NORWEST ASSET SECURTIES CORP
S-3/A, 1996-05-28
ASSET-BACKED SECURITIES
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<PAGE>
   
      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 28, 1996
    
 
                                                      REGISTRATION NO. 333-02209
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
   
                                 PRE-EFFECTIVE
                                AMENDMENT NO. 2
                                       TO
                                    FORM S-3
    
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
                      NORWEST ASSET SECURITIES CORPORATION
        (Exact name of registrant as specified in governing instruments)
 
                              5325 SPECTRUM DRIVE
                           FREDERICK, MARYLAND 21701
                                 (301) 846-8881
                    (Address of principal executive offices)
 
   
                          LAWRENCE D. RUBENSTEIN, ESQ.
                       VICE PRESIDENT AND GENERAL COUNSEL
                      NORWEST ASSET SECURITIES CORPORATION
                           C/O NORWEST MORTGAGE, INC.
                         343 THORNALL STREET, 5TH FLOOR
                            EDISON, NEW JERSEY 08837
                                 (908) 906-3909
                    (Name and address of agent for service)
    
                           --------------------------
                                   COPIES TO:
                            JORDAN M. SCHWARTZ, ESQ.
                         CADWALADER, WICKERSHAM & TAFT
                                100 MAIDEN LANE
                            NEW YORK, NEW YORK 10038
                                 (212) 504-6000
                           --------------------------
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
     FROM TIME TO TIME AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.
                           --------------------------
 
    If  the  only securities  being registered  on this  Form are  being offered
pursuant to dividend or interest reinvestment plans, please check the  following
box. / /
 
    If  any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to  Rule 415 under the Securities Act  of
1933, please check the following box. /X/
 
    If  this form  is filed  to register  additional securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration statement  number  of  the  earlier
effective registration statement for the same offering. / /
 
    If  this form  is a post-effective  amendment filed pursuant  to Rule 462(c)
under the Securities Act, please check the following box and list the Securities
Act  registration  statement  number  of  the  earlier  effective   registration
statement for the same offering. / /
 
    If  delivery of the prospectus is expected  to be made pursuant to Rule 434,
please check the following box. / /
                           --------------------------
                        CALCULATION OF REGISTRATION FEE
 
   
<TABLE>
<CAPTION>
                                                           PROPOSED MAXIMUM  PROPOSED MAXIMUM     AMOUNT OF
          TITLE OF SECURITIES                 AMOUNT        OFFERING PRICE      AGGREGATE        REGISTRATION
           BEING REGISTERED              BEING REGISTERED      PER UNIT       OFFERING PRICE         FEE
<S>                                      <C>               <C>               <C>               <C>
Mortgage Pass-Through Certificates.....   $5,000,000,000       100%(1)          $1,000,000     $1,724,137.93(2)
</TABLE>
    
 
(1) Estimated solely for purposes of calculating the registration fee.
 
   
(2) $344.83 previously paid.
    
                           --------------------------
 
    THE REGISTRANT HEREBY  AMENDS THIS  REGISTRATION STATEMENT ON  SUCH DATE  OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE  A  FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THE REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE  IN ACCORDANCE WITH SECTION 8(A)  OF
THE  SECURITIES ACT  OF 1933  OR UNTIL  THE REGISTRATION  STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION  8(A),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                      NORWEST ASSET SECURITIES CORPORATION
                             CROSS REFERENCE SHEET
 
<TABLE>
<CAPTION>
ITEM AND CAPTION IN FORM S-3                                                     LOCATION IN PROSPECTUS
- ----------------------------------------------------------------  -----------------------------------------------------
<C>        <S>                                                    <C>
       1.  Forepart of the Registration Statement and Outside
            Front Cover Page of Prospectus......................  Forepart of Registration Statement and Outside Front
                                                                   Cover
       2.  Inside Front Cover and Outside Back Cover Pages of
            Prospectus..........................................  Inside Front and Outside Back Cover Pages
       3.  Summary Information, Risk Factors and Ratio of
            Earnings to Fixed Charges...........................  Summary of Prospectus; Risk Factors and Special
                                                                   Considerations; Prepayment and Yield Considerations;
                                                                   Description of the Certificates
       4.  Use of Proceeds......................................  Use of Proceeds
       5.  Determination of Offering Price......................  *
       6.  Dilution.............................................  *
       7.  Selling Security Holders.............................  *
       8.  Plan of Distribution.................................  Cover Page; Plan of Distribution
       9.  Description of Securities to be Registered...........  Description of the Certificates
      10.  Interests of Named Experts and Counsel...............  *
      11.  Material Changes.....................................  *
      12.  Incorporation of Certain Information by Reference....  Incorporation of Certain Information by Reference
      13.  Disclosure of Commission Position on Indemnification
            for Securities Act Liabilities......................  *
</TABLE>
 
- ------------------------
*Omitted since answer is negative or item is not applicable.
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS PROSPECTUS SUPPLEMENT SHALL NOT  CONSTITUTE AN OFFER TO SELL OR
THE SOLICITATION  OF AN  OFFER TO  BUY  NOR SHALL  THERE BE  ANY SALE  OF  THESE
SECURITIES  IN ANY  STATE IN  WHICH SUCH  OFFER, SOLICITATION  OR SALE  WOULD BE
UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY
SUCH STATE.
<PAGE>
   
PROSPECTUS SUPPLEMENT, SUBJECT TO COMPLETION, DATED MAY 28, 1996
    
 
                              $      (APPROXIMATE)
 
                                     [LOGO]
                                     SELLER
                MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 199 -
    PRINCIPAL AND INTEREST PAYABLE MONTHLY, COMMENCING IN               199
                             ---------------------
 
