Master
Servicer, if such Servicer is not Norwest Mortgage, will be required to make
such Periodic Advance.
 
    The Underlying Servicing Agreements and the Pooling and Servicing Agreement
provide that any advance of the kind described in the preceding paragraph may be
reimbursed to the related Servicer or the Master Servicer or the Trust
Administrator, as applicable, at any time from funds available in the Servicer
Custodial Account or the Certificate Account, as the case may be, to the extent
that (i) such funds represent receipts on, or liquidation, insurance, purchase
or repurchase proceeds in respect of, the Mortgage Loans to which the advance
relates or (ii) the Servicer, the Master Servicer or Trust Administrator, as
applicable, has determined in good faith that the advancing party will be unable
to recover such advance from funds of the type referred to in clause (i) above.
 
RESTRICTIONS ON TRANSFER OF THE CLASS A-R, CLASS A-LR, CLASS M AND OFFERED CLASS
B CERTIFICATES
 
    The Class A-R and Class A-LR Certificates will be subject to the following
restrictions on transfer, and each of the Class A-R and Class A-LR Certificate
will contain a legend describing such restrictions.
 
    The REMIC provisions of the Code impose certain taxes on (i) transferors of
residual interests to, or agents that acquire residual interests on behalf of,
Disqualified Organizations and (ii) certain Pass-Through Entities (as defined in
the Prospectus) that have Disqualified Organizations as beneficial owners. No
tax will be imposed on a Pass-Through Entity with respect to the Class A-R or
Class A-LR Certificate to the extent it has received an affidavit from the owner
thereof that such owner is not a Disqualified Organization or a nominee for a
Disqualified Organization. The Pooling and Servicing Agreement will provide that
no legal or beneficial interest in the Class A-R or Class A-LR Certificate may
be transferred to or registered in the name of any person unless (i) the
proposed purchaser provides to the Trust Administrator an affidavit (or, to the
extent acceptable to the Trust Administrator, a representation letter signed
under penalty of perjury) to the effect that, among other items, such transferee
is not a Disqualified Organization (as defined in the Prospectus) and is not
purchasing the Class A-R or Class A-LR Certificate as an agent for a
Disqualified Organization (i.e., as a broker, nominee, or other middleman
thereof) and (ii) the transferor states in writing to the Trust Administrator
that it has no actual knowledge that such affidavit or letter is false. Further,
such affidavit or letter requires the transferee to affirm that it (i)
historically has paid its debts as they have come due and intends to do so in
the future, (ii) understands that it may incur tax liabilities with respect to
the Class A-R or Class A-LR Certificate in excess of cash flows generated
thereby, (iii) intends to pay taxes associated with holding the Class A-R or
Class A-LR Certificate as such taxes become due and (iv) will not transfer the
Class A-R or Class A-LR Certificate to any person or entity that does not
provide a similar affidavit or letter. The transferor must certify in writing to
the Trust Administrator that, as of the date of the transfer, it had no
knowledge or reason to know that the affirmations made by the transferee
pursuant to the preceding sentence were false.
 
                                      S-49
<PAGE>
    In addition, the Class A-R and Class A-LR Certificates may not be purchased
by or transferred to any person that is not a "U.S. Person," unless (i) such
person holds such Class A-R or Class A-LR Certificate in connection with the
conduct of a trade or business within the United States and furnishes the
transferor and the Trust Administrator with an effective Internal Revenue
Service Form 4224 or (ii) the transferee delivers to both the transferor and the
Trust Administrator an opinion of a nationally recognized tax counsel to the
effect that such transfer is in accordance with the requirements of the Code and
the regulations promulgated thereunder and that such transfer of the Class A-R
or Class A-LR Certificate will not be disregarded for federal income tax
purposes. The term "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, an
estate that is subject to United States federal income tax regardless of the
source of its income, or a trust if (A) for taxable years beginning after
December 31, 1996 (or after August 20, 1996, if the trustee has made an
applicable election), a court within the United States is able to exercise
primary supervision over the administration of such trust, and one or more
United States fiduciaries have the authority to control all substantial
decisions of such trust or (B) for all other taxable years, such trust is
subject to United States federal income tax regardless of the source of its
income.
 
    The Pooling and Servicing Agreement will provide that any attempted or
purported transfer in violation of these transfer restrictions will be null and
void and will vest no rights in any purported transferee. Any transferor or
agent to whom the Trust Administrator provides information as to any applicable
tax imposed on such transferor or agent may be required to bear the cost of
computing or providing such information. See "Certain Federal Income Tax
Consequences -- Federal Income Tax Consequences for REMIC Certificates --
Taxation of Residual Certificates--Tax-Related Restrictions on Transfer of
Residual Certificates" in the Prospectus.
 
    NEITHER THE CLASS A-R NOR CLASS A-LR CERTIFICATE MAY BE PURCHASED BY OR
TRANSFERRED TO A PLAN. See "ERISA Considerations" herein and in the Prospectus.
 
    Because the Class M and Offered Class B Certificates are subordinated to the
Class A Certificates, Class M and Offered Class B Certificates may not be
transferred unless the transferee has delivered (i) a representation letter to
the Trustee and the Seller stating either (a) that the transferee is not a Plan
and is not acting on behalf of a Plan or using the assets of a Plan to effect
such purchase or (b) subject to the conditions described herein, that the source
of funds used to purchase the Class M or Offered Class B Certificates is an
"insurance company general account" or (ii) an opinion of counsel as described
herein under "ERISA Considerations." See "ERISA Considerations" herein and in
the Prospectus.
 
REPORTS
 
    In addition to the applicable information specified in the Prospectus, the
Master Servicer will include in the statement delivered to holders of Class A,
Class M and Class B Certificates with respect to each Distribution Date the
following information: (i) the amount of such distribution allocable to
interest, the amount of interest currently distributable to each Subclass of
Class A and Class B Certificates and to the Class M Certificates, any Class A
Subclass Interest Shortfall Amount or Class B Subclass Interest Shortfall Amount
arising with respect to each Subclass or any Class M Interest Shortfall Amount
on such Distribution Date, any remaining unpaid Class A Subclass Interest
Shortfall Amount or Class B Subclass Interest Shortfall Amount with respect to
each Subclass, or any remaining unpaid Class M Interest Shortfall Amount, after
giving effect to such distribution and any Non-Supported Interest Shortfall or
the interest portion of Realized Losses allocable to such Subclass or Class with
respect to such Distribution Date, (ii) the amount of such distribution
allocable to principal, (iii) the Class A Non-PO Principal Balance, the Class M
Principal Balance, the Class B Principal Balance, the Class A Subclass Principal
Balance of each Subclass of Class A Certificates and the Class B Subclass
Principal Balance of each Subclass of Class B Certificates in each case after
giving effect to the distribution of principal and the allocation of the
principal portion of Realized Losses to such Subclass or Class with respect to
such Distribution Date, (iv) the Adjusted Pool Amount, the
 
                                      S-50
<PAGE>
Adjusted Pool Amount (Class A-PO Portion) and the Pool Scheduled Principal
Balance of the Mortgage Loans and the aggregate Scheduled Principal Balance of
the Discount Mortgage Loans for such Distribution Date, (v) the Class A
Percentage, Class M Percentage and Subclass B Percentage of each Subclass of
Class B Certificates for the following Distribution Date (without giving effect
to Unscheduled Principal Receipts received after the applicable Unscheduled
Principal Receipt Period for the current Distribution Date that are applied
during such Unscheduled Principal Receipt Period), and (vi) the amount of the
remaining Special Hazard Loss Amount, the Fraud Loss Amount and the Bankruptcy
Loss Amount as of the close of business on such Distribution Date. The statement
delivered to the holder of the Class A-7 Certificate will also include the Class
A-7 Notional Amount. See "Servicing of the Mortgage Loans -- Reports to
Certificateholders" in the Prospectus.
 
    Copies of the foregoing reports are available upon written request to the
Trust Administrator at its corporate trust office. See "Pooling and Servicing
Agreement -- Trust Administrator" herein.
 
SUBORDINATION OF CLASS M AND CLASS B CERTIFICATES
 
    The rights of the holders of the Class M Certificates to receive
distributions with respect to the Mortgage Loans in the Trust Estate will be
subordinated to such rights of the holders of the Class A Certificates, the
rights of the holders of the Class B Certificates to receive distributions with
respect to the Mortgage Loans in the Trust Estate will be subordinated to such
rights of the holders of the Class A Certificates and the Class M Certificates
and the rights of the holders of the Subclasses of Class B Certificates with
higher numerical designations to receive distributions with respect to the
Mortgage Loans in the Trust Estate will be subordinated to such rights of the
holders of Subclasses of Class B Certificates with lower numerical designations,
all to the extent described below. This subordination is intended to enhance the
likelihood of timely receipt by the holders of the Class A Certificates (to the
extent of the subordination of the Class M and Class B Certificates), the
holders of the Class M Certificates (to the extent of the subordination of the
Class B Certificates) and the holders of a Subclass of Class B Certificates (to
the extent of the subordination of Subclasses of Class B Certificates with
higher numerical designations) of the full amount of their scheduled monthly
payments of interest and principal and to afford the holders of the Class A
Certificates (to the extent of the subordination of the Class M and Class B
Certificates), the holders of the Class M Certificates (to the extent of the
subordination of the Class B Certificates) and the holders of the Subclasses of
Class B Certificates (to the extent of the subordination of Subclasses of Class
B Certificates with higher numerical designations) protection against Realized
Losses, as more fully described below. If Realized Losses exceed the credit
support provided through subordination to the Class A Certificates, the Class M
Certificates or a Subclass of Class B Certificates or if Excess Special Hazard
Losses, Excess Fraud Losses or Excess Bankruptcy Losses occur, all or a portion
of such losses will be borne by the Class A Certificates, the Class M
Certificates or such Subclass of Class B Certificates.
 
    The protection afforded to the holders of Class A Certificates by means of
the subordination feature will be accomplished by the preferential right of such
holders to receive, prior to any distribution being made on a Distribution Date
in respect of the Class M and Class B Certificates, the amounts of principal and
interest due the Class A Certificateholders on each Distribution Date out of the
Pool Distribution Amount with respect to such date and, if necessary, by the
right of such holders to receive future distributions on the Mortgage Loans that
would otherwise have been payable to the holders of Class M and Class B
Certificates. The application of this subordination to cover Realized Losses
experienced in periods prior to the periods in which a Subclass of Class A
Certificates is entitled to distributions in reduction of principal balance will
decrease the protection provided by the subordination to any such Subclass.
 
    The protection afforded to the holders of Class M Certificates by means of
the subordination feature will be accomplished by the preferential right of such
holders to receive, prior to any distribution being made on a Distribution Date
in respect of the Class B Certificates, the amounts of principal (other than any
amount used to pay the Class A-PO Deferred Amount) and interest due the Class M
Certificateholders on each Distribution Date from the Pool Distribution Amount
with respect to such
 
                                      S-51
<PAGE>
date (after all required payments on the Class A Certificates have been made)
and, if necessary, by the right of such holders to receive future distributions
on the Mortgage Loans that would otherwise have been payable to the holders of
the Class B Certificates.
 
    A Subclass of Class B Certificates will be entitled, on each Distribution
Date, to the remaining portion, if any, of the applicable Pool Distribution
Amount, after payment of the Class A Optimal Amount, the Class A-PO Deferred
Amount, the Class M Optimal Amount and the Subclass B Optimal Amount of each
Subclass of Class B Certificates with a lower numerical designation for such
date. Amounts so distributed to Class B Certificateholders will not be available
to cover delinquencies or Realized Losses in respect of subsequent Distribution
Dates.
 
ALLOCATION OF LOSSES
 
    Realized Losses (other than Excess Special Hazard Losses, Excess Fraud
Losses or Excess Bankruptcy Losses) will not be allocated to the holders of the
Class A Certificates until the date on which the amount of principal payments on
the Mortgage Loans to which the holders of the Subordinated Certificates are
entitled has been reduced to zero as a result of the allocation of losses to the
Subordinated Certificates, i.e., the Distribution Date preceding the
Distribution Date for which the Subordinated Percentage is equal to zero (the
"Cross-Over Date"). Prior to such time, such Realized Losses will be allocated
first to the Subclasses of Class B Certificates sequentially in reverse
numerical order, until the Class B Subclass Principal Balance of each such
Subclass has been reduced to zero, and then to the Class M Certificates until
the Class M Principal Balance has been reduced to zero.
 
    The allocation of the principal portion of a Realized Loss (other than a
Debt Service Reduction, Excess Special Hazard Loss, Excess Fraud Loss or Excess
Bankruptcy Loss) will be effected through the adjustment of the principal
balance of the most subordinate Class (or in the case of the Subclasses of Class
B Certificates, the most subordinate Subclass) then outstanding in such amount
as is necessary to cause the sum of the Class A Subclass Principal Balances, the
Class M Principal Balance and the Class B Subclass Principal Balances to equal
the Adjusted Pool Amount.
 
    Allocations to the Class M Certificates or the Subclasses of Class B
Certificates of (i) the principal portion of Debt Service Reductions, (ii) the
interest portion of Realized Losses (other than Excess Special Hazard Losses,
Excess Fraud Losses and Excess Bankruptcy Losses), (iii) any interest shortfalls
resulting from delinquencies for which the Servicer, the Master Servicer or the
Trust Administrator does not advance, (iv) any interest shortfalls or losses
resulting from the application of the Soldiers' and Sailors' Civil Relief Act of
1940, as more fully described under "Certain Legal Aspects of the Mortgage Loans
- -- Soldiers' and Sailors' Civil Relief Act" in the Prospectus and (v) any
interest shortfalls resulting from the timing of the receipt of Unscheduled
Principal Receipts (other than Prepayments in Full) with respect to Mortgage
Loans will result from the priority of distributions of the Pool Distribution
Amount first to the holders of the Class A Certificates, second to the Class M
Certificates and finally to the Subclasses of Class B Certificates in numerical
order as described above under "-- Distributions."
 
    The allocation of the principal portion of Realized Losses (other than
Excess Special Hazard Losses, Excess Fraud Losses and Excess Bankruptcy Losses)
in respect of the Mortgage Loans allocated on or after the Cross-Over Date will
be effected through the adjustment on any Determination Date of the Class A
Non-PO Principal Balance and the Class A Subclass Principal Balance of the Class
A-PO Certificates such that (i) the Class A Non-PO Principal Balance equals the
Adjusted Pool Amount less the Adjusted Pool Amount (PO Portion) as of the
preceding Distribution Date and (ii) the Class A Subclass Principal Balance of
the Class A-PO Certificates equals the Adjusted Pool Amount (PO Portion) as of
the preceding Distribution Date. The principal portion of such Realized Losses
allocated to the Class A Certificates (other than the Class A-PO Certificates)
will be allocated to such outstanding Subclasses of Class A Certificates pro
rata in accordance with their Class A Subclass Principal Balances. The interest
portion of any Realized Loss allocated on or after the Cross-Over Date will be
allocated among the outstanding Subclasses of Class A Certificates (other than
the Class A-PO Certificates) pro rata in accordance with their respective Class
A Subclass Interest
 
                                      S-52
<PAGE>
Accrual Amounts, without regard to any reduction pursuant to this sentence. Any
such losses will be allocated among the outstanding Class A Certificates within
each Subclass pro rata in accordance with their respective Percentage Interests.
 
    Any Excess Special Hazard Losses, Excess Fraud Losses or Excess Bankruptcy
Losses will be allocated (i) with respect to the principal portion of such
losses (a) to the outstanding Subclasses of the Class A Certificates (other than
the Class A-PO Certificates), Class M Certificates and Class B Certificates pro
rata based on their outstanding principal balances in proportion to the Non-PO
Fraction of such losses and (b) in respect of Discount Mortgage Loans, to the
Class A-PO Certificates in proportion to the PO Fraction of such losses and (ii)
with respect to the interest portion of such losses, to the Class A, Class M and
Class B Certificates pro rata based on the interest accrued. The principal
portion of any such losses so allocated to the Class A Certificates (other than
the Class A-PO Certificates) will be allocated among the outstanding Subclasses
of Class A Certificates pro rata in accordance with their then-outstanding Class
A Subclass Principal Balances and the interest portion of any such losses will
be allocated among the outstanding Subclasses of Class A Certificates (other
than the Class A-PO Certificates) in accordance with their Class A Subclass
Interest Accrual Amounts, without regard to any reduction pursuant to this
sentence. Any losses allocated to a Subclass of Class A Certificates will be
allocated among the outstanding Class A Certificates within such Subclass pro
rata in accordance with their respective Percentage Interests.
 
    The interest portion of Excess Special Hazard Losses, Excess Fraud Losses
and Excess Bankruptcy Losses will be allocated by reducing the Class A Subclass
Interest Accrual Amounts, Class M Interest Accrual Amount and Class B Subclass
Interest Accrual Amounts.
 
    As described above, the Pool Distribution Amount for any Distribution Date
will include current receipts (other than certain unscheduled payments in
respect of principal) from the Mortgage Loans otherwise payable to holders of
the Class M and Class B Certificates. If the Pool Distribution Amount is not
sufficient to cover the amount of principal payable to the holders of the Class
A Certificates on a particular Distribution Date, then the percentage of
principal payments on the Mortgage Loans to which the holders of the Class A
Certificates (other than the Class A-PO Certificates) will be entitled (I.E.,
the Class A Percentage) on and after the next Distribution Date will be
proportionately increased, thereby reducing, as a relative matter, the
respective interest of the Class M and Class B Certificates in future payments
of principal on the Mortgage Loans in the Trust Estate. Such a shortfall could
occur, for example, if a considerable number of Mortgage Loans were to become
Liquidated Loans in a particular month.
 
    Special Hazard Losses, other than Excess Special Hazard Losses, will be
allocated solely to the Subclasses of Class B Certificates in reverse numerical
order or, following the reduction of the Class B Principal Balance to zero,
solely to the Class M Certificates. Special Hazard Losses in excess of the
Special Hazard Loss Amount are "Excess Special Hazard Losses." Excess Special
Hazard Losses will be allocated among (i) the Class A Certificates (other than
the Class A-PO Certificates), the Class M Certificates and the Class B
Certificates and (ii) to the extent such Excess Special Hazard Losses arise with
respect to Discount Mortgage Loans, the Class A-PO Certificates. If the
aggregate of all Special Hazard Losses incurred in the month preceding the month
of the related Distribution Date (the "Aggregate Current Special Hazard Losses")
is less than or equal to the then-applicable Special Hazard Loss Amount, no
Special Hazard Losses will be regarded as Excess Special Hazard Losses. If
Aggregate Current Special Hazard Losses exceed the then-applicable Special
Hazard Loss Amount, a portion of each Special Hazard Loss will be regarded as an
"Excess Special Hazard Loss" in proportion to the ratio of (a) the excess of (i)
Aggregate Current Special Hazard Losses over (ii) the then-applicable Special
Hazard Loss Amount, to (b) the Aggregate Current Special Hazard Losses.
Thereafter, when the Special Hazard Loss Amount is zero, all Special Hazard
Losses will be regarded as Excess Special Hazard Losses. Upon initial issuance
of the Series 1996-7 Certificates, the "Special Hazard Loss Amount" with respect
thereto will be equal to approximately 1.61% (approximately $2,419,943) of the
Cut-Off Date Aggregate Principal Balance of the Mortgage Loans. As of any
Distribution Date, the Special Hazard Loss Amount will equal the initial Special
Hazard Loss Amount less the sum of
 
                                      S-53
<PAGE>
(A) any Special Hazard Losses allocated solely to the Class B or Class M
Certificates and (B) the Adjustment Amount. The "Adjustment Amount" on each
anniversary of the Cut-Off Date will be equal to the amount, if any, by which
the Special Hazard Amount, without giving effect to the deduction of the
Adjustment Amount for such anniversary, exceeds the greater of (i) 1.00% (or, if
greater than 1.00%, the highest percentage of Mortgage Loans by principal
balance in any California zip code) times the aggregate principal balance of all
the Mortgage Loans on such anniversary (ii) twice the principal balance of the
single Mortgage Loan having the largest principal balance, and (iii) that which
is necessary to maintain the original ratings assigned to the Class A and Class
M Certificates by Fitch and S&P and the original ratings assigned to the Offered
Class B Certificates by Fitch, as evidenced by letters to that effect delivered
by Fitch and S&P to the Master Servicer and the Trust Administrator. On and
after the Cross-Over Date, the Special Hazard Loss Amount will be zero.
 
    Fraud Losses, other than Excess Fraud Losses, will be allocated solely to
the Subclasses of Class B Certificates in reverse numerical order or, following
the reduction of the Class B Principal Balance to zero, solely to the Class M
Certificates. Fraud Losses in excess of the Fraud Loss Amount are "Excess Fraud
Losses." Excess Fraud Losses will be allocated among (i) the Class A
Certificates (other than the Class A-PO Certificates), the Class M Certificates
and the Class B Certificates and (ii) to the extent such Excess Fraud Losses
arise with respect to Discount Mortgage Loans, the Class A-PO Certificates. If
the aggregate of all Fraud Losses incurred in the month preceding the month of
the related Distribution Date (the "Aggregate Current Fraud Losses") is less
than or equal to the then-applicable Fraud Loss Amount, no Fraud Losses will be
regarded as Excess Fraud Losses. If Aggregate Current Fraud Losses exceed the
then-applicable Fraud Loss Amount, a portion of each Fraud Loss will be regarded
as an "Excess Fraud Loss" in proportion to the ratio of (a) the excess of (i)
Aggregate Current Fraud Losses over (ii) the then-applicable Fraud Loss Amount,
to (b) the Aggregate Current Fraud Losses. Thereafter, when the Fraud Loss
Amount is zero, all Fraud Losses will be regarded as Excess Fraud Losses. Upon
initial issuance of the Series 1996-7 Certificates, the "Fraud Loss Amount" with
respect thereto will be equal to approximately 2.00% (approximately $3,006,179)
of the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans. As of any
Distribution Date prior to the first anniversary of the Cut-Off Date, the Fraud
Loss Amount will equal the initial Fraud Loss Amount minus the aggregate amount
of Fraud Losses allocated solely to the Class B or Class M Certificates through
the related Determination Date. As of any Distribution Date from the first
through fifth anniversary of the Cut-Off Date, the Fraud Loss Amount will be an
amount equal to (1) the lesser of (a) the Fraud Loss Amount as of the most
recent anniversary of the Cut-Off Date and (b) 1.00% of the aggregate principal
balance of all of the Mortgage Loans as of the most recent anniversary of the
Cut-Off Date minus (2) the aggregate amounts allocated solely to the Class B or
Class M Certificates with respect to Fraud Losses since the most recent
anniversary of the Cut-Off Date through the related Determination Date. On and
after the Cross-Over Date or after the fifth anniversary of the Cut-Off Date,
the Fraud Loss Amount will be zero.
 
    Bankruptcy Losses, other than Excess Bankruptcy Losses, will be allocated
solely to the Subclasses of Class B Certificates in reverse numerical order or,
following the reduction of the Class B Principal Balance to zero, solely to the
Class M Certificates. Bankruptcy losses in excess of the Bankruptcy Loss Amount
are "Excess Bankruptcy Losses." Excess Bankruptcy Losses will be allocated among
(i) the Class A Certificates (other than the Class A-PO Certificates), the Class
M Certificates and Class B Certificates and (ii) to the extent such Excess
Bankruptcy Losses arise with respect to Discount Mortgage Loans, the Class A-PO
Certificates. If the aggregate of all Bankruptcy Losses incurred in the month
preceding the month of the related Distribution Date (the "Aggregate Current
Bankruptcy Losses") is less than or equal to the then applicable Bankruptcy Loss
Amount, no Bankruptcy Losses will be regarded as Excess Bankruptcy Losses. If
Aggregate Current Bankruptcy Losses exceed the then-applicable Bankruptcy Loss
Amount, a portion of each Bankruptcy Loss will be regarded as an "Excess
Bankruptcy Loss" in proportion to the ratio of (a) the excess of (i) Aggregate
Current Bankruptcy Losses over (ii) the then-applicable Bankruptcy Loss Amount,
to (b) the Aggregate Current Bankruptcy Losses. Thereafter, when the Bankruptcy
Loss Amount is zero, all Bankruptcy Losses will be regarded as Excess Bankruptcy
Losses. Upon initial issuance of the Series 1996-7
 
                                      S-54
<PAGE>
Certificates, the "Bankruptcy Loss Amount" with respect thereto will be equal to
approximately 0.07% (approximately $100,000) of the Cut-Off Date Aggregate
Principal Balance of the Mortgage Loans. As of any Distribution Date prior to
the first anniversary of the Cut-Off Date, the Bankruptcy Loss Amount will equal
the initial Bankruptcy Loss Amount minus the aggregate amount of Bankruptcy
Losses allocated solely to the Class B or Class M Certificates through the
related Determination Date. As of any Distribution Date on or after the first
anniversary of the Cut-Off Date, the Bankruptcy Loss Amount will equal the
excess, if any, of (1) the lesser of (a) the Bankruptcy Loss Amount as of the
business day next preceding the most recent anniversary of the Cut-Off Date and
(b) an amount, if any, calculated pursuant to the terms of the Pooling and
Servicing Agreement, which amount as calculated will provide for a reduction in
the Bankruptcy Loss Amount, over (2) the aggregate amount of Bankruptcy Losses
allocated solely to the Class B Certificates since such anniversary. The
Bankruptcy Loss Amount and the related coverage levels described above may be
reduced or modified upon written confirmation from Fitch and S&P that such
reduction or modification will not adversely affect the then-current ratings
assigned to the Class A and Class M Certificates by Fitch and S&P and the
then-current ratings assigned to the Offered Class B Certificates by Fitch. Such
a reduction or modification may adversely affect the coverage provided by
subordination with respect to Bankruptcy Losses. On and after the Cross-Over
Date, the Bankruptcy Loss Amount will be zero.
 
    Notwithstanding the foregoing, the provisions relating to subordination will
not be applicable in connection with a Bankruptcy Loss so long as the applicable
Servicer has notified the Trust Administrator and the Master Servicer in writing
that such Servicer is diligently pursuing any remedies that may exist in
connection with the representations and warranties made regarding the related
Mortgage Loan and when (A) the related Mortgage Loan is not in default with
regard to the payments due thereunder or (B) delinquent payments of principal
and interest under the related Mortgage Loan and any premiums on any applicable
Standard Hazard Insurance Policy and any related escrow payments in respect of
such Mortgage Loan are being advanced on a current basis by such Servicer, in
either case without giving effect to any Debt Service Reduction.
 
    Since the aggregate initial principal balance of the Class M and Class B
Certificates will be approximately $5,637,063, the risk of Special Hazard
Losses, Fraud Losses and Bankruptcy Losses will be separately borne by the Class
B Certificates and, after the principal balance of the Class B Certificates has
been reduced to zero, by the Class M Certificates to a lesser extent (I.E., only
up to the Special Hazard Loss Amount, Fraud Loss Amount and Bankruptcy Loss
Amount, respectively) than the risk of other Realized Losses, which will be
allocated first to the Class B Certificates and then the Class M Certificates to
the full extent of their initial principal balances. See "The Trust Estates --
Mortgage Loans -- Representations and Warranties" and "-- Insurance Policies,"
"Certain Legal Aspects of the Mortgage Loans -- Environmental Considerations"
and "Servicing of the Mortgage Loans -- Enforcement of Due-on-Sale Clauses;
Realization Upon Defaulted Mortgage Loans" in the Prospectus.
 
                                      S-55
<PAGE>
                      DESCRIPTION OF THE MORTGAGE LOANS(1)
 
GENERAL
 
    The Mortgage Loans to be included in the Trust Estate will be fixed interest
rate, conventional, monthly pay, fully amortizing, one- to four-family,
residential first mortgage loans having original terms to stated maturity
ranging from approximately 10 to approximately 15 years, which may include loans
secured by shares ("Co-op Shares") issued by private non-profit housing
corporations ("Cooperatives"), and the related proprietary leases or occupancy
agreements granting exclusive rights to occupy specified units in such
Cooperatives' buildings. The Mortgage Loans are expected to include 485
promissory notes, to have an aggregate unpaid principal balance as of the
Cut-Off Date (the "Cut-Off Date Aggregate Principal Balance") of approximately
$150,308,963 to be secured by first liens (the "Mortgages") on one- to
four-family residential properties (the "Mortgaged Properties") and to have the
additional characteristics described below and in the Prospectus.
 
    As of the Cut-Off Date, it is expected that none of the Mortgage Loans will
be Buy-Down Loans and that none of the Mortgage Loans will be secured by Co-op
Shares. See "The Trust Estates -- Mortgage Loans" in the Prospectus.
 
    Each of the Mortgage Loans is subject to a due-on-sale clause. See "Certain
Legal Aspects of the Mortgage Loans -- "Due-on-Sale' Clauses" and "Servicing of
the Mortgage Loans -- Enforcement of Due-on-Sale Clauses; Realization Upon
Defaulted Mortgage Loans" in the Prospectus.
 
    It is expected that nine Mortgage Loans, representing approximately 1.63% of
the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans, will be
Subsidy Loans. See "The Trust Estates -- Mortgage Loans" and "The Mortgage Loan
Programs -- Mortgage Loan Underwriting" in the Prospectus.
 
    It is expected that 67 of the Mortgage Loans, representing approximately
13.51% of the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans,
will be Mortgage Loans originated in connection with the relocation of employees
of various corporate employers which participated in Norwest Mortgage's
relocation program and of various nonparticipant employers ("Relocation Mortgage
Loans"). See "The Mortgage Loan Programs -- Mortgage Loan Production Sources" in
the Prospectus.
 
- ------------------------
(1)  The descriptions in this Prospectus Supplement of the Trust Estate and the
    properties securing the Mortgage Loans to be included in the Trust Estate
    are based upon the expected characteristics of the Mortgage Loans at the
    close of business on the Cut-Off Date, as adjusted for the scheduled
    principal payments due on or before such date. Notwithstanding the
    foregoing, any of such Mortgage Loans may be excluded from the Trust Estate
    (i) as a result of principal prepayment thereof in full or (ii) if, as a
    result of delinquencies or otherwise, the Seller otherwise deems such
    exclusion necessary or desirable. In either event, other Mortgage Loans may
    be included in the Trust Estate. The Seller believes that the information
    set forth herein with respect to the expected characteristics of the
    Mortgage Loans on the Cut-Off Date is representative of the characteristics
    as of the Cut-Off Date of the Mortgage Loans to be included in the Trust
    Estate as it will be constituted at the time the Series 1996-7 Certificates
    are issued, although the Cut-Off Date Aggregate Principal Balance, the range
    of Mortgage Interest Rates and maturities, and certain other characteristics
    of the Mortgage Loans in the Trust Estate may vary. In the event that any of
    the characteristics as of the Cut-Off Date of the Mortgage Loans that
    constitute the Trust Estate on the date of initial issuance of the Series
    1996-7 Certificates vary materially from those described herein, revised
    information regarding the Mortgage Loans will be made available to
    purchasers of the Offered Certificates, on or before such issuance date, and
    a Current Report on Form 8-K containing such information will be filed with
    the Securities and Exchange Commission within 15 days following such date.
 
                                      S-56
<PAGE>
    As of the Cut-Off Date, each Mortgage Loan is expected to have an unpaid
principal balance of not less than approximately $31,925 or more than
approximately $1,209,972, and the average unpaid principal balance of the
Mortgage Loans is expected to be approximately $309,915. The latest stated
maturity date of any of the Mortgage Loans is expected to be October 1, 2011;
however, the actual date on which any Mortgage Loan is paid in full may be
earlier than the stated maturity date due to unscheduled payments of principal.
Based on information supplied by the mortgagors in connection with their loan
applications at origination, 457 of the Mortgaged Properties, which secure
approximately 94.52% of the Cut-Off Date Aggregate Principal Balance of the
Mortgage Loans, are expected to be owner occupied primary residences and 28 of
the Mortgaged Properties, which secure approximately 5.48% of the Cut-Off Date
Aggregate Principal Balance of the Mortgage Loans, are expected to be second
homes. See "The Mortgage Loan Programs -- Mortgage Loan Underwriting" in the
Prospectus.
 
    As of the Cut-Off Date, there were 174 Discount Mortgage Loans having an
aggregate unpaid principal balance of approximately $55,575,934, a range of
unpaid principal balances of approximately $62,796 to approximately $969,260, an
average unpaid principal balance of approximately $319,402, a range of Mortgage
Interest Rates from 6.375% to 7.750% per annum, a weighted average Mortgage
Interest Rate of approximately 7.452% per annum, a range of remaining terms to
stated maturity of 114 months to 180 months, a weighted average remaining term
to stated maturity of approximately 176 months, a range of original
Loan-to-Value Ratios of 13.33% to 95.00%, a weighted average original
Loan-to-Value Ratio of approximately 70.35% and the following geographic
concentration of Mortgaged Properties securing Mortgage Loans in excess of 5.00%
of the aggregate unpaid principal balance of the Discount Mortgage Loans:
approximately 12.68% in California, 9.88% in New Jersey, 7.29% in Texas, 5.66%
in Virginia, 5.46% in Georgia, 5.42% in New York and 5.34% in Florida.
 
    As of the Cut-Off Date, there were 311 Mortgage Loans that were not Discount
Mortgage Loans (the "Premium Mortgage Loans") having an aggregate unpaid
principal balance of approximately $94,733,029, a range of unpaid principal
balances of approximately $31,925 to approximately $1,209,972, an average unpaid
principal balance of approximately $304,608, a range of Mortgage Interest Rates
from 7.875% to 9.250% per annum, a weighted average Mortgage Interest Rate of
approximately 8.190% per annum, a range of remaining terms to stated maturity of
115 months to 180 months, a weighted average remaining term to stated maturity
of approximately 177 months, a range of original Loan-to-Value Ratios of 21.82%
to 95.00%, a weighted average original Loan-to-Value Ratio of approximately
71.07% and the following geographic concentration of Mortgaged Properties
securing Mortgage Loans in excess of 5.00% of the aggregate unpaid principal
balance of the Premium Mortgage Loans: approximately 19.26% in California, 7.66%
in New Jersey, 7.60% in New York, 6.59% in Florida and 6.55% in Texas.
 
    The Mortgage Loans will have been acquired by the Seller from Norwest
Mortgage. The Mortgage Loans included in the Trust Estate consist of Mortgage
Loans originated by Norwest Mortgage or an affiliate or purchased by Norwest
Mortgage or an affiliate from various originators. See "Norwest Mortgage" in the
Prospectus. The Mortgage Loans that were not originated by Norwest Mortgage were
acquired by Norwest Mortgage or an affiliate from various entities (each, a
"Norwest Correspondent") which either originated the Mortgage Loans or acquired
the Mortgage Loans pursuant to mortgage loan purchase programs operated by such
Norwest Correspondents. Approximately 94.34% (by Cut-Off Date Aggregate
Principal Balance) of the Mortgage Loans were originated in conformity with the
underwriting standards described in the Prospectus under the heading "The
Mortgage Loan Programs -- Mortgage Loan Underwriting -- Norwest Mortgage
Underwriting" (the "Underwriting Standards") and as applied by Norwest Mortgage,
or by eligible originators to whom Norwest Mortgage had delegated all
underwriting functions. In certain instances, exceptions to the Underwriting
Standards may have been granted by Norwest Mortgage. See "The Mortgage Loan
Programs -- Mortgage Loan Underwriting" in the Prospectus. Aproximately 0.62%
(by Cut-Off Date Aggregate Principal Balance) of the Mortgage Loans (the "Pool
Certification Underwritten Loans") were reviewed by UGRIC to ensure compliance
with such company's credit, appraisal and underwriting
 
                                      S-57
<PAGE>
standards. Neither the Series 1996-7 Certificates nor any of the Mortgage Loans
are insured or guaranteed under a mortgage pool insurance policy issued by
UGRIC. The Pool Certification Underwritten Loans were evaluated using credit
scoring as described in the Prospectus under "The Mortgage Loan Programs --
Mortgage Loan Underwriting" and, based on the credit scores of such Mortgage
Loans, some of such Mortgage Loans were re-underwritten. The remaining
approximate 5.04% (by Cut-Off Date Aggregate Principal Balance) of the Mortgage
Loans (the "Bulk Purchase Underwritten Loans") will have been underwritten in
connection with bulk purchase transactions under varying standards which have
been reviewed by Norwest Mortgage, who determined that such varying standards
did not depart materially from the Underwriting Standards. Neither the Seller
nor Norwest Mortgage has underwritten any of the Bulk Purchase Underwritten
Loans. See "The Mortgage Loan Programs -- Mortgage Loan Underwriting" in the
Prospectus.
 
    As of September 17, 1996, as a result of a hurricane and related storms
(together, the "Hurricane"), 48 counties in North Carolina, 21 counties in
Virginia, 10 counties in West Virginia and 5 counties in Pennsylvania (the
"Hurricane Counties") were declared federal disaster areas eligible for federal
disaster assistance. It is expected that 14 Mortgage Loans, representing
approximately 2.62% of the Cut-Off Date Aggregate Principal Balance of the
Mortgage Loans will be located in the Hurricane Counties. In addition, other
counties may have been affected by the Hurricane.
 
    Based on information received by the Seller as of the date of this
Prospectus Supplement, as a result of wildfires (the "Wildfires"), 3 counties in
California (the "Wildfire Counties") were declared federal disaster areas
eligible for federal disaster assistance. It is expected that 27 Mortgage Loans,
representing approximately 5.74% of the Cut-Off Date Aggregate Principal Balance
of the Mortgage Loans will be located in the Wildfire Counties. In addition,
other counties may have been affected by the Wildfires, and such other counties
may ultimately be declared federal disaster areas.
 
    Based on information received by the Seller as of the date of this
Prospectus Supplement, as a result of floods (the "Northeast Floods"), 5
counties in Massachusetts (the "Flood Counties") were declared federal disaster
areas eligible for federal disaster assistance. It is expected that 13 Mortgage
Loans, representing approximately 2.05% of the Cut-Off Date Aggregate Principal
Balance of the Mortgage Loans will be located in the Flood Counties. In
addition, other counties may have been affected by the Northeast Floods, and
such other counties may ultimately be declared federal disaster areas.
 
    Neither the Seller nor Norwest Mortgage has undertaken the physical
inspection of any of the Mortgaged Properties. As a result, there can be no
assurance that material damage to any Mortgaged Property in the affected region
has not occurred. In the Pooling and Servicing Agreement, the Seller will
represent and warrant that, as of the date of issuance of the Certificates, each
Mortgaged Property is undamaged by flood, water, fire, earthquake or earth
movement, windstorm, tornado or similar casualty (excluding casualty from the
presence of hazardous wastes or hazardous substances, as to which the Seller
makes no representation) so as to adversely affect the value of such Mortgaged
Property as security for such Mortgage Loan or the use for which such premises
were intended. In the event of a breach of such representation with respect to a
Mortgaged Property, including by virtue of the Hurricane, the Wildfires and the
Northeast Floods, which materially and adversely affects the interests of
Certificateholders in the related Mortgage Loan, the Seller will be obligated to
repurchase or substitute for such Mortgage Loan, as described under "The
Mortgage Loan Programs -- Representations and Warranties" and "The Pooling and
Servicing Agreement -- Assignment of Mortgage Loans to the Trustee" in the
Prospectus. Repurchase of any such Mortgage Loan will affect in varying degrees
the yields and weighted average lives of the Subclasses and Class of Offered
Certificates and could adversely affect the yield of any Offered Certificates
purchased at a premium or the Class A-7 Certificate which has no principal
balance.
 
                                      S-58
<PAGE>
MORTGAGE LOAN DATA
 
    Set forth below is a description of certain additional expected
characteristics of the Mortgage Loans as of the Cut-Off Date (except as
otherwise indicated).
 
                            MORTGAGE INTEREST RATES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
MORTGAGE INTEREST RATE                  LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
6.375%.............................        2       $    632,596.74        0.42   %
6.625%.............................        3            900,832.29        0.60
6.750%.............................        7          1,918,523.17        1.28
6.875%.............................        3          1,112,156.64        0.74
7.000%.............................       10          3,873,613.69        2.58
7.125%.............................        6          1,786,247.98        1.19
7.250%.............................       14          4,800,427.00        3.19
7.375%.............................       18          5,119,014.64        3.41
7.500%.............................       28          7,969,502.11        5.30
7.625%.............................       33         11,591,862.23        7.71
7.750%.............................       50         15,871,157.34       10.56
7.875%.............................       63         20,377,510.11       13.56
8.000%.............................       53         15,548,075.88       10.34
8.125%.............................       45         13,484,281.91        8.97
8.250%.............................       58         19,719,121.31       13.12
8.375%.............................       25          7,391,093.95        4.92
8.500%.............................       31         10,148,736.58        6.75
8.625%.............................       12          3,064,511.27        2.04
8.750%.............................       15          3,340,181.64        2.22
8.875%.............................        4            853,866.01        0.57
9.000%.............................        2            306,126.64        0.20
9.125%.............................        2            439,835.17        0.29
9.250%.............................        1             59,688.77        0.04
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the weighted average Mortgage Interest Rate of the
Mortgage Loans is expected to be approximately 7.917% per annum. The Net
Mortgage Interest Rate of each Mortgage Loan will be equal to the Mortgage
Interest Rate of such Mortgage Loan minus the sum of (a) the applicable
Servicing Fee Rate, (b) the Master Servicing Fee Rate and (c) the Fixed Retained
Yield, if any, for such Mortgage Loan. As of the Cut-Off Date, the weighted
average Net Mortgage Interest Rate of the Mortgage Loans is expected to be
approximately 7.382% per annum.
                       MORTGAGE LOAN DOCUMENTATION LEVELS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
DOCUMENTATION LEVEL                     LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Full Documentation.................      356       $118,541,881.46       78.87   %
Income Verification................        2            328,363.38        0.22
Asset Verification.................       68         13,139,350.50        8.74
Preferred Processing...............       59         18,299,367.73       12.17
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    Documentation levels vary depending upon several factors, including loan
amount, Loan-to-Value Ratio and the type and purpose of the Mortgage Loan.
Asset, income and mortgage verifications were obtained for Mortgage Loans
processed with "full documentation." In the case of "preferred processing,"
neither asset nor income verifications were obtained. In most instances, a
verification of the borrower's employment was obtained. However, for all of the
Mortgage Loans, a credit report on the borrower and a property appraisal were
obtained. See "The Mortgage Loan Programs -- Mortgage Loan Underwriting" in the
Prospectus.
                       REMAINING TERMS TO STATED MATURITY
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
REMAINING STATED TERM (MONTHS)          LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
114................................        1       $    299,269.84        0.20   %
115................................        1            576,765.04        0.38
118................................        1            346,240.06        0.23
119................................        1             99,457.19        0.07
162................................        1            207,184.53        0.14
168................................        5          1,281,158.77        0.85
169................................        2            306,649.93        0.20
170................................        6          1,664,511.55        1.11
171................................        2            406,745.96        0.27
172................................       12          3,718,932.82        2.47
173................................        9          3,246,432.08        2.16
174................................       28          8,067,390.54        5.37
175................................       24          8,359,938.84        5.56
176................................       27          9,046,761.03        6.02
177................................       89         27,111,555.06       18.04
178................................      126         38,188,701.62       25.41
179................................      117         37,037,110.21       24.64
180................................       33         10,344,158.00        6.88
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the weighted average remaining term to stated
maturity of the Mortgage Loans is expected to be approximately 177 months.
 
                              YEARS OF ORIGINATION
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
YEAR OF ORIGINATION                     LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
1994...............................        1       $    261,497.90        0.17   %
1995...............................       16          3,866,250.74        2.57
1996...............................      468        146,181,214.43       97.26
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    It is expected that the earliest month and year of origination of any
Mortgage Loan was July 1994 and the latest month and year of origination was
September 1996.
 
                              MORTGAGED PROPERTIES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
PROPERTY                                LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Single-family detached.............      446       $138,969,957.66       92.46   %
Two- to four-family units..........        2            340,251.04        0.23
Condominiums
  High-rise(greater than four
   stories)........................        3            592,701.13        0.39
  Low-rise(four stories or less)...       13          3,668,373.43        2.44
Planned unit developments..........       21          6,737,679.81        4.48
Townhouses.........................        0                  0.00        0.00
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
                                      S-59
<PAGE>
                         ORIGINAL LOAN-TO-VALUE RATIOS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
ORIGINAL LOAN-TO- VALUE RATIO           LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
50% or less........................       44       $ 10,530,428.18        7.01   %
50.01- 55.00%......................       23          7,589,816.20        5.05
55.01- 60.00%......................       40         12,659,042.19        8.42
60.01- 65.00%......................       38         13,567,459.68        9.03
65.01- 70.00%......................       59         17,298,078.56       11.51
70.01- 75.00%......................       55         18,770,875.79       12.49
75.01- 80.00%......................      170         54,984,784.56       36.57
80.01- 85.00%......................        9          2,452,814.10        1.63
85.01- 90.00%......................       42         11,224,671.92        7.47
90.01- 95.00%......................        5          1,230,991.89        0.82
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the minimum and maximum Loan-to-Value Ratios at
origination of the Mortgage Loans are expected to be 13.33% and 95.00%,
respectively, and the weighted average Loan-to-Value Ratio at origination of the
Mortgage Loans is expected to be approximately 70.80%. The Loan-to-Value Ratio
of a Mortgage Loan is calculated using the lesser of (i) the appraised value of
the related Mortgaged Property, as established by an appraisal obtained by the
originator from an appraiser at the time of origination and (ii) the sale price
for such property. See "The Trust Estates -- Mortgage Loans" in the Prospectus.
No assurance can be given that the values of the Mortgaged Properties securing
the Mortgage Loans have remained or will remain at the levels used in
calculating the Loan-to-Value Ratios shown above. See "Risk Factors -- Risks of
the Mortgage Loans" in the Prospectus. It is expected that 10 of the Mortgage
Loans having Loan-to-Value Ratios at origination in excess of 80%, representing
approximately 1.72% (by Cut-Off Date Aggregate Principal Balance) of the
Mortgage Loans, were originated without primary mortgage insurance.
 
                   ORIGINAL MORTGAGE LOAN PRINCIPAL BALANCES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
ORIGINAL MORTGAGE LOAN PRINCIPAL      MORTGAGE        PRINCIPAL       PRINCIPAL
BALANCE                                 LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Less than or equal to $200,000.....       51       $  5,041,141.77        3.35   %
$200,001-$250,000..................       96         22,149,712.39       14.74
$250,001-$300,000..................      129         35,210,318.92       23.43
$300,001-$350,000..................       78         25,082,681.72       16.69
$350,001-$400,000..................       50         18,917,930.59       12.59
$400,001-$450,000..................       21          8,999,338.10        5.99
$450,001-$500,000..................       27         13,066,370.90        8.69
$500,001-$550,000..................        8          4,205,250.73        2.80
$550,001-$600,000..................        7          4,004,442.38        2.66
$600,001-$650,000..................       11          7,048,157.53        4.69
$650,001-$700,000..................        1            628,045.55        0.42
$800,001-$850,000..................        1            815,155.51        0.54
$950,001-$1,000,000................        4          3,930,445.38        2.61
Over $ 1 Million...................        1          1,209,971.60        0.80
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the average unpaid principal balance of the Mortgage
Loans is expected to be approximately $309,915. As of the Cut-Off Date, the
weighted average Loan-to-Value Ratio at origination and the maximum
Loan-to-Value Ratio at origination of the Mortgage Loans which had original
principal balances in excess of $600,000 are expected to be approximately 63.25%
and 80.00%, respectively. See "The Trust Estates -- Mortgage Loans" in the
Prospectus.
 
                GEOGRAPHIC DISTRIBUTION OF MORTGAGED PROPERTIES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
GEOGRAPHIC AREA                         LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Alabama............................        2       $    557,525.82        0.37   %
Arizona............................       12          4,187,735.75        2.79
Arkansas...........................        6          1,649,857.27        1.10
California.........................       77         25,292,729.73       16.81
Colorado...........................       18          5,936,864.57        3.95
Connecticut........................        6          1,877,427.14        1.25
District of Columbia...............        2            552,801.19        0.37
Florida............................       30          9,216,116.43        6.13
Georgia............................       17          4,442,307.72        2.96
Hawaii.............................        2          2,176,829.32        1.45
Idaho..............................        1            269,611.80        0.18
Illinois...........................       21          5,934,494.24        3.95
Indiana............................        1            541,908.62        0.36
Iowa...............................        2            489,028.60        0.33
Kansas.............................        3            937,855.43        0.62
Kentucky...........................        3          1,195,200.73        0.80
Louisiana..........................        4            854,981.96        0.57
Maryland...........................        8          2,976,745.13        1.98
Massachusetts......................       13          3,079,168.86        2.05
Michigan...........................        2            770,701.15        0.51
Minnesota..........................       15          4,548,651.94        3.03
Missouri...........................        4          1,247,554.38        0.83
Montana............................        1            256,593.19        0.17
Nebraska...........................        3            811,052.73        0.54
Nevada.............................        7          2,688,551.85        1.79
New Hampshire......................        3            957,004.07        0.64
New Jersey.........................       45         12,751,543.42        8.48
New Mexico.........................        1            287,920.67        0.19
New York...........................       36         10,214,221.27        6.80
North Carolina.....................       13          4,065,720.88        2.70
North Dakota.......................        1            396,584.92        0.26
Ohio...............................        6          2,059,185.79        1.37
Oklahoma...........................        2            647,610.04        0.43
Oregon.............................       13          3,577,538.52        2.38
Pennsylvania.......................       14          3,982,482.86        2.65
Rhode Island.......................        1            314,428.55        0.21
South Carolina.....................        4            851,570.21        0.57
South Dakota.......................        1            271,059.87        0.18
Tennessee..........................       13          3,879,368.04        2.58
Texas..............................       29         10,260,360.34        6.83
Utah...............................       11          3,764,521.23        2.50
Vermont............................        2            628,117.97        0.42
Virginia...........................       16          4,801,755.85        3.19
Washington.........................       12          3,400,443.07        2.26
Wisconsin..........................        2            705,229.95        0.47
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    No more than approximately 1.15% of the Cut-Off Date Aggregate Principal
Balance of the Mortgage Loans is expected to be secured by Mortgaged Properties
located in any one five-digit zip code.
 
                                      S-60
<PAGE>
                         ORIGINATORS OF MORTGAGE LOANS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
ORIGINATOR                              LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
NMI or Affiliate...................      270       $ 85,164,800.91       56.66   %
Other Originators..................      215         65,144,162.16       43.34
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    It is expected that, as of the Mortgage Loan Cut-Off Date one of the "Other
Originators" will have accounted for approximately 10.26% of the Cut-Off Date
Aggregate Principal Balance. No other single "Other Originator" is expected to
have accounted for more than 5.00% of the Mortgage Loan Cut-Off Date Aggregate
Principal Balance.
 
                           PURPOSES OF MORTGAGE LOANS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                      NUMBER OF        UNPAID         AGGREGATE
                                      MORTGAGE        PRINCIPAL       PRINCIPAL
LOAN PURPOSE                            LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Purchase...........................      331       $101,187,438.66       67.32   %
Equity Take Out Refinance..........       32          8,061,002.57        5.36
Rate/Term Refinance................      122         41,060,521.84       27.32
                                         ---       ---------------     -------
        Total......................      485       $150,308,963.07      100.00   %
                                         ---       ---------------     -------
                                         ---       ---------------     -------
</TABLE>
 
    In general, in the case of a Mortgage Loan made for "rate/ term" refinance
purposes, substantially all of the proceeds are used to pay in full the
principal balance of a previous mortgage loan of the mortgagor with respect to a
Mortgaged Property and to pay origination and closing costs associated with such
refinancing. However, in the case of a Mortgage Loan made for "equity take out"
refinance purposes, all or a portion of the proceeds are generally retained by
the mortgagor for uses unrelated to the Mortgaged Property. The amount of such
proceeds retained by the mortgagor may be substantial. See "The Trust Estates --
Mortgage Loans" and "The Mortgage Loan Programs -- Mortgage Loan Underwriting"
in the Prospectus.
 
MANDATORY REPURCHASE OR SUBSTITUTION OF MORTGAGE LOANS
 
    The Seller is required, with respect to Mortgage Loans that are found by the
Trustee to have defective documentation, or in respect of which the Seller has
breached a representation or warranty, either to repurchase such Mortgage Loans
or, if within two years of the date of initial issuance of the Series 1996-7
Certificates, to substitute new Mortgage Loans therefor. Any Mortgage Loan so
substituted must, among other things, have an unpaid principal balance equal to
or less than the Scheduled Principal Balance of the Mortgage Loan for which it
is being substituted (after giving effect to the scheduled principal payment due
in the month of substitution on the Mortgage Loan for which a new Mortgage Loan
is being substituted), a Loan-to-Value Ratio less than or equal to, and a
Mortgage Interest Rate equal to that of the Mortgage Loan for which it is being
substituted. See "Prepayment and Yield Considerations" herein and "The Pooling
and Servicing Agreement -- Assignment of Mortgage Loans to the Trustee" in the
Prospectus.
 
OPTIONAL REPURCHASE OF DEFAULTED MORTGAGE LOANS
 
    Subject to certain limitations, the Seller may, in its sole discretion,
repurchase any defaulted Mortgage Loan, or any Mortgage Loan as to which default
is reasonably foreseeable, from the Trust Estate at a price equal to the unpaid
principal balance of such Mortgage Loan, together with accrued interest at a
rate equal to the Mortgage Interest Rate through the last day of the month in
which such repurchase occurs. See "The Pooling and Servicing Agreement --
Optional Purchases" in the Prospectus. A Servicer may, in its sole discretion,
allow the assumption of a defaulted Mortgage Loan serviced by such Servicer,
subject to certain conditions specified in the applicable Underlying Servicing
Agreement, or encourage the refinancing of a defaulted Mortgage Loan. See
"Prepayment and Yield Considerations" herein and "Servicing of the Mortgage
Loans -- Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage
Loans" in the Prospectus.
 
                     DELINQUENCY AND FORECLOSURE EXPERIENCE
 
    The following tables set forth certain information concerning recent
delinquency, foreclosure and loan loss experience on (i) the conventional
mortgage loans included in various mortgage pools underlying all series of The
Prudential Home Mortgage Securities Company, Inc.'s or NASCOR's mortgage
pass-through certificates or mortgage loans owned by third-party,
non-governmental entities included in Norwest Mortgage's servicing portfolio and
serviced from Norwest Mortgage's servicing center located in Frederick,
Maryland, which mortgage loans either (A) were originated by Norwest Mortgage
for its own account or the account of an affiliate, which (B) were acquired by
Norwest Mortgage for its own account or the account of an affiliate, or (C) are
loans as to which
 
                                      S-61
<PAGE>
Norwest Mortgage acquired the servicing rights or as to which Norwest Mortgage
acts as subservicer (collectively, the "NMI Frederick Portfolio Loans"), (ii)
the NMI Frederick Portfolio Loans which are fixed interest rate mortgage loans
(the "Fixed NMI Frederick Portfolio Loans"), including, in both clause (i) and
this clause (ii) mortgage loans originated in connection with the purchases of
residences by relocated employees ("Relocation Mortgage Loans"), (iii) the Fixed
NMI Frederick Portfolio Loans, other than Relocation Mortgage Loans, having
original terms to maturity of 15 years (the "Fixed 15-Year Non-relocation NMI
Frederick Portfolio Loans"), (iv) the conventional mortgage loans having an
original principal balance in excess of the principal balance acceptable for
purchase by FNMA or FHLMC ("Jumbo Loans") included in Norwest Mortgage's
servicing portfolio and serviced from servicing centers other than in Frederick,
Maryland (the "NMI Non-Frederick Portfolio Loans") and (v) the NMI Non-Frederick
Portfolio Loans which are fixed interest rate Jumbo Loans having original terms
to maturity of 15 years (the "Fixed 15-Year NMI Non-Frederick Portfolio Loans"),
including in both clause (iv) and this clause (v) Relocation Mortgage Loans. On
May 7, 1996 Norwest Mortgage and an affiliate acquired from The Prudential Home
Mortgage Company, Inc. ("PHMC") certain mortgage loans and a substantial portion
of PHMC's mortgage servicing portfolio (such transaction, the "PHMC
Acquisition"). Mortgage loans previously included in PHMC's mortgage servicing
portfolio became serviced or subserviced by Norwest Mortgage on May 7, 1996 and,
to the extent described above, are included in the NMI Frederick Portfolio
Loans. Prior to May 7, 1996 such mortgage loans were serviced by PHMC. See
"Description of the Mortgage Loans" herein and "The Mortgage Loan Programs --
Mortgage Loan Underwriting" in the Prospectus. The delinquency, foreclosure and
loan loss experience represents the recent experience of Norwest Mortgage and,
in the case of NMI Frederick Portfolio Loans prior to May 7, 1996, PHMC. There
can be no assurance that the delinquency, foreclosure and loan loss experience
set forth with respect to the NMI Frederick Portfolio Loans or NMI Non-Frederick
Portfolio Loans, which include both fixed and adjustable interest rate mortgage
loans and loans having a variety of original terms to stated maturity including
Relocation Mortgage Loans and non-relocation mortgage loans, and the Fixed NMI
Frederick Portfolio Loans, Fixed 15-Year NMI Non-Frederick Portfolio Loans or
Fixed 15-Year Non-relocation NMI Frederick Portfolio Loans, each of which
includes loans having a variety of payment characteristics, such as Subsidy
Loans, Buy-Down Loans and Balloon Loans, will be representative of the results
that may be experienced with respect to the Mortgage Loans included in the Trust
Estate.
 
    Historically, Relocation Mortgage Loans, which constitute a significant
percentage of the NMI Frederick Portfolio Loans, have experienced a
significantly lower rate of delinquency and foreclosure than other mortgage
loans included in the NMI Frederick Portfolio Loans, NMI Non-Frederick Portfolio
Loans, Fixed NMI Frederick Portfolio Loans and Fixed 15-Year NMI Non-Frederick
Portfolio Loans. There can be no assurance that the future experience on the
Mortgage Loans contained in the Trust Estate, all of which are fixed interest
rate mortgage loans having original terms to stated maturity ranging from
approximately 10 to approximately 15 years and approximately 13.51% by Cut-Off
Date Aggregate Principal Balance of which are Relocation Mortgage Loans, will be
comparable to that of the NMI Frederick Portfolio Loans, the NMI Non-Frederick
Portfolio Loans, the Fixed NMI Frederick Portfolio Loans, the Fixed 15-Year NMI
Non-Frederick Portfolio Loans or the Fixed 15-Year Non-relocation NMI Frederick
Portfolio Loans.
 
    Delinquencies, foreclosures and loan losses generally are expected to occur
more frequently after the first full year of the life of mortgage loans.
Accordingly, because a large number of mortgage loans serviced by Norwest
Mortgage have been recently originated, the current level of delinquencies,
foreclosures and loan losses may not be representative of the levels which may
be experienced over the lives of such mortgage loans. If the volume of Norwest
Mortgage's new loan originations and acquisitions does not continue to grow at
the rate experienced in recent years, the levels of delinquencies, foreclosures
and loan losses as percentages of the portfolio of NMI Frederick Portfolio Loans
and NMI Non-Frederick Portfolio Loans could rise significantly above the rates
indicated in the following tables.
 
                                      S-62
<PAGE>
                      TOTAL NMI FREDERICK PORTFOLIO LOANS
 
<TABLE>
<CAPTION>
                                                 BY DOLLAR               BY DOLLAR               BY DOLLAR
                                      BY NO.      AMOUNT      BY NO.      AMOUNT      BY NO.      AMOUNT
                                     OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                            AS OF                   AS OF                   AS OF
                                      DECEMBER 31, 1994       DECEMBER 31, 1995         JUNE 30, 1996
                                    ----------------------  ----------------------  ----------------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                 <C>          <C>        <C>          <C>        <C>          <C>
Total NMI Frederick Portfolio
 Loans............................     145,339   $37,213,000    147,478  $36,537,000    143,949  $35,319,000
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                    -----------  ---------  -----------  ---------  -----------  ---------
 
Period of Delinquency (1)
  30 to 59 days...................       1,165   $ 303,741       1,502   $ 359,137       1,561   $ 368,529
  60 to 89 days...................         294      75,871         310      75,162         301      70,500
  90 days or more.................         697     217,595         277      77,103         233      61,139
                                    -----------  ---------  -----------  ---------  -----------  ---------
Total Delinquent Loans............       2,156   $ 597,207       2,089   $ 511,402       2,095   $ 500,168
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                    -----------  ---------  -----------  ---------  -----------  ---------
 
Percent of NMI Frederick Portfolio
 Loans............................        1.48%      1.60%        1.42%      1.40%        1.46%      1.42%
</TABLE>
<TABLE>
<CAPTION>
                                                AS OF               AS OF               AS OF
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
<S>                                       <C>                 <C>                 <C>
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
Foreclosures (2)........................  $  277,406          $  346,096          $  331,150
Foreclosure Ratio (3)...................       0.75%               0.95%               0.94%
 
<CAPTION>
 
                                             YEAR ENDED          YEAR ENDED       SIX MONTHS ENDED
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Net Gain (Loss) (4).....................  $  (95,087)         $ (150,948)         $  (72,192)
Net Gain (Loss) Ratio (5)...............       (0.26)%             (0.41)%             (0.20)%
</TABLE>
 
                      FIXED NMI FREDERICK PORTFOLIO LOANS
 
<TABLE>
<CAPTION>
                                                 BY DOLLAR               BY DOLLAR               BY DOLLAR
                                      BY NO.     AMOUNT OF    BY NO.     AMOUNT OF    BY NO.     AMOUNT OF
                                     OF LOANS      LOANS     OF LOANS      LOANS     OF LOANS      LOANS
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                            AS OF                   AS OF                   AS OF
                                      DECEMBER 31, 1994       DECEMBER 31, 1995         JUNE 30, 1996
                                    ----------------------  ----------------------  ----------------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                 <C>          <C>        <C>          <C>        <C>          <C>
Total Fixed NMI Frederick
 Portfolio Loans..................     112,820   $28,295,000    119,734  $29,152,000    119,907  $28,988,000
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                    -----------  ---------  -----------  ---------  -----------  ---------
 
Period of Delinquency (1)
  30 to 59 days...................         781   $ 195,686       1,073   $ 241,976       1,175   $ 265,414
  60 to 89 days...................         192      46,754         200      44,225         195      43,849
  90 days or more.................         424     127,441         171      46,094         148      36,818
                                    -----------  ---------  -----------  ---------  -----------  ---------
Total Delinquent Loans............       1,397     369,881       1,444     332,295       1,518     346,081
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                    -----------  ---------  -----------  ---------  -----------  ---------
 
Percent of Fixed NMI Frederick
 Portfolio Loans..................        1.24%       1.31%       1.21%       1.14%       1.27%       1.19%
</TABLE>
<TABLE>
<CAPTION>
                                                AS OF               AS OF               AS OF
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
<S>                                       <C>                 <C>                 <C>
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
Foreclosures (2)........................  $  151,448          $  186,359          $  177,894
Foreclosure Ratio (3)...................       0.54%               0.64%               0.61%
 
<CAPTION>
 
                                             YEAR ENDED          YEAR ENDED       SIX MONTHS ENDED
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Net Gain (Loss) (4).....................  $  (78,867)         $ (115,100)         $  (52,137)
Net Gain (Loss) Ratio (5)...............       (0.28)%             (0.39)%             (0.18)%
</TABLE>
 
- ----------------------------------
(1)  The indicated periods of delinquency are based on the number of days past
     due, based on a 30-day month. No mortgage loan is considered delinquent for
     these purposes until one month has passed since its contractual due date. A
     mortgage loan is no longer considered delinquent once foreclosure
     proceedings have commenced.
 
(2)  Includes loans in the applicable portfolio for which foreclosure
     proceedings had been instituted or with respect to which the related
     property had been acquired as of the dates indicated.
 
(3)  Foreclosures as a percentage of total loans in the applicable portfolio at
     the end of each period.
 
(4)  Does not include gain or loss with respect to loans in the applicable
     portfolio for which foreclosure proceedings had been instituted but not
     completed as of the dates indicated, or for which the related properties
     have been acquired in foreclosure proceedings but not yet sold.
 
(5)  Net gain (loss) as a percentage of total loans in the applicable portfolio
     at the end of each period.
 
                                      S-63
<PAGE>
           FIXED 15-YEAR NON-RELOCATION NMI FREDERICK PORTFOLIO LOANS
 
<TABLE>
<CAPTION>
                                                   BY DOLLAR               BY DOLLAR               BY DOLLAR
                                        BY NO.      AMOUNT      BY NO.      AMOUNT      BY NO.      AMOUNT
                                       OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS
                                      -----------  ---------  -----------  ---------  -----------  ---------
                                              AS OF                   AS OF                   AS OF
                                        DECEMBER 31, 1994       DECEMBER 31, 1995         JUNE 30, 1996
                                      ----------------------  ----------------------  ----------------------
                                                          (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                   <C>          <C>        <C>          <C>        <C>          <C>
Total Fixed 15-Year Non-relocation
 NMI Frederick Portfolio Loans......      29,768   $6,919,000     29,809   $6,539,000     29,709   $6,413,000
                                      -----------  ---------  -----------  ---------  -----------  ---------
                                      -----------  ---------  -----------  ---------  -----------  ---------
 
Period of Delinquency (1)
  30 to 59 days.....................         127   $  29,066         186   $  37,219         197   $  38,338
  60 to 89 days.....................          24       5,451          37       6,810          25       5,240
  90 days or more...................          47      13,550          20       5,780          18       5,345
                                      -----------  ---------  -----------  ---------  -----------  ---------
Total Delinquent Loans..............         198   $  48,067         243   $  49,809         240   $  48,923
                                      -----------  ---------  -----------  ---------  -----------  ---------
                                      -----------  ---------  -----------  ---------  -----------  ---------
 
Percent of Fixed 15-Year
 Non-relocation NMI Frederick
 Portfolio Loans....................        0.67%      0.69%        0.82%      0.76%        0.81%      0.76%
</TABLE>
<TABLE>
<CAPTION>
                                                AS OF               AS OF               AS OF
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Foreclosures (2)........................  $   10,204          $   16,821          $   17,281
Foreclosure Ratio (3)...................       0.15%               0.26%               0.27%
 
<CAPTION>
 
                                             YEAR ENDED          YEAR ENDED       SIX MONTHS ENDED
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Net Gain (Loss) (4).....................  $   (3,080)         $   (6,781)         $   (2,088)
Net Gain (Loss) Ratio (5)...............       (0.04)%             (0.10)%             (0.03)%
</TABLE>
 
                    TOTAL NMI NON-FREDERICK PORTFOLIO LOANS
 
<TABLE>
<CAPTION>
                                                 BY DOLLAR               BY DOLLAR               BY DOLLAR
                                      BY NO.      AMOUNT      BY NO.      AMOUNT      BY NO.      AMOUNT
                                     OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                            AS OF                   AS OF                   AS OF
                                      DECEMBER 31, 1994       DECEMBER 31, 1995         JUNE 30, 1996
                                    ----------------------  ----------------------  ----------------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                 <C>          <C>        <C>          <C>        <C>          <C>
Total NMI Non-Frederick Portfolio
 Loans............................      15,516   $4,348,072     27,984   $7,811,431     33,949   $9,358,116
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                    -----------  ---------  -----------  ---------  -----------  ---------
 
Period of Delinquency (1)
  30 to 59 days...................         125   $  38,300         330   $  96,145         380   $ 107,043
  60 to 89 days...................          56       9,404          68      21,389          70      19,621
  90 days or more.................          31       9,972          97      30,867          73      23,403
                                    -----------  ---------  -----------  ---------  -----------  ---------
Total Delinquent Loans............         212   $  57,676         495   $ 148,401         523   $ 150,067
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                    -----------  ---------  -----------  ---------  -----------  ---------
 
Percent of NMI Non-Frederick
 Portfolio Loans..................        1.37%      1.33%        1.77%      1.90%        1.54%      1.60%
</TABLE>
<TABLE>
<CAPTION>
                                                AS OF               AS OF               AS OF
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Foreclosures (2)........................  $    9,755          $   30,626          $   37,421
Foreclosure Ratio (3)...................       0.22%               0.39%               0.40%
 
<CAPTION>
 
                                             YEAR ENDED          YEAR ENDED       SIX MONTHS ENDED
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Net Gain (Loss) (4).....................  $     (982)         $   (1,530)         $   (1,582)
Net Gain (Loss) Ratio (5)...............       (0.02)%             (0.02)%             (0.02)%
</TABLE>
 
- ----------------------------------
(1)  The indicated periods of delinquency are based on the number of days past
     due, based on a 30-day month. No mortgage loan is considered delinquent for
     these purposes until one month has passed since its contractual due date. A
     mortgage loan is no longer considered delinquent once foreclosure
     proceedings have commenced.
 
(2)  Includes loans in the applicable portfolio for which foreclosure
     proceedings had been instituted or with respect to which the related
     property had been acquired as of the dates indicated.
 
(3)  Foreclosures as a percentage of total loans in the applicable portfolio at
     the end of each period.
 
(4)  Does not include gain or loss with respect to loans in the applicable
     portfolio for which foreclosure proceedings had been instituted but not
     completed as of the dates indicated, or for which the related properties
     have been acquired in foreclosure proceedings but not yet sold.
 
(5)  Net gain (loss) as a percentage of total loans in the applicable portfolio
     at the end of each period.
 
                                      S-64
<PAGE>
                FIXED 15-YEAR NMI NON-FREDERICK PORTFOLIO LOANS
 
<TABLE>
<CAPTION>
                                            AS OF                   AS OF                   AS OF
                                      DECEMBER 31, 1994       DECEMBER 31, 1995         JUNE 30, 1996
                                    ----------------------  ----------------------  ----------------------
                                                 BY DOLLAR               BY DOLLAR               BY DOLLAR
                                      BY NO.     AMOUNT OF    BY NO.     AMOUNT OF    BY NO.     AMOUNT OF
                                     OF LOANS      LOANS     OF LOANS      LOANS     OF LOANS      LOANS
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                 <C>          <C>        <C>          <C>        <C>          <C>
Total Fixed 15-Year NMI
 Non-Frederick Portfolio Loans....       1,631   $ 446,811       3,113   $ 819,650       4,048   $1,061,477
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                    -----------  ---------  -----------  ---------  -----------  ---------
 
Period of Delinquency (1)
  30 to 59 days...................           5   $   1,476          17   $   4,057          24   $   7,030
  60 to 89 days...................           0           0           4         833           0           0
  90 days or more.................           0           0           2         229           1         206
                                    -----------  ---------  -----------  ---------  -----------  ---------
Total Delinquent Loans............           5   $   1,476          23   $   5,119          25   $   7,236
                                    -----------  ---------  -----------  ---------  -----------  ---------
                                    -----------  ---------  -----------  ---------  -----------  ---------
 
Percent of Fixed 15-Year NMI
 Non-Frederick Portfolio Loans....        0.31%       0.33%       0.74%       0.62%       0.62%       0.68%
</TABLE>
 
<TABLE>
<CAPTION>
                                                AS OF               AS OF               AS OF
                                          DECEMBER 31, 1994   DECEMBER 31, 1995     JUNE 30, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Foreclosures (2)........................  $        0          $    1,501          $    1,266
Foreclosure Ratio (3)...................       0.00%               0.18%               0.12%
</TABLE>
 
- ----------------------------------
(1)  The indicated periods of delinquency are based on the number of days past
     due, based on a 30-day month. No mortgage loan is considered delinquent for
     these purposes until one month has passed since its contractual due date. A
     mortgage loan is no longer considered delinquent once foreclosure
     proceedings have commenced.
 
(2)  Includes loans in the applicable portfolio for which foreclosure
     proceedings had been instituted or with respect to which the related
     property had been acquired as of the dates indicated.
 
(3)  Foreclosures as a percentage of total loans in the applicable portfolio at
     the end of each period.
 
(4)  Does not include gain or loss with respect to loans in the applicable
     portfolio for which foreclosure proceedings had been instituted but not
     completed as of the dates indicated, or for which the related properties
     have been acquired in foreclosure proceedings but not yet sold.
 
(5)  Net gain (loss) as a percentage of total loans in the applicable portfolio
     at the end of each period.
 
    The likelihood that a mortgagor will become delinquent in the payment of his
or her mortgage loan, the rate of any subsequent foreclosures, and the severity
of any loan loss experience, may be affected by a number of factors related to a
borrower's personal circumstances, including, but not limited to, unemployment
or change in employment (or in the case of self-employed mortgagors or
mortgagors relying on commission income, fluctuations in income), marital
separation and the mortgagor's equity in the related mortgaged property. In
addition, delinquency, foreclosure and loan loss experience may be sensitive to
adverse economic conditions, either nationally or regionally, may exhibit
seasonal variations and may be influenced by the level of interest rates and
servicing decisions on the applicable mortgage loans. Regional economic
conditions (including declining real estate values) may particularly affect
delinquency, foreclosure and loan loss experience on mortgage loans to the
extent that mortgaged properties are concentrated in certain geographic areas.
Furthermore, the level of foreclosures reported is affected by the length of
time legally required to complete the foreclosure process and take title to the
related property, which varies from jurisdiction to jurisdiction. The changes in
the delinquency, foreclosure and loan loss experience of Norwest Mortgage's
servicing portfolio during the periods set forth in the preceding table may be
attributable to factors such as those described above, although there can be no
assurance as to whether these changes are the result of any particular factor or
a combination of factors. The delinquency, foreclosure and loan loss experience
on the Mortgage Loans serviced by Norwest Mortgage may be particularly affected
to the extent that the related Mortgaged Properties are concentrated in areas
which experience adverse economic conditions or declining real estate values.
See "Description of the Mortgage Loans" in the Prospectus Supplement.
 
                                      S-65
<PAGE>
                      PREPAYMENT AND YIELD CONSIDERATIONS
 
    The rate of distributions in reduction of the principal balance of any
Subclass or Class of the Offered Certificates, the aggregate amount of
distributions on any Subclass or Class of the Offered Certificates and the yield
to maturity of any Subclass or Class of the Offered Certificates purchased at a
discount or premium will be directly related to the rate of payments of
principal on the Mortgage Loans in the Trust Estate and the amount and timing of
mortgagor defaults resulting in Realized Losses. The rate of principal payments
on the Mortgage Loans will in turn be affected by the amortization schedules of
the Mortgage Loans, the rate of principal prepayments (including partial
prepayments and those resulting from refinancing) thereon by mortgagors,
liquidations of defaulted Mortgage Loans, repurchases by the Seller of Mortgage
Loans as a result of defective documentation or breaches of representations and
warranties and optional purchases by the Seller of all of the Mortgage Loans in
connection with the termination of the Trust Estate. See "Description of the
Mortgage Loans -- Mandatory Repurchase or Substitution of Mortgage Loans" and
"Pooling and Servicing Agreement -- Optional Termination" herein and "The
Pooling and Servicing Agreement -- Assignment of Mortgage Loans to the Trustee,"
"-- Optional Purchases" and "-- Termination; Purchase of Mortgage Loans" in the
Prospectus. Mortgagors are permitted to prepay the Mortgage Loans, in whole or
in part, at any time without penalty. As described under "Description of the
Certificates -- Principal (Including Prepayments)" herein, all or a
disproportionate percentage of principal prepayments on the Mortgage Loans
(including liquidations and repurchases of Mortgage Loans) will be distributed,
to the extent of the Non-PO Fraction, to the holders of the Class A Certificates
(other than the Class A-PO Certificates) then entitled to distributions in
respect of principal during the nine years beginning on the first Distribution
Date, and, to the extent that such principal prepayments are made in respect of
a Discount Mortgage Loan, to the Class A-PO Certificates in proportion to the
interest of the Class A-PO Certificates in such Discount Mortgage Loan
represented by the PO Fraction. As a result of the method of calculating the
Class A-4 Priority Amount and the priorities for the allocation of the Class A
Non-PO Principal Distribution Amount, it is expected that, absent an
exceptionally high rate of principal prepayments on the Mortgage Loans, no
principal prepayments will be allocated to the Class A-4 Certificates during the
first five years following the issuance of the Series 1996-7 Certificates and
that, while the percentage of principal prepayments allocated to the Class A-4
Certificates during the four years thereafter will gradually increase, such
percentage, until the tenth year following the issuance of the Series 1996-7
Certificates, will be disproportionately lower than the percentage of such
principal prepayments allocated to the other Class A Certificates (other than
the Class A-PO Certificates). See "Description of the Certificates -- Principal
(Including Prepayments) -- Allocation of Amount to be Distributed." Prepayments
(which, as used herein, include all unscheduled payments of principal, including
payments as the result of liquidations, purchases and repurchases) of the
Mortgage Loans in the Trust Estate will result in distributions to
Certificateholders then entitled to distributions in respect of principal of
amounts which would otherwise be distributed over the remaining terms of such
Mortgage Loans. Since the rate of prepayment on the Mortgage Loans will depend
on future events and a variety of factors (as described more fully below and in
the Prospectus under "Prepayment and Yield Considerations"), no assurance can be
given as to such rate or the rate of principal payments on any Subclass or Class
of the Offered Certificates or the aggregate amount of distributions on any
Subclass or Class of the Offered Certificates.
 
    The rate of payments (including prepayments) on pools of mortgage loans is
influenced by a variety of economic, geographic, social and other factors. If
prevailing rates for similar mortgage loans fall below the Mortgage Interest
Rates on the Mortgage Loans, the rate of prepayment would generally be expected
to increase. Conversely, if interest rates on similar mortgage loans rise above
the Mortgage Interest Rates on the Mortgage Loans, the rate of prepayment would
generally be expected to decrease. The rate of prepayment on the Mortgage Loans
may also be influenced by programs offered by mortgage loan originators
(including Norwest Mortgage), servicers (including Norwest Mortgage) and
mortgage loan brokers to encourage refinancing through such originators,
servicers and brokers, including, but not limited to, general or targeted
solicitations (which may be based on
 
                                      S-66
<PAGE>
characteristics including, but not limited to, the mortgage loan interest rate
or payment history and the geographic location of the Mortgaged Property),
reduced origination fees or closing costs, pre-approved applications, waiver of
pre-closing interest accrued with respect to a refinanced loan prior to the
pay-off of such loan, or other financial incentives. See "Prepayment and Yield
Considerations -- Weighted Average Life of Certificates" in the Prospectus. In
addition, Norwest Mortgage or third parties may enter into agreements with
borrowers providing for the bi-weekly payment of principal and interest on the
related mortgage loan, thereby accelerating payment of the mortgage loan
resulting in partial prepayments.
 
    Other factors affecting prepayment of mortgage loans include changes in
mortgagors' housing needs, job transfers, unemployment or, in the case of
self-employed mortgagors or mortgagors relying on commission income, substantial
fluctuations in income, significant declines in real estate values and adverse
economic conditions either generally or in particular geographic areas,
mortgagors' equity in the Mortgaged Properties, including the use of second or
"home equity" mortgage loans by mortgagors or the use of the properties as
second or vacation homes, and servicing decisions. In addition, all of the
Mortgage Loans contain due-on-sale clauses which will generally be exercised
upon the sale of the related Mortgaged Properties. Consequently, acceleration of
mortgage payments as a result of any such sale will affect the level of
prepayments on the Mortgage Loans. The extent to which defaulted Mortgage Loans
are assumed by transferees of the related Mortgaged Properties will also affect
the rate of principal payments. The rate of prepayment and, therefore, the yield
to maturity of the Offered Certificates will be affected by the extent to which
(i) the Seller elects to repurchase, rather than substitute for, Mortgage Loans
which are found by the Trustee to have defective documentation or with respect
to which the Seller has breached a representation or warranty or (ii) a Servicer
elects to encourage the refinancing of any defaulted Mortgage Loan rather than
to permit an assumption thereof by a mortgagor. See "Servicing of the Mortgage
Loans -- Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage
Loans" in the Prospectus. There can be no certainty as to the rate of
prepayments on the Mortgage Loans during any period or over the life of the
Series 1996-7 Certificates. See "Prepayment and Yield Considerations" in the
Prospectus.
 
    THE YIELD TO MATURITY OF THE OFFERED CERTIFICATES WILL BE SENSITIVE IN
VARYING DEGREES TO THE RATE AND TIMING OF PRINCIPAL PAYMENTS (INCLUDING
PREPAYMENTS, WHICH MAY BE MADE AT ANY TIME WITHOUT PENALTY) ON THE MORTGAGE
LOANS. INVESTORS IN THE OFFERED CERTIFICATES SHOULD CONSIDER THE ASSOCIATED
RISKS, INCLUDING, IN THE CASE OF OFFERED CERTIFICATES PURCHASED AT A DISCOUNT,
PARTICULARLY THE CLASS A-PO CERTIFICATES, THE RISK THAT A SLOWER THAN
ANTICIPATED RATE OF PAYMENTS IN RESPECT OF PRINCIPAL (INCLUDING PREPAYMENTS) ON
THE MORTGAGE LOANS COULD RESULT IN AN ACTUAL YIELD THAT IS LOWER THAN
ANTICIPATED AND, IN THE CASE OF OFFERED CERTIFICATES PURCHASED AT A PREMIUM, OR
IN THE CASE OF THE CLASS A-7 CERTIFICATE, WHICH HAS NO PRINCIPAL BALANCE, THAT
FASTER THAN ANTICIPATED RATE OF PAYMENTS IN RESPECT OF PRINCIPAL (INCLUDING
PREPAYMENTS) ON THE MORTGAGE LOANS OR, IN THE CASE OF THE CLASS A-PO
CERTIFICATES, THE DISCOUNT MORTGAGE LOANS, COULD RESULT IN AN ACTUAL YIELD THAT
IS LOWER THAN ANTICIPATED. INVESTORS PURCHASING OFFERED CERTIFICATES AT A
PREMIUM SHOULD ALSO CONSIDER THE RISK THAT A RAPID RATE OF PAYMENTS IN RESPECT
OF PRINCIPAL (INCLUDING PREPAYMENTS) ON THE MORTGAGE LOANS COULD RESULT IN THE
FAILURE OF SUCH INVESTORS TO FULLY RECOVER THEIR INITIAL INVESTMENTS. THE YIELD
ON THE CLASS A-PO CERTIFICATES WILL BE INFLUENCED PRIMARILY BY PRINCIPAL
PAYMENTS WITH RESPECT TO DISCOUNT MORTGAGE LOANS.
 
    The timing of changes in the rate of prepayment on the Mortgage Loans may
significantly affect the actual yield to maturity experienced by an investor who
purchases an Offered Certificate at a price other than par, even if the average
rate of principal payments experienced over time is consistent with such
investor's expectation. In general, the earlier a prepayment of principal on the
underlying Mortgage Loans, the greater the effect on such investor's yield to
maturity. As a result, the effect on such investor's yield 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 Offered Certificates
would not be fully offset by a subsequent like reduction (or increase) in the
rate of principal payments.
 
                                      S-67
<PAGE>
    The yield to maturity on the Class M Certificates will be more sensitive
than the yield to maturity on the Class A Certificates to losses due to defaults
on the Mortgage Loans (and the timing thereof), to the extent not covered by the
Class B Certificates, because the entire amount of such losses will be allocable
to the Class M Certificates prior to the Class A Certificates, except as
otherwise provided herein. To the extent not covered by Periodic Advances,
delinquencies on Mortgage Loans may also have a relatively greater effect on the
yield to investors in the Class M Certificates. Amounts otherwise distributable
to holders of the Class M Certificates will be made available to protect the
holders of the Class A Certificates against interruptions in distributions due
to certain mortgagor delinquencies. Such delinquencies, to the extent not
covered by the Class B Certificates, even if subsequently cured, may affect the
timing of the receipt of distributions by the holders of Class M Certificates,
because the entire amount of those delinquencies would be borne by the Class M
Certificates prior to the Class A Certificates.
 
    The yield to maturity on the Subclasses of Class B Certificates with higher
numerical designations will generally be more sensitive to losses than the
Subclasses with lower numerical designations, and the yield to maturity on the
Class B Certificates in the aggregate will generally be more sensitive to losses
than the other Classes of the Series 1996-7 Certificates, because the entire
amount of such losses (except for the portion of Excess Special Hazard Losses,
Excess Fraud Losses and Excess Bankruptcy Losses allocated to the Class A
Certificates, Class M Certificates and Subclasses of Class B Certificates with
lower numerical designations) will be allocable to the Subclasses of Class B
Certificates in reverse numerical order, except as provided herein. To the
extent not covered by Periodic Advances, delinquencies on Mortgage Loans will
also have a relatively greater effect (i) on the yield to maturity on the
Subclasses of Class B Certificates with higher numerical designations and (ii)
on the yield to maturity on the Class B Certificates in the aggregate than on
the Class A Certificates and Class M Certificates. Amounts otherwise
distributable to holders of the Class B Certificates will be made available to
protect the holders of the Class A and Class M Certificates against
interruptions in distributions due to certain mortgagor delinquencies. Such
delinquencies, even if subsequently cured, may affect the timing of the receipt
of distributions by the holders of the Class B Certificates.
 
    The actual yield to maturity experienced by an investor may also be affected
by the occurrence of interest shortfalls resulting from Unscheduled Principal
Receipts to the extent, if any, to which such interest shortfalls are not
covered by Compensating Interest or the subordination of, (i) in the case of the
Class A Certificates (other than the Class A-PO Certificates), the Class M and
Class B Certificates, (ii) in the case of the Class M Certificates, the Class B
Certificates and, (iii) in the case of a Subclass of Class B Certificates, the
Subclass or Subclasses of Class B Certificates having higher numerical
designations. See "Description of the Certificates -- Interest" and "Servicing
of the Mortgage Loans -- Anticipated Changes in Servicing."
 
    The yield to maturity on the Offered Certificates and more particularly on
the Class M Certificates and the Offered Class B Certificates, especially the
Class B-2 Certificates, may be affected by the geographic concentration of the
Mortgaged Properties securing the Mortgage Loans, and the yield to maturity on
the Class A-PO Certificates may be particularly affected by the geographic
concentration of the Mortgaged Properties securing the Discount Mortgage Loans.
In recent periods, California and several other regions in the United States
have experienced significant declines in housing prices. In addition, California
and several other regions have experienced natural disasters, including
earthquakes, floods and hurricanes, which may adversely affect property values.
Any deterioration in housing prices in California, as well as New Jersey, Texas,
New York and Florida and the other states in which the Mortgaged Properties are
located, and any deterioration of economic conditions in such states which
adversely affects the ability of borrowers to make payments on the Mortgage
Loans, may increase the likelihood of losses on the Mortgage Loans. Such losses,
if they occur, may have an adverse effect on the yield to maturity of the
Offered Certificates and more particularly on the Class M Certificates and the
Offered Class B Certificates, especially the Class B-2 Certificates.
 
    No representation is made as to the rate of principal payments on the
Mortgage Loans or as to the yield to maturity of any Subclass or Class of
Offered Certificates. An investor is urged to make an
 
                                      S-68
<PAGE>
investment decision with respect to any Subclass or Class of Offered
Certificates based on the anticipated yield to maturity of such Subclass or
Class of Offered Certificates resulting from its purchase price and such
investor's own determination as to anticipated Mortgage Loan prepayment rates
under a variety of scenarios. The extent to which any Subclass or Class of
Offered Certificates is purchased at a discount or a premium and the degree to
which such Subclass or Class is sensitive to the timing of prepayments will
determine the extent to which the yield to maturity of such Subclass or Class
may vary from the anticipated yield. An investor should carefully consider the
associated risks, including, in the case of any Subclass or Class of Offered
Certificates purchased at a discount, particularly the Class A-PO Certificates,
the risk that a slower than anticipated rate of principal payments on the
Mortgage Loans or, in the case of the Class A-PO Certificates, on the Discount
Mortgage Loans, could result in an actual yield to such investor that is lower
than the anticipated yield and, in the case of any Subclass or Class of Offered
Certificates purchased at a premium, or in the case of the Class A-7
Certificate, which has no principal balance, the risk that a faster than
anticipated rate of principal payments could result in an actual yield to such
investor that is lower than the anticipated yield.
 
    An investor should consider the risk that rapid rates of prepayments on the
Mortgage Loans, and therefore of amounts distributable in reduction of principal
balance of the Offered Certificates, may coincide with periods of low prevailing
interest rates. During such periods, the effective interest rates on securities
in which an investor may choose to reinvest amounts distributed in reduction of
the principal balance of such investor's Offered Certificate may be lower than
the applicable Pass-Through Rate or, in the case of the Class A-PO Certificates,
the anticipated yield thereon. Conversely, slower rates of prepayments on the
Mortgage Loans, and therefore of amounts distributable in reduction of principal
balance of the Offered Certificates, may coincide with periods of high
prevailing interest rates. During such periods, the amount of principal
distributions available to an investor for reinvestment at such high prevailing
interest rates may be relatively small.
 
    As indicated under "Federal Income Tax Considerations" herein, the Class A-R
and Class A-LR Certificateholders' REMIC taxable income and the tax liability
thereon may exceed, and may substantially exceed, cash distributions to such
holders during certain periods. There can be no assurance as to the amount by
which such taxable income or such tax liability will exceed cash distributions
in respect of the Class A-R and Class A-LR Certificates during any such period
and no representation is made with respect thereto under any principal
prepayment scenario or otherwise. DUE TO THE SPECIAL TAX TREATMENT OF RESIDUAL
INTERESTS, THE AFTER-TAX RETURN OF THE CLASS A-R AND CLASS A-LR CERTIFICATES MAY
BE SIGNIFICANTLY LOWER THAN WOULD BE THE CASE IF THE CLASS A-R AND CLASS A-LR
CERTIFICATES WERE TAXED AS DEBT INSTRUMENTS, OR MAY BE NEGATIVE.
 
    As referred to herein, the weighted average life of a Subclass or Class of
Offered Certificates (other than the Class A-7 Certificate) refers to the
average amount of time that will elapse from the date of issuance of such
Subclass or Class until each dollar in reduction of the principal balance of
such Subclass or Class is distributed to the investor. The weighted average life
of the Class A-7 Certificate is the average amount of time that will elapse
between the date of issuance of the Series 1996-7 Certificates and the date on
which each dollar in reduction of the reduction of the principal balance of the
Class A-2 Certificate (a portion of the principal balance of which corresponds
to the notional amount of the Class A-7 Certificate) is distributed to the
investors in the Class A-2 Certificates. The weighted average life of each
Subclass or Class of the Offered Certificates will be influenced by, among other
things, the rate and timing of principal payments on the Mortgage Loans, which
may be in the form of scheduled amortization, prepayments or other recoveries of
principal.
 
    Prepayments on mortgage loans are commonly measured relative to a prepayment
standard or model. The model used in this Prospectus Supplement, the Standard
Prepayment Assumption ("SPA"), represents an assumed rate of prepayment each
month relative to the then outstanding principal balance of a pool of new
mortgage loans. A prepayment assumption of 100% SPA assumes constant 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
 
                                      S-69
<PAGE>
in each month thereafter until the thirtieth month. Beginning in the thirtieth
month and in each month thereafter during the life of the mortgage loans, 100%
SPA assumes a constant prepayment rate of 6% per annum each month. As used in
the table below, "0% SPA" assumes prepayment rates equal to 0% of SPA, I.E., no
prepayments. Correspondingly, "175% SPA" assumes prepayment rates equal to 175%
of SPA. SPA DOES NOT PURPORT TO BE A HISTORICAL DESCRIPTION OF PREPAYMENT
EXPERIENCE OR A PREDICTION OF THE ANTICIPATED RATE OF PREPAYMENT OF ANY POOL OF
MORTGAGE LOANS, INCLUDING THE MORTGAGE LOANS.
 
    The tables set forth below have been prepared on the basis of the
characteristics of the Mortgage Loans that are expected to be included in the
Trust Estate, as described above under "Description of the Mortgage Loans." The
tables assume, among other things, the following (the "Structuring
Assumptions"): (i) the scheduled payment in each month for each Mortgage Loan
has been based on its outstanding balance as of the first day of the month
preceding the month of such payment, its Mortgage Interest Rate and its
remaining term to stated maturity, so that such scheduled payments would
amortize the remaining balance by its remaining term to maturity, (ii) scheduled
monthly payments of principal and interest on the Mortgage Loans will be timely
received on the first day of each month (with no defaults), commencing in
November 1996, (iii) the Seller does not repurchase any Mortgage Loan, as
described under "Description of the Mortgage Loans -- Mandatory Repurchase or
Substitution of Mortgage Loans" herein, and the Seller does not exercise its
option to purchase the Mortgage Loans and thereby cause a termination of the
Trust Estate, (iv) principal prepayments in full on the Mortgage Loans will be
received on the last day of each month commencing in October 1996 at the
respective percentages of SPA set forth in the tables and there are no partial
principal prepayments or Prepayment Interest Shortfalls, (v) the Series 1996-7
Certificates will be issued on October 29, 1996 and (vi) distributions to
Certificateholders will be made on the 25th day of each month, commencing in
November 1996.
 
    IT IS HIGHLY UNLIKELY THAT THE MORTGAGE LOANS WILL PREPAY AT ANY CONSTANT
RATE, THAT ALL OF THE MORTGAGE LOANS WILL PREPAY AT THE SAME RATE OR THAT THE
MORTGAGE LOANS WILL NOT EXPERIENCE ANY LOSSES. In addition, there may be
differences between the characteristics of the mortgage loans ultimately
included in the Trust Estate and the Mortgage Loans which are assumed to be
included, as described above. Any difference may have an effect upon the actual
percentages of initial Class A Subclass Principal Balance of the Subclasses of
Class A Certificates (or, in the case of the Class A-7 Certificate, the initial
Class A-7 Notional Amount), initial principal balance of the Class M
Certificates and initial Class B Subclass Principal Balance of the Subclasses of
Class B Certificates outstanding, the actual weighted average lives of the
Subclasses of Class A Certificates, the Class M Certificates and the Subclasses
of Class B Certificates and the date on which the Class A Subclass Principal
Balance of any Subclass of Class A Certificates (or, in the case of the Class
A-7 Certificate, the Class A-7 Notional Amount), the principal balance of the
Class M Certificates and the Class B Subclass Principal Balance of any Subclass
of Offered Class B Certificates are reduced to zero.
 
    Based upon the foregoing assumptions, the following tables indicate the
weighted average life of each Subclass and Class of Offered Certificates, and
set forth the percentages of the initial Class A Subclass Principal Balance of
each Subclass of Class A Certificates (or, in the case of the Class A-7
Certificate, the initial Class A-7 Notional Amount), the initial principal
balance of the Class M Certificates and the initial Class B Subclass Principal
Balance of each Subclass of Offered Class B Certificates that would be
outstanding after each of the dates shown at constant percentages of SPA
presented.
 
                                      S-70
<PAGE>
 PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE(1) OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                                                                    CLASS A-2
                                                                                                                  AND CLASS A-7
                                                            CLASS A-1                                          CERTIFICATES AT THE
                                                       CERTIFICATES AT THE                                    FOLLOWING PERCENTAGES
                                                    FOLLOWING PERCENTAGES OF                                            OF
                                                               SPA                                                     SPA
   DISTRIBUTION                            -------------------------------------------                        ----------------------
       DATE             0%         100%         175%         235%         400%         500%         600%         0%         100%
<S>                  <C>        <C>          <C>          <C>          <C>          <C>          <C>          <C>        <C>
- -------------------  ---------------------------------------------------------------------------------------  ----------------------
Initial............        100         100          100          100          100          100          100
                                                                                                                    100         100
October 1997.......         94          91           88           86           81           78           74
                                                                                                                     96          93
October 1998.......         88          77           70           64           48           39           30
                                                                                                                     91          84
October 1999.......         81          62           49           39           14            1            0
                                                                                                                     86          73
October 2000.......         73          47           30           18            0            0            0
                                                                                                                     81          63
October 2001.......         65          34           14            *            0            0            0
                                                                                                                     75          53
October 2002.......         56          21            *            0            0            0            0
                                                                                                                     69          44
October 2003.......         47          10            0            0            0            0            0
                                                                                                                     62          36
October 2004.......         37           0            0            0            0            0            0
                                                                                                                     55          28
October 2005.......         25           0            0            0            0            0            0
                                                                                                                     47          18
October 2006.......         13           0            0            0            0            0            0
                                                                                                                     38          10
October 2007.......          1           0            0            0            0            0            0
                                                                                                                     29           1
October 2008.......          0           0            0            0            0            0            0
                                                                                                                     16           0
October 2009.......          0           0            0            0            0            0            0
                                                                                                                      2           0
October 2010.......          0           0            0            0            0            0            0
                                                                                                                      0           0
October 2011.......          0           0            0            0            0            0            0
                                                                                                                      0           0
October 2012.......          0           0            0            0            0            0            0
                                                                                                                      0           0
October 2013.......          0           0            0            0            0            0            0
                                                                                                                      0           0
Weighted Average
  Life (years) (2)        6.33        3.96         3.05         2.61         1.94         1.72         1.55
                                                                                                                   8.00        5.55
 
<CAPTION>
 
                                                                                                  CLASS A-3
                                                                                             CERTIFICATES AT THE
                                                                                           FOLLOWING PERCENTAGES OF
                                                                                                     SPA
   DISTRIBUTION                                                                   ------------------------------------------
       DATE            175%       235%        400%         500%         600%         0%        100%       175%       235%
<S>                  <C>          <C>          <C>
- -------------------                                                               ------------------------------------------
Initial............
                           100        100         100          100          100
                                                                                        100        100        100        100
October 1997.......
                            92         90          86           84           82
                                                                                        100        100        100        100
October 1998.......
                            79         74          63           57           50
                                                                                        100        100        100        100
October 1999.......
                            64         57          39           29           18
                                                                                        100        100        100        100
October 2000.......
                            50         41          18            4            0
                                                                                        100        100        100        100
October 2001.......
                            39         29           *            0            0
                                                                                        100        100        100        100
October 2002.......
                            29         16           0            0            0
                                                                                        100        100        100        100
October 2003.......
                            18          6           0            0            0
                                                                                        100        100        100        100
October 2004.......
                             9          0           0            0            0
                                                                                        100        100        100         91
October 2005.......
                             1          0           0            0            0
                                                                                        100        100        100         68
October 2006.......
                             0          0           0            0            0
                                                                                        100        100         80         50
October 2007.......
                             0          0           0            0            0
                                                                                        100        100         59         35
October 2008.......
                             0          0           0            0            0
                                                                                        100         75         40         23
October 2009.......
                             0          0           0            0            0
                                                                                        100         47         24         13
October 2010.......
                             0          0           0            0            0
                                                                                         48         20         10          5
October 2011.......
                             0          0           0            0            0
                                                                                          0          0          0          0
October 2012.......
                             0          0           0            0            0
                                                                                          0          0          0          0
October 2013.......
                             0          0           0            0            0
                                                                                          0          0          0          0
Weighted Average
 
  Life (years) (2)
                          4.33       3.65        2.60         2.26         2.01
                                                                                      14.00      12.95      11.65      10.39
 
<CAPTION>
 
   DISTRIBUTION
       DATE             400%         500%         600%
- -------------------
Initial............
 
                            100          100          100
October 1997.......
 
                            100          100          100
October 1998.......
 
                            100          100          100
October 1999.......
 
                            100          100          100
October 2000.......
 
                            100          100           72
October 2001.......
 
                            100           54           17
October 2002.......
 
                             61           22            0
October 2003.......
 
                             35            5            0
October 2004.......
 
                             20            0            0
October 2005.......
 
                             12            0            0
October 2006.......
 
                              8            0            0
October 2007.......
 
                              5            0            0
October 2008.......
 
                              3            0            0
October 2009.......
 
                              1            0            0
October 2010.......
 
                              *            0            0
October 2011.......
 
                              0            0            0
October 2012.......
 
                              0            0            0
October 2013.......
 
                              0            0            0
Weighted Average
 
  Life (years) (2)
 
                           6.94         5.35         4.46
</TABLE>
<TABLE>
<CAPTION>
                                                                                                                   CLASS A-5
                                                            CLASS A-4                                         CERTIFICATES AT THE
                                                       CERTIFICATES AT THE                                         FOLLOWING
                                                    FOLLOWING PERCENTAGES OF                                     PERCENTAGES OF
                                                               SPA                                                    SPA
   DISTRIBUTION                           ---------------------------------------------                       --------------------
       DATE             0%         100%         175%         235%         400%         500%         600%         0%        100%
<S>                  <C>        <C>          <C>          <C>          <C>          <C>          <C>          <C>        <C>
- -------------------  ---------------------------------------------------------------------------------------  --------------------
Initial............        100         100          100          100          100          100          100
                                                                                                                    100        100
October 1997.......         96          96           96           96           96           96           96
                                                                                                                    100        100
October 1998.......         92          92           92           92           92           92           92
                                                                                                                    100        100
October 1999.......         88          88           88           88           88           88           88
                                                                                                                    100        100
October 2000.......         83          83           83           83           83           83           83
                                                                                                                    100        100
October 2001.......         78          78           78           78           78           78           78
                                                                                                                    100        100
October 2002.......         72          71           70           69           67           65           55
                                                                                                                    100        100
October 2003.......         66          64           61           60           55           52           28
                                                                                                                    100        100
October 2004.......         60          55           52           49           42           35           14
                                                                                                                    100        100
October 2005.......         53          46           42           38           30           21            7
                                                                                                                    100        100
October 2006.......         45          37           32           28           19           13            4
                                                                                                                    100        100
October 2007.......         37          29           24           20           12            7            2
                                                                                                                    100         19
October 2008.......         28          21           16           13            7            4            1
                                                                                                                    100          0
October 2009.......         19          13           10            7            4            2            *
                                                                                                                     24          0
October 2010.......          8           5            4            3            1            1            *
                                                                                                                      0          0
October 2011.......          0           0            0            0            0            0            0
                                                                                                                      0          0
October 2012.......          0           0            0            0            0            0            0
                                                                                                                      0          0
October 2013.......          0           0            0            0            0            0            0
                                                                                                                      0          0
Weighted Average
  Life (years) (2)        8.79        8.31         8.00         7.77         7.25         6.89         6.03
                                                                                                                  12.92      10.79
 
<CAPTION>
 
                                                                                                   CLASS A-6
                                                                                              CERTIFICATES AT THE
                                                                                           FOLLOWING PERCENTAGES OF
                                                                                                      SPA
   DISTRIBUTION                                                                       -----------------------------------
       DATE             175%         235%         400%         500%         600%         0%         100%         175%
<S>                  <C>          <C>          <C>          <C>
- -------------------                                                                   -----------------------------------
Initial............
                            100          100          100          100          100
                                                                                            100         100          100
October 1997.......
                            100          100          100          100          100
                                                                                             95          93           91
October 1998.......
                            100          100          100          100          100
                                                                                             90          82           77
October 1999.......
                            100          100          100          100          100
                                                                                             85          70           60
October 2000.......
                            100          100          100           63            0
                                                                                             79          59           46
October 2001.......
                            100          100            6            0            0
                                                                                             73          48           33
October 2002.......
                            100          100            0            0            0
                                                                                             66          39           22
October 2003.......
                            100           85            0            0            0
                                                                                             59          30           12
October 2004.......
                            100            0            0            0            0
                                                                                             51          21            2
October 2005.......
                             18            0            0            0            0
                                                                                             42          12            0
October 2006.......
                              0            0            0            0            0
                                                                                             32           3            0
October 2007.......
                              0            0            0            0            0
                                                                                             23           0            0
October 2008.......
                              0            0            0            0            0
                                                                                              9           0            0
October 2009.......
                              0            0            0            0            0
                                                                                              0           0            0
October 2010.......
                              0            0            0            0            0
                                                                                              0           0            0
October 2011.......
                              0            0            0            0            0
                                                                                              0           0            0
October 2012.......
                              0            0            0            0            0
                                                                                              0           0            0
October 2013.......
                              0            0            0            0            0
                                                                                              0           0            0
Weighted Average
 
  Life (years) (2)
                           8.75         7.30         4.84         4.08         3.54
                                                                                           7.56        5.10         3.95
 
<CAPTION>
 
   DISTRIBUTION
       DATE             235%         400%         500%         600%
- -------------------
Initial............
 
                            100          100          100          100
October 1997.......
 
                             89           85           82           80
October 1998.......
 
                             72           60           53           46
October 1999.......
 
                             52           33           22           11
October 2000.......
 
                             36           11            0            0
October 2001.......
 
                             22            0            0            0
October 2002.......
 
                              9            0            0            0
October 2003.......
 
                              0            0            0            0
October 2004.......
 
                              0            0            0            0
October 2005.......
 
                              0            0            0            0
October 2006.......
 
                              0            0            0            0
October 2007.......
 
                              0            0            0            0
October 2008.......
 
                              0            0            0            0
October 2009.......
 
                              0            0            0            0
October 2010.......
 
                              0            0            0            0
October 2011.......
 
                              0            0            0            0
October 2012.......
 
                              0            0            0            0
October 2013.......
 
                              0            0            0            0
Weighted Average
 
  Life (years) (2)
 
                           3.34         2.41         2.10         1.88
</TABLE>
 
- --------------------
 
(1) With respect to the Class A-7 Certificate, percentages are expressed as a
    percentage of the initial Class A-7 Notional Amount.
 
(2) The weighted average life of an Offered Certificate is determined by (i)
    multiplying the amount of net reduction of principal balance or notional
    amount, as the case may be, by the number of years from the date of the
    issuance of such Certificate to the related Distribution Date, (ii) adding
    the results and (iii) dividing the sum by the aggregate net reduction of
    principal balance or notional amount, as the case may be, referred to in
    clause (i).
 
 *  Indicates a percentage greater than zero but less than 0.5% of the initial
    principal balance of such Subclass or Class.
 
                                      S-71
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                                                                    CLASS A-PO
                                                    CLASS A-R AND CLASS A-LR                                   CERTIFICATES AT THE
                                                       CERTIFICATES AT THE                                    FOLLOWING PERCENTAGES
                                                    FOLLOWING PERCENTAGES OF                                            OF
                                                               SPA                                                     SPA
   DISTRIBUTION                           ---------------------------------------------                       ----------------------
       DATE             0%         100%         175%         235%         400%         500%         600%         0%         100%
<S>                  <C>        <C>          <C>          <C>          <C>          <C>          <C>          <C>        <C>
- -------------------  ---------------------------------------------------------------------------------------  ----------------------
Initial............        100         100          100          100          100          100          100
                                                                                                                    100         100
October 1997.......          0           0            0            0            0            0            0
                                                                                                                     96          94
October 1998.......          0           0            0            0            0            0            0
                                                                                                                     92          85
October 1999.......          0           0            0            0            0            0            0
                                                                                                                     87          76
October 2000.......          0           0            0            0            0            0            0
                                                                                                                     82          67
October 2001.......          0           0            0            0            0            0            0
                                                                                                                     76          59
October 2002.......          0           0            0            0            0            0            0
                                                                                                                     71          51
October 2003.......          0           0            0            0            0            0            0
                                                                                                                     64          44
October 2004.......          0           0            0            0            0            0            0
                                                                                                                     58          37
October 2005.......          0           0            0            0            0            0            0
                                                                                                                     51          31
October 2006.......          0           0            0            0            0            0            0
                                                                                                                     43          24
October 2007.......          0           0            0            0            0            0            0
                                                                                                                     35          19
October 2008.......          0           0            0            0            0            0            0
                                                                                                                     26          13
October 2009.......          0           0            0            0            0            0            0
                                                                                                                     16           8
October 2010.......          0           0            0            0            0            0            0
                                                                                                                      6           3
October 2011.......          0           0            0            0            0            0            0
                                                                                                                      0           0
October 2012.......          0           0            0            0            0            0            0
                                                                                                                      0           0
October 2013.......          0           0            0            0            0            0            0
                                                                                                                      0           0
Weighted Average
  Life (years) (1)        0.07        0.07         0.07         0.07         0.07         0.07         0.07
                                                                                                                   8.55        6.64
 
<CAPTION>
                                                                                                   CLASS M,
                                                                                            CLASS B-1 AND CLASS B-2
                                                                                              CERTIFICATES AT THE
                                                                                           FOLLOWING PERCENTAGES OF
                                                                                                      SPA
   DISTRIBUTION                                                                       -----------------------------------
       DATE             175%         235%         400%         500%         600%         0%         100%         175%
<S>                  <C>          <C>          <C>          <C>
- -------------------                                                                   -----------------------------------
Initial............
                            100          100          100          100          100
                                                                                            100         100          100
October 1997.......
                             92           91           87           85           83
                                                                                             96          96           96
October 1998.......
                             81           77           68           62           57
                                                                                             92          92           92
October 1999.......
                             69           63           49           41           35
                                                                                             88          88           88
October 2000.......
                             58           51           35           27           21
                                                                                             83          83           83
October 2001.......
                             48           41           25           18           13
                                                                                             78          78           78
October 2002.......
                             40           32           17           12            7
                                                                                             72          71           70
October 2003.......
                             33           25           12            7            4
                                                                                             66          64           61
October 2004.......
                             26           20            8            5            2
                                                                                             60          55           52
October 2005.......
                             21           15            5            3            1
                                                                                             53          46           42
October 2006.......
                             16           11            4            2            1
                                                                                             45          37           32
October 2007.......
                             11            7            2            1            *
                                                                                             37          29           24
October 2008.......
                              8            5            1            1            *
                                                                                             28          21           16
October 2009.......
                              4            3            1            *            *
                                                                                             19          13           10
October 2010.......
                              1            1            *            *            *
                                                                                              8           5            4
October 2011.......
                              0            0            0            0            0
                                                                                              0           0            0
October 2012.......
                              0            0            0            0            0
                                                                                              0           0            0
October 2013.......
                              0            0            0            0            0
                                                                                              0           0            0
Weighted Average
 
  Life (years) (1)
                           5.60         4.94         3.67         3.16         2.77
                                                                                           8.79        8.31         8.00
 
<CAPTION>
 
   DISTRIBUTION
       DATE             235%         400%         500%         600%
- -------------------
Initial............
 
                            100          100          100          100
October 1997.......
 
                             96           96           96           96
October 1998.......
 
                             92           92           92           92
October 1999.......
 
                             88           88           88           88
October 2000.......
 
                             83           83           83           83
October 2001.......
 
                             78           78           78           78
October 2002.......
 
                             69           67           65           63
October 2003.......
 
                             60           55           52           49
October 2004.......
 
                             49           42           38           34
October 2005.......
 
                             38           30           25           21
October 2006.......
 
                             28           19           15           11
October 2007.......
 
                             20           12            9            6
October 2008.......
 
                             13            7            5            3
October 2009.......
 
                              7            4            2            1
October 2010.......
 
                              3            1            1            *
October 2011.......
 
                              0            0            0            0
October 2012.......
 
                              0            0            0            0
October 2013.......
 
                              0            0            0            0
Weighted Average
 
  Life (years) (1)
 
                           7.77         7.25         7.00         6.77
</TABLE>
 
- --------------------
 
(1) The weighted average life of an Offered Certificate is determined by (i)
    multiplying the amount of net reduction of principal balance by the number
    of years from the date of the issuance of such Certificate to the related
    Distribution Date, (ii) adding the results and (iii) dividing the sum by the
    aggregate net reduction of principal balance referred to in clause (i).
 
 *  Indicates a percentage greater than zero but less than 0.5% of the initial
    principal balance of such Subclass or Class.
 
    Interest accrued on the Class A, Class M and Offered Class B Certificates
will be reduced by the amount of any interest portions of Realized Losses
allocated to such Certificates as described under "Description of the
Certificates -- Interest" herein. The yield on the Class A, Class M and Offered
Class B Certificates will be less than the yield otherwise produced by their
respective Pass-Through Rates and the prices at which such Certificates are
purchased because the interest which accrues on the Mortgage Loans during each
month will not be passed through to Certificateholders until the 25th day of the
month following the end of such month (or if such 25th day is not a business
day, the following business day).
 
    The Seller intends to file certain additional yield tables and other
computational materials with respect to one or more Subclasses or Class of
Offered Certificates with the Securities and Exchange Commission in a Report on
Form 8-K. See "Incorporation Of Certain Documents By Reference" in the
Prospectus. Such tables and materials will have been prepared by the Underwriter
at the request of certain prospective investors, based on assumptions provided
by, and satisfying the special requirements of, such investors. Such tables and
assumptions may be based on assumptions that differ from the Structuring
Assumptions. Accordingly, such tables and other materials may not be relevant to
or appropriate for investors other than those specifically requesting them.
 
SENSITIVITY OF THE CLASS A-7 CERTIFICATE
 
    THE YIELD TO AN INVESTOR IN THE CLASS A-7 CERTIFICATE WILL BE HIGHLY
SENSITIVE TO BOTH THE TIMING OF RECEIPT OF PREPAYMENTS AND THE OVERALL RATE OF
PRINCIPAL PREPAYMENT THE MORTGAGE LOANS, WHICH RATE MAY FLUCTUATE SIGNIFICANTLY
FROM TIME TO TIME. AN INVESTOR SHOULD FULLY CONSIDER THE ASSOCIATED RISKS,
INCLUDING THE RISK THAT A RAPID RATE OF PRINCIPAL PAYMENTS (INCLUDING
PREPAYMENTS) COULD RESULT IN THE FAILURE OF AN INVESTOR IN THE CLASS A-7
CERTIFICATE TO FULLY RECOVER ITS INITIAL INVESTMENT.
 
    The following table indicates the sensitivity to various rates of prepayment
on the Mortgage Loans of the pre-tax yields to maturity on a corporate bond
equivalent ("CBE") basis of the Class A-7
 
                                      S-72
<PAGE>
Certificate. Such calculations are based on distributions made in accordance
with "Description of the Certificates" above, on the Structuring Assumptions and
on the further assumptions that (i) the Class A-7 Certificate will be purchased
on October 29, 1996 at a purchase price equal to approximately $697,267 which
amount includes accrued interest from October 1, 1996 to (but not including)
October 29, 1996, (ii) the initial Class A Subclass Principal Balance of each
Subclass of Class A Certificates, other than the Class A-7 Certificate, will be
as set forth on the cover hereof and (iii) that there were no delinquencies on
the Mortgage Loans.
 
  SENSITIVITY OF THE PRE-TAX YIELD TO MATURITY ON THE CLASS A-7 CERTIFICATE TO
                                  PREPAYMENTS
 
<TABLE>
<CAPTION>
                                                                PERCENTAGES OF SPA
                                   -----------------------------------------------------------------------------
                                      0%        100%       175%       235%       400%        500%        600%
                                   ---------  ---------  ---------  ---------  ---------  ----------  ----------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>         <C>
Pre-Tax Yield (CBE)..............      35.09%     28.13%     22.08%     16.68%      0.84%      (8.50)%     (17.41)%
</TABLE>
 
    The pre-tax yields to maturity set forth in the preceding table were
calculated by (i) determining the monthly discount rates which, when applied to
the assumed stream of cash flows to be paid on the Class A-7 Certificate would
cause the discounted present value of such assumed stream of cash flows to equal
an assumed purchase price for the Class A-7 Certificate equal to approximately
$697,267 which amount includes accrued interest from October 1, 1996 to (but not
including) October 29, 1996 and (ii) converting such monthly rates to corporate
bond equivalent rates. Such calculation does not take into account the interest
rates at which an investor may be able to reinvest funds received by such
investor as distributions on the Class A-7 Certificate and consequently does not
purport to reflect the return on any investment in the Class A-7 Certificate
when such reinvestment rates are considered.
 
    NOTWITHSTANDING THE ASSUMED PREPAYMENT RATES REFLECTED IN THE PRECEDING
TABLE, IT IS HIGHLY UNLIKELY THAT THE MORTGAGE LOANS WILL PREPAY AT A CONSTANT
RATE UNTIL MATURITY, THAT ALL OF THE MORTGAGE LOANS WILL PREPAY AT THE SAME RATE
OR THAT THE MORTGAGE LOANS WILL NOT EXPERIENCE ANY LOSSES. The Mortgage Loans
initially included in the Trust Estate may differ from those currently expected
to be included in the Trust Estate, and thereafter may be changed as a result of
permitted substitutions. As a result of these factors, the pre-tax yields to
maturity on the Class A-7 Certificate are likely to differ from those shown in
such table, even if all of the Mortgage Loans prepay at the indicated
percentages of SPA.
 
SENSITIVITY OF THE CLASS A-PO CERTIFICATES
 
    THE YIELD TO AN INVESTOR IN THE CLASS A-PO CERTIFICATES WILL BE HIGHLY
SENSITIVE TO THE RATE AND TIMING OF PRINCIPAL PAYMENTS (INCLUDING PREPAYMENTS)
ON THE DISCOUNT MORTGAGE LOANS, WHICH RATE MAY FLUCTUATE SIGNIFICANTLY FROM TIME
TO TIME. AN INVESTOR SHOULD FULLY CONSIDER THE ASSOCIATED RISKS, INCLUDING THE
RISK THAT A RELATIVELY SLOW RATE OF PRINCIPAL PAYMENTS (INCLUDING PREPAYMENTS)
ON THE DISCOUNT MORTGAGE LOANS WILL HAVE A NEGATIVE EFFECT ON THE YIELD TO AN
INVESTOR IN THE CLASS A-PO CERTIFICATES. THE DISCOUNT MORTGAGE LOANS WILL HAVE
LOWER NET MORTGAGE INTEREST RATES THAN THE OTHER MORTGAGE LOANS. IN GENERAL,
MORTGAGE LOANS WITH LOWER MORTGAGE INTEREST RATES MAY TEND TO PREPAY AT A SLOWER
RATE OF PAYMENT IN RESPECT OF PRINCIPAL THAN MORTGAGE LOANS WITH RELATIVELY
HIGHER MORTGAGE INTEREST RATES, IN RESPONSE TO CHANGES IN MARKET INTEREST RATES.
AS A RESULT, THE DISCOUNT MORTGAGE LOANS MAY PREPAY AT A SLOWER RATE OF PAYMENT
IN RESPECT OF PRINCIPAL THAN THE OTHER MORTGAGE LOANS, RESULTING IN A LOWER
YIELD ON THE CLASS A-PO CERTIFICATES THAN WOULD BE THE CASE IF THE DISCOUNT
MORTGAGE LOANS PREPAID AT THE SAME RATE AS THE OTHER MORTGAGE LOANS.
 
    The following table indicates the sensitivity to the Prepayment Scenarios on
the Discount Mortgage Loans of the pre-tax yields to maturity on a CBE basis of
the Class A-PO Certificates. Such calculations are based on distributions made
in accordance with "Description of the Certificates" above, on the Structuring
Assumptions and on the further assumptions that (i) the Class A-PO Certificates
will be purchased on October 29, 1996 at an aggregate purchase price of 68.50%
of the
 
                                      S-73
<PAGE>
initial Class A Subclass Principal Balance of the Class A-PO Certificates and
(ii) distributions to holders of the Class A-PO Certificates will be made on the
25th day of each month commencing in November 1996.
 
 SENSITIVITY OF THE PRE-TAX YIELD TO MATURITY ON THE CLASS A-PO CERTIFICATES TO
                                  PREPAYMENTS
 
<TABLE>
<CAPTION>
                                                         PERCENTAGES OF SPA
                                --------------------------------------------------------------------
 
                                   0%       100%      175%      235%      400%      500%      600%
                                --------  --------  --------  --------  --------  --------  --------
<S>                             <C>       <C>       <C>       <C>       <C>       <C>       <C>
Pre-Tax Yield (CBE)...........     4.70 %    6.25 %    7.55 %    8.65 %   11.82 %   13.78 %   15.72 %
</TABLE>
 
    The pre-tax yields to maturity set forth in the preceding table were
calculated by (i) determining the monthly discount rates which, when applied to
the assumed stream of cash flows to be paid on the Class A-PO Certificates,
would cause the discounted present value of such assumed stream of cash flows to
equal an assumed aggregate purchase price for the Class A-PO Certificates of
68.50% of their initial Class A Subclass Principal Balance and (ii) converting
such monthly rates to corporate bond equivalent rates. Such calculation does not
take into account the interest rates at which investors may be able to reinvest
funds received by them as distributions on the Class A-PO Certificates and
consequently does not purport to reflect the return on any investment in the
Class A-PO Certificates when such reinvestment rates are considered.
 
    NOTWITHSTANDING THE ASSUMED PREPAYMENT RATES REFLECTED IN THE PRECEDING
TABLE, IT IS HIGHLY UNLIKELY THAT THE DISCOUNT MORTGAGE LOANS WILL PREPAY AT A
CONSTANT RATE UNTIL MATURITY, THAT ALL OF THE DISCOUNT MORTGAGE LOANS WILL
PREPAY AT THE SAME RATE OR THAT THE DISCOUNT MORTGAGE LOANS WILL NOT EXPERIENCE
ANY LOSSES. In addition, the Discount Mortgage Loans initially included in the
Trust Estate may differ from those currently expected to be included in the
Trust Estate and thereafter may be changed as a result of permitted
substitutions. As a result of these factors, the pre-tax yields to maturity on
the Class A-PO Certificates are likely to differ from those shown in such table,
even if all of the Discount Mortgage Loans prepay at the indicated percentages
of SPA.
 
HISTORIC LOSS EXPERIENCE OF SECURITIZED MORTGAGE LOANS
 
    The historic experience regarding the cumulative amount of losses and the
frequency of liquidations experienced on securitized(1) conventional mortgage
loans having original terms to stated maturity of approximately 15 years ("15
Year Mortgage Loans") have varied based on the year of origination as set forth
below.
 
<TABLE>
<CAPTION>
                                                                     LIQUIDATION        LOSS
                             YEAR OF                                  FREQUENCY       SEVERITY
                           ORIGINATION                              PERCENTAGE(A)   PERCENTAGES(B)
                          ------------                             ---------------  -------------
<S>                                                                <C>              <C>
1989.............................................................          5.11%          48.80%
1990.............................................................          1.44%          29.93%
1991.............................................................          0.63%          28.60%
1992.............................................................          0.24%          27.16%
1993.............................................................          0.08%          22.28%
1994.............................................................          0.00%           0.00%
1995.............................................................          0.00%           0.00%
</TABLE>
 
- ------------------------
(a)  The liquidation frequency percentage is determined by dividing the original
     principal balance of liquidated 15 Year Mortgage Loans originated during
     such year by the original principal balance of 15 Year Mortgage Loans
     originated during such year.
 
(b)  The loss severity percentage is determined by dividing the amount of losses
     resulting from liquidated 15 Year Mortgage Loans originated during such
     year by the original principal balance of liquidated 15 Year Mortgage Loans
     originated during such year.
 
(1) Mortgage loans included in a mortgage pool underlying a series of The
    Prudential Home Mortgage Securities Company, Inc.'s mortgage pass-through
    certificates (a "PHMSC Pool") or mortgage loans included in a mortgage pool
    underlying a series of NASCOR's mortgage pass-through certificates.
    Currently, the 15 Year Mortgage Loans are primarily serviced or subserviced
    by Norwest Mortgage, though prior to the PHMC Acquisition, PHMC was the
    primary servicer of those 15 Year Mortgage Loans included in the PHMSC
    Pools. Certain of the 15 Year Mortgage Loans are serviced by third-party
    servicers unaffiliated with either Norwest Mortgage or PHMC.
 
                                      S-74
<PAGE>
    The loss severity percentages for the more recent years of origination may
not be representative of the loss severity percentages in the future for the
indicated years of origination in part because the severity of loss on a
liquidated mortgage loan is generally expected to increase as the length of time
increases from the initial delinquency of such mortgage loan to the final
disposition of the mortgaged property. In addition, it is possible that because
the more recent loss severity percentages resulted from relatively low levels of
liquidations (which do not include those mortgage loans currently delinquent but
not yet liquidated) such percentages may not be representative of future loss
severity percentages arising from the liquidation of a larger number of mortgage
loans. The frequency of liquidations of the Mortgage Loans and the amount of
loss experienced as a result thereof may vary significantly from the historic
experience set forth above in part because the underwriting standards applied at
origination of the 15 Year Mortgage Loans have changed over time and may differ
from those applied at origination of the Mortgage Loans. Similarly, servicing
practices with respect to delinquent 15 Year Mortgage Loans have changed over
time. In addition, delinquencies, foreclosures and loan losses generally are
expected to occur with increasing frequency after the first full year of the
life of a mortgage loan. Many factors contribute to the severity of losses,
particularly the length of time from the initial delinquency of such mortgage
loan to the final disposition of the mortgaged property and the state in which
the mortgaged property is located. The Seller and Norwest Mortgage make no
representation that the actual losses and liquidation frequency experienced on
the Mortgage Loans currently serviced by Norwest Mortgage, on the Mortgage Loans
generally (which include Mortgage Loans serviced by Other Servicers) or on the
Mortgage Loans originated by Norwest Mortgage or a Norwest Mortgage
Correspondent will in any way correspond to the historic experience with respect
to the 15 Year Mortgage Loans.
 
YIELD CONSIDERATIONS WITH RESPECT TO THE CLASS B-1 AND CLASS B-2 CERTIFICATES
 
    Defaults on mortgage loans may be measured relative to a default standard or
model. The model used in this Prospectus Supplement, the standard default
assumption ("SDA"), represents an assumed rate of default each month relative to
the then-outstanding performing principal balance of a pool of new mortgage
loans. A default assumption of 100% SDA assumes constant default rates of 0.02%
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 0.02% per
annum in each month thereafter until the 30th month. Beginning in the 30th month
and in each month thereafter through the 60th month of the life of the mortgage
loans, 100% SDA assumes a constant default rate of 0.60% per annum each month.
Beginning in the 61st month and in each month thereafter through the 120th month
of the life of the mortgage loans, 100% SDA assumes that the constant default
rate declines each month by 0.0095% per annum, and that the constant default
rate remains at 0.03% per annum in each month after the 120th month. For the
purposes of the following tables, it is assumed that there is no delay between
the default and liquidation of the mortgage loans. As used in the following
tables, "0% SDA" assumes default rates equal to 0% of SDA (no defaults).
Correspondingly, "50% SDA" assumes default rates equal to 50% of SDA, and so
forth. SDA does not purport to be a historical description of default experience
or a prediction of the anticipated rate of default of any pool of mortgage
loans, including the Mortgage Loans.
 
    The following tables indicate the sensitivity of the pre-tax yield to
maturity on the Class B-1 and Class B-2 Certificates to various rates of
prepayment and varying levels of aggregate Realized Losses. The tables set forth
below are based upon, among other things, the Structuring Assumptions (other
than the assumption that no defaults shall have occurred with respect to the
Mortgage Loans) and the additional assumptions that liquidations (other than
those scenarios indicated as 0% of SDA (no defaults)) occur monthly on the last
day of the preceding month (other than on a Due Date) at the percentages of SDA
set forth in the table.
 
    In addition, it was assumed that (i) Realized Losses on liquidations of 25%
or 50% of the outstanding principal balance of such liquidated Mortgage Loans,
as indicated in the tables below (referred to as a "Loss Severity Percentage")
will occur at the time of liquidation, (ii) there are no Special Hazard Losses,
Fraud Losses or Bankruptcy Losses, (iii) the Class B-1 and Class B-2
Certificates are purchased
 
                                      S-75
<PAGE>
on October 29, 1996 at assumed purchase prices equal to 98.50% and 97.00%,
respectively, of the Class B Subclass Principal Balances thereof plus accrued
interest from October 1, 1996 to (but not including) October 29, 1996 and (iv)
that there were no delinquencies on the Mortgage Loans.
 
    It is unlikely that the Mortgage Loans will have the precise characteristics
referred to herein or that they will prepay or liquidate at any of the rates
specified. The assumed percentages of SDA and SPA shown in the tables below are
for illustrative purposes only and the Seller 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. Consequently,
there can be no assurance that the pre-tax yield to maturity of the Class B-1
and Class B-2 Certificates will correspond to any of the pre-tax yields to
maturity shown below.
 
    The pre-tax yields to maturity set forth in the following tables were
calculated by determining the monthly discount rates which, when applied to the
assumed streams of cash flows to be paid on the Class B-1 and Class B-2
Certificates, would cause the discounted present value of such assumed streams
of cash flows to equal the aggregate assumed purchase prices of the Class B-1
and Class B-2 Certificates set forth above. In all cases, monthly rates were
then converted to the semi-annual corporate bond equivalent yields shown below.
Implicit in the use of any discounted present value or internal rate of return
calculations such as these is the assumption that intermediate cash flows are
reinvested 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 distributions on the
Class B-1 and Class B-2 Certificates. Consequently, these yields do not purport
to reflect the total return on any investment in the Class B-1 and Class B-2
Certificates when such reinvestment rates are considered.
 
           SENSITIVITY OF PRE-TAX YIELDS TO MATURITY OF THE CLASS B-1
                CERTIFICATES TO PREPAYMENTS AND REALIZED LOSSES
 
<TABLE>
<CAPTION>
                                 LOSS                         PERCENTAGES OF SPA
PERCENTAGE                     SEVERITY    --------------------------------------------------------
OF SDA                        PERCENTAGE     0%       100%    175%    235%    400%    500%    600%
- ----------------------------  ----------   -------   ------   -----   -----   -----   -----   -----
<S>                           <C>          <C>       <C>      <C>     <C>     <C>     <C>     <C>
  0%........................     N/A         7.79%    7.80%   7.80%   7.80%   7.81%   7.82%   7.82%
 50%........................      25%        7.79%    7.80%   7.80%   7.81%   7.81%   7.82%   7.82%
 50%........................      50%        7.77%    7.81%   7.81%   7.81%   7.82%   7.82%   7.82%
 75%........................      25%        7.78%    7.80%   7.80%   7.81%   7.81%   7.82%   7.82%
 75%........................      50%        7.75%    7.80%   7.81%   7.81%   7.82%   7.82%   7.82%
100%........................      25%        7.77%    7.81%   7.81%   7.81%   7.82%   7.82%   7.82%
100%........................      50%        5.36%    7.53%   7.81%   7.82%   7.82%   7.82%   7.82%
200%........................      25%        5.59%    7.67%   7.81%   7.82%   7.82%   7.82%   7.82%
200%........................      50%      (38.21)%  (31.56)% (14.52)% (3.29)% 3.65%  6.92%   7.83%
</TABLE>
 
           SENSITIVITY OF PRE-TAX YIELDS TO MATURITY OF THE CLASS B-2
                CERTIFICATES TO PREPAYMENTS AND REALIZED LOSSES
 
<TABLE>
<CAPTION>
                                 LOSS                         PERCENTAGES OF SPA
PERCENTAGE                     SEVERITY    --------------------------------------------------------
OF SDA                        PERCENTAGE     0%       100%    175%    235%    400%    500%    600%
- ----------------------------  ----------   -------   ------   -----   -----   -----   -----   -----
<S>                           <C>          <C>       <C>      <C>     <C>     <C>     <C>     <C>
  0%........................     N/A         8.05%    8.07%   8.08%   8.09%   8.11%   8.12%   8.13%
 50%........................      25%        8.00%    8.08%   8.09%   8.09%   8.11%   8.12%   8.13%
 50%........................      50%        7.64%    8.02%   8.09%   8.10%   8.12%   8.12%   8.14%
 75%........................      25%        7.96%    8.08%   8.09%   8.10%   8.11%   8.12%   8.13%
 75%........................      50%       (2.86)%   3.79%   6.21%   7.82%   8.12%   8.13%   8.14%
100%........................      25%        7.72%    8.02%   8.09%   8.10%   8.12%   8.13%   8.14%
100%........................      50%      (31.30)%  (23.05)% (2.23)% 1.48%   7.50%   8.13%   8.14%
200%........................      25%      (30.79)%  (22.00)% (1.58)% 1.80%   7.69%   8.13%   8.14%
200%........................      50%      (70.32)%  (66.84)% (63.83)% (61.12)% (51.35)% (41.84)% (11.72)%
</TABLE>
 
                                      S-76
<PAGE>
    The following table sets forth the amount of Realized Losses that would be
incurred with respect to the Mortgage Loans, expressed as a percentage of the
aggregate outstanding principal balance of the Mortgage Loans as of the Cut-Off
Date.
 
                           AGGREGATE REALIZED LOSSES
 
<TABLE>
<CAPTION>
                                 LOSS                         PERCENTAGES OF SPA
PERCENTAGE                     SEVERITY    --------------------------------------------------------
OF SDA                        PERCENTAGE     0%       100%    175%    235%    400%    500%    600%
- ----------------------------  ----------   -------   ------   -----   -----   -----   -----   -----
<S>                           <C>          <C>       <C>      <C>     <C>     <C>     <C>     <C>
 50%........................      25%        0.39%    0.32%   0.28%   0.25%   0.19%   0.17%   0.14%
 50%........................      50%        0.77%    0.64%   0.56%   0.51%   0.39%   0.33%   0.29%
 75%........................      25%        0.58%    0.48%   0.42%   0.38%   0.29%   0.25%   0.22%
 75%........................      50%        1.15%    0.96%   0.84%   0.76%   0.58%   0.50%   0.43%
100%........................      25%        0.77%    0.64%   0.56%   0.51%   0.39%   0.33%   0.29%
100%........................      50%        1.53%    1.28%   1.12%   1.01%   0.77%   0.67%   0.58%
200%........................      25%        1.51%    1.26%   1.11%   1.00%   0.77%   0.66%   0.57%
200%........................      50%        3.02%    2.52%   2.21%   2.00%   1.53%   1.32%   1.14%
</TABLE>
 
    Notwithstanding the assumed percentages of SDA, Loss Severity Percentages
and prepayment rates reflected in the preceding tables, it is highly unlikely
that the Mortgage Loans will be prepaid or that the Realized Losses will be
incurred according to one particular pattern. For this reason, and because the
timing of cash flows is critical to determining yields, the pre-tax yields to
maturity on the Class B-1 and Class B-2 Certificates are likely to differ from
those shown in the tables. There can be no assurance that the Mortgage Loans
will prepay at any particular rate or that Realized Losses will be incurred at
any particular level or that the yields on the Class B-1 and Class B-2
Certificates will conform to any of the yields described herein.
 
    Investors are urged to make their investment decisions based on their
determinations as to anticipated rates of prepayment and Realized Losses under a
variety of scenarios. Investors in Class B-1 and Class B-2 Certificates should
fully consider the risk that Realized Losses on the Mortgage Loans could result
in the failure of such investors to fully recover their investments.
 
                                      S-77
<PAGE>
                        POOLING AND SERVICING AGREEMENT
 
GENERAL
 
    The Series 1996-7 Certificates will be issued pursuant to a Pooling and
Servicing Agreement to be dated as of the date of initial issuance of the Series
1996-7 Certificates (the "Pooling and Servicing Agreement") among the Seller,
the Master Servicer, the Trust Administrator and the Trustee. Reference is made
to the Prospectus for important additional information regarding the terms and
conditions of the Pooling and Servicing Agreement and the Series 1996-7
Certificates. See "Description of the Certificates," "Servicing of the Mortgage
Loans" and "The Pooling and Servicing Agreement" in the Prospectus.
 
    The Trust Estate created pursuant to the Pooling and Servicing Agreement
will consist of (i) the Mortgage Loans as described under "Description of the
Mortgage Loans," (ii) such assets as from time to time are identified as
deposited in any account held for the benefit of the Certificateholders, (iii)
any Mortgaged Properties acquired on behalf of the Certificateholders by
foreclosure or by deed in lieu of foreclosure after the date of original
issuance of the Certificates and (iv) the rights of the Trust Administrator to
receive the proceeds of all insurance policies and performance bonds, if any,
required to be maintained pursuant to the Pooling and Servicing Agreement.
 
DISTRIBUTIONS
 
    Distributions (other than the final distribution in retirement of the
Offered Certificates of each Class or Subclass) will be made by check mailed to
the address of the person entitled thereto as it appears on the Certificate
Register. However, with respect to the holder of the Class A-7 Certificate and
any holder of an Offered Certificate (other than the Class A-7 Certificate)
evidencing at least a $5,000,000 initial principal balance, distributions will
be made on the Distribution Date by wire transfer in immediately available
funds, provided that the Master Servicer, or the paying agent acting on behalf
of the Master Servicer, shall have been furnished with appropriate wiring
instructions not less than seven business days prior to the related Distribution
Date. The final distribution in respect of each Class or Subclass of Offered
Certificates will be made only upon presentation and surrender of the related
Certificate at the office or agency appointed by the Trust Administrator
specified in the notice of final distribution with respect to the related
Subclass or Class.
 
    Unless Definitive Certificates are issued as described above, the Master
Servicer and the Trust Administrator will treat DTC as the Holder of the
Book-Entry Certificates for all purposes, including making distributions thereon
and taking actions with respect thereto. DTC will make book-entry transfers
among its participants with respect to the Book-Entry Certificates; it will also
receive distributions on the Book-Entry Certificates from the Trust
Administrator and transmit them to participants for distribution to Beneficial
Owners or their nominees.
 
VOTING
 
    With respect to any provisions of the Pooling and Servicing Agreement
providing for the action, consent or approval of the holders of all Series
1996-7 Certificates evidencing specified Voting Interests in the Trust Estate,
the holders of the Class A Certificates will collectively be entitled to a
percentage (the "Class A Voting Interest") of the aggregate Voting Interest
represented by all Series 1996-7 Certificates equal to the sum of (A) the
product of (i) the then applicable Class A Percentage and (ii) the ratio
obtained by dividing the Pool Balance (Non-PO Portion) by the sum of the Pool
Balance (Non-PO Portion) and the Pool Balance (PO Portion) (the "Non-PO Voting
Interest") and (B) the Pool Balance (PO Portion) divided by the sum of the Pool
Balance (Non-PO Portion) and the Pool Balance (PO Portion); the holders of the
Class M Certificates will collectively be entitled to the then applicable
percentage of the aggregate Voting Interest represented by all Series 1996-7
Certificates equal to the product of (i) the ratio obtained by dividing the
Class M Principal Balance by the sum of the Class A Non-PO Principal Balance,
the Class M Principal Balance and the Class B Principal Balance and (ii) the
Non-PO Voting Interest; and the holders of the Class B Certificates will
collectively be entitled to the balance of the aggregate Voting Interest
represented by all Series 1996-7 Certificates (the "Class B Voting Interest").
The aggregate Voting Interest of each Subclass of Class A
 
                                      S-78
<PAGE>
Certificates (other than the Class A-7 and Class A-PO Certificates) on any date
will be equal to the product of (a) 99% of the portion the Class A Voting
Interest on such date represented by clause (A) above and (b) the fraction
obtained by dividing the Class A Subclass Principal Balance of such Subclass by
the Class A Non-PO Principal Balance on such date. The aggregate Voting Interest
of the Class A-7 Certificates on any date will be equal to 1% of the Class A
Voting Interest represented by clause (A) above. The aggregate Voting Interest
of the Class A-PO Certificates will be equal to the portion of the Class A
Voting Interest on such date represented by clause (B) above. The aggregate
Voting Interest of each Subclass of Class B Certificates on any date will be
equal to the product of (a) the Class B Voting Interest on such date and (b) the
fraction obtained by dividing the Class B Subclass Principal Balance of such
Subclass on such date by the Class B Principal Balance on such date. Each
Certificateholder of a Class or Subclass will have a Voting Interest equal to
the product of the Voting Interest to which such Class or Subclass is
collectively entitled and the Percentage Interest in such Class or Subclass
represented by such holder's Certificates. With respect to any provisions of the
Pooling and Servicing Agreement providing for action, consent or approval of
each Class or Subclass of Certificates or specified Classes or Subclasses of
Certificates, each Certificateholder of a Class or Subclass will have a Voting
Interest in such Class or Subclass equal to such holder's Percentage Interest in
such Class or Subclass. Unless Definitive Certificates are issued as described
above, Beneficial Owners of Book-Entry Certificates may exercise their voting
rights only through Participants.
 
TRUSTEE
 
    The Trustee for the Series 1996-7 Certificates will be Firstar Trust
Company, a banking corporation organized under the laws of the State of
Wisconsin. The Corporate Trust Office of the Trustee is located at 615 East
Michigan Street, Lewis Center, 4th Floor, Milwaukee, Wisconsin 53202. The
Trustee will be responsible for monitoring the compliance of the Master Servicer
with the Pooling and Servicing Agreement and the Underlying Servicing
Agreements. See "The Pooling and Servicing Agreement -- The Trustee" in the
Prospectus.
 
TRUST ADMINISTRATOR
 
    First Union National Bank of North Carolina, will act as Trust Administrator
for the Series 1996-7 Certificates. The corporate trust office of the Trust
Administrator is located at 230 South Tryon Street, Charlotte, North Carolina
28288. The Trust Administrator will perform certain administrative functions on
behalf of the Trustee and will act as the initial paying agent, certificate
registrar and custodian. In addition, the Trust Administrator will be required
to make Periodic Advances to the limited extent described herein with respect to
the Mortgage Loans serviced by Norwest Mortgage if Norwest Mortgage, as
Servicer, fails to make a Periodic Advance required by the related Underlying
Servicing Agreement. See "Description of the Certificates -- Periodic Advances"
herein.
 
MASTER SERVICER
 
    Norwest Bank will act as "Master Servicer" of the Mortgage Loans and, in
that capacity, will supervise the servicing of the Mortgage Loans, cause the
Mortgage Loans to be serviced in the event a Servicer is terminated and a
successor servicer is not appointed, provide certain reports to the Trust
Administrator regarding the Mortgage Loans and the Certificates and make
Periodic Advances to the limited extent described herein with respect to the
Mortgage Loans if a Servicer other than Norwest Mortgage fails to make a
Periodic Advance required by the related Underlying Servicing Agreement. The
Master Servicer will be entitled to a "Master Servicing Fee" payable monthly
equal to the product of (i) 1/12th of 0.02% (the "Master Servicing Fee Rate")
and (ii) the aggregate Scheduled Principal Balances of the Mortgage Loans as of
the first day of each month. The Master Servicer will pay all administrative
expenses to the Trust Estate subject to reimbursement as described under "Master
Servicer" in the Prospectus.
 
SPECIAL SERVICING AGREEMENTS
 
    The Pooling and Servicing Agreement may permit the Master Servicer to enter
into a special servicing agreement with an unaffiliated holder of a Subclass of
Class B Certificates or of a class of
 
                                      S-79
<PAGE>
securities representing interests in the Class B Certificates and/or other
subordinated mortgage pass-through certificates. Pursuant to such an agreement,
such holder may instruct the Master Servicer to instruct the Servicers, to the
extent provided in the applicable Underlying Servicing Agreement to commence or
delay foreclosure proceedings with respect to delinquent Mortgage Loans. Such
commencement or delay at such holder's direction will be taken by the Master
Servicer only after such holder deposits a specified amount of cash with the
Master Servicer. Such cash will be available for distribution to
Certificateholders if Liquidation Proceeds are less than they otherwise may have
been had the Servicers acted pursuant to their normal servicing procedures.
 
OPTIONAL TERMINATION
 
    At its option, the Seller may purchase from the Trust Estate all of the
Mortgage Loans, and thereby effect early retirement of the Series 1996-7
Certificates, on any Distribution Date when the Pool Scheduled Principal Balance
is less than 10% of the Cut-Off Date Aggregate Principal Balance. Any such
purchase will be made only in connection with a "qualified liquidation" of each
of the Upper-Tier REMIC and Lower-Tier REMIC within the meaning of Section
860F(a)(4)(A) of the Code. The purchase price will generally be equal to the
unpaid principal balance of each Mortgage Loan plus the fair market value of
other property (including any Mortgaged Property title to which has been
acquired by the Trust Estate ("REO Property")) in the Trust Estate plus accrued
interest. In the event the Trust Estate is liquidated as described above,
holders of the Certificates, to the extent funds are available, will receive the
unpaid principal balance of their Certificates and any accrued and unpaid
interest thereon. The amount, if any, remaining in the Certificate Account after
the payment of all principal and interest on the Certificates and expenses of
the Lower-Tier REMIC will be distributed to the holder of the Class A-LR
Certificate. See "Description of the Certificates -- Additional Rights of the
Class A-R and Class A-LR Certificateholders" herein and "The Pooling and
Servicing Agreement -- Termination; Purchase of Mortgage Loans" in the
Prospectus. The exercise of the foregoing option will be in the Seller's sole
discretion. Without limitation, the Seller may enter into agreements with third
parties to (i) exercise such option at the direction of such third party or (ii)
forbear from the exercise of such option.
 
                        SERVICING OF THE MORTGAGE LOANS
 
    Norwest Mortgage will service approximately 92.05% (by Cut-Off Date
Aggregate Principal Balance) of the Mortgage Loans and the other servicers
listed below (the "Other Servicers", and collectively with Norwest Mortgage, the
"Servicers") will service the balance of the Mortgage Loans, as indicated, each
pursuant to a separate Underlying Servicing Agreement. The rights to enforce the
related Servicer's obligations under each Underlying Servicing Agreement with
respect to the related Mortgage Loans will be assigned to the Trust
Administrator, on behalf of the Trustee, for the benefit of Certificateholders.
Among other things, the Servicers are obligated under certain circumstances to
advance delinquent payments of principal and interest with respect to the
Mortgage Loans. See "Servicing of the Mortgage Loans" in the Prospectus.
 
                                      S-80
<PAGE>
THE SERVICERS
 
    The Mortgage Loans initially will be serviced by the following entities:
 
<TABLE>
<CAPTION>
                                                                       APPROXIMATE PERCENTAGE OF CUT-OFF
                                                                       DATE AGGREGATE PRINCIPAL BALANCE
NAME OF SERVICER                                                                   SERVICED
- ---------------------------------------------------------------------  ---------------------------------
<S>                                                                    <C>
Norwest Mortgage, Inc. ..............................................                  92.05%
Suntrust Mortgage Inc. ..............................................                   2.41%
National City Mortgage Co. ..........................................                   1.62%
First Union Mortgage Corp. ..........................................                   1.28%
First Bank National Assoc. ..........................................                   1.17%
Countrywide Home Loans, Inc. ........................................                   0.77%
HomeSide Lending ....................................................                   0.48%
Cimarron Mortgage Corp. .............................................                   0.22%
                                                                                     -------
    Total............................................................                 100.00%
                                                                                     -------
                                                                                     -------
</TABLE>
 
    Certain information with respect to the loan servicing experience of Norwest
Mortgage is set forth under "Delinquency and Foreclosure Experience."
 
    The Mortgage Loans serviced by Norwest Mortgage are serviced either from
Norwest Mortgage's servicing center located in Frederick, Maryland (the "Norwest
Frederick-Serviced Loans") or from one of several other regional servicing
centers (the "Norwest Non-Frederick-Serviced Loans"). As of the Cut-Off Date, it
is expected that 235 of the Mortgage Loans in the Trust Estate, representing
approximately 44.79% of the Cut-Off Date Aggregate Principal Balance of the
Mortgage Loans will be Norwest Frederick-Serviced Loans and 211 of the Mortgage
Loans in the Trust Estate, representing approximately 47.26% of the Cut-Off Date
Aggregate Principal Balance of the Mortgage Loans will be Norwest
Non-Frederick-Serviced Loans.
 