    The Series  199 -  Mortgage  Pass-Through Certificates  (the "Series  199  -
Certificates")  will consist of two classes of senior certificates (the "Class A
Certificates" and the "Class AP  Certificates," respectively, and together,  the
"Senior  Certificates") and two classes of subordinated certificates (the "Class
M Certificates" and the "Class B Certificates," respectively, and together,  the
"Subordinated  Certificates"). The Senior 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  six subclasses of  Certificates designated as the
Class  A-1,  Class  A-2,  Class  A-3,  Class  A-4,  Class  A-5  and  Class   A-R
Certificates.  The Class AP  and 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, none of which is offered hereby. Each subclass of  Class
A  Certificates or Class B  Certificates is referred to  herein as a "Subclass."
The Class A Certificates, the Class AP Certificates and the Class M Certificates
are the only Series 199 - Certificates being offered hereby and are referred  to
herein collectively as the "Offered Certificates."
 
    The  Class A-1 Certificates are  planned amortization class certificates and
are referred to herein as the "PAC Certificates." The Class A-2 Certificates are
targeted amortization class certificates and are referred to herein as the  "TAC
Certificates."  The Class  A-3 Certificates  are companion  certificates and are
referred to herein as the "Companion Certificates."
                                                        (CONTINUED ON NEXT PAGE)
 
    PROSPECTIVE INVESTORS  IN  THE  OFFERED  CERTIFICATES  SHOULD  CONSIDER  THE
FACTORS  DISCUSSED UNDER  "RISK FACTORS" IN  THIS PROSPECTUS  SUPPLEMENT ON PAGE
S-  AND IN THE PROSPECTUS ON 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                                       INITIAL SUBCLASS OR
 SUBCLASS OR CLASS           CLASS          PASS-THROUGH   SUBCLASS OR CLASS           CLASS          PASS-THROUGH
    DESIGNATION      PRINCIPAL BALANCE (1)      RATE          DESIGNATION      PRINCIPAL BALANCE (1)      RATE
<S>                  <C>                    <C>           <C>                  <C>                    <C>
Class A-1..........       $                      %        Class A-5..........       $                      %
Class A-2..........       $                      %        Class A-R..........       $                      %
Class A-3..........       $                      %        Class AP...........       $                     (2)
Class A-4..........       $                      %        Class M............       $                      %
</TABLE>
 
(1) Approximate. The initial Subclass or Class Principal Balances are subject to
    adjustment as described herein.
(2)  The Class AP  Certificates are principal-only certificates  and will not be
    entitled to distributions in respect of interest.
 
    The  Offered   Certificates  will   be  purchased   by  [Underwriter]   (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   %  of the initial aggregate principal balance  of
the  Class A, Class AP  and Class M Certificates  plus accrued interest thereon,
other than on an amount equal to the initial aggregate principal balance of  the
Class AP Certificates, before deducting expenses payable by the Seller estimated
to be $       . The price to be paid to the Seller for the Class A, Class AP and
Class  M Certificates  has not been  allocated among  the Class A,  Class AP and
Class M  Certificates nor  among the  Subclasses of  Class A  Certificates.  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  certain
conditions.  It is expected that the  Offered Certificates will be available for
delivery through the facilities of The Depository Trust Company or, in the  case
of  the  Class  A-R,  Class AP  and  Class  M Certificates,  at  the  offices of
              , New  York,  New  York          ,  in  each  case,  on  or  about
              , 199 .
 
                                 [UNDERWRITER]
 
          THE DATE OF THIS PROSPECTUS SUPPLEMENT IS           , 199 .
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    The credit enhancement for the Series 199 - 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 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 199  - 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  of approximately     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, Inc. ("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 199 - Certificates  from Norwest Mortgage, and will have
been originated by Norwest Mortgage or acquired by Norwest Mortgage from various
entities (each, a "Correspondent"). The Mortgage Loans not originated by Norwest
Mortgage were originated by the Correspondents or acquired by the Correspondents
pursuant to mortgage loan purchase programs operated by such Correspondents. See
"Description of  the  Mortgage  Loans"  herein.  The  Senior  Certificates  will
initially evidence in the aggregate an approximate   % undivided interest in the
principal balance of the Mortgage Loans. The Class M Certificates will initially
evidence  in the aggregate an approximate    % interest in the principal balance
of the Mortgage Loans. The remaining approximate    % undivided interest in  the
principal  balance  of the  Mortgage  Loans will  be  evidenced by  the  Class B
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           199 , 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
AP  Certificates)  will be  reduced by  any  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 AP  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 Senior  Certificates have received  all amounts due  them
(other  than  the  Class AP  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 AP Certificates have received the Class AP 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 Senior Certificates and 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 AP
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 Senior  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  AP
Certificates,  the Class AP Deferred Amount)  and such Subclass 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
 
                                      S-2
<PAGE>
Certificates   in  the  manner  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 Classes or  Subclasses 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;
 