SERVICER CUSTODIAL ACCOUNTS
 
    Each Servicer is required to establish and maintain a custodial account for
principal and interest (each such account, a "Servicer Custodial Account"), into
which it will deposit all collections of principal (including principal
prepayments and Liquidation Proceeds in respect of principal, if any) on any
Mortgage Loan that such Servicer services, interest (net of Servicing Fees) on
any Mortgage Loan that such Servicer services, related insurance proceeds,
advances made from the Servicer's own funds and the proceeds of any purchase of
a related Mortgage Loan for breach of a representation or warranty or the sale
of a Mortgaged Property in connection with liquidation of the related Mortgage
Loan. All Servicer Custodial Accounts are required to be held in a depository
institution and invested in the manner specified in the related Underlying
Servicing Agreement. Funds in such accounts generally must be held separate and
apart from the assets of the Servicer and generally may not be commingled with
funds held by a Servicer with respect to mortgage loans other than the Mortgage
Loans.
 
    Not later than the Remittance Date, the Servicers are obligated to remit to
the Certificate Account all amounts on deposit in the Servicer Custodial
Accounts as of the close of business on the business day preceding the
Remittance Date other than the following:
 
        (a) amounts received as late payments of principal or interest
    respecting which such Servicer previously has made one or more unreimbursed
    Periodic Advances;
 
        (b) any unreimbursed Periodic Advances of such Servicer with respect to
    Liquidated Loans;
 
        (c) those portions of each payment of interest on a particular Mortgage
    Loan which represent the applicable Servicing Fee, as adjusted where
    applicable in respect of Month End Interest as described under "Description
    of the Certificates -- Interest";
 
        (d) all amounts representing scheduled payments of principal and
    interest due after the Due Date occurring in the month in which such
    Distribution Date occurs;
 
                                      S-81
<PAGE>
        (e) unless the applicable Underlying Servicing Agreement provides for
    daily remittances of Unscheduled Principal Receipts, as described below
    under "-- Anticipated Changes in Servicing," all Unscheduled Principal
    Receipts received by such Servicer after the applicable Unscheduled
    Principal Receipt Period with respect thereto specified in the applicable
    Underlying Servicing Agreement, and all related payments of interest on such
    amounts;
 
        (f) all amounts representing certain expenses reimbursable to such
    Servicer and any other amounts permitted to be retained by such Servicer or
    withdrawn by such Servicer from the Servicer Custodial Account pursuant to
    the applicable Underlying Servicing Agreement;
 
        (g) all amounts in the nature of late fees, assumption fees, prepayment
    fees and similar fees which such Servicer is entitled to retain as
    additional servicing compensation; and t
 
        (h) reinvestment earnings on payments received in respect of the
    Mortgage Loans or on other amounts on deposit in the related Servicer
    Custodial Account.
 
UNSCHEDULED PRINCIPAL RECEIPTS
 
    The Pooling and Servicing Agreement specifies, as to each type of
Unscheduled Principal Receipt, a period (as to each type of Unscheduled
Principal Receipt, the "Unscheduled Principal Receipt Period") during which all
Unscheduled Principal Receipts of such type received by the Servicer will be
distributed to Certificateholders on the related Distribution Date. Each
Unscheduled Principal Receipt Period will either be (i) the one month period
ending on the last day of the calendar month preceding the month in which the
applicable Remittance Date occurs (such period a "Prior Month Receipt Period")
or (ii) the one month period ending on the day preceding the Determination Date
preceding the applicable Remittance Date (such period a "Mid-Month Receipt
Period").
 
    With respect to the Norwest Frederick-Serviced Loans, the Unscheduled
Principal Receipt Period with respect to all types of Unscheduled Principal
Receipts is a Mid-Month Receipt Period. With respect to the Norwest
Non-Frederick-Serviced Loans and Mortgage Loans serviced by Other Servicers, the
Unscheduled Principal Receipt Period with respect to all types of Unscheduled
Principal Receipts is a Prior Month Receipt Period.
 
ANTICIPATED CHANGES IN SERVICING
 
    CHANGES IN TIMING OF REMITTANCES OF UNSCHEDULED PRINCIPAL RECEIPTS IN FULL
AND ELIMINATION OF MONTH END INTEREST.  The Pooling and Servicing Agreement will
provide that the Master Servicer may (but is not required), from time to time
and without the consent of any Certificateholder, the Trustee or the Trust
Administrator, require Norwest Mortgage as Servicer under the related Underlying
Servicing Agreement to, or enter into an amendment to any applicable Underlying
Servicing Agreement to require any Other Servicer to, remit Unscheduled
Principal Receipts in full to the Master Servicer for deposit into the
Certificate Account daily on a specified business day following receipt thereof
which will generally result in a deposit earlier than on the following
Remittance Date. In conjunction with any such change, the applicable Servicer
would be relieved of its obligation to remit Month End Interest and certain
other conforming changes may be made. Such changes would have an effect on the
amount of Compensating Interest as described herein under the heading
"Description of the Certificates -- Interest." Further, the Pooling and
Servicing Agreement will provide that the Master Servicer may (but is not
required to), without the consent of any Certificateholder, the Trustee or the
Trust Administrator, require Norwest Mortgage or any successor thereto under the
applicable Underlying Servicing Agreement to make remittances to the Certificate
Account (other than any remittances which are required to be made daily) on the
18th day of each month, or if such 18th day is not a business day, on the
preceding business day. No assurance can be given as to the timing of any such
changes or that any such changes will occur.
 
    CHANGES IN UNSCHEDULED PRINCIPAL RECEIPT PERIOD.  The Pooling and Servicing
Agreement will provide that the Master Servicer may (but is not required to),
from time to time and without the consent of any Certificateholder, the Trustee
or the Trust Administrator, (i) direct Norwest Mortgage as Servicer under the
related Underlying Servicing Agreement to change the Unscheduled Principal
 
                                      S-82
<PAGE>
Receipt Period applicable to any type of Unscheduled Principal Receipt within
the parameters described in (i), (ii) and (iii) below or (ii) with respect to
any Other Servicer, enter into an amendment to any applicable Underlying
Servicing Agreement for the purpose of changing the Unscheduled Principal
Receipt Period applicable to any type of Unscheduled Principal Receipt within
the parameters described in (iv) below and making any necessary conforming
changes incident thereto. In connection therewith, (i) the Unscheduled Principal
Receipt Period for the Norwest Non-Frederick-Serviced Loans may be changed (to
achieve consistency with the Norwest Frederick-Serviced Loans) to a Mid-Month
Receipt Period with respect to all types of Unscheduled Principal Receipts; (ii)
the Unscheduled Principal Receipt Period for the Norwest Non-Frederick-Serviced
Loans may be changed to achieve an Unscheduled Principal Receipt Period regime
(the "Target Regime") under which the Unscheduled Principal Receipt Period with
respect to partial Unscheduled Principal Receipts would be a Prior Month Receipt
Period and the Unscheduled Principal Receipt Period with respect to Unscheduled
Principal Receipts in full would be a Mid-Month Receipt Period; (iii) the
Unscheduled Principal Receipt Period for the Norwest Frederick-Serviced Loans
may be changed to the Target Regime; and (iv) the Unscheduled Principal Receipt
Periods for the Mortgage Loans serviced by Other Servicers may be changed to the
Target Regime.
 
    Because Unscheduled Principal Receipts will result in interest shortfalls to
the extent that they are not distributed to Certificateholders in the month in
which they are received by the applicable Servicer, changing the applicable
Unscheduled Principal Receipt Period from a Mid-Month Receipt Period to a Prior
Month Receipt Period may have the effect of increasing the amount of interest
shortfalls with respect to the applicable type of Unscheduled Principal Receipt.
Conversely, changing the applicable Unscheduled Principal Receipt Period from a
Prior Month Receipt Period to a Mid-Month Receipt Period may decrease the amount
of interest shortfalls with respect to the applicable type of Unscheduled
Principal Receipt. See "Description of the Certificates -- Interest." No
assurance can be given as to the timing of any change to any Unscheduled
Principal Receipt Period or that any such changes will occur.
 
FIXED RETAINED YIELD; SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    A fixed percentage of the interest on each Mortgage Loan (the "Fixed
Retained Yield") with a per annum Mortgage Interest Rate greater than (i) the
sum of (a) 7.50%, (b) the Servicing Fee Rate and (c) the Master Servicing Fee
Rate, which will be determined on a loan by loan basis and will equal the
Mortgage Interest Rate on each Mortgage Loan minus the rate described in clause
(i), will not be included in the Trust Estate. There will be no Fixed Retained
Yield on any Mortgage Loan with a Mortgage Interest Rate equal to or less than
the rate described in clause (i). See "Servicing of the Mortgage Loans -- Fixed
Retained Yield, Servicing Compensation and Payment of Expenses" in the
Prospectus for further information regarding Fixed Retained Yield.
 
    The primary compensation payable to each of the Servicers is the aggregate
of the Servicing Fees applicable to the related Mortgage Loans. The Servicing
Fee applicable to each Mortgage Loan is expressed as a fixed percentage (the
"Servicing Fee Rate") of the scheduled principal balance (as defined in the
Underlying Servicing Agreements) of such Mortgage Loan as of the first day of
each month. The Servicing Fee Rate for each Mortgage Loan will be a fixed
percentage rate per annum. The Servicing Fee Rate for each Mortgage Loan is
0.25% per annum. In addition to the Servicing Fees, late payment fees, loan
assumption fees and prepayment fees with respect to the Mortgage Loans, and any
interest or other income earned on collections with respect to the Mortgage
Loans pending remittance to the Certificate Account, will be paid to, or
retained by, the Servicers as additional servicing compensation.
 
    The Master Servicer will pay all routine expenses, including fees of the
Trustee and Trust Administrator incurred in connection with its responsibilities
under the Pooling and Servicing Agreement, subject to certain rights of
reimbursement as described in the Prospectus. The servicing fees and other
expenses of the Trust Estate will be allocated to the holders of the Class A-R
and Class A-LR Certificates, respectively, who are individuals, estates or
trusts (whether such Certificate is held directly or through certain
pass-through entities) as additional gross income without a corresponding
 
                                      S-83
<PAGE>
distribution of cash, and any such investor (or its owners, in the case of a
pass-through entity) may be limited in its ability to deduct such expenses for
regular tax purposes and may not be able to deduct such expenses to any extent
for alternative minimum tax purposes. Unless and until applicable authority
provides otherwise, the Seller intends to treat all such expenses as incurred by
the Lower-Tier REMIC and, therefore, as allocable to the holder of the Class
A-LR Certificate. See "Certain Federal Income Tax Consequences -- Federal Income
Tax Consequences for REMIC Certificates --  Limitations on Deduction of Certain
Expenses" in the Prospectus.
 
SERVICER DEFAULTS
 
    The Trustee will have the right pursuant to the Underlying Servicing
Agreements to terminate a Servicer in certain events, including the breach by
such Servicer of any of its material obligations under its Underlying Servicing
Agreement. In the event of such termination, (i) the Trustee may enter into a
substitute Underlying Servicing Agreement with the Master Servicer or, at the
Master Servicer's nomination, another servicing institution acceptable to the
Trustee and each Rating Agency; and (ii) the Master Servicer shall assume
certain of the Servicer's servicing obligations under such Underlying Servicing
Agreement, including the obligation to make Periodic Advances (limited as
provided herein under the heading "Pooling and Servicing Agreement -- Periodic
Advances"), until such time as a successor servicer is appointed. Any successor
Servicer, including the Master Servicer or the Trustee, will be entitled to
compensation arrangements similar to those provided to the Servicer. See
"Servicing of the Mortgage Loans -- Fixed Retained Yield, Servicing Compensation
and Payment of Expenses" in the Prospectus.
 
                       FEDERAL INCOME TAX CONSIDERATIONS
 
    The following discussion represents the opinion of Cadwalader, Wickersham &
Taft as to the anticipated material federal income tax consequences of the
purchase, ownership and disposition of the Offered Certificates.
 
    The Trust Estate will consist of two segregated asset groupings, each of
which will qualify as a REMIC for federal income tax purposes. One REMIC (the
"Lower-Tier REMIC") will issue certain uncertificated interests (each, a
"Lower-Tier REMIC Regular Interest"), each of which will be designated as a
regular interest in the Lower-Tier REMIC, and the Class A-LR Certificate, which
will be designated as the residual interest in the Lower-Tier REMIC. The assets
of the Lower-Tier REMIC will include the Mortgage Loans, together with the
amounts held by the Master Servicer in a separate account in which collections
on the Mortgage Loans will be deposited (the "Certificate Account"), the hazard
insurance policies and primary mortgage insurance policies, if any, relating to
the Mortgage Loans and any property that secured a Mortgage Loan that is
acquired by foreclosure or deed in lieu of foreclosure.
 
    The second REMIC (the "Upper-Tier REMIC") will issue all Subclasses of the
Class A Certificates (other than the Class A-LR Certificate), the Class M
Certificates and all Subclasses of the Class B Certificates. The Class A-1,
Class A-2, Class A-3, Class A-4, Class A-5, Class A-6, Class A-7 and Class A-PO
Certificates, the Class M Certificates and the Class B-1 and Class B-2
Certificates (collectively, the "Regular Certificates"), together with the Class
B-3, Class B-4, and Class B-5 Certificates, will be designated as regular
interests in the Upper-Tier REMIC, and the Class A-R Certificate will be
designated as the residual interest in the Upper-Tier REMIC. The regular
interests and the residual interest in the Upper-Tier REMIC are referred to
herein collectively as the "Upper-Tier Certificates." The Class A-R and Class
A-LR Certificates are "Residual Certificates" for purposes of the Prospectus.
The assets of the Upper-Tier REMIC will include the uncertificated Lower-Tier
REMIC Regular Interests and a separate account in which distributions on the
uncertificated Lower-Tier REMIC Regular Interests will be deposited. The
aggregate amount distributed to the holders of the Upper-Tier Certificates,
payable from such separate account, will be equal to the aggregate distributions
in respect of the Mortgage Loans on the uncertificated Lower-Tier REMIC Regular
Interests.
 
                                      S-84
<PAGE>
    The Offered Certificates will be treated as "loans ... secured by an
interest in real property which is ... residential real property" for domestic
building and loan associations, and "real estate assets" for real estate
investment trusts, to the extent described in the Prospectus.
 
REGULAR CERTIFICATES
 
    The Regular Certificates generally will be treated as newly originated debt
instruments for federal income tax purposes. Beneficial Owners (or in the case
of Definitive Certificates, holders) of the Regular Certificates will be
required to report income on such Certificates in accordance with the accrual
method of accounting.
 
    The Class A-PO Certificates will be issued with original issue discount in
an amount equal to the excess of the initial principal balances thereof over
their respective issue prices. It is anticipated that the Class B-2 Certificates
will be issued with original issue discount in an amount equal to the excess of
their initial principal balance (plus four days of interest at the Pass-Through
Rate thereon) over their issue price (including accrued interest). It is also
anticipated that the Class A-1, Class A-2, Class A-3, Class A-4, Class A-5,
Class A-6 and Class M Certificates will be issued at a premium and that the
Class B-1 Certificates will be issued with DE MINIMIS original issue discount
for federal income tax purposes. It is further anticipated that the Class B-3,
Class B-4 and Class B-5 Certificates, which are not offered hereby, will be
issued with original issue discount for federal income tax purposes.
 
    Although unclear for federal income tax purposes, it is anticipated that the
Class A-7 Certificate will be considered to be issued with original issue
discount in an amount equal to the excess of all distributions of interest
expected to be received thereon over its issue price (including accrued
interest). Any "negative" amounts of original issue discount on the Class A-7
Certificate attributable to rapid prepayments with respect to the Mortgage Loans
will not be deductible currently, but may be offset against future positive
accruals of original issue discount, if any. Finally, a holder of the Class A-7
Certificate may be entitled to a loss deduction to the extent it becomes certain
that such holder will not recover a portion of its basis in such Certificate,
assuming no further prepayments. In the alternative, it is possible that rules
similar to the "noncontingent bond method"of the contingent interest rules in
the OID Regulations, as amended on June 12, 1996, may be promulgated with
respect to the Class A-7 Certificate. See "Certain Federal Income Taxes --
Federal Income Tax -- Federal Income Tax Consequence For REMIC Certificates --
Taxation of Regular Certificates -- Original Issue Discount" in the Prospectus.
Under the noncontingent bond method, if the interest payable for any period is
greater or less than the amount projected, the amount of income included for
that period would be either increased or decreased accordingly. Any net
reduction in the income accrual for the taxable year below zero (a "Negative
Adjustment") would be treated by a Certificateholder as ordinary loss to the
extent of prior income accruals and would be carried forward to offset future
interest accruals. At maturity, any remaining Negative Adjustment would be
treated as a loss on retirement of the Certificate. The legislative history of
relevant Code provisions indicates, however, that negative amounts of original
issue discount on an instrument such as a REMIC regular interest may not give
rise to taxable losses in any accrual period prior to the instrument's
disposition or retirement. Thus, it is not clear whether any losses resulting
from a Negative Adjustment would be recognized currently or be carried forward
until disposition or retirement of the debt obligation.
 
    The Prepayment Assumption (as defined in the Prospectus) that the Master
Servicer intends to use in determining the rate of accrual of original issue
discount and whether the original issue discount is considered DE MINIMIS will
be calculated using 235% of SPA. No representation is made as to the actual rate
at which the Mortgage Loans will prepay.
 
RESIDUAL CERTIFICATES
 
    The holders of the Class A-R and Class A-LR Certificates must include the
taxable income or loss of the Upper-Tier REMIC and Lower-Tier REMIC,
respectively, in determining their federal taxable income. The Class A-R and
Class A-LR Certificates will remain outstanding for federal income tax purposes
until there are no Certificates of any other Class outstanding. PROSPECTIVE
INVESTORS ARE CAUTIONED THAT THE CLASS A-R AND CLASS A-LR CERTIFICATEHOLDERS'
REMIC TAXABLE INCOME AND THE TAX
 
                                      S-85
<PAGE>
LIABILITY THEREON MAY EXCEED, AND MAY SUBSTANTIALLY EXCEED, CASH DISTRIBUTIONS
TO SUCH HOLDERS DURING CERTAIN PERIODS, IN WHICH EVENT, THE HOLDER THEREOF MUST
HAVE SUFFICIENT ALTERNATIVE SOURCES OF FUNDS TO PAY SUCH TAX LIABILITY.
Furthermore, it is anticipated that all or a substantial portion of the taxable
income of the Upper-Tier REMIC and Lower-Tier REMIC includible by the holders of
the Class A-R and Class A-LR Certificates, respectively, will be treated as
"excess inclusion" income, resulting in (i) the inability of such holders to use
net operating losses to offset such income from the respective REMIC, (ii) the
treatment of such income as "unrelated business taxable income" to certain
holders who are otherwise tax-exempt, and (iii) the treatment of such income as
subject to 30% withholding tax to certain non-U.S. investors, with no exemption
or treaty reduction.
 
    The Class A-R and Class A-LR Certificates will be considered "noneconomic
residual interests," with the result that transfers thereof would be disregarded
for federal income tax purposes if any significant purpose of the transferor was
to impede the assessment or collection of tax. Accordingly, the transferee
affidavit used for transfer of the Class A-R and Class A-LR Certificates will
require the transferee to affirm that it (i) historically has paid its debts as
they have come due and intends to do so in the future, (ii) understands that it
may incur tax liabilities with respect to the Class A-R or Class A-LR
Certificate in excess of cash flows generated thereby, (iii) intends to pay
taxes associated with holding the Class A-R or Class A-LR Certificate as such
taxes become due and (iv) will not transfer the Class A-R or Class A-LR
Certificate to any person or entity that does not provide a similar affidavit.
The transferor must certify in writing to the Trust Administrator that, as of
the date of the transfer, it had no knowledge or reason to know that the
affirmations made by the transferee pursuant to the preceding sentence were
false. Additionally, the Class A-R and Class A-LR Certificates generally may not
be transferred to certain persons who are not U.S. Persons (as defined herein).
See "Description of the Certificates -- Restrictions on Transfer of the Class
A-R, Class A-LR, Class M and Offered Class B Certificates" herein and "Certain
Federal Income Tax Consequences -- Federal Income Tax Consequences For REMIC
Certificates," "-- Taxation of Residual Certificates -- Limitations on Offset or
Exemption of REMIC Income" and "-- Tax-Related Restrictions on Transfer of
Residual Certificates -- Noneconomic Residual Interests" in the Prospectus.
 
    An individual, trust or estate that holds the Class A-R or Class A-LR
Certificate (whether such Certificate is held directly or indirectly through
certain pass-through entities) also may have additional gross income with
respect to, but may be subject to limitations on the deductibility of, Servicing
Fees on the Mortgage Loans and other administrative expenses properly allocable
to the applicable REMIC in computing such holder's regular tax liability, and
may not be able to deduct such fees or expenses to any extent in computing such
holder's alternative minimum tax liability. In addition, some portion of a
purchaser's basis, if any, in the Class A-R or Class A-LR Certificate may not be
recovered until termination of the respective REMIC. Furthermore, the federal
income tax consequences of any consideration paid to a transferee on a transfer
of the Class A-R or Class A-LR Certificate are unclear. The preamble to the
REMIC Regulations indicates that the Internal Revenue Service anticipates
providing guidance with respect to the federal tax treatment of such
consideration. Any transferee receiving consideration with respect to the Class
A-R and Class A-LR Certificates should consult its tax advisors.
 
    DUE TO THE SPECIAL TAX TREATMENT OF RESIDUAL INTERESTS, THE EFFECTIVE
AFTER-TAX RETURN OF THE CLASS A-R AND CLASS A-LR CERTIFICATES MAY BE
SIGNIFICANTLY LOWER THAN WOULD BE THE CASE IF THE CLASS A-R AND CLASS A-LR
CERTIFICATES WERE TAXED AS DEBT INSTRUMENTS, OR MAY BE NEGATIVE.
 
    See "Certain Federal Income Tax Consequences" in the Prospectus.
 
                              ERISA CONSIDERATIONS
 
    Neither the Class A-R nor Class A-LR Certificate may be purchased by or
transferred to any person which is an employee benefit plan within the meaning
of Section 3(3) of the Employee Retirement Income Security Act of 1974, as
amended ("ERISA"), and which is subject to the fiduciary responsibility rules of
Sections 401-414 of ERISA or Code Section 4975 (an "ERISA Plan") or which is
 
                                      S-86
<PAGE>
a governmental plan, as defined in Section 3(32) of ERISA, subject to any
federal, state or local law ("Similar Law") which is, to a material extent,
similar to the foregoing provisions of ERISA or the Code (collectively, with an
ERISA Plan, a "Plan"), or any person utilizing the assets of such Plan.
Accordingly, the following discussion does not purport to discuss the
considerations under ERISA, Code Section 4975 or Similar Law with respect to the
purchase, acquisition or resale of the Class A-R or Class A-LR Certificate and
for purposes of the following discussion all references to the Offered
Certificates are deemed to exclude the Class A-R and Class A-LR Certificates.
 
    In addition, under current law the purchase and holding of the Class M or
Offered Class B Certificates by or on behalf of a Plan may result in "prohibited
transactions" within the meaning of ERISA and Code Section 4975 or Similar Law.
Transfer of the Class M or Offered Class B Certificates will not be made unless
the transferee (i) executes a representation letter in form and substance
satisfactory to the Trustee stating that (a) it is not, and is not acting on
behalf of, any such Plan or using the assets of any such Plan to effect such
purchase or (b) if it is an insurance company, that the source of funds used to
purchase the Class M or Offered Class B Certificates is an "insurance company
general account" (as such term is defined in Section V(e) of Prohibited
Transaction Class Exemption 95-60 ("PTE 95-60"), 60 Fed. Reg. 35925 (July 12,
1995)) and there is no Plan with respect to which the amount of such general
account's reserves and liabilities for the contract(s) held by or on behalf of
such Plan and all other Plans maintained by the same employer (or affiliate
thereof as defined in Section V(a)(1) of PTE 95-60) or by the same employee
organization exceeds 10% of the total of all reserves and liabilities of such
general account (as such amounts are determined under Section I(a) of PTE 95-60)
at the date of acquisition or (ii) provides an opinion of counsel in form and
substance satisfactory to the Trustee that the purchase or holding of the Class
M or Offered Class B Certificates by or on behalf of such Plan will not result
in the assets of the Trust Estate being deemed to be "plan assets" and subject
to the prohibited transaction provisions of ERISA and the Code or Similar Law
and will not subject the Seller, the Master Servicer or the Trustee to any
obligation in addition to those undertaken in the Pooling and Servicing
Agreement. The Class M and Offered Class B Certificates will contain a legend
describing such restrictions on transfer and the Pooling and Servicing Agreement
will provide that any attempted or purported transfer in violation of these
transfer restrictions will be null and void and will vest no rights in any
purported transferee. Accordingly, the following discussion does not purport to
discuss the considerations under ERISA, Code Section 4975 or Similar Law with
respect to the purchase, acquisition or resale of the Class M or Offered Class B
Certificates and for purposes of the following discussion all references to the
Offered Certificates are deemed to exclude the Class M and Offered Class B
Certificates.
 
    As described in the Prospectus under "ERISA Considerations," ERISA and the
Code impose certain duties and restrictions on ERISA Plans and certain persons
who perform services for ERISA Plans. Comparable duties and restrictions may
exist under Similar Law on governmental plans and certain persons who perform
services for governmental plans. For example, unless exempted, investment by an
ERISA Plan in the Offered Certificates may constitute a prohibited transaction
under ERISA, the Code or Similar Law. There are certain exemptions issued by the
United States Department of Labor (the "DOL") that may be applicable to an
investment by an ERISA Plan in the Offered Certificates, including the
individual administrative exemption described below and Prohibited Transaction
Class Exemption 83-1 ("PTE 83-1"). For a further discussion of the individual
administrative exemption and PTE 83-1, including the necessary conditions to
their applicability, and other important factors to be considered by an ERISA
Plan contemplating investing in the Offered Certificates, see "ERISA
Considerations" in the Prospectus.
 
    On December 5, 1990, the DOL issued to the Underwriter an individual
administrative exemption, Prohibited Transaction Exemption 90-83, 55 Fed. Reg.
50250 (the "Exemption"), from certain of the prohibited transaction rules of
ERISA with respect to the initial purchase, the holding and the subsequent
resale by an ERISA Plan of certificates in pass-through trusts that meet the
conditions and requirements of the Exemption. The Exemption might apply to the
acquisition, holding and resale of the Offered Certificates by an ERISA Plan,
provided that specified conditions are met.
 
                                      S-87
<PAGE>
    Among the conditions which would have to be satisfied for the Exemption to
apply to the acquisition by an ERISA Plan of the Offered Certificates is the
condition that the ERISA Plan investing in the Offered Certificates be an
"accredited investor" as defined in Rule 501(a)(1) of Regulation D of the
Securities and Exchange Commission under the Securities Act of 1933, as amended
(the "Securities Act").
 
    Before purchasing an Offered Certificate, a fiduciary of an ERISA Plan
should make its own determination as to the availability of the exemptive relief
provided in the Exemption or the availability of any other prohibited
transaction exemptions (including PTE 83-1), and whether the conditions of any
such exemption will be applicable to the Offered Certificates and a fiduciary of
a governmental plan should make its own determination as to the need for and
availability of any exemptive relief under Similar Law. Any fiduciary of an
ERISA Plan considering whether to purchase an Offered Certificate should also
carefully review with its own legal advisors the applicability of the fiduciary
duty and prohibited transaction provisions of ERISA, the Code and Similar Law to
such investment. See "ERISA Considerations" in the Prospectus.
 
                                LEGAL INVESTMENT
 
    The Class A and Class M Certificates constitute "mortgage related
securities" for purposes of the Secondary Mortgage Market Enhancement Act of
1984 (the "Enhancement Act") so long as they are rated in one of the two highest
rating categories by at least one nationally recognized statistical rating
organization. As such, the Class A and Class M Certificates are legal
investments for certain entities to the extent provided in the Enhancement Act.
However, institutions subject to the jurisdiction of the Office of the
Comptroller of the Currency, the Board of Governors of the Federal Reserve
System, the Federal Deposit Insurance Corporation, the Office of Thrift
Supervision, the National Credit Union Administration or state banking or
insurance authorities should review applicable rules, supervisory policies and
guidelines of these agencies before purchasing any of the Class A and Class M
Certificates, as certain Subclasses of the Class A Certificates or the Class M
Certificates may be deemed to be unsuitable investments under one or more of
these rules, policies and guidelines and whether certain restrictions may apply
to investments in other Subclasses of the Class A Certificates or the Class M
Certificates. It should also be noted that certain states recently have enacted,
or have proposed enacting, legislation limiting to varying extents the ability
of certain entities (in particular insurance companies) to invest in mortgage
related securities. Investors should consult with their own legal advisors in
determining whether and to what extent Class A and Class M Certificates
constitute legal investments for such investors. See "Legal Investment" in the
Prospectus.
 
    The Class B-1 and Class B-2 Certificates will not constitute "mortgage
related securities" under the Enhancement Act. The appropriate characterization
of the Class B-1 and Class B-2 Certificates under various legal investment
restrictions, and thus the ability of investors subject to these restrictions to
purchase the Class B-1 and Class B-2 Certificates, may be subject to significant
interpretative uncertainties. All investors whose investment authority is
subject to legal restrictions should consult their own legal advisors to
determine whether, and to what extent, the Class B-1 and Class B-2 Certificates
will constitute legal investments for them. See "Legal Investment" in the
Prospectus.
 
                                SECONDARY MARKET
 
    There will not be any market for the Offered Certificates prior to the
issuance thereof. The Underwriter intends to act as a market maker in the
Offered Certificates, subject to applicable provisions of federal and state
securities laws and other regulatory requirements, but is under no obligation to
do so. There can be no assurance that a secondary market in the Offered
Certificates will develop or, if such a market does develop, that it will
provide holders of Offered Certificates with liquidity of investment at any
particular time or for the life of the Offered Certificates. As a source of
information concerning the Certificates and the Mortgage Loans, prospective
investors in Certificates
 
                                      S-88
<PAGE>
may obtain copies of the reports included in monthly statements to
Certificateholders described under "Description of Certificates -- Reports" upon
written request to the Trust Administrator at the Corporate Trust Office.
 
                                  UNDERWRITING
 
    Subject to the terms and conditions of the underwriting agreement dated July
12, 1996 and the terms agreement dated September 18, 1996 (together, the
"Underwriting Agreement") among Norwest Mortgage, the Seller and Donaldson,
Lufkin & Jenrette Securities Corporation, as underwriter (the "Underwriter"),
the Offered Certificates offered hereby are being purchased from the Seller by
the Underwriter upon issuance. The Underwriter is committed to purchase all of
the Offered Certificates if any Offered Certificates are purchased. The
Underwriter has advised the Seller that it proposes to offer the Offered
Certificates, from time to time, for sale in negotiated transactions or
otherwise at prices determined at the time of sale. Proceeds to the Seller from
the sale of the Offered Certificates are expected to be approximately 99.7175%
of the initial aggregate principal balance of the Class A Certificates (other
than the Class A-PO Certificates), approximately 67.5625% of the aggregate
initial principal balance of the Class A-PO Certificates, approximately 99.0372%
of the aggregate initial principal balance of the Class M Certificates,
approximately 98.2352% of the aggregate initial principal balance of the Class
B-1 Certificates and approximately 95.8868% of the aggregate initial principal
balance of the Class B-2 Certificates plus, in each case, accrued interest
thereon, other than on an amount equal to the aggregate initial principal
balance of the Class A-PO Certificates, at the rate of 7.50% per annum from
October 1, 1996 to (but not including) October 29, 1996, before deducting
expenses payable by the Seller. The Underwriter, which is not an affiliate of
the Seller, has advised the Seller that the Underwriter has not allocated the
purchase price paid to the Seller for the Subclasses of Class A Certificates
(other than the Class A-PO Certificates) among such Subclasses. The Underwriter
and any dealers that participate with the Underwriter in the distribution of the
Offered Certificates may be deemed to be underwriters, and any discounts or
commissions received by them and any profit on the resale of Offered
Certificates by them may be deemed to be underwriting discounts or commissions,
under the Securities Act.
 
    The Underwriting Agreement provides that the Seller or Norwest Mortgage will
indemnify the Underwriter against certain civil liabilities under the Securities
Act or contribute to payments which the Underwriter may be required to make in
respect thereof.
 
                                 LEGAL MATTERS
 
    The validity of the Offered Certificates and certain tax matters with
respect thereto will be passed upon for the Seller by Cadwalader, Wickersham &
Taft, New York, New York. Certain legal matters will be passed upon for the
Underwriters by Brown & Wood LLP, New York, New York.
 
                                USE OF PROCEEDS
 
    The net proceeds to be received from the sale of the Offered Certificates
will be applied by the Seller to the purchase from Norwest Mortgage of the
Mortgage Loans underlying the Series 1996-7 Certificates.
 
                                    RATINGS
 
    It is a condition to the issuance of the Class A Certificates that each
Subclass will have been rated "AAA" by Fitch. It is a condition to the issuance
of the Class A Certificates (other than the Class A-7 and Class A-PO
Certificates) that each Subclass will have been rated "AAA" by S&P. It is a
condition to the issuance of the Class A-7 and Class A-PO Certificates that such
Subclass will have been rated "AAAr" by S&P.  S&P assigns the additional rating
of "r" to highlight classes of securities that S&P believes may experience high
volatility or high variability in expected returns due to non-credit risks. It
is a condition to the issuance of the Class M Certificates that they will have
been rated at least "AA"
 
                                      S-89
<PAGE>
by Fitch and S&P. It is a condition to the issuance of the Class B-1 and Class
B-2 Certificates that they will have been rated "A" and "BBB," respectively, by
Fitch. 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 of S&P on mortgage pass-through certificates address the
likelihood of the receipt by certificateholders of timely payments of interest
and the ultimate return of principal. S&P ratings take into consideration the
credit quality of the mortgage pool, including any credit support providers,
structural and legal aspects associated with the certificates, and the extent to
which the payment stream on the mortgage pool is adequate to make payments
required under the certificates. S&P's ratings on such certificates do not,
however, constitute a statement regarding frequency of prepayments on the
mortgage loans. S&P's rating does not address the possibility that investors may
suffer a lower than anticipated yield as a result of prepayments of the
underlying mortgages. In addition, it should be noted that in some structures a
default on a mortgage is treated as a prepayment and may have the same effect on
yield as a prepayment.
 
    The ratings of Fitch on mortgage pass-through certificates address the
likelihood of the receipt by certificateholders of all distributions to which
such certificateholders are entitled. Fitch's rating opinions address the
structural and legal aspects associated with the certificates, including the
nature of the underlying mortgage loans. Fitch's ratings on pass-through
certificates do not represent any assessment of the likelihood or rate of
principal prepayments and consequently any adverse effect the timing of such
prepayments could have on an investor's anticipated yield.
 
    The Seller has not requested a rating on the Offered Certificates of any
Subclass or Class by any rating agency other than Fitch and S&P, although data
with respect to the Mortgage Loans may have been provided to other rating
agencies solely for their informational purposes. There can be no assurance that
any rating assigned by any other rating agency to the Offered Certificates will
be as high as those assigned by Fitch and S&P.
 
                                      S-90
<PAGE>
                              INDEX OF SIGNIFICANT
                       PROSPECTUS SUPPLEMENT DEFINITIONS
<TABLE>
<CAPTION>
TERM                                                PAGE
- ------------------------------------------------  ---------
<S>                                               <C>
15 Year Mortgage Loans..........................  S-74
Adjusted Pool Amount............................  S-35
Adjusted Pool Amount (PO Portion)...............  S-36
Adjustment Amount...............................  S-54
Aggregate Current Bankruptcy Losses.............  S-54
Aggregate Current Fraud Losses..................  S-54
Aggregate Current Special Hazard Losses.........  S-53
Available Master Servicing Compensation.........  S-36
Bankruptcy Loss.................................  S-41
Bankruptcy Loss Amount..........................  S-55
Beneficial Owner................................  S-30
Book-Entry Certificates.........................  S-3
Bulk Purchase Underwritten Loans................  S-13
CBE.............................................  S-73
Cede............................................  S-30
Certificate Account.............................  S-84
Certificateholder...............................  S-3
Certificates....................................  S-6
Class A Certificates............................  Cover
Class A Non-PO Distribution Amount..............  S-33
Class A Non-PO Optimal Amount...................  S-38
Class A Non-PO Optimal Principal Amount.........  S-40
Class A Non-PO Principal Balance................  S-35
Class A Non-PO Principal Distribution Amount....  S-39
Class A Optimal Amount..........................  S-38
Class A Percentage..............................  S-17
Class A Prepayment Percentage...................  S-17
Class A Principal Balance.......................  S-35
Class A Subclass Interest Accrual Amount........  S-34
Class A Subclass Interest Shortfall Amount......  S-38
Class A Subclass Principal Balance..............  S-35
Class A Voting Interest.........................  S-78
Class A-4 Percentage............................  S-47
Class A-4 Prepayment Shift Percentage...........  S-48
Class A-4 Priority Amount.......................  S-47
Class A-7 Notional Amount.......................  S-34
Class A-PO Deferred Amount......................  S-33
Class A-PO Distribution Amount..................  S-42
Class A-PO Optimal Principal Amount.............  S-42
Class B Certificates............................  Cover
Class B Principal Balance.......................  S-35
Class B Subclass Distribution Amount............  S-33
Class B Subclass Interest Accrual Amount........  S-35
Class B Subclass Interest Shortfall Amount......  S-35
Class B Subclass Principal Balance..............  S-35
 
<CAPTION>
TERM                                                PAGE
- ------------------------------------------------  ---------
<S>                                               <C>
Class B Voting Interest.........................  S-78
Class B-1 Principal Distribution Amount.........  S-44
Class B-2 Principal Distribution Amount.........  S-44
Class M Certificates............................  Cover
Class M Distribution Amount.....................  S-33
Class M Interest Accrual Amount.................  S-34
Class M Interest Shortfall Amount...............  S-38
Class M Optimal Amount..........................  S-38
Class M Optimal Principal Amount................  S-43
Class M Percentage..............................  S-45
Class M Prepayment Percentage...................  S-45
Class M Principal Balance.......................  S-35
Class M Principal Distribution Amount...........  S-43
Closing Date....................................  S-12
Code............................................  S-27
Compensating Interest...........................  S-36
Co-op Shares....................................  S-56
Cooperatives....................................  S-56
Cross-Over Date.................................  S-52
Current Class B-1 Fractional Interest...........  S-46
Current Class B-2 Fractional Interest...........  S-47
Current Class B-3 Fractional Interest...........  S-47
Current Class B-4 Fractional Interest...........  S-47
Current Class M Fractional Interest.............  S-46
Curtailment Interest Shortfalls.................  S-37
Cut-Off Date Aggregate Principal Balance........  S-56
Debt Service Reduction..........................  S-41
Deficient Valuation.............................  S-41
Definitive Certificates.........................  S-10
Determination Date..............................  S-30
Discount Mortgage Loans.........................  S-3
Disqualified Organization.......................  S-4
Distribution Date...............................  S-30
DOL.............................................  S-87
DTC.............................................  S-10
Enhancement Act.................................  S-88
ERISA...........................................  S-86
ERISA Plan......................................  S-86
Excess Bankruptcy Loss..........................  S-54
Excess Bankruptcy Losses........................  S-54
Excess Fraud Loss...............................  S-54
Excess Fraud Losses.............................  S-54
Excess Special Hazard Loss......................  S-53
Excess Special Hazard Losses....................  S-53
Exemption.......................................  S-87
Fitch...........................................  S-7
Fixed 15-Year Non-relocation NMI Frederick
 Portfolio Loans................................  S-62
Fixed 15-Year NMI Non-Frederick Portfolio
 Loans..........................................  S-62
Fixed NMI Frederick Portfolio Loans.............  S-62
Fixed Retained Yield............................  S-83
</TABLE>
 
                                      S-91
<PAGE>
<TABLE>
<CAPTION>
TERM                                                PAGE
- ------------------------------------------------  ---------
<S>                                               <C>
Fraud Loss......................................  S-41
Fraud Loss Amount...............................  S-54
Hurricane.......................................  S-58
Hurricane Counties..............................  S-58
Jumbo Loans.....................................  S-62
Liquidated Loan.................................  S-40
Liquidated Loan Loss............................  S-41
Loss Severity Percentage........................  S-76
Lower-Tier REMIC................................  S-4
Lower-Tier REMIC Regular Interest...............  S-84
Master Servicer.................................  S-2
Master Servicing Fee............................  S-79
Master Servicing Fee Rate.......................  S-79
Mid-Month Receipt Period........................  S-86
Month End Interest..............................  S-36
Mortgage Loans..................................  S-2
Mortgaged Properties............................  S-56
Mortgages.......................................  S-56
NASCOR..........................................  Cover
Net Foreclosure Profits.........................  S-48
Net Mortgage Interest Rate......................  S-36
Net Partial Liquidation Proceeds................  S-32
NMI Frederick Portfolio Loans...................  S-62
NMI Non-Frederick Portfolio Loans...............  S-62
Non-PO Fraction.................................  S-40
Non-PO Voting Interest..........................  S-78
Non-Supported Interest Shortfalls...............  S-16
Northeast Floods................................  S-58
Norwest Bank....................................  S-6
Norwest Correspondent...........................  S-57
Norwest Frederick-Serviced Loans................  S-81
Norwest Mortgage................................  S-6
Norwest Mortgage Correspondent..................  S-2
Norwest Non-Frederick-Serviced Loans............  S-81
Offered Certificates............................  Cover
Offered Class B Certificates....................  Cover
Original Subordinated Principal Balance.........  S-42
Original Class B-1 Fractional Interest..........  S-46
Original Class B-2 Fractional Interest..........  S-46
Original Class B-3 Fractional Interest..........  S-47
Original Class B-4 Fractional Interest..........  S-47
Original Class M Fractional Interest............  S-46
Other Servicers.................................  S-80
Partial Liquidation Proceeds....................  S-32
Pass-Through Rate...............................  S-15
Percentage Interest.............................  S-33
Periodic Advance................................  S-49
PHMC............................................  S-62
PHMC Acquisition................................  S-62
PHMSC Pool......................................  S-74
Plan............................................  S-87
PO Fraction.....................................  S-18
Pool Balance (Non-PO Portion)...................  S-9
Pool Balance (PO Portion).......................  S-9
Pool Certification Underwritten Loans...........  S-13
Pool Distribution Amount........................  S-30
Pool Distribution Amount Allocation.............  S-32
<CAPTION>
TERM                                                PAGE
- ------------------------------------------------  ---------
<S>                                               <C>
Pooling and Servicing Agreement.................  S-82
Premium Mortgage Loans..........................  S-57
Prepayments in Full.............................  S-36
Prepayment Interest Shortfalls..................  S-36
Prior Month Receipt Period......................  S-82
Prospectus......................................  S-6
PTE 83-1........................................  S-87
PTE 95-60.......................................  S-87
Realized Loss...................................  S-40
Record Date.....................................  S-30
Regular Certificates............................  S-84
REMIC...........................................  S-4
Relocation Mortgage Loans.......................  S-56
Remittance Date.................................  S-32
REO Property....................................  S-80
Residual Certificate............................  S-84
S&P.............................................  S-7
Scheduled Principal Amount......................  S-48
Scheduled Principal Balance.....................  S-40
SDA.............................................  S-75
Securities Act..................................  S-88
Seller..........................................  S-2
Senior Certificates.............................  S-8
Series 1996-7 Certificates......................  Cover
Servicer........................................  S-2
Servicers.......................................  S-80
Servicer Custodial Account......................  S-81
Servicing Fee Rate..............................  S-83
Similar Law.....................................  S-87
SPA.............................................  S-69
Special Hazard Loss.............................  S-41
Special Hazard Loss Amount......................  S-53
Structuring Assumptions.........................  S-70
Subclass........................................  Cover
Subclass B Optimal Amount.......................  S-39
Subclass B Optimal Principal Amount.............  S-44
Subclass B Percentage...........................  S-45
Subclass B Prepayment Percentage................  S-45
Subordinated Certificates.......................  S-8
Subordinated Percentage.........................  S-42
Subordinated Prepayment Percentage..............  S-42
Target Regime...................................  S-83
Trust Administrator.............................  S-7
Trust Estate....................................  S-2
Trustee.........................................  S-7
U.S. Person.....................................  S-4
UGRIC...........................................  S-13
Underlying Servicing Agreement..................  S-6
Underwriter.....................................  Cover
Underwriting Agreement..........................  S-89
Underwriting Standards..........................  S-13
Unscheduled Principal Amount....................  S-48
Unscheduled Principal Receipt Period............  S-82
Unscheduled Principal Receipts..................  S-31
Upper-Tier REMIC................................  S-4
Wildfires.......................................  S-58
</TABLE>
 
                                      S-92
<PAGE>
                      NORWEST ASSET SECURITIES CORPORATION
                                   ("NASCOR")
 
                                     SELLER
 
                       MORTGAGE PASS-THROUGH CERTIFICATES
                              (ISSUABLE IN SERIES)
                             ---------------------
 
    Norwest  Asset Securities  Corporation (the  "Seller" or  "NASCOR") may sell
from time to time, under this Prospectus and applicable Prospectus  Supplements,
Mortgage  Pass-Through  Certificates  (the "Certificates"),  issuable  in series
(each, a  "Series") consisting  of one  or  more classes  (each, a  "Class")  of
Certificates.  Any  Class  of  Certificates  may be  divided  into  two  or more
subclasses (each, a "Subclass").
 
    The Certificates of a Series  will represent beneficial ownership  interests
in  a separate trust formed by the Seller.  The property of each such trust (for
each Series,  the  "Trust Estate")  will  be  comprised primarily  of  fixed  or
adjustable  interest  rate, conventional,  first  mortgage loans  (the "Mortgage
Loans"), secured by  one- to  four-family residential  properties. The  Mortgage
Loans  will  have  been  acquired  by the  Seller  from  its  affiliate, Norwest
Mortgage, Inc. ("Norwest Mortgage"), and  will have been underwritten either  to
Norwest  Mortgage's underwriting standards,  to the underwriting  standards of a
Pool Insurer (as defined herein) or to such other standards as are described  in
the applicable Prospectus Supplement. All of the Mortgage Loans will be serviced
by  Norwest Mortgage individually  or together with one  or more other servicers
(each, a  "Servicer"). Norwest  Bank Minnesota,  National Association  ("Norwest
Bank"),  an  affiliate of  Norwest Mortgage,  will act  as master  servicer with
respect to each Trust Estate (in such capacity, the "Master Servicer").
 
    Each Series of Certificates may include one or more Classes of  Certificates
(the "Subordinated Certificates") that are subordinate in right of distributions
or  otherwise to one  or more of the  other Classes of  such Series (the "Senior
Certificates"). If  specified  in  the  applicable  Prospectus  Supplement,  the
relative  interests of the Senior Certificates and the Subordinated Certificates
of a Series in the Trust Estate may  be subject to adjustment from time to  time
on  the basis of distributions received  in respect thereof and losses allocated
to the  Subordinated  Certificates.  If  and to  the  extent  specified  in  the
Prospectus  Supplement,  credit  support  may  be  provided  for  any  Series of
Certificates, or any  Classes or Subclasses  thereof, in the  form of a  limited
guarantee,  financial guaranty insurance policy,  surety bond, letter of credit,
mortgage pool insurance  policy, reserve  fund, cross-support or  other form  of
credit enhancement as described herein or therein.
 
    Except  for  the Seller's  limited  obligations in  connection  with certain
breaches  of  its  representations  and  warranties,  certain  undertakings  and
obligations  of  the  Master  Servicer  and  Norwest  Mortgage's  obligations as
Servicer, the Certificates  will not  represent obligations of  the Seller,  the
Master  Servicer or Norwest Mortgage, or any affiliate of the Seller, the Master
Servicer or Norwest Mortgage.
 
    If specified in the  applicable Prospectus Supplement,  an election will  be
made  to  treat the  Trust Estate  (or one  or more  segregated pools  of assets
therein) underlying  a  Series  of  Certificates  as  a  "real  estate  mortgage
investment  conduit" (a "REMIC")  for federal income  tax purposes. See "Certain
Federal Income Tax Consequences."
 
    There will have  been no public  market for the  Certificates of any  Series
prior to the offering thereof. No assurance can be given that such a market will
develop,   or   that  if   such  a   market  does   develop,  it   will  provide
Certificateholders with liquidity of investment or will continue for the life of
the Certificates.
                            ------------------------
 
THESE SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES  AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND  EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
      THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
            THE                  CONTRARY IS A CRIMINAL OFFENSE.
                            ------------------------
 
    The Certificates may be sold from time to time through one or more different
methods, including through underwriting syndicates  led by one or more  managing
underwriters  or through  one or  more underwriters  acting alone.  See "Plan of
Distribution." Affiliates of the Seller may from  time to time act as agents  or
underwriters in connection with the sale of the Certificates.
 
    This  Prospectus may not be used  to consummate sales of Certificates unless
accompanied by  the  Prospectus Supplement  relating  to the  offering  of  such
Certificates.
                            ------------------------
 
                THE DATE OF THIS PROSPECTUS IS OCTOBER 24, 1996
<PAGE>
 
                                    REPORTS
 
    The  Master Servicer  will prepare,  and the  Trustee or  other Paying Agent
appointed  for  each  Series  by  the  Master  Servicer  will  forward  to   the
Certificateholders of each Series statements containing information with respect
to  principal and interest  payments and the related  Trust Estate, as described
herein  and  in  the  applicable  Prospectus  Supplement  for  such  Series.  No
information  contained in such reports will  have been examined or reported upon
by an independent public accountant. See "The Pooling and Servicing Agreement --
Reports to Certificateholders." In addition, each Servicer for each Series  will
furnish  to the Master Servicer (who will be required to furnish promptly to the
Trustee for  such  Series),  a  statement from  a  firm  of  independent  public
accountants  with respect  to the examination  of certain  documents and records
relating to a random sample of mortgage loans serviced by such Servicer pursuant
to the related Underlying Servicing  Agreement and/or other similar  agreements.
See  "Servicing of the Mortgage  Loans -- Evidence as  to Compliance." Copies of
the statements provided by the Master Servicer to the Trustee will be  furnished
to  Certificateholders of each Series upon  request addressed to the Trustee for
the applicable Series  or to  the Master  Servicer c/o  Norwest Bank  Minnesota,
National  Association, 11000 Broken Land Parkway, Columbia, Maryland 21044-3562,
Attention: Securities Administration Services Manager.
 
                             ADDITIONAL INFORMATION
 
    This Prospectus contains, and the  Prospectus Supplement for each Series  of
Certificates  will contain,  a summary  of the  material terms  of the documents
referred to herein and therein, but neither contains nor will contain all of the
information set forth in the Registration Statement of which this Prospectus  is
a  part.  For  further  information,  reference  is  made  to  such Registration
Statement and  the  exhibits  thereto  which  the  Seller  has  filed  with  the
Securities  and Exchange Commission (the  "Commission"), Washington, D.C., under
the Securities  Act  of 1933,  as  amended (the  "Securities  Act").  Statements
contained in this Prospectus and any Prospectus Supplement as to the contents of
any  contract or other document referred to are summaries and, in each instance,
reference is made  to the copy  of the contract  or other document  filed as  an
exhibit  to the Registration  Statement, each such  statement being qualified in
all respects by  such reference.  Copies of  the Registration  Statement may  be
obtained  from the Public Reference Section  of the Commission, Washington, D.C.
20549 upon payment of the prescribed charges, or may be examined free of  charge
at the Commission's offices, 450 Fifth Street N.W., Washington, D.C. 20549 or at
the  regional offices of the Commission located at Room 1400, 75 Park Place, New
York, New York 10007 and 14th Floor, 500 West Madison Street, Chicago,  Illinois
60661.  The Commission also maintains  a site on the  World Wide Web at "http://
www.sec.gov" at which users can view  and download copies of reports, proxy  and
information  statements and  other information filed  electronically through the
Electronic Data Gathering, Analysis and  Retrieval ("EDGAR") system. The  Seller
has  filed the Registration  Statement, including all  exhibits thereto, through
the EDGAR system  and therefore such  materials should be  available by  logging
onto  the  Commission's Web  site. The  Commission maintains  computer terminals
providing access to the EDGAR system at  each of the offices referred to  above.
Copies  of any  documents incorporated herein  by reference will  be provided to
each person  to whom  a Prospectus  is delivered  upon written  or oral  request
directed   to  Norwest  Asset  Securities   Corporation,  5325  Spectrum  Drive,
Frederick, Maryland 21701, telephone number (301) 846-8881.
 
                        ADDITIONAL DETAILED INFORMATION
 
    The  Seller  intends  to  offer  by  subscription  detailed  mortgage   loan
information in machine readable format updated on a monthly basis (the "Detailed
Information")  with  respect to  each  outstanding Series  of  Certificates. The
Detailed Information  will  reflect payments  made  on the  individual  mortgage
loans, including prepayments in full and in part made on such mortgage loans, as
well  as the liquidation of  any such mortgage loans,  and will identify various
characteristics of the mortgage loans.  Subscribers of the Detailed  Information
are  expected to include a number of major investment brokerage firms as well as
financial information  service  firms. Some  of  such firms,  including  certain
 
                                       2
<PAGE>
investment   brokerage  firms  as  well  as  Bloomberg  L.P.  through  the  "The
Bloomberg-Registered Trademark-" service and Merrill Lynch Mortgage Capital Inc.
through the "CMO  Passport -Registered Trademark-"  service, may, in  accordance
with  their  individual  business  practices and  fee  schedules,  if  any, make
portions of, or summaries of portions of, the Detailed Information available  to
their  customers  and subscribers.  The Seller,  the  Master Servicer  and their
respective affiliates have no  control over and take  no responsibility for  the
actions   of  such  firms   in  processing,  analyzing   or  disseminating  such
information. For  further information  regarding  the Detailed  Information  and
subscriptions thereto, please contact Norwest Asset Securities Corporation, 5325
Spectrum Drive, Frederick, Maryland 21701, telephone number (301) 846-8881.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
    There  are incorporated herein by reference  all documents and reports filed
or caused to  be filed  by NASCOR  with respect to  a Trust  Estate pursuant  to
Section  13(a), 13(c), 14 or 15(d) of the Exchange Act, prior to the termination
of an offering of Certificates  evidencing interests therein. Upon request,  the
Master  Servicer 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 Trust Estate pursuant to Section 13(a), 13(c), 14 or 15(d) of the  Exchange
Act  since NASCOR's latest fiscal year covered by its annual report on Form 10-K
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 of
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 Master Servicer should be directed to: Norwest Asset
Securities  Corporation,  5325  Spectrum   Drive,  Frederick,  Maryland   21701,
telephone number (301) 846-8881.
 
                                       3
<PAGE>
                               TABLE OF CONTENTS
                                   PROSPECTUS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Reports....................................................................................................          2
Additional Information.....................................................................................          2
Additional Detailed Information............................................................................          2
Incorporation of Certain Information by Reference..........................................................          3
Summary of Prospectus......................................................................................          8
  Title of Securities......................................................................................          8
  Seller...................................................................................................          8
  Servicers................................................................................................          8
  Master Servicer..........................................................................................          8
  The Trust Estates........................................................................................          8
  Description of the Certificates..........................................................................          9
  Distributions on the Certificates........................................................................          9
  Cut-Off Date.............................................................................................          9
  Distribution Dates.......................................................................................          9
  Record Dates.............................................................................................         10
  Credit Enhancement.......................................................................................         10
  Periodic Advances........................................................................................         10
  Forms of Certificates....................................................................................         11
  Optional Purchase of Defaulted Mortgage Loans............................................................         11
  Optional Purchase of All Mortgage Loans..................................................................         11
  ERISA Limitations........................................................................................         11
  Tax Status...............................................................................................         12
  Legal Investment.........................................................................................         12
  Rating...................................................................................................         12
Risk Factors...............................................................................................         13
  Limited Liquidity........................................................................................         13
  Limited Obligations......................................................................................         13
  Limitations, Reduction and Substitution of Credit Enhancement............................................         13
  Risks of the Mortgage Loans..............................................................................         14
  Yield and Prepayment Considerations......................................................................         14
  Book-Entry System for Certain Classes and Subclasses of Certificates.....................................         15
The Trust Estates..........................................................................................         15
  General..................................................................................................         15
  Mortgage Loans...........................................................................................         15
    Fixed Rate Loans.......................................................................................         16
    Adjustable Rate Loans..................................................................................         17
    Graduated Payment Loans................................................................................         17
    Subsidy Loans..........................................................................................         17
    Buy-Down Loans.........................................................................................         18
    Balloon Loans..........................................................................................         19
The Seller.................................................................................................         19
Norwest Mortgage...........................................................................................         19
Norwest Bank...............................................................................................         20
The Mortgage Loan Programs.................................................................................         20
  Mortgage Loan Production Sources.........................................................................         20
  Acquisition of Mortgage Loans from Correspondents........................................................         21
  Mortgage Loan Underwriting...............................................................................         21
    Norwest Mortgage Underwriting..........................................................................         21
</TABLE>
 
                                       4
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
    Pool Certification Underwriting........................................................................         25
  Representations and Warranties...........................................................................         27
Description of the Certificates............................................................................         30
  General..................................................................................................         30
  Definitive Form..........................................................................................         31
  Book-Entry Form..........................................................................................         32
  Distributions to Certificateholders......................................................................         33
    General................................................................................................         33
    Distributions of Interest..............................................................................         35
    Distributions of Principal.............................................................................         35
  Other Credit Enhancement.................................................................................         37
    Limited Guarantee......................................................................................         37
    Financial Guaranty Insurance Policy or Surety Bond.....................................................         37
    Letter of Credit.......................................................................................         37
    Pool Insurance Policies................................................................................         38
    Special Hazard Insurance Policies......................................................................         38
    Mortgagor Bankruptcy Bond..............................................................................         38
    Reserve Fund...........................................................................................         38
    Cross Support..........................................................................................         38
Prepayment and Yield Considerations........................................................................         39
  Pass-Through Rates.......................................................................................         39
  Scheduled Delays in Distributions........................................................................         39
  Effect of Principal Prepayments..........................................................................         39
  Weighted Average Life of Certificates....................................................................         40
Servicing of the Mortgage Loans............................................................................         41
  The Master Servicer......................................................................................         41
  The Servicers............................................................................................         42
  Payments on Mortgage Loans...............................................................................         43
  Periodic Advances and Limitations Thereon................................................................         46
  Collection and Other Servicing Procedures................................................................         47
  Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage Loans............................         47
  Insurance Policies.......................................................................................         49
  Fixed Retained Yield, Servicing Compensation and Payment of Expenses.....................................         50
  Evidence as to Compliance................................................................................         51
Certain Matters Regarding the Master Servicer..............................................................         52
The Pooling and Servicing Agreement........................................................................         53
  Assignment of Mortgage Loans to the Trustee..............................................................         53
  Optional Purchases.......................................................................................         54
  Reports to Certificateholders............................................................................         55
  List of Certificateholders...............................................................................         56
  Events of Default........................................................................................         56
  Rights Upon Event of Default.............................................................................         56
  Amendment................................................................................................         57
  Termination; Optional Purchase of Mortgage Loans.........................................................         58
  The Trustee..............................................................................................         58
Certain Legal Aspects of the Mortgage Loans................................................................         59
  General..................................................................................................         59
  Foreclosure..............................................................................................         59
  Foreclosure on Shares of Cooperatives....................................................................         60
  Rights of Redemption.....................................................................................         61
  Anti-Deficiency Legislation and Other Limitations on Lenders.............................................         61
</TABLE>
 
                                       5
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
  Soldiers' and Sailors' Civil Relief Act and Similar Laws.................................................         63
  Environmental Considerations.............................................................................         63
  "Due-on-Sale" Clauses....................................................................................         64
  Applicability of Usury Laws..............................................................................         65
  Enforceability of Certain Provisions.....................................................................         65
Certain Federal Income Tax Consequences....................................................................         66
  Federal Income Tax Consequences for REMIC Certificates...................................................         66
  General..................................................................................................         66
  Status of REMIC Certificates.............................................................................         67
  Qualification as a REMIC.................................................................................         67
  Taxation of Regular Certificates.........................................................................         69
    General................................................................................................         69
    Original Issue Discount................................................................................         69
    Acquisition Premium....................................................................................         72
    Variable Rate Regular Certificates.....................................................................         72
    Market Discount........................................................................................         73
    Premium................................................................................................         74
    Election to Treat All Interest Under the Constant Yield Method.........................................         74
    Treatment of Losses....................................................................................         75
    Sale or Exchange of Regular Certificates...............................................................         75
  Taxation of Residual Certificates........................................................................         76
    Taxation of REMIC Income...............................................................................         76
    Basis and Losses.......................................................................................         76
    Treatment of Certain Items of REMIC Income and Expense.................................................         78
    Original Issue Discount and Premium....................................................................         78
    Market Discount........................................................................................         78
    Premium................................................................................................         78
    Limitations on Offset or Exemption of REMIC Income.....................................................         79
    Tax-Related Restrictions on Transfer of Residual Certificates..........................................         79
    Disqualified Organizations.............................................................................         79
    Noneconomic Residual Interests.........................................................................         81
    Foreign Investors......................................................................................         81
    Sale or Exchange of a Residual Certificate.............................................................         82
    Mark to Market Regulations.............................................................................         82
  Taxes That May Be Imposed on the REMIC Pool..............................................................         82
    Prohibited Transactions................................................................................         82
    Contributions to the REMIC Pool After the Startup Day..................................................         83
    Net Income from Foreclosure Property...................................................................         83
  Liquidation of the REMIC Pool............................................................................         83
  Administrative Matters...................................................................................         83
  Limitations on Deduction of Certain Expenses.............................................................         84
  Taxation of Certain Foreign Investors....................................................................         84
    Regular Certificates...................................................................................         84
    Residual Certificates..................................................................................         85
  Backup Withholding.......................................................................................         85
  Reporting Requirements...................................................................................         85
</TABLE>
 
                                       6
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
  Federal Income Tax Consequences for Certificates as to Which No REMIC Election is Made...................         86
    General................................................................................................         86
    Tax Status.............................................................................................         87
    Premium and Discount...................................................................................         87
    Premium................................................................................................         87
    Original Issue Discount................................................................................         87
    Market Discount........................................................................................         88
    Recharacterization of Servicing Fees...................................................................         88
    Sale or Exchange of Certificates.......................................................................         89
  Stripped Certificates....................................................................................         89
    General................................................................................................         89
    Status of Stripped Certificates........................................................................         90
    Taxation of Stripped Certificates......................................................................         91
    Original Issue Discount................................................................................         91
    Sale or Exchange of Stripped Certificates..............................................................         91
    Purchase of More Than One Class of Stripped Certificates...............................................         92
    Possible Alternative Characterizations.................................................................         92
  Reporting Requirements and Backup Withholding............................................................         92
  Taxation of Certain Foreign Investors....................................................................         92
ERISA Considerations.......................................................................................         93
  General..................................................................................................         93
  Certain Requirements Under ERISA.........................................................................         93
    General................................................................................................         93
    Parties in Interest/Disqualified Persons...............................................................         93
    Delegation of Fiduciary Duty...........................................................................         94
  Administrative Exemptions................................................................................         94
    Individual Administrative Exemptions...................................................................         94
    PTE 83-1...............................................................................................         95
  Exempt Plans.............................................................................................         96
  Unrelated Business Taxable Income -- Residual Certificates...............................................         96
Legal Investment...........................................................................................         97
Plan of Distribution.......................................................................................         98
Use of Proceeds............................................................................................         99
Legal Matters..............................................................................................         99
Rating.....................................................................................................         99
Index of Significant Definitions...........................................................................        100
</TABLE>
 
                                       7
<PAGE>
                             SUMMARY OF PROSPECTUS
 
    THE  FOLLOWING IS  QUALIFIED IN  ITS ENTIRETY  BY REFERENCE  TO THE DETAILED
INFORMATION APPEARING  ELSEWHERE IN  THIS PROSPECTUS,  AND BY  REFERENCE TO  THE
INFORMATION  WITH  RESPECT  TO  EACH SERIES  OF  CERTIFICATES  CONTAINED  IN THE
APPLICABLE  PROSPECTUS  SUPPLEMENT.  CERTAIN  CAPITALIZED  TERMS  USED  AND  NOT
OTHERWISE  DEFINED  HEREIN  SHALL  HAVE THE  MEANINGS  GIVEN  ELSEWHERE  IN THIS
PROSPECTUS.
 
<TABLE>
<CAPTION>
Title of Securities...............  Mortgage Pass-Through Certificates (Issuable in Series).
<S>                                 <C>
Seller............................  Norwest Asset Securities  Corporation (the "Seller"),  a
                                    direct,  wholly-owned  subsidiary  of  Norwest Mortgage,
                                    Inc.  ("Norwest  Mortgage"),   which  is  an   indirect,
                                    wholly-owned subsidiary of Norwest Corporation ("Norwest
                                    Corporation"). See "The Seller."
Servicers.........................  Norwest  Mortgage and,  to the  extent specified  in the
                                    applicable Prospectus  Supplement,  one  or  more  other
                                    entities  identified therein  (each, a  "Servicer") will
                                    service the  Mortgage  Loans  contained  in  each  Trust
                                    Estate.  Each  Servicer will  perform  certain servicing
                                    functions with respect to the Mortgage Loans serviced by
                                    it pursuant to a  related Servicing Agreement (each,  an
                                    "Underlying Servicing Agreement"). See "Servicing of the
                                    Mortgage Loans."
Master Servicer...................  Norwest  Bank Minnesota,  National Association ("Norwest
                                    Bank" and,  in such  capacity, the  "Master  Servicer").
                                    Norwest  Bank  is a  direct, wholly-owned  subsidiary of
                                    Norwest Corporation and an affiliate of the Seller.  The
                                    Master  Servicer  will  perform  certain administration,
                                    calculation and reporting functions with respect to each
                                    Trust Estate and will  supervise the Servicers, in  each
                                    case,  pursuant to a Pooling and Servicing Agreement. In
                                    addition, the Master Servicer will generally be required
                                    to make  Periodic  Advances  (to  the  extent  described
                                    herein) with respect to the Mortgage Loans in each Trust
                                    Estate  to the  extent that the  related Servicer (other
                                    than Norwest Mortgage) fails to make a required Periodic
                                    Advance. See  "Servicing of  the Mortgage  Loans --  The
                                    Master   Servicer"   and  "--   Periodic   Advances  and
                                    Limitations Thereon."
The Trust Estates.................  Each Trust  Estate will  be formed  and each  Series  of
                                    Certificates  will be  issued pursuant to  a pooling and
                                    servicing agreement  (each,  a  "Pooling  and  Servicing
                                    Agreement")  among the  Seller, the  Master Servicer and
                                    the  Trustee  specified  in  the  applicable  Prospectus
                                    Supplement.  Each  Trust  Estate  will  consist  of  the
                                    related Mortgage Loans  (other than  the Fixed  Retained
                                    Yield  (as defined  herein), if  any) and  certain other
                                    related  property,  as   specified  in  the   applicable
                                    Prospectus   Supplement.  The  Mortgage  Loans  will  be
                                    conventional,  fixed   or  adjustable   interest   rate,
                                    mortgage  loans  secured  by  first  liens  on  one-  to
                                    four-family residential properties.
                                    The Mortgage Loans will have been acquired by the Seller
                                    from its affiliate Norwest Mortgage. The Mortgage  Loans
                                    will  have  been originated  by  Norwest Mortgage  or an
                                    affiliate or will have been acquired by Norwest Mortgage
                                    directly  or   indirectly  from   other  mortgage   loan
                                    originators.  All of  the Mortgage Loans  will have been
                                    underwritten either to Norwest
</TABLE>
 
                                       8
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Mortgage's standards,  to the  extent specified  in  the
                                    applicable  Prospectus Supplement, to the standards of a
                                    Pool Insurer or to standards otherwise specified in  the
                                    Prospectus  Supplement. See "The Trust Estates" and "The
                                    Mortgage Loan Programs -- Mortgage Loan Underwriting."
                                    The particular characteristics or expected
                                    characteristics of the Mortgage Loans and a  description
                                    of  the  other property,  if  any, included  in  a Trust
                                    Estate will be  set forth in  the applicable  Prospectus
                                    Supplement.
Description of the Certificates...  Each  Series of  Certificates will  include one  or more
                                    Classes,  any   of  which   may  consist   of   multiple
                                    Subclasses.  A Class or Subclass of Certificates will be
                                    entitled, to the  extent of funds  available, to  either
                                    (i)  principal and  interest payments in  respect of the
                                    related Mortgage  Loans, (ii)  principal  distributions,
                                    with   no   interest   distributions,   (iii)   interest
                                    distributions, with no  principal distributions or  (iv)
                                    such   other  distributions  as  are  described  in  the
                                    applicable Prospectus Supplement.
Distributions on the
Certificates......................  INTEREST. With respect to  each Series of  Certificates,
                                    interest  on the related Mortgage  Loans at the weighted
                                    average  of  the  applicable  Mortgage  Interest   Rates
                                    thereof (net of servicing fees and certain other amounts
                                    as  described  herein  or in  the  applicable Prospectus
                                    Supplement), will be  passed through to  holders of  the
                                    related  Classes  of Certificates  in the  aggregate, in
                                    accordance with the particular terms of each such  Class
                                    of Certificates. See "Description of the Certificates --
                                    Distributions  to Certificateholders -- Distributions of
                                    Interest" herein. Except as  otherwise specified in  the
                                    applicable Prospectus Supplement, interest on each Class
                                    and  Subclass of Certificates of each Series will accrue
                                    at the  pass-through rate  for each  Class and  Subclass
                                    indicated in the applicable Prospectus Supplement (each,
                                    a  "Pass-Through  Rate")  on  the  outstanding principal
                                    balance or notional amount thereof.
                                    PRINCIPAL. With  respect to  a Series  of  Certificates,
                                    principal   payments  (including  prepayments)  will  be
                                    passed through to holders of the related Certificates or
                                    otherwise applied in accordance with the related Pooling
                                    and  Servicing  Agreement  on  each  Distribution  Date.
                                    Distributions  in reduction of principal balance will be
                                    allocated  among   the   Classes   and   Subclasses   of
                                    Certificates  of a Series in the manner specified in the
                                    applicable Prospectus  Supplement. See  "Description  of
                                    the  Certificates -- Distributions to Certificateholders
                                    -- Distributions of Principal."
Cut-Off Date......................  The  date   specified  in   the  applicable   Prospectus
                                    Supplement.
Distribution Dates................  Distributions on the Certificates will generally be made
                                    on  the 25th day (or, if such day is not a business day,
                                    the business day following the 25th day) of each  month,
                                    commencing  with the month following  the month in which
                                    the   applicable   Cut-Off   Date   occurs   (each,    a
                                    "Distribution  Date"). If so specified in the applicable
                                    Prospectus Supplement, distributions on
</TABLE>
 
                                       9
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Certificates may  be made  on a  different day  of  each
                                    month or may be made quarterly, or semi-annually, on the
                                    dates specified in such Prospectus Supplement.
Record Dates......................  Distributions  will be made on each Distribution Date to
                                    Certificateholders of record at the close of business on
                                    (unless a different date is specified in the  applicable
                                    Prospectus  Supplement)  the  last business  day  of the
                                    month preceding  the month  in which  such  Distribution
                                    Date occurs (each, a "Record Date").
Credit Enhancement................  A Series of Certificates may include one or more Classes
                                    of  Senior  Certificates  and  one  or  more  Classes of
                                    Subordinated Certificates. The rights of the holders  of
                                    Subordinated   Certificates  of  a   Series  to  receive
                                    distributions with respect to the related Mortgage Loans
                                    will be subordinated  to such rights  of the holders  of
                                    the Senior Certificates of the same Series to the extent
                                    and  in the manner specified  in the applicable Prospec-
                                    tus  Supplement.  This  subordination  is  intended   to
                                    enhance  the  likelihood of  the  timely receipt  by the
                                    Senior Certificateholders of  their proportionate  share
                                    of  scheduled monthly principal and interest payments on
                                    the related Mortgage Loans  and to protect them  against
                                    losses.  This  protection will  be  effected by  (i) the
                                    preferential right of  the Senior Certificateholders  to
                                    receive, prior to any distribution being made in respect
                                    of  the related  Subordinated Certificates  on each Dis-
                                    tribution Date,  current  distributions on  the  related
                                    Mortgage  Loans of  principal and  interest due  them on
                                    each Distribution Date  out of the  funds available  for
                                    distributions  on such date,  (ii) by the  right of such
                                    holders to receive future distributions on the  Mortgage
                                    Loans  that  would otherwise  have  been payable  to the
                                    holders of Subordinated Certificates and/or (iii) by the
                                    prior allocation to the Subordinated Certificate of  all
                                    or  a  portion  of  losses  realized  on  the underlying
                                    Mortgage Loans.
                                    If so specified in the applicable Prospectus Supplement,
                                    the Certificates  of  any Series,  or  any one  or  more
                                    Classes  thereof, may be  entitled to the  benefits of a
                                    limited guarantee, financial guaranty insurance  policy,
                                    surety  bond, letter of  credit, mortgage pool insurance
                                    policy, reserve  fund, cross-support  or other  form  of
                                    credit   enhancement  as  specified  in  the  applicable
                                    Prospectus Supplement. See "Description of the  Certifi-
                                    cates -- Other Credit Enhancement."
Periodic Advances.................  In  the  event  of  delinquencies  in  payments  on  any
                                    Mortgage Loan, the Servicer servicing such Mortgage Loan
                                    will be obligated  to make advances  of cash  ("Periodic
                                    Advances") to the Servicer Custodial Account (as defined
                                    herein) to the extent that such Servicer determines such
                                    Periodic  Advances  would  be  recoverable  from  future
                                    payments and collections on such Mortgage Loan. Any such
                                    Periodic Advances will be reimbursable to such  Servicer
                                    as  described  herein and  in the  applicable Prospectus
                                    Supplement.  The  Master   Servicer  or  Trustee   will,
</TABLE>
 
                                       10
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    in  certain circumstances, be  required to make Periodic
                                    Advances upon a Servicer default. See "Servicing of  the
                                    Mortgage  Loans  --  Periodic  Advances  and Limitations
                                    Thereon."
Forms of Certificates.............  The Certificates will be issued either (i) in book-entry
                                    form ("Book-Entry Certificates") through the  facilities
                                    of The Depository Trust Company ("DTC") or (ii) in fully
                                    registered, certificated form ("Definitive
                                    Certificates").
                                    An  investor  in  a  Class  or  Subclass  of  Book-Entry
                                    Certificates will  not  receive a  physical  certificate
                                    representing  its ownership interest  in such Book-Entry
                                    Certificates, except  under extraordinary  circumstances
                                    which  are discussed in "Description of the Certificates
                                    -- Definitive  Form" in  this Prospectus.  Instead,  DTC
                                    will  effect  payments  and transfers  by  means  of its
                                    electronic  recordkeeping   services,   acting   through
                                    certain  participating organizations. This may result in
                                    certain  delays  in  receipt  of  distributions  by   an
                                    investor  and  may  restrict  an  investor's  ability to
                                    pledge its securities.  The rights of  investors in  the
                                    Book-Entry  Certificates may generally only be exercised
                                    through DTC  and  its participating  organizations.  See
                                    "Description  of the Certificates -- Book-Entry Form" in
                                    this Prospectus.
Optional Purchase of Defaulted
Mortgage Loans....................  The Seller or the Master  Servicer, may, subject to  the
                                    terms of the applicable Pooling and Servicing Agreement,
                                    purchase  any  defaulted Mortgage  Loan or  any Mortgage
                                    Loan as to which default is reasonably foreseeable  from
                                    the  related  Trust Estate.  See "Pooling  and Servicing
                                    Agreement -- Optional Purchases."
Optional Purchase of All Mortgage
Loans.............................  If  so  specified  in  the  Prospectus  Supplement  with
                                    respect  to a Series, all, but not less than all, of the
                                    Mortgage Loans  in  the  related Trust  Estate  and  any
                                    property acquired in respect thereof at the time, may be
                                    purchased  by the Seller, Norwest Mortgage or such other
                                    party as  is  specified  in  the  applicable  Prospectus
                                    Supplement,  in the manner and at the price specified in
                                    such  Prospectus  Supplement.  In  the  event  that   an
                                    election  is made to treat  the related Trust Estate (or
                                    one or more  segregated pools  of assets  therein) as  a
                                    REMIC,  any such purchase will be effected only pursuant
                                    to a "qualified liquidation,"  as defined under  Section
                                    860F(a)(4)(A)  of the Internal Revenue  Code of 1986, as
                                    amended (the "Code"). Exercise of the right of  purchase
                                    will  effect the early retirement of the Certificates of
                                    that Series. See "Prepayment and Yield Considerations."
ERISA Limitations.................  A fiduciary of any employee benefit plan subject to  the
                                    fiduciary  responsibility  provisions  of  the  Employee
                                    Retirement Income  Security  Act  of  1974,  as  amended
                                    ("ERISA"),  including the "prohibited transaction" rules
                                    thereunder, and to the  corresponding provisions of  the
                                    Code,   should  carefully  review  with  its  own  legal
                                    advisors   whether   the   purchase   or   holding    of
</TABLE>
 
                                       11
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Certificates could give rise to a transaction prohibited
                                    or  otherwise impermissible under ERISA or the Code. See
                                    "ERISA Considerations."
Tax Status........................  The treatment of the Certificates for federal income tax
                                    purposes will be determined by whether a REMIC  election
                                    is made with respect to a Series of Certificates and, if
                                    a  REMIC election  is made, by  whether the Certificates
                                    are  Regular  Interests   or  Residual  Interests.   See
                                    "Certain Federal Income Tax Consequences."
Legal Investment..................  The   applicable  Prospectus   Supplement  will  specify
                                    whether the  Class or  Classes of  Certificates  offered
                                    will   constitute  "mortgage   related  securities"  for
                                    purposes of  the Secondary  Mortgage Market  Enhancement
                                    Act  of  1984. Investors  whose investment  authority is
                                    subject to legal restrictions  should consult their  own
                                    legal  advisors to determine whether  and to what extent
                                    such Certificates constitute legal investments for them.
                                    See "Legal  Investment"  herein and  in  the  applicable
                                    Prospectus Supplement.
Rating............................  It is a condition to the issuance of the Certificates of
                                    any  Series offered  pursuant to  this Prospectus  and a
                                    Prospectus Supplement  that each  Class or  Subclass  be
                                    rated in one of the four highest rating categories by at
                                    least   one  nationally  recognized  statistical  rating
                                    organization (a "Rating Agency").  A security rating  is
                                    not   a  recommendation   to  buy,  sell   or  hold  the
                                    Certificates of any Series and is subject to revision or
                                    withdrawal at any time  by the assigning rating  agency.
                                    Further,  such  ratings  do not  address  the  effect of
                                    prepayments on the yield anticipated by an investor.
</TABLE>
 
                                       12
<PAGE>
                                  RISK FACTORS
 
    INVESTORS  SHOULD  CONSIDER, AMONG  OTHER THINGS,  THE FOLLOWING  FACTORS IN
CONNECTION WITH THE PURCHASE OF 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. Unless specified in the applicable Prospectus Supplement,
the Certificates will not be listed on any securities exchange.
 
LIMITED OBLIGATIONS
 
    Except for any  related insurance policies  and any reserve  fund or  credit
enhancement  described in  the applicable Prospectus  Supplement, Mortgage Loans
included in the related Trust Estate will be the sole source of payments on  the
Certificates  of a Series. The Certificates of  any Series will not represent an
interest in or obligation of NASCOR, Norwest Mortgage, Norwest Bank, the Trustee
or any of their affiliates, except for NASCOR's limited obligations with respect
to certain breaches  of its representations  and warranties, Norwest  Mortgage's
obligations  as  Servicer and  Norwest  Bank's obligations  as  Master Servicer.
Neither the Certificates of  any Series nor the  related Mortgage Loans will  be
guaranteed  or insured  by any  governmental agency  or instrumentality, NASCOR,
Norwest Mortgage, Norwest  Bank, the  Trustee, any  of their  affiliates or  any
other person. Consequently, in the event that payments on the Mortgage Loans are
insufficient  or  otherwise unavailable  to make  all  payments required  on the
Certificates, there will  be no  recourse to NASCOR,  Norwest Mortgage,  Norwest
Bank,  the  Trustee  or,  except  as  specified  in  the  applicable  Prospectus
Supplement, any other entity.
 
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 limited  guarantee; a  financial
guaranty  insurance policy; a surety bond; a  letter of credit; a pool insurance
policy; a  special  hazard insurance  policy;  a mortgagor  bankruptcy  bond;  a
reserve  fund; cross-support; and  any combination thereof.  See "Description of
the Certificates -- Other Credit Enhancement" 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, in  the sole  discretion of  the Master  Servicer, if  each
applicable Rating Agency indicates that the then current rating thereof will not
be  adversely  affected.  In the  event  losses  exceed the  amount  of coverage
provided by any credit enhancement or losses of a type not covered by any credit
enhancement occur,  such losses  will be  borne by  the holders  of the  related
Certificates  (or  certain  Classes  thereof).  The  rating  of  any  Series  of
Certificates by  any  applicable Rating  Agency  may be  lowered  following  the
initial  issuance thereof as a  result of the downgrading  of the obligations of
any applicable credit support provider, or as a result of losses on the  related
Mortgage Loans in excess of the levels contemplated by such Rating Agency at the
time  of its initial rating analysis.  Neither NASCOR, Norwest Mortgage, Norwest
Bank, nor  any  of their  affiliates  will have  any  obligation to  replace  or
supplement  any credit enhancement, or to take  any other action to maintain any
rating of any  Class of Certificates.  See "Description of  the Certificates  --
Other Credit Enhancement."
 
                                       13
<PAGE>
RISKS OF THE MORTGAGE LOANS
 
    An  investment  in  securities  such as  the  Certificates,  which generally
represent interests in pools of residential mortgage loans, may be affected  by,
among  other  things,  a  decline  in real  estate  values  and  changes  in the
mortgagor's financial condition. No  assurance can be given  that the values  of
the  Mortgaged  Properties  (as  defined  herein)  securing  the  Mortgage Loans
underlying any Series  of Certificates  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 contained in a
particular  Trust  Estate,  and  any   secondary  financing  on  the   Mortgaged
Properties,  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 and
those   experienced  in   Norwest  Mortgage's  or   other  Servicers'  servicing
portfolios. In addition to risk factors  related to the residential real  estate
market  generally, certain geographic regions of  the United States from time to
time will experience weaker regional economic conditions and housing markets  or
be  directly or indirectly  affected by natural  disasters or civil disturbances
such as earthquakes, hurricanes, floods,  eruptions or riots and,  consequently,
will  experience higher  rates of  loss and  delinquency than  on mortgage loans
generally. Although  Mortgaged Properties  located in  certain identified  flood
zones  will be required to be covered, to the maximum extent available, by flood
insurance, as  described under  "Servicing of  the Mortgage  Loans --  Insurance
Policies,"  no Mortgaged  Properties will  otherwise be  required to  be insured
against earthquake  damage of  any other  loss not  covered by  Standard  Hazard
Insurance  Policies,  as described  under "Servicing  of  the Mortgage  Loans --
Insurance  Policies."  Adverse  economic  conditions  generally,  in  particular
geographic  areas  or  industries,  or  affecting  particular  segments  of  the
borrowing community  (such  as  mortgagors  relying  on  commission  income  and
self-employed  mortgagors) and  other factors which  may or may  not affect real
property values (including the purposes for  which the Mortgage Loans were  made
and  the uses  of the  Mortgaged Properties)  may affect  the timely  payment by
mortgagors of scheduled payments of principal and interest on the Mortgage Loans
and, accordingly, the  actual rates  of delinquencies,  foreclosures and  losses
with  respect to any Trust Estate.  The Mortgage Loans underlying certain Series
of Certificates may be concentrated  in certain regions, and such  concentration
may  present  risk considerations  in addition  to  those generally  present for
similar mortgage-backed securities without such concentration. See "The Mortgage
Loan  Programs  --  Mortgage  Loan  Underwriting"  and  "Prepayment  and   Yield
Considerations  -- Weighted Average Life of  Certificates" herein. 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 Trust Estate
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. See
"The Trust  Estates  -- Mortgage  Loans"  and  "The Mortgage  Loan  Programs  --
Mortgage Loan Underwriting."
 
YIELD AND PREPAYMENT CONSIDERATIONS
 
    The yield of the Certificates of each Series will depend in part on the rate
of  principal payment on the Mortgage Loans (including prepayments, liquidations
due to defaults  and mortgage  loan repurchases).  Such yield  may be  adversely
affected,  depending upon  whether a  particular Certificate  is purchased  at a
premium or  discount  price, by  a  higher or  lower  than anticipated  rate  of
prepayments  on the related Mortgage Loans.  In particular, the yield on Classes
of Certificates  entitling  the  holders thereof  primarily  or  exclusively  to
payments  of interest or primarily or  exclusively to payments of principal will
be extremely sensitive to the rate of prepayments on the related Mortgage Loans.
In addition, the yield on certain Classes of Certificates may be relatively more
sensitive to  the rate  of prepayment  of specified  Mortgage Loans  than  other
Classes  of Certificates. In particular, prepayments  are influenced by a number
of factors,  including  prevailing mortgage  market  interest rates,  local  and
national  economic conditions and homeowner mobility.  In addition, the yield to
investors may be adversely affected by interest shortfalls which may result from
the timing of the receipt of prepayments or liquidations to the extent that such
interest shortfalls  are  not  covered  by aggregate  Servicing  Fees  or  other
mechanisms  specified  in the  applicable  Prospectus Supplement.  The  yield to
 
                                       14
<PAGE>
investors in Classes of  Certificates will be adversely  affected to the  extent
that  losses on the Mortgage Loans in  the related Trust Estate are allocated to
such Classes  and  may  be  adversely  affected  to  the  extent  of  unadvanced
delinquencies  on the  Mortgage Loans  in the  related Trust  Estate. Classes of
Certificates identified in the applicable Prospectus Supplement as  Subordinated
Certificates  are more  likely to be  affected by delinquencies  and losses than
other Classes of Certificates. See "Prepayment and Yield Considerations."
 
BOOK-ENTRY SYSTEM FOR CERTAIN CLASSES AND SUBCLASSES OF CERTIFICATES
 
    Since transactions in the Classes and Subclasses of Book-Entry  Certificates
of  any Series generally can be effected  only through DTC, DTC Participants and
Indirect  DTC  Participants,  the  ability  of  a  Beneficial  Owner  to  pledge
Book-Entry  Certificates to persons  or entities that do  not participate in the
DTC system, or to  otherwise act with respect  to such Book-Entry  Certificates,
may  be limited due  to the lack  of a physical  certificate for such Book-Entry
Certificates. In  addition, under  a book-entry  format, Beneficial  Owners  may
experience delays in their receipt of payments, since distributions will be made
by  the Master Servicer, or a Paying Agent  on behalf of the Master Servicer, to
Cede, as  nominee for  DTC. 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 Form" herein.
 
                               THE TRUST ESTATES
 
GENERAL
 
    The  Trust Estate for each Series  of Certificates will consist primarily of
Mortgage Loans evidenced by promissory  notes (the "Mortgage Notes") secured  by
mortgages,  deeds  of  trust  or other  instruments  creating  first  liens (the
"Mortgages") on  some or  all of  the following  six types  of property  (as  so
secured,  the "Mortgaged Properties"), to the extent set forth in the applicable
Prospectus  Supplement:  (i)  one-  to  four-family  detached  residences,  (ii)
townhouses,   (iii)   condominium  units,   (iv)   units  within   planned  unit
developments, (v) long-term  leases with respect  to any of  the foregoing,  and
(vi)  shares issued by private  non-profit housing corporations ("cooperatives")
and the related  proprietary leases or  occupancy agreements granting  exclusive
rights to occupy specified units in such cooperatives' buildings. In addition, a
Trust Estate will also include (i) amounts held from time to time in the related
Certificate  Account,  (ii)  the  Seller's  interest  in  any  primary  mortgage
insurance,  hazard  insurance,  title  insurance  or  other  insurance  policies
relating  to  a Mortgage  Loan,  (iii) any  property  which initially  secured a
Mortgage Loan and which  has been acquired by  foreclosure or trustee's sale  or
deed  in lieu of foreclosure  or trustee's sale, (iv)  if applicable, and to the
extent set forth in  the applicable Prospectus Supplement,  any reserve fund  or
funds,  (v)  if  applicable, and  to  the  extent set  forth  in  the applicable
Prospectus Supplement, contractual obligations of any person to make payments in
respect of any form of credit enhancement or any interest subsidy agreement  and
(vi)  such  other  assets  as  may be  specified  in  the  applicable Prospectus
Supplement. The Trust  Estate will not  include the portion  of interest on  the
Mortgage  Loans  which  constitutes  the  Fixed  Retained  Yield,  if  any.  See
"Servicing of the Mortgage Loans -- Fixed Retained Yield, Servicing Compensation
and Payment of Expenses."
 
MORTGAGE LOANS
 
    The Mortgage Loans will have been acquired by the Seller from its affiliate,
Norwest Mortgage.  The  Mortgage Loans  will  have been  originated  by  Norwest
Mortgage or will have been acquired by Norwest Mortgage from other affiliated or
unaffiliated  mortgage  loan  originators.  Each Mortgage  Loan  will  have been
underwritten either to Norwest Mortgage's standards, to the extent specified  in
the  applicable Prospectus Supplement, to the standards  of a Pool Insurer or to
such other standards set forth in the applicable Prospectus Supplement. See "The
Mortgage Loan Programs --  Mortgage Loan Production Sources"  and " --  Mortgage
Loan Underwriting." The Prospectus Supplement for each Series will set forth the
respective number and principal amounts of Mortgage Loans
 
                                       15
<PAGE>
(i)  originated  by Norwest  Mortgage  or its  affiliate  and (ii)  purchased by
Norwest Mortgage or its affiliates  from unaffiliated mortgage loan  originators
through Norwest Mortgage's mortgage loan purchase programs.
 
    Each  of the  Mortgage Loans will  be secured  by a Mortgage  on a Mortgaged
Property located in any of the 50 states or the District of Columbia. Generally,
the land underlying a Mortgaged Property will consist of five acres or less  but
may consist of greater acreage in Norwest Mortgage's discretion.
 
    If specified in the applicable Prospectus Supplement, the Mortgage Loans may
be  secured by leases on real property under circumstances that Norwest Mortgage
determines in its discretion are  commonly acceptable to institutional  mortgage
investors. A Mortgage Loan secured by a lease on real property is secured not by
a  fee simple  interest in the  Mortgaged Property  but rather by  a lease under
which the mortgagor has the right, for a specified term, to use the related real
estate and the residential dwelling located thereon. Generally, a Mortgage  Loan
will  be secured by a lease only if the use of leasehold estates as security for
mortgage loans is customary in the area,  the lease is not subject to any  prior
lien  that could result  in termination of the  lease and the  term of the lease
ends at least five years beyond the maturity date of the related Mortgage  Loan.
The  provisions of each lease securing a Mortgage Loan will expressly permit (i)
mortgaging of the  leasehold estate, (ii)  assignment of the  lease without  the
lessor's consent and (iii) acquisition by the holder of the Mortgage, in its own
or  its  nominee's  name,  of  the rights  of  the  lessee  upon  foreclosure or
assignment in lieu of foreclosure,  unless alternative arrangements provide  the
holder  of the  Mortgage with substantially  similar protections.  No lease will
contain provisions which (i) provide  for termination upon the lessee's  default
without  the holder of the Mortgage being entitled to receive written notice of,
and opportunity to cure, such default, (ii) provide for termination in the event
of damage  or destruction  as long  as the  Mortgage is  in existence  or  (iii)
prohibit  the  holder  of  the  Mortgage from  being  insured  under  the hazard
insurance policy or policies related to the premises.
 
    The Prospectus  Supplement will  set forth  the geographic  distribution  of
Mortgaged  Properties and the number and  aggregate unpaid principal balances of
the Mortgage Loans by category of Mortgaged Property. The Prospectus  Supplement
for  each Series will also set forth the  range of original terms to maturity of
the Mortgage Loans in the Trust  Estate, the weighted average remaining term  to
stated  maturity at the  Cut-Off Date of  such Mortgage Loans,  the earliest and
latest months  of origination  of such  Mortgage Loans,  the range  of  Mortgage
Interest Rates borne by such Mortgage Loans, if such Mortgage Loans have varying
Net  Mortgage Interest Rates, the weighted average Net Mortgage Interest Rate at
the Cut-Off Date of  such Mortgage Loans, the  range of Loan-to-Value Ratios  at
the  time  of origination  of such  Mortgage  Loans and  the range  of principal
balances at origination of such Mortgage Loans.
 
    The information with respect to the Mortgage Loans and Mortgaged  Properties
described  in the  preceding two paragraphs  may be presented  in the Prospectus
Supplement for a Series  as ranges in which  the actual characteristics of  such
Mortgage Loans and Mortgaged Properties are expected to fall. In all such cases,
information  as to the final characteristics of the Mortgage Loans and Mortgaged
Properties will be available in a Current Report on Form 8-K which will be filed
with the  Commission within  15 days  of  the initial  issuance of  the  related
Series.
 
    The  Mortgage Loans in  a Trust Estate will  generally have monthly payments
due on the first of each month (each, a "Due Date") but may, if so specified  in
the  applicable Prospectus Supplement,  have payments due on  a different day of
each month and will be of one of the following types of mortgage loans:
 
    A. FIXED  RATE  LOANS.    If  so  specified  in  the  applicable  Prospectus
Supplement,  a Trust  Estate may  contain fixed-rate,  fully-amortizing mortgage
loans providing for level monthly payments  of principal and interest and  terms
at  origination or modification of  not more than 30  years. If specified in the
applicable Prospectus Supplement, fixed rates  on certain Mortgage Loans may  be
converted  to adjustable rates after origination of such Mortgage Loans and upon
the satisfaction  of other  conditions specified  in the  applicable  Prospectus
Supplement. If so specified in the applicable Prospectus
 
                                       16
<PAGE>
Supplement,  the  Pooling and  Servicing Agreement  will  require the  Seller or
another party to repurchase each such  converted Mortgage Loan at the price  set
forth  in the applicable Prospectus Supplement.  A Trust Estate containing fixed
rate Mortgage Loans may contain convertible Mortgage Loans which have  converted
from  an adjustable interest rate prior to the formation of the Trust Estate and
which are subject to no further conversions.
 
    B. ADJUSTABLE RATE  LOANS.   If so  specified in  the applicable  Prospectus
Supplement, a Trust Estate may contain fully-amortizing adjustable-rate mortgage
loans  having an original or modified term to maturity of not more than 30 years
with a related Mortgage Interest  Rate which generally adjusts initially  either
six  months, one,  three, five,  seven or  ten years  subsequent to  the initial
payment date, and thereafter  at either six-month,  one-year or other  intervals
over  the term of the mortgage loan to equal the sum of a fixed margin set forth
in the related Mortgage Note and an index. The applicable Prospectus  Supplement
will  set forth the relevant index and  the highest, lowest and weighted average
margin with respect to the adjustable  rate mortgage loans in the related  Trust
Estate.  The applicable Prospectus Supplement will also indicate any periodic or
lifetime limitations on changes in  any per annum Mortgage  Rate at the time  of
any adjustment.
 
    If  specified in the  applicable Prospectus Supplement,  adjustable rates on
certain Mortgage Loans may be converted to fixed rates after origination of such
Mortgage Loans and  upon the  satisfaction of  the conditions  specified in  the
applicable  Prospectus  Supplement. If  specified  in the  applicable Prospectus
Supplement, the Seller or another party will generally be required to repurchase
each such  converted Mortgage  Loan at  the price  set forth  in the  applicable
Prospectus  Supplement. A Trust Estate containing adjustable rate Mortgage Loans
may contain  convertible  Mortgage  Loans  which have  converted  from  a  fixed
interest rate prior to the formation of the Trust Estate.
 
    If  so specified in  the applicable Prospectus  Supplement, the Trust Estate
may contain adjustable-rate  mortgage loans which  have Mortgage Interest  Rates
that  generally adjust monthly or may adjust  at other intervals as specified in
the applicable  Prospectus Supplement.  The scheduled  monthly payment  will  be
adjusted  as  and when  described in  the  applicable Prospectus  Supplement (at
intervals different from those at which the Mortgage Interest Rate is  adjusted)
to an amount that would fully amortize the Mortgage Loan over its remaining term
on  a level debt service basis; provided that increases in the scheduled monthly
payment may be  subject to certain  limitations as specified  in the  applicable
Prospectus  Supplement, thereby resulting in negative amortization of principal.
If an adjustment to the  Mortgage Interest Rate on  such a Mortgage Loan  causes
the  amount  of interest  accrued thereon  in  any month  to exceed  the current
scheduled monthly  payment  on  such  mortgage loan,  the  resulting  amount  of
interest  that has accrued but is not then payable ("Deferred Interest") will be
added to the principal balance of such Mortgage Loan.
 
    C. GRADUATED PAYMENT LOANS.   If so specified  in the applicable  Prospectus
Supplement,  a Trust Estate  may contain fixed-rate,  graduated payment mortgage
loans having original or modified  terms to maturity of  not more than 30  years
with  monthly  payments during  the first  year  calculated on  the basis  of an
assumed interest rate which is a specified percentage below the Mortgage Rate on
such mortgage  loan. Such  monthly payments  increase at  the beginning  of  the
second  year  by  a  specified  percentage of  the  monthly  payment  during the
preceding year and  each year specified  thereafter to the  extent necessary  to
amortize the mortgage loan over the remainder of its term. Deferred Interest, if
any, will be added to the principal balance of such mortgage loans.
 
    D.  SUBSIDY LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust Estate may contain Mortgage Loans subject to temporary interest  subsidy
agreements  ("Subsidy Loans") pursuant to which the monthly payments made by the
related mortgagors will  be less  than the  scheduled monthly  payments on  such
Mortgage  Loans with  the present value  of the resulting  difference in payment
("Subsidy Payments") being provided by the employer of the mortgagor,  generally
on  an annual basis.  Subsidy Payments will  generally be placed  in a custodial
account ("Subsidy Account")
 
                                       17
<PAGE>
by the related Servicer. Despite the existence of a subsidy program, a mortgagor
remains primarily liable for making all scheduled payments on a Subsidy Loan and
for all other obligations provided for in the related Mortgage Note and Mortgage
Loan.
 
    Subsidy Loans are offered by employers generally through either a  graduated
or  fixed  subsidy loan  program, or  a  combination thereof.  The terms  of the
subsidy agreements relating  to Subsidy Loans  generally range from  one to  ten
years.  The subsidy agreements relating to  Subsidy Loans made under a graduated
program generally will  provide for  subsidy payments that  result in  effective
subsidized  interest rates between  three percentage points  and five percentage
points below  the Mortgage  Interest  Rates specified  in the  related  Mortgage
Notes.  Generally, under a graduated program, the subsidized rate for a Mortgage
Loan will increase approximately one percentage  point per year until it  equals
the full Mortgage Interest Rate. For example, if the initial subsidized interest
rate is five percentage points below the Mortgage Interest Rate in year one, the
subsidized  rate  will increase  to four  percentage  points below  the Mortgage
Interest Rate in year two, and likewise until year six, when the subsidized rate
will equal the Mortgage Interest Rate. Where the subsidy agreements relating  to
Subsidy  Loans are in effect for longer than five years, the subsidized interest
rates generally increase  at smaller  percentage increments for  each year.  The
subsidy  agreements  relating  to  Subsidy  Loans  made  under  a  fixed program
generally will  provide  for  subsidized interest  rates  at  fixed  percentages
(generally  one percentage  point to two  percentage points)  below the Mortgage
Interest Rates for  specified periods,  generally not  in excess  of ten  years.
Subsidy Loans are also offered pursuant to combination fixed/graduated programs.
The subsidy agreements relating to such Subsidy Loans generally will provide for
an  initial fixed  subsidy of  up to  five percentage  points below  the related
Mortgage Interest Rate for up  to five years, and  then a periodic reduction  in
the  subsidy for up to  five years, at an equal  fixed percentage per year until
the subsidized rate equals the Mortgage Interest Rate.
 
    Generally, employers may terminate subsidy programs in the event of (i)  the
mortgagor's  death, retirement,  resignation or termination  of employment, (ii)
the full prepayment  of the Subsidy  Loan by  the mortgagor, (iii)  the sale  or
transfer by the mortgagor of the related Mortgaged Property as a result of which
the  mortgagee  is  entitled to  accelerate  the  Subsidy Loan  pursuant  to the
"due-on-sale" clause  contained in  the Mortgage,  or (iv)  the commencement  of
foreclosure  proceedings or the acceptance of a  deed in lieu of foreclosure. In
addition, some  subsidy programs  provide  that if  prevailing market  rates  of
interest  on mortgage loans similar to a Subsidy Loan are less than the Mortgage
Interest Rate of such Subsidy Loan, the employer may request that the  mortgagor
refinance  such Subsidy Loan and may  terminate the related subsidy agreement if
the mortgagor fails to refinance such  Subsidy Loan. In the event the  mortgagor
refinances  such Subsidy Loan,  the new loan  will not be  included in the Trust
Estate. See "Prepayment and Yield Considerations" herein. In the event a subsidy
agreement is terminated,  the amount remaining  in the Subsidy  Account will  be
returned  to the employer, and the mortgagor  will be obligated to make the full
amount of  all remaining  scheduled payments,  if any.  The mortgagor's  reduced
monthly  housing expense as a consequence  of payments under a subsidy agreement
is used  by Norwest  Mortgage in  determining certain  expense-to-income  ratios
utilized  in underwriting  a Subsidy  Loan. See  "The Mortgage  Loan Programs --
Mortgage Loan Underwriting."
 
    E. BUY-DOWN LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust Estate may  contain Mortgage Loans subject  to temporary buy-down  plans
("Buy-Down  Loans") pursuant to which the monthly payments made by the mortgagor
during the early  years of the  Mortgage Loan  will be less  than the  scheduled
monthly  payments on the Mortgage Loan. The resulting difference in payment will
be compensated  for from  an amount  contributed by  the seller  of the  related
Mortgaged  Property or another source, including  the originator of the Mortgage
Loan (generally on a present value basis) and, if so specified in the applicable
Prospectus Supplement, placed in  a custodial account  (the "Buy-Down Fund")  by
the  related Servicer. If the mortgagor on a Buy-Down Loan prepays such Mortgage
Loan in  its entirety,  or defaults  on  such Mortgage  Loan and  the  Mortgaged
Property is sold in liquidation thereof, during the period when the mortgagor is
not obligated, on account of the buy-
 
                                       18
<PAGE>
down  plan, to  pay the  full monthly  payment otherwise  due on  such loan, the
unpaid principal balance of  such Buy-Down Loan will  be reduced by the  amounts
remaining  in the  Buy-Down Fund  with respect to  such Buy-Down  Loan, and such
amounts will be deposited in the  Servicer Custodial Account or the  Certificate
Account,  net of  any amounts  paid with  respect to  such Buy-Down  Loan by any
insurer, guarantor or other person pursuant to a credit enhancement  arrangement
described in the applicable Prospectus Supplement.
 
    F.  BALLOON LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust  Estate may  include Mortgage  Loans which  are amortized  over a  fixed
period  not exceeding 30  years but which  have shorter terms  to maturity (each
such Mortgage  Loan, a  "Balloon Loan")  that causes  the outstanding  principal
balance  of the  related Mortgage Loan  to be  due and payable  at the  end of a
certain specified period (the  "Balloon Period"). The  borrower of such  Balloon
Loan  will be obligated to  pay the entire outstanding  principal balance of the
Balloon Loan at  the end of  the related  Balloon Period. In  the event  Norwest
Mortgage  refinances a mortgagor's  Balloon Loan at maturity,  the new loan will
not be included in the Trust  Estate. See "Prepayment and Yield  Considerations"
herein.
 
    A  Trust  Estate may  also include  other types  of first  lien, residential
Mortgage Loans to the extent set forth in the applicable Prospectus Supplement.
 
                                   THE SELLER
 
    Norwest Asset Securities Corporation (the "Seller" or "NASCOR") is a direct,
wholly owned subsidiary of Norwest Mortgage, Inc. and an indirect, wholly  owned
subsidiary  of Norwest  Corporation, a corporation  organized under  the laws of
Delaware ("Norwest Corporation"). The  Seller was incorporated  in the State  of
Delaware on March 28, 1996.
 
    The limited purposes of the Seller are, in general, to acquire, own and sell
mortgage  loans; to  issue, acquire,  own, hold  and sell  mortgage pass-through
securities which represent  ownership interests in  mortgage loans,  collections
thereon  and related properties; and to engage  in any acts which are incidental
to, or necessary, suitable or convenient to accomplish, the foregoing.
 
    The Seller maintains its principal office at 5325 Spectrum Drive, Frederick,
Maryland 21701. Its telephone number is (301) 846-8881.
 
    At the time of  the formation of  any Trust Estate, the  Seller will be  the
sole  owner of all the related Mortgage Loans. The Seller will have acquired the
Mortgage Loans included in any Trust Estate from Norwest Mortgage. Except to the
extent otherwise specified in the applicable Prospectus Supplement, the Seller's
only obligation  with respect  to the  Certificates  of any  Series will  be  to
repurchase  or substitute for Mortgage  Loans in a Trust  Estate in the event of
defective documentation  or  upon  the breach  of  certain  representations  and
warranties  made  by the  Seller. See  "The Pooling  and Servicing  Agreement --
Assignment of Mortgage Loans to the Trustee."
 
                                NORWEST MORTGAGE
 
    Norwest Mortgage, Inc. ("Norwest Mortgage") was originally incorporated as a
Minnesota corporation on July 1, 1983. On August 30, 1995, Norwest Mortgage  and
Directors  Mortgage  Loan  Corporation, a  California  corporation,  completed a
statutory merger.  As  a result  of  the  merger, Norwest  became  a  California
corporation  as of September 1, 1995. Norwest Mortgage is engaged principally in
the business of (i) originating and purchasing residential mortgage loans in its
own name and through its affiliates,  Norwest Funding, Inc. and Norwest  Funding
II,  Inc.  (collectively,  "Norwest  Funding")  and  (ii)  servicing residential
mortgage loans  for  its own  account  or for  the  account of  others.  Norwest
Mortgage  is a  direct, wholly  owned subsidiary  of Norwest  Nova, Inc.  and an
indirect, wholly owned subsidiary of Norwest Corporation. The executive  offices
of  Norwest Mortgage are located  at 405 Southwest 5th  Street, Des Moines, Iowa
50309-4603, and its telephone number is (515) 221-7300.
 
    On May 7,  1996 Norwest  Mortgage and Norwest  Funding acquired  all of  the
mortgage  origination,  servicing  and  secondary  marketing  operations  of The
Prudential Home Mortgage Company, Inc.
 
                                       19
<PAGE>
("PHMC"), an  indirect,  wholly owned  subsidiary  of The  Prudential  Insurance
Company  of  America,  and purchased  certain  mortgage  loans from  PHMC  and a
substantial portion of  PHMC's mortgage servicing  portfolio (such  transaction,
the  "PHMC  Acquisition").  The  Mortgage Loans  included  in  any  Trust Estate
underlying a Series of Certificates may consist of (i) Mortgage Loans originated
by Norwest  Mortgage or  Norwest Funding  or purchased  by Norwest  Mortgage  or
Norwest  Funding from  originators other  than PHMC  ("Norwest Mortgage Loans"),
(ii) Mortgage Loans  originated or  purchased by  PHMC and  acquired by  Norwest
Mortgage  or Norwest Funding  from PHMC as  part of the  PHMC Acquisition ("PHMC
Mortgage Loans")  or (iii)  a combination  of Norwest  Mortgage Loans  and  PHMC
Mortgage Loans.
 
    Norwest  Mortgage is an approved servicer  of FNMA, FHLMC and the Government
National Mortgage Association. As of December  31, 1995, Norwest Mortgage had  a
net worth of approximately $314.8 million.
 
                                  NORWEST BANK
 
    Norwest  Bank Minnesota, National  Association ("Norwest Bank")  will act as
Master Servicer with respect  to each Series. Norwest  Bank is a direct,  wholly
owned  subsidiary of  Norwest Corporation.  Norwest Bank  is a  national banking
association originally  chartered in  1872 and  is engaged  in a  wide range  of
activities typical of a national bank.
 
    Norwest  Bank's principal  office is  located at  Norwest Center,  Sixth and
Marquette, Minneapolis,  Minnesota  55479.  Norwest  Bank  conducts  its  master
servicing  and securities  administration services  at its  offices in Columbia,
Maryland. Its address  there is  11000 Broken Land  Parkway, Columbia,  Maryland
21044-3662 and its telephone number is (410) 884-2000.
 
                           THE MORTGAGE LOAN PROGRAMS
 
MORTGAGE LOAN PRODUCTION SOURCES
 
    Norwest  Mortgage  conducts  a  significant  portion  of  its  mortgage loan
originations through more than 700  loan production offices (the "Loan  Stores")
located  throughout all 50 states. Norwest  Mortgage also conducts a significant
portion of its mortgage loan originations through centralized production offices
located  in  Springfield,   Illinois,  Frederick,   Maryland  and   Minneapolis,
Minnesota.  At the latter locations,  Norwest Mortgage receives applications for
home mortgage  loans on  toll-free telephone  numbers that  can be  called  from
anywhere in the United States.
 
    The  following  are  Norwest  Mortgage's primary  sources  of  mortgage loan
originations: (i) direct contact with prospective borrowers (including borrowers
with mortgage loans currently serviced by Norwest Mortgage or borrowers referred
by borrowers with mortgage loans  currently serviced by Norwest Mortgage),  (ii)
referrals by realtors, other real estate professionals and prospective borrowers
to  the  Loan  Stores, (iii)  referrals  from selected  corporate  clients, (iv)
referrals from  the  private  mortgage  banking group,  a  division  of  Norwest
Funding,  Inc.,  which specializes  in  mortgage loans  with  original principal
balances in excess of the limits of  FNMA and FHLMC, (v) several joint  ventures
into  which  Norwest  Mortgage,  through its  wholly  owned  subsidiary, Norwest
Mortgage Ventures, Inc., has entered with realtors and banking institutions (the
"Joint Ventures") and (vi) referrals from mortgage brokers and similar entities.
In addition to  its own  mortgage loan originations,  Norwest Mortgage  acquires
qualifying mortgage loans from other unaffiliated originators
("Correspondents").  See " -- Acquisition of Mortgage Loans from Correspondents"
below. The relative contribution of each of these sources to Norwest  Mortgage's
business,  measured by  the volume of  loans generated, tends  to fluctuate over
time.
 
    Norwest Mortgage Ventures, Inc. owns at least a 50% interest in each of  the
Joint  Ventures, with the remaining ownership interest  in each being owned by a
realtor or  a  banking institution  having  significant contact  with  potential
borrowers. Mortgage loans that are originated by Joint Ventures in which Norwest
Mortgage's  partners are realtors are generally  made to finance the acquisition
of
 
                                       20
<PAGE>
properties marketed by  such Joint Venture  partners. Applications for  mortgage
loans  originated through  Joint Ventures are  generally taken  by Joint Venture
employees and underwritten by Norwest  Mortgage in accordance with its  standard
underwriting criteria. Such mortgage loans are then closed by the Joint Ventures
in  their own  names and subsequently  purchased by Norwest  Mortgage or Norwest
Funding.
 
    Norwest Mortgage  may  directly  contact  prospective  borrowers  (including
borrowers  with mortgage loans  currently serviced by  Norwest Mortgage) through
general and targeted solicitations. Such  solicitations are made through  direct
mailings,  mortgage  loan  statement  inserts and  television,  radio  and print
advertisements and by telephone.  Norwest Mortgage's targeted solicitations  may
be  based on characteristics such as  the borrower's mortgage loan interest rate
or payment history and  the geographic location of  the mortgaged property.  See
"Prepayment and Yield Considerations" herein.
 
    A  majority  of  Norwest  Mortgage's corporate  clients  are  companies that
sponsor relocation programs  for their  employees and in  connection with  which
Norwest  Mortgage provides mortgage financing. Eligibility for a relocation loan
is based, in  general, on an  employer's providing financial  assistance to  the
relocating  employee in  connection with  a job-required  move. Although Subsidy
Loans are  typically generated  through such  corporate-sponsored programs,  the
assistance extended by the employer need not necessarily take the form of a loan
subsidy.  (Not all  relocation loans are  generated by  Norwest Mortgage through
referrals from its corporate clients; some  relocation loans are generated as  a
result  of referrals from  mortgage brokers and similar  entities and others are
generated through Norwest  Mortgage's acquisition of  mortgage loans from  other
originators.)  Also  among  Norwest  Mortgage's  corporate  clients  are various
professional associations. These  associations, as well  as the other  corporate
clients,  promote the availability of a broad range of Norwest Mortgage mortgage
products to their members or  employees, including refinance loans,  second-home
loans and investment-property loans.
 
ACQUISITION OF MORTGAGE LOANS FROM CORRESPONDENTS
 
    In  order to qualify  for participation in  Norwest Mortgage's mortgage loan
purchase programs, lending institutions must  (i) meet and maintain certain  net
worth  and other financial standards, (ii) demonstrate experience in originating
residential  mortgage  loans,  (iii)  meet  and  maintain  certain   operational
standards,  (iv) evaluate each loan offered  to Norwest Mortgage for consistency
with Norwest  Mortgage's underwriting  guidelines  or the  standards of  a  Pool
Insurer and represent that each loan was underwritten in accordance with Norwest
Mortgage  standards  or the  standards of  a  Pool Insurer  and (v)  utilize the
services of qualified appraisers.
 
    The contractual arrangements with Correspondents may involve the  commitment
by  Norwest Mortgage to accept  delivery of a certain  dollar amount of mortgage
loans over a period of time; this commitment may be satisfied either by delivery
of mortgage  loans  one  at  a  time  or  in  multiples  as  aggregated  by  the
Correspondent. The contractual arrangements with Correspondents may also involve
the  delegation of all underwriting functions to such Correspondents ("Delegated
Underwriting"), which  will  result  in  Norwest  Mortgage  not  performing  any
underwriting  functions prior to acquisition of  the loan but instead relying on
such originators' representations, and Norwest Mortgage's post-purchase  reviews
of  samplings of  mortgage loans  acquired from  such originators  regarding the
originators' compliance with Norwest  Mortgage's underwriting standards. In  all
instances,  however, acceptance by Norwest Mortgage is contingent upon the loans
being found to satisfy Norwest Mortgage's program standards or the standards  of
a  Pool Insurer. Norwest Mortgage may  also acquire portfolios of seasoned loans
in negotiated transactions.
 
MORTGAGE LOAN UNDERWRITING
 
    NORWEST MORTGAGE UNDERWRITING.   Norwest  Mortgage's underwriting  standards
are  applied by  or on  behalf of Norwest  Mortgage to  evaluate the applicant's
credit standing and ability to repay the loan, as well as the value and adequacy
of the mortgaged property as  collateral. The underwriting standards that  guide
the  determination represent a balancing of  several factors that may affect the
ultimate recovery of the loan amount, including, among others, the amount of the
loan, the ratio of the
 
                                       21
<PAGE>
loan amount to the property value (i.e., the lower of the appraised value of the
mortgaged property and the purchase price), the borrower's means of support  and
the  borrower's credit  history. Norwest Mortgage's  guidelines for underwriting
may vary according  to the nature  of the borrower  or the type  of loan,  since
differing  characteristics may  be perceived  as presenting  different levels of
risk. With respect to certain Mortgage Loans, the originators of such loans  may
have  contracted  with unaffiliated  third parties  to perform  the underwriting
process. Except as described  below, Mortgage Loans were  underwritten by or  on
behalf  of  Norwest Mortgage  or,  in the  case  of PHMC  Mortgage  Loans, PHMC,
generally in accordance with the standards and procedures described herein.
 
    Norwest Mortgage utilizes  various systems of  credit scoring as  a tool  to
supplement  the  mortgage  loan  underwriting  process.  Credit  scoring assists
Norwest Mortgage in the mortgage loan approval process by providing  consistent,
objective  measures  of  borrower  credit and  loan  attributes.  Such objective
measures are used to  evaluate loan applications and  assign each application  a
"Credit  Score." The Credit Score is used  to determine the type of underwriting
process  and  which  level  of  underwriter  will  review  the  loan  file.  For
transactions  which are determined  to be low-risk  transactions, based upon the
Credit Score  and  other  parameters (including  the  mortgage  loan  production
source),  the lowest underwriting authority  is generally required. For moderate
and higher risk transactions, higher level underwriters and a full review of the
mortgage file are generally required.  Borrowers who have a satisfactory  Credit
Score  (based upon the mortgage loan production source) are generally subject to
streamlined credit  review  (which relies  on  the credit  scoring  process  for
various  elements of the  underwriting assessments). Such  borrowers may also be
eligible for  a limited  documentation  program and  are generally  permitted  a
greater latitude in the application of borrower debt-to-income ratios.
 
    With respect to all mortgage loans underwritten by Norwest Mortgage, Norwest
Mortgage's  underwriting of  a mortgage  loan may be  based on  data obtained by
parties other than Norwest Mortgage that  are involved at various stages in  the
mortgage  origination  or  acquisition  process.  This  typically  occurs  under
circumstances in which loans are subject  to more than one approval process,  as
when correspondents, certain mortgage brokers or similar entities that have been
approved  by Norwest  Mortgage to  process loans  on its  behalf, or independent
contractors hired by Norwest  Mortgage to perform  underwriting services on  its
behalf   ("contract  underwriters")  make  initial   determinations  as  to  the
consistency  of  loans  with  Norwest  Mortgage  underwriting  guidelines.   The
underwriting  of  mortgage  loans acquired  by  Norwest Mortgage  pursuant  to a
Delegated Underwriting arrangement with a Correspondent is not reviewed prior to
acquisition of the mortgage loan by Norwest Mortgage although the mortgage  loan
file  is  reviewed by  Norwest Mortgage  to confirm  that certain  documents are
included  in   the  file.   Instead,  Norwest   Mortgage  relies   on  (i)   the
Correspondent's  representations  that such  mortgage  loan was  underwritten in
accordance  with   Norwest  Mortgage's   underwriting  standards   and  (ii)   a
post-purchase  review of  a sampling  of all  mortgage loans  acquired from such
originator. In  addition, in  order to  be eligible  to sell  mortgage loans  to
Norwest   Mortgage  pursuant  to  a   Delegated  Underwriting  arrangement,  the
originator must meet certain requirements including, among other things, certain
quality, operational and financial guidelines.
 
    A prospective borrower applying for a mortgage loan is required to  complete
a detailed application. The loan application elicits pertinent information about
the  applicant,  with particular  emphasis on  the applicant's  financial health
(assets, liabilities, income and expenses), the property being financed and  the
type of loan desired. A self-employed applicant may be required to submit his or
her  most  recent  signed federal  income  tax  returns. With  respect  to every
applicant, credit  reports  are  obtained from  commercial  reporting  services,
summarizing   the  applicant's  credit  history   with  merchants  and  lenders.
Significant unfavorable credit information reported by the applicant or a credit
reporting agency must be explained by  the applicant. The credit review  process
generally is streamlined for borrowers with a qualifying Credit Score.
 
    Verifications  of employment,  income, assets  or mortgages  may be  used to
supplement  the  loan  application   and  the  credit   report  in  reaching   a
determination  as  to  the  applicant's  ability  to  meet  his  or  her monthly
obligations on the proposed mortgage loan, as well as his or her other  mortgage
 
                                       22
<PAGE>
payments  (if  any),  living  expenses  and  financial  obligations.  A mortgage
verification involves  obtaining information  regarding the  borrower's  payment
history  with  respect to  any existing  mortgage the  applicant may  have. This
verification is  accomplished by  either having  the present  lender complete  a
verification  of mortgage form, evaluating the  information on the credit report
concerning  the  applicant's   payment  history  for   the  existing   mortgage,
communicating,  either  verbally or  in  writing, with  the  applicant's present
lender or analyzing cancelled checks provided by the applicant. Verifications of
income, assets or  mortgages may  be waived  under certain  programs offered  by
Norwest  Mortgage, but  Norwest Mortgage's  underwriting guidelines  require, in
most instances, a verbal or written  verification of employment to be  obtained.
In  some cases,  employment histories may  be obtained through  V.I.E., Inc., an
affiliate  of  Norwest  Mortgage,  that  obtains  employment  data  from   state
unemployment  insurance departments  or other  state agencies.  In addition, the
loan applicant may be  eligible for a loan  approval process permitting  limited
documentation.  The above  referenced reduced documentation  options and waivers
limit the amount of documentation required for an underwriting decision and have
the effect of increasing  the relative importance of  the credit report and  the
appraisal.  Documentation  requirements vary  based  upon a  number  of factors,
including the purpose of the loan, the amount of the loan, the ratio of the loan
amount to the property  value and the mortgage  loan production source.  Norwest
Mortgage  accepts alternative methods of  verification, in those instances where
verifications are  part  of the  underwriting  decision; for  example,  salaried
income may be substantiated either by means of a form independently prepared and
signed  by the applicant's employer  or by means of  the applicant's most recent
paystub and W-2. In cases where two  or more persons have jointly applied for  a
mortgage  loan,  the  gross  incomes  and expenses  of  all  of  the applicants,
including nonoccupant co-mortgagors, are combined and considered as a unit.
 
    In general, except  for borrowers  meeting certain standards  who apply  for
loans   with  certain   qualifying  characteristics   under  Norwest  Mortgage's
"retention program" applicable to then-current borrowers, borrowers applying for
loans must demonstrate  that the ratio  of their total  monthly housing debt  to
their  monthly gross income, and the ratio  of their total monthly debt to their
monthly gross income do not exceed  certain maximum levels. Such maximum  levels
vary,  and under  the "retention  program" may  not be  applied, depending  on a
number of factors including Loan-to-Value Ratio, a borrower's credit history,  a
borrower's  liquid  net  worth,  the  potential  of  a  borrower  for  continued
employment advancement  or  income  growth,  the  ability  of  the  borrower  to
accumulate  assets or to devote a greater  portion of income to basic needs such
as housing expense, a borrower's Credit Score and the type of loan for which the
borrower is applying. These calculations are based on the amortization  schedule
and the interest rate of the related loan, with each ratio being computed on the
basis  of the proposed monthly mortgage  payment. In the case of adjustable-rate
mortgage loans,  the  interest rate  used  to determine  a  mortgagor's  monthly
payment  for  purposes of  such ratios  may,  in certain  cases, be  the initial
mortgage interest rate or another interest rate, which, in either case, is lower
than the sum of the  index rate that would  have been applicable at  origination
plus  the applicable  margin. In evaluating  applications for  Subsidy Loans and
Buy-Down Loans, such ratios are determined by including in the applicant's total
monthly housing expense  and total  monthly debt the  proposed monthly  mortgage
payment  reduced by the amount  expected to be applied  on a monthly basis under
the related subsidy agreement  or buy-down agreement or,  in certain cases,  the
mortgage payment that would result from an interest rate lower than the Mortgage
Interest Rate but higher than the effective rate to the mortgagor as a result of
the  subsidy  agreement or  the buy-down  agreement. See  "The Trust  Estates --
Mortgage Loans."  Secondary  financing  is permitted  on  mortgage  loans  under
certain  circumstances.  In  those  cases, the  payment  obligations  under both
primary and secondary financing are included  in the computation of the  housing
debt-to-income  ratios, and the  combined amount of  primary and secondary loans
will be  used  to calculate  the  combined loan-to-value  ratio.  Any  secondary
financing  permitted will  generally mature  prior to  the maturity  date of the
related  mortgage  loan.  In  evaluating  an  application  with  respect  to   a
"non-owner-occupied"  property,  which Norwest  Mortgage  defines as  a property
leased to a third party  by its owner (as distinct  from a "second home,"  which
Norwest  Mortgage defines as an owner-occupied,  non-rental property that is not
the owner's principal residence), Norwest Mortgage will include projected rental
income net of
 
                                       23
<PAGE>
certain mortgagor  obligations and  other  assumed expenses  or loss  from  such
property to be included in the applicant's monthly gross income or total monthly
debt  in calculating the foregoing ratios. A  mortgage loan secured by a two- to
four-family Mortgaged Property is considered to be an owner-occupied property if
the borrower occupies  one of the  units; rental  income on the  other units  is
generally  taken into account in evaluating  the borrower's ability to repay the
mortgage loan.
 
    Mortgage Loans will not  generally have had  at origination a  Loan-to-Value
Ratio  in excess of 95%.  However, if so specified  in the applicable Prospectus
Supplement, Mortgage  Loans  that had  Loan-to-Value  Ratios at  origination  in
excess  of 95% may  be included in  the related Trust  Estate. The Loan-to-Value
Ratio is the ratio, expressed  as a percentage, of  the principal amount of  the
Mortgage  Loan at origination  to the lesser  of (i) the  appraised value of the
related Mortgaged  Property, as  established  by an  appraisal obtained  by  the
originator  generally no  more than four  months prior to  origination (or, with
respect to newly  constructed properties, no  more than twelve  months prior  to
origination),  or (ii) the sale price for  such property. In some instances, the
Loan-to-Value Ratio  may be  based on  an  appraisal that  was obtained  by  the
originator  more  than four  months prior  to origination,  provided that  (i) a
recertification of  the original  appraisal is  obtained and  (ii) the  original
appraisal  was obtained no more than twelve months prior to origination. For the
purpose of calculating the Loan-to-Value Ratio of any Mortgage Loan that is  the
result  of  the  refinancing  (including a  refinancing  for  "equity  take out"
purposes) of  an existing  mortgage loan,  the appraised  value of  the  related
Mortgaged Property is generally determined by reference to an appraisal obtained
in  connection with the origination of  the replacement loan. In connection with
certain  of  its  mortgage  originations,  Norwest  Mortgage  currently  obtains
appraisals  through its affiliate, Value Information Technology, Inc. Appraisals
used in connection  with the origination  of the PHMC  Mortgage Loans  generally
were obtained by PHMC through its affiliate, Lender's Service, Inc.
 
    No  assurance  can be  given that  values of  the Mortgaged  Properties have
remained or will remain at  the levels which existed  on the dates of  appraisal
(or,  where applicable, recertification of value) of the related Mortgage Loans.
The appraisal  of any  Mortgaged Property  reflects the  individual  appraiser's
judgment as to value, based on the market values of comparable homes sold within
the  recent past in comparable nearby locations and on the estimated replacement
cost. The appraisal relates both  to the land and to  the structure; in fact,  a
significant  portion  of the  appraised  value of  a  Mortgaged Property  may be
attributable to the value of the land  rather than to the residence. Because  of
the  unique  locations and  special  features of  certain  Mortgaged Properties,
identifying comparable  properties in  nearby locations  may be  difficult.  The
appraised  values of such Mortgaged Properties will be based to a greater extent
on adjustments made  by the  appraisers to  the appraised  values of  reasonably
similar  properties  rather  than  on  objectively  verifiable  sales  data.  If
residential real  estate  values generally  or  in particular  geographic  areas
decline  such  that  the outstanding  balances  of  the Mortgage  Loans  and any
secondary financing on  the Mortgaged  Properties in a  particular Trust  Estate
become  equal to or greater than the values of the related Mortgaged Properties,
the actual rates of delinquencies, foreclosures and losses could be higher  than
those  now generally experienced in the  mortgage lending industry and those now
experienced in  Norwest Mortgage's  servicing portfolios.  In addition,  adverse
economic  conditions generally, in particular geographic areas or industries, or
affecting particular segments  of the  borrowing community  (such as  mortgagors
relying  on commission  income and  self-employed mortgagors)  and other factors
which may or  may not affect  real property values,  including the purposes  for
which the Mortgage Loans were made and the uses of the Mortgaged Properties, may
affect  the timely payment by mortgagors  of scheduled payments of principal and
interest  on  the  Mortgage  Loans   and,  accordingly,  the  actual  rates   of
delinquencies,  foreclosures and  losses with respect  to any  Trust Estate. See
"Prepayment and Yield Considerations --  Weighted Average Life of  Certificates"
herein.  To the extent that such losses are not covered by the methods of credit
support or  the insurance  policies  described herein,  they  will be  borne  by
holders  of the  Certificates of the  Series evidencing interests  in such Trust
Estate.
 
    In  general,  Norwest  Mortgage  does  not  originate  mortgage  loans  with
Loan-to-Value  Ratios  in excess  of 80%  unless  primary mortgage  insurance is
obtained. Loans with Loan-to-Value Ratios
 
                                       24
<PAGE>
exceeding 80% may be approved if primary mortgage insurance is obtained from  an
approved  primary mortgage insurance company. In such cases, the excess over 75%
(or such lower percentage as Norwest  Mortgage may require at origination)  will
be  covered by primary mortgage insurance  until the unpaid principal balance of
the Mortgage Loan is reduced  to an amount that  will result in a  Loan-to-Value
Ratio  less  than or  equal to  80%. With  respect to  the PHMC  Mortgage Loans,
however, PHMC in certain instances did not require primary mortgage insurance on
loans that had Loan-to-Value Ratios exceeding 80%. Primary residences and second
homes (excluding cooperatives) were eligible  for this program. Each  qualifying
loan  was made at an interest rate that was higher than the rate would have been
if the Loan-to-Value Ratio was 80% or less or if primary mortgage insurance  was
obtained.
 
    Except  as described below,  Mortgage Loans will generally  be covered by an
appropriate  standard  form  American  Land  Title  Association  ("ALTA")  title
insurance  policy,  or  a  substantially similar  policy  or  form  of insurance
acceptable to the Federal National Mortgage Association ("FNMA") or the  Federal
Home  Loan  Mortgage  Corporation  ("FHLMC").  Certain  Mortgage  Loans ("T.O.P.
Loans") originated by Norwest Mortgage or Norwest Funding in connection with the
"Title Option  Plus"  program  are  not covered  by  title  insurance  policies,
although  title searches  are performed  in connection  with the  origination of
T.O.P. Loans  by American  Land Title  Company, Inc.,  an affiliate  of  Norwest
Mortgage.  The Seller  will represent  and warrant to  the Trustee  of any Trust
Estate that the Mortgaged Property related to each Mortgage Loan (including each
T.O.P. Loan) is  free and clear  of all encumbrances  and liens having  priority
over  the  first  lien  of  the related  Mortgage,  subject  to  certain limited
exceptions as set forth below under "-- Representations and Warranties." However
in the event that a lien senior to the lien of the Mortgage related to a  T.O.P.
Loan that is contained in the Trust Estate for any Series is found to exist, the
sole  recourse  of the  Trustee will  be against  the Seller  for breach  of its
representation and  warranty. The  Trustee will  not have  recourse against  any
title insurance company or other party.
 
    Where  permitted by law, Norwest Mortgage generally requires that a borrower
include in each monthly payment a portion of the real estate taxes, assessments,
primary mortgage insurance  (if applicable), and  hazard insurance premiums  and
other  similar items with respect to the related mortgage loan. Norwest Mortgage
may, however,  on a  case-by-case  basis, in  its  discretion not  require  such
advance  payments  for certain  Mortgage Loans,  based on  an evaluation  of the
borrowers' ability to pay such taxes and charges as they become due.
 
    POOL CERTIFICATION UNDERWRITING.  If specified in the applicable  Prospectus
Supplement,  certain of  the Mortgage Loans  will have been  reviewed by General
Electric Mortgage Insurance Corporation ("GEMICO"), United Guaranty  Residential
Insurance  Company  ("UGRIC")  or  a  similar  entity  (collectively,  the "Pool
Insurers") to  determine  conformity,  in the  aggregate,  with  such  company's
respective  credit, appraisal and underwriting guidelines. Norwest Mortgage will
not have  underwritten  such  Mortgage  Loans. Neither  GEMICO  nor  UGRIC  have
underwritten  any  of  the  Mortgage  Loans  for  compliance  with  any investor
guidelines.
 
    Based on information  provided by the  relevant company, as  a condition  to
eligibility of a Mortgage Loan for inclusion in a mortgage pool to be insured by
GEMICO  or UGRIC, the loan originator generally  will be required to comply with
the following procedures, although exceptions may  be made if permitted by  such
company.
 
    Initially,  a  prospective borrower  must  fill out  a  detailed application
providing pertinent credit  information. The  loan originator  obtains a  credit
report,   which  summarizes  the  prospective  borrower's  credit  history  with
merchants and lenders  and any record  of bankruptcy, or  other pertinent  legal
history.  In addition, a  verification of employment  for the last  two years is
made from either the applicant's employer or a Form W-2 for the most recent  two
years   and  the  applicant's   most  recent  pay  stub.   If  an  applicant  is
self-employed, such  applicant submits  copies of  signed tax  returns with  all
schedules  for the prior  two years together with  a current year-to-date profit
and loss statement and any  other documentation deemed necessary. Rental  income
used  to qualify the applicant is verified  either by lease agreements or by the
borrower's   tax   returns.   In   the   case   of   refinancings,   the    loan
 
                                       25
<PAGE>
originator  must require, among other things, that  there has not been more than
one delinquency  in the  prior 12  months nor,  in the  case of  mortgage  loans
reviewed  by GEMICO, any delinquency  in the past 90  days on the prior mortgage
loan.
 
    In determining  the adequacy  of the  Mortgaged Property  as collateral,  an
independent  appraisal must be  made of each  property considered for financing.
Each appraiser  must be  selected in  accordance with  predetermined  guidelines
established  for appraisers. 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 market value  of comparable homes. No
appraisal more than six months old will  be accepted by GEMICO and no  appraisal
more than 120 days old will be accepted by UGRIC.
 
    Once all applicable employment, credit and property information is received,
a  determination must be made by the loan originator (and confirmed on review by
GEMICO or UGRIC) as to whether  the prospective borrower has sufficient  monthly
income to meet (i) the monthly payment obligations on the proposed mortgage loan
(including  principal and interest payments, real estate taxes, insurance on the
subject property, and homeowners' association  dues and secondary financing,  if
any),  and  (ii)  the  aggregate  of  the  foregoing  and  all  other  financial
obligations not expected  to be fully  repaid within  the next 10  months. As  a
general  rule, GEMICO  and UGRIC require  the ratio of  a prospective borrower's
debt, as described in clauses (i) and  (ii) above, to such borrower's income  to
be  33% and 38%,  respectively for fixed  rate, fixed payment  loans. The ratios
required for adjustable rate loans are  slightly lower. The general rule may  be
varied,  and higher debt-to-income ratios may be permitted, in appropriate cases
characterized by lower Loan-to-Value Ratios or other favorable factors.
 
    In some  special  cases, GEMICO  and  UGRIC  may underwrite  loans  under  a
"limited   documentation"  program.   With  respect   to  such   loans,  limited
investigation  into  the  borrower's  credit  history  and  income  profile   is
undertaken by the originator and such loans may be underwritten primarily on the
basis  of  an appraisal  of the  mortgaged property  and Loan-to-Value  Ratio on
origination. Thus,  if  the Loan-to-Value  Ratio  is less  than  the  percentage
required under standard guidelines, the originator may forego certain aspects of
the  review  relating to  monthly income,  and,  in the  case of  mortgage loans
reviewed by GEMICO,  traditional ratios of  monthly or total  expenses to  gross
income  may not be applied.  At a minimum, a  limited documentation program must
require a  loan  application,  a  credit  report,  an  appraisal  acceptable  to
FNMA/FHLMC  performed  by  an  independent  appraiser,  and  a  verification  of
downpayment or three months of bank statements. The maximum Loan-to-Value  Ratio
allowed under any limited documentation program underwritten by GEMICO and UGRIC
is  70%.  UGRIC's  "limited  documentation" program  is  limited  exclusively to
self-employed borrowers.
 
    For any rate  or term  refinance of  a mortgage  loan, or  conversion of  an
adjustable  rate mortgage  loan, where GEMICO  or UGRIC has  already insured the
prior loan, GEMICO or  UGRIC may have determined  a loan's insurability  without
reviewing  updated credit  or collateral  information. In  the case  of seasoned
loans, GEMICO or UGRIC may have determined a loan's insurability by performing a
more limited credit and collateral review.
 
    The foregoing should not be taken as  a full and complete discussion of  all
of  the procedures undertaken in connection with a particular underwriting. Both
GEMICO and UGRIC consider various other  factors including, but not limited  to,
reviewing  sales contracts,  verifying deposits  and other  assets and examining
additional supporting documentation in certain instances such as divorce decrees
and  separation  agreements.  Investors  should  consult  the  particular   Pool
Insurer's  underwriting guidelines  for more specific  and complete requirements
regarding underwriting standards.  Furthermore, the  underwriting process  often
results in certain compensating factors being considered to offset the existence
of other negative factors in a loan file.
 
    The  use of  pool certification  underwriting by  a Pool  Insurer in  no way
indicates that  the  related  Certificates  or Mortgage  Loans  are  insured  or
guaranteed  under  a  mortgage  pool  insurance  policy  unless  the  applicable
Prospectus Supplement so specifies.
 
                                       26
<PAGE>
REPRESENTATIONS AND WARRANTIES
 
    In connection with the transfer of the Mortgage Loans related to any  Series
by  the  Seller to  the Trust  Estate,  the Seller  will generally  make certain
representations and warranties  regarding the Mortgage  Loans. In certain  cases
where  the Seller acquired some or all of the Mortgage Loans related to a Series
from a Correspondent, if so  indicated in the applicable Prospectus  Supplement,
the  Seller may, rather than itself making representations and warranties, cause
the representations and warranties made by the Correspondent in connection  with
its sale of Mortgage Loans to Norwest Mortgage or Norwest Funding to be assigned
to  the Trust  Estate. In  such cases,  the Correspondent's  representations and
warranties may have been made as of a date prior to the date of execution of the
Pooling and Servicing  Agreement. Unless  otherwise provided  in the  applicable
Prospectus  Supplement, such representations and warranties (whether made by the
Seller or another party)  will generally include the  following with respect  to
the Mortgage Loans, or each Mortgage Loan, as the case may be:
 
           (i)
           the information set forth in the schedule of Mortgage Loans appearing
           as  an exhibit to such Pooling  and Servicing Agreement is correct in
    all material respects at the date or dates respecting which such information
    is furnished as specified therein;
 
          (ii)
           immediately prior to the transfer and assignment contemplated by  the
           Pooling  and Servicing  Agreement, the Seller  is the  sole owner and
    holder of the Mortgage Loan, free and  clear of any and all liens,  pledges,
    charges or security interests of any nature and has full right and authority
    to sell and assign the same;
 
         (iii)
           the Mortgage is a valid, subsisting and enforceable first lien on the
           related  Mortgaged Property, and  the Mortgaged Property  is free and
    clear of all encumbrances and liens  having priority over the first lien  of
    the  Mortgage except for liens for real estate taxes and special assessments
    not yet due and payable and liens or interests arising under or as a  result
    of  any federal,  state or  local law,  regulation or  ordinance relating to
    hazardous wastes or hazardous substances; and, if the Mortgaged Property  is
    a condominium unit, any lien for common charges permitted by statute or home
    owners  association fees; and, if the  Mortgaged Property consists of shares
    of a  cooperative housing  corporation,  any lien  for  amounts due  to  the
    cooperative  housing corporation  for unpaid  assessments or  charges or any
    lien of any assignment of rents or maintenance expenses secured by the  real
    property  owned  by the  cooperative housing  corporation; and  any security
    agreement, chattel mortgage or equivalent document related to, and delivered
    to the Trustee or a custodian with, any Mortgage establishes in the Seller a
    valid first lien on the property  described therein and the Seller has  full
    right to sell and assign the same to the Trustee;
 
          (iv)
           neither  the  Seller nor  any  prior holder  of  the Mortgage  or the
           related Mortgage  Note  has modified  the  Mortgage in  any  material
    respect;  satisfied, cancelled or  subordinated the Mortgage  or the related
    Mortgage Note in  whole or in  part; or released  the Mortgaged Property  in
    whole  or in part from the lien  of the Mortgage; or executed any instrument
    of release, cancellation, modification or satisfaction, except in each  case
    as  reflected in  a document  delivered by  the Seller  to the  Trustee or a
    custodian together with the related Mortgage;
 
           (v)
           all taxes, governmental assessments,  insurance premiums, and  water,
           sewer  and municipal charges previously due and owing have been paid,
    or an escrow of  funds in an  amount sufficient to pay  for every such  item
    which  remains unpaid has  been established to the  extent permitted by law;
    and the Seller has not advanced funds or received any advance of funds by  a
    party  other than the mortgagor, directly  or indirectly (except pursuant to
    any Buy-Down  Loan or  Subsidy Loan  arrangement), for  the payment  of  any
    amount  required by the Mortgage, except for interest accruing from the date
    of the related Mortgage  Note or date of  disbursement of the Mortgage  Loan
    proceeds,  whichever is  later, to  the date which  precedes by  30 days the
    first Due Date under the related Mortgage Note;
 
                                       27
<PAGE>
          (vi)
           the  Mortgaged Property  is undamaged  by water,  fire, earthquake or
           earth  movement,  windstorm,  flood,  tornado  or  similar   casualty
    (excluding  casualty  from the  presence  of hazardous  wastes  or hazardous
    substances, as to which the Seller makes no representation), so as to affect
    adversely the value of the Mortgaged  Property as security for the  Mortgage
    Loan  or the use for which the premises were intended and to the best of the
    Seller's knowledge, there  is no  proceeding pending or  threatened for  the
    total or partial condemnation of the Mortgaged Property;
 
         (vii)
           the  Mortgaged  Property  is free  and  clear of  all  mechanics' and
           materialmen's  liens  or  liens  in  the  nature  thereof;  provided,
    however,  that this warranty  shall be deemed  not to have  been made at the
    time of  the  initial  issuance  of  the  Certificates  if  a  title  policy
    affording,  in substance, the  same protection afforded  by this warranty is
    furnished to the Trustee by the Seller;
 
        (viii)
           except for  Mortgage Loans  secured by  shares in  cooperatives,  the
           Mortgaged  Property consists of  a fee simple  or leasehold estate in
    real property, all of the improvements which are included for the purpose of
    determining the appraised value of the Mortgaged Property lie wholly  within
    the  boundaries  and  building restriction  lines  of such  property  and no
    improvements on adjoining  properties encroach upon  the Mortgaged  Property
    (unless  insured against under an applicable title insurance policy) and, to
    the  best  of  the  Seller's  knowledge,  the  Mortgaged  Property  and  all
    improvements  thereon comply with all  requirements of any applicable zoning
    and subdivision laws and ordinances;
 
          (ix)
           the Mortgage  Loan meets,  or  is exempt  from, applicable  state  or
           federal laws, regulations and other requirements pertaining to usury,
    and the Mortgage Loan is not usurious;
 
           (x)
           to  the best of the Seller's knowledge, all inspections, licenses and
           certificates required  to  be made  or  issued with  respect  to  all
    occupied portions of the Mortgaged Property and, with respect to the use and
    occupancy  of  the  same, including,  but  not limited  to,  certificates of
    occupancy and fire  underwriting certificates,  have been  made or  obtained
    from the appropriate authorities;
 
          (xi)
           all  payments  required to  be made  up to  the Due  Date immediately
           preceding the Cut-Off Date for such Mortgage Loan under the terms  of
    the  related Mortgage Note have been made and no Mortgage Loan had more than
    one delinquency in the 12 months preceding the Cut-Off Date;
 
         (xii)
           the Mortgage Note, the related Mortgage and other agreements executed
           in connection therewith are genuine, and each is the legal, valid and
    binding obligation of the maker thereof, enforceable in accordance with  its
    terms  except as such enforcement may  be limited by bankruptcy, insolvency,
    reorganization or other similar laws affecting the enforcement of creditors'
    rights generally and  by general  equity principles  (regardless of  whether
    such enforcement is considered in a proceeding in equity or at law); and, to
    the best of the Seller's knowledge, all parties to the Mortgage Note and the
    Mortgage  had legal capacity  to execute the Mortgage  Note and the Mortgage
    and each Mortgage Note and Mortgage  has been duly and properly executed  by
    the mortgagor;
 
        (xiii)
           any  and all  requirements of  any federal,  state or  local law with
           respect to the origination of  the Mortgage Loans including,  without
    limitation,  truth-in-lending, real  estate settlement  procedures, consumer
    credit protection, equal credit opportunity or disclosure laws applicable to
    the Mortgage Loans have been complied with;
 
         (xiv)
           the proceeds of the Mortgage  Loans have been fully disbursed,  there
           is  no requirement  for future  advances thereunder  and any  and all
    requirements as to completion of any on-site or off-site improvements and as
    to disbursements  of any  escrow  funds therefor  have been  complied  with,
    except  for escrow funds for exterior items which could not be completed due
    to weather; and all costs, fees and expenses incurred in making, closing  or
    recording  the  Mortgage Loan  have been  paid,  except recording  fees with
    respect to  Mortgages  not  recorded as  of  the  date of  the  Pooling  and
    Servicing Agreement;
 
                                       28
<PAGE>
          (xv)
           the  Mortgage Loan (except a T.O.P. Loan as described above under "--
           Mortgage  Loan  Underwriting"  and  any  Mortgage  Loan  secured   by
    Mortgaged Property located in Iowa, as to which an opinion of counsel of the
    type  customarily  rendered in  such  State in  lieu  of title  insurance is
    instead received) is covered by an ALTA mortgagee title insurance policy  or
    other generally acceptable form of policy or insurance acceptable to FNMA or
    FHLMC,  issued by a title  insurer acceptable to FNMA  or FHLMC insuring the
    originator, its successors and assigns, as to the first priority lien of the
    Mortgage in the original principal amount  of the Mortgage Loan and  subject
    only  to (A) the lien of current real property taxes and assessments not yet
    due and payable, (B) covenants, conditions and restrictions,  rights-of-way,
    easements  and other matters of public record as of the date of recording of
    such Mortgage acceptable  to mortgage  lending institutions in  the area  in
    which  the Mortgaged Property is located  or specifically referred to in the
    appraisal performed  in  connection  with the  origination  of  the  related
    Mortgage  Loan, (C)  liens created pursuant  to any federal,  state or local
    law, regulation or ordinance  affording liens for the  costs of clean-up  of
    hazardous   substances  or  hazardous  wastes  or  for  other  environmental
    protection purposes and (D) such other matters to which like properties  are
    commonly  subject which do not individually, or in the aggregate, materially
    interfere with the benefits of the  security intended to be provided by  the
    Mortgage;  the Seller is the sole  insured of such mortgagee title insurance
    policy, the  assignment to  the Trustee  of the  Seller's interest  in  such
    mortgagee  title  insurance  policy  does  not  require  any  consent  of or
    notification to  the insurer  which  has not  been  obtained or  made,  such
    mortgagee  title insurance policy is in full force and effect and will be in
    full force and effect and inure to the benefit of the Trustee and no  claims
    have  been made  under such mortgagee  title insurance policy,  and no prior
    holder of the related  Mortgage, including the Seller,  has done, by act  or
    omission,  anything which would impair the  coverage of such mortgagee title
    insurance policy;
 
         (xvi)
           the Mortgaged Property securing each  Mortgage Loan is insured by  an
           insurer  acceptable to  FNMA or FHLMC  against loss by  fire and such
    hazards as are covered under a standard extended coverage endorsement, in an
    amount which is not less than the  lesser of 100% of the insurable value  of
    the Mortgaged Property and the outstanding principal balance of the Mortgage
    Loan,  but  in no  event less  than  the minimum  amount necessary  to fully
    compensate for  any damage  or loss  on  a replacement  cost basis;  if  the
    Mortgaged  Property is a condominium unit, it is included under the coverage
    afforded by a  blanket policy for  the project; if  upon origination of  the
    Mortgage  Loan, the improvements  on the Mortgaged Property  were in an area
    identified in  the  Federal Register  by  the Federal  Emergency  Management
    Agency as having special flood hazards, a flood insurance policy meeting the
    requirements   of   the  current   guidelines   of  the   Federal  Insurance
    Administration is in effect with  a generally acceptable insurance  carrier,
    in  an  amount representing  coverage not  less  than the  least of  (A) the
    outstanding principal balance of the  Mortgage Loan, (B) the full  insurable
    value  of the  Mortgaged Property  and (C)  the maximum  amount of insurance
    which was available  under the Flood  Disaster Protection Act  of 1973;  and
    each  Mortgage  obligates  the  mortgagor thereunder  to  maintain  all such
    insurance at the mortgagor's cost and expense;
 
        (xvii)
           to the best of the Seller's  knowledge, there is no default,  breach,
           violation or event of acceleration existing under any Mortgage or the
    related  Mortgage Note and no event which,  with the passage of time or with
    notice and the expiration  of any grace or  cure period, would constitute  a
    default,  breach, violation or event of acceleration; and the Seller has not
    waived  any  default,  breach,  violation  or  event  of  acceleration;   no
    foreclosure  action is threatened or has  been commenced with respect to the
    Mortgage Loan;
 
       (xviii)
           no Mortgage Note or Mortgage is  subject to any right of  rescission,
           set-off, counterclaim or defense, including the defense of usury, nor
    will  the operation of any of the terms of the Mortgage Note or Mortgage, or
    the   exercise   of   any    right   thereunder,   render   such    Mortgage
 
                                       29
<PAGE>
    unenforceable,  in  whole  or  in  part,  or  subject  it  to  any  right of
    rescission, set-off,  counterclaim  or  defense, including  the  defense  of
    usury, and no such right of rescission, set-off, counterclaim or defense has
    been asserted with respect thereto;
 
         (xix)
           each  Mortgage  Note is  payable  in monthly  payments,  resulting in
           complete amortization of the  Mortgage Loan over a  term of not  more
    than 360 months;
 
          (xx)
           each  Mortgage contains customary and  enforceable provisions such as
           to render the rights and remedies of the holder thereof adequate  for
    the  realization  against  the Mortgaged  Property  of the  benefits  of the
    security, including  realization by  judicial  foreclosure (subject  to  any
    limitation  arising from  any bankruptcy,  insolvency or  other law  for the
    relief of debtors), and there is  no homestead or other exemption  available
    to the mortgagor which would interfere with such right of foreclosure;
 
         (xxi)
           to  the best of the  Seller's knowledge, no mortgagor  is a debtor in
           any state or federal bankruptcy or insolvency proceeding;
 
        (xxii)
           each Mortgaged Property is located in the United States and  consists
           of  a one- to four-unit single  family residential property which may
    include a detached home, townhouse, condominium unit, unit in a planned unit
    development or a leasehold interest with respect to any of the foregoing or,
    in the case of Mortgage Loans  secured by shares of cooperatives, leases  or
    occupancy agreements;
 
       (xxiii)
           with  respect  to  each Buy-Down  Loan,  the funds  deposited  in the
           Buy-Down Fund, if  any, will  be sufficient,  together with  interest
    thereon  at  the rate  customarily  received by  the  Seller on  such funds,
    compounded monthly,  and adding  the  amounts required  to  be paid  by  the
    mortgagor,  to make the  scheduled payments stated in  the Mortgage Note for
    the term of the buy-down agreement; and
 
        (xxiv)
           each Mortgage Loan is  a "Qualified Mortgage"  within the meaning  of
           Section 860G of the Code.
 