    - 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 AP 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 AP CERTIFICATES,  ON THE DISCOUNT  MORTGAGE
LOANS,  COULD RESULT IN AN ACTUAL YIELD THAT IS LOWER THAN ANTICIPATED. 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 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
AP  CERTIFICATES WILL BE  SENSITIVE TO THE  RATE OF PRINCIPAL  PAYMENTS OF THOSE
MORTGAGE LOANS WITH NET  MORTGAGE INTEREST RATES  LESS THAN    % (THE  "DISCOUNT
MORTGAGE LOANS"). THE YIELD TO MATURITY OF THE CLASS M CERTIFICATES WILL BE MORE
SENSITIVE THAN THE SENIOR 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. 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 WEIGHTED  AVERAGE LIFE  OF  THE COMPANION  CERTIFICATES WILL  BE  HIGHLY
SENSITIVE TO THE RATE OF PREPAYMENTS ON THE MORTGAGE LOANS. AT RATES AT OR ABOVE
CERTAIN  PREPAYMENT  LEVELS,  PAYMENTS OF  PRINCIPAL  ALLOCATED TO  THE  CLASS A
CERTIFICATES IN EXCESS OF AMOUNTS RESULTING FROM SUCH PREPAYMENT LEVELS WILL  BE
PAID  TO THE HOLDERS  OF THE COMPANION  CERTIFICATES PRIOR TO  BEING PAID TO THE
HOLDERS OF  THE  TAC CERTIFICATES  AND  THE  PAC CERTIFICATES,  RESULTING  IN  A
REDUCTION  IN THE  WEIGHTED AVERAGE  LIFE OF  THE COMPANION  CERTIFICATES. AT OR
BELOW CERTAIN  PREPAYMENT  LEVELS, THE  COMPANION  CERTIFICATES MAY  RECEIVE  NO
PRINCIPAL  PAYMENTS FOR EXTENDED  PERIODS OF TIME, RESULTING  IN AN EXTENSION OF
THE WEIGHTED AVERAGE  LIFE THEREOF.  SEE "PREPAYMENT  AND YIELD  CONSIDERATIONS"
HEREIN.
 
    The  Offered Certificates, other  than the Class  A-R, Class AP  and Class M
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>
    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
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 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 CERTIFICATE 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  and  Class  M
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.
 
    An election will be made to treat the Trust Estate as a real estate mortgage
investment conduit (the "REMIC") 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 AP, Class M, Class B-1, Class B-2, Class B-3,  Class
B-4  and Class B-5 Certificates will constitute "regular interests" in the REMIC
and the Class  A-R Certificate will  constitute the "residual  interest" in  the
REMIC.    PROSPECTIVE   INVESTORS    ARE   CAUTIONED   THAT    THE   CLASS   A-R
CERTIFICATEHOLDER'S REMIC TAXABLE INCOME AND  THE LIABILITY THEREON MAY  EXCEED,
AND  MAY SUBSTANTIALLY EXCEED, CASH DISTRIBUTIONS  TO SUCH HOLDER DURING CERTAIN
PERIODS, IN WHICH EVENT SUCH HOLDER 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 six Subclasses of a Class, and the  Class
AP  and Class M Certificates each represent a  Class, all of which are part of a
separate Series of  Certificates being  offered by  the Seller  pursuant to  the
Prospectus  dated                 , 199 accompanying this Prospectus Supplement.
Any prospective investor should not purchase any Offered Certificates  described
herein unless it has 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              , 199 , 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-7
Risk Factors..............................................................................................       S-27
  General.................................................................................................       S-27
  Subordination...........................................................................................       S-27
  Book-Entry System for Certain Classes and Subclasses of Certificates....................................       S-27
Description of the Certificates...........................................................................       S-28
  Denominations...........................................................................................       S-28
  Definitive Form.........................................................................................       S-28
  Book-Entry Form.........................................................................................       S-28
  Distributions...........................................................................................       S-28
  Interest................................................................................................       S-31
  Principal (Including Prepayments).......................................................................       S-35
    Calculation of Amount to be Distributed to the Class A Certificates...................................       S-35
    Calculation of Amount to be Distributed to the Class AP Certificates..................................       S-38
    Calculation of Amount to be Distributed to the Class M Certificates...................................       S-39
    Allocation of Amount to be Distributed................................................................       S-42
    Principal Payment Characteristics of the PAC Certificates, the TAC Certificates and the Companion
     Certificates.........................................................................................       S-43
  Example of Distribution to Certificateholders...........................................................       S-46
  Additional Rights of the Class A-R Certificateholder....................................................       S-47
  Periodic Advances.......................................................................................       S-47
  [Financial Security Assurance Inc.......................................................................       S-48]
  Restrictions on Transfer of the Class A-R and Class M Certificates......................................       S-50
  Reports.................................................................................................       S-51
  Subordination of Class M and Class B Certificates.......................................................       S-52
    Allocation of Losses..................................................................................       S-52
Description of the Mortgage Loans.........................................................................       S-57
  General.................................................................................................       S-57
  Mortgage Loan Data......................................................................................       S-59
  Mandatory Repurchase or Substitution of Mortgage Loans..................................................       S-63
  Optional Repurchase of Defaulted Mortgage Loans.........................................................       S-63
  Mortgage Underwriting Standards.........................................................................       S-63
Norwest Mortgage Delinquency and Foreclosure Experience...................................................       S-64
Prepayment and Yield Considerations.......................................................................       S-68
  Sensitivity of the Class AP Certificates................................................................       S-74
Pooling and Servicing Agreement...........................................................................       S-75
  General.................................................................................................       S-75
  Distributions...........................................................................................       S-76
  Voting..................................................................................................       S-76
  Trustee.................................................................................................       S-76
  Master Servicer.........................................................................................       S-77
  Optional Termination....................................................................................       S-77
Servicing of the Mortgage Loans...........................................................................       S-78
  The Servicers...........................................................................................       S-78
  Servicer Custodial Accounts.............................................................................       S-78
  Fixed Retained Yield; Servicing Compensation and Payment of Expenses....................................       S-79
</TABLE>
 
                                      S-5
<PAGE>
<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                            ---------
<S>                                                                                                         <C>
  Servicer Defaults.......................................................................................       S-80
Federal Income Tax Considerations.........................................................................       S-80
  Regular Certificates....................................................................................       S-80
  Residual Certificate....................................................................................       S-80
ERISA Considerations......................................................................................       S-82
Legal Investment..........................................................................................       S-83
Secondary Market..........................................................................................       S-83
Underwriting..............................................................................................       S-84
Legal Matters.............................................................................................       S-84
[Experts..................................................................................................       S-84]
Use of Proceeds...........................................................................................       S-84
Ratings...................................................................................................       S-85
Index of Significant Prospectus Supplement Definitions....................................................       S-86
</TABLE>
 
                                      S-6
<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 199
                                  -Certificates (the  "Series  199 -  Certificates"  or  the
                                  "Certificates").
Seller..........................  Norwest Asset Securities Corporation (the "Seller").
Participant.....................  Norwest  Mortgage, Inc. ("Norwest Mortgage"). The Mortgage
                                  Loans that  Norwest  Mortgage  sells to  the  Seller  will
                                  either   have  been  originated  by  Norwest  Mortgage  or
                                  acquired by Norwest Mortgage from various entities  (each,
                                  a  "Correspondent"), which either  originated the Mortgage
                                  Loans or acquired the Mortgage Loans pursuant to  mortgage
                                  loan  purchase  programs operated  by  the Correspondents.
                                  None of  the Correspondents  is  an affiliate  of  Norwest
                                  Mortgage.
Servicing/Servicers.............  Norwest  Mortgage and  one or more  other Servicers (which
                                  will be 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.  Servicers servicing more than   % of the Mortgage
                                  Loans by  Cut-Off  Date Aggregate  Principal  Balance  are
                                  Norwest  Mortgage and           . 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
                                  Distribution  Date that  is expressed as  one-twelfth of a
                                  fixed percentage  per annum  multiplied by  the  Scheduled
                                  Principal  Balance of such Mortgage  Loan on the first day
                                  of the  preceding Due  Period  and (ii)  other  additional
                                  servicing  compensation  described  herein.  The  weighted
                                  average of  the  Servicing Fee  Rates  is expected  to  be
                                  approximately    % as of  the Cut-Off Date. 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. 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  and  (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. The Master Servicer will be entitled to
                                  (i) a monthly  Master Servicing Fee  with respect to  each
                                  Mortgage  Loan, payable  on each Distribution  Date, in an
</TABLE>
 
                                      S-7
<PAGE>
 
<TABLE>
<S>                               <C>
                                  amount equal  to one-twelfth  of  a fixed  percentage  per
                                  annum  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  "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.........................  [Trustee], a national banking association (the  "Trustee")
                                  will,  in  addition  to performing  the  normal  duties of
                                  trustee with respect to  the Certificates, make  advances,
                                  to  the  extent  described  herein,  with  respect  to the
                                  Mortgage Loans if Norwest Mortgage, as Servicer, fails  to
                                  make a required advance. The Trustee will be entitled to a
                                  monthly  Trustee Fee  with respect to  each Mortgage Loan,
                                  payable on each Distribution Date,  in an amount equal  to
                                  one-twelfth  of a fixed percentage per annum multiplied by
                                  the Scheduled Principal Balance  of such Mortgage Loan  on
                                  the  first day  of the  preceding month.  See "Pooling and
                                  Servicing  Agreement  --   Trustee"  in  this   Prospectus
                                  Supplement.
Rating of Certificates..........  It  is  a  condition to  the  issuance of  the  Series 199
                                  - Certificates offered by  this Prospectus Supplement  and
                                  the  Prospectus that they shall have been rated [["Aaa" by
                                  Moody's Investors  Service,  Inc. ("Moody's")]  ["AAA"  by
                                  [Fitch  Investors Service, L.P.  ("Fitch")] [Duff & Phelps
                                  Credit Rating  Co. ("DCR")]]  [and] ["AAA"  and "AAAr"  by
                                  Standard and Poor's ("S&P")]] and [["Aa" by Moody's] ["AA"
                                  by  [Fitch] [DCR]  [S&P]] [and] ["A"  by [Moody's] [Fitch]
                                  [DCR] [S&P]] [and] [["Baa"  by Moody's] ["BBB" by  [Fitch]
                                  [DCR]  [S&P]. The ratings by [Moody's] [Fitch] [DCR] [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.  See   "--  Effects  of
                                  Prepayments  on   Investment   Expectations"   below   and
                                  "Ratings" in this Prospectus Supplement.
Description of Certificates.....  The  Series 199 - Certificates will consist of the Class A
                                  Certificates, the  Class  AP  Certificates,  the  Class  M
                                  Certificates and the Class B Certificates. The Class A and
                                  Class   AP  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  Prospectus as "Subordinated
                                  Certificates." As these  designations suggest, the  Senior
                                  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
                                  199 - 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.  See  "--
                                  Distributions of Principal and Interest" below.
                                  The  Senior  Certificates will  initially evidence  in the
                                  aggregate an approximate      % interest in the  principal
                                  balance  of the  Mortgage Loans. The  Class M Certificates
                                  will initially evidence
</TABLE>
 