    No  representations or warranties are made by  the Seller or any other party
as to the absence or effect of  hazardous wastes or hazardous substances on  any
of  the Mortgaged Properties or  on the lien of any  Mortgage or with respect to
the absence or effect of fraud in the origination of any Mortgage Loan, and  any
loss  or  liability resulting  from  the presence  or  effect of  such hazardous
wastes,   hazardous   substances   or   fraud   will   be   borne   solely    by
Certificateholders.  See  "Certain  Legal  Aspects  of  the  Mortgage  Loans  --
Environmental Considerations" below.
 
    See "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans  to
the  Trustee" for a description of  the limited remedies available in connection
with breaches of the foregoing representations and warranties.
 
                        DESCRIPTION OF THE CERTIFICATES
 
GENERAL
 
    Each Series of Certificates will include one or more Classes, each of  which
may  be  divided into  two  or more  Subclasses.  Any references  herein  to the
characteristics of a Class of Certificates may also describe the characteristics
of  a  Subclass  of  Certificates.  In  addition,  any  Class  or  Subclass   of
Certificates  may consist of two or more non-severable components, each of which
may exhibit any of the  principal or interest payment characteristics  described
herein with respect to a Class of Certificates. A Series may include one or more
Classes  of  Certificates entitled,  to the  extent of  funds available,  to (i)
principal and interest distributions in  respect of the related Mortgage  Loans,
(ii)  principal distributions,  with no  interest distributions,  (iii) interest
distributions, with no principal distributions or (iv) such other  distributions
as are described in the applicable Prospectus Supplement.
 
                                       30
<PAGE>
    Each  Series  of  Certificates will  be  issued  pursuant to  a  Pooling and
Servicing Agreement (the  "Pooling and Servicing  Agreement") among the  Seller,
Norwest  Bank, as the Master  Servicer, and the Trustee  named in the applicable
Prospectus Supplement. An illustrative form  of Pooling and Servicing  Agreement
has  been  filed as  an  exhibit to  the  Registration Statement  of  which this
Prospectus is a part. The following summaries describe certain provisions common
to the Certificates and to each  Pooling and Servicing Agreement. The  summaries
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 and  Servicing
Agreement  for  each  Series  of  Certificates  and  the  applicable  Prospectus
Supplement. Wherever particular  sections or  defined terms of  the Pooling  and
Servicing  Agreement are referred to, such sections or defined terms are thereby
incorporated herein  by  reference  from  the  form  of  Pooling  and  Servicing
Agreement filed as an exhibit to the Registration Statement.
 
    Unless   otherwise  specified  in   the  applicable  Prospectus  Supplement,
distributions  to  Certificateholders  of  all  Series  (other  than  the  final
distribution  in retirement of the Certificates) will be made by check mailed to
the address of  the person  entitled thereto (which  in the  case of  Book-Entry
Certificates  will be  DTC) as  it appears  on the  certificate register, except
that, with respect to  any holder of  a Certificate evidencing  not less than  a
certain  minimum denomination set forth in the applicable Prospectus Supplement,
distributions will  be made  by wire  transfer in  immediately available  funds,
provided  that the Master Servicer  or the Paying Agent  acting on behalf of the
Master Servicer shall have been  furnished with appropriate wiring  instructions
not  less than seven business  days prior to the  related Distribution Date. The
final distribution  in  retirement  of  Certificates  will  be  made  only  upon
presentation  and  surrender  of  the  Certificates  at  the  office  or  agency
maintained by the Trustee or other entity for such purpose, as specified in  the
final distribution notice to Certificateholders.
 
    Each  Series  of  Certificates  will represent  ownership  interests  in the
related Trust Estate. An election may be made to treat the Trust Estate (or  one
or  more  segregated  pools of  assets  therein)  with respect  to  a  Series of
Certificates as a REMIC. If such an  election is made, such Series will  consist
of  one or more Classes of  Certificates that will represent "regular interests"
within  the  meaning  of  Code   Section  860G(a)(1)  (such  Class  or   Classes
collectively  referred  to  as  the "Regular  Certificates")  and  one  Class or
Subclass of Certificates with respect to  each REMIC that will be designated  as
the  "residual  interest" within  the meaning  of  Code Section  860G(a)(2) (the
"Residual Certificates")  representing the  right  to receive  distributions  as
specified  in the  Prospectus Supplement for  such Series.  See "Certain Federal
Income Tax Consequences" herein.
 
    The Seller may sell certain Classes  or Subclasses of the Certificates of  a
Series, including one or more Classes of Subordinated Certificates, in privately
negotiated  transactions  exempt  from registration  under  the  Securities Act.
Alternatively, if  so specified  in  a Prospectus  Supplement relating  to  such
Subordinated  Certificates,  the Seller  may offer  one or  more Classes  of the
Subordinated Certificates  of a  Series by  means of  this Prospectus  and  such
Prospectus Supplement.
 
DEFINITIVE FORM
 
    Certificates  of a Series that are  issued in fully registered, certificated
form are  referred  to herein  as  "Definitive Certificates."  Distributions  of
principal of, and interest on, the Definitive Certificates will be made directly
to  holders of  Definitive Certificates  in accordance  with the  procedures set
forth in the Pooling and Servicing  Agreement. The Definitive Certificates of  a
Series offered hereby and by means of the applicable Prospectus Supplements will
be  transferable  and exchangeable  at the  office or  agency maintained  by the
Trustee or  such other  entity for  such  purpose set  forth in  the  applicable
Prospectus  Supplement.  No service  charge  will be  made  for any  transfer or
exchange of Definitive Certificates,  but the Trustee or  such other entity  may
require  payment of  a sum  sufficient to  cover any  tax or  other governmental
charge in connection with such transfer or exchange.
 
    In the event that an election is made  to treat the Trust Estate (or one  or
more  segregated pools  of assets therein)  as a REMIC,  the "residual interest"
thereof will  be issued  as a  Definitive Certificate.  No legal  or  beneficial
interest  in all or  any portion of  any "residual interest"  may be transferred
without the receipt by the transferor and the Trustee of an affidavit signed  by
the transferee stating,
 
                                       31
<PAGE>
among  other things, that the transferee  (i) is not a disqualified organization
within the meaning  of Code  Section 860E(e) or  an agent  (including a  broker,
nominee,  or  middleman) thereof  and  (ii) understands  that  it may  incur tax
liabilities in excess  of any  cash flows  generated by  the residual  interest.
Further, the transferee must state in the affidavit that it (x) historically has
paid  its debts as they have come due, (y) intends to pay its debts as they come
due in the  future and  (z) intends  to pay  taxes associated  with holding  the
residual interest as they become due. The transferor must certify to the Trustee
that, as of the time of the transfer, it has no actual knowledge that any of the
statements made in the transferee affidavit are false and no reason to know that
the  statements made by the  transferee pursuant to clauses  (x), (y) and (z) of
the preceding sentence are false.  See "Certain Federal Income Tax  Consequences
- --  Federal  Income  Tax  Consequences for  REMIC  Certificates  --  Taxation of
Residual Certificates  --  Tax-Related  Restrictions  on  Transfer  of  Residual
Certificates."
 
BOOK-ENTRY FORM
 
    Each  Class or Subclass of the Book-Entry Certificates of a Series initially
will be represented by one or more physical certificates registered in the  name
of  Cede  & Co.  ("Cede"), as  nominee of  DTC,  which will  be the  "holder" or
"Certificateholder" of  such Certificates,  as such  terms are  used herein.  No
person  acquiring an interest in a Book-Entry Certificate (a "Beneficial Owner")
will be entitled to receive a Definitive Certificate representing such  person's
interest  in the Book-Entry  Certificate, except as set  forth below. Unless and
until  Definitive  Certificates  are  issued  under  the  limited  circumstances
described  herein,  all references  to  actions taken  by  Certificateholders or
holders shall, in  the case  of the  Book-Entry Certificates,  refer to  actions
taken  by DTC  upon instructions from  its DTC Participants,  and all references
herein to distributions, notices,  reports and statements to  Certificateholders
or  holders  shall,  in  the  case  of  the  Book-Entry  Certificates,  refer to
distributions, notices, reports and statements to DTC or Cede, as the registered
holder of the Book-Entry Certificates, as  the case may be, for distribution  to
Beneficial Owners in accordance with DTC procedures.
 
    DTC is a limited purpose trust company organized under the laws of the State
of  New York, 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 Section 17A  of the Securities  Exchange Act of
1934, as  amended. DTC  was created  to hold  securities for  its  participating
organizations   ("DTC  Participants")  and  to   facilitate  the  clearance  and
settlement of securities transactions among DTC Participants through  electronic
book-entries,   thereby   eliminating  the   need   for  physical   movement  of
certificates. DTC Participants include securities brokers and dealers (which may
include any underwriter  identified in the  Prospectus Supplement applicable  to
any  Series), banks, trust companies  and clearing corporations. Indirect access
to the DTC system also is available to banks, brokers, dealers, trust  companies
and  other institutions that clear through  or maintain a custodial relationship
with  a  DTC   Participant,  either  directly   or  indirectly  ("Indirect   DTC
Participants").
 
    Under  the rules, regulations and procedures  creating and affecting DTC and
its operations (the "Rules"),  DTC is required to  make book-entry transfers  of
Book-Entry  Certificates among  DTC Participants  on whose  behalf it  acts with
respect to the Book-Entry Certificates and to receive and transmit distributions
of principal of and  interest on the  Book-Entry Certificates. DTC  Participants
and  Indirect DTC Participants  with which Beneficial  Owners 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
Beneficial Owners.
 
    Beneficial Owners 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,  Beneficial Owners will receive all
distributions of principal and  interest from the Master  Servicer, or a  Paying
Agent  on  behalf of  the Master  Servicer, through  DTC Participants.  DTC will
forward such  distributions  to  its DTC  Participants,  which  thereafter  will
forward  them  to Indirect  DTC  Participants or  Beneficial  Owners. Beneficial
Owners will not  be recognized  by the  Trustee or  the Master  Servicer or  any
paying
 
                                       32
<PAGE>
agent  as Certificateholders, as such term is  used in the Pooling and Servicing
Agreement, and Beneficial  Owners will be  permitted to exercise  the rights  of
Certificateholders only indirectly through DTC and its DTC Participants.
 
    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
Beneficial  Owner to pledge Book-Entry Certificates  to persons or entities that
do not participate in the DTC system,  or to otherwise act with respect to  such
Book-Entry  Certificates,  may  be  limited  due  to  the  lack  of  a  physical
certificate for such  Book-Entry Certificates. In  addition, under a  book-entry
format,  Beneficial Owners may  experience delays in  their receipt of payments,
since distributions will be made  by the Master Servicer,  or a paying agent  on
behalf of the Master Servicer, to Cede, as nominee for DTC.
 
    DTC  has advised  the Seller that  it will  take any action  permitted to be
taken by a Certificateholder under the  Pooling and Servicing Agreement only  at
the  direction of one  or more DTC  Participants to whose  accounts with DTC the
Book-Entry Certificates are credited. Additionally,  DTC has advised the  Seller
that  it will take such actions with  respect to specified Voting Interests only
at the  direction  of  and on  behalf  of  DTC Participants  whose  holdings  of
Book-Entry  Certificates evidence such specified  Voting Interests. DTC may take
conflicting actions with  respect to  Voting Interests  to the  extent that  DTC
Participants  whose  holdings of  Book-Entry  Certificates evidence  such Voting
Interests authorize divergent action.
 
    Neither the  Seller, the  Master  Servicer nor  the  Trustee will  have  any
responsibility  for any aspect  of the records  relating to or  payments made on
account of beneficial ownership interests of the Book-Entry Certificates held by
Cede, as  nominee for  DTC, or  for maintaining,  supervising or  reviewing  any
records  relating to  such beneficial ownership  interests. In the  event of the
insolvency of DTC,  a DTC Participant  or an Indirect  DTC Participant in  whose
name  Book-Entry  Certificates are  registered,  the ability  of  the Beneficial
Owners of such  Book-Entry Certificates  to obtain  timely payment  and, if  the
limits  of applicable insurance  coverage by the  Securities Investor Protection
Corporation are exceeded or if such coverage is otherwise unavailable,  ultimate
payment,  of amounts distributable with  respect to such Book-Entry Certificates
may be impaired.
 
    The Book-Entry Certificates will be converted to Definitive Certificates and
reissued to  Beneficial Owners  or their  nominees, rather  than to  DTC or  its
nominee,  only if (i)  the Trustee is advised  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 is unable  to locate a
qualified successor,  (ii)  the  Master  Servicer,  at  its  option,  elects  to
terminate  the book-entry system through DTC or  (iii) after the occurrence of a
dismissal or resignation of the Master Servicer under the Pooling and  Servicing
Agreement,  Beneficial  Owners  representing not  less  than 51%  of  the Voting
Interests of the outstanding Book-Entry Certificates advise the Trustee  through
DTC,  in writing, that the continuation of a book-entry system through DTC (or a
successor thereto) is no longer in the Beneficial Owners' best interest.
 
    Upon the  occurrence of  any event  described in  the immediately  preceding
paragraph,  the Trustee will be required to notify all Beneficial Owners through
DTC Participants of the availability of Definitive Certificates. Upon  surrender
by DTC of the physical certificates representing the Book-Entry Certificates and
receipt  of instructions for re-registration, the Trustee will reissue the Book-
Entry  Certificates  as  Definitive  Certificates  to  Beneficial  Owners.   The
procedures  relating to payment on and transfer of Certificates initially issued
as  Definitive   Certificates  will   thereafter  apply   to  those   Book-Entry
Certificates that have been reissued as Definitive Certificates.
 
DISTRIBUTIONS TO CERTIFICATEHOLDERS
 
    GENERAL.  On each Distribution Date, each holder of a Certificate of a Class
will be entitled to receive its Certificate's Percentage Interest of the portion
of  the Pool Distribution Amount (as defined below) allocated to such Class. The
undivided percentage  interest (the  "Percentage Interest")  represented by  any
Certificate  of a  Subclass or  any Class in  distributions to  such Subclass or
Class will be
 
                                       33
<PAGE>
equal to the percentage obtained by  dividing the initial principal balance  (or
notional  amount) of such Certificate by the aggregate initial principal balance
(or notional amount) of all Certificates of such Subclass or Class, as the  case
may be.
 
    In  general, the funds available for distribution to Certificateholders of a
Series of Certificates with  respect to each Distribution  Date for such  Series
(the "Pool Distribution Amount") will be the sum of all previously undistributed
payments  or  other  receipts  on  account  of  principal  (including  principal
prepayments and Liquidation Proceeds, if any)  and interest on or in respect  of
the  related Mortgage Loans  received by the related  Servicer after the Cut-Off
Date (except for amounts due  on or prior to the  Cut-Off Date), or received  by
the  related Servicer on or prior to the  Cut-Off Date but due after the Cut-Off
Date, in either  case received on  or prior  to the business  day preceding  the
Determination Date in the month in which such Distribution Date occurs, plus all
Periodic  Advances with respect to  payments due to be  received on the Mortgage
Loans on  the Due  Date  preceding such  Distribution  Date, but  excluding  the
following:
 
           (a)
           amounts received as late payments of principal or interest respecting
           which one or more unreimbursed Periodic Advances has been made;
 
           (b)
           that  portion of Liquidation Proceeds with respect to a Mortgage Loan
           which represents any unreimbursed Periodic Advances;
 
           (c)
           those portions of each payment  of interest on a particular  Mortgage
           Loan  which represent (i) the Fixed  Retained Yield, if any, (ii) the
    applicable Servicing Fee,  (iii) the applicable  Master Servicing Fee,  (iv)
    the  Trustee's fee  and (v)  any other  amounts described  in the applicable
    Prospectus Supplement;
 
           (d)
           all amounts representing scheduled payments of principal and interest
           due after  the  Due  Date  occurring  in  the  month  in  which  such
    Distribution Date occurs;
 
           (e)
           all  proceeds (including Liquidation Proceeds  other than, in certain
           cases  as  specified   in  the   applicable  Prospectus   Supplement,
    Liquidation  Proceeds which  were received  prior to  the related Servicer's
    determination that no further recoveries  on a defaulted Mortgage Loan  will
    be  forthcoming ("Partial Liquidation Proceeds"))  of any Mortgage Loans, or
    property acquired  in respect  thereof,  that were  liquidated,  foreclosed,
    purchased  or repurchased pursuant  to the applicable  Pooling and Servicing
    Agreement, which proceeds were received on  or after the Due Date  occurring
    in  the  month in  which  such Distribution  Date  occurs and  all principal
    prepayments in full, partial  principal prepayments and Partial  Liquidation
    Proceeds received by the related Servicer on or after the Determination Date
    (or,  in certain cases as specified in the applicable Prospectus Supplement,
    the Due Date) occurring in the month in which such Distribution Date occurs,
    and all related payments of interest on such amounts;
 
           (f)
           that portion  of Liquidation  Proceeds  which represents  any  unpaid
           Servicing  Fees, Master Servicing Fee or any Trustee Fee to which the
    related Servicer,  the  Trustee or  the  Master Servicer,  respectively,  is
    entitled and any unpaid Fixed Retained Yield;
 
           (g)
           if  an election has been made to treat the applicable Trust Estate as
           a  REMIC,  any   Net  Foreclosure  Profits   with  respect  to   such
    Distribution Date;
 
           (h)
           all  amounts representing certain expenses reimbursable to the Master
           Servicer or any Servicer and other amounts permitted to be  withdrawn
    by  the Master Servicer from the  Certificate Account, in each case pursuant
    to the applicable Pooling and Servicing Agreement;
 
           (i)
           all amounts in the nature  of late fees, assumption fees,  prepayment
           fees  and similar fees and payments  of interest related to principal
    prepayments received on  or after  the first  day of  the month  in which  a
    Distribution Date occurs and prior to the Determination Date in the month of
    such  Distribution Date  which the  related Servicer  is entitled  to retain
    pursuant to the applicable Underlying Servicing Agreement;
 
                                       34
<PAGE>
           (j)
           reinvestment earnings on payments received in respect of the Mortgage
           Loans; and
 
           (k)
           any  recovery  of  an  amount  in  respect  of  principal  which  had
           previously  been  allocated  as a  realized  loss to  such  Series of
    Certificates.
 
    The  applicable  Prospectus  Supplement  for  a  Series  will  describe  any
variation in the calculation of the Pool Distribution Amount for such Series.
 
    "Net  Foreclosure Profits" with  respect to a Distribution  Date will be the
excess of (i) the portion of aggregate net Liquidation Proceeds which represents
the amount by which aggregate profits on Liquidated Loans with respect to  which
net  Liquidation  Proceeds  exceed  the unpaid  principal  balance  thereof plus
accrued interest  thereon at  the  Mortgage Interest  Rate over  (ii)  aggregate
realized  losses  on  Liquidated Loans  with  respect to  which  net Liquidation
Proceeds are  less  than  the  unpaid principal  balance  thereof  plus  accrued
interest thereon at the Mortgage Interest Rate.
 
    DISTRIBUTIONS  OF INTEREST.   With respect  to each  Series of Certificates,
interest on the related Mortgage Loans at the weighted average of the applicable
Net Mortgage Interest Rates thereof, will  be passed through monthly to  holders
of  the related Classes of Certificates in the aggregate, in accordance with the
particular terms of each such Class of Certificates. The "Net Mortgage  Interest
Rate"  for each Mortgage Loan in a given period will equal the mortgage interest
rate for such Mortgage Loan in such period, as specified in the related mortgage
note (the  "Mortgage Interest  Rate"), less  the portion  thereof, if  any,  not
contained  in the  Trust Estate (the  "Fixed Retained Yield"),  and less amounts
payable to the Servicers for servicing the Mortgage Loan (the "Servicing  Fee"),
the  fee payable to  the Master Servicer  (the "Master Servicing  Fee"), the fee
payable to the Trustee (the "Trustee Fee") and any related expenses specified in
the applicable Prospectus.
 
    Interest will  accrue  on the  principal  balance (or  notional  amount,  as
described  below)  of each  Class of  Certificates entitled  to interest  at the
Pass-Through  Rate  for  such  Class  indicated  in  the  applicable  Prospectus
Supplement  (which may be a fixed rate or  an adjustable rate) from the date and
for the periods specified in such Prospectus Supplement. To the extent the  Pool
Distribution  Amount is  available therefor,  interest accrued  during each such
specified period on each Class of Certificates entitled to interest (other  than
a  Class that provides for interest that  accrues, but is not currently payable,
referred to hereafter as  "Accrual Certificates") will  be distributable on  the
Distribution  Dates specified in the  applicable Prospectus Supplement until the
principal balance (or notional amount) of  such Class has been reduced to  zero.
Distributions  allocable to interest on each Certificate that is not entitled to
distributions allocable to principal will  generally be calculated based on  the
notional  amount of such Certificate. The  notional amount of a Certificate will
not evidence  an  interest  in  or entitlement  to  distributions  allocable  to
principal  but will be  solely for convenience in  expressing the calculation of
interest and for certain other purposes.
 
    With respect to  any Class of  Accrual Certificates, any  interest that  has
accrued  but is  not paid  on a  given Distribution  Date will  be added  to the
principal balance  of such  Class  of Certificates  on that  Distribution  Date.
Distributions  of interest on  each Class of  Accrual Certificates will commence
only after the  occurrence of the  events or the  existence of the  circumstance
specified  in such  Prospectus Supplement  and, prior  to such  time, or  in the
absence of such circumstances, the principal balance of such Class will increase
on each Distribution Date by the amount  of interest that accrued on such  Class
during  the preceding interest  accrual period but  that was not  required to be
distributed to such Class on such  Distribution Date. Any such Class of  Accrual
Certificates  will  thereafter  accrue  interest  on  its  outstanding principal
balance as so adjusted.
 
    DISTRIBUTIONS  OF  PRINCIPAL.    The  principal  balance  of  any  Class  of
Certificates  entitled  to  distributions  of principal  will  generally  be the
original  principal  balance  of  such   Class  specified  in  such   Prospectus
Supplement,  reduced  by  all  distributions reported  to  the  holders  of such
Certificates as allocable to  principal and any losses  on the related  Mortgage
Loans  allocated to such  Class of Certificates  and (i) in  the case of Accrual
Certificates, increased by all  interest accrued but  not then distributable  on
such  Accrual Certificates  and (ii)  in the  case of  a Series  of Certificates
representing
 
                                       35
<PAGE>
interests in a Trust Estate containing adjustable rate Mortgage Loans, increased
by any Deferred  Interest allocable to  such Class. The  principal balance of  a
Class  or Subclass  of Certificates  generally represents  the maximum specified
dollar amount (exclusive of (i)  any interest that may  accrue on such Class  or
Subclass  to which  the holder  thereof is  entitled from  the cash  flow on the
related Mortgage  Loans  at  such  time)  and will  decline  to  the  extent  of
distributions  in  reduction of  the principal  balance  of, and  allocations of
losses to such Class  or Subclass. Certificates with  no principal balance  will
not  receive distributions  in respect  of principal.  The applicable Prospectus
Supplement will  specify the  method by  which  the amount  of principal  to  be
distributed on the Certificates on each Distribution Date will be calculated and
the  manner  in  which  such  amount will  be  allocated  among  the  Classes of
Certificates entitled to distributions of principal.
 
    If so provided in the applicable Prospectus Supplement, one or more  Classes
of  Senior Certificates  will be entitled  to receive all  or a disproportionate
percentage of the  payments of  principal that  are received  from borrowers  in
advance  of  their  scheduled  due  dates and  are  not  accompanied  by amounts
representing scheduled interest  due after  the months  of such  payments or  of
other  unscheduled principal receipts or recoveries in the percentages and under
the circumstances or for  the periods specified  in such Prospectus  Supplement.
Any  such allocation of  principal prepayments or  other unscheduled receipts or
recoveries  in  respect  of  principal  to  such  Class  or  Classes  of  Senior
Certificates  will  have the  effect of  accelerating  the amortization  of such
Senior Certificates while increasing the interests evidenced by the Subordinated
Certificates in the Trust Estate.  Increasing the interests of the  Subordinated
Certificates relative to that of the Senior Certificates is intended to preserve
the availability of the subordination provided by the Subordinated Certificates.
 
    If  specified in  the applicable  Prospectus Supplement,  the rights  of the
holders of the Subordinated Certificates of  a Series of Certificates for  which
credit  enhancement is  provided through subordination  to receive distributions
with respect  to  the  Mortgage  Loans  in the  related  Trust  Estate  will  be
subordinated  to such rights  of the holders  of the Senior  Certificates of the
same Series to the extent described below, except as otherwise set forth in such
Prospectus Supplement. This subordination is intended to enhance the  likelihood
of  regular receipt  by holders  of Senior  Certificates of  the full  amount of
scheduled monthly payments  of principal and  interest due them  and to  provide
limited  protection to the holders of the Senior Certificates against losses due
to mortgagor defaults.
 
    The protection afforded to the holders of Senior Certificates of a Series of
Certificates for which credit enhancement  is provided through subordination  by
the   subordination  feature  described  above  will  be  effected  by  (i)  the
preferential right of such holders to  receive, prior to any distribution  being
made  in respect of  the related Subordinated  Certificates on each Distribution
Date, current  distributions on  the  related Mortgage  Loans of  principal  and
interest  due them  on each  Distribution Date  out of  the funds  available for
distribution on such date in the related Certificate Account, (ii) by the  right
of such holders to receive future distributions on the Mortgage Loans that would
otherwise  have been payable to the  holders of Subordinated Certificates and/or
(iii) by  the prior  allocation to  the Subordinated  Certificates of  all or  a
portion of losses realized on the related Mortgage Loans.
 
    Losses  realized  on liquidated  Mortgage Loans  (other than  Excess Special
Hazard Losses, Excess  Fraud Losses  and Excess Bankruptcy  Losses as  described
below)  will be allocated to the  holders of Subordinated Certificates through a
reduction of the  amount of principal  payments on the  Mortgage Loans to  which
such  holders are entitled before any corresponding reduction is made in respect
of the Senior Certificate.
 
    A "Special Hazard Loss" is a loss on a liquidated Mortgage Loan occurring as
a result  of a  hazard not  insured against  under a  standard hazard  insurance
policy  of the type described herein under  "The Trust Estates -- Mortgage Loans
- -- Insurance Policies." A "Fraud Loss" is  a loss on a liquidated Mortgage  Loan
as  to  which  there was  fraud  in the  origination  of such  Mortgage  Loan. A
"Bankruptcy Loss"  is a  loss  on a  liquidated  Mortgage Loan  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 interest  rate on  a Mortgage  Loan or  an extension  of its
maturity. Special
 
                                       36
<PAGE>
Hazard Losses in  excess of the  amount specified in  the applicable  Prospectus
Supplement  (the  "Special  Hazard  Loss  Amount")  are  "Excess  Special Hazard
Losses." Fraud  Losses in  excess  of the  amount  specified in  the  applicable
Prospectus  Supplement  (the "Fraud  Loss  Amount") are  "Excess  Fraud Losses."
Bankruptcy losses in excess of the amount specified in the applicable Prospectus
Supplement (the "Bankruptcy  Loss Amount") are  "Excess Bankruptcy Losses."  Any
Excess  Special Hazard Losses,  Excess Fraud Losses  or Excess Bankruptcy Losses
with respect to a Series will be allocated on a pro rata basis among the related
Classes of Senior and  Subordinated Certificates. An allocation  of a loss on  a
"pro  rata basis" among two or more  Classes of Certificates means an allocation
on a pro rata  basis to each such  Class of Certificates on  the basis of  their
then-outstanding  principal balances in  the case of the  principal portion of a
loss or based on the accrued interest thereon in the case of an interest portion
of a loss.
 
    Since the amounts of the Special  Hazard Loss Amount, Fraud Loss Amount  and
Bankruptcy Loss Amount for a Series of Certificates are each expected to be less
than the amount of principal payments on the Mortgage Loans to which the holders
of  the Subordinated  Certificates of such  Series are  initially entitled (such
amount being subject to reduction, as described above, as a result of allocation
of losses on liquidated Mortgage Loans that are not Special Hazard Losses, Fraud
Losses or Bankruptcy Losses), the  holders of Subordinated Certificates of  such
Series  will bear the risk of Special Hazard Losses, Fraud Losses and Bankruptcy
Losses to  a  lesser extent  than  they will  bear  other losses  on  liquidated
Mortgage Loans.
 
    Although  the subordination feature  described above is  intended to enhance
the likelihood of  timely payment of  principal and interest  to the holders  of
Senior  Certificates,  shortfalls  could result  in  certain  circumstances. For
example, a shortfall in  the payment of principal  otherwise due the holders  of
Senior  Certificates could occur if  losses realized on the  Mortgage Loans in a
Trust Estate  were exceptionally  high  and were  concentrated in  a  particular
month.
 
    The  holders of Subordinated Certificates will not be required to refund any
amounts previously properly distributed to them, regardless of whether there are
sufficient funds on a subsequent Distribution  Date to make a full  distribution
to holders of each Class of Senior Certificates of the same Series.
 
OTHER CREDIT ENHANCEMENT
 
    In  addition to, or in substitution  for, the subordination discussed above,
credit enhancement may be provided with respect to any Series of Certificates in
any other manner which may be described in the applicable Prospectus Supplement,
including, but not limited to, credit enhancement through an alternative form of
subordination and/or one or more of the methods described below.
 
    LIMITED GUARANTEE
 
    If so specified  in the Prospectus  Supplement with respect  to a Series  of
Certificates,  credit  enhancement may  be  provided in  the  form of  a limited
guarantee issued by a guarantor named therein.
 
    FINANCIAL GUARANTY INSURANCE POLICY OR SURETY BOND
 
    If so specified  in the Prospectus  Supplement with respect  to a Series  of
Certificates  credit  enhancement may  be provided  in the  form of  a financial
guaranty insurance policy or a surety bond issued by an insurer named therein.
 
    LETTER OF CREDIT
 
    Alternative credit support with respect to  a Series of Certificates may  be
provided  by  the  issuance of  a  letter of  credit  by the  bank  or financial
institution specified  in the  applicable Prospectus  Supplement. The  coverage,
amount and frequency of any reduction in coverage provided by a letter of credit
issued  with  respect to  a  Series of  Certificates will  be  set forth  in the
Prospectus Supplement relating to such Series.
 
                                       37
<PAGE>
    POOL INSURANCE POLICIES
 
    If so  specified  in the  Prospectus  Supplement  relating to  a  Series  of
Certificates,  the Seller will  obtain a pool insurance  policy for the Mortgage
Loans in the related Trust Estate. The pool insurance policy will cover any loss
(subject to the limitations described  in the applicable Prospectus  Supplement)
by reason of default to the extent a related Mortgage Loan is not covered by any
primary  mortgage insurance policy.  The amount and principal  terms of any such
coverage will be set forth in the Prospectus Supplement.
 
    SPECIAL HAZARD INSURANCE POLICIES
 
    If so specified in the applicable Prospectus Supplement, for each Series  of
Certificates  as to which a  pool insurance policy is  provided, the Seller will
also obtain a special  hazard insurance policy for  the related Trust Estate  in
the amount set forth in such Prospectus Supplement. The special hazard insurance
policy  will, subject to the limitations  described in the applicable Prospectus
Supplement, protect against  loss by  reason of damage  to Mortgaged  Properties
caused  by certain hazards not insured against under the standard form of hazard
insurance policy for the respective states in which the Mortgaged Properties are
located. The amount and principal terms of  any such coverage will be set  forth
in the Prospectus Supplement.
 
    MORTGAGOR BANKRUPTCY BOND
 
    If  so specified in  the applicable Prospectus  Supplement, losses resulting
from a  bankruptcy proceeding  relating to  a mortgagor  affecting the  Mortgage
Loans in a Trust Estate with respect to a Series of Certificates will be covered
under  a mortgagor bankruptcy bond (or any other instrument that will not result
in a downgrading of  the rating of  the Certificates of a  Series by the  Rating
Agency or Rating Agencies that rated such Series). Any mortgagor bankruptcy bond
or  such other  instrument will  provide for coverage  in an  amount meeting the
criteria of the Rating Agency or Rating Agencies rating the Certificates of  the
related  Series, which  amount will  be set  forth in  the applicable Prospectus
Supplement. The amount  and principal  terms of any  such coverage  will be  set
forth in the Prospectus Supplement.
 
    RESERVE FUND
 
    If  so specified in the applicable Prospectus Supplement, credit enhancement
with respect to a Series of Certificates may be provided by the establishment of
one or more reserve funds (each, a "Reserve Fund") for such Series.
 
    The Reserve Fund for a  Series may be funded (i)  by the deposit therein  of
cash,  U.S. Treasury securities or instruments evidencing ownership of principal
or interest payments thereon, letters  of credit, demand notes, certificates  of
deposit  or  a combination  thereof  in the  aggregate  amount specified  in the
applicable Prospectus Supplement, (ii) by the deposit therein from time to  time
of  certain amounts,  as specified in  the applicable  Prospectus Supplement, to
which the certain Classes of Certificates  would otherwise be entitled or  (iii)
in  such  other  manner  as  may  be  specified  in  the  applicable  Prospectus
Supplement.
 
    CROSS SUPPORT
 
    If  specified  in  the  applicable  Prospectus  Supplement,  the  beneficial
ownership of separate groups of Mortgage Loans included in a Trust Estate may be
evidenced  by separate Classes of Certificates. In such case, credit support may
be provided by a cross support feature which requires that distributions be made
with respect to certain Classes from mortgage loan payments that would otherwise
be distributed to  Subordinated Certificates evidencing  a beneficial  ownership
interest  in  other loan  groups within  the same  Trust Estate.  The applicable
Prospectus Supplement for a  Series that includes a  cross support feature  will
describe the specific operation of any such cross support feature.
 
                                       38
<PAGE>
                      PREPAYMENT AND YIELD CONSIDERATIONS
 
PASS-THROUGH RATES
 
    Any Class of Certificates of a Series may have a fixed Pass-Through Rate, or
a  Pass-Through  Rate which  varies based  on changes  in an  index or  based on
changes with respect  to the underlying  Mortgage Loans (such  as, for  example,
varying  on the basis of  changes in the weighted  average Net Mortgage Interest
Rate of the underlying Mortgage Loans).
 
    The Prospectus Supplement  for each Series  will specify the  range and  the
weighted average of the Mortgage Interest Rates and, if applicable, Net Mortgage
Interest  Rates for the Mortgage Loans underlying  such Series as of the Cut-Off
Date. If the Trust  Estate includes adjustable-rate  Mortgage Loans or  includes
Mortgage  Loans with different Net Mortgage Interest Rates, the weighted average
Net Mortgage Interest Rate may  vary from time to time  as set forth below.  See
"The  Trust Estates." The  Prospectus Supplement for a  Series will also specify
the initial weighted average Pass-Through Rate for each Class of Certificates of
such Series and will specify whether each such Pass-Through Rate is fixed or  is
variable.
 
    The  Net Mortgage Interest  Rate for any  adjustable-rate Mortgage Loan will
change with any  changes in  the index  specified in  the applicable  Prospectus
Supplement  on which such Mortgage Interest  Rate adjustments are based, subject
to any applicable periodic or aggregate  caps or floors on the related  Mortgage
Interest  Rate. The weighted average Net  Mortgage Interest Rate with respect to
any Series  may vary  due  to changes  in the  Net  Mortgage Interest  Rates  of
adjustable-rate  Mortgage Loans,  to the  timing of  the Mortgage  Interest Rate
readjustments of  such Mortgage  Loans  and to  different  rates of  payment  of
principal  of fixed or adjustable-rate Mortgage Loans bearing different Mortgage
Interest Rates.
 
SCHEDULED DELAYS IN DISTRIBUTIONS
 
    At the date of initial issuance  of the Certificates of each Series  offered
hereby, the initial purchasers of a Class of Certificates may be required to pay
accrued  interest at  the applicable Pass-Through  Rate for such  Class from the
Cut-Off Date for such Series  to, but not including,  the date of issuance.  The
effective yield to Certificateholders will be below the yield otherwise produced
by  the applicable Pass-Through  Rate because the  distribution of principal and
interest which is due on each Due Date  will not be made until the 25th day  (or
if  such 25th day is not a  business day, the business day immediately following
such 25th day) of the month in which  such Due Date occurs (or until such  other
Distribution Date specified in the applicable Prospectus Supplement).
 
EFFECT OF PRINCIPAL PREPAYMENTS
 
    When  a Mortgage Loan is prepaid in full, the mortgagor pays interest on the
amount prepaid only to  the date of prepayment  and not thereafter.  Liquidation
Proceeds  (as defined  herein) and amounts  received in  settlement of insurance
claims are  also likely  to include  interest only  to the  time of  payment  or
settlement.  When a  Mortgage Loan is  prepaid in  full or in  part, an interest
shortfall may result depending  on the timing of  the receipt of the  prepayment
and   the   timing   of   when  those   prepayments   are   passed   through  to
Certificateholders.  To  partially  mitigate   this  reduction  in  yield,   the
Underlying  Servicing Agreements relating to a Series may provide, to the extent
specified in the applicable Prospectus Supplement, that with respect to  certain
principal  prepayments received on or, the Master Servicer will be obligated, on
or before each Distribution Date,  to pay an amount equal  to the lesser of  (i)
the  aggregate  interest  shortfall  with  respect  to  such  Distribution  Date
resulting from principal prepayments in full by mortgagors and (ii) the  portion
of  the Master  Servicer's master  servicing compensation  for such Distribution
Date specified in the applicable  Prospectus Supplement. No comparable  interest
shortfall  coverage  will be  provided by  the Master  Servicer with  respect to
liquidations of any Mortgage Loans  or partial principal payments. Any  interest
shortfall  arising from prepayments not so  covered or from liquidations will be
covered  by  means  of   the  subordination  of   the  rights  of   Subordinated
Certificateholders or any other credit support arrangements.
 
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<PAGE>
    A  lower  rate of  principal prepayments  than anticipated  would negatively
affect the total return to  investors in any Certificates  of a Series that  are
offered  at a discount to their principal  amount and a higher rate of principal
prepayments than  anticipated  would  negatively  affect  the  total  return  to
investors in the Certificates of a Series that are offered at a premium to their
principal  amount.  The  yield  on  Certificates  that  are  entitled  solely or
disproportionately to distributions of principal or interest may be particularly
sensitive to prepayment rates, and further information with respect to yield  on
such Certificates will be included in the applicable Prospectus Supplement.
 
WEIGHTED AVERAGE LIFE OF CERTIFICATES
 
    The  Mortgage Loans may be prepaid in full  or in part at any time. Mortgage
Loan generally will not provide for a  prepayment penalty but may so provide  if
indicated  in  the  related  Prospectus Supplement.  Fixed  rate  Mortgage Loans
generally  will  contain  due-on-sale   clauses  permitting  the  mortgagee   to
accelerate  the maturities of the Mortgage  Loans upon conveyance of the related
Mortgaged Properties, and adjustable-rate  Mortgage Loans generally will  permit
creditworthy  borrowers  to  assume  the  then-outstanding  indebtedness  on the
Mortgage Loans.
 
    Prepayments on Mortgage Loans are commonly measured relative to a prepayment
standard or model. The Prospectus Supplement for each Series of Certificates may
describe one or  more such  prepayment standards  or models  and contain  tables
setting  forth the weighted average life of each Class and the percentage of the
original aggregate principal balance of each Class that would be outstanding  on
specified  Distribution  Dates  for  such Series  and  the  projected  yields to
maturity on  certain Classes  thereof, in  each case  based on  the  assumptions
stated  in such Prospectus Supplement, including assumptions that prepayments on
the Mortgage Loans are made at rates corresponding to various percentages of the
prepayment standard or model specified in such Prospectus Supplement.
 
    There is no  assurance that prepayment  of the Mortgage  Loans underlying  a
Series  of Certificates will conform to any  level of the prepayment standard or
model specified in the  applicable Prospectus Supplement.  A number of  factors,
including  but not limited  to homeowner mobility,  economic conditions, natural
disasters, changes in mortgagors' housing needs, job transfers, unemployment or,
in the  case  of  borrowers  relying  on  commission  income  and  self-employed
borrowers,  significant fluctuations  in income or  adverse economic conditions,
mortgagors' net equity in the  properties securing the mortgages, including  the
use  of second or "home  equity" mortgage loans by mortgagors  or the use of the
properties as second or vacation  homes, servicing decisions, enforceability  of
due-on-sale  clauses, mortgage market interest  rates, mortgage recording taxes,
competition among  mortgage loan  originators resulting  in reduced  refinancing
costs,  reduction in documentation requirements and willingness to accept higher
loan-to-value ratios,  and  the  availability  of  mortgage  funds,  may  affect
prepayment  experience. In general,  however, if prevailing  interest rates fall
below the  Mortgage Interest  Rates borne  by the  Mortgage Loans  underlying  a
Series  of Certificates, the prepayment rates  of such Mortgage Loans are likely
to be higher than if prevailing rates remain at or above the rates borne by such
Mortgage Loans. Conversely, if prevailing interest rates rise above the Mortgage
Interest Rates borne  by the Mortgage  Loans, the Mortgage  Loans are likely  to
experience  a lower prepayment rate than if  prevailing rates remain at or below
such  Mortgage  Interest  Rates.  However,  there  can  be  no  assurance   that
prepayments  will rise or fall  according to such changes  in interest rates. It
should be noted  that Certificates of  a Series  may evidence an  interest in  a
Trust Estate with different Mortgage Interest Rates. Accordingly, the prepayment
experience  of such Certificates will to some extent be a function of the mix of
interest rates of the Mortgage Loans.  In addition, the terms of the  Underlying
Servicing   Agreements  will  require  the   related  Servicer  to  enforce  any
due-on-sale clause  to the  extent it  has knowledge  of the  conveyance or  the
proposed  conveyance of  the underlying  Mortgaged Property;  provided, however,
that any enforcement action  that the Servicer  determines would jeopardize  any
recovery  under  any  related  primary mortgage  insurance  policy  will  not be
required and provided, further, that the  Servicer may permit the assumption  of
defaulted Mortgage Loans. See "Servicing of the Mortgage Loans -- Enforcement of
Due-on-Sale Clauses; Realization Upon Defaulted Mortgage
 
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<PAGE>
Loans"  and "Certain Legal Aspects of the Mortgage Loans -- Due-On-Sale Clauses"
for a description of certain provisions of each Pooling and Servicing  Agreement
and  certain legal developments that may affect the prepayment experience on the
Mortgage Loans.
 
    At the request of the mortgagor, a Servicer, including Norwest Mortgage, may
allow the refinancing of a  Mortgage Loan in any  Trust Estate serviced by  such
Servicer by accepting prepayments thereon and permitting a new loan secured by a
Mortgage  on the same property. Upon such  refinancing, the new loan will not be
included in the Trust Estate. A mortgagor may be legally entitled to require the
Servicer to allow such  a refinancing. Any such  refinancing will have the  same
effect  as a prepayment in  full of the related Mortgage  Loan. In this regard a
Servicer may,  from  time to  time,  implement programs  designed  to  encourage
refinancing  through  such Servicer,  including but  not  limited to  general or
targeted solicitations, or  the offering of  pre-approved applications,  reduced
origination fees or closing costs, or other financial incentives. A Servicer may
also encourage refinancing of defaulted Mortgage Loans, including Mortgage Loans
that would permit creditworthy borrowers to assume the outstanding indebtedness.
 
    The  Seller will  be obligated,  under certain  circumstances, to repurchase
certain of  the Mortgage  Loans. In  addition, if  specified in  the  applicable
Prospectus  Supplement, the Pooling and Servicing Agreement will permit, but not
require, the  Seller or  Master Servicer,  and the  terms of  certain  insurance
policies  relating to the  Mortgage Loans may permit  the applicable insurer, to
purchase any  Mortgage Loan  which  is in  default or  as  to which  default  is
reasonably  foreseeable. The proceeds of any such purchase or repurchase will be
deposited in the  related Certificate  Account and such  purchase or  repurchase
will  have the same effect as a prepayment in full of the related Mortgage Loan.
See "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans to  the
Trustee"  and "  -- Optional  Purchases." In  addition, if  so specified  in the
applicable  Prospectus  Supplement,  the  Master  Servicer  or  another   person
identified  therein will have the option to purchase all, but not less than all,
of the Mortgage Loans in any Trust Estate under the limited conditions specified
in such  Prospectus Supplement.  For any  Series of  Certificates for  which  an
election  has been  made to treat  the Trust  Estate (or one  or more segregated
pools of assets  therein) as a  REMIC, any  such purchase or  repurchase may  be
effected  only pursuant to a "qualified liquidation," as defined in Code Section
860F(a)(4)(A). See "The Pooling and Servicing Agreement -- Termination; Optional
Purchase of Mortgage Loans."
 
                        SERVICING OF THE MORTGAGE LOANS
 
    The following  is  a summary  of  certain provisions  of  the forms  of  the
Underlying Servicing Agreement and the Pooling and Servicing Agreement that have
been  filed as exhibits  to the Registration Statement  of which this Prospectus
forms a part. The summaries  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 and Servicing Agreement and Underlying Servicing Agreements for each
Series of Certificates and the applicable Prospectus Supplement.
 
THE MASTER SERVICER
 
    The Master Servicer  with respect  to each  Series of  Certificates will  be
Norwest  Bank. See "Norwest Bank" above.  The Master Servicer generally will (a)
be responsible under each Pooling and Servicing Agreement for providing  general
administrative  services for  the Trust Estate  for any  such Series, including,
among other things, (i) for administering and supervising the performance by the
Servicers of their  duties and responsibilities  under the Underlying  Servicing
Agreements,  (ii)  oversight  of  payments  received  on  Mortgage  Loans, (iii)
monitoring the amounts on deposit in various trust accounts, (iv) calculation of
the amounts  payable  to  Certificateholders  on  each  Distribution  Date,  (v)
preparation  of periodic reports  to the Trustee  or the Certificateholders with
respect to the  foregoing matters,  (vi) preparation of  federal and  applicable
state  and local tax  and information returns; (vii)  preparation of reports, if
any,  required   under   the  Securities   and   Exchange  Act   of   1934,   as
 
                                       41
<PAGE>
amended  and  (viii)  performing  certain  of  the  servicing  obligations  of a
terminated Servicer as described  below under "--  The Servicers"; (b)  maintain
any  mortgage pool insurance  policy, mortgagor bankruptcy  bond, special hazard
insurance policy  or other  form of  credit support  that may  be required  with
respect  to any Series and (c) make advances of delinquent payments of principal
and interest on the Mortgage Loans to the limited extent described herein  under
the  heading "Servicing of  Mortgage Loans --  Periodic Advances and Limitations
Thereon," if such  amounts are not  advanced by a  Servicer (other than  Norwest
Mortgage).  The Master Servicer will also perform additional duties as described
in the applicable Pooling and Servicing  Agreement. The Master Servicer will  be
entitled  to receive a  portion of the  interest payments on  the Mortgage Loans
included in the  Trust Estate  for such  a Series to  cover its  fees as  Master
Servicer. The Master Servicer may subcontract with Norwest Mortgage or any other
entity  the obligations of  the Master Servicer under  any Pooling and Servicing
Agreement. The  Master  Servicer  will  remain primarily  liable  for  any  such
contractor's performance in accordance with the applicable Pooling and Servicing
Agreement.  The Master Servicer may be  released from its obligations in certain
circumstances. See "Certain Matters Regarding the Master Servicer."
 
    The Master Servicer will generally be required to pay all expenses  incurred
in  connection with the  administration of the  Trust Estate, including, without
limitation, fees or other amounts  payable pursuant to any applicable  agreement
for  the  provision  of  credit  enhancement  for  such  Series,  the  fees  and
disbursements of the  Trustee and  any custodian,  fees due  to the  independent
accountants  and expenses incurred in  connection with distributions and reports
to Certificateholders.  Certain of  these expenses  may be  reimbursable to  the
Master  Servicer pursuant to  the terms of the  applicable Pooling and Servicing
Agreement.
 
    Each Prospectus Supplement relating  to such a  Series of Certificates  will
contain  information concerning  recent delinquency,  foreclosure and  loan loss
experience on  the  mortgage  loans included  in  Norwest  Mortgage's  servicing
portfolio  which were  originated or  acquired by  Norwest Mortgage  for its own
account or  for  the  account  of its  affiliates  ("Program  Loans"),  and,  if
available,  on those  Program Loans  having payment  terms generally  similar to
those of the Mortgage Loans  in the related Trust  Estate. If the related  Trust
Estate  contains  PHMC Mortgage  Loans,  the related  Prospectus  Supplement may
contain information concerning  PHMC's delinquency, foreclosure  and loans  loss
experience  prior to  the PHMC  Acquisition. Norwest  Mortgage's total servicing
portfolio of Program  Loans as  of any date  may include  (and PHMC's  servicing
portfolio included) loans having a variety of payment characteristics, including
adjustable  rate mortgage loans and loans subject to subsidy agreements, and the
overall delinquency, foreclosure and loan  loss experience of the Program  Loans
(or  PHMC-serviced mortgage loans) taken as a  whole may differ from that of the
Mortgage Loans contained  in any given  Trust Estate and  from that of  mortgage
servicers generally.
 
THE SERVICERS
 
    For  each  Series,  Norwest Mortgage  and,  if specified  in  the applicable
Prospectus  Supplement,  one  or  more  other  Servicers  will  provide  certain
customary  servicing  functions  with  respect  to  Mortgage  Loans  pursuant to
separate servicing  agreements  ("Underlying  Servicing  Agreements")  with  the
Seller or an affiliate thereof. The rights of the Seller or such affiliate under
the  applicable Underlying Servicing Agreements in respect of the Mortgage Loans
included in the Trust Estate for any  such Series will be assigned (directly  or
indirectly)  to the Trustee  for such Series.  The Servicers may  be entitled to
withhold  their  Servicing  Fees  and  certain  other  fees  and  charges   from
remittances of payments received on Mortgage Loans serviced by them.
 
    Each  Servicer generally will be approved by  FNMA or FHLMC as a servicer of
mortgage loans  and must  be approved  by the  Master Servicer.  In  determining
whether to approve a Servicer, the Master Servicer will review the credit of the
Servicer,  including capitalization  ratios, liquidity,  profitability and other
similar items that  indicate financial  ability to perform  its obligations.  In
addition, the
 
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Master  Servicer's  mortgage  servicing  personnel  will  review  the Servicer's
servicing record  and evaluate  the  ability of  the  Servicer to  conform  with
required  servicing procedures. Once a Servicer is approved, the Master Servicer
will continue to monitor on an annual basis the financial position and servicing
performance of the Servicer.
 
    The  duties  to  be  performed  by  each  Servicer  include  collection  and
remittance   of  principal  and   interest  payments  on   the  Mortgage  Loans,
administration of  mortgage escrow  accounts,  collection of  insurance  claims,
foreclosure  procedures, and, if  necessary, the advance of  funds to the extent
certain payments are not made by the  mortgagor and have not been determined  by
the  Servicer to be not recoverable under the applicable insurance policies with
respect to such Series, from proceeds  of liquidation of such Mortgage Loans  or
otherwise.  Each  Servicer  also  will  provide  such  accounting  and reporting
services as are  necessary to  enable the  Master Servicer  to provide  required
information  to the Trustee with  respect to the Mortgage  Loans included in the
Trust Estate for such Series. Each Servicer is entitled to a periodic  Servicing
Fee equal to a specified percentage of the outstanding principal balance of each
Mortgage  Loan  serviced  by  such  Servicer. With  the  consent  of  the Master
Servicer, any of  the servicing obligations  of a Servicer  may be delegated  to
another  person approved  by the Master  Servicer. In  addition, certain limited
duties of a Servicer may be delegated without consent.
 
    The Trustee, or if  so provided in the  applicable Servicing Agreement,  the
Master  Servicer, may  terminate a  Servicer who has  failed to  comply with its
covenants or breached  one of  its representations contained  in the  Underlying
Servicing  Agreement or  in certain other  circumstances. Upon  termination of a
Servicer by  the  Master  Servicer,  the Master  Servicer  will  assume  certain
servicing obligations of the terminated Servicer, or, at its option, may appoint
a  substitute Servicer acceptable to the  Trustee (which substitute Servicer may
be Norwest  Mortgage) to  assume  the servicing  obligations of  the  terminated
Servicer.  The Master Servicer's obligations to  act as a servicer following the
termination of an Underlying Servicing Agreement will not, however, require  the
Master  Servicer to (i) purchase a Mortgage Loan  from the Trust Estate due to a
breach by  such Servicer  of a  representation or  warranty in  respect of  such
Mortgage Loan or (ii) with respect to a default by Norwest Mortgage as Servicer,
advance payments of principal and interest on a delinquent Mortgage Loan.
 
PAYMENTS ON MORTGAGE LOANS
 
    The  Master Servicer will, as to  each Series of Certificates, establish and
maintain a separate trust account in  the name of the Trustee (the  "Certificate
Account").  Such  account may  be established  at Norwest  Bank or  an affiliate
thereof. Each  such account  must be  maintained with  a depository  institution
("Depository") either (i) whose long-term debt obligations (or, in the case of a
depository  institution  which  is  part of  a  holding  company  structure, the
long-term debt obligations of such parent  holding company) are, at the time  of
any  deposit therein rated in at least  one of the two highest rating categories
by each nationally  recognized statistical  rating organization  that rated  the
related  Series of  Certificates, or  (ii) that  is otherwise  acceptable to the
Rating Agency or Rating Agencies rating the Certificates of such Series and,  if
a  REMIC election has been  made, that would not  cause the related Trust Estate
(or one or  more segregated pools  of assets therein)  to fail to  qualify as  a
REMIC.  To the  extent that  the portion of  funds deposited  in the Certificate
Account at any time exceeds the  limit of insurance coverage established by  the
Federal  Deposit Insurance Corporation (the "FDIC"), such excess will be subject
to loss in the event of the  failure of the Depository. Such insurance  coverage
will  be based on the number of  holders of Certificates, rather than the number
of underlying mortgagors. Holders of  the Subordinated Certificates of a  Series
will  bear any such loss  up to the amount of  principal payments on the related
Mortgage Loans to which such holders are entitled.
 
    Pursuant to the applicable Underlying Servicing Agreements with respect to a
Series, each Servicer  will be required  to establish and  maintain one or  more
accounts  (collectively,  the  "Servicer  Custodial  Account")  into  which  the
Servicer will be  required to  deposit on a  daily basis  amounts received  with
respect to Mortgage Loans serviced by such Servicer included in the Trust Estate
for  such Series, as more fully described below. Each Servicer Custodial Account
must be a separate custodial account insured to the available limits by the FDIC
and limited  to funds  held with  respect  to a  particular Series,  unless  the
Underlying   Servicing  Agreement  specifies  that   a  Servicer  may  establish
 
                                       43
<PAGE>
an account  which  is  an  eligible account  meeting  the  requirements  of  the
applicable  Rating  Agencies (an  "Eligible Custodial  Account")  to serve  as a
unitary Servicer Custodial Account both for such Series and for other Series  of
Certificates  for which Norwest Bank is the  Master Servicer and having the same
financial institution acting as Trustee and to be maintained in the name of such
financial institution, in  its respective  capacities as Trustee  for each  such
Series.
 
    Each  Servicer will  be required to  deposit in the  Certificate Account for
each Series of Certificates on the date the Certificates are issued any  amounts
representing  scheduled payments of principal and interest on the Mortgage Loans
serviced by such Servicer due after the applicable Cut-Off Date but received  on
or  prior  thereto,  and  except  as specified  in  the  applicable  Pooling and
Servicing Agreement  or  Underlying Servicing  Agreement,  will deposit  in  the
Servicer  Custodial Account on receipt and,  thereafter, not later than the 24th
calendar day  of each  month or  such earlier  day as  may be  specified in  the
Underlying Servicing Agreement (the "Remittance Date"), will remit to the Master
Servicer  for deposit  in the  Certificate Account,  the following  payments and
collections received or made by such Servicer with respect to the Mortgage Loans
serviced by such Servicer subsequent to the applicable Cut-Off Date (other  than
(x)  payments due on or before the Cut-Off  Date and (y) amounts held for future
distribution):
 
           (i)
           all payments  on account  of  principal, including  prepayments,  and
           interest;
 
          (ii)
           all   amounts  received  by  the  Servicer  in  connection  with  the
           liquidation of  defaulted  Mortgage  Loans or  property  acquired  in
    respect  thereof, whether  through foreclosure sale  or otherwise, including
    payments in  connection  with defaulted  Mortgage  Loans received  from  the
    mortgagor  other than amounts required to  be paid to the mortgagor pursuant
    to the terms of  the applicable Mortgage Loan  or otherwise pursuant to  law
    ("Liquidation  Proceeds") less, to the extent permitted under the applicable
    Underlying Servicing  Agreement,  the amount  of  any expenses  incurred  in
    connection with the liquidation of such Mortgage Loans;
 
         (iii)
           all  proceeds received  by the  Servicer under  any title,  hazard or
           other insurance policy  covering any such  Mortgage Loan, other  than
    proceeds  to be applied to the restoration or repair of the property subject
    to the related Mortgage or released to the mortgagor in accordance with  the
    Underlying Servicing Agreement;
 
          (iv)
           all Periodic Advances made by the Servicer;
 
           (v)
           all  amounts withdrawn from Buy-Down Funds  or Subsidy Funds, if any,
           with respect to such Mortgage Loans, in accordance with the terms  of
    the respective agreements applicable thereto;
 
          (vi)
           all  proceeds  of any  such Mortgage  Loans  or property  acquired in
           respect thereof purchased or repurchased pursuant to the Pooling  and
    Servicing Agreement or the Underlying Servicing Agreement; and
 
         (vii)
           all  other amounts required  to be deposited  therein pursuant to the
           applicable  Pooling  and  Servicing   Agreement  or  the   Underlying
    Servicing Agreement.
 
    Notwithstanding  the foregoing, if at any time  the sums in (x) any Servicer
Custodial Account, other than any Eligible Custodial Account, exceed $100,000 or
(y) any such Servicer Custodial  Account, in certain circumstances, exceed  such
amount  less than $100,000 as shall have  been specified by the Master Servicer,
the Servicer will be  required within one business  day to withdraw such  excess
funds from such account and remit such amounts to the Certificate Account.
 
    Notwithstanding  the  foregoing,  each  Servicer will  be  entitled,  at its
election, either (a)  to withhold and  pay itself the  applicable Servicing  Fee
from  any payment or other recovery on account of interest as received and prior
to deposit  in  the Servicer  Custodial  Account or  (b)  to withdraw  from  the
Servicer Custodial Account the applicable Servicing Fee after the entire payment
or recovery has been deposited in such account.
 
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<PAGE>
    The  Master Servicer or Trustee will  deposit in the Certificate Account any
Periodic Advances made  by the  Master Servicer  or Trustee  in the  event of  a
Servicer  default not later than the Distribution Date on which such amounts are
required to  be  distributed.  All  other  amounts  will  be  deposited  in  the
Certificate  Account not later than  the business day next  following the day of
receipt and posting by the Master Servicer. On or before each Distribution Date,
the Master Servicer will withdraw from the Certificate Account and remit to  the
Trustee for distribution to Certificateholders all amounts allocable to the Pool
Distribution Amount for such Distribution Date.
 
    If  a  Servicer,  the  Master  Servicer  or  the  Trustee  deposits  in  the
Certificate Account  for  a Series  any  amount  not required  to  be  deposited
therein,  the Master  Servicer may  at any time  withdraw such  amount from such
account for  itself  or for  remittance  to such  Servicer  or the  Trustee,  as
applicable.  Funds  on deposit  in the  Certificate Account  may be  invested in
certain investments acceptable to  the Rating Agencies ("Eligible  Investments")
maturing  in  general  not  later  than  the  business  day  preceding  the next
Distribution Date. In  the event that  an election  has been made  to treat  the
Trust Estate (or one or more segregated pools of assets therein) with respect to
a Series as a REMIC, no such Eligible Investments will be sold or disposed of at
a  gain prior to maturity unless the  Master Servicer has received an opinion of
counsel or other evidence satisfactory to it that such sale or disposition  will
not  cause the Trust Estate (or segregated pool  of assets) to be subject to the
tax on "prohibited transactions" imposed  by Code Section 860F(a)(1),  otherwise
subject  the Trust Estate  (or segregated pool  of assets) to  tax, or cause the
Trust Estate (or any segregated  pool of assets) to fail  to qualify as a  REMIC
while  any  Certificates  of the  Series  are outstanding.  Except  as otherwise
specified in the applicable Prospectus Supplement, all income and gain  realized
from  any such  investment will  be for  the account  of the  Master Servicer as
additional compensation  and  all  losses  from  any  such  investment  will  be
deposited by the Master Servicer out of its own funds to the Certificate Account
immediately as realized.
 
    The  Master Servicer  is permitted, from  time to time,  to make withdrawals
from the Certificate Account for the following purposes, to the extent permitted
in the applicable Pooling and Servicing Agreement (and, in the case of  Servicer
reimbursements  by  the  Master  Servicer,  only  to  the  extent  funds  in the
respective Servicer Custodial Account are not sufficient therefor):
 
           (i)
           to reimburse the  Master Servicer,  the Trustee or  any Servicer  for
           Advances;
 
          (ii)
           to  reimburse any Servicer  for liquidation expenses  and for amounts
           expended by itself or any Servicer, as applicable, in connection with
    the restoration of damaged property;
 
         (iii)
           to pay to itself  the applicable Master Servicing  Fee and any  other
           amounts constituting additional master servicing compensation, to pay
    the  Trustee the applicable Trustee Fee, to  pay any other fees described in
    the applicable Prospectus Supplement;  and to pay to  the owner thereof  any
    Fixed Retained Yield;
 
          (iv)
           to  reimburse itself or any  Servicer for certain expenses (including
           taxes paid on behalf of the Trust Estate) incurred by and recoverable
    by or reimbursable to itself or the Servicer, as applicable;
 
           (v)
           to pay  to the  Seller, a  Servicer or  itself with  respect to  each
           Mortgage  Loan or property acquired in  respect thereof that has been
    repurchased by the Seller or purchased by a Servicer or the Master  Servicer
    all  amounts received thereon and not distributed as of the date as of which
    the purchase price of such Mortgage Loan was determined;
 
          (vi)
           to pay to itself any interest  earned on or investment income  earned
           with  respect to funds in the  Certificate Account (all such interest
    or income to be withdrawn not later than the next Distribution Date);
 
                                       45
<PAGE>
         (vii)
           to pay to itself, the Servicer  and the Trustee from net  Liquidation
           Proceeds  allocable  to interest,  the  amount of  any  unpaid Master
    Servicing Fee,  Servicing Fees  or Trustee  Fees and  any unpaid  assumption
    fees,  late  payment  charges  or other  mortgagor  charges  on  the related
    Mortgage Loan;
 
        (viii)
           to withdraw from the Certificate Account any amount deposited in such
           account that was not required to be deposited therein; and
 
          (ix)
           to clear and terminate the Certificate Account.
 
    The Master  Servicer will  be  authorized to  appoint  a paying  agent  (the
"Paying  Agent") to  make distributions,  as agent  for the  Master Servicer, to
Certificateholders of a Series. If the Paying Agent for a Series is the  Trustee
of  such Series, such Paying  Agent will be authorized  to make withdrawals from
the Certificate Account in order to make distributions to Certificateholders. If
the Paying Agent for  a Series is  not the Trustee for  such Series, the  Master
Servicer will, on each Distribution Date, deposit in immediately available funds
in  an account  designated by any  such Paying  Agent the amount  required to be
distributed to the Certificateholders on such Distribution Date.
 
    The Master Servicer will cause any Paying  Agent that is not the Trustee  to
execute  and deliver  to the  Trustee an instrument  in which  such Paying Agent
agrees with the Trustee that such Paying Agent will:
 
       (1) hold all  amounts  deposited  with  it by  the  Master  Servicer  for
           distribution  to  Certificateholders  in  trust  for  the  benefit of
    Certificateholders until such amounts are distributed to  Certificateholders
    or otherwise disposed of as provided in the applicable Pooling and Servicing
    Agreement;
 
       (2) give  the Trustee notice of any default by the Master Servicer in the
           making of such deposit; and
 
       (3) at any time during the continuance of any such default, upon  written
           request to the Trustee, forthwith pay to the Trustee all amounts held
    in trust by such Paying Agent.
 
PERIODIC ADVANCES AND LIMITATIONS THEREON
 
    Generally  each Servicer will  be required to make  (i) Periodic Advances to
cover delinquent payments of  principal and interest on  such Mortgage Loan  and
(ii)  other advances of  cash ("Other Advances"  and, collectively with Periodic
Advances, "Advances")  to  cover (x)  delinquent  payments of  taxes,  insurance
premiums,   and  other  escrowed  items  and  (y)  rehabilitation  expenses  and
foreclosure costs, including reasonable attorneys'  fees, in either case  unless
such  Servicer has determined that any subsequent payments on that Mortgage Loan
or from the borrower will ultimately not be available to reimburse such Servicer
for such amounts.  The failure  of the Servicer  to make  any required  Periodic
Advances or Other Advances under an Underlying Servicing Agreement constitutes a
default  under such  agreement for which  the Servicer will  be terminated. Upon
default by a Servicer, other than Norwest Mortgage, the Master Servicer may, and
upon default by Norwest Mortgage the Trustee may, in each case if so provided in
the Pooling and Servicing  Agreement, be required to  make Periodic Advances  to
the  extent necessary to make required  distributions on certain Certificates or
certain Other  Advances,  provided  that  the Master  Servicer  or  Trustee,  as
applicable,  determines that funds will ultimately be available to reimburse it.
In the  case of  Certificates of  any  Series for  which credit  enhancement  is
provided  in the form of a mortgage pool insurance policy, the Seller may obtain
an endorsement to the  mortgage pool insurance policy  which obligates the  Pool
Insurer  to  advance delinquent  payments of  principal  and interest.  The Pool
Insurer would  only  be obligated  under  such  endorsement to  the  extent  the
mortgagor fails to make such payment and the Master Servicer or Trustee fails to
make a required advance.
 
    The  advance obligation  of the Master  Servicer and Trustee  may be further
limited to an amount specified by the Rating Agency rating the Certificates. Any
such Periodic Advances by  the Servicers or the  Master Servicer or Trustee,  as
the   case   may   be,  must   be   deposited  into   the   applicable  Servicer
 
                                       46
<PAGE>
Custodial Account or the Certificate Account and  will be due no later than  the
business  day  before the  Distribution Date  to  which such  delinquent payment
relates. Advances by  the Servicers or  the Master Servicer  or Trustee, as  the
case  may  be, will  be reimbursable  out of  insurance proceeds  or Liquidation
Proceeds of, or,  except for Other  Advances, future payments  on, the  Mortgage
Loans  for which such amounts  were advanced. If an  Advance made by a Servicer,
the Master Servicer  or the Trustee  later proves,  or is deemed  by the  Master
Servicer or the Trustee, to be unrecoverable, such Servicer, the Master Servicer
or the Trustee, as the case may be, will be entitled to reimbursement from funds
in  the  Certificate  Account  prior  to the  distribution  of  payments  to the
Certificateholders  to  the  extent  provided  in  the  Pooling  and   Servicing
Agreement.
 
    Any Periodic Advances made by a Servicer, the Master Servicer or the Trustee
with  respect to Mortgage Loans included in  the Trust Estate for any Series are
intended to  enable  the  Trustee  to  make  timely  payment  of  the  scheduled
distributions  of principal  and interest  on the  Certificates of  such Series.
However, neither the Master  Servicer, the Trustee, any  Servicer nor any  other
person  will,  except  as  otherwise  specified  in  the  applicable  Prospectus
Supplement, insure or guarantee the Certificates  of any Series or the  Mortgage
Loans included in the Trust Estate for any Certificates.
 
COLLECTION AND OTHER SERVICING PROCEDURES
 
    Each Servicer will be required by the related Underlying Servicing Agreement
to make reasonable efforts to collect all payments called for under the Mortgage
Loans and, consistent with the applicable Underlying Servicing Agreement and any
applicable  agreement governing any  form of credit  enhancement, to follow such
collection procedures as it follows with  respect to mortgage loans serviced  by
it  that are comparable  to the Mortgage  Loans. Consistent with  the above, the
Servicer may, in  its discretion,  (i) waive any  prepayment charge,  assumption
fee,  late payment charge or any other  charge in connection with the prepayment
of a  Mortgage  Loan and  (ii)  arrange with  a  mortgagor a  schedule  for  the
liquidation  of deficiencies running for not more  than 180 days (or such longer
period to which the Master Servicer  and any applicable Pool Insurer or  primary
mortgage insurer have consented) after the applicable Due Date.
 
    Under  each  Underlying Servicing  Agreement, each  Servicer, to  the extent
permitted by law, will establish and maintain one or more escrow accounts  (each
such  account,  a  "Servicing Account")  in  which  each such  Servicer  will be
required to  deposit any  payments  made by  mortgagors  in advance  for  taxes,
assessments,  primary mortgage (if applicable) and hazard insurance premiums and
other similar  items. Withdrawals  from the  Servicing Account  may be  made  to
effect  timely payment of taxes, assessments,  mortgage and hazard insurance, to
refund to  mortgagors amounts  determined to  be overages,  to pay  interest  to
mortgagors  on balances in the Servicing Account,  if required, and to clear and
terminate such account. Each Servicer will be responsible for the administration
of its  Servicing Account.  A  Servicer will  be  obligated to  advance  certain
amounts  which are  not timely  paid by  the mortgagors,  to the  extent that it
determines, in  good faith,  that  they will  be  recoverable out  of  insurance
proceeds,   liquidation  proceeds,  or  otherwise.  Alternatively,  in  lieu  of
establishing a Servicing Account, a Servicer  may procure a performance bond  or
other form of insurance coverage, in an amount acceptable to the Master Servicer
and  each Rating Agency rating the related Series of Certificates, covering loss
occasioned by the failure to escrow such amounts.
 