                                      S-8
<PAGE>
 
<TABLE>
<S>                               <C>
                                  in the aggregate  an approximate       %  interest in  the
                                  principal  balance  of the  Mortgage Loans.  The remaining
                                  approximate     % interest in the principal balance of the
                                  Mortgage  Loans  will   be  evidenced  by   the  Class   B
                                  Certificates.  The Class AP  Certificates will evidence an
                                  interest in portions of the principal balances of Mortgage
                                  Loans that have Net Mortgage Interest Rates, as defined on
                                  page S-   ,  less  than        % (the  "Discount  Mortgage
                                  Loans"),  such  initial interest  in the  aggregate repre-
                                  senting an approximate     % interest by principal balance
                                  of  the  Mortgage  Loans  (the  "Pool  Balance  (Class  AP
                                  Portion)").  In addition,  the Class  AP Certificates will
                                  represent an approximate       % initial  interest in  the
                                  principal  balance  of  the  Discount  Mortgage  Loans. By
                                  virtue of the  subordination of  the Class M  and Class  B
                                  Certificates,   it   is   possible  that   the   Class  AP
                                  Certificates  may  also   receive  support  from   certain
                                  payments  made with respect to the other Mortgage Loans in
                                  the Trust  Estate.  The  Class  A, Class  M  and  Class  B
                                  Certificates  will evidence the  entire remaining interest
                                  in the principal balance of the Mortgage Loans (the  "Pool
                                  Balance  (Classes A/M/B Portion)"). Initially, the Class A
                                  Certificates will evidence in the aggregate an approximate
                                      % (approximately $        ) undivided interest in  the
                                  initial  Pool Balance (Classes A/M/B Portion); the Class M
                                  Certificates will evidence in the aggregate an approximate
                                      % (approximately $        ) undivided interest in  the
                                  initial  Pool  Balance  (Classes A/M/B  Portion);  and the
                                  Class B Certificates will evidence in the aggregate an ap-
                                  proximate     % (approximately $        ) undivided inter-
                                  est in the initial  Pool Balance (Classes A/M/B  Portion).
                                  The   relative  interests  in  the  initial  Pool  Balance
                                  (Classes A/M/B Portion) represented by the Class A,  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
                                  for a  specified  period  and the  allocation  of  certain
                                  losses  and  certain  shortfalls  first  to  the  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.
                                  The Class A  Certificates will consist  of six  Subclasses
                                  designated  as the Class A-1,  Class A-2, Class A-3, Class
                                  A-4, Class A-5  and Class A-R  Certificates. The Class  AP
                                  Certificates  are a separate class  and are not a Subclass
                                  of the  Class A  Certificates. The  Class AP  and 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 which  are  not  offered
                                  hereby  and may  be retained  or sold  by the  Seller. The
                                  Class A Certificates,  the Class AP  Certificates and  the
                                  Class  M Certificates  are referred to  in this Prospectus
                                  Supplement as the "Offered Certificates."
                                  The Class A-1 Certificates are planned amortization  class
                                  certificates    (referred   to   herein    as   the   "PAC
                                  Certificates")  because,  based  on  certain   assumptions
                                  described in the   paragraph on
</TABLE>
 
                                      S-9
<PAGE>
 
<TABLE>
<S>                               <C>
                                  page  S-  , if prepayments  on the Mortgage Loans occur at
                                  any constant rate  between approximately        % SPA  (as
                                  defined herein under "Prepayment and Yield
                                  Considerations")  and  approximately        %  SPA,  it is
                                  expected that their principal balances would be reduced to
                                  the  percentages  of  their  initial  principal   balances
                                  indicated  in  the  tables  on  page     .  The  Class A-2
                                  Certificates are targeted amortization class  certificates
                                  (referred  to herein  as the  "TAC Certificates") because,
                                  based on certain assumptions described in the paragraph on
                                  page S-  , at a constant prepayment level of approximately
                                      % SPA, it  is expected that  their principal  balances
                                  would  be  reduced  to the  percentages  of  their initial
                                  principal balances indicated  in the  tables on page     .
                                  However,  it is highly unlikely that principal prepayments
                                  on the Mortgage Loans will  occur at any constant rate  or
                                  that  the Mortgage Loans will prepay at the same rate. The
                                  Class  A-3   Certificates   are   companion   certificates
                                  (referred  to  herein  as  the  "Companion  Certificates")
                                  because payments  of principal  allocated to  the Class  A
                                  Certificates  in excess of  amounts resulting from certain
                                  prepayment levels will be paid first to the holders of the
                                  Companion Certificates for  so long  as such  Certificates
                                  remain  outstanding, prior to being paid to the holders of
                                  the  TAC  Certificates  and  the  PAC  Certificates.   See
                                  "Description  of the Certificates  -- Principal (Including
                                  Prepayments) -- Allocation  of Amount  to be  Distributed"
                                  and  "--  Principal  Payment  Characteristics  of  the PAC
                                  Certificates,  the  TAC  Certificates  and  the  Companion
                                  Certificates" in this Prospectus Supplement.
                                  The  Offered Certificates  have the  approximate aggregate
                                  initial principal balances set forth on the cover of  this
                                  Prospectus   Supplement.   Any   difference   between  the
                                  aggregate principal balance of the  Class A, Class AP  and
                                  Class  M Certificates  as of the  date of  issuance of the
                                  Series 199  -   Certificates and  the approximate  initial
                                  aggregate principal balance of such Subclasses and Classes
                                  as  of the  date of  this Prospectus  Supplement will not,
                                  with respect to the Senior Certificates, exceed 5% of  the
                                  initial  aggregate principal  balance of  the Class  A and
                                  Class AP  Certificates  as stated  on  the cover  of  this
                                  Prospectus  Supplement and,  with respect  to the  Class M
                                  Certificates,  will  depend  on  the  final  subordination
                                  levels  for the Series 199 -  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-R Certificate, and to the Class AP
                                  Certificates.
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>
 
                                      S-10
<PAGE>
                 FORM AND DENOMINATIONS OF OFFERED CERTIFICATES
 
<TABLE>
<CAPTION>
                                                             ORIGINAL CERTIFICATE       MINIMUM      INCREMENTAL
                         SUBCLASS                                    FORM            DENOMINATION   DENOMINATION
- ----------------------------------------------------------  -----------------------  -------------  -------------
<S>                                                         <C>                      <C>            <C>
Classes A-1, A-2, A-3, A-4 and A-5........................  Book-Entry                $   100,000     $   1,000
Class A-R.................................................  Definitive                $                     N/A
Class AP..................................................  Definitive                $   100,000     $       1
Class M...................................................  Definitive                $   100,000     $   1,000
</TABLE>
 
- ------------------------
    In  order to aggregate the original  principal balance of such Subclass, one
    certificate will be  issued with  an incremental denomination  of less  than
    that shown.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                 <C>
                                    BOOK-ENTRY  FORM. The  Offered Certificates,  other than
                                    the Class A-R, Class AP  and Class M 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 participating organizations. See "Description of
                                    the Certificates  -- Denominations"  and "--  Book-Entry
                                    Form"  in this Prospectus Supplement and "Description of
                                    the Certificates -- Book-Entry Form" in the Prospectus.
                                    DEFINITIVE FORM. The  Class A-R,  Class AP  and Class  M
                                    Certificates   will   each  be   issued   as  Definitive
                                    Certificates. See  "Description of  the Certificates  --
                                    Denominations"   and  "--   Definitive  Form"   in  this
                                    Prospectus   Supplement   and   "Description   of    the
                                    Certificates -- Definitive Form" in the Prospectus.
Mortgage Loans....................  MORTGAGE  LOAN DATA.  The Mortgage Loans,  which are the
                                    source of distributions to holders  of the Series 199  -
                                     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  of  approximately
                                    years,  which may include loans secured by shares issued
                                    by cooperative housing corporations. 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(2)
(AS OF THE CUT-OFF DATE)
 
<TABLE>
<S>                                                                  <C>
Cut-Off Date:                                                                         1, 199
Number of Mortgage Loans:
Aggregate Unpaid Principal Balance(1)                                $
Range of Unpaid Principal Balances(1):                               $                  to $
Average Unpaid Principal Balance(1):                                 $
Range of Mortgage Interest Rates:                                                   % to   %
Weighted Average Mortgage Interest Rate(1):                                                %
Range of Remaining Terms to Stated Maturity:                              months to   months
Weighted Average Remaining Term to Stated Maturity(1):                                months
Range of Original Loan-to-Value Ratios(1):                                          % to   %
Weighted Average Original Loan-to-Value Ratio(1):                                          %
Geographic Concentration of Mortgaged Properties
 Securing Mortgage Loans in Excess of 5% of the
 Aggregate Unpaid Principal Balance(1):                              [States]   %
 
Maximum Five-Digit Zip Code Concentration(1):                                              %
</TABLE>
 
- ------------------------
(1) Approximate.
 
(2) Information concerning  the  Discount  Mortgage Loans  is  set  forth  under
    "Description of the Mortgage Loans -- General."
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
                                  CHANGES  TO  POOL.   A  number  of 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 199 - Certificates (which  is expected to occur  on
                                  or  about             , 199 ) (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
                                  199  - 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
                                  "Description of  the Mortgage  Loans" in  this  Prospectus
                                  Supplement.
                                  Subsequent   to   the   issuance   of   the   Series   199
                                  - Certificates, certain Mortgage Loans may be removed from
                                  the pool through
</TABLE>
 