ENFORCEMENT OF DUE-ON-SALE CLAUSES; REALIZATION UPON DEFAULTED MORTGAGE LOANS
 
    With respect  to  each Mortgage  Loan  having  a fixed  interest  rate,  the
applicable  Underlying Servicing Agreement will generally provide that, when any
Mortgaged Property is about to be conveyed by the mortgagor, the Servicer  will,
to  the extent  it has  knowledge of  such prospective  conveyance, exercise its
rights to accelerate the maturity of such Mortgage Loan under the  "due-on-sale"
clause applicable thereto, if any, unless it is not exercisable under applicable
law  or if such exercise would result in loss of insurance coverage with respect
to such Mortgage Loan or would, in the Servicer's judgment, be reasonably likely
to result in litigation by the mortgagor and such Servicer has not obtained  the
Master  Servicer's consent  to such  exercise. In  either case,  the Servicer is
authorized to take or enter into  an assumption and modification agreement  from
or with the person to whom such
 
                                       47
<PAGE>
Mortgaged  Property has been or is about  to be conveyed, pursuant to which such
person becomes  liable  under  the  Mortgage  Note  and,  unless  prohibited  by
applicable  state law, the  mortgagor remains liable  thereon, provided that the
Mortgage Loan will continue to be covered  by any pool insurance policy and  any
related  primary mortgage insurance  policy and the  Mortgage Interest Rate with
respect to such Mortgage Loan and the payment terms shall remain unchanged.  The
Servicer  will also be authorized,  with the prior approval  of the pool insurer
and the  primary mortgage  insurer, if  any,  to enter  into a  substitution  of
liability  agreement with such person, pursuant  to which the original mortgagor
is released  from liability  and such  person is  substituted as  mortgagor  and
becomes liable under the Mortgage Note.
 
    Each Underlying Servicing Agreement and Pooling and Servicing Agreement with
respect  to a Series  will require the  Servicer or the  Master Servicer, as the
case may  be,  to present  claims  to the  insurer  under any  insurance  policy
applicable  to the Mortgage Loans  included in the Trust  Estate for such Series
and to take such reasonable steps as are necessary to permit recovery under such
insurance policies with respect  to defaulted Mortgage Loans,  or losses on  the
Mortgaged Property securing the Mortgage Loans.
 
    Each  Servicer  is  obligated  under  the  applicable  Underlying  Servicing
Agreement for each Series to realize upon defaulted Mortgage Loans in accordance
with its normal servicing  practices, which will conform  generally to those  of
prudent  mortgage lending institutions which service  mortgage loans of the same
type in the same jurisdictions.  Notwithstanding the foregoing, the Servicer  is
authorized  under the  applicable Underlying  Servicing Agreement  to permit the
assumption of a  defaulted Mortgage Loan  rather than to  foreclose or accept  a
deed-in-lieu  of  foreclosure if,  in the  Servicer's  judgment, the  default is
unlikely to  be  cured  and  the  assuming  borrower  meets  Norwest  Mortgage's
applicable  underwriting guidelines. In connection with any such assumption, the
Mortgage Interest Rate and the payment  terms of the related Mortgage Note  will
not be changed. Each Servicer may also, with the consent of the Master Servicer,
modify  the payment terms of Mortgage Loans that  are in default, or as to which
default is reasonably foreseeable, that remain  in the Trust Estate rather  than
foreclose  on  such Mortgage  Loans; provided  that  no such  modification shall
forgive principal  owing under  such  Mortgage Loan  or permanently  reduce  the
interest  rate on such  Mortgage Loan. Any  such modification will  be made only
upon the  determination  by the  Servicer  and  the Master  Servicer  that  such
modification  is likely to increase the proceeds  of such Mortgage Loan over the
amount expected to be collected pursuant  to foreclosure. See also "The  Pooling
and  Servicing  Agreement --  Optional Purchases,"  above,  with respect  to the
Seller's right to repurchase Mortgage Loans that are in default, or as to  which
default  is  reasonably  foreseeable.  Further,  a  Servicer  may  encourage the
refinancing of  such defaulted  Mortgage Loans,  including Mortgage  Loans  that
would permit creditworthy borrowers to assume the outstanding indebtedness.
 
    In  the case  of foreclosure or  of damage  to a Mortgaged  Property from an
uninsured cause, the Servicer will  not be required to  expend its own funds  to
foreclose  or restore any damaged property,  unless it reasonably determines (i)
that  such   foreclosure  or   restoration  will   increase  the   proceeds   to
Certificateholders  of such  Series of  liquidation of  the Mortgage  Loan after
reimbursement to  the related  Servicer  for its  expenses  and (ii)  that  such
expenses  will  be  recoverable  to  it  through  Liquidation  Proceeds  or  any
applicable insurance policy in respect of such Mortgage Loan. In the event  that
Servicer  has  expended its  own  funds for  foreclosure  or to  restore damaged
property, it will be entitled to be reimbursed from the Certificate Account  for
such Series an amount equal to all costs and expenses incurred by it.
 
    Norwest  Mortgage will not be obligated to,  and any other Servicer will not
(except with the express written approval of the Master Servicer), foreclose  on
any Mortgaged Property which it believes may be contaminated with or affected by
hazardous  wastes or  hazardous substances.  See "Certain  Legal Aspects  of the
Mortgage  Loans  --  Environmental  Considerations."  If  a  Servicer  does  not
foreclose  on a Mortgaged Property, the Certificateholders of the related Series
may experience a  loss on  the related  Mortgage Loan.  A Servicer  will not  be
liable  to  the  Certificateholders if  it  fails  to foreclose  on  a Mortgaged
Property which it  believes may  be so contaminated  or affected,  even if  such
 
                                       48
<PAGE>
Mortgaged  Property is, in fact, not  so contaminated or affected. Conversely, a
Servicer will not be  liable to the Certificateholders  if, based on its  belief
that  no  such contamination  or  effect exists,  the  Servicer forecloses  on a
Mortgaged Property and takes  title to such  Mortgaged Property, and  thereafter
such Mortgaged Property is determined to be so contaminated or affected.
 
    The  Servicer may foreclose  against property securing  a defaulted Mortgage
Loan either by foreclosure, by sale or by strict foreclosure and in the event  a
deficiency  judgment is  available against  the mortgagor  or other  person (see
"Certain Legal Aspects of the Mortgage Loans -- Anti-Deficiency Legislation  and
Other Limitations on Lenders" for a discussion of the availability of deficiency
judgments), may proceed for the deficiency. It is anticipated that in most cases
the  Servicer will not seek deficiency judgments, and will not be required under
the applicable Underlying Servicing Agreement  to seek deficiency judgments.  In
lieu  of foreclosure, each Servicer may arrange  for the sale by the borrower of
the Mortgaged Property related  to a defaulted Mortgage  Loan to a third  party,
rather than foreclosing upon and selling such Mortgaged Property.
 
    With respect to a Trust Estate (or any segregated pool of assets therein) as
to  which a REMIC election  has been made, if  the Trustee acquires ownership of
any Mortgaged  Property as  a  result of  a  default or  reasonably  foreseeable
default  of any Mortgage Loan secured by such Mortgaged Property, the Trustee or
Master Servicer will be  required to dispose of  such property within two  years
following its acquisition by the Trust Estate unless the Trustee (a) receives an
opinion  of counsel to the effect that  the holding of the Mortgaged Property by
the Trust Estate will  not cause the Trust  Estate to be subject  to the tax  on
"prohibited  transactions" imposed by Code Section 860F(a)(1) or cause the Trust
Estate (or any segregated pool of assets  therein as to which one or more  REMIC
elections  have been made or will be made) to  fail to qualify as a REMIC or (b)
applies for and is  granted an extension  of the two-year  period in the  manner
contemplated  by Code Section  856(e)(3). The Servicer also  will be required to
administer the Mortgaged Property in a manner which does not cause the Mortgaged
Property to fail to qualify as "foreclosure property" within the meaning of Code
Section 860G(a)(8) or  result in the  receipt by  the Trust Estate  of any  "net
income from foreclosure property" within the meaning of Code Section 860G(c)(2),
respectively.  In  general, this  would preclude  the  holding of  the Mortgaged
Property by a party acting as a dealer in such property or the receipt of rental
income based on the profits of the lessee of such property. See "Certain Federal
Income Tax Consequences."
 
INSURANCE POLICIES
 
    Each Underlying Servicing  Agreement will  require the  related Servicer  to
cause to be maintained for each Mortgage Loan a standard hazard insurance policy
issued  by  a  generally acceptable  insurer  insuring the  improvements  on the
Mortgaged Property  underlying such  Mortgage Loan  against loss  by fire,  with
extended  coverage  (a  "Standard  Hazard  Insurance  Policy").  The  Underlying
Servicing Agreements will require that such Standard Hazard Insurance Policy  be
in  an amount at least equal to the lesser of 100% of the insurable value of the
improvements on the Mortgaged Property or the principal balance of such Mortgage
Loan; provided, however, that  such insurance may not  be less than the  minimum
amount required to fully compensate for any damage or loss on a replacement cost
basis.  Each Servicer will also maintain  on property acquired upon foreclosure,
or deed  in  lieu  of foreclosure,  of  any  Mortgage Loan,  a  Standard  Hazard
Insurance  Policy in an amount that  is at least equal to  the lesser of 100% of
the insurable value of the improvements which are a part of such property or the
principal balance of such  Mortgage Loan plus  accrued interest and  liquidation
expenses;  provided,  however, that  such  insurance may  not  be less  than the
minimum amount  required  to  fully compensate  for  any  damage or  loss  on  a
replacement  cost basis.  Any amounts collected  under any  such policies (other
than amounts  to  be applied  to  the restoration  or  repair of  the  Mortgaged
Property  or  released  to  the borrower  in  accordance  with  normal servicing
procedures) will be deposited in  the Servicer Custodial Account for  remittance
to the Certificate Account by a Servicer.
 
    The Standard Hazard Insurance Policies covering the Mortgage Loans generally
will  cover  physical damage  to,  or destruction  of,  the improvements  on the
Mortgaged Property caused by fire, lightning, explosion, smoke, windstorm, hail,
riot, strike  and civil  commotion,  subject to  the conditions  and  exclusions
particularized  in each policy.  Because the Standard  Hazard Insurance Policies
 
                                       49
<PAGE>
relating to such Mortgage Loans will  be underwritten by different insurers  and
will  cover Mortgaged Properties  located in various  states, such policies will
not contain identical terms and conditions. The most significant terms  thereof,
however,  generally  will  be determined  by  state  law and  generally  will be
similar. Most  such  policies  typically  will 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  mudflows), nuclear  reaction, wet or  dry rot, vermin,  rodents, insects or
domestic animals,  hazardous  wastes  or hazardous  substances,  theft  and,  in
certain  cases, vandalism.  The foregoing list  is merely  indicative of certain
kinds of uninsured risks and is not all-inclusive.
 
    In general, if the  improvements on a Mortgaged  Property are located in  an
area  identified in  the Federal  Register by  the Federal  Emergency Management
Agency as having special flood hazards  (and such flood insurance has been  made
available) each Underlying Servicing Agreement will require the related Servicer
to  cause to be maintained a flood  insurance policy meeting the requirements of
the current guidelines of the Federal Insurance Administration with a  generally
acceptable insurance carrier. Generally, the Underlying Servicing Agreement will
require that such flood insurance be in an amount not less than the least of (i)
the  outstanding principal balance of the Mortgage Loan, (ii) the full insurable
value of the  improvements, or (iii)  the maximum amount  of insurance which  is
available  under the Flood Disaster Protection  Act of 1973, as amended. Norwest
Mortgage does  not  provide  financing  for flood  zone  properties  located  in
communities  not participating  in the  National Flood  Insurance Program  or if
available insurance coverage is, in its judgment, unrealistically low.
 
    Each Servicer may maintain a  blanket policy insuring against hazard  losses
on  all of the Mortgaged Properties in lieu of maintaining the required Standard
Hazard Insurance Policies  and may  maintain a blanket  policy insuring  against
special  hazards  in  lieu of  maintaining  any required  flood  insurance. Each
Servicer will be liable for the amount of any deductible under a blanket  policy
if  such amount would have been covered  by a required Standard Hazard Insurance
Policy or flood insurance, had it been maintained.
 
    Any losses incurred with  respect to Mortgage Loans  due to uninsured  risks
(including  earthquakes,  mudflows,  floods and  hazardous  wastes  or hazardous
substances) or  insufficient hazard  insurance  proceeds will  adversely  affect
distributions to the Certificateholders.
 
FIXED RETAINED YIELD, SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    Fixed  Retained Yield with respect to any  Mortgage Loan is that portion, if
any, of interest  at the  Mortgage Interest  Rate that  is not  included in  the
related  Trust  Estate.  The Prospectus  Supplement  for a  Series  will specify
whether there is any Fixed Retained Yield with respect to the Mortgage Loans  of
such  Series.  If  so,  the  Fixed  Retained  Yield  will  be  established  on a
loan-by-loan basis  and will  be specified  in the  schedule of  Mortgage  Loans
attached  as  an  exhibit to  the  applicable Pooling  and  Servicing Agreement.
Norwest Mortgage as Servicer may deduct the Fixed Retained Yield from  mortgagor
payments  as received or deposit such payments in the Servicer Custodial Account
or Certificate  Account for  such  Series and  then  either withdraw  the  Fixed
Retained  Yield from  the Servicer Custodial  Account or  Certificate Account or
request the  Master Servicer  to  withdraw the  Fixed  Retained Yield  from  the
Certificate Account for remittance to Norwest Mortgage. In the case of any Fixed
Retained  Yield with respect to Mortgage Loans serviced by a Servicer other than
Norwest Mortgage, the Master Servicer will make withdrawals from the Certificate
Account for the purpose of remittances to Norwest Mortgage as owner of the Fixed
Retained Yield. Notwithstanding the  foregoing, with respect  to any payment  of
interest  received by Norwest  Mortgage as Servicer relating  to 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 then due
with respect to such Mortgage Loan, the  owner of the Fixed Retained Yield  with
respect  to  such Mortgage  Loan  will bear  a  ratable share  of  such interest
shortfall.
 
    For each Series of Certificates, each  Servicer will be entitled to be  paid
the  Servicing Fee on the related Mortgage Loans serviced by such Servicer until
termination of the applicable Underlying
 
                                       50
<PAGE>
Servicing Agreement. A Servicer, at its election, will pay itself the  Servicing
Fee  for a  Series with  respect to  each Mortgage  Loan by  (a) withholding the
Servicing Fee from any  scheduled payment of interest  prior to deposit of  such
payment in the Servicer Custodial Account for such Series or (b) withdrawing the
Servicing  Fee from  the Servicer  Custodial Account  after the  entire interest
payment has been deposited in such account.  A Servicer may also pay itself  out
of  the Liquidation Proceeds of a Mortgage Loan or other recoveries with respect
thereto, or withdraw from the Servicer  Custodial Account or request the  Master
Servicer to withdraw from the Certificate Account for remittance to the Servicer
such  amounts after the deposit thereof in such accounts, or if such Liquidation
Proceeds or other recoveries are insufficient, from Net Foreclosure Profits with
respect to the related  Distribution Date the Servicing  Fee in respect of  such
Mortgage  Loan to  the extent provided  in the applicable  Pooling and Servicing
Agreement. The Servicing Fee or the range of Servicing Fees with respect to  the
Mortgage  Loans underlying the Certificates of a Series will be specified in the
applicable Prospectus Supplement. Additional servicing compensation in the  form
of  prepayment charges, assumption fees, late  payment charges or otherwise will
be retained by the Servicers.
 
    Each Servicer  will  pay  all  expenses  incurred  in  connection  with  the
servicing  of the Mortgage Loans serviced  by such Servicer underlying a Series,
including, without limitation, payment of the hazard insurance policy  premiums.
The  Servicer will be entitled, in  certain circumstances, to reimbursement from
the Certificate Account of  Periodic Advances, of Other  Advances made by it  to
pay  taxes, insurance premiums  and similar items with  respect to any Mortgaged
Property or for expenditures incurred by it in connection with the  restoration,
foreclosure  or  liquidation  of  any  Mortgaged  Property  (to  the  extent  of
Liquidation Proceeds or insurance policy  proceeds in respect of such  Mortgaged
Property)  and of certain  losses against which  it is indemnified  by the Trust
Estate.
 
    As set  forth in  the preceding  paragraph, a  Servicer may  be entitled  to
reimbursement  for certain  expenses incurred by  it, and  payment of additional
fees for certain extraordinary services rendered by it (provided that such  fees
do  not  exceed  those which  would  be  charged by  third  parties  for similar
services) in connection  with the  liquidation of defaulted  Mortgage Loans  and
related  Mortgaged Properties. In the  event that claims are  either not made or
are not fully paid from any  applicable form of credit enhancement, the  related
Trust  Estate will suffer a loss to  the extent that Liquidation Proceeds, after
reimbursement of the Servicing  Fee and the expenses  of the Servicer, are  less
than the principal balance of the related Mortgage Loan.
 
EVIDENCE AS TO COMPLIANCE
 
    Each  Servicer will deliver  annually to the Trustee  or Master Servicer, as
applicable, on  or  before  the  date specified  in  the  applicable  Underlying
Servicing  Agreement, an Officer's Certificate stating  that (i) a review of the
activities  of  such  Servicer  during  the  preceding  calendar  year  and   of
performance  under the applicable  Underlying Servicing Agreement  has been made
under the supervision of such  officer, and (ii) to  the best of such  officer's
knowledge, based on such review, such Servicer has fulfilled all its obligations
under the applicable Underlying Servicing Agreement throughout such year, or, if
there  has been a default in the  fulfillment of any such obligation, specifying
each such default known to such officer and the nature and status thereof.  Such
Officer's  Certificate  shall  be  accompanied  by  a  statement  of  a  firm of
independent  public  accountants  to  the  effect  that,  on  the  basis  of  an
examination  of certain documents and records relating to a random sample of the
mortgage loans  being serviced  by  such Servicer  pursuant to  such  Underlying
Servicing  Agreement and/or other similar agreements, conducted substantially in
compliance with  the Uniform  Single  Audit Program  for Mortgage  Bankers,  the
servicing of such mortgage loans was conducted in compliance with the provisions
of  the applicable Underlying Servicing  Agreement and other similar agreements,
except for (i) such exceptions as such  firm believes to be immaterial and  (ii)
such other exceptions as are set forth in such statement.
 
    The  Master Servicer will deliver annually to  the Trustee, on or before the
date specified in the applicable  Pooling and Servicing Agreement, an  Officer's
Certificate stating that such officer has
 
                                       51
<PAGE>
received,   with  respect  to  each  Servicer,  the  Officer's  Certificate  and
accountant's statement described in  the preceding paragraph,  and, that on  the
basis  of such officer's review of such information, each Servicer has fulfilled
all  its  obligations  under  the  applicable  Underlying  Servicing   Agreement
throughout  such year, or, if there has been a default in the fulfillment of any
such obligation, specifying  each such  default known  to such  officer and  the
nature and status thereof.
 
                 CERTAIN MATTERS REGARDING THE MASTER SERVICER
 
    The Master Servicer may not resign from its obligations and duties under the
Pooling  and  Servicing Agreement  for each  Series without  the consent  of the
Trustee, except upon its determination that its duties thereunder are no  longer
permissible  under  applicable law  or  are in  material  conflict by  reason of
applicable law with any other activities of a type and nature carried on by  it.
No such resignation will become effective until the Trustee for such Series or a
successor  master  servicer has  assumed the  Master Servicer's  obligations and
duties under the Pooling and Servicing Agreement. If the Master Servicer resigns
for any of  the foregoing  reasons and  the Trustee  is unable  or unwilling  to
assume  responsibility for its duties under the Pooling and Servicing Agreement,
it may appoint another institution to so act as described under "The Pooling and
Servicing Agreement -- Rights Upon Event of Default" below.
 
    The Pooling  and Servicing  Agreement  will also  provide that  neither  the
Master  Servicer  nor any  subcontractor,  nor any  partner,  director, officer,
employee or agent  of any  of them,  will be under  any liability  to the  Trust
Estate or the Certificateholders, for the taking of any action or for refraining
from  the  taking  of any  action  in good  faith  pursuant to  the  Pooling and
Servicing Agreement, or for errors in judgment; provided, however, that  neither
the  Master Servicer, any  subcontractor, nor any such  person will be protected
against any  liability that  would otherwise  be imposed  by reason  of  willful
misfeasance,  bad faith  or gross  negligence in the  performance of  his or its
duties or by reason of reckless disregard  of his or its obligations and  duties
thereunder.  The Pooling and  Servicing Agreement will  further provide that the
Master Servicer, any subcontractor, and any partner, director, officer, employee
or agent of either  of them shall  be entitled to  indemnification by the  Trust
Estate and will be held harmless against any loss, liability or expense incurred
in  connection  with any  legal  action relating  to  the Pooling  and Servicing
Agreement or  the  Certificates,  other  than any  loss,  liability  or  expense
incurred  by reason of willful misfeasance, bad faith or gross negligence in the
performance of his or its duties  thereunder or by reason of reckless  disregard
of  his or its obligations  and duties thereunder. In  addition, the Pooling and
Servicing Agreement will provide that the Master Servicer will not be under  any
obligation  to  appear in,  prosecute or  defend  any legal  action that  is not
incidental to its duties under the  Pooling and Servicing Agreement and that  in
its opinion may involve it in any expense or liability. The Master Servicer may,
however,  in its discretion, undertake any such action deemed by it necessary or
desirable with respect to the Pooling and Servicing 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  Estate and the Master Servicer will be entitled to be reimbursed therefor
out of the Certificate Account,  and any loss to  the Trust Estate arising  from
such  right  of  reimbursement  will  be  allocated  first  to  the Subordinated
Certificate  of  a  Series  before   being  allocated  to  the  related   Senior
Certificates,  or if such Series does not contain Subordinated Certificates, pro
rata among the various Classes of Certificates unless otherwise specified in the
applicable Pooling and Servicing Agreement.
 
    Any person into which the Master Servicer may be merged or consolidated,  or
any  person resulting from any merger,  conversion or consolidation to which the
Master Servicer is a party, or any person succeeding to the business through the
transfer of  substantially all  of its  assets or  all assets  relating to  such
business,  or otherwise,  of the  Master Servicer will  be the  successor of the
Master Servicer  under  the Pooling  and  Servicing Agreement  for  each  Series
provided  that such successor  or resulting entity  has a net  worth of not less
than $15,000,000 and is qualified to service mortgage loans for FNMA or FHLMC.
 
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<PAGE>
    The Master Servicer also has the right to assign its rights and delegate its
duties and  obligations  under the  Pooling  and Servicing  Agreement  for  each
Series;  provided that, if the  Master Servicer desires to  be released from its
obligations under  the Pooling  and Servicing  Agreement, (i)  the purchaser  or
transferee  accepting  such assignment  or  delegation is  qualified  to service
mortgage loans for  FNMA or  FHLMC, (ii) the  purchaser is  satisfactory to  the
Trustee  for  such  Series, in  the  reasonable  exercise of  its  judgment, and
executes and  delivers  to the  Trustee  an  agreement, in  form  and  substance
reasonably  satisfactory to  the Trustee, which  contains an  assumption by such
purchaser or transferee of  the due and punctual  performance and observance  of
each  covenant and condition to be performed  or observed by the Master Servicer
under the  Pooling and  Servicing Agreement  from  and after  the date  of  such
agreement;  and (iii) each applicable Rating Agency's rating of any Certificates
for such Series in effect immediately prior to such assignment, sale or transfer
would not be qualified, downgraded or withdrawn as a result of such  assignment,
sale  or transfer  and the  Certificates would  not be  placed on  credit review
status by any such Rating Agency. The Master Servicer will be released from  its
obligations  under the Pooling and Servicing  Agreement upon any such assignment
and delegation,  except that  the Master  Servicer will  remain liable  for  all
liabilities and obligations incurred by it prior to the time that the conditions
contained in clauses (i), (ii) and (iii) above are met.
 
                      THE POOLING AND SERVICING AGREEMENT
 
ASSIGNMENT OF MORTGAGE LOANS TO THE TRUSTEE
 
    The  Seller will  have acquired  the Mortgage  Loans included  in each Trust
Estate from Norwest  Mortgage pursuant  to an agreement  (the "Norwest  Mortgage
Sale Agreement"). In connection with the conveyance of the Mortgage Loans to the
Seller,  Norwest Mortgage  will (i) agree  to deliver  to the Seller  all of the
documents which the  Seller is  required to deliver  to the  Trustee; (ii)  make
certain  representations and warranties to the Seller which will be the basis of
certain of the Seller's representations and warranties to the Trustee or  assign
the  representations and warranties made by a Correspondent to Norwest Mortgage;
and (iii) agree to  repurchase or substitute (or  assign rights to a  comparable
agreement  of a Correspondent) for  any Mortgage Loan for  which any document is
not delivered or  is found to  be defective  in any material  respect, or  which
Mortgage  Loan  is discovered  at any  time not  to be  in conformance  with any
representation and warranty  Norwest Mortgage  has made  to the  Seller and  the
breach  of such representation and warranty materially and adversely affects the
interests of the  Certificateholders in  the related Mortgage  Loan, if  Norwest
Mortgage  cannot deliver such document  or cure such defect  or breach within 60
days after  notice thereof.  Such agreement  will inure  to the  benefit of  the
Trustee  and is intended to help ensure  the Seller's performance of its limited
obligation to repurchase  or substitute  for Mortgage Loans.  See "The  Mortgage
Loan Programs -- Representations and Warranties" above.
 
    At  the time of issuance of each  Series of Certificates, the Mortgage Loans
in the  related  Trust Estate  will,  pursuant  to the  applicable  Pooling  and
Servicing Agreement, be assigned to the Trustee, together with all principal and
interest received on or with respect to such Mortgage Loans after the applicable
Cut-Off Date other than principal and interest due and payable on or before such
Cut-Off  Date  and interest  attributable to  the Fixed  Retained Yield  on such
Mortgage Loans, if any. See "Servicing  of the Mortgage Loans -- Fixed  Retained
Yield, Servicing Compensation and Payment of Expenses." The Trustee or its agent
will,   concurrently  with   such  assignment,  authenticate   and  deliver  the
Certificates evidencing such Series to the  Seller in exchange for the  Mortgage
Loans.  Each Mortgage  Loan will  be identified  in a  schedule appearing  as an
exhibit to the applicable  Pooling and Servicing  Agreement. Each such  schedule
will  include, among other things, the unpaid  principal balance as of the close
of business on the applicable Cut-Off  Date, the maturity date and the  Mortgage
Interest Rate for each Mortgage Loan in the related Trust Estate.
 
    In  addition, with  respect to  each Mortgage  Loan in  a Trust  Estate, the
mortgage or other promissory note, any assumption, modification or conversion to
fixed interest rate agreement, a mortgage assignment in recordable form and  the
recorded  Mortgage (or other  documents as are required  under applicable law to
create  perfected  security  interest  in   the  Mortgaged  Property  in   favor
 
                                       53
<PAGE>
of  the  Trustee) will  be  delivered to  the Trustee  or,  if indicated  in the
applicable Prospectus Supplement,  to a custodian;  provided that, in  instances
where  recorded documents cannot  be delivered due to  delays in connection with
recording, copies  thereof, certified  by the  Seller to  be true  and  complete
copies  of such documents sent for recording,  may be delivered and the original
recorded documents will be  delivered promptly upon  receipt. The assignment  of
each   Mortgage  will  be  recorded  promptly  after  the  initial  issuance  of
Certificates for  the related  Trust  Estate, except  in  states where,  in  the
opinion  of counsel acceptable to the Trustee, such recording is not required to
protect the Trustee's  interest in the  Mortgage Loan against  the claim of  any
subsequent  transferee or  any successor to  or creditor of  the Seller, Norwest
Mortgage or the originator of such Mortgage Loan.
 
    The Trustee or custodian will hold  such documents in trust for the  benefit
of  Certificateholders  of the  related Series  and  will review  such documents
within 180 days of the date  of the applicable Pooling and Servicing  Agreement.
If  any document is  not delivered or is  found to be  defective in any material
respect, or  if the  Seller  is in  breach of  any  of its  representations  and
warranties,  and such breach  materially and adversely  affects the interests of
the Certificateholders in a  Mortgage Loan, and the  Seller cannot deliver  such
document  or cure  such defect  or breach  within 60  days after  written notice
thereof, the Seller will, within 60  days of such notice, either repurchase  the
related  Mortgage Loan  from the  Trustee at  a price  equal to  the then unpaid
principal balance thereof, plus  accrued and unpaid  interest at the  applicable
Mortgage  Interest Rate (minus any Fixed Retained Yield) through the last day of
the month in which such repurchase takes place, or (in the case of a Series  for
which  one or more REMIC elections have been or will be made, unless the maximum
period as  may  be  provided  by  the Code  or  applicable  regulations  of  the
Department of the Treasury ("Treasury Regulations") shall have elapsed since the
execution of the applicable Pooling and Servicing Agreement) substitute for such
Mortgage  Loan  a  new  mortgage  loan  having  characteristics  such  that  the
representations and warranties  of the  Seller made pursuant  to the  applicable
Pooling and Servicing Agreement (except for representations and warranties as to
the  correctness of  the applicable schedule  of mortgage loans)  would not have
been incorrect  had such  substitute Mortgage  Loan originally  been a  Mortgage
Loan.  In the case  of a repurchased  Mortgage Loan, the  purchase price will be
deposited by the Seller  in the related  Certificate Account. In  the case of  a
substitute  Mortgage Loan, the mortgage file  relating thereto will be delivered
to the Trustee or the custodian and  the Seller will deposit in the  Certificate
Account,  an amount equal to  the excess of (i)  the unpaid principal balance of
the Mortgage  Loan which  is substituted  for, over  (ii) the  unpaid  principal
balance  of the substitute Mortgage Loan,  together with interest on such excess
at the  Mortgage Interest  Rate (minus  any Fixed  Retained Yield)  to the  next
scheduled  Due Date of the  Mortgage Loan which is  being substituted for. In no
event will any substitute Mortgage Loan have an unpaid principal balance greater
than  the  scheduled  principal  balance  calculated  in  accordance  with   the
amortization  schedule (the "Scheduled Principal  Balance") of the Mortgage Loan
for which it  is substituted  (after giving  effect to  the scheduled  principal
payment  due in the month of substitution on the Mortgage Loan substituted for),
or a term greater than, a Mortgage Interest Rate less than, a Mortgage  Interest
Rate  more than  one percent  per annum  greater than  or a  Loan-to-Value Ratio
greater than, the Mortgage Loan for which it is substituted. If substitution  is
to  be made for an  adjustable rate Mortgage Loan,  the substitute Mortgage Loan
will have an unpaid  principal balance no greater  than the Scheduled  Principal
Balance of the Mortgage Loan for which it is substituted (after giving effect to
the scheduled principal payment due in the month of substitution on the Mortgage
Loan  substituted  for), a  Loan-to-Value Ratio  less  than or  equal to,  and a
Mortgage Interest Rate at least equal to, that of the Mortgage Loan for which it
is substituted,  and will  bear interest  based on  the same  index, margin  and
frequency  of  adjustment  as  the  substituted  Mortgage  Loan.  The repurchase
obligation and the mortgage substitution  referred to above will constitute  the
sole remedies available to the Certificateholders or the Trustee with respect to
missing  or defective  documents or breach  of the  Seller's representations and
warranties.
 
    If no custodian is named in the Pooling and Servicing Agreement, the Trustee
will be  authorized  to  appoint  a custodian  to  maintain  possession  of  the
documents  relating to  the Mortgage  Loans and  to conduct  the review  of such
documents described above. Any custodian so appointed will keep and review  such
documents as the Trustee's agent under a custodial agreement.
 
                                       54
<PAGE>
OPTIONAL PURCHASES
 
    Subject to the provisions of the applicable Pooling and Servicing Agreement,
the  Seller or the Master  Servicer may, at such  party's option, repurchase any
Mortgage Loan  which  is  in  default  or as  to  which  default  is  reasonably
foreseeable  if, in the Seller's or  the Master Servicer's judgment, the related
default is not likely to be cured by the borrower or default is not likely to be
averted, at a price equal to  the unpaid principal balance thereof plus  accrued
interest thereon and under the conditions set forth in the applicable Prospectus
Supplement.
 
REPORTS TO CERTIFICATEHOLDERS
 
    Unless  otherwise specified or modified in the related Pooling and Servicing
Agreement for each Series, the Master Servicer will prepare and the Trustee will
include with each distribution to Certificateholders of record of such Series  a
statement setting forth the following information, if applicable:
 
           (i)
           the amount of such distribution allocable to principal of the related
           Mortgage  Loans, separately  identifying the aggregate  amount of any
    principal prepayments  included therein,  the  amount of  such  distribution
    allocable to interest on the related Mortgage Loans and the aggregate unpaid
    principal balance of the Mortgage Loans evidenced by each Class after giving
    effect to the principal distributions on such Distribution Date;
 
          (ii)
           the  amount  of servicing  compensation with  respect to  the related
           Trust Estate and such other  customary information as is required  to
    enable Certificateholders to prepare their tax returns;
 
         (iii)
           the  amount by which  the Servicing Fee  for the related Distribution
           Date has been reduced by interest shortfalls due to prepayments;
 
          (iv)
           the aggregate amount of  any Periodic Advances  by the Servicer,  the
           Master  Servicer  or the  Trustee  included in  the  amounts actually
    distributed to the Certificateholders;
 
           (v)
           to each holder of a Certificate entitled to the benefits of  payments
           under any form of credit enhancement or from any Reserve Fund:
 
              (a)
               the  amounts  so  distributed  under  any  such  form  of  credit
               enhancement or  from  any such  Reserve  Fund on  the  applicable
       Distribution Date; and
 
              (b)
               the  amount of coverage  remaining under any  such form of credit
               enhancement and  the  balance in  any  such Reserve  Fund,  after
       giving  effect  to  any  payments thereunder  and  other  amounts charged
       thereto on the Distribution Date;
 
          (vi)
           in the case of a Series of Certificates with a variable  Pass-Through
           Rate, such Pass-Through Rate;
 
         (vii)
           the book value of any collateral acquired by the Trust Estate through
           foreclosure or otherwise;
 
        (viii)
           the  unpaid principal  balance of any  Mortgage Loan as  to which the
           Servicer has  notified the  Master Servicer  that such  Servicer  has
    determined  not  to  foreclose  because it  believes  the  related Mortgaged
    Property may  be  contaminated  with  or affected  by  hazardous  wastes  or
    hazardous substances; and
 
          (ix)
           the  number  and aggregate  principal  amount of  Mortgage  Loans one
           month, two months and three or more months delinquent.
 
    In addition,  within a  reasonable period  of  time after  the end  of  each
calendar  year, the Master Servicer will furnish either directly, or through the
Trustee, a report to  each Certificateholder of record  at any time during  such
calendar   year  such  information  as  required  by  the  Code  and  applicable
regulations  thereunder  to  enable  Certificateholders  to  prepare  their  tax
returns.  In the event that an election has  been made to treat the Trust Estate
(or   one    or    more    segregated    pools    of    assets    therein)    as
 
                                       55
<PAGE>
a  REMIC, the Trustee will be required  to sign the federal and applicable state
and local income tax returns of the REMIC (which will be prepared by the  Master
Servicer).  See  "Certain  Federal  Income  Tax  Consequences  -- Administrative
Matters."
 
LIST OF CERTIFICATEHOLDERS
 
    The Pooling and Servicing Agreement for each Series will require the Trustee
to  provide  access  to  the  most  current  list  of  names  and  addresses  of
Certificateholders   of   such   Series   to  any   group   of   five   or  more
Certificateholders who  advise  the  Trustee  in writing  that  they  desire  to
communicate with other Certificateholders with respect to their rights under the
Pooling and Servicing Agreement or under the Certificates.
 
EVENTS OF DEFAULT
 
    Events  of Default under the Pooling and Servicing Agreement for each Series
include (i) any failure by the Master Servicer to make a required deposit  which
continues  unremedied for three business days after the giving of written notice
of such failure to the Master Servicer by the Trustee for such Series, or to the
Master Servicer and the  Trustee by the holders  of Certificates of such  Series
having  voting  rights  allocated  to  such  Certificates  ("Voting  Interests")
aggregating not  less  than  25%  of  the  Voting  Interests  allocated  to  all
Certificates  for such Series; (ii)  any failure by the  Master Servicer duly to
observe or  perform  in any  material  respect any  other  of its  covenants  or
agreements in the Pooling and Servicing Agreement which continues unremedied for
60  days (or 30  days in the  case of a  failure to maintain  any pool insurance
policy  required  to  be  maintained  pursuant  to  the  Pooling  and  Servicing
Agreement)  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 aggregating not less  than 25% of the Voting Interests;
(iii) certain events of insolvency,  readjustment of debt, marshaling of  assets
and liabilities or similar proceedings and certain action by the Master Servicer
indicating  its insolvency, reorganization  or inability to  pay its obligations
and (iv) it and any subservicer  appointed by it becoming ineligible to  service
for both FNMA and FHLMC (unless remedied within 90 days). (Section 7.01).
 
RIGHTS UPON EVENT OF DEFAULT
 
    So  long as  an Event  of Default remains  unremedied under  the Pooling and
Servicing Agreement for  a Series,  the Trustee for  such Series  or holders  of
Certificates  of such  Series evidencing  not less  than 66  2/3% of  the Voting
Interests in the Trust Estate  for such Series may  terminate all of the  rights
and obligations of the Master Servicer under the Pooling and Servicing Agreement
and  in and  to the Mortgage  Loans (other  than the Master  Servicer's right to
recovery of  the  aggregate Master  Servicing  Fees due  prior  to the  date  of
termination,  and other expenses  and amounts advanced pursuant  to the terms of
the Pooling  and Servicing  Agreement,  which rights  the Master  Servicer  will
retain  under all circumstances), whereupon the  Trustee will succeed to all the
responsibilities, duties  and  liabilities  of the  Master  Servicer  under  the
Pooling and Servicing Agreement and will be entitled to monthly compensation not
to   exceed  the  aggregate  Master  Servicing  Fees  together  with  the  other
compensation to which  the Master  Servicer is  entitled under  the Pooling  and
Servicing  Agreement. In the event that the Trustee is unwilling or unable so to
act, it  may select,  pursuant to  the  public bid  procedure described  in  the
applicable  Pooling and  Servicing Agreement, or  petition a  court of competent
jurisdiction to  appoint,  a  housing  and home  finance  institution,  bank  or
mortgage  servicing institution with a net worth  of at least $10,000,000 to act
as successor to  the Master  Servicer under the  provisions of  the Pooling  and
Servicing  Agreement;  provided  however,  that until  such  a  successor Master
Servicer  is  appointed  and  has  assumed  the  responsibilities,  duties   and
liabilities  of the Master  Servicer under the  Pooling and Servicing Agreement,
the Trustee shall continue as the successor to the Master Servicer as  described
above.  In the event such public bid  procedure is utilized, the successor would
be entitled to compensation in an amount equal to the aggregate Master Servicing
Fees, together  with the  other compensation  to which  the Master  Servicer  is
entitled  under the  Pooling and  Servicing Agreement,  and the  Master Servicer
would be entitled to receive the net profits, if any, realized from the sale  of
its  rights and obligations under the Pooling and Servicing Agreement. (Sections
7.01 and 7.05).
 
                                       56
<PAGE>
    During  the  continuance  of any  Event  of  Default under  the  Pooling and
Servicing Agreement for  a Series,  the Trustee for  such Series  will have  the
right  to take  action to  enforce its  rights and  remedies and  to protect and
enforce the rights and  remedies of the Certificateholders  of such Series,  and
holders of Certificates evidencing not less than 25% of the Voting Interests for
such Series may direct the time,
method  and place of conducting  any proceeding for any  remedy available to the
Trustee or exercising any  trust or power conferred  upon the Trustee.  However,
the  Trustee will not  be under any obligation  to pursue any  such remedy or to
exercise any  of  such trusts  or  powers unless  such  Certificateholders  have
offered  the Trustee reasonable security or indemnity against the cost, expenses
and liabilities which may be incurred by the Trustee thereby. Also, the  Trustee
may  decline to  follow any  such direction if  the Trustee  determines that the
action or proceeding so directed may not  lawfully be taken or would involve  it
in   personal  liability  or  be   unjustly  prejudicial  to  the  non-assenting
Certificateholders. (Sections 7.02 and 7.03).
 
    No Certificateholder of a Series, solely  by virtue of such holder's  status
as  a Certificateholder,  will have  any right  under the  Pooling and Servicing
Agreement for  such Series  to  institute any  proceeding  with respect  to  the
Pooling  and Servicing Agreement, unless such holder previously has given to the
Trustee for such  Series written  notice of default  and unless  the holders  of
Certificates  evidencing  not less  than 25%  of the  Voting Interests  for such
Series 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. (Section 10.03).
 
AMENDMENT
 
    Each Pooling  and Servicing  Agreement may  be amended  by the  Seller,  the
Master  Servicer and the Trustee without  the consent of the Certificateholders,
(i) to  cure  any  ambiguity or  mistake,  (ii)  to correct  or  supplement  any
provision  therein that  may be inconsistent  with any  other provision therein,
(iii) to modify, eliminate  or add to  any of its provisions  to such extent  as
shall  be necessary to maintain the qualification of the Trust Estate (or one or
more segregated  pools of  assets therein)  as a  REMIC at  all times  that  any
Certificates  are outstanding or to avoid or minimize the risk of the imposition
of any tax  on the  Trust Estate  pursuant to  the Code  that would  be a  claim
against  the Trust Estate, provided that the  Trustee has received an opinion of
counsel to the  effect that such  action is necessary  or desirable to  maintain
such  qualification or to  avoid or minimize  the risk of  the imposition of any
such tax and  such action will  not, as  evidenced by such  opinion of  counsel,
adversely affect in any material respect the interests of any Certificateholder,
(iv)  to  change  the timing  and/or  nature  of deposits  into  the Certificate
Account, provided  that such  change will  not, as  evidenced by  an opinion  of
counsel,  adversely  affect  in  any  material  respect  the  interests  of  any
Certificateholder and  that  such change  will  not adversely  affect  the  then
current  rating assigned to any Certificates, as evidenced by a letter from each
Rating Agency to such effect, (v) to add to, modify or eliminate any  provisions
therein  restricting transfers of residual  Certificates to certain disqualified
organizations described below under "Certain Federal Income Tax Consequences  --
Federal  Income Tax Consequences for REMIC  Certificates -- Taxation of Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual  Certificates,"
(vi)  to make certain provisions  with respect to the  denominations of, and the
manner of payments on, certain  Classes or Subclasses of Certificates  initially
retained  by the Seller or  an affiliate, or (vii)  to make any other provisions
with respect to matters  or questions arising under  such Pooling and  Servicing
Agreement  that are not inconsistent with  the provisions thereof, provided that
such action will not, as evidenced by an opinion of counsel, adversely affect in
any material  respect the  interests of  the Certificateholders  of the  related
Series.  The Pooling and Servicing Agreement may  also be amended by the Seller,
the Master  Servicer  and  the  Trustee  with the  consent  of  the  holders  of
Certificates  evidencing  interests aggregating  not less  than  66 2/3%  of the
Voting Interests  evidenced  by  the  Certificates of  each  Class  or  Subclass
affected thereby, for the purpose of adding any provisions to or changing in any
manner  or  eliminating any  of  the provisions  of  such Pooling  and Servicing
Agreement or of modifying  in any manner the  rights of the  Certificateholders;
provided,  however, that  no such  amendment may  (i) reduce  in any  manner the
amount of, or delay the timing of, any payments
 
                                       57
<PAGE>
received on  or  with  respect  to  Mortgage  Loans  that  are  required  to  be
distributed  on  any Certificates,  without the  consent of  the holder  of such
Certificate, (ii) adversely affect in any material respect the interests of  the
holders  of a Class  or Subclass of Certificates  of a Series  in a manner other
than that  set  forth  in (i)  above  without  the consent  of  the  holders  of
Certificates aggregating not less than 66 2/3% of the Voting Interests evidenced
by  such  Class  or  Subclass,  or  (iii)  reduce  the  aforesaid  percentage of
Certificates of any  Class or  Subclass, the holders  of which  are required  to
consent   to  such  amendment,  without  the  consent  of  the  holders  of  all
Certificates  of   such   Class   or   Subclass   affected   then   outstanding.
Notwithstanding  the  foregoing,  the  Trustee  will  not  consent  to  any such
amendment if such amendment  would subject the Trust  Estate (or any  segregated
pool of assets therein) to tax or cause the Trust Estate (or any segregated pool
of assets therein) to fail to qualify as a REMIC.
 
TERMINATION; OPTIONAL PURCHASE OF MORTGAGE LOANS
 
    The  obligations created by the Pooling and Servicing Agreement for a Series
of Certificates  will terminate  on the  Distribution Date  following the  final
payment  or other liquidation of the last  Mortgage Loan subject thereto and the
disposition of all property acquired upon foreclosure of any such Mortgage Loan.
In no  event, however,  will the  trust  created by  the Pooling  and  Servicing
Agreement  continue beyond the expiration of 21 years from the death of the last
survivor of certain persons named in  such Pooling and Servicing Agreement.  For
each Series of Certificates, the Trustee will give written notice of termination
of  the Pooling and Servicing Agreement to each Certificateholder, and the final
distribution  will  be  made  only  upon  surrender  and  cancellation  of   the
Certificates at an office or agency appointed by the Seller and specified in the
notice of termination.
 
    If  so provided  in the  applicable Prospectus  Supplement, the  Pooling and
Servicing Agreement  for  each  Series  of Certificates  will  permit,  but  not
require, the Seller, Norwest Mortgage or such other party as is specified in the
applicable  Prospectus Supplement,  to purchase from  the Trust  Estate for such
Series all  remaining Mortgage  Loans at  the time  subject to  the Pooling  and
Servicing  Agreement at a price specified  in such Prospectus Supplement. In the
event that such  party has caused  the related Trust  Estate (or any  segregated
pool  of assets  therein) to be  treated as a  REMIC, any such  purchase will be
effected only pursuant to a "qualified  liquidation" as defined in Code  Section
860F(a)(4)(A)  and the receipt by the Trustee  of an opinion of counsel or other
evidence that such purchase will  not (i) result in the  imposition of a tax  on
"prohibited  transactions" under Code Section 860F(a)(1), (ii) otherwise subject
the Trust Estate to tax, or (iii) cause the Trust Estate (or any segregated pool
of assets) to fail to qualify as a REMIC. The exercise of such right will effect
early retirement  of  the Certificates  of  that Series,  but  the right  so  to
purchase  may be  exercised only  after the  aggregate principal  balance of the
Mortgage Loans for such Series at the time of purchase is less than a  specified
percentage  of  the aggregate  principal  balance at  the  Cut-Off Date  for the
Series, or after the date set forth in the applicable Prospectus Supplement.
 
THE TRUSTEE
 
    The Trustee under each Pooling and Servicing Agreement (the "Trustee")  will
be  named in the applicable Prospectus  Supplement. The commercial bank or trust
company serving as Trustee may have normal banking relationships with the Seller
or any of its affiliates.
 
    The Trustee may resign at any time, in which event the Master Servicer  will
be obligated to appoint a successor trustee. The Master Servicer may also remove
the  Trustee if the  Trustee ceases to be  eligible to act  as Trustee under the
Pooling and Servicing Agreement, if the Trustee becomes insolvent or in order to
change the situs of the Trust Estate for state tax reasons. Upon becoming  aware
of  such circumstances, the  Master Servicer will become  obligated to appoint a
successor trustee. The Trustee may also be removed at any time by the holders of
Certificates evidencing not less than 51%  of the Voting Interests in the  Trust
Estate,  except that, any Certificate registered in  the name of the Seller, the
Master Servicer  or any  affiliate thereof  will not  be taken  into account  in
determining  whether the requisite Voting Interest in the Trust Estate necessary
to effect any such removal has been obtained. Any resignation and removal of the
Trustee, and the appointment of a  successor trustee, will not become  effective
until   acceptance   of  such   appointment  by   the  successor   trustee.  The
 
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Trustee, and any successor trustee, will have a combined capital and surplus  of
at  least  $50,000,000,  or will  be  a member  of  a bank  holding  system, the
aggregate combined  capital  and  surplus  of which  is  at  least  $50,000,000,
provided  that the Trustee's  and any such  successor trustee's separate capital
and surplus shall  at all  times be  at least  the amount  specified in  Section
310(a)(2) of the Trust Indenture Act of 1939, and will be subject to supervision
or examination by federal or state authorities.
 
                  CERTAIN LEGAL ASPECTS OF THE MORTGAGE LOANS
 
    The  following  discussion contains  summaries of  certain legal  aspects of
mortgage loans  which are  general in  nature. Because  such legal  aspects  are
governed  by applicable  state law  (which laws  may differ  substantially), the
summaries do not purport to be complete or to reflect the laws of any particular
state, nor to encompass  the laws of  all states in which  the security for  the
Mortgage  Loans is  situated. The summaries  are qualified in  their entirety by
reference to the applicable federal and state laws governing the Mortgage Loans.
 
GENERAL
 
    The Mortgage Loans will, in general, be secured by either first mortgages or
first deeds of  trust, depending upon  the prevailing practice  in the state  in
which  the underlying property  is located. A  mortgage creates a  lien upon the
real property described in  the mortgage. There are  two parties to a  mortgage:
the  mortgagor, who is the borrower (or, in  the case of a Mortgage Loan secured
by a property  that has been  conveyed to  an INTER VIVOS  revocable trust,  the
settlor  of such  trust); and the  mortgagee, who  is the lender.  In a mortgage
instrument state,  the  mortgagor delivers  to  the  mortgagee a  note  or  bond
evidencing  the loan and the mortgage. Although a  deed of trust is similar to a
mortgage, a  deed of  trust has  three parties:  a borrower  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 borrower 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 loan.
The trustee's authority  under a  deed of  trust and  the mortgagee's  authority
under  a mortgage are governed by the express provisions of the deed of trust or
mortgage, applicable law, and, in some cases, with respect to the deed of trust,
the directions of the beneficiary.
 
FORECLOSURE
 
    Foreclosure of  a mortgage  is generally  accomplished by  judicial  action.
Generally,  the action is initiated  by the service of  legal pleadings upon all
parties having an interest of record in the real property. Delays in  completion
of  the  foreclosure  occasionally  may  result  from  difficulties  in locating
necessary parties  defendant.  When  the mortgagee's  right  of  foreclosure  is
contested,  the  legal  proceedings  necessary  to  resolve  the  issue  can  be
time-consuming. After the completion of  a judicial foreclosure proceeding,  the
court  may  issue a  judgment of  foreclosure  and appoint  a receiver  or other
officer to conduct the sale of the property. In some states, mortgages may  also
be  foreclosed by  advertisement, pursuant  to a power  of sale  provided in the
mortgage. Foreclosure of a mortgage  by advertisement is essentially similar  to
foreclosure of a deed of trust by non-judicial power of sale.
 
    Foreclosure  of a deed of trust  is generally accomplished by a non-judicial
trustee's sale under a specific provision  in the deed of trust that  authorizes
the  trustee to  sell the  property to  a third  party upon  any default  by the
borrower under the terms of the note  or deed of trust. In certain states,  such
foreclosure  also may be accomplished by  judicial action in the manner provided
for foreclosure of mortgages. In some  states, the trustee must record a  notice
of  default and send  a copy to the  borrower-trustor and to  any person who has
recorded a request  for a copy  of a notice  of default and  notice of sale.  In
addition, the trustee must provide notice in some states to any other individual
having  an  interest  of  record  in the  real  property,  including  any junior
lienholders. If the deed of trust  is not reinstated within any applicable  cure
period,  a notice of sale must be posted  in a public place and, in most states,
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 of record in the property.
 
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<PAGE>
    In  some states, the borrower-trustor has the right to reinstate the loan at
any time following default until shortly before the trustee's sale. In  general,
the  borrower,  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. Certain state laws  control the amount  of foreclosure expenses  and
costs, including attorneys' fees, which may be recovered by a lender.
 
    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  the difficulty a  potential buyer at  the sale would
have in determining the exact status of title and because 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
receiver for an amount equal to the unpaid principal amount of the note, accrued
and unpaid interest and the expenses of foreclosure. Thereafter, subject to  the
right  of  the  borrower in  some  states  to remain  in  possession  during the
redemption period, the lender  will assume the  burdens of ownership,  including
obtaining  hazard insurance and  making such repairs  at its own  expense as are
necessary to render  the property suitable  for sale. The  lender commonly  will
obtain  the services of a real estate broker  and pay the broker a 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. Any loss may  be reduced by the receipt of  mortgage
insurance  proceeds, if any, or by judicial  action against the borrower for the
deficiency, if  such  action  is  permitted  by  law.  See  "--  Anti-Deficiency
Legislation and Other Limitations on Lenders" below.
 
FORECLOSURE ON SHARES OF COOPERATIVES
 
    The  cooperative shares owned  by the tenant-stockholder  and pledged to the
lender 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, and may  be cancelled by  the
cooperative  for  failure  by  the  tenant-stockholder  to  pay  rent  or  other
obligations or  charges owed  by such  tenant-stockholder, including  mechanics'
liens   against   the   cooperative   apartment   building   incurred   by  such
tenant-stockholder. The  proprietary  lease  or  occupancy  agreement  generally
permits  the cooperative to  terminate such lease  or agreement in  the event an
obligor fails  to make  payments or  defaults in  the performance  of  covenants
required  thereunder. Typically,  the lender  and the  cooperative enter  into a
recognition agreement  which  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 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  cooperative  apartment, subject,
however, to the cooperative's right to sums due under such 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 value of the collateral below the outstanding principal balance
of the cooperative loan and accrued and unpaid interest thereon.
 
    Recognition  agreements also provide that in the event of a foreclosure on a
cooperative loan,  the  lender  must  obtain the  approval  or  consent  of  the
cooperative  as  required  by  the  proprietary  lease  before  transferring the
cooperative shares or assigning the proprietary lease. Generally, the lender  is
not  limited  by the  agreement  in any  rights it  may  have to  dispossess the
tenant-stockholders.
 
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<PAGE>
    Foreclosure  on  the  cooperative  shares  is  accomplished  by  a  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 foreclosure 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 foreclosure. Generally, a sale conducted according to the
usual practice of banks 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 and/or foreclosure of
a mortgage,  the borrower  and certain  foreclosed junior  lienors are  given  a
statutory  period in which to redeem the  property from the foreclosure sale. In
most states where the right of redemption is available, statutory redemption may
occur upon  payment of  the  foreclosure purchase  price, accrued  interest  and
taxes.  In some states, the right to redeem is an equitable right. The effect of
a right  of redemption  is  to delay  the  ability of  the  lender to  sell  the
foreclosed  property. The  exercise of  a right  of redemption  would defeat the
title of any  purchaser at  a foreclosure  sale, or  of any  purchaser from  the
lender  subsequent  to  judicial foreclosure  or  sale  under a  deed  of trust.
Consequently, the  practical effect  of the  redemption right  is to  force  the
lender  to maintain  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  restrictions that limit the  remedies
of  a beneficiary under a deed of trust or a mortgagee under a mortgage. In some
states, statutes limit  the right of  the beneficiary or  mortgagee to obtain  a
deficiency  judgment against the borrower following  foreclosure or sale under a
deed of trust. A deficiency judgment  is a personal judgment against the  former
borrower  equal in most  cases to the  difference between the  amount due to the
lender and the net amount realized upon the foreclosure sale.
 
    Some state statutes may require the beneficiary or mortgagee 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 borrower.
In certain other states, the lender has the option of bringing a personal action
against  the  borrower  on  the debt  without  first  exhausting  such security;
however, in  some  of these  states,  the  lender, following  judgment  on  such
personal  action, may be  deemed to have  elected a remedy  and may be precluded
from exercising  remedies  with  respect  to  the  security.  Consequently,  the
practical  effect of the election requirement,  when applicable, is that lenders
will usually proceed first against the security rather than bringing a  personal
action against the borrower.
 
    Other  statutory provisions  may limit  any deficiency  judgment against the
former borrower following a  foreclosure sale to the  excess of the  outstanding
debt  over the fair market value  of the property at the  time of such sale. The
purpose of  these statutes  is to  prevent  a beneficiary  or a  mortgagee  from
obtaining a large deficiency judgment against the former borrower as a result of
low or no bids at the foreclosure sale.
 
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<PAGE>
    In  some states, exceptions to the anti-deficiency statutes are provided for
in certain instances where the value of the lender's security has been  impaired
by  acts or omissions of the borrower, for example, in the event of waste of the
property.
 
    Generally, Article 9 of  the UCC governs  foreclosure on cooperative  shares
and  the related proprietary lease or occupancy agreement and foreclosure on the
beneficial interest in a land trust. Some courts have interpreted Section  9-504
of  the UCC to prohibit a deficiency  award unless the creditor establishes that
the sale of the  collateral (which, in  the case of a  Mortgage Loan secured  by
shares  of a cooperative, would be such shares and the related proprietary lease
or occupancy agreement) was conducted in a commercially reasonable manner.
 
    A Servicer generally will  not be required  under the applicable  Underlying
Servicing Agreement to pursue deficiency judgments on the Mortgage Loans even if
permitted by law.
 
    In  addition  to  anti-deficiency and  related  legislation,  numerous other
federal and state  statutory provisions, including  the federal bankruptcy  laws
and  state laws affording  relief to debtors,  may interfere with  or affect the
ability of a secured mortgage lender to realize upon its security. For  example,
numerous statutory provisions under the United States Bankruptcy Code, 11 U.S.C.
Sections  101 ET SEQ., (the "Bankruptcy Code")  may interfere with or affect the
ability of the  Seller to obtain  payment of  a Mortgage Loan,  to realize  upon
collateral  and/or  enforce a  deficiency judgment.  For example,  under federal
bankruptcy  law,  virtually  all  actions  (including  foreclosure  actions  and
deficiency  judgment proceedings) are automatically stayed  upon the filing of a
bankruptcy petition, and often no interest or principal payments are made during
the course of the  bankruptcy proceeding. In a  case under the Bankruptcy  Code,
the  secured party is precluded from  foreclosing without authorization from the
bankruptcy court. In addition, a court with federal bankruptcy jurisdiction  may
permit  a debtor  through his or  her Chapter  11 or Chapter  13 plan  to cure a
monetary default in  respect of a  Mortgage Loan 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 final judgment
of foreclosure had been entered in state court (provided no foreclosure sale had
yet 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 case, that effected the curing of a mortgage loan default by paying
arrearages over a number of years.
 
    If a  Mortgage Loan  is secured  by property  NOT consisting  solely of  the
debtor's  principal residence,  the Bankruptcy  Code also  permits such Mortgage
Loan to be modified. 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 property, thus
leaving the  lender in  the position  of a  general unsecured  creditor for  the
difference  between the value of the property and the outstanding balance of the
Mortgage Loan. Some courts have  permitted such modifications when the  Mortgage
Loan  is  secured  both by  the  debtor's  principal residence  and  by personal
property.
 
    If a court relieves a borrower's  obligation to repay amounts otherwise  due
on  a Mortgage Loan, the Servicer will  not be required to advance such amounts,
and any loss in respect thereof will be borne by the Certificateholders.
 
    The Internal Revenue Code of 1986, as amended, provides priority to  certain
tax  liens over  the lien of  the mortgage  or deed of  trust. The  laws of some
states provide priority to certain  tax liens over the  lien of the mortgage  or
deed  of trust. Numerous federal and  some state consumer protection laws impose
substantive  requirements  upon   mortgage  lenders  in   connection  with   the
origination, servicing and enforcement 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  and regulations.  These federal  laws  and state  laws impose
specific statutory liabilities  upon lenders who  originate or service  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.
 
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<PAGE>
SOLDIERS' AND SAILORS' CIVIL RELIEF ACT AND SIMILAR LAWS
 
    Generally, under the terms of the Soldiers' and Sailors' Civil Relief Act of
1940,  as amended  (the "Relief  Act"), a  borrower who  enters military service
after the origination of such borrower's Mortgage Loan (including a borrower 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 borrower's
active duty status,  unless a  court orders  otherwise upon  application of  the
lender.  It  is  possible  that  such  action  could  have  an  effect,  for  an
indeterminate period of  time, on the  ability of the  Servicer to collect  full
amounts  of interest  on certain of  the Mortgage  Loans in a  Trust Estate. Any
shortfall in interest collections resulting  from the application of the  Relief
Act  could result in  losses to the  holders of the  Certificates of the related
Series. Further,  the Relief  Act  imposes limitations  which would  impair  the
ability  of the Servicer  to foreclose on  an affected Mortgage  Loan during the
borrower'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. Certain
states have enacted comparable  legislation which may  interfere with or  affect
the ability of the Servicer to timely collect payments of principal and interest
on,  or to  foreclose on,  Mortgage Loans  of borrowers  in such  states who are
active or reserve members of the armed services.
 
ENVIRONMENTAL CONSIDERATIONS
 
    Under the  federal  Comprehensive Environmental  Response  Compensation  and
Liability  Act, as amended ("CERCLA"), and under  state law in certain states, a
secured party which takes a deed  in lieu of foreclosure, purchases a  mortgaged
property  at  a foreclosure  sale or  operates a  mortgaged property  may become
liable in  certain circumstances  for  the costs  of remedial  action  ("Cleanup
Costs")  if  hazardous  wastes or  hazardous  substances have  been  released or
disposed of on the  property. Such Cleanup Costs  may be substantial. Under  the
laws  of certain states, failure to perform the remediation required or demanded
by the state of any condition or  circumstance that (i) may pose an imminent  or
substantial  endangerment to  the public health  or welfare  or the environment,
(ii) may result in a release or threatened release of any hazardous  substances,
or  (iii) may give rise to any environmental  claim or demand may give rise to a
lien  on  the  property  to  ensure  the  reimbursement  of  Cleanup  Costs   (a
"Superlien").  All subsequent  liens on such  property are  subordinated to such
Superlien and, in  some states, even  prior recorded liens  are subordinated  to
such Superliens. In the latter states, the security interest of the Trustee in a
property that is subject to such a Superlien could be adversely affected.
 
    The  state of  the law  is currently  unclear as  to whether  and under what
circumstances Cleanup Costs, or the  obligation to take remedial actions,  could
be  imposed on a secured lender such as the Trust Estate. Under the laws of some
states and under CERCLA, a  lender may be liable as  an "owner or operator"  for
costs of addressing releases or threatened releases of hazardous substances on a
mortgaged  property if such lender or  its agents or employees have participated
in  the  management  of  the  operations  of  the  borrower,  even  though   the
environmental  damage or threat was caused by  a prior owner or current owner or
operator or other third  party. Excluded from CERCLA's  definition of "owner  or
operator,"  however, is a person "who without participating in the management of
the facility,  holds indicia  of  ownership primarily  to protect  his  security
interest"  (the "secured-creditor exemption").  This exemption for  holders of a
security interest such as a secured lender applies only when the lender seeks to
protect its security interest in the contaminated facility or property. Thus, if
a lender's  activities  begin to  encroach  on  the actual  management  of  such
facility  or  property, the  lender faces  potential liability  as an  "owner or
operator" under CERCLA. Similarly, when a lender forecloses and takes title to a
contaminated facility  or  property,  the  lender  may  incur  potential  CERCLA
liability  in various circumstances,  including among others,  when it holds the
facility or  property  as  an  investment (including  leasing  the  facility  or
property  to a third party), fails to market the property in a timely fashion or
fails to properly address environmental conditions at the property or facility.
 
                                       63
<PAGE>
    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
CERCLA's  secured-creditor exemption. The court's opinion suggests 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 under CERCLA;
rather,  liability  could  attach  to  a  lender  if  its  involvement  with the
management of the  facility is broad  enough to support  the inference that  the
lender  had  the capacity  to influence  the  borrower's treatment  of hazardous
waste. 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., apparently disagreeing with, but not
expressly contradicting, the FLEET FACTORS court, held that a secured lender had
no liability absent "some actual management of the facility" on the part of  the
lender.  On April  29, 1992, the  United States  Environmental Protection Agency
(the  "EPA")  issued  a  final   rule  interpreting  and  delineating   CERCLA's
secured-creditor  exemption and  the range  of permissible  actions that  may be
undertaken by a holder of a  contaminated facility without exceeding the  bounds
of  the secured-creditor exemption. On February 4, 1994, the United States Court
of Appeals for the District of Columbia Circuit in KELLEY V. EPA invalidated the
EPA rule. As a result of the KELLEY  case, the state of the law with respect  to
the  secured creditor  exemption remains unclear.  In addition, even  if the EPA
rule or a replacement  were to be  reinstated, the EPA  rule or its  replacement
would  not necessarily affect the potential for liability in actions by either a
state or a private party under CERCLA or in actions under other federal or state
laws which may impose liability on "owners or operators" but do not  incorporate
the secured-creditor exemption. Traditionally, residential mortgage lenders have
not taken steps to evaluate whether hazardous wastes or hazardous substances are
present  with respect to any mortgaged property  prior to the origination of the
mortgage  loan  or  prior  to   foreclosure  or  accepting  a  deed-in-lieu   of
foreclosure.  Accordingly,  neither  the Seller,  Norwest  Mortgage  nor Norwest
Funding has  made such  evaluations prior  to the  origination of  the  Mortgage
Loans,   nor  does  Norwest  Mortgage  or  Norwest  Funding  require  that  such
evaluations be made by originators who  have sold the Mortgage Loans to  Norwest
Mortgage.  Neither the Seller nor Norwest  Mortgage is required to undertake any
such  evaluations  prior   to  foreclosure  or   accepting  a  deed-in-lieu   of
foreclosure.   Neither   the  Seller   nor   the  Master   Servicer   makes  any
representations or  warranties or  assumes  any liability  with respect  to  the
absence  or effect of hazardous wastes  or hazardous substances on any Mortgaged
Property or any  casualty resulting  from the  presence or  effect of  hazardous
wastes  or hazardous  substances. See  "The Trust  Estates --  Mortgage Loans --
Representations  and  Warranties"  and  "Servicing  of  the  Mortgage  Loans  --
Enforcement  of Due-on-Sale Clauses; Realization  Upon Defaulted Mortgage Loans"
above.
 
"DUE-ON-SALE" CLAUSES
 
    The forms  of note,  mortgage and  deed of  trust relating  to  conventional
Mortgage Loans may contain a "due-on-sale" clause permitting acceleration of the
maturity  of a loan if  the borrower transfers its  interest in the property. In
recent  years,  court  decisions  and  legislative  actions  placed  substantial
restrictions  on the right  of lenders to  enforce such clauses  in many states.
However, effective  October  15,  1982, Congress  enacted  the  Garn-St  Germain
Depository  Institutions Act of 1982 (the  "Garn Act") which purports to preempt
state laws which prohibit the enforcement of "due-on-sale" clauses by  providing
among  other matters, that  "due-on-sale" clauses in  certain loans (which loans
may include the Mortgage Loans)  made after the effective  date of the Garn  Act
are enforceable, within certain limitations as set forth in the Garn Act and the
regulations  promulgated thereunder. "Due-on-sale" clauses contained in mortgage
loans originated by  federal savings  and loan associations  or federal  savings
banks  are fully  enforceable pursuant  to regulations  of the  Office of Thrift
Supervision ("OTS"), as successor to the Federal Home Loan Bank Board ("FHLBB"),
which preempt  state  law  restrictions  on the  enforcement  of  such  clauses.
Similarly,  "due-on-sale" clauses in  mortgage loans made  by national banks and
federal  credit  unions  are  now  fully  enforceable  pursuant  to   preemptive
regulations  of the  Comptroller of the  Currency and the  National Credit Union
Administration, respectively.
 
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<PAGE>
    The  Garn  Act  created  a  limited  exemption  from  its  general  rule  of
enforceability  for  "due-on-sale" clauses  in  certain mortgage  loans ("Window
Period Loans") which were originated by non-federal lenders and made or  assumed
in  certain states ("Window Period States")  during the period, prior to October
15, 1982,  in  which that  state  prohibited the  enforcement  of  "due-on-sale"
clauses  by constitutional provision,  statute or statewide  court decision (the
"Window Period"). Though neither the Garn  Act nor the OTS regulations  actually
names  the Window Period States, the  Federal Home Loan Mortgage Corporation has
taken the  position,  in  prescribing mortgage  loan  servicing  standards  with
respect  to mortgage loans which it has purchased, that the Window Period States
were:  Arizona,  Arkansas,  California,   Colorado,  Georgia,  Iowa,   Michigan,
Minnesota,  New Mexico, Utah and Washington. Under the Garn Act, unless a Window
Period State took action by October 15,  1985, the end of the Window Period,  to
further  regulate enforcement of  "due-on-sale" clauses in  Window Period Loans,
"due-on-sale" clauses would become enforceable even in Window Period Loans. Five
of the Window Period States (Arizona, Minnesota, Michigan, New Mexico and  Utah)
have taken actions which restrict the enforceability of "due-on-sale" clauses in
Window  Period Loans beyond October 15, 1985.  The actions taken vary among such
states.
 
    By virtue  of  the  Garn Act,  a  Servicer  may generally  be  permitted  to
accelerate  any conventional Mortgage Loan which contains a "due-on-sale" clause
upon transfer of an interest in the property subject to the mortgage or deed  of
trust.  With respect to any Mortgage Loan  secured by a residence occupied or to
be occupied  by the  borrower, this  ability  to accelerate  will not  apply  to
certain  types of transfers, including (i)  the granting of a leasehold interest
which has a term of three years or less and which does not contain an option  to
purchase,  (ii) a transfer to a relative resulting from the death of a borrower,
or a transfer where the  spouse or children become an  owner of the property  in
each  case where  the transferee(s) will  occupy the property,  (iii) a transfer
resulting from a decree of  dissolution of marriage, legal separation  agreement
or  from an incidental property settlement agreement by which the spouse becomes
an owner of  the property,  (iv) the  creation of  a lien  or other  encumbrance
subordinate  to  the lender's  security instrument  which does  not relate  to a
transfer of rights  of occupancy  in the property  (provided that  such lien  or
encumbrance  is not created pursuant to a  contract for deed), (v) a transfer by
devise, descent or operation of law on the death of a joint tenant or tenant  by
the entirety, (vi) a transfer into an INTER VIVOS trust in which the borrower is
the  beneficiary and which does not relate to a transfer of rights of occupancy;
and (vii) other  transfers as  set forth  in the  Garn Act  and the  regulations
thereunder.  The extent of the  effect of the Garn Act  on the average lives and
delinquency rates of the Mortgage Loans cannot be predicted. See "Prepayment and
Yield Considerations."
 
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. The OTS as successor to the
FHLBB  is   authorized  to   issue  rules   and  regulations   and  to   publish
interpretations governing implementation of Title V.  The statute authorized 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.  Fifteen  states have  adopted laws  reimposing or  reserving the  right to
reimpose interest  rate  limits. In  addition,  even where  Title  V is  not  so
rejected,  any state is  authorized to adopt a  provision limiting certain other
loan charges.
 
    The Seller will represent and warrant in the Pooling and Servicing Agreement
to the Trustee for the benefit of Certificateholders that all Mortgage Loans are
originated in full compliance with applicable state laws, including usury  laws.
See  "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans to the
Trustee."
 
ENFORCEABILITY OF CERTAIN PROVISIONS
 
    Standard forms  of  note,  mortgage  and deed  of  trust  generally  contain
provisions  obligating the  borrower to  pay a late  charge if  payments are not
timely made  and  in some  circumstances  may  provide for  prepayment  fees  or
penalties  if the obligation is paid prior to maturity. In certain states, there
are
 
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<PAGE>
or may be specific limitations upon late charges which a lender may collect from
a borrower for delinquent payments. Certain states also limit the amounts that a
lender may  collect from  a borrower  as an  additional charge  if the  loan  is
prepaid.  Under the Pooling and Servicing Agreement, late charges and prepayment
fees (to the extent  permitted by law  and not waived by  the Servicer) will  be
retained by the Servicer as additional servicing compensation.
 
    Courts  have imposed  general equitable  principles upon  foreclosure. These
equitable principles are  generally designed  to relieve the  borrower from  the
legal effect of defaults under the loan documents. Examples of judicial remedies
that  may be fashioned  include judicial requirements  that the lender undertake
affirmative and expensive  actions to  determine the causes  for the  borrower's
default and the likelihood that the borrower will be able to reinstate the loan.
In  some cases, courts have substituted their judgment for the lender's judgment
and have required  lenders to  reinstate loans  or recast  payment schedules  to
accommodate  borrowers who are suffering from temporary financial disability. In
some cases, courts have limited the right of lenders to foreclose if the default
under the mortgage instrument is not  monetary, such as the borrower failing  to
adequately  maintain the property or the borrower executing a second mortgage or
deed of trust  affecting the  property. In other  cases, some  courts have  been
faced  with  the issue  of whether  federal  or state  constitutional provisions
reflecting due process concerns for adequate notice require that borrowers under
the deeds of  trust receive  notices in addition  to the  statutorily-prescribed
minimum  requirements. For  the most  part, these  cases have  upheld the notice
provisions as being reasonable or have found that the sale by a trustee under  a
deed  of trust  or under  a mortgage  having a  power of  sale does  not involve
sufficient state action to afford constitutional protections to the borrower.
 