                                      S-12
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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............  Norwest   Mortgage   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 199
                                  - Certificates. See  "Pooling and  Servicing Agreement  --
                                  Optional Termination" in this Prospectus Supplement.
Underwriting Standards..........  Approximately      % (by Cut-Off  Date Aggregate Principal
                                  Balance) of  the  Mortgage Loans  (the  "Norwest  Mortgage
                                  Underwritten   Loans")   were   generally   originated  in
                                  conformity with Norwest Mortgage's underwriting  standards
                                  applied either by Norwest Mortgage or by Correspondents to
                                  whom  Norwest  Mortgage  had  delegated  all  underwriting
                                  functions. In  certain  instances, exceptions  to  Norwest
                                  Mortgage's underwriting standards may have been granted by
                                  Norwest Mortgage to such Correspondents. See "The Mortgage
                                  Loan  Programs  --  Mortgage  Loan  Underwriting"  in  the
                                  Prospectus. Approximately    % and     % (by Cut-Off  Date
                                  Aggregate  Principal Balance)  of the  Mortgage Loans (the
                                  "Pool Certification  Underwritten Loans")  will have  been
                                  reviewed    by   General   Electric   Mortgage   Insurance
                                  Corporation ("GEMICO")  and  United  Guaranty  Residential
                                  Insurance   Company  ("UGRIC"),  respectively,  to  ensure
                                  compliance with  their  respective credit,  appraisal  and
                                  underwriting    standards.   Neither    the   Series   199
                                  - Certificates  nor  the  Mortgage Loans  are  insured  or
                                  guaranteed  under a mortgage  pool insurance policy issued
                                  by GEMICO or UGRIC.  [The Pool Certification  Underwritten
                                  Loans  were  evaluated  by Norwest  Mortgage  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  by Norwest  Mortgage. The  remaining
                                  approximate       % (by  Cut-Off Date  Aggregate Principal
                                  Balance)  of  the  Mortgage  Loans  (the  "Bulk   Purchase
                                  Underwritten  Loans") were  purchased by  Norwest Mortgage
                                  from one  or  more Correspondents  and  were  underwritten
                                  using  underwriting standards which  may vary from Norwest
                                  Mortgage's  underwriting   standards.   However,   Norwest
                                  Mortgage  has  in  each  case  reviewed  the  underwriting
                                  standards applied and determined  that such variances  did
                                  not depart materially from Norwest Mortgage's underwriting
                                  standards.]  See  "Description  of the  Mortgage  Loans --
                                  Mortgage
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                                      S-13
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<S>                               <C>
                                  Underwriting Standards" in this Prospectus Supplement  and
                                  "The Mortgage Loan Programs -- Mortgage Loan Underwriting"
                                  in the Prospectus.
Distributions of Principal and
 Interest.......................  DISTRIBUTIONS  IN  GENERAL.   Distributions on  the Series
                                  199 - 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    199 ,  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 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 and Class
                                  AP Certificates will  be entitled to  receive all  amounts
                                  due  them  (other than  the Class  AP Deferred  Amount, as
                                  defined on page S-  ) before any distributions are made to
                                  holders of the Class  M and Class  B Certificates on  that
                                  Distribution  Date.  The  Class  AP  Certificates  will be
                                  entitled to  receive  the  Class  AP  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
                                  the  Class  A  Certificates,  to  reduce  the  outstanding
                                  principal  balances   of  the   Class  A   and  Class   AP
                                  Certificates. The likelihood that a holder of a particular
                                  Subclass  of Class  A 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 heading "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" in this Prospectus Supplement.
                                  After  all  amounts  due  on  the  Class  A  and  Class AP
                                  Certificates (other  than the  Class AP  Deferred  Amount)
                                  have  been paid, the amount remaining will be distributed,
                                  in the following order, to  (i) pay any Class AP  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)  pay interest  due to the
                                  holders of the Class  M Certificates, (iii) pay  principal
                                  due to the holders of the Class M
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                                      S-14
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<S>                               <C>
                                  Certificates  less any  amounts used  to pay  the Class AP
                                  Deferred Amount and (iv) pay 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   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  AP
                                  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 Trustee 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 Class or Subclass of Offered Certificates,
                                  other than  the Class  AP Certificates,  will be  entitled
                                  each   month  is  calculated   based  on  the  outstanding
                                  principal balance of  such Class  or Subclass,  as of  the
                                  related Distribution Date. Interest will accrue each month
                                  on  each such Class or Subclass according to the following
                                  formula: 1/12th of the Pass-Through Rate for such Class or
                                  Subclass multiplied by  the outstanding principal  balance
                                  of  such Class or Subclass  as of the related Distribution
                                  Date. Holders of  the Class  AP Certificates  will not  be
                                  entitled   to  receive  distributions   of  interest.  The
                                  "Pass-Through Rate" for each Class and Subclass of Offered
                                  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
                                  Servicer and  the nature  of the  event resulting  in  the
                                  interest shortfall.
                                  In   the  case  of  principal   prepayments  IN  FULL  the
                                  respective Servicer will be  obligated to cover  resulting
                                  interest   shortfalls  up  to   the  aggregate  amount  of
                                  Servicing Fees  payable  thereunder on  such  Distribution
                                  Date   to  the   related  Servicer.   Interest  shortfalls
                                  resulting from  partial  principal  prepayments  occurring
                                  with  respect  to Mortgage  Loans  will not  be  offset by
                                  Servicing Fees, but  instead will  be borne  first by  the
                                  Class B Certificates and then by the Class A Certificates.
                                  See  "Description of the  Certificates -- Subordination of
                                  the Class B Certificates"  in this Prospectus  Supplement.
                                  Shortfalls in
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                                      S-15
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<S>                               <C>
                                  collections   of   interest   resulting   from   principal
                                  prepayments  in  full,  to  the  extent  they  exceed  the
                                  aggregate amount of Servicing Fees payable with respect to
                                  a    Distribution   Date    to   the    related   Servicer
                                  ("Non-Supported Interest Shortfalls"),  will be  allocated
                                  pro   rata  among  the   Classes  of  the   Series  199  -
                                   Certificates (other than the Class AP Certificates) based
                                  on their then-outstanding principal  balances and will  be
                                  allocated  pro  rata  among  the  Subclasses  of  Class  A
                                  Certificates based on interest accrued.
                                  In  addition,  the  amount  of  interest  required  to  be
                                  distributed  to holders  of the Series  199 - 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
                                  pro  rata in accordance with their respective entitlements
                                  to interest and the amount of any deficiency will be added
                                  to the amount  of interest that  the 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 and Class AP Certificates (other than any
                                  Class AP Deferred Amount)  has been made, is  insufficient
                                  to  permit distribution in full of accrued interest on the
                                  Class M Certificates  (net of  any 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.
                                  Interest  on  the  Class   A  Certificates  and  Class   M
                                  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
                                  are entitled  each  month  will equal  the  sum  for  each
                                  Mortgage  Loan  of the  product of  (a) the  Classes A/M/B
                                  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
</TABLE>
 
                                      S-16
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<S>                               <C>
                                  Percentage") of certain unscheduled payments of  principal
                                  on  each Mortgage Loan. The  "Classes A/M/B Fraction" with
                                  respect to any Mortgage Loan will equal the lesser of  (a)
                                  1.0  and  (b)  the  Net Mortgage  Interest  Rate  for such
                                  Mortgage Loan divided by    %. 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 to the Pool Balance (Classes A/M/B  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 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  Certificates  -- Principal
                                  (Including Prepayments)  -- Calculation  of Amount  to  be
                                  Distributed   to  the   Class  A   Certificates"  in  this
                                  Prospectus Supplement, until the ninth anniversary of  the
                                  first  Distribution  Date and  thereafter  it is  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 Classes A/M/B  Fraction of such Mortgage
                                  Loan equal,  in each  case, to  100% less  the  applicable
                                  percentage for the Class A Certificates described above.
                                  The  aggregate amount of principal to which holders of the
                                  Class AP Certificates are  entitled each month will  equal
                                  the  sum for each Discount Mortgage Loan of the product of
                                  (a) the Class AP 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. In addition, the Class AP
                                  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 AP  Deferred Amount.  The "Class  AP Fraction"  with
                                  respect  to  any  Discount Mortgage  Loan  will  equal the
                                  difference between 1.0 and the Classes A/M/B Fraction  for
                                  such  Discount Mortgage  Loan. The Class  AP 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 AP  Certificates will  also be
                                  entitled each month  to an  amount equal to  the Class  AP
                                  Deferred Amount. The Class AP Deferred Amount will be paid
                                  to  holders of the Class AP Certificates only from amounts
                                  otherwise
</TABLE>
 