                    CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    The following  general  discussion  represents the  opinion  of  Cadwalader,
Wickersham & Taft as to the anticipated material federal income tax consequences
of the purchase, ownership and disposition of Certificates. The discussion below
does  not purport  to address  all federal income  tax consequences  that may be
applicable to particular categories of investors,  some of which may be  subject
to  special rules. The authorities on which this discussion is based are subject
to change or differing  interpretations, and any  such change or  interpretation
could apply retroactively. This discussion reflects the applicable provisions of
the  Code, as well  as regulations (the "REMIC  Regulations") promulgated by the
U.S. Department of the Treasury on  December 23, 1992. Investors should  consult
their  own tax advisors in  determining the federal, state,  local and any other
tax  consequences  to  them  of  the  purchase,  ownership  and  disposition  of
Certificates.
 
    For  purposes of this discussion, where the applicable Prospectus Supplement
provides for a  Fixed Retained Yield  with respect  to the Mortgage  Loans of  a
Series of Certificates, references to the Mortgage Loans will be deemed to refer
to  that portion of  the Mortgage Loans held  by the Trust  Estate that does not
include   the   Fixed   Retained   Yield.   References   to   a   "Holder"    or
"Certificateholder"  in this discussion generally mean the beneficial owner of a
Certificate.
 
             FEDERAL INCOME TAX CONSEQUENCES FOR REMIC CERTIFICATES
 
GENERAL
 
    With respect to a particular Series of Certificates, an election may be made
to treat the Trust Estate or one  or more segregated pools of assets therein  as
one  or more REMICs within the meaning of Code Section 860D. A Trust Estate or a
portion or portions thereof as to which one or more REMIC elections will be made
will be  referred  to  as a  "REMIC  Pool."  For purposes  of  this  discussion,
Certificates  of a Series as  to which one or more  REMIC elections are made are
referred to as "REMIC Certificates" and will  consist of one or more Classes  of
"Regular  Certificates" and one Class of  "Residual Certificates" in the case of
each REMIC  Pool. Qualification  as  a REMIC  requires ongoing  compliance  with
certain   conditions.  With  respect  to  each  Series  of  REMIC  Certificates,
Cadwalader, Wickersham &  Taft, counsel to  the Seller, has  advised the  Seller
that  in the firm's opinion, assuming (i) the making of an appropriate election,
(ii) compliance with the Pooling and Servicing Agreement,
 
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<PAGE>
and (iii) compliance with  any changes in the  law, including any amendments  to
the  Code or  applicable Treasury regulations  thereunder, each  REMIC Pool will
qualify as a REMIC. In such case, the Regular Certificates will be considered to
be "regular  interests" in  the REMIC  Pool and  generally will  be treated  for
federal  income tax purposes as if  they were newly originated debt instruments,
and the Residual Certificates will be  considered to be "residual interests"  in
the  REMIC Pool. The Prospectus Supplement  for each Series of Certificates will
indicate whether one or more REMIC  elections with respect to the related  Trust
Estate will be made, in which event references to "REMIC" or "REMIC Pool" herein
shall be deemed to refer to each such REMIC Pool.
 
STATUS OF REMIC CERTIFICATES
 
    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 of the
REMIC Pool 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).  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 Regular  Certificates and
income with respect  to Residual  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 of the REMIC Pool would be so treated. If at
all times 95% or more of  the assets of the REMIC  Pool qualify for each of  the
foregoing  treatments, the REMIC Certificates will qualify for the corresponding
status in their entirety. For purposes of Code Section 856(c)(5)(A), payments of
principal and  interest  on  the  Mortgage Loans  that  are  reinvested  pending
distribution  to holders of REMIC Certificates qualify for such treatment. Where
two REMIC Pools are  a part of a  tiered structure they will  be treated as  one
REMIC  for purposes of  the tests described above  respecting asset ownership of
more or less than 95%. In addition, if the assets of the REMIC include  Buy-Down
Loans,   it  is  possible  that  the  percentage  of  such  assets  constituting
"loans...secured by an interest in real  property" for purposes of Code  Section
7701(a)(19)(C)(v)  may be required  to be reduced  by the amount  of the related
Buy-Down Funds. REMIC Certificates held  by a regulated investment company  will
not  constitute  "Government  securities"  within the  meaning  of  Code Section
851(b)(4)(A)(i). REMIC Certificates held by certain financial institutions  will
constitute  an "evidence  of indebtedness"  within the  meaning of  Code Section
582(c)(1). The Small Business Job Protection  Act of 1996 (the "SBJPA of  1996")
repealed  the  reserve  method  for  bad debts  of  domestic  building  and loan
associations and  mutual  savings  banks,  and thus  has  eliminated  the  asset
category  of "qualifying real property loans"  in former Code Section 593(d) for
taxable years beginning after December 31, 1995. The requirement in the SBJPA of
1996 that such  institutions must "recapture"  a portion of  their existing  bad
debt  reserves is suspended if a certain  portion of their assets are maintained
in "residential loans" under  Code Section 7701(a)(19)(C)(v),  but only if  such
loans  were made to acquire, construct or  improve the related real property and
NOT for the purpose of refinancing. However, no effort will be made to  identify
the portion of the Mortgage Loans of any Series meeting this requirement, and no
representation is made in this regard.
 
QUALIFICATION AS A REMIC
 
    In  order for the  REMIC Pool to qualify  as a REMIC,  there must be ongoing
compliance on the part of the REMIC Pool with the requirements set forth in  the
Code.  The REMIC Pool  must fulfill an  asset test, which  requires that no more
than a DE MINIMIS portion of  the assets of the REMIC  Pool, as of the close  of
the  third calendar month beginning after  the "Startup Day" (which for purposes
of this discussion is the date of issuance of the REMIC Certificates) and at all
times thereafter, may  consist of  assets other than  "qualified mortgages"  and
"permitted investments." The REMIC Regulations provide a safe harbor pursuant to
which  the DE  MINIMIS requirement  will be  met if  at all  times the aggregate
adjusted basis  of the  nonqualified assets  is less  than 1%  of the  aggregate
adjusted  basis of all the REMIC Pool's assets. An entity that fails to meet the
safe harbor may nevertheless demonstrate that it holds no more than a DE MINIMIS
amount of  nonqualified  assets. A  REMIC  Pool also  must  provide  "reasonable
arrangements" to prevent its residual interests from being held by "disqualified
 
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<PAGE>
organizations"  or agents thereof and must furnish applicable tax information to
transferors or agents that violate  this requirement. See "Taxation of  Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual Certificates --
Disqualified Organizations."
 
    A  qualified mortgage  is any obligation  that is principally  secured by an
interest in real property and  that is either transferred  to the REMIC Pool  on
the  Startup Day or is  purchased by the REMIC  Pool within a three-month period
thereafter pursuant to  a fixed  price contract in  effect on  the Startup  Day.
Qualified  mortgages include whole  mortgage loans, such  as the Mortgage Loans,
and, generally,  certificates of  beneficial interest  in a  grantor trust  that
holds  mortgage loans and regular interests in another REMIC, such as lower-tier
regular interests in a  tiered REMIC. The REMIC  Regulations specify that  loans
secured  by timeshare  interests and  shares held by  a tenant  stockholder in a
cooperative housing corporation can be qualified mortgages. A qualified mortgage
includes a qualified replacement mortgage, which is any property that would have
been treated as a qualified mortgage if it were transferred to the REMIC Pool on
the Startup Day and that  is received either (i)  in exchange for any  qualified
mortgage  within  a three-month  period  thereafter or  (ii)  in exchange  for a
"defective  obligation"  within  a  two-year  period  thereafter.  A  "defective
obligation"  includes  (i) a  mortgage  in default  or  as to  which  default is
reasonably foreseeable, (ii) a mortgage  as to which a customary  representation
or  warranty made at the  time of transfer to the  REMIC Pool has been breached,
(iii) a mortgage  that was fraudulently  procured by the  mortgagor, and (iv)  a
mortgage  that was not in fact principally secured by real property (but only if
such mortgage is disposed of within 90 days of discovery). A Mortgage Loan  that
is  "defective" as described in  clause (iv) that is not  sold or, if within two
years of the Startup Day, exchanged, within 90 days of discovery, ceases to be a
qualified mortgage after such 90-day period.
 
    Permitted investments  include  cash  flow  investments,  qualified  reserve
assets,  and  foreclosure property.  A cash  flow  investment is  an investment,
earning a return  in the  nature of  interest, of  amounts received  on or  with
respect  to qualified mortgages for a temporary period, not exceeding 13 months,
until the next scheduled distribution to holders of interests in the REMIC Pool.
A qualified reserve asset is any intangible property held for investment that is
part of any reasonably required reserve maintained by the REMIC Pool to  provide
for  payments of  expenses of the  REMIC Pool or  amounts due on  the regular or
residual interests in  the event  of defaults (including  delinquencies) on  the
qualified  mortgages,  lower  than  expected  reinvestment  returns,  prepayment
interest shortfalls and certain  other contingencies. The  reserve fund will  be
disqualified  if more than 30% of the gross  income from the assets in such fund
for the year is derived from the sale or other disposition of property held  for
less  than three  months, unless  required to prevent  a default  on the regular
interests caused by a default on one or more qualified mortgages. A reserve fund
must be reduced "promptly and appropriately"  as payments on the Mortgage  Loans
are  received. Foreclosure property is real  property acquired by the REMIC Pool
in connection with the default or  imminent default of a qualified mortgage  and
generally  held for  not more  than two  years, with  extensions granted  by the
Internal Revenue Service.
 
    In addition to the foregoing requirements, the various interests in a  REMIC
Pool  also must meet certain requirements. All  of the interests in a REMIC Pool
must be either of the following: (i) one or more classes of regular interests or
(ii) a single class  of residual interests on  which distributions, if any,  are
made  pro rata. A regular interest is an interest in a REMIC Pool that is issued
on the Startup Day with  fixed terms, is designated  as a regular interest,  and
unconditionally  entitles the holder to receive a specified principal amount (or
other similar amount),  and provides  that interest payments  (or other  similar
amounts), if any, at or before maturity either are payable based on a fixed rate
or  a qualified variable rate, or consist  of a specified, nonvarying portion of
the interest  payments on  qualified  mortgages. Such  a specified  portion  may
consist  of a  fixed number  of basis  points, a  fixed percentage  of the total
interest, or  a qualified  variable rate,  inverse variable  rate or  difference
between  two fixed or qualified  variable rates on some  or all of the qualified
mortgages. The specified principal  amount of a  regular interest that  provides
for  interest payments consisting of a specified, nonvarying portion of interest
payments on qualified mortgages may be zero. A residual interest is an  interest
in  a REMIC Pool other than a regular interest that is issued on the Startup Day
and that is designated as a residual
 
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<PAGE>
interest. An interest in a REMIC Pool may be treated as a regular interest  even
if  payments  of principal  with respect  to such  interest are  subordinated to
payments on other regular interests or the residual interest in the REMIC  Pool,
and  are  dependent on  the absence  of defaults  or delinquencies  on qualified
mortgages or permitted  investments, lower than  reasonably expected returns  on
permitted  investments,  unanticipated expenses  incurred by  the REMIC  Pool or
prepayment interest  shortfalls.  Accordingly,  the Regular  Certificates  of  a
Series  will  constitute  one or  more  classes  of regular  interests,  and the
Residual Certificates with respect to that Series will constitute a single class
of residual interests on which distributions are made pro rata.
 
    If an entity, such as  the REMIC Pool, 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  this event,  an entity  with multiple  classes of ownership
interests may be  treated as  a separate  association taxable  as a  corporation
under  Treasury  regulations, and  the Regular  Certificates  may be  treated as
equity interests therein. The Code, however, authorizes the Treasury  Department
to  issue regulations that address situations where  failure to meet one or more
of the requirements for REMIC status occurs inadvertently and in good faith, and
disqualification of  the  REMIC  Pool  would  occur  absent  regulatory  relief.
Investors  should be aware, however, that the Conference Committee Report to the
Tax Reform  Act of  1986  (the "1986  Act") indicates  that  the relief  may  be
accompanied  by sanctions, such as the imposition of a corporate tax on all or a
portion of  the  REMIC  Pool's income  for  the  period of  time  in  which  the
requirements for REMIC status are not satisfied.
 
TAXATION OF REGULAR CERTIFICATES
 
    GENERAL
 
    In  general, interest,  original issue  discount, and  market discount  on a
Regular Certificate  will be  treated as  ordinary  income to  a holder  of  the
Regular Certificate (the "Regular Certificateholder"), and principal payments on
a  Regular Certificate will be  treated as a return of  capital to the extent of
the Regular  Certificateholder's  basis  in the  Regular  Certificate  allocable
thereto.  Regular Certificateholders must  use the accrual  method of accounting
with regard  to Regular  Certificates, regardless  of the  method of  accounting
otherwise used by such Regular Certificateholders.
 
    ORIGINAL ISSUE DISCOUNT
 
    Compound  Interest  Certificates  will  be,  and  other  classes  of Regular
Certificates may be, issued with "original issue discount" within the meaning of
Code Section 1273(a). Holders of any  Class or Subclass of Regular  Certificates
having original issue discount generally must include original issue discount in
ordinary  income for  federal income tax  purposes as it  accrues, in accordance
with a  constant interest  method that  takes into  account the  compounding  of
interest,  in advance of  receipt of the  cash attributable to  such income. The
following  discussion  is  based  in  part  on  temporary  and  final   Treasury
regulations  issued on February 2, 1994, as  amended on June 14, 1996, (the "OID
Regulations") under Code Sections 1271 through 1273 and 1275 and in part on  the
provisions of the 1986 Act. Regular Certificateholders should be aware, however,
that  the OID Regulations  do not adequately address  certain issues relevant to
prepayable securities,  such as  the Regular  Certificates. To  the extent  such
issues  are not addressed in  such regulations, the Seller  intends to apply the
methodology described in  the Conference Committee  Report to the  1986 Act.  No
assurance  can be  provided that  the Internal Revenue  Service will  not take a
different position  as to  those  matters not  currently  addressed by  the  OID
Regulations.  Moreover, the OID Regulations  include an anti-abuse rule allowing
the Internal Revenue Service to apply  or depart from the OID Regulations  where
necessary  or appropriate  to ensure  a reasonable  tax result  in light  of the
applicable  statutory  provisions.   A  tax  result   will  not  be   considered
unreasonable under the anti-abuse rule in the absence of a substantial effect on
the  present  value of  a  taxpayer's tax  liability.  Investors are  advised to
consult their own tax advisors as  to the discussion herein and the  appropriate
method  for reporting interest  and original issue discount  with respect to the
Regular Certificates.
 
    Each Regular Certificate (except to the extent described below with  respect
to  a  Regular  Certificate  on  which  principal  is  distributed  in  a single
installment or by lots of specified principal amounts
 
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<PAGE>
upon the  request of  a Certificateholder  or  by random  lot (a  "Non-Pro  Rata
Certificate"))  will be treated as a  single installment obligation for purposes
of  determining   the  original   issue  discount   includible  in   a   Regular
Certificateholder's  income. The  total amount of  original issue  discount on a
Regular Certificate is the excess of  the "stated redemption price at  maturity"
of the Regular Certificate over its "issue price." The issue price of a Class of
Regular  Certificates offered pursuant to this Prospectus generally is the first
price at  which  a substantial  amount  of such  Class  is sold  to  the  public
(excluding  bond houses, brokers  and underwriters). Although  unclear under the
OID Regulations, the Seller intends  to treat the issue price  of a Class as  to
which  there is no substantial sale as of  the issue date or that is retained by
the Seller as  the fair market  value of that  Class as of  the issue date.  The
issue price of a Regular Certificate also includes any amount paid by an initial
Regular Certificateholder for accrued interest that relates to a period prior to
the  issue date of the Regular Certificate, unless the Regular Certificateholder
elects on its federal income  tax return to exclude  such amount from the  issue
price  and to recover it  on the first Distribution  Date. The stated redemption
price at  maturity  of  a  Regular  Certificate  always  includes  the  original
principal  amount of  the Regular  Certificate, but  generally will  not include
distributions of  interest if  such distributions  constitute "qualified  stated
interest."  Under the OID Regulations, qualified stated interest generally means
interest payable  at  a single  fixed  rate or  a  qualified variable  rate  (as
described  below)  provided  that  such  interest  payments  are unconditionally
payable at intervals of one year or  less during the entire term of the  Regular
Certificate.  Because  there is  no penalty  or  default remedy  in the  case of
nonpayment of interest  with respect to  a Regular Certificate,  it is  possible
that  no  interest on  any  Class of  Regular  Certificates will  be  treated as
qualified stated interest. However,  except as provided  in the following  three
sentences  or in  the applicable  Prospectus Supplement,  because the underlying
Mortgage Loans provide for remedies in the event of default, the Seller  intends
to  treat interest with respect to  the Regular Certificates as qualified stated
interest. Distributions of interest  on a Compound  Interest Certificate, or  on
other  Regular Certificates with respect to which deferred interest will accrue,
will not  constitute  qualified  stated  interest,  in  which  case  the  stated
redemption   price  at  maturity  of  such  Regular  Certificates  includes  all
distributions of interest  as well  as principal thereon.  Likewise, the  Seller
intends  to  treat  an interest-only  Class  or  a Class  on  which  interest is
substantially  disproportionate   to   its   principal   amount   (a   so-called
"super-premium"  Class)  as  having  no  qualified  stated  interest.  Where the
interval between the  issue date and  the first Distribution  Date on a  Regular
Certificate  is shorter than the interval between subsequent Distribution Dates,
the interest attributable to the additional days will be included in the  stated
redemption price at maturity.
 
    Under  a DE MINIMIS  rule, original issue discount  on a 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 Regular Certificate multiplied
by the weighted average maturity of  the Regular Certificate. For this  purpose,
the  weighted average maturity of the Regular Certificate is computed as the sum
of the  amounts  determined by  multiplying  the  number of  full  years  (I.E.,
rounding  down partial  years) from  the issue  date until  each distribution in
reduction of stated redemption price  at maturity is scheduled  to be made by  a
fraction,  the numerator of which is the amount of each distribution included in
the stated  redemption price  at maturity  of the  Regular Certificate  and  the
denominator  of which is the stated redemption  price at maturity of the Regular
Certificate. The Conference Committee Report to  the 1986 Act provides that  the
schedule  of  such distributions  should be  determined  in accordance  with the
assumed rate of prepayment of  the Mortgage Loans (the "Prepayment  Assumption")
and  the  anticipated  reinvestment  rate,  if  any,  relating  to  the  Regular
Certificates. The  Prepayment Assumption  with respect  to a  Series of  Regular
Certificates  will be set forth in the applicable Prospectus Supplement. Holders
generally must report DE MINIMIS original  issue discount pro rata as  principal
payments  are received,  and such  income will  be capital  gain if  the Regular
Certificate is held  as a  capital asset.  Under the  OID Regulations,  however,
Regular  Certificateholders may  elect to accrue  all DE  MINIMIS original issue
discount as well as market discount and market premium, under the constant yield
method. See "Election to Treat All Interest Under the Constant Yield Method."
 
    A Regular Certificateholder generally must  include in gross income for  any
taxable  year the sum of the "daily portions," as defined below, of the original
issue discount on the Regular Certificate
 
                                       70
<PAGE>
accrued during an  accrual period for  each day  on which it  holds the  Regular
Certificate,   including  the  date  of  purchase  but  excluding  the  date  of
disposition. The Seller will treat the  monthly period ending on the day  before
each  Distribution  Date as  the accrual  period. With  respect to  each Regular
Certificate, a calculation  will be  made of  the original  issue discount  that
accrues  during each successive full accrual  period (or shorter period from the
date of original  issue) that ends  on the day  before the related  Distribution
Date on the Regular Certificate. The Conference Committee Report to the 1986 Act
states  that the rate  of accrual of  original issue discount  is intended to be
based on the Prepayment Assumption. Other  than as discussed below with  respect
to  a Non-Pro Rata Certificate,  the original issue discount  accruing in a full
accrual period would be the  excess, if any, of (i)  the sum of (a) the  present
value  of  all  of  the  remaining  distributions  to  be  made  on  the Regular
Certificate as of the end of that accrual period, and (b) the distributions made
on the Regular Certificate  during the accrual period  that are included in  the
Regular  Certificate's  stated  redemption  price  at  maturity,  over  (ii) the
adjusted issue price of the Regular Certificate at the beginning of the  accrual
period.  The present  value of  the remaining  distributions referred  to in the
preceding sentence  is calculated  based on  (i) the  yield to  maturity of  the
Regular   Certificate  at  the   issue  date,  (ii)   events  (including  actual
prepayments) that have  occurred prior  to the end  of the  accrual period,  and
(iii) the Prepayment Assumption. For these purposes, the adjusted issue price of
a  Regular Certificate at the  beginning of any accrual  period equals the issue
price of the Regular Certificate, increased by the aggregate amount of  original
issue discount with respect to the Regular Certificate that accrued in all prior
accrual  periods  and reduced  by the  amount of  distributions included  in the
Regular Certificate's stated redemption price at maturity that were made on  the
Regular  Certificate in such prior periods. The original issue discount accruing
during any accrual period (as determined in this paragraph) will then be divided
by the number of days in the  period to determine the daily portion of  original
issue  discount for each day  in the period. With  respect to an initial accrual
period shorter than a full accrual period, the daily portions of original  issue
discount  must be  determined according to  an appropriate  allocation under any
reasonable method.
 
    Under the  method described  above,  the daily  portions of  original  issue
discount  required  to  be included  in  income by  a  Regular Certificateholder
generally will  increase  to  take  into  account  prepayments  on  the  Regular
Certificates  as a result of  prepayments on the Mortgage  Loans that exceed the
Prepayment Assumption, and generally will decrease  (but not below zero for  any
period)  if  the  prepayments  are slower  than  the  Prepayment  Assumption. An
increase in  prepayments on  the Mortgage  Loans  with respect  to a  Series  of
Regular  Certificates can result in  both a change in  the priority of principal
payments with respect to certain Classes  of Regular Certificates and either  an
increase  or  decrease in  the daily  portions of  original issue  discount with
respect to such Regular Certificates.
 
    In the case of a Non-Pro  Rata Certificate, the Seller intends to  determine
the  yield to  maturity of such  Certificate based upon  the anticipated payment
characteristics of the  Class as  a whole  under the  Prepayment Assumption.  In
general,  the original issue discount accruing  on each Non-Pro Rata Certificate
in a full  accrual period would  be its  allocable share of  the original  issue
discount  with respect to the entire Class, as determined in accordance with the
preceding paragraph. However, in the case of a distribution in retirement of the
entire unpaid principal balance of any  Non-Pro Rata Certificate (or portion  of
such  unpaid  principal balance),  (a)  the remaining  unaccrued  original issue
discount allocable to such Certificate (or  to such portion) will accrue at  the
time  of  such distribution,  and  (b) the  accrual  of original  issue discount
allocable to each remaining Certificate of  such Class (or the remaining  unpaid
principal  balance  of a  partially redeemed  Non-Pro  Rata Certificate  after a
distribution of principal has  been received) will be  adjusted by reducing  the
present  value of the  remaining payments on  such Class and  the adjusted issue
price of such  Class to the  extent attributable  to the portion  of the  unpaid
principal  balance thereof  that was distributed.  The Seller  believes that the
foregoing treatment is consistent  with the "pro rata  prepayment" rules of  the
OID  Regulations,  but  with the  rate  of  accrual of  original  issue discount
determined based  on  the  Prepayment  Assumption for  the  Class  as  a  whole.
Investors are advised to consult their tax advisors as to this treatment.
 
                                       71
<PAGE>
    ACQUISITION PREMIUM
 
    A  purchaser of a Regular  Certificate at a price  greater than its adjusted
issue price  but less  than its  stated  redemption price  at maturity  will  be
required  to include in  gross income the  daily portions of  the original issue
discount on  the  Regular  Certificate  reduced pro  rata  by  a  fraction,  the
numerator  of which is the excess of its purchase price over such adjusted issue
price and  the  denominator of  which  is the  excess  of the  remaining  stated
redemption  price at maturity over the adjusted issue price. Alternatively, such
a subsequent purchaser may elect to treat all such acquisition premium under the
constant yield method, as described below  under the heading "Election to  Treat
All Interest Under the Constant Yield Method."
 
    VARIABLE RATE REGULAR CERTIFICATES
 
    Regular  Certificates may  provide for  interest based  on a  variable rate.
Under the OID Regulations, interest is treated as payable at a variable rate if,
generally, (i) the issue price does not exceed the original principal balance by
more than a specified amount  and (ii) the interest  compounds or is payable  at
least  annually at current values of (a) one or more "qualified floating rates,"
(b) a single fixed rate and one  or more qualified floating rates, (c) a  single
"objective rate," or (d) a single fixed rate and a single objective rate that is
a  "qualified inverse  floating rate." A  floating rate is  a qualified floating
rate  if  variations  in  the  rate  can  reasonably  be  expected  to   measure
contemporaneous  variations in the cost of newly borrowed funds, where such rate
is subject to a fixed multiple that is greater than 0.65 but not more than 1.35.
Such rate may also be increased or decreased  by a fixed spread or subject to  a
fixed  cap or floor, or a cap or floor that is not reasonably expected as of the
issue date to  affect the yield  of the instrument  significantly. An  objective
rate is any rate (other than a qualified floating rate) that is determined using
a  single fixed  formula and  that is based  on objective  financial or economic
information, provided that such information is not (i) within the control of the
issuer or a related party or (ii) unique to the circumstances of the issuer or a
related party. A qualified inverse floating rate is a rate equal to a fixed rate
minus  a  qualified  floating  rate  that  inversely  reflects   contemporaneous
variations in the cost of newly borrowed funds; an inverse floating rate that is
not  a qualified inverse floating rate may  nevertheless be an objective rate. A
Class of Regular Certificates may be issued under this Prospectus that does  not
have  a variable rate under the foregoing rules, for example, a Class that bears
different rates at different times during the period it is outstanding such that
it is  considered  significantly  "front-loaded"  or  "back-loaded"  within  the
meaning  of  the  OID Regulations.  It  is possible  that  such a  Class  may be
considered  to  bear  "contingent  interest"  within  the  meaning  of  the  OID
Regulations.  The OID Regulations, as they relate to the treatment of contingent
interest, are by their terms not applicable to Regular Certificates. However, if
final regulations  dealing  with contingent  interest  with respect  to  Regular
Certificates  apply the same principles as the OID Regulations, such regulations
may lead to different timing  of income inclusion than  would be the case  under
the  OID Regulations. Furthermore, application of  such principles could lead to
the characterization  of  gain  on  the  sale  of  contingent  interest  Regular
Certificates  as ordinary  income. Investors  should consult  their tax advisors
regarding the appropriate treatment of any Regular Certificate that does not pay
interest at a fixed rate or variable rate as described in this paragraph.
 
    Under the REMIC Regulations, a Regular  Certificate (i) bearing a rate  that
qualifies  as a variable rate under the  OID Regulations that is tied to current
values of a  variable rate (or  the highest, lowest  or average of  two or  more
variable  rates, including a rate  based on the average cost  of funds of one or
more financial institutions), or a positive or negative multiple of such a  rate
(plus  or  minus a  specified  number of  basis  points), or  that  represents a
weighted average of rates on some or all of the Mortgage Loans, including such a
rate that is subject to one or more caps or floors, or (ii) bearing one or  more
such  variable rates for one or more periods, or one or more fixed rates for one
or more periods, and a different variable rate or fixed rate for other  periods,
qualifies  as  a  regular interest  in  a REMIC.  Accordingly,  unless otherwise
indicated in the applicable Prospectus  Supplement, the Seller intends to  treat
Regular  Certificates that qualify  as regular interests under  this rule in the
same manner as obligations bearing a  variable rate for original issue  discount
reporting purposes.
 
                                       72
<PAGE>
    The  amount of original issue discount with respect to a Regular Certificate
bearing a variable rate  of interest will accrue  in the manner described  above
under  "Original Issue Discount," with the yield to maturity and future payments
on such Regular Certificate generally to be determined by assuming that interest
will be payable for  the life of  the Regular Certificate  based on the  initial
rate  (or, if  different, the value  of the  applicable variable rate  as of the
pricing date) for the  relevant Class. Unless  required otherwise by  applicable
final  regulations,  the  Seller  intends to  treat  such  variable  interest as
qualified stated interest, other than  variable interest on an interest-only  or
super-premium  Class,  which will  be treated  as non-qualified  stated interest
includible  in  the  stated  redemption  price  at  maturity.  Ordinary   income
reportable  for any period will  be adjusted based on  subsequent changes in the
applicable interest rate index.
 
    Although unclear under  the OID  Regulations, unless  required otherwise  by
applicable  final regulations, the Seller  intends to treat Regular Certificates
bearing an interest rate that is a weighted average of the net interest rates on
Mortgage Loans as having  qualified stated interest, except  to the extent  that
initial  "teaser" rates cause sufficiently "back-loaded" interest to create more
than DE MINIMIS original issue discount. The yield on such Regular  Certificates
for  purposes of accruing  original issue discount will  be a hypothetical fixed
rate based on the  fixed rates, in  the case of fixed  rate Mortgage Loans,  and
initial  "teaser  rates"  followed  by  fully  indexed  rates,  in  the  case of
adjustable rate Mortgage Loans. In the  case of adjustable rate Mortgage  Loans,
the applicable index used to compute interest on the Mortgage Loans in effect on
the  pricing date (or  possibly the issue date)  will be deemed  to be in effect
beginning with the period  in which the first  weighted average adjustment  date
occurring  after the issue date occurs. Adjustments will be made in each accrual
period either increasing or decreasing the amount of ordinary income  reportable
to reflect the actual Pass-Through Rate on the Regular Certificates.
 
    MARKET DISCOUNT
 
    A  purchaser of  a Regular  Certificate also  may be  subject to  the market
discount rules of Code Sections 1276 through 1278. Under these sections and  the
principles  applied  by the  OID Regulations  in the  context of  original issue
discount, "market  discount" is  the amount  by which  the purchaser's  original
basis  in the Regular Certificate (i)  is exceeded by the then-current principal
amount of the Regular Certificate, or (ii) in the case of a Regular  Certificate
having  original issue discount, is exceeded by the adjusted issue price of such
Regular Certificate at the  time of purchase. Such  purchaser generally will  be
required  to recognize ordinary income to  the extent of accrued market discount
on such Regular Certificate as distributions includible in the stated redemption
price at maturity  thereof are  received, in an  amount not  exceeding any  such
distribution.  Such market discount would  accrue in a manner  to be provided in
Treasury regulations and should take into account the Prepayment Assumption. The
Conference Committee Report to the 1986 Act provides that until such regulations
are issued, such  market discount  would accrue  either (i)  on the  basis of  a
constant interest rate, or (ii) in the ratio of stated interest allocable to the
relevant  period to the sum  of the interest for  such period plus the remaining
interest as of the end of such period,  or in the case of a Regular  Certificate
issued  with original  issue discount, in  the ratio of  original issue discount
accrued for  the relevant  period to  the  sum of  the original  issue  discount
accrued for such period plus the remaining original issue discount as of the end
of  such  period. Such  purchaser also  generally  will be  required to  treat a
portion of any gain on a sale or exchange of the 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 as partial distributions in reduction of the  stated
redemption  price at maturity were received.  Such purchaser will be required to
defer deduction of a portion  of the excess of the  interest paid or accrued  on
indebtedness  incurred  to  purchase or  carry  a Regular  Certificate  over the
interest distributable thereon. The deferred portion of such interest expense in
any taxable year generally  will not exceed the  accrued market discount on  the
Regular  Certificate for  such year. Any  such deferred interest  expense is, in
general, allowed as a  deduction not later  than the year  in which the  related
market  discount income is recognized or the Regular Certificate is disposed of.
As an alternative to the inclusion of market discount in income on the foregoing
basis, the Regular Certificateholder may elect
 
                                       73
<PAGE>
to include  market discount  in income  currently as  it accrues  on all  market
discount  instruments acquired by such Regular Certificateholder in that taxable
year or thereafter, in which case the interest deferral rule will not apply. See
"Election to Treat All Interest Under the Constant Yield Method" below regarding
an alternative manner in which such election may be deemed to be made.
 
    By analogy to the OID Regulations, market discount with respect to a Regular
Certificate will be considered to be zero  if such market discount is less  than
0.25%  of  the remaining  stated redemption  price at  maturity of  such Regular
Certificate  multiplied  by  the  weighted  average  maturity  of  the   Regular
Certificate  (determined  as  described  above  in  the  third  paragraph  under
"Original Issue Discount") remaining after the date of purchase. It appears that
DE MINIMIS market discount would be reported  in a manner similar to DE  MINIMIS
original   issue  discount.  See  "Original   Issue  Discount"  above.  Treasury
regulations implementing the market discount rules have not yet been issued, and
therefore  investors  should  consult  their  own  tax  advisors  regarding  the
application  of  these rules.  Investors should  also consult  Revenue Procedure
92-67 concerning the elections  to include market  discount in income  currently
and to accrue market discount on the basis of the constant yield method.
 
    PREMIUM
 
    A  Regular Certificate purchased at a cost greater than its remaining stated
redemption price  at maturity  generally  is considered  to  be purchased  at  a
premium.  If the Regular  Certificateholder holds such  Regular Certificate as a
"capital  asset"  within  the  meaning   of  Code  Section  1221,  the   Regular
Certificateholder  may elect  under Code  Section 171  to amortize  such premium
under  the  constant  yield  method.  Such  election  will  apply  to  all  debt
obligations  acquired by the Regular Certificateholder at a premium held in that
taxable year or thereafter, unless revoked  with the permission of the  Internal
Revenue  Service. The  Conference Committee Report  to the 1986  Act indicates a
Congressional intent that  the same rules  that apply to  the accrual of  market
discount  on installment obligations will also  apply to amortizing bond premium
under  Code  Section  171  on  installment  obligations  such  as  the   Regular
Certificates,  although it is  unclear whether the  alternatives to the constant
interest  method  described  above   under  "Market  Discount"  are   available.
Amortizable  bond premium will be  treated as an offset  to interest income on a
Regular Certificate, rather than as a separate deduction item. See "Election  to
Treat  All  Interest  Under  the  Constant  Yield  Method"  below  regarding  an
alternative manner in which the  Code Section 171 election  may be deemed to  be
made.
 
    ELECTION TO TREAT ALL INTEREST UNDER THE CONSTANT YIELD METHOD
 
    A  holder of a  debt instrument such  as a Regular  Certificate may elect to
treat all  interest that  accrues on  the instrument  using the  constant  yield
method,  with none of  the interest being treated  as qualified stated interest.
For purposes of applying the constant yield method to a debt instrument  subject
to  such an  election, (i) "interest"  includes stated  interest, original issue
discount, DE MINIMIS  original issue  discount, market discount  and DE  MINIMIS
market  discount, as  adjusted by  any amortizable  bond premium  or acquisition
premium and (ii) the debt instrument is treated as if the instrument were issued
on the holder's acquisition  date in the amount  of the holder's adjusted  basis
immediately  after acquisition.  It is  unclear whether,  for this  purpose, the
initial Prepayment Assumption  would continue to  apply or if  a new  prepayment
assumption  as of  the date  of the holder's  acquisition would  apply. A holder
generally may make such an election on an instrument by instrument basis or  for
a  class or  group of  debt instruments.  However, if  the holder  makes such an
election with respect to a debt instrument with amortizable bond premium or with
market discount, the holder  is deemed to have  made elections to amortize  bond
premium  or to report market  discount income currently as  it accrues under the
constant yield  method,  respectively, for  all  premium bonds  held  or  market
discount  bonds acquired by the  holder in the same  taxable year or thereafter.
The election is made on the holder's  federal income tax return for the year  in
which  the  debt  instrument is  acquired  and  is irrevocable  except  with the
approval of the Internal Revenue Service. Investors should consult their own tax
advisors regarding the advisability of making such an election.
 
                                       74
<PAGE>
    TREATMENT OF LOSSES
 
    Regular Certificateholders will be required to report income with respect to
Regular Certificates on the accrual method of accounting, without giving  effect
to   delays  or  reductions   in  distributions  attributable   to  defaults  or
delinquencies on the Mortgage Loans, except to the extent it can be  established
that  such  losses  are  uncollectible. Accordingly,  the  holder  of  a Regular
Certificate, particularly a  Subordinated Certificate, may  have income, or  may
incur a diminution in cash flow as a result of a default or delinquency, but may
not  be  able to  take a  deduction (subject  to the  discussion below)  for the
corresponding loss until a  subsequent taxable year.  In this regard,  investors
are  cautioned that while they may generally  cease to accrue interest income if
it reasonably  appears that  the interest  will be  uncollectible, the  Internal
Revenue Service may take the position that original issue discount must continue
to  be accrued  in spite  of its uncollectibility  until the  debt instrument is
disposed of in a taxable transaction or becomes worthless in accordance with the
rules of Code Section 166. To the extent the rules of Code Section 166 regarding
bad debts are applicable,  it appears that  Regular Certificateholders that  are
corporations  or that otherwise hold the Regular Certificates in connection with
a trade or business should in general  be allowed to deduct as an ordinary  loss
such loss with respect to principal sustained during the taxable year on account
of  any such  Regular Certificates becoming  wholly or  partially worthless, and
that, in general, Regular  Certificateholders that are  not corporations and  do
not  hold the Regular Certificates in connection with a trade or business should
be allowed to deduct as a short-term capital loss any loss sustained during  the
taxable  year on account of a portion  of any such Regular Certificates becoming
wholly worthless. Although the matter is not free from doubt, such non-corporate
Regular Certificateholders should be allowed a  bad debt deduction at such  time
as  the principal  balance of  such Regular  Certificates is  reduced to reflect
losses resulting  from  any  liquidated Mortgage  Loans.  The  Internal  Revenue
Service,  however, could  take the position  that non-corporate  holders will be
allowed a bad debt deduction to reflect such losses only after all the  Mortgage
Loans remaining in the Trust Estate have been liquidated or the applicable Class
of Regular Certificates has been otherwise retired. The Internal Revenue Service
could  also assert that losses on  the Regular Certificates are deductible based
on some other method  that may defer  such deductions for  all holders, such  as
reducing  future cash  flow for purposes  of computing  original issue discount.
This may have the  effect of creating "negative"  original issue discount  which
would  be deductible  only against  future positive  original issue  discount or
otherwise upon termination of the Class. Regular Certificateholders are urged to
consult their  own tax  advisors regarding  the appropriate  timing, amount  and
character of any loss sustained with respect to such Regular Certificates. While
losses  attributable  to  interest  previously  reported  as  income  should  be
deductible as ordinary losses by  both corporate and non-corporate holders,  the
Internal  Revenue  Service may  take the  position  that losses  attributable to
accrued original issue discount  may only be deducted  as capital losses in  the
case  of  non-corporate holders  who  do not  hold  the Regular  Certificates in
connection with a trade or business. Special loss rules are applicable to  banks
and  thrift institutions, including rules regarding reserves for bad debts. Such
taxpayers are advised to consult their  tax advisors regarding the treatment  of
losses on Regular Certificates.
 
    SALE OR EXCHANGE OF REGULAR CERTIFICATES
 
    If a Regular Certificateholder sells or exchanges a Regular Certificate, the
Regular  Certificateholder will recognize gain or  loss equal to the difference,
if any,  between the  amount received  and  its adjusted  basis in  the  Regular
Certificate.  The adjusted basis  of a Regular  Certificate generally will equal
the cost of  the Regular Certificate  to the seller,  increased by any  original
issue  discount or  market discount  previously included  in the  seller's gross
income with respect to the Regular  Certificate and reduced by amounts  included
in  the stated redemption price at maturity of the Regular Certificate that were
previously received  by  the  seller,  by  any  amortized  premium  and  by  any
recognized losses.
 
    Except  as described  above with respect  to market discount,  and except as
provided in  this paragraph,  any gain  or loss  on the  sale or  exchange of  a
Regular Certificate realized by an investor who holds the Regular Certificate as
a  capital  asset  will  be  capital  gain or  loss  and  will  be  long-term or
 
                                       75
<PAGE>
short-term depending on whether  the Regular Certificate has  been held for  the
long-term capital gain holding period (currently, more than one year). Such gain
will  be treated as ordinary income (i) if a Regular Certificate is held as part
of a "conversion  transaction" as  defined in Code  Section 1258(c),  up to  the
amount  of interest that  would have accrued  on the Regular Certificateholder's
net investment  in  the  conversion  transaction  at  120%  of  the  appropriate
applicable  Federal rate under  Code Section 1274(d)  in effect at  the time the
taxpayer entered into  the transaction  minus any amount  previously treated  as
ordinary  income with respect to any prior disposition of property that was held
as part of such transaction,  (ii) in the case  of a non-corporate taxpayer,  to
the  extent such taxpayer has  made an election under  Code Section 163(d)(4) to
have net capital gains taxed as  investment income at ordinary income rates,  or
(iii)  to the extent that such  gain does not exceed the  excess, if any, of (a)
the amount that would have been includible in the gross income of the holder  if
its  yield on such Regular Certificate were  110% of the applicable Federal rate
as of the date of purchase, over (b) the amount of income actually includible in
the gross income  of such holder  with respect to  such Regular Certificate.  In
addition,  gain or  loss recognized  from the sale  of a  Regular Certificate by
certain banks or thrift institutions will be treated as ordinary income or  loss
pursuant  to Code Section 582(c). Pursuant  to the Revenue Reconciliation Act of
1993, capital gains of  certain non-corporate taxpayers are  subject to a  lower
maximum  tax rate than ordinary  income of such taxpayers.  The maximum tax rate
for corporations is the  same with respect to  both ordinary income and  capital
gains.
 
TAXATION OF RESIDUAL CERTIFICATES
 
    TAXATION OF REMIC INCOME
 
    Generally,  the "daily portions" of REMIC taxable income or net loss will be
includible as ordinary income or loss in determining the federal taxable  income
of  holders of Residual Certificates ("Residual Holders"), and will not be taxed
separately to the REMIC Pool. The daily portions of REMIC taxable income or  net
loss  of a Residual Holder are determined by allocating the REMIC Pool's taxable
income or net loss for each calendar quarter ratably to each day in such quarter
and by allocating such daily portion among the Residual Holders in proportion to
their respective holdings  of Residual Certificates  in the REMIC  Pool on  such
day.  REMIC taxable  income is  generally determined in  the same  manner as the
taxable income of an individual using  the accrual method of accounting,  except
that  (i) the  limitations on deductibility  of investment  interest expense and
expenses for the production of income do  not apply, (ii) all bad loans will  be
deductible  as business bad debts, and (iii) the limitation on the deductibility
of interest and  expenses related  to tax-exempt  income will  apply. The  REMIC
Pool's  gross  income includes  interest,  original issue  discount  income, and
market discount income, if any, on  the Mortgage Loans, reduced by  amortization
of  any premium on  the Mortgage Loans,  plus income from  amortization of issue
premium, if any,  on the Regular  Certificates, plus income  on reinvestment  of
cash flows and reserve assets, plus any cancellation of indebtedness income upon
allocation  of realized  losses to  the Regular  Certificates. The  REMIC Pool's
deductions include interest and original  issue discount expense on the  Regular
Certificates,  servicing  fees  on  the  Mortgage  Loans,  other  administrative
expenses of  the REMIC  Pool and  realized  losses on  the Mortgage  Loans.  The
requirement  that Residual Holders report their pro rata share of taxable income
or net loss of the REMIC Pool  will continue until there are no Certificates  of
any class of the related Series outstanding.
 
    The  taxable income recognized by a Residual Holder in any taxable year will
be affected by,  among other  factors, the  relationship between  the timing  of
recognition of interest and original issue discount or market discount income or
amortization of premium with respect to the Mortgage Loans, on the one hand, and
the  timing of  deductions for interest  (including original  issue discount) or
income from amortization of  issue premium on the  Regular Certificates, on  the
other  hand. In the event that an interest  in the Mortgage Loans is acquired by
the REMIC Pool at a discount, and one or more of such Mortgage Loans is prepaid,
the Residual  Holder may  recognize  taxable income  without being  entitled  to
receive a corresponding amount of cash because (i) the prepayment may be used in
whole  or in  part to  make distributions  in reduction  of principal  or Stated
Amount on the Regular Certificates, and (ii) the discount on the Mortgage  Loans
which  is  includible  in income  may  exceed  the deduction  allowed  upon such
distributions on those Regular Certificates on account of any unaccrued original
 
                                       76
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issue discount relating to those Regular  Certificates. When there is more  than
one  Class  of Regular  Certificates that  distribute  principal or  payments in
reduction  of  Stated  Amount  sequentially,  this  mismatching  of  income  and
deductions is particularly likely to occur in the early years following issuance
of  the Regular  Certificates when  distributions in  reduction of  principal or
Stated  Amount  are  being  made  in  respect  of  earlier  Classes  of  Regular
Certificates  to the  extent that such  Classes are not  issued with substantial
discount or are issued at  a premium. If taxable  income attributable to such  a
mismatching  is realized, in general, losses would  be allowed in later years as
distributions on the later  maturing Classes of  Regular Certificates are  made.
Taxable  income may also  be greater in earlier  years than in  later years as a
result of the fact that interest  expense deductions, expressed as a  percentage
of  the outstanding principal  amount of such a  Series of Regular Certificates,
may increase over  time as  distributions in  reduction of  principal or  Stated
Amount  are made on the lower yielding Classes of Regular Certificates, whereas,
to the extent  the REMIC Pool  consists of fixed  rate Mortgage Loans,  interest
income with respect to any given Mortgage Loan will remain constant over time as
a  percentage of  the outstanding principal  amount of  that loan. Consequently,
Residual Holders must have sufficient other sources of cash to pay any  federal,
state,  or local income taxes  due as a result  of such mismatching or unrelated
deductions against which  to offset such  income, subject to  the discussion  of
"excess  inclusions" below under "-- Limitations on Offset or Exemption of REMIC
Income." The timing of  such mismatching of income  and deductions described  in
this  paragraph, if present with respect to a Series of Certificates, may have a
significant adverse effect upon a Residual Holder's after-tax rate of return. In
addition, a Residual Holder's taxable  income during certain periods may  exceed
the income reflected by such Residual Holder for such periods in accordance with
generally  accepted accounting  principles. Investors  should consult  their own
accountants concerning the accounting treatment of their investment in  Residual
Certificates.
 
    BASIS AND LOSSES
 
    The  amount of any net loss of the REMIC Pool that may be taken into account
by the  Residual  Holder  is limited  to  the  adjusted basis  of  the  Residual
Certificate  as  of the  close of  the quarter  (or time  of disposition  of the
Residual Certificate if earlier), determined without taking into account the net
loss for the quarter. The  initial adjusted basis of  a purchaser of a  Residual
Certificate  is the  amount paid  for such  Residual Certificate.  Such adjusted
basis will  be increased  by the  amount of  taxable income  of the  REMIC  Pool
reportable  by the Residual Holder  and will be decreased  (but not below zero),
first, by a cash distribution from the REMIC Pool and, second, by the amount  of
loss  of the  REMIC Pool  reportable by  the Residual  Holder. Any  loss that is
disallowed on account of this limitation  may be carried over indefinitely  with
respect  to the Residual Holder  as to whom such loss  was disallowed and may be
used by such Residual  Holder only to  offset any income  generated by the  same
REMIC Pool.
 
    A Residual Holder will not be permitted to amortize directly the cost of its
Residual  Certificate as  an offset to  its share  of the taxable  income of the
related REMIC Pool. However, that taxable income will not include cash  received
by  the REMIC Pool that  represents a recovery of the  REMIC Pool's basis in its
assets. Such  recovery of  basis  by the  REMIC Pool  will  have the  effect  of
amortization  of the issue  price of the Residual  Certificates over their life.
However, in view of the possible acceleration of the income of Residual  Holders
described  above under "Taxation of REMIC Income," the period of time over which
such issue price is effectively amortized  may be longer than the economic  life
of the Residual Certificates.
 
    A Residual Certificate may have a negative value if the net present value of
anticipated tax liabilities exceeds the present value of anticipated cash flows.
The  REMIC  Regulations appear  to  treat the  issue  price of  such  a residual
interest as zero rather  than such negative amount  for purposes of  determining
the  REMIC Pool's  basis in  its assets. The  preamble to  the REMIC Regulations
states that the  Internal Revenue  Service may  provide future  guidance on  the
proper  tax  treatment of  payments  made by  a  transferor of  such  a residual
interest to induce the transferee to acquire the interest, and Residual  Holders
should consult their own tax advisors in this regard.
 
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<PAGE>
    Further,  to the extent that the initial adjusted basis of a Residual Holder
(other than an original holder) in the Residual Certificate is greater than  the
corresponding  portion  of the  REMIC Pool's  basis in  the Mortgage  Loans, the
Residual Holder will not  recover a portion of  such basis until termination  of
the   REMIC  Pool  unless  future  Treasury  regulations  provide  for  periodic
adjustments to the REMIC income otherwise  reportable by such holder. The  REMIC
Regulations  currently in effect do not so provide. See "-- Treatment of Certain
Items of REMIC Income and Expense -- Market Discount" below regarding the  basis
of  Mortgage  Loans  to the  REMIC  Pool and  "Sale  or Exchange  of  a Residual
Certificate" below regarding possible  treatment of a  loss upon termination  of
the REMIC Pool as a capital loss.
 
    TREATMENT OF CERTAIN ITEMS OF REMIC INCOME AND EXPENSE
 
    Although  the  Seller  intends  to  compute  REMIC  income  and  expense  in
accordance with the Code and  applicable regulations, the authorities  regarding
the  determination  of  specific items  of  income  and expense  are  subject to
differing interpretations. The Seller makes no representation as to the specific
method that it will use for reporting income with respect to the Mortgage  Loans
and  expenses with  respect to  the Regular  Certificates and  different methods
could result in different timing of reporting  of taxable income or net loss  to
Residual Holders or differences in capital gain versus ordinary income.
 
    ORIGINAL ISSUE DISCOUNT AND PREMIUM.  Generally, the REMIC Pool's deductions
for  original issue discount and income  from amortization of issue premium will
be determined in the  same manner as original  issue discount income on  Regular
Certificates  as  described above  under  "Taxation of  Regular  Certificates --
Original Issue Discount"  and "-- Variable  Rate Regular Certificates,"  without
regard to the DE MINIMIS rule described therein, and "-- Premium."
 
    MARKET DISCOUNT.  The REMIC Pool will have market discount income in respect
of  Mortgage Loans if, in general, the basis  of the REMIC Pool in such Mortgage
Loans is exceeded by their unpaid principal balances. The REMIC Pool's basis  in
such  Mortgage Loans is  generally the fair  market value of  the Mortgage Loans
immediately after the transfer thereof to the REMIC Pool. The REMIC  Regulations
provide  that such basis  is equal in the  aggregate to the  issue prices of all
regular and residual interests  in the REMIC Pool.  The accrued portion of  such
market discount would be recognized currently as an item of ordinary income in a
manner  similar  to original  issue discount.  Market discount  income generally
should  accrue  in  the  manner  described  above  under  "Taxation  of  Regular
Certificates -- Market Discount."
 
    PREMIUM.   Generally, if the  basis of the REMIC  Pool in the Mortgage Loans
exceeds the unpaid principal balances thereof, the REMIC Pool will be considered
to have acquired such Mortgage  Loans at a premium equal  to the amount of  such
excess.  As stated above, the  REMIC Pool's basis in  Mortgage Loans is the fair
market value of the Mortgage Loans, based  on the aggregate of the issue  prices
of  the regular and residual  interests in the REMIC  Pool immediately after the
transfer thereof to  the REMIC  Pool. In a  manner analogous  to the  discussion
above under "Taxation of Regular Certificates -- Premium," a person that holds a
Mortgage  Loan as a capital  asset under Code Section  1221 may elect under Code
Section 171 to amortize premium on Mortgage Loans originated after September 27,
1985 under the constant yield method.  Amortizable bond premium will be  treated
as an offset to interest income on the Mortgage Loans, rather than as a separate
deduction  item. Because  substantially all  of the  mortgagors on  the Mortgage
Loans are expected to be individuals, Code Section 171 will not be available for
premium on Mortgage Loans originated on or prior to September 27, 1985.  Premium
with  respect to  such Mortgage  Loans may  be deductible  in accordance  with a
reasonable method regularly employed  by the holder  thereof. The allocation  of
such premium pro rata among principal payments should be considered a reasonable
method; however, the Internal Revenue Service may argue that such premium should
be  allocated in a different manner, such as allocating such premium entirely to
the final payment of principal.
 
                                       78
<PAGE>
    LIMITATIONS ON OFFSET OR EXEMPTION OF REMIC INCOME
 
    A portion (or all) of the REMIC taxable income includible in determining the
federal income tax  liability of a  Residual Holder will  be subject to  special
treatment.  That portion, referred to as the "excess inclusion," is equal to the
excess of REMIC taxable income for the calendar quarter allocable to a  Residual
Certificate over the daily accruals for such quarterly period of (i) 120% of the
long-term  applicable  Federal  rate that  would  have applied  to  the Residual
Certificate (if it were a debt instrument) on the Startup Day under Code Section
1274(d),  multiplied  by  (ii)  the  adjusted  issue  price  of  such   Residual
Certificate  at the  beginning of such  quarterly period. For  this purpose, the
adjusted issue price of a Residual Certificate at the beginning of a quarter  is
the  issue price  of the  Residual Certificate,  plus the  amount of  such daily
accruals of REMIC  income described in  this paragraph for  all prior  quarters,
decreased  by any distributions  made with respect  to such Residual Certificate
prior to the beginning of such quarterly period. Accordingly, the portion of the
REMIC Pool's taxable income that will be treated as excess inclusions will be  a
larger  portion  of such  income as  the  adjusted issue  price of  the Residual
Certificates diminishes.
 
    The portion of a  Residual Holder's REMIC taxable  income consisting of  the
excess inclusions generally may not be offset by other deductions, including net
operating  loss carryforwards,  on such  Residual Holder's  return. However, net
operating loss  carryovers are  determined without  regard to  excess  inclusion
income. Further, if the Residual Holder is an organization subject to the tax on
unrelated  business income  imposed by Code  Section 511,  the Residual Holder's
excess inclusions will be treated as  unrelated business taxable income of  such
Residual  Holder for  purposes of Code  Section 511. In  addition, REMIC taxable
income is subject to 30% withholding tax with respect to certain persons who are
not U.S. Persons (as defined  below under "Tax-Related Restrictions on  Transfer
of  Residual  Certificates  --  Foreign  Investors"),  and  the  portion thereof
attributable to excess inclusions is not eligible for any reduction in the  rate
of  withholding tax (by  treaty or otherwise). See  "Taxation of Certain Foreign
Investors -- Residual Certificates" below. Finally, if a real estate  investment
trust  or a regulated investment company  owns a Residual Certificate, a portion
(allocated under Treasury regulations yet to be issued) of dividends paid by the
real estate investment trust or regulated investment company could not be offset
by net operating losses of its shareholders, would constitute unrelated business
taxable  income  for  tax-exempt  shareholders,  and  would  be  ineligible  for
reduction  of withholding to certain persons who are not U.S. Persons. The SBJPA
of 1996  has eliminated  the special  rule permitting  Section 593  institutions
("thrift  institutions")  to  use  net  operating  losses  and  other  allowable
deductions to offset  their excess inclusion  income from Residual  Certificates
that  have  "significant value"  within the  meaning  of the  REMIC Regulations,
effective for  taxable years  beginning  after December  31, 1995,  except  with
respect to Residual Certificates continuously held by a thrift institution since
November 1, 1995.
 
    In  addition, the  SBJPA of  1996 provides  three rules  for determining the
effect of  excess inclusions  on the  alternative minimum  taxable income  of  a
Residual Holder. First, alternative minimum taxable income for a Residual Holder
is  determined without regard to the special rule, discussed above, that taxable
income cannot  be  less than  excess  inclusions. Second,  a  Residual  Holder's
alternative  minimum taxable income for  a taxable year cannot  be less than the
excess inclusions for the year. Third, the amount of any alternative minimum tax
net operating  loss deduction  must be  computed without  regard to  any  excess
inclusions. These rules are effective for taxable years beginning after December
31,  1986, unless  a Residual  Holder elects  to have  such rules  apply only to
taxable years beginning after August 20, 1996.
 
    TAX-RELATED RESTRICTIONS ON TRANSFER OF RESIDUAL CERTIFICATES
 
    DISQUALIFIED ORGANIZATIONS.    If any  legal  or beneficial  interest  in  a
Residual  Certificate is transferred to  a Disqualified Organization (as defined
below), a tax  would be imposed  in an amount  equal to the  product of (i)  the
present  value of the  total anticipated excess inclusions  with respect to such
Residual Certificate  for  periods  after  the transfer  and  (ii)  the  highest
marginal   federal  income  tax  rate  applicable  to  corporations.  The  REMIC
Regulations provide that the anticipated  excess inclusions are based on  actual
prepayment  experience to the date of  the transfer and projected payments based
on
 
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<PAGE>
the Prepayment Assumption. The present value rate equals the applicable  Federal
rate under Code Section 1274(d) as of the date of the transfer for a term ending
with  the  last calendar  quarter  in which  excess  inclusions are  expected to
accrue. Such rate is applied to  the anticipated excess inclusions from the  end
of  the  remaining calendar  quarters in  which they  arise to  the date  of the
transfer. Such  a  tax generally  would  be imposed  on  the transferor  of  the
Residual  Certificate,  except  that where  such  transfer is  through  an agent
(including  a  broker,   nominee,  or  other   middleman)  for  a   Disqualified
Organization,  the  tax  would instead  be  imposed  on such  agent.  However, a
transferor of a Residual Certificate  would in no event  be liable for such  tax
with  respect to  a transfer  if the transferee  furnishes to  the transferor an
affidavit stating that the transferee is not a Disqualified Organization and, as
of the time of the transfer, the transferor does not have actual knowledge  that
such  affidavit is  false. The tax  also may  be waived by  the Internal Revenue
Service if  the  Disqualified Organization  promptly  disposes of  the  Residual
Certificate  and the transferor pays income tax at the highest corporate rate on
the excess inclusion for the period the Residual Certificate is actually held by
the Disqualified Organization.
 
    In addition,  if  a "Pass-Through  Entity"  (as defined  below)  has  excess
inclusion  income with respect  to a Residual Certificate  during a taxable year
and a Disqualified Organization  is the record holder  of an equity interest  in
such  entity, then a tax is  imposed on such entity equal  to the product of (i)
the amount  of excess  inclusions that  are  allocable to  the interest  in  the
Pass-Through Entity during the period such interest is held by such Disqualified
Organization,  and (ii) the highest marginal  federal corporate income tax rate.
Such tax would be deductible from the ordinary gross income of the  Pass-Through
Entity  for the taxable  year. The Pass-Through  Entity would not  be liable for
such tax if it has received an affidavit from such record holder that it is  not
a  Disqualified Organization  or stating  such holder's  taxpayer identification
number and, during the period such person  is the record holder of the  Residual
Certificate,  the Pass-Through Entity  does not have  actual knowledge that such
affidavit is false.
 
    For these purposes, (i) "Disqualified Organization" means the United States,
any  state  or  political  subdivision  thereof,  any  foreign  government,  any
international  organization,  any  agency  or  instrumentality  of  any  of  the
foregoing (provided, that such term does  not include an instrumentality if  all
of its activities are subject to tax and a majority of its board of directors is
not  selected  by any  such governmental  entity), any  cooperative organization
furnishing electric energy or  providing telephone service  to persons in  rural
areas  as described in  Code Section 1381(a)(2)(C),  and any organization (other
than a farmers' cooperative described in  Code Section 521) that is exempt  from
taxation  under  the Code  unless such  organization  is subject  to the  tax on
unrelated business income imposed  by Code Section  511, and (ii)  "Pass-Through
Entity"  means any regulated  investment company, real  estate investment trust,
common trust  fund,  partnership,  trust  or  estate  and  certain  corporations
operating  on  a  cooperative  basis.  Except as  may  be  provided  in Treasury
regulations, any  person holding  an  interest in  a  Pass-Through Entity  as  a
nominee  for  another will,  with  respect to  such  interest, be  treated  as a
Pass-Through Entity.
 
    The Pooling and Servicing  Agreement with respect to  a Series will  provide
that  no  legal  or  beneficial  interest  in  a  Residual  Certificate  may  be
transferred or registered unless  (i) the proposed  transferee furnishes to  the
Seller and the Trustee an affidavit providing its taxpayer identification number
and  stating  that  such transferee  is  the  beneficial owner  of  the Residual
Certificate and is not  a Disqualified Organization and  is not purchasing  such
Residual  Certificate  on  behalf of  a  Disqualified Organization  (I.E.,  as a
broker, nominee  or  middleman  thereof)  and (ii)  the  transferor  provides  a
statement  in  writing to  the  Seller and  the Trustee  that  it has  no actual
knowledge that  such affidavit  is false.  Moreover, the  Pooling and  Servicing
Agreement  will provide that any attempted or purported transfer in violation of
these transfer restrictions will be null and void and will vest no rights in any
purported transferee. Each Residual  Certificate with respect  to a Series  will
bear  a legend  referring to  such restrictions  on transfer,  and each Residual
Holder will be deemed to  have agreed, as a  condition of ownership thereof,  to
any   amendments  to  the  related  Pooling  and  Servicing  Agreement  required
 
                                       80
<PAGE>
under the Code or  applicable Treasury regulations  to effectuate the  foregoing
restrictions.  Information necessary to compute an applicable excise tax must be
furnished to the Internal Revenue Service and to the requesting party within  60
days  of  the request,  and  the Seller  or  the Trustee  may  charge a  fee for
computing and providing such information.
 
    NONECONOMIC RESIDUAL  INTERESTS.    The REMIC  Regulations  would  disregard
certain  transfers of Residual Certificates, in  which case the transferor would
continue to be treated as the owner of the Residual Certificates and thus  would
continue  to be subject to tax on its allocable portion of the net income of the
REMIC Pool. Under the REMIC Regulations,  a transfer of a "noneconomic  residual
interest"  (as defined below) to a Residual Holder (other than a Residual Holder
who is  not  a U.S.  Person,  as defined  below  under "Foreign  Investors")  is
disregarded  for all federal income tax purposes if a significant purpose of the
transferor is to impede the assessment or collection of tax. A residual interest
in a REMIC (including a residual interest with a positive value at issuance)  is
a  "noneconomic residual interest" unless, at the  time of the transfer, (i) the
present value of the expected future  distributions on the residual interest  at
least  equals  the  product  of  the present  value  of  the  anticipated excess
inclusions and the highest corporate income tax  rate in effect for the year  in
which  the transfer occurs, and (ii)  the transferor reasonably expects that the
transferee will receive  distributions from the  REMIC at or  after the time  at
which  taxes accrue on the anticipated excess inclusions in an amount sufficient
to satisfy the accrued  taxes on each excess  inclusion. The anticipated  excess
inclusions  and the present value rate are  determined in the same manner as set
forth above under  "Disqualified Organizations." The  REMIC Regulations  explain
that  a significant purpose to impede the assessment or collection of tax exists
if the transferor, at the time of the transfer, either knew or should have known
that the transferee would be unwilling or  unable to pay taxes due on its  share
of  the  taxable income  of the  REMIC. A  safe  harbor is  provided if  (i) the
transferor conducted, at the time of the transfer, a reasonable investigation of
the financial  condition  of  the  transferee  and  found  that  the  transferee
historically  had  paid its  debts as  they  came due  and found  no significant
evidence to indicate that the transferee would not continue to pay its debts  as
they  came  due  in  the  future, and  (ii)  the  transferee  represents  to the
transferor that it understands that, as the holder of the non-economic  residual
interest,  the transferee may incur tax liabilities  in excess of any cash flows
generated by  the  interest  and  that  the  transferee  intends  to  pay  taxes
associated  with holding the  residual interest as they  become due. The Pooling
and Servicing Agreement with respect to each Series of Certificates will require
the transferee  of a  Residual Certificate  to  certify to  the matters  in  the
preceding  sentence as part  of the affidavit described  above under the heading
"Disqualified Organizations."
 
    FOREIGN INVESTORS.   The REMIC Regulations  provide that the  transfer of  a
Residual  Certificate that has  "tax avoidance potential"  to a "foreign person"
will be disregarded for all federal tax purposes. This rule appears intended  to
apply to a transferee who is not a "U.S. Person" (as defined below), unless such
transferee's  income is  effectively connected  with the  conduct of  a trade or
business within the United States. A Residual Certificate is deemed to have  tax
avoidance potential unless, at the time of the transfer, (i) the future value of
expected  distributions equals at least 30% of the anticipated excess inclusions
after the  transfer,  and  (ii)  the  transferor  reasonably  expects  that  the
transferee will receive sufficient distributions from the REMIC Pool at or after
the  time at which the excess inclusions accrue and prior to the end of the next
succeeding taxable  year for  the accumulated  withholding tax  liability to  be
paid.  If the non-U.S. Person transfers the  Residual Certificate back to a U.S.
Person, the  transfer  will  be  disregarded and  the  foreign  transferor  will
continue  to be treated  as the owner  unless arrangements are  made so that the
transfer does not have  the effect of  allowing the transferor  to avoid tax  on
accrued excess inclusions.
 
    The  Prospectus  Supplement relating  to the  Certificates  of a  Series may
provide that a Residual  Certificate may not be  purchased by or transferred  to
any  person that  is not  a U.S.  Person or  may describe  the circumstances and
restrictions pursuant  to which  such a  transfer may  be made.  The term  "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
 
                                       81
<PAGE>
thereof,  an estate that is subject to U.S. federal income tax regardless of the
source of  its income,  or a  trust if  (A) for  taxable years  beginning  after
December  31,  1996  (or after  August  20, 1996,  if  the trustee  has  made an
applicable election),  a court  within the  United States  is able  to  exercise
primary  supervision  over the  administration of  such trust,  and one  or more
United  States  fiduciaries  have  the  authority  to  control  all  substantial
decisions  of such  trust, or  (B) for  all other  taxable years,  such trust is
subject to U.S. federal income tax regardless of the source of its income.
 
    SALE OR EXCHANGE OF A RESIDUAL CERTIFICATE
 
    Upon the sale  or exchange of  a Residual Certificate,  the Residual  Holder
will  recognize gain or loss equal to the excess, if any, of the amount realized
over the  adjusted  basis  (as  described  above  under  "Taxation  of  Residual
Certificates  -- Basis  and Losses")  of such  Residual Holder  in such Residual
Certificate at the time of  the sale or exchange.  In addition to reporting  the
taxable  income of the REMIC Pool, a Residual Holder will have taxable income to
the extent that any  cash distribution to  it from the  REMIC Pool exceeds  such
adjusted  basis on that Distribution  Date. Such income will  be treated as gain
from the sale or exchange of the  Residual Certificate. It is possible that  the
termination of the REMIC Pool may be treated as a sale or exchange of a Residual
Holder's  Residual Certificate,  in which  case, if  the Residual  Holder has an
adjusted basis in its  Residual Certificate remaining when  its interest in  the
REMIC  Pool terminates, and if  it holds such Residual  Certificate as a capital
asset under Code Section  1221, then it  will recognize a  capital loss at  that
time in the amount of such remaining adjusted basis.
 
    Any  gain on the sale of a  Residual Certificate will be treated as ordinary
income (i)  if  a  Residual  Certificate  is  held  as  part  of  a  "conversion
transaction"  as defined in Code  Section 1258(c), up to  the amount of interest
that would have accrued  on the Residual  Certificateholder's net investment  in
the conversion transaction at 120% of the appropriate applicable Federal rate in
effect  at the time the  taxpayer entered into the  transaction minus any amount
previously treated as ordinary income with  respect to any prior disposition  of
property  that was held as a  part of such transaction or  (ii) in the case of a
non-corporate taxpayer, to the extent such  taxpayer has made an election  under
Code  Section 163(d)(4) to have net capital  gains taxed as investment income at
ordinary income rates. In addition, gain or  loss recognized from the sale of  a
Residual  Certificate by certain banks or thrift institutions will be treated as
ordinary income or loss pursuant to Code Section 582(c).
 
    The Conference Committee  Report to the  1986 Act provides  that, except  as
provided  in Treasury regulations yet to be  issued, the wash sale rules of Code
Section 1091  will apply  to  dispositions of  Residual Certificates  where  the
seller  of  the Residual  Certificate, during  the  period beginning  six months
before the sale or disposition of the Residual Certificate and ending six months
after such sale or disposition, acquires  (or enters into any other  transaction
that  results in the application of Code  Section 1091) any residual interest in
any REMIC or  any interest in  a "taxable  mortgage pool" (such  as a  non-REMIC
owner trust) that is economically comparable to a Residual Certificate.
 
    MARK TO MARKET REGULATIONS
 
    Prospective  purchasers of the Residual Certificates should be aware that on
January 3, 1995, the Internal Revenue Service released proposed regulations (the
"Proposed Mark to Market  Regulations") under Code Section  475 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  of  a
dealer,  except  to the  extent that  the dealer  has specifically  identified a
security as held for investment. The Proposed Mark to Market Regulations provide
that, for purposes of this mark-to-market requirement, a Residual Certificate is
not treated as a  security and thus  may not be marked  to market. The  Proposed
Mark  to Market  Regulations apply to  all Residual Certificates  acquired on or
after January 4, 1995.
 
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TAXES THAT MAY BE IMPOSED ON THE REMIC POOL
 
    PROHIBITED TRANSACTIONS
 
    Income from  certain  transactions  by the  REMIC  Pool,  called  prohibited
transactions,  will not be part of the  calculation of income or loss includible
in the federal income tax returns of Residual Holders, but rather will be  taxed
directly  to the  REMIC Pool at  a 100% rate.  Prohibited transactions generally
include (i)  the  disposition  of  a  qualified  mortgage  other  than  for  (a)
substitution  within two years of  the Startup Day for  a defective (including a
defaulted) obligation  (or repurchase  in lieu  of substitution  of a  defective
(including  a defaulted) obligation  at any time) or  for any qualified mortgage
within three months of  the Startup Day, (b)  foreclosure, default, or  imminent
default of a qualified mortgage, (c) bankruptcy or insolvency of the REMIC Pool,
or  (d)  a qualified  (complete) liquidation,  (ii) the  receipt of  income from
assets that are not the type of mortgages or investments that the REMIC Pool  is
permitted  to hold, (iii) the receipt of  compensation for services, or (iv) the
receipt of gain from disposition of cash flow investments other than pursuant to
a qualified liquidation. Notwithstanding  (i) and (iv), it  is not a  prohibited
transaction  to  sell  REMIC  Pool  property to  prevent  a  default  on Regular
Certificates as a result of a default on qualified mortgages or to facilitate  a
clean-up  call (generally, an optional  termination to save administrative costs
when no more than  a small percentage of  the Certificates is outstanding).  The
REMIC  Regulations indicate that  the modification of  a Mortgage Loan generally
will not  be treated  as a  disposition  if it  is occasioned  by a  default  or
reasonably  foreseeable default, an assumption of  the Mortgage Loan, the waiver
of a due-on-sale or due-on-encumbrance clause, or the conversion of an  interest
rate  by a  mortgagor pursuant  to the  terms of  a convertible  adjustable rate
Mortgage Loan.
 
    CONTRIBUTIONS TO THE REMIC POOL AFTER THE STARTUP DAY
 
    In general, the REMIC Pool will  be subject to a tax  at a 100% rate on  the
value  of any  property contributed  to the  REMIC Pool  after the  Startup Day.
Exceptions are provided for cash contributions to the REMIC Pool (i) during  the
three months following the Startup Day, (ii) made to a qualified reserve fund by
a Residual Holder, (iii) in the nature of a guarantee, (iv) made to facilitate a
qualified  liquidation  or  clean-up call,  and  (v) as  otherwise  permitted in
Treasury regulations yet to be issued. It is not anticipated that there will  be
any contributions to the REMIC Pool after the Startup Day.
 
    NET INCOME FROM FORECLOSURE PROPERTY
 
    The  REMIC  Pool  will be  subject  to  federal income  tax  at  the highest
corporate  rate  on  "net  income  from  foreclosure  property,"  determined  by
reference  to the rules applicable to  real estate investment trusts. Generally,
property  acquired  by  deed  in  lieu  of  foreclosure  would  be  treated   as
"foreclosure  property" for a period of two years, with possible extensions. Net
income from  foreclosure  property generally  means  gain  from the  sale  of  a
foreclosure   property  that  is  inventory   property  and  gross  income  from
foreclosure property other than qualifying rents and other qualifying income for
a real estate investment trust. It is  not anticipated that the REMIC Pool  will
have any taxable net income from foreclosure property.
 
LIQUIDATION OF THE REMIC POOL
 
    If a REMIC Pool adopts a plan of complete liquidation, within the meaning of
Code  Section 860F(a)(4)(A)(i), which may be  accomplished by designating in the
REMIC Pool's final tax return a date on which such adoption is deemed to  occur,
and  sells all of its assets (other  than cash) within a 90-day period beginning
on such date, the REMIC Pool will  not be subject to the prohibited  transaction
rules  on  the sale  of  its assets,  provided that  the  REMIC Pool  credits or
distributes in liquidation all  of the sale proceeds  plus its cash (other  than
amounts retained to meet claims) to holders of Regular Certificates and Residual
Holders within the 90-day period.
 
ADMINISTRATIVE MATTERS
 
    The  REMIC Pool will  be required to  maintain its books  on a calendar year
basis and to file federal income tax returns for federal income tax purposes  in
a  manner similar to a partnership. The form  for such income tax return is Form
1066,   U.S.   Real    Estate   Mortgage   Investment    Conduit   Income    Tax
 
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<PAGE>
Return.  The Trustee will be required to sign the REMIC Pool's returns. Treasury
regulations provide that, except where there is a single Residual Holder for  an
entire  taxable  year, the  REMIC Pool  will  be subject  to the  procedural and
administrative rules  of  the Code  applicable  to partnerships,  including  the
determination by the Internal Revenue Service of any adjustments to, among other
things,  items of REMIC  income, gain, loss,  deduction, or credit  in a unified
administrative proceeding. The Master Servicer will be obligated to act as  "tax
matters  person," as defined in applicable Treasury regulations, with respect to
the REMIC  Pool, in  its capacity  as either  Residual Holder  or agent  of  the
Residual  Holders. If the Code or  applicable Treasury regulations do not permit
the Master Servicer to act as tax matters person in its capacity as agent of the
Residual Holders, the  Residual Holder chosen  by the Residual  Holders or  such
other  person specified pursuant to Treasury regulations will be required to act
as tax matters person.
 
LIMITATIONS ON DEDUCTION OF CERTAIN EXPENSES
 
    An investor  who is  an individual,  estate,  or trust  will be  subject  to
limitation with respect to certain itemized deductions described in Code Section
67, to the extent that such itemized deductions, in the aggregate, do not exceed
2%  of  the  investor's adjusted  gross  income.  In addition,  Code  Section 68
provides that itemized deductions otherwise allowable  for a taxable year of  an
individual  taxpayer will be reduced  by the lesser of (i)  3% of the excess, if
any, of adjusted gross income  over $100,000 ($50,000 in  the case of a  married
individual  filing a separate return) (subject  to adjustment for inflation), or
(ii) 80% of the amount of itemized deductions otherwise allowable for such year.
In the case of a REMIC Pool,  such deductions may include deductions under  Code
Section  212 for  the Servicing  Fee and  all administrative  and other expenses
relating to the REMIC Pool, or any similar expenses allocated to the REMIC  Pool
with respect to a regular interest it holds in another REMIC. Such investors who
hold  REMIC  Certificates either  directly or  indirectly through  certain pass-
through entities may  have their pro  rata share of  such expenses allocated  to
them  as  additional gross  income, but  may  be subject  to such  limitation on
deductions. In addition, such expenses are not deductible at all for purposes of
computing the  alternative minimum  tax,  and may  cause  such investors  to  be
subject  to significant additional tax liability. Temporary Treasury regulations
provide that the additional  gross income and  corresponding amount of  expenses
generally  are to be allocated entirely  to the holders of Residual Certificates
in the case of a REMIC Pool that  would not qualify as a fixed investment  trust
in  the absence of a  REMIC election. However, such  additional gross income and
limitation on deductions will apply to the allocable portion of such expenses to
holders of Regular Certificates,  as well as  holders of Residual  Certificates,
where  such  Regular Certificates  are issued  in  a manner  that is  similar to
pass-through  certificates  in  a  fixed  investment  trust.  Unless   indicated
otherwise  in the  applicable Prospectus Supplement,  all such  expenses will be
allocable to the Residual Certificates. In general, such allocable portion  will
be  determined  based  on the  ratio  that a  REMIC  Certificateholder's income,
determined on a  daily basis,  bears to  the income  of all  holders of  Regular
Certificates  and  Residual Certificates  with  respect to  a  REMIC Pool.  As a
result, individuals,  estates  or  trusts  holding  REMIC  Certificates  (either
directly  or  indirectly through  a grantor  trust, partnership,  S corporation,
REMIC, or  certain  other  pass-through  entities  described  in  the  foregoing
temporary  Treasury  regulations)  may  have taxable  income  in  excess  of the
interest income at the pass-through rate on Regular Certificates that are issued
in a single class or otherwise  consistently with fixed investment trust  status
or  in  excess  of  cash  distributions  for  the  related  period  on  Residual
Certificates.
 
TAXATION OF CERTAIN FOREIGN INVESTORS
 
    REGULAR CERTIFICATES
 
    Interest,  including  original  issue  discount,  distributable  to  Regular
Certificateholders  who are non-resident aliens,  foreign corporations, or other
Non-U.S. Persons (as  defined below),  will be  considered "portfolio  interest"
and,  therefore, generally will not be  subject to 30% United States withholding
tax, provided that such  Non-U.S. Person (i) is  not a "10-percent  shareholder"
within  the  meaning  of  Code  Section  871(h)(3)(B)  or  a  controlled foreign
corporation described  in  Code  Section  881(c)(3)(C)  and  (ii)  provides  the
Trustee,    or    the   person    who   would    otherwise   be    required   to
 
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withhold tax from such  distributions under Code Section  1441 or 1442, with  an
appropriate  statement,  signed  under  penalties  of  perjury,  identifying the
beneficial owner and stating, among other  things, that the beneficial owner  of
the  Regular Certificate is a  Non-U.S. Person. If such  statement, or any other
required statement, is not provided,  30% withholding will apply unless  reduced
or eliminated pursuant to an applicable tax treaty or unless the interest on the
Regular  Certificate is  effectively connected  with the  conduct of  a trade or
business within the United States by  such Non-U.S. Person. In the latter  case,
such  Non-U.S. Person  will be  subject to United  States federal  income tax at
regular rates. Investors who are Non-U.S.  Persons should consult their own  tax
advisors  regarding the  specific tax consequences  to them of  owning a Regular
Certificate. The  term "Non-U.S.  Person" means  any person  who is  not a  U.S.
Person.
 
    RESIDUAL CERTIFICATES
 
    The  Conference Committee Report to the 1986 Act indicates that amounts paid
to Residual Holders  who are  Non-U.S. Persons  generally should  be treated  as
interest  for  purposes  of  the  30%  (or  lower  treaty  rate)  United  States
withholding tax.  Treasury  regulations  provide  that  amounts  distributed  to
Residual  Holders may qualify as "portfolio interest," subject to the conditions
described in "Regular Certificates" above, but  only to the extent that (i)  the
Mortgage  Loans were  issued after July  18, 1984  and (ii) the  Trust Estate or
segregated pool of assets therein (as to which a separate REMIC election will be
made), to which the Residual Certificate relates, consists of obligations issued
in "registered form" within  the meaning of  Code Section 163(f)(1).  Generally,
Mortgage Loans will not be, but regular interests in another REMIC Pool will be,
considered obligations issued in registered form. Furthermore, a Residual Holder
will  not be entitled  to any exemption  from the 30%  withholding tax (or lower
treaty rate)  to  the  extent of  that  portion  of REMIC  taxable  income  that
constitutes  an "excess  inclusion." See  "Taxation of  Residual Certificates --
Limitations on Offset  or Exemption  of REMIC Income."  If the  amounts paid  to
Residual  Holders who  are Non-U.S. Persons  are effectively  connected with the
conduct of  a  trade or  business  within the  United  States by  such  Non-U.S.
Persons,  30% (or  lower treaty rate)  withholding will not  apply. Instead, the
amounts paid to such Non-U.S. Persons  will be subject to United States  federal
income  tax  at regular  rates. If  30%  (or lower  treaty rate)  withholding is
applicable, such amounts generally  will be taken into  account for purposes  of
withholding  only  when  paid or  otherwise  distributed (or  when  the Residual
Certificate is disposed of) under rules similar to withholding upon  disposition
of  debt  instruments  that  have  original  issue  discount.  See  "Tax-Related
Restrictions on Transfer  of Residual Certificates  -- Foreign Investors"  above
concerning  the disregard of certain transfers having "tax avoidance potential."
Investors who  are  Non-U.S.  Persons  should consult  their  own  tax  advisors
regarding the specific tax consequences to them of owning Residual Certificates.
 
BACKUP WITHHOLDING
 
    Distributions  made on the Regular Certificates,  and proceeds from the sale
of the Regular Certificates to or through  certain brokers, may be subject to  a
"backup" withholding tax under Code Section 3406 of 31% on "reportable payments"
(including  interest distributions, original issue  discount, and, under certain
circumstances, principal  distributions)  unless the  Regular  Certificateholder
complies  with certain reporting and/or  certification procedures, including the
provision of its taxpayer identification number to the Trustee, its agent or the
broker  who   effected  the   sale   of  the   Regular  Certificate,   or   such
Certificateholder  is otherwise an exempt  recipient under applicable provisions
of the  Code.  Any amounts  to  be withheld  from  distribution on  the  Regular
Certificates  would be refunded by the Internal  Revenue Service or allowed as a
credit against the Regular Certificateholder's federal income tax liability.
 
REPORTING REQUIREMENTS
 
    Reports  of  accrued  interest,  original  issue  discount  and  information
necessary to compute the accrual of market discount will be made annually to the
Internal   Revenue  Service   and  to   individuals,  estates,   non-exempt  and
non-charitable trusts,  and partnerships  who are  either holders  of record  of
Regular Certificates or beneficial owners who own Regular Certificates through a
broker  or middleman as nominee. All  brokers, nominees and all other non-exempt
holders of record of Regular
 
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Certificates (including corporations, non-calendar year taxpayers, securities or
commodities dealers, real estate investment trusts, investment companies, common
trust funds,  thrift  institutions  and  charitable  trusts)  may  request  such
information  for any calendar  quarter by telephone or  in writing by contacting
the person designated in Internal  Revenue Service Publication 938 with  respect
to  a particular Series  of Regular Certificates.  Holders through nominees must
request such information from the nominee.
 
    The Internal Revenue  Service's Form  1066 has an  accompanying Schedule  Q,
Quarterly  Notice to  Residual Interest Holders  of REMIC Taxable  Income or Net
Loss Allocation. Treasury regulations  require that Schedule  Q be furnished  by
the  REMIC Pool to  each Residual Holder by  the end of  the month following the
close of  each calendar  quarter  (41 days  after the  end  of a  quarter  under
proposed Treasury regulations) in which the REMIC Pool is in existence.
 
    Treasury   regulations   require  that,   in   addition  to   the  foregoing
requirements, information  must  be  furnished quarterly  to  Residual  Holders,
furnished annually, if applicable, to holders of Regular Certificates, and filed
annually  with the Internal Revenue Service  concerning Code Section 67 expenses
(see "Limitations on  Deduction of  Certain Expenses" above)  allocable to  such
holders.  Furthermore,  under such  regulations,  information must  be furnished
quarterly  to  Residual  Holders,  furnished  annually  to  holders  of  Regular
Certificates,  and filed annually  with the Internal  Revenue Service concerning
the percentage of  the REMIC  Pool's assets  meeting the  qualified asset  tests
described above under "Status of REMIC Certificates."
 
FEDERAL INCOME TAX CONSEQUENCES FOR CERTIFICATES AS TO WHICH NO REMIC ELECTION
IS MADE
 
    GENERAL
 
    In  the  event that  no  election is  made  to treat  a  Trust Estate  (or a
segregated pool of assets therein) with respect to a Series of Certificates as a
REMIC, the Trust Estate will be classified  as a grantor trust under subpart  E,
Part  1 of  subchapter J  of the  Code and  not as  an association  taxable as a
corporation or a  "taxable mortgage  pool" within  the meaning  of Code  Section
7701(i).  Where there is  no Fixed Retained  Yield with respect  to the Mortgage
Loans underlying the Certificates of a  Series, and where such Certificates  are
not  designated as "Stripped Certificates," the  holder of each such Certificate
in such Series will be treated as the owner of a pro rata undivided interest  in
the  ordinary income and corpus portions of  the Trust Estate represented by its
Certificate and will be considered the beneficial owner of a pro rata  undivided
interest  in each of the  Mortgage Loans, subject to  the discussion below under
"Recharacterization of Servicing Fees." Accordingly, the holder of a Certificate
of a particular  Series will be  required to  report on its  federal income  tax
return  its  pro  rata  share  of the  entire  income  from  the  Mortgage Loans
represented by its Certificate,  including interest at the  coupon rate on  such
Mortgage  Loans, original issue  discount (if any),  prepayment fees, assumption
fees, and late payment charges received by the Servicer, in accordance with such
Certificateholder's method of accounting. A Certificateholder generally will  be
able  to deduct its share of the  Servicing Fee and all administrative and other
expenses of  the Trust  Estate  in accordance  with  its method  of  accounting,
provided  that such amounts are reasonable compensation for services rendered to
that Trust Estate. However, investors who are individuals, estates or trusts who
own Certificates,  either directly  or indirectly  through certain  pass-through
entities,  will  be  subject  to limitation  with  respect  to  certain itemized
deductions described in Code Section 67, including deductions under Code Section
212 for the Servicing Fee and all such administrative and other expenses of  the
Trust  Estate, to  the extent  that such  deductions, in  the aggregate,  do not
exceed two percent  of an investor's  adjusted gross income.  In addition,  Code
Section  68 provides that itemized deductions  otherwise allowable for a taxable
year of an individual taxpayer  will be reduced by the  lesser of (i) 3% of  the
excess, if any, of adjusted gross income over $100,000 ($50,000 in the case of a
married  individual filing  a separate  return) (in  each case,  as adjusted for
inflation), or (ii) 80% of the amount of itemized deductions otherwise allowable
for such year.  As a result,  such investors holding  Certificates, directly  or
indirectly  through a pass-through entity, may  have aggregate taxable income in
excess of  the aggregate  amount  of cash  received  on such  Certificates  with
respect  to interest  at the  pass-through rate  or as  discount income  on such
Certificates. In addition, such expenses are not deductible at all for  purposes
of
 
                                       86
<PAGE>
computing  the  alternative minimum  tax,  and may  cause  such investors  to be
subject to significant additional tax liability. Moreover, where there is  Fixed
Retained  Yield  with  respect to  the  Mortgage  Loans underlying  a  Series of
Certificates or where the servicing fees  are in excess of reasonable  servicing
compensation,  the  transaction  will  be  subject  to  the  application  of the
"stripped bond" and  "stripped coupon"  rules of  the Code,  as described  below
under  "Stripped  Certificates"  and  "Recharacterization  of  Servicing  Fees,"
respectively.
 
    TAX STATUS
 
    Cadwalader, Wickersham  &  Taft  has  advised the  Seller  that,  except  as
described below with respect to Stripped Certificates:
 
       1.  A  Certificate owned  by a  "domestic building  and loan association"
           within the meaning of Code Section 7701(a)(19) will be considered  to
    represent  "loans...secured  by an  interest  in real  property"  within the
    meaning of Code Section 7701(a)(19)(C)(v),  provided that the real  property
    securing  the Mortgage Loans represented by  that Certificate is of the type
    described in such section of the Code.
 
       2.  A Certificate  owned  by  a  real estate  investment  trust  will  be
           considered  to represent "real  estate assets" within  the meaning of
    Code Section 856(c)(5)(A) to the extent that the assets of the related Trust
    Estate consist of qualified assets, and interest income on such assets  will
    be  considered  "interest  on  obligations  secured  by  mortgages  on  real
    property" to such extent within the meaning of Code Section 856(c)(3)(B).
 
       3.  A Certificate owned  by a REMIC  will be considered  to represent  an
           "obligation (including any participation or certificate of beneficial
    ownership  therein)  which is  principally secured  by  an interest  in real
    property" within the  meaning of  Code Section 860G(a)(3)(A)  to the  extent
    that the assets of the related Trust Estate consist of "qualified mortgages"
    within the meaning of Code Section 860G(a)(3).
 
    An  issue arises as to whether Buy-Down  Loans may be characterized in their
entirety under the Code provisions cited in  clauses 1 and 2 of the  immediately
preceding  paragraph.  There is  indirect authority  supporting treatment  of an
investment in a Buy-Down Loan as entirely  secured by real property if the  fair
market value of the real property securing the loan exceeds the principal amount
of the loan at the time of issuance or acquisition, as the case may be. There is
no  assurance  that  the  treatment  described  above  is  proper.  Accordingly,
Certificateholders are urged to  consult their own  tax advisors concerning  the
effects of such arrangements on the characterization of such Certificateholder's
investment for federal income tax purposes.
 
    PREMIUM AND DISCOUNT
 
    Certificateholders  are advised to consult with their tax advisors as to the
federal income tax treatment of premium and discount arising either upon initial
acquisition of Certificates or thereafter.
 
    PREMIUM.   The  treatment  of  premium  incurred  upon  the  purchase  of  a
Certificate  will  be determined  generally  as described  above  under "Federal
Income  Tax  Consequences  for  REMIC  Certificates  --  Taxation  of   Residual
Certificates -- Premium."
 
    ORIGINAL ISSUE DISCOUNT.  The original issue discount rules of Code Sections
1271  through 1275 will be applicable to a Certificateholder's interest in those
Mortgage Loans as to which the conditions for the application of those  sections
are  met. Rules regarding  periodic inclusion of  original issue discount income
are applicable  to mortgages  of  corporations originated  after May  27,  1969,
mortgages  of noncorporate mortgagors (other  than individuals) originated after
July 1, 1982, and mortgages of individuals originated after March 2, 1984. Under
the OID Regulations, such original issue discount could arise by the charging of
points by  the  originator  of the  mortgages  in  an amount  greater  than  the
statutory  DE MINIMIS exception, including a payment of points that is currently
deductible by the
 
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<PAGE>
borrower under applicable  Code provisions or,  under certain circumstances,  by
the  presence  of  "teaser"  rates  on  the  Mortgage  Loans.  See  "-- Stripped
Certificates" below regarding original issue discount on Stripped Certificates.
 
    Original issue discount generally must be reported as ordinary gross  income
as  it accrues  under a  constant interest  method that  takes into  account the
compounding of interest,  in advance of  the cash attributable  to such  income.
Unless   indicated  otherwise  in  the   applicable  Prospectus  Supplement,  no
prepayment assumption will  be assumed  for purposes of  such accrual.  However,
Code  Section 1272  provides for  a reduction  in the  amount of  original issue
discount includible in the income of a holder of an obligation that acquires the
obligation after its initial  issuance at a  price greater than  the sum of  the
original  issue price and  the previously accrued  original issue discount, less
prior payments of principal. Accordingly, if  such Mortgage Loans acquired by  a
Certificateholder  are purchased at  a price equal to  the then unpaid principal
amount of such Mortgage  Loans, no original issue  discount attributable to  the
difference  between the  issue price and  the original principal  amount of such
Mortgage Loans (I.E., points) will be includible by such holder.
 
    MARKET DISCOUNT.   Certificateholders  also will  be subject  to the  market
discount  rules  to the  extent  that the  conditions  for application  of those
sections are met. Market discount on  the Mortgage Loans will be determined  and
will  be reported  as ordinary  income generally  in the  manner described above
under "Federal Income  Tax Consequences  for REMIC Certificates  -- Taxation  of
Regular  Certificates  --  Market  Discount," except  that  the  ratable accrual
methods described therein will not apply. Rather, the holder will accrue  market
discount pro rata over the life of the Mortgage Loans, unless the constant yield
method  is  elected. Unless  indicated  otherwise in  the  applicable Prospectus
Supplement, no  prepayment  assumption will  be  assumed for  purposes  of  such
accrual.
 
    RECHARACTERIZATION OF SERVICING FEES
 
    If  the servicing fees paid  to a Servicer were  deemed to exceed reasonable
servicing compensation, the amount of such excess would represent neither income
nor  a  deduction  to   Certificateholders.  In  this   regard,  there  are   no
authoritative  guidelines  for  federal income  tax  purposes as  to  either the
maximum amount of servicing  compensation that may  be considered reasonable  in
the  context of  this or  similar transactions  or whether,  in the  case of the
Certificate, the reasonableness of  servicing compensation should be  determined
on  a  weighted  average  or  loan-by-loan basis.  If  a  loan-by-loan  basis is
appropriate, the likelihood that such  amount would exceed reasonable  servicing
compensation  as  to some  of the  Mortgage Loans  would be  increased. Recently
issued Internal  Revenue Service  guidance  indicates that  a servicing  fee  in
excess  of reasonable compensation ("excess  servicing") will cause the Mortgage
Loans to be treated under the "stripped bond" rules. Such guidance provides safe
harbors for  servicing  deemed  to  be  reasonable  and  requires  taxpayers  to
demonstrate  that the value of  servicing fees in excess  of such amounts is not
greater than the value of the services provided.
 
    Accordingly, if  the  Internal  Revenue  Service's  approach  is  upheld,  a
Servicer  who receives a servicing fee in excess of such amounts would be viewed
as retaining an ownership interest in a portion of the interest payments on  the
Mortgage  Loans.  Under  the  rules  of Code  Section  1286,  the  separation of
ownership of the right  to receive some  or all of the  interest payments on  an
obligation  from the right to  receive some or all  of the principal payments on
the obligation would  result in treatment  of such Mortgage  Loans as  "stripped
coupons"  and "stripped bonds."  Subject to the DE  MINIMIS rule discussed below
under "-- Stripped Certificates," each stripped bond or stripped coupon could be
considered for this purpose as a  non-interest bearing obligation issued on  the
date  of issue of the Certificates, and the original issue discount rules of the
Code would apply to the holder thereof. While Certificateholders would still  be
treated  as owners of beneficial interests in a grantor trust for federal income
tax purposes, the corpus of such trust could be viewed as excluding the  portion
of  the Mortgage Loans the ownership of  which is attributed to the Servicer, or
as including such portion  as a second class  of equitable interest.  Applicable
Treasury  regulations treat  such an  arrangement as  a fixed  investment trust,
since the  multiple classes  of  trust interests  should  be treated  as  merely
facilitating  direct  investments  in  the trust  assets  and  the  existence of
multiple classes of ownership
 
                                       88
<PAGE>
interests is incidental to that  purpose. In general, such a  recharacterization
should  not have  any significant  effect upon  the timing  or amount  of income
reported by  a Certificateholder,  except that  the income  reported by  a  cash
method holder may be slightly accelerated. See "Stripped Certificates" below for
a  further description of the federal income tax treatment of stripped bonds and
stripped coupons.
 
    SALE OR EXCHANGE OF CERTIFICATES
 
    Upon sale or exchange of  a Certificate, a Certificateholder will  recognize
gain or loss equal to the difference between the amount realized on the sale and
its  aggregate adjusted basis in the Mortgage Loans and other assets represented
by the Certificate.  In general,  the aggregate  adjusted basis  will equal  the
Certificateholder's  cost for  the Certificate, increased  by the  amount of any
income previously reported with respect to the Certificate and decreased by  the
amount of any losses previously reported with respect to the Certificate and the
amount  of any  distributions received  thereon. Except  as provided  above with
respect to  market  discount on  any  Mortgage  Loans, and  except  for  certain
financial  institutions subject  to the provisions  of Code  Section 582(c), any
such gain or loss generally would be capital gain or loss if the Certificate was
held as a  capital asset. However,  gain on the  sale of a  Certificate will  be
treated as ordinary income (i) if a Certificate is held as part of a "conversion
transaction"  as defined in Code  Section 1258(c), up to  the amount of interest
that would  have  accrued  on  the Certificateholder's  net  investment  in  the
conversion  transaction at  120% of the  appropriate applicable  Federal rate in
effect at the time  the taxpayer entered into  the transaction minus any  amount
previously  treated as ordinary income with  respect to any prior disposition of
property that was held as a  part of such transaction or  (ii) in the case of  a
non-corporate  taxpayer, to the extent such  taxpayer has made an election under
Code Section 163(d)(4) to have net  capital gains taxed as investment income  at
ordinary  income  rates.  Pursuant to  the  Revenue Reconciliation  Act  of 1993
capital gains of certain noncorporate taxpayers  are subject to a lower  maximum
tax  rate  than ordinary  income of  such  taxpayers. The  maximum tax  rate for
corporations is the same with respect to both ordinary income and capital gains.
 
STRIPPED CERTIFICATES
 
    GENERAL
 
    Pursuant to Code Section 1286, the  separation of ownership of the right  to
receive some or all of the principal payments on an obligation from ownership of
the  right  to receive  some  or all  of the  interest  payments results  in the
creation of "stripped bonds"  with respect to  principal payments and  "stripped
coupons"  with respect  to interest payments.  For purposes  of this discussion,
Certificates that are subject  to those rules will  be referred to as  "Stripped
Certificates." The Certificates will be subject to those rules if (i) the Seller
or  any  of its  affiliates  retains (for  its own  account  or for  purposes of
resale), in the form of Fixed Retained Yield or otherwise, an ownership interest
in a portion of the  payments on the Mortgage Loans,  (ii) the Seller or any  of
its  affiliates is treated as having an ownership interest in the Mortgage Loans
to the  extent it  is paid  (or  retains) servicing  compensation in  an  amount
greater  than  reasonable consideration  for servicing  the Mortgage  Loans (see
"Certificates -- Recharacterization of Servicing Fees" above), and (iii) a Class
of Certificates are issued in two or more Classes or Subclasses representing the
right to non-pro-rata percentages of the interest and principal payments on  the
Mortgage Loans.
 
    In  general, a holder  of a Stripped  Certificate will be  considered to own
"stripped bonds" with respect to its pro rata  share of all or a portion of  the
principal  payments on each Mortgage Loan and/or "stripped coupons" with respect
to its pro  rata share  of all or  a portion  of the interest  payments on  each
Mortgage  Loan,  including the  Stripped  Certificate's allocable  share  of the
servicing fees  paid to  a Servicer,  to  the extent  that such  fees  represent
reasonable  compensation for services  rendered. See the  discussion above under
"Certificates -- Recharacterization of Servicing  Fees." Although not free  from
doubt,  for purposes of reporting  to Stripped Certificateholders, the servicing
fees will  be  allocated to  the  Stripped  Certificates in  proportion  to  the
respective entitlements to distributions of each Class (or
 
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<PAGE>
Subclass) of Stripped Certificates for the related period or periods. The holder
of a Stripped Certificate generally will be entitled to a deduction each year in
respect  of  the  servicing  fees, as  described  above  under  "Certificates --
General," subject to the limitation described therein.
 
    Code Section 1286 treats a stripped  bond or a stripped coupon generally  as
an  obligation  issued at  an  original issue  discount  on the  date  that such
stripped interest is purchased. Although the treatment of Stripped  Certificates
for  federal income tax purposes is not  clear in certain respects at this time,
particularly where  such Stripped  Certificates  are issued  with respect  to  a
Mortgage  Pool  containing variable-rate  Mortgage  Loans, the  Seller  has been
advised by counsel that (i) the Trust Estate will be treated as a grantor  trust
under  subpart E, Part I of  subchapter J of the Code  and not as an association
taxable as a corporation or a "taxable mortgage pool" within the meaning of Code
Section 7701(i),  and (ii)  each Stripped  Certificate should  be treated  as  a
single  installment  obligation  for  purposes  of  calculating  original  issue
discount and  gain  or loss  on  disposition. This  treatment  is based  on  the
interrelationship of Code Section 1286, Code Sections 1272 through 1275, and the
OID  Regulations.  Although it  is possible  that  computations with  respect to
Stripped Certificates could  be made in  one of the  ways described below  under
"Taxation  of Stripped Certificates  -- Possible Alternative Characterizations,"
the OID Regulations state, in general, that two or more debt instruments  issued
by  a  single issuer  to a  single investor  in a  single transaction  should be
treated as a single debt instrument. Accordingly, for OID purposes, all payments
on any Stripped  Certificates should be  aggregated and treated  as though  they
were  made on a single debt instrument. The Pooling and Servicing Agreement will
require that the Trustee make and report all computations described below  using
this aggregate approach, unless substantial legal authority requires otherwise.
 
    Furthermore,  Treasury  regulations  issued December  28,  1992  provide for
treatment of a Stripped  Certificate as a single  debt instrument issued on  the
date it is purchased for purposes of calculating any original issue discount. In
addition,  under  these regulations,  a Stripped  Certificate that  represents a
right to payments of both interest and principal may be viewed either as  issued
with  original issue discount or  market discount (as described  below), at a DE
MINIMIS original issue discount,  or, presumably, at  a premium. This  treatment
indicates  that the interest  component of such a  Stripped Certificate would be
treated as qualified stated interest under  the OID Regulations, assuming it  is
not an interest-only or super-premium Stripped Certificate. Further, these final
regulations  provide that the  purchaser of such a  Stripped Certificate will be
required to account  for any discount  as market discount  rather than  original
issue  discount if either (i) the initial  discount with respect to the Stripped
Certificate was treated as zero under the DE MINIMIS rule, or (ii) no more  than
100  basis points in excess of reasonable  servicing is stripped off the related
Mortgage Loans. Any such market discount would be reportable as described  above
under  "Federal Income  Tax Consequences for  REMIC Certificates  -- Taxation of
Regular Certificates -- Market Discount," without regard to the DE MINIMIS  rule
therein, assuming that a prepayment assumption is employed in such computation.
 
    STATUS OF STRIPPED CERTIFICATES
 
    No  specific  legal authority  exists  as to  whether  the character  of the
Stripped Certificates, for federal income tax purposes, will be the same as that
of the Mortgage Loans. Although  the issue is not  free from doubt, counsel  has
advised the Seller that Stripped Certificates owned by applicable holders should
be  considered to represent "qualifying real  property loans" within the meaning
of Code  Section 593(d)(1),  "real estate  assets" within  the meaning  of  Code
Section  856(c)(5)(A),  "obligation[s]...principally secured  by an  interest in
real  property"  within   the  meaning  of   Code  Section  860G(a)(3)(A),   and
"loans...secured  by an  interest in real  property" within the  meaning of Code
Section 7701(a)(19)(C)(v),  and  interest (including  original  issue  discount)
income  attributable to Stripped Certificates  should be considered to represent
"interest on  obligations secured  by  mortgages on  real property"  within  the
meaning  of Code Section  856(c)(3)(B), provided that in  each case the Mortgage
Loans and  interest on  such  Mortgage Loans  qualify  for such  treatment.  The
application  of  such  Code  provisions  to  Buy-Down  Loans  is  uncertain. See
"Certificates -- Tax Status" above.
 
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<PAGE>
    TAXATION OF STRIPPED CERTIFICATES
 
    ORIGINAL ISSUE DISCOUNT.   Except as described  above under "General,"  each
Stripped Certificate will be considered to have been issued at an original issue
discount  for federal income tax purposes.  Original issue discount with respect
to a Stripped Certificate must be included in ordinary income as it accrues,  in
accordance  with  a  constant  interest  method  that  takes  into  account  the
compounding of  interest,  which  may  be  prior to  the  receipt  of  the  cash
attributable  to  such income.  Based in  part  on the  OID Regulations  and the
amendments to the original issue discount sections of the Code made by the  1986
Act, the amount of original issue discount required to be included in the income
of  a holder  of a  Stripped Certificate  (referred to  in this  discussion as a
"Stripped Certificateholder")  in  any  taxable year  likely  will  be  computed
generally  as described above  under "Federal Income  Tax Consequences for REMIC
Certificates -- Taxation of Regular Certificates -- Original Issue Discount" and
"-- Variable Rate Regular Certificates." However, with the apparent exception of
a Stripped  Certificate  issued  with  DE MINIMIS  original  issue  discount  as
described  above under "General," the issue price of a Stripped Certificate will
be the purchase  price paid by  each holder thereof,  and the stated  redemption
price  at maturity will include the aggregate  amount of the payments to be made
on the Stripped Certificate to such Stripped Certificateholder, presumably under
the Prepayment Assumption, other than qualified stated interest.
 
    If the Mortgage Loans  prepay at a  rate either faster  or slower than  that
under  the Prepayment Assumption, a  Stripped Certificateholder's recognition of
original issue discount will be either accelerated or decelerated and the amount
of such original issue discount will be either increased or decreased  depending
on  the  relative interests  in  principal and  interest  on each  Mortgage Loan
represented by such Stripped Certificateholder's Stripped Certificate. While the
matter is not free from  doubt, the holder of  a Stripped Certificate should  be
entitled  in the year that it  becomes certain (assuming no further prepayments)
that the  holder will  not  recover a  portion of  its  adjusted basis  in  such
Stripped  Certificate to recognize a loss (which may be a capital loss) equal to
such portion of unrecoverable basis.
 
    As an alternative to the method described  above, the fact that some or  all
of  the interest payments with respect to  the Stripped Certificates will not be
made if the  Mortgage Loans are  prepaid could lead  to the interpretation  that
such   interest  payments  are  "contingent"  within  the  meaning  of  the  OID
Regulations. The OID Regulations, as they relate to the treatment of  contingent
interest, are by their terms not applicable to prepayable securities such as the
Stripped  Certificates. However,  if final  regulations dealing  with contingent
interest with respect to the Stripped Certificates apply the same principles  as
the  OID Regulations,  such regulations may  lead to different  timing of income
inclusion than  would  be  the  case under  the  OID  Regulations.  Furthermore,
application of such principles could lead to the characterization of gain on the
sale  of contingent interest Stripped Certificates as ordinary income. Investors
should consult their  tax advisors  regarding the appropriate  tax treatment  of
Stripped Certificates.
 
    SALE  OR EXCHANGE OF STRIPPED CERTIFICATES.   Sale or exchange of a Stripped
Certificate prior to  its maturity  will result  in gain  or loss  equal to  the
difference,   if   any,   between   the  amount   received   and   the  Stripped
Certificateholder's adjusted basis  in such Stripped  Certificate, as  described
above  under "Federal Income Tax Consequences for REMIC Certificates -- Taxation
of Regular Certificates  -- Sale or  Exchange of Regular  Certificates." To  the
extent that a subsequent purchaser's purchase price is exceeded by the remaining
payments  on  the  Stripped  Certificates,  such  subsequent  purchaser  will be
required for federal income tax purposes to accrue and report such excess as  if
it  were original issue discount in the  manner described above. It is not clear
for this purpose whether the assumed prepayment  rate that is to be used in  the
case   of  a  Stripped   Certificateholder  other  than   an  original  Stripped
Certificateholder should be the Prepayment Assumption or a new rate based on the
circumstances at the date of subsequent purchase.
 
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<PAGE>
    PURCHASE OF MORE THAN ONE CLASS OF STRIPPED CERTIFICATES.  When an  investor
purchases  more than one Class of Stripped Certificates, it is currently unclear
whether for federal income  tax purposes such  Classes of Stripped  Certificates
should  be treated separately or aggregated  for purposes of the rules described
above.
 
    POSSIBLE  ALTERNATIVE  CHARACTERIZATIONS.    The  characterizations  of  the
Stripped  Certificates discussed above are not the only possible interpretations
of the applicable Code provisions.  For example, the Stripped  Certificateholder
may be treated as the owner of (i) one installment obligation consisting of such
Stripped  Certificate's pro rata share of the payments attributable to principal
on each Mortgage  Loan and a  second installment obligation  consisting of  such
Stripped  Certificate's pro rata share of  the payments attributable to interest
on each Mortgage Loan, (ii) as many stripped bonds or stripped coupons as  there
are  scheduled payments of  principal and/or interest on  each Mortgage Loan, or
(iii) a separate installment obligation for each Mortgage Loan, representing the
Stripped Certificate's pro rata share  of payments of principal and/or  interest
to  be  made with  respect thereto.  Alternatively,  the holder  of one  or more
Classes of Stripped  Certificates may  be treated  as the  owner of  a pro  rata
fractional  undivided interest  in each  Mortgage Loan  to the  extent that such
Stripped Certificate,  or Classes  of Stripped  Certificates in  the  aggregate,
represent  the same  pro rata  portion of  principal and  interest on  each such
Mortgage Loan, and  a stripped bond  or stripped  coupon (as the  case may  be),
treated as an installment obligation or contingent payment obligation, as to the
remainder.  Final  regulations issued  on December  28, 1992  regarding original
issue discount on stripped obligations  make the foregoing interpretations  less
likely  to be applicable. The preamble to those regulations states that they are
premised on  the assumption  that  an aggregation  approach is  appropriate  for
determining  whether  original issue  discount on  a  stripped bond  or stripped
coupon is DE MINIMIS, and solicits comments on appropriate rules for aggregating
stripped bonds and stripped coupons under Code Section 1286.
 
    Because of these possible varying characterizations of Stripped Certificates
and  the  resultant   differing  treatment  of   income  recognition,   Stripped
Certificateholders  are urged  to consult their  own tax  advisors regarding the
proper treatment of Stripped Certificates for federal income tax purposes.
 
REPORTING REQUIREMENTS AND BACKUP WITHHOLDING
 
    The Master Servicer will furnish, within a reasonable time after the end  of
each  calendar year, to each  Certificateholder or Stripped Certificateholder at
any time during  such year, such  information (prepared on  the basis  described
above)  as  is  necessary to  enable  such Certificateholders  to  prepare their
federal income tax returns. Such information will include the amount of original
issue  discount   accrued   on  Certificates   held   by  persons   other   than
Certificateholders exempted from the reporting requirements. The amount required
to  be reported by the Master Servicer may  not be equal to the proper amount of
original issue  discount  required  to  be  reported  as  taxable  income  by  a
Certificateholder,  other than  an original Certificateholder  that purchased at
the issue price.  In particular, in  the case of  Stripped Certificates,  unless
provided  otherwise in the applicable Prospectus Supplement, such reporting will
be based upon a representative initial offering price of each Class of  Stripped
Certificates.  The Master Servicer  will also file  such original issue discount
information with the Internal Revenue  Service. If a Certificateholder fails  to
supply  an accurate  taxpayer identification number  or if the  Secretary of the
Treasury determines that a Certificateholder  has not reported all interest  and
dividend  income required  to be  shown on  his federal  income tax  return, 31%
backup withholding may  be required in  respect of any  reportable payments,  as
described above under "Federal Income Tax Consequences for REMIC Certificates --
Backup Withholding."
 
TAXATION OF CERTAIN FOREIGN INVESTORS
 
    To  the extent that a Certificate evidences ownership in Mortgage Loans that
are issued on or before July 18, 1984, interest or original issue discount  paid
by  the  person required  to withhold  tax under  Code Section  1441 or  1442 to
nonresident aliens, foreign  corporations, or other  non-U.S. persons  ("foreign
persons")  generally will  be subject to  30% United States  withholding tax, or
such
 
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lower rate as may be provided for interest by an applicable tax treaty.  Accrued
original  issue  discount recognized  by the  Certificateholder  on the  sale or
exchange of such a Certificate also will be subject to federal income tax at the
same rate.
 
    Treasury regulations provide that interest  or original issue discount  paid
by  the  Trustee  or other  withholding  agent  to a  foreign  person evidencing
ownership interest  in  Mortgage  Loans  issued after  July  18,  1984  will  be
"portfolio interest" and will be treated in the manner, and such persons will be
subject  to the same certification  requirements, described above under "Federal
Income Tax Consequences for  REMIC Certificates --  Taxation of Certain  Foreign
Investors -- Regular Certificates."
 
                              ERISA CONSIDERATIONS
 
GENERAL
 
    The  Employee Retirement Income Security Act  of 1974, as amended ("ERISA"),
imposes certain requirements on those employee benefit plans to which it applies
("Plans") and on those persons who  are fiduciaries with respect to such  Plans.
The  following  is  a  general  discussion  of  such  requirements,  and certain
applicable exceptions to and  administrative exemptions from such  requirements.
For  purposes of this discussion, a person  investing on behalf of an individual
retirement account established under Code Section 408 (an "IRA") is regarded  as
a fiduciary and the IRA as a Plan.
 
    Before purchasing any Certificates, a Plan fiduciary should consult with its
counsel  and determine  whether there  exists any  prohibition to  such purchase
under the requirements of ERISA, whether prohibited transaction exemptions  such
as  PTE 83-1  or any  individual administrative  exemption (as  described below)
applies, including whether the appropriate conditions set forth therein would be
met, or whether  any statutory prohibited  transaction exemption is  applicable,
and further should consult the applicable Prospectus Supplement relating to such
Series of Certificates.
 
CERTAIN REQUIREMENTS UNDER ERISA
 
    GENERAL.   In  accordance with  ERISA's general  fiduciary standards, before
investing in a Certificate a Plan fiduciary should determine whether to do so is
permitted under the governing Plan instruments  and is appropriate for the  Plan
in view of its overall investment policy and the composition and diversification
of  its  portfolio.  A  Plan  fiduciary  should  especially  consider  the ERISA
requirement of investment  prudence and  the sensitivity  of the  return on  the
Certificates  to the rate of principal repayments (including prepayments) on the
Mortgage Loans, as discussed in "Prepayment and Yield Considerations" herein.
 
    PARTIES IN INTEREST/DISQUALIFIED  PERSONS.  Other  provisions of ERISA  (and
corresponding  provisions of  the Code) prohibit  certain transactions involving
the assets of a Plan and persons who have certain specified relationships to the
Plan  (so-called  "parties  in  interest"   within  the  meaning  of  ERISA   or
"disqualified  persons" within the meaning of  the Code). The Seller, the Master
Servicer or Master Servicer or the  Trustee or certain affiliates thereof  might
be  considered or might  become "parties in  interest" or "disqualified persons"
with respect to a Plan. If so, the acquisition or holding of Certificates by  or
on  behalf  of such  Plan  could be  considered to  give  rise to  a "prohibited
transaction" within the meaning of ERISA  and the Code unless an  administrative
exemption described below or some other exemption is available.
 
    Special  caution should be exercised before  the assets of a Plan (including
assets that may be held in  an insurance company's separate or general  accounts
where  assets in such accounts may be  deemed Plan assets for purposes of ERISA)
are used to purchase a Certificate if, with respect to such assets, the  Seller,
the  Master Servicer or Master  Servicer or the Trustee  or an affiliate thereof
either: (a) has  investment discretion with  respect to the  investment of  such
assets  of  such  Plan; or  (b)  has  authority or  responsibility  to  give, or
regularly gives, investment  advice with respect  to such assets  for a fee  and
pursuant  to an  agreement or  understanding that  such advice  will serve  as a
primary basis for investment decisions with respect to such assets and that such
advice will be based on the particular investment needs of the Plan.
 
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<PAGE>
    DELEGATION OF FIDUCIARY DUTY.   Further, if the  assets included in a  Trust
Estate  were deemed  to constitute  Plan assets,  it is  possible that  a Plan's
investment in the Certificates might be deemed to constitute a delegation, under
ERISA, of the duty to manage Plan assets by the fiduciary deciding to invest  in
the  Certificates, and  certain transactions  involved in  the operation  of the
Trust Estate might be deemed  to constitute prohibited transactions under  ERISA
and the Code. Neither ERISA nor the Code define the term "plan assets."
 
    The  U.S. Department of Labor (the "Department") has issued regulations (the
"Regulations") concerning whether  or not  a Plan's  assets would  be deemed  to
include  an interest  in the  underlying assets  of an  entity (such  as a Trust
Estate) for  purposes of  the  reporting and  disclosure and  general  fiduciary
responsibility  provisions of ERISA,  as well as  for the prohibited transaction
provisions of ERISA  and the  Code, if the  Plan acquires  an "equity  interest"
(such as a Certificate) in such an entity.
 
    Certain  exceptions  are provided  in the  Regulations whereby  an investing
Plan's assets would be deemed merely to include its interest in the Certificates
instead of being deemed to include an interest in the assets of a Trust  Estate.
However,  it cannot  be predicted  in advance  nor can  there be  any continuing
assurance whether such exceptions may be  met, because of the factual nature  of
certain  of the  rules set  forth in  the Regulations.  For example,  one of the
exceptions in the  Regulations states that  the underlying assets  of an  entity
will  not be  considered "plan  assets" if  less than  25% of  the value  of all
classes of equity  interests are  held by  "benefit plan  investors," which  are
defined  as Plans, IRAs,  and employee benefit  plans not subject  to ERISA (for
example, governmental plans),  but this  exception is  tested immediately  after
each  acquisition  of an  equity  interest in  the  entity whether  upon initial
issuance or in the secondary market.
 
ADMINISTRATIVE EXEMPTIONS
 
    INDIVIDUAL   ADMINISTRATIVE   EXEMPTIONS.       Several   underwriters    of
mortgage-backed  securities  have  applied  for  and  obtained  ERISA prohibited
transaction exemptions (each,  an "Underwriter's Exemption")  which are in  some
respects  broader than  Prohibited Transaction  Class Exemption  83-1 (described
below). Such  exemptions can  only apply  to mortgage-backed  securities  which,
among  other conditions,  are sold  in an  offering with  respect to  which such
underwriter serves as the  sole or a  managing underwriter, or  as a selling  or
placement  agent. If  such an Underwriter's  Exemption might be  applicable to a
Series of Certificates, the applicable Prospectus Supplement will refer to  such
possibility.
 
    Among  the conditions that must be  satisfied for an Underwriter's Exemption
to apply are the following:
 
       (1) The acquisition of Certificates by a Plan is on terms (including  the
           price  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;
 
       (2) The  rights and interests  evidenced by Certificates  acquired by the
           Plan are not subordinated  to the rights  and interests evidenced  by
    other Certificates of the Trust Estate;
 
       (3) The  Certificates acquired by the Plan  have received a rating at the
           time of such  acquisition that is  one of the  three highest  generic
    rating  categories from either Standard  & Poor's ("S&P"), Moody's Investors
    Service, Inc. ("Moody's"), Duff & Phelps Credit Rating Co. ("DCR") or  Fitch
    Investors Service, L.P. ("Fitch");
 
       (4) The  Trustee must  not be  an affiliate  of any  other member  of the
           Restricted Group (as defined below);
 
       (5) The sum of all  payments made to and  retained by the underwriter  in
           connection  with the distribution of Certificates represents not more
    than reasonable compensation for underwriting  the Certificates. The sum  of
    all  payments made to and retained by  the Seller pursuant to the assignment
    of the Mortgage Loans to the Trust Estate represents not more than the  fair
    market  value of such  Mortgage Loans. The  sum of all  payments made to and
    retained by the Servicer (and
 
                                       94
<PAGE>
    any other servicer)  represents not  more than  reasonable compensation  for
    such  person's  services  under  the  Pooling  and  Servicing  Agreement and
    reimbursement of such person's reasonable expenses in connection  therewith;
    and
 
       (6) The Plan investing in the Certificates is an "accredited investor" as
           defined  in  Rule 501(a)(1)  of Regulation  D  of the  Securities and
    Exchange Commission under the Securities Act of 1933.
 
    The Trust Estate must also meet the following requirements:
 
              (i)
               the assets of the Trust Estate  must consist solely of assets  of
               the type that have been included in other investment pools in the
       marketplace;
 
             (ii)
               certificates  in such other investment pools must have been rated
               in one of the  three highest rating  categories of S&P,  Moody's,
       Fitch or DCR for at least one year prior to the Plan's acquisition of the
       Certificates; and
 
            (iii)
               certificates  evidencing interests in such other investment pools
               must have been  purchased by  investors other than  Plans for  at
       least one year prior to any Plan's acquisition of the Certificates.
 
    If  the conditions to an  Underwriter's Exemption are met,  whether or not a
Plan's assets would be deemed to  include an ownership interest in the  Mortgage
Loans   in  a  mortgage  pool,  the  acquisition,  holding  and  resale  of  the
Certificates by Plans would be exempt from the prohibited transaction provisions
of ERISA and the Code.
 
    Moreover,  an  Underwriter's  Exemption  can  provide  relief  from  certain
self-dealing/conflict  of interest prohibited  transactions that may  occur if a
Plan fiduciary causes a Plan to acquire Certificates in a Trust Estate in  which
the fiduciary (or its affiliate) is an obligor on the Mortgage Loans held in the
Trust  Estate provided  that, among  other requirements: (i)  in the  case of an
acquisition in connection with  the initial issuance  of Certificates, at  least
fifty  percent of  each class  of Certificates in  which Plans  have invested is
acquired by  persons independent  of the  Restricted Group  and at  least  fifty
percent  of the aggregate  interest in the  Trust Estate is  acquired by persons
independent of the Restricted Group (as defined below); (ii) such fiduciary  (or
its  affiliate) is an obligor  with respect to five percent  or less of the fair
market value of  the Mortgage  Loans contained in  the Trust  Estate; (iii)  the
Plan's  investment  in Certificates  of any  Class  does not  exceed twenty-five
percent of all of the Certificates of that Class outstanding at the time of  the
acquisition  and (iv) immediately after the acquisition no more than twenty-five
percent of  the assets  of the  Plan  with respect  to which  such person  is  a
fiduciary  are invested in Certificates representing  an interest in one or more
trusts containing assets sold or served by the same entity.
 
    An Underwriter's Exemption does not apply to Plans sponsored by the  Seller,
the  underwriter specified in  the applicable Prospectus  Supplement, the Master
Servicer, the Trustee, the Servicer, any obligor with respect to Mortgage  Loans
included  in  the  Trust  Estate  constituting more  than  five  percent  of the
aggregate unamortized principal balance  of the assets in  the Trust Estate,  or
any affiliate of such parties (the "Restricted Group").
 
    PTE   83-1.    Prohibited  Transaction  Class  Exemption  83-1  for  Certain
Transactions Involving  Mortgage Pool  Investment  Trusts ("PTE  83-1")  permits
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 Plans, whether or not the
Plan's  assets would be deemed to include an ownership interest in the mortgages
in such mortgage pools, and whether or not such transactions would otherwise  be
prohibited under ERISA.
 
    The  term "mortgage pool pass-through certificate" is defined in PTE 83-1 as
"a certificate  representing a  beneficial undivided  fractional interest  in  a
mortgage  pool and  entitling the holder  of such a  certificate to pass-through
payment of principal and interest from the pooled mortgage loans, less any  fees
retained  by the pool sponsor."  It appears that, for  purposes of PTE 83-1, the
term
 
                                       95
<PAGE>
"mortgage pool pass-through certificate" would include Certificates issued in  a
single  Class or in  multiple Classes that evidence  the beneficial ownership of
both a  specified  percentage  of  future  interest  payments  (after  permitted
deductions)  and a specified percentage of  future principal payments on a Trust
Estate.
 
    However, it appears that PTE  83-1 does or might  not apply to the  purchase
and holding of (a) Certificates that evidence the beneficial ownership only of a
specified percentage of future interest payments (after permitted deductions) on
a Trust Estate or only of a specified percentage of future principal payments on
a Trust Estate, (b) Residual Certificates, (c) Certificates evidencing ownership
interests in a Trust Estate which includes Mortgage Loans secured by multifamily
residential  properties or shares issued by cooperative housing corporations, or
(d) Certificates which are subordinated to other Classes of Certificates of such
Series. Accordingly, unless exemptive relief other than PTE 83-1 applies,  Plans
should not purchase any such Certificates.
 
    PTE  83-1 sets forth  "general conditions" and  "specific conditions" to its
applicability.  Section  II  of  PTE  83-1  sets  forth  the  following  general
conditions  to the application of the exemption: (i) the maintenance of a system
of insurance or other protection for  the pooled mortgage loans or the  property
securing  such loans, and for indemnifying certificateholders against reductions
in pass-through payments due  to property damage or  defaults in loan  payments;
(ii)  the  existence of  a pool  trustee who  is  not an  affiliate of  the pool
sponsor; and  (iii) a  requirement that  the sum  of all  payments made  to  and
retained  by the pool sponsor, and all funds  inuring to the benefit of the pool
sponsor as a result of the  administration of the mortgage pool, must  represent
not  more  than  adequate  consideration for  selling  the  mortgage  loans plus
reasonable compensation for services provided by  the pool sponsor to the  pool.
The  system of  insurance or  protection referred  to in  clause (i)  above must
provide such protection and  indemnification up to an  amount not less than  the
greater  of one percent of the aggregate  unpaid principal balance of the pooled
mortgages or the unpaid principal balance  of the largest mortgage in the  pool.
It  should be noted that in promulgating PTE 83-1 (and a predecessor exemption),
the Department did not  have under its consideration  interests in pools of  the
exact nature as some of the Certificates described herein.
 
EXEMPT PLANS
 
    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 ERISA requirements and  assets of such plans may be  invested
in  Certificates without regard to the  ERISA considerations described above but
such plans may  be subject  to the provisions  of other  applicable federal  and
state law.
 
UNRELATED BUSINESS TAXABLE INCOME -- RESIDUAL CERTIFICATES
 
    The  purchase  of  a  Residual  Certificate  by  any  employee  benefit plan
qualified under Code Section 401(a) and exempt from taxation under Code  Section
501(a),  including most  varieties of ERISA  Plans, may give  rise to "unrelated
business taxable  income"  as  described  in Code  Sections  511-515  and  860E.
Further,   prior  to  the  purchase  of  Residual  Certificates,  a  prospective
transferee may be required to  provide an affidavit to  a transferor that it  is
not,  nor is it purchasing a Residual  Certificate on behalf of, a "Disqualified
Organization," which term as defined above includes certain tax-exempt  entities
not subject to Code Section 511 such as certain governmental plans, as discussed
above  under the  caption "Certain  Federal Income  Tax Consequences  -- Federal
Income  Tax  Consequences  for  REMIC  Certificates  --  Taxation  of   Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual Certificates --
Disqualified Organizations."
 
    DUE  TO THE COMPLEXITY OF THESE RULES AND THE PENALTIES IMPOSED UPON PERSONS
INVOLVED IN PROHIBITED TRANSACTIONS, IT IS PARTICULARLY IMPORTANT THAT POTENTIAL
INVESTORS WHO  ARE PLAN  FIDUCIARIES CONSULT  WITH THEIR  COUNSEL REGARDING  THE
CONSEQUENCES UNDER ERISA OF THEIR ACQUISITION AND OWNERSHIP OF CERTIFICATES.
 
                                       96
<PAGE>
    THE  SALE OF CERTIFICATES TO A PLAN IS IN NO RESPECT A REPRESENTATION BY THE
SELLER OR THE  APPLICABLE UNDERWRITER  THAT THIS INVESTMENT  MEETS ALL  RELEVANT
LEGAL  REQUIREMENTS  WITH  RESPECT  TO INVESTMENTS  BY  PLANS  GENERALLY  OR ANY
PARTICULAR PLAN, OR THAT THIS INVESTMENT  IS APPROPRIATE FOR PLANS GENERALLY  OR
ANY PARTICULAR PLAN.
 
                                LEGAL INVESTMENT
 
    As  will  be  specified  in the  applicable  Prospectus  Supplement, certain
Classes of  Certificates  will  constitute  "mortgage  related  securities"  for
purposes  of the Secondary Mortgage Market  Enhancement Act of 1984 ("SMMEA") so
long as they are rated in one of  the two highest rating categories by at  least
one Rating Agency. As "mortgage related securities" such Classes will constitute
legal investments for persons, trusts, corporations, partnerships, associations,
business   trusts  and   business  entities   (including  but   not  limited  to
state-chartered savings banks, commercial  banks, savings and loan  associations
and  insurance  companies, as  well as  trustees  and state  government employee
retirement systems) created pursuant to or existing under the laws of the United
States or of  any state  (including the District  of Columbia  and Puerto  Rico)
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 investments for such entities.  Pursuant to SMMEA, a number  of
states  enacted legislation, on or  before the October 3,  1991 cut-off for such
enactments, limiting  to varying  extents the  ability of  certain entities  (in
particular, SMMEA insurance companies) to invest in mortgage related securities,
in  most cases by requiring the affected  investors to rely solely upon existing
state  law,  and  not  SMMEA.  Accordingly,  the  investors  affected  by   such
legislation  will be authorized to invest in the Certificates only to the extent
provided in such legislation.
 
    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  mortgage
related  securities  without limitation  as to  the  percentage of  their assets
represented thereby,  federal  credit  unions may  invest  in  mortgage  related
securities,  and  national banks  may purchase  mortgage related  securities for
their own  account without  regard to  the limitations  generally applicable  to
investment  securities set forth  in 12 U.S.C. Section  24 (Seventh), subject in
each case to such regulations as the applicable federal regulatory authority may
prescribe. In  this connection,  federal credit  unions should  review  National
Credit Union Administration ("NCUA") Letter to Credit Unions No. 96, as modified
by  Letter to Credit Unions No. 108, which includes guidelines to assist federal
credit unions in  making investment decisions  for mortgage related  securities.
The  NCUA has adopted  rules, codified as 12  C.F.R. Section 703.5(f)-(k), which
prohibit federal  credit  unions  from investing  in  certain  mortgage  related
securities  (such as the  Residual Certificates and  the Stripped Certificates),
except under limited circumstances.
 
    All depository institutions  considering an investment  in the  Certificates
should  review the "Supervisory Policy Statement on Securities Activities" dated
January 28, 1992,  as revised  April 15, 1994  (the "Policy  Statement") of  the
Federal  Financial Institutions Examination Council. The Policy Statement, which
has been adopted by the  Board of Governors of  the Federal Reserve System,  the
Federal  Deposit Insurance Corporation, the Comptroller  of the Currency and the
Office of  Thrift Supervision  and  by the  NCUA (with  certain  modifications),
prohibits  depository institutions from investing in certain "high-risk mortgage
securities" (including  securities such  as certain  Series and  Classes of  the
Certificates),  except  under  limited  circumstances,  and  sets  forth certain
investment practices deemed to be unsuitable for regulated institutions.
 
    Institutions whose  investment  activities  are  subject  to  regulation  by
federal  or  state  authorities  should review  rules,  policies  and guidelines
adopted from  time to  time by  such authorities  before purchasing  any of  the
Certificates,  as certain Series  or Classes (in  particular, Certificates which
are entitled  solely  or disproportionately  to  distributions of  principal  or
interest)  may be deemed unsuitable investments, or may otherwise be restricted,
under such rules, policies or  guidelines (in certain instances irrespective  of
SMMEA).
 
                                       97
<PAGE>
    The  foregoing  does  not  take  into  consideration  the  applicability  of
statutes,  rules,  regulations,  orders,  guidelines  or  agreements   generally
governing  investments made by a particular investor, including, but not limited
to, "prudent investor" provisions, percentage-of-assets limits, provisions which
may  restrict   or   prohibit   investment   in   securities   which   are   not
"interest-bearing"  or  "income-paying," and,  with  regard to  any Certificates
issued in book-entry form, provisions which may restrict or prohibit investments
in securities which are issued in book-entry form.
 
    Except as to  the status  of certain  Classes of  Certificates as  "mortgage
related securities," no representation is made as to the proper characterization
of  the  Certificates  for  legal  investment  purposes,  financial  institution
regulatory purposes,  or other  purposes, or  as to  the ability  of  particular
investors   to   purchase   Certificates  under   applicable   legal  investment
restrictions. The  uncertainties described  above  (and any  unfavorable  future
determinations  concerning legal investment  or financial institution regulatory
characteristics of the Certificates) may  adversely affect the liquidity of  the
Certificates.
 
    All  investors should consult  with their own  legal advisors in determining
whether and to  what extent  the Certificates constitute  legal investments  for
such investors.
 
                              PLAN OF DISTRIBUTION
 
    The  Certificates are being offered hereby in  Series through one or more of
the methods  described  below. The  applicable  Prospectus Supplement  for  each
Series  will describe the method of offering  being utilized for that Series and
will state the public offering or  purchase price of each Class of  Certificates
of  such Series, or the method by which  such price is to be determined, and the
net proceeds to the Seller from such sale.
 
    The Certificates will be offered through the following methods from time  to
time  and offerings  may be  made concurrently  through more  than one  of these
methods or  an offering  of a  particular  Series of  Certificates may  be  made
through a combination of two or more of these methods:
 
       1.  By  negotiated firm commitment underwriting and public re-offering by
           underwriters specified in the applicable Prospectus Supplement;
 
       2.  By placements by the Seller with investors through dealers; and
 
       3.  By direct placements by the Seller with investors.
 
    If underwriters are used  in a sale of  any Certificates, such  Certificates
will  be acquired by  the underwriters for  their own account  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  to be
determined at the  time of  sale or  at the  time of  commitment therefor.  Firm
commitment  underwriting  and  public  reoffering by  underwriters  may  be done
through underwriting syndicates or through one  or more firms acting alone.  The
specific managing underwriter or underwriters, if any, with respect to the offer
and  sale of a particular Series of Certificates  will be set forth on the cover
of the Prospectus Supplement  applicable to such Series  and the members of  the
underwriting syndicate, if any, will be named in such Prospectus Supplement. The
Prospectus  Supplement will describe any discounts and commissions to be allowed
or paid  by  the  Seller  to the  underwriters,  any  other  items  constituting
underwriting  compensation and  any discounts and  commissions to  be allowed or
paid to the  dealers. The  obligations of the  underwriters will  be subject  to
certain  conditions precedent.  The underwriters with  respect to a  sale of any
Class of Certificates will be obligated to purchase all such Certificates if any
are purchased.  The  Seller, and,  if  specified in  the  applicable  Prospectus
Supplement, Norwest Mortgage, will indemnify the applicable underwriters against
certain civil liabilities, including liabilities under the Securities Act.
 
                                       98
<PAGE>
    The Prospectus Supplement with respect to any Series of Certificates offered
other than through underwriters will contain information regarding the nature of
such  offering and  any agreements  to be  entered into  between the  Seller and
dealers and/or the Seller and purchasers of Certificates of such Series.
 
    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 Securities Act in connection  with reoffers and sales by them  of
Certificates.  Certificateholders should  consult with  their legal  advisors in
this regard prior to any such reoffer or sale.
 
    If  specified  in  the  Prospectus  Supplement  relating  to  a  Series   of
Certificates,  the Seller or any  affiliate thereof may purchase  some or all of
one or  more Classes  of Certificates  of such  Series from  the underwriter  or
underwriters  at a price  specified or described  in such Prospectus Supplement.
Such purchaser may thereafter from time to time offer and sell, pursuant to this
Prospectus, some or all of such Certificates so purchased directly, through  one
or  more  underwriters to  be designated  at the  time of  the offering  of such
Certificates or through dealers acting as agent and/or principal. Such  offering
may  be restricted in  the matter specified in  such Prospectus Supplement. Such
transactions may be effected at market prices prevailing at the time of sale, at
negotiated prices or at fixed prices. The underwriters and dealers participating
in such purchaser's offering  of such Certificates  may receive compensation  in
the  form of underwriting discounts or  commissions from such purchaser and such
dealers may receive commissions from the investors purchasing such  Certificates
for  whom they may act as agent  (which discounts or commissions will not exceed
those customary  in  those types  of  transactions involved).  Any  dealer  that
participates  in the distribution  of such Certificates  may be deemed  to be an
"underwriter" within the meaning of the Securities Act, and any commissions  and
discounts  received  by  such  dealer  and any  profit  on  the  resale  of such
Certificates by such  dealer might be  deemed to be  underwriting discounts  and
commissions under the Securities Act.
 
                                USE OF PROCEEDS
 
    The  net proceeds from the sale of  each Series of Certificates will be used
by the  Seller  for  the purchase  of  the  Mortgage Loans  represented  by  the
Certificates  of such Series from Norwest  Mortgage. It is expected that Norwest
Mortgage will use the proceeds from the sale of the Mortgage Loans to the Seller
for  its  general   business  purposes,  including,   without  limitation,   the
origination or acquisition of new mortgage loans and the repayment of borrowings
incurred  to finance the origination or acquisition of mortgage loans, including
the Mortgage Loans underlying the Certificates of such Series.
 
                                 LEGAL MATTERS
 
    Certain legal  matters, including  the federal  income tax  consequences  to
Certificateholders  of an  investment in the  Certificates of a  Series, will be
passed upon for the Seller by Cadwalader, Wickersham & Taft, New York.
 
                                     RATING
 
    It is a condition to the issuance of the Certificates of any Series  offered
pursuant  to this Prospectus and  a Prospectus Supplement that  they be rated in
one of the four highest categories by at least one Rating Agency.
 
    A securities 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 securities rating  should be evaluated  independently of any other
rating.
 
                                       99
<PAGE>
                        INDEX OF SIGNIFICANT DEFINITIONS
 
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Accrual Certificates.....................................................................................         35
Act......................................................................................................          2
Advances.................................................................................................         46
ALTA.....................................................................................................         25
Balloon Loan.............................................................................................         19
Balloon Period...........................................................................................         19
Bankruptcy Code..........................................................................................         62
Bankruptcy Loss..........................................................................................         37
Bankruptcy Loss Amount...................................................................................         37
Beneficial Owner.........................................................................................         32
Book-Entry Certificates..................................................................................         11
Buy-Down Fund............................................................................................         18
Buy-Down Loans...........................................................................................         18
Cede.....................................................................................................         32
CERCLA...................................................................................................         63
Certificate Account......................................................................................         43
Certificateholder........................................................................................         32
Certificates.............................................................................................      Cover
Class....................................................................................................      Cover
Cleanup Costs............................................................................................         63
Code.....................................................................................................         11
Commission...............................................................................................          2
Correspondents...........................................................................................         20
Credit Score.............................................................................................         22
DCR......................................................................................................         94
Deferred Interest........................................................................................         17
Definitive Certificates..................................................................................         11
Delegated Underwriting...................................................................................         21
Department...............................................................................................         94
Depository...............................................................................................         43
Detailed Information.....................................................................................          2
Disqualified Organization................................................................................         80
Distribution Date........................................................................................          9
DTC......................................................................................................         11
DTC Participants.........................................................................................         32
Due Date.................................................................................................         16
Due on Sale..............................................................................................         64
EDGAR....................................................................................................          2
Eligible Custodial Account...............................................................................         44
ERISA....................................................................................................         11
Excess Bankruptcy Losses.................................................................................         37
Excess Fraud Losses......................................................................................         37
Excess Special Hazard Losses.............................................................................         37
FDIC.....................................................................................................         44
FHLBB....................................................................................................         65
FHLMC....................................................................................................         25
Fitch....................................................................................................         94
Fixed Retained Yield.....................................................................................         35
FNMA.....................................................................................................         25
Fraud Loss...............................................................................................         37
</TABLE>
 
                                      100
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Fraud Loss Amount........................................................................................         37
Garn Act.................................................................................................         65
GEMICO...................................................................................................         25
Indirect DTC Participants................................................................................         32
IRA......................................................................................................         93
Joint Ventures...........................................................................................         20
Liquidation Proceeds.....................................................................................         44
Loan Stores..............................................................................................         20
Master Servicer..........................................................................................      Cover
Master Servicing Fee.....................................................................................         35
Moody's..................................................................................................         94
Mortgage Interest Rate...................................................................................         35
Mortgage Loans...........................................................................................      Cover
Mortgage Notes...........................................................................................         15
Mortgaged Properties.....................................................................................         15
Mortgages................................................................................................         15
NASCOR...................................................................................................      Cover
NCUA.....................................................................................................         97
Net Foreclosure Profits..................................................................................         35
1986 Act.................................................................................................         69
Non-Pro Rata Certificate.................................................................................         70
Non-U.S. Person..........................................................................................         85
Norwest Bank.............................................................................................      Cover
Norwest Corporation......................................................................................         19
Norwest Funding..........................................................................................         19
Norwest Mortgage.........................................................................................      Cover
Norwest Mortgage Loan....................................................................................         19
Norwest Mortgage Sale Agreement..........................................................................         53
OID Regulations..........................................................................................         70
Other Advances...........................................................................................         46
OTS......................................................................................................         65
Partial Liquidation Proceeds.............................................................................         34
Pass-Through Rate........................................................................................          9
Pass-Through Entity......................................................................................         80
Paying Agent.............................................................................................         46
Percentage Interest......................................................................................         34
Periodic Advances........................................................................................         10
PHMC.....................................................................................................         19
PHMC Mortgage Loans......................................................................................         19
Plans....................................................................................................         93
Policy Statement.........................................................................................         97
Pool Distribution Amount.................................................................................         34
Pool Insurers............................................................................................         25
Pooling and Servicing Agreement..........................................................................          8
Prepayment Assumption....................................................................................         70
Program Loans............................................................................................         42
Proposed Mark to Market Regulations......................................................................         82
PTE 83-1.................................................................................................         96
Qualified Mortgage.......................................................................................         30
Rating Agency............................................................................................         12
Record Date..............................................................................................         10
Regular Certificateholder................................................................................         69
</TABLE>
 
                                      101
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Regular Certificates.....................................................................................         31
Regulations..............................................................................................         94
Relief Act...............................................................................................         63
REMIC....................................................................................................      Cover
REMIC Certificates.......................................................................................         67
REMIC Pool...............................................................................................         67
REMIC Regulations........................................................................................         67
Remittance Date..........................................................................................         44
Reserve Fund.............................................................................................         38
Residual Certificates....................................................................................         31
Residual Holders.........................................................................................         76
Restricted Group.........................................................................................         95
Rules....................................................................................................         32
S&P......................................................................................................         94
SBJPA of 1996............................................................................................         67
Securities Act...........................................................................................          2
Seller...................................................................................................      Cover
Senior Certificates......................................................................................      Cover
Series...................................................................................................      Cover
Servicer.................................................................................................      Cover
Servicer Custodial Account...............................................................................         44
Servicing Account........................................................................................         47
Servicing Fee............................................................................................         35
SMMEA....................................................................................................         97
Special Hazard Loss......................................................................................         37
Special Hazard Loss Amounts..............................................................................         37
Standard Hazard Insurance Policy.........................................................................         49
Startup Day..............................................................................................         68
Stripped Certificateholder...............................................................................         91
Stripped Certificates....................................................................................         90
Subclass.................................................................................................      Cover
Subordinated Certificates................................................................................      Cover
Subsidy Account..........................................................................................         17
Subsidy Loans............................................................................................         17
Subsidy Payments.........................................................................................         17
Superlien................................................................................................         64
Title V..................................................................................................         66
T.O.P. Loans.............................................................................................         25
Treasury Regulations.....................................................................................         54
Trust Estate.............................................................................................      Cover
Trustee..................................................................................................         59
Trustee Fee..............................................................................................         35
U.S. Person..............................................................................................         81
UCC......................................................................................................         61
UGRIC....................................................................................................         25
Underlying Servicing Agreement...........................................................................          8
Underwriter's Exemption..................................................................................         94
Voting Interests.........................................................................................         56
Window Period............................................................................................         65
Window Period Loans......................................................................................         65
Window Period States.....................................................................................         65
</TABLE>
 
                                      102
<PAGE>
- ---------------------------------------------------------
                       ---------------------------------------------------------
- ---------------------------------------------------------
                       ---------------------------------------------------------
 
    NO DEALER, SALESMAN, OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS
SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS, AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE SELLER, OR BY THE UNDERWRITER. NEITHER THIS PROSPECTUS SUPPLEMENT NOR THE
ACCOMPANYING PROSPECTUS CONSTITUTES AN OFFER TO SELL OR A SOLICITATION OF AN
OFFER TO BUY ANY OF THE SECURITIES OFFERED HEREBY IN ANY JURISDICTION TO ANY
PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER IN SUCH JURISDICTION. NEITHER
THE DELIVERY OF THIS PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS NOR
ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION
THAT THE INFORMATION HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE
HEREOF OR THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE SELLER OR SINCE
SUCH DATE.
 
                            ------------------------
 
                                     INDEX
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                      PAGE
                                                    ---------
<S>                                                 <C>
TABLE OF CONTENTS.................................        S-5
SUMMARY INFORMATION...............................        S-6
RISK FACTORS......................................       S-29
DESCRIPTION OF THE CERTIFICATES...................       S-30
DESCRIPTION OF MORTGAGE LOANS.....................       S-56
DELINQUENCY AND FORECLOSURE
  EXPERIENCE......................................       S-61
PREPAYMENT AND YIELD CONSIDERATIONS...............       S-66
POOLING AND SERVICING AGREEMENT...................       S-78
SERVICING OF THE MORTGAGE LOANS...................       S-80
FEDERAL INCOME TAX CONSIDERATIONS.................       S-84
ERISA CONSIDERATIONS..............................       S-86
LEGAL INVESTMENT..................................       S-88
SECONDARY MARKET..................................       S-88
UNDERWRITING......................................       S-89
LEGAL MATTERS.....................................       S-89
USE OF PROCEEDS...................................       S-89
RATINGS...........................................       S-89
INDEX OF SIGNIFICANT PROSPECTUS SUPPLEMENT
  DEFINITIONS.....................................       S-91
 
                         PROSPECTUS
REPORTS...........................................          2
ADDITIONAL INFORMATION............................          2
ADDITIONAL DETAILED INFORMATION...................          2
INCORPORATION OF CERTAIN INFORMATION BY
  REFERENCE.......................................          3
TABLE OF CONTENTS.................................          4
SUMMARY OF PROSPECTUS.............................          8
RISK FACTORS......................................         13
THE TRUST ESTATES.................................         15
THE SELLER........................................         19
NORWEST MORTGAGE..................................         19
NORWEST BANK......................................         20
THE MORTGAGE LOAN PROGRAMS........................         20
DESCRIPTION OF THE CERTIFICATES...................         30
PREPAYMENT AND YIELD CONSIDERATIONS...............         39
SERVICING OF THE MORTGAGE LOANS...................         41
CERTAIN MATTERS REGARDING THE MASTER SERVICER.....         52
THE POOLING AND SERVICING AGREEMENT...............         53
CERTAIN LEGAL ASPECTS OF THE MORTGAGE LOANS.......         59
CERTAIN FEDERAL INCOME TAX CONSEQUENCES...........         66
ERISA CONSIDERATIONS..............................         93
LEGAL INVESTMENT..................................         97
PLAN OF DISTRIBUTION..............................         98
USE OF PROCEEDS...................................         99
LEGAL MATTERS.....................................         99
RATING............................................         99
INDEX OF SIGNIFICANT DEFINITIONS..................        100
</TABLE>
 
                                      [LOGO]
 
                                  $149,180,900
                                 (APPROXIMATE)
 
                                 NORWEST ASSET
                             SECURITIES CORPORATION
                                   ("NASCOR")
                                     SELLER
 
                      MORTGAGE PASS-THROUGH CERTIFICATES,
                                 SERIES 1996-7
 
                            ------------------------
 
                             PROSPECTUS SUPPLEMENT
                              -------------------
 
                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION
 
                                October 24, 1996
 
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