                                      S-17
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<TABLE>
<S>                               <C>
                                  distributable   as   principal    to   the    Subordinated
                                  Certificates.  The Class  AP Deferred Amount  will be paid
                                  first 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 AP Deferred Amount.
                                  Except  as   described   below   under   "--   Effect   of
                                  Subordination  Level on Principal  Distributions," on each
                                  Distribution  Date,  the  Class  M  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  Certificates to  the  then-outstanding principal
                                  balance of the Subordinated Certificates.
                                  The amount  that  is  available for  distribution  to  the
                                  holders  of the Class  A and Class  AP Certificates on any
                                  Distribution Date as  a distribution  of principal  (other
                                  than  any Class AP Deferred Amount) is equal to the amount
                                  remaining  after   deducting   the  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  199   -  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,   all  principal
                                  distributions on the Class AP Certificates (including  any
                                  Class  AP 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 199 - 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 balance 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, Class  M and Class  B Certificates  is less than
                                  such percentage  was  upon  the initial  issuance  of  the
                                  Series    199   -   Certificates,   then   the   Class   B
</TABLE>
 
                                      S-18
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<S>                               <C>
                                  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   then-outstanding
                                  principal   balances   of  the   Subclasses  of   Class  B
                                  Certificates with higher numerical designations by the sum
                                  of the then-outstanding principal balances of the Class A,
                                  Class M  and  Class  B  Certificates  is  less  than  such
                                  percentage  at  the time  of the  initial issuance  of the
                                  Series 199 -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  any  such case,  the  Class M  Certificates  and those
                                  Subclasses of Class  B Certificates  with lower  numerical
                                  designation  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  designation 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 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 Senior  Certificates  to  receive
                                  distributions,  to the extent described herein. The rights
                                  of the  holders of  the Class  B Certificates  to  receive
                                  distributions  will be  subordinated to the  rights of the
                                  holders  of  the  Senior  Certificates  and  the  Class  M
                                  Certificates  to  receive  distributions,  to  the  extent
                                  described herein.  This subordination  provides a  certain
                                  amount   of  protection  to  the  holders  of  the  Senior
                                  Certificates (to the  extent of the  subordination of  the
                                  Class  M  and  Class  B  Certificates)  and  the  Class  M
                                  Certificates (to the  extent of the  subordination of  the
                                  Class  B Certificates)  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
                                  Senior Certificates by means of this subordination will be
                                  effected in two ways: (i) by the preferential right of the
                                  holders of the  Senior Certificates to  receive, prior  to
                                  any distribution being
</TABLE>
 
                                      S-19
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<S>                               <C>
                                  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 and
                                  the amount of principal  due the holders  of the Class  AP
                                  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 M and  Class B Certificates and
                                  (ii) by  the  allocation  to  the  Class  M  and  Class  B
                                  Certificates,  until  their respective  principal balances
                                  are 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   Senior   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  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
                                  Senior   Certificates,   a   disproportionate   amount  of
                                  prepayments  and  certain   unscheduled  recoveries   with
                                  respect  to the  Mortgage Loans  will be  allocated to the
                                  Class A Certificates.  This allocation has  the effect  of
                                  accelerating  the amortization of the Class A Certificates
                                  while,  in  the  absence  of  losses  in  respect  of  the
                                  liquidation   of  defaulted   Mortgage  Loans   or  losses
                                  resulting from  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.
                                  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 Senior
</TABLE>
 
                                      S-20
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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  $      )  has been reduced to zero and 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 $      ) has been reduced to
                                  zero. 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   and  Class  B
                                  Certificates will be  affected by the  prior reduction  of
                                  the principal balance of the Class M Certificates and such
                                  Subclasses  of  Class  B  Certificates.  Reduction  of the
                                  principal balance of the Class M and 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   199
                                  -  Certificates,  the  amount  of  losses  attributable to
                                  special  hazards,  fraud  and  bankruptcy  that  will   be
                                  absorbed solely by the holders of the Class B Certificates
                                  and then solely by the holders of the Class M Certificates
                                  will  be approximately    %,     % and    %, respectively,
                                  of the  Cut-Off Date  Aggregate Principal  Balance of  the
                                  Mortgage  Loans (approximately  $     , $      and $     ,
                                  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, Class M
                                  and Subclasses of  Class B  Certificates and  (ii) to  the
                                  extent such losses arise with respect to Discount Mortgage
                                  Loans,  the Class AP 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 AP Certificates, if any) will be allocated to
                                  the  Class A Certificates. To the extent such losses arise
                                  with respect to Discount
</TABLE>
 
                                      S-21
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Mortgage Loans,  such losses  will be  shared between  the
                                  Class  A  and Class  AP  Certificates, according  to their
                                  respective interests in such Mortgage Loans. The  interest
                                  portion  of  such  losses will  be  borne by  the  Class A
                                  Certificates. Any losses borne by the Class A Certificates
                                  will be  shared pro  rata  by the  Subclasses of  Class  A
                                  Certificates  based  on  their  then-outstanding principal
                                  balances with  respect to  the principal  portion of  such
                                  losses,  and based on their accrued interest, with respect
                                  to the interest portion  of such losses. See  "Description
                                  of  the Certificates -- Interest" and "-- Subordination of
                                  Class M and Class B Certificates -- Allocation of  Losses"
                                  in this Prospectus Supplement.
                                  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 THE SENIOR
                                  CERTIFICATES, IN THE  EVENT THAT  THE AGGREGATE  PRINCIPAL
                                  BALANCE  OF THE CLASS  B CERTIFICATES HAS  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
 Investment 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 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 the 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 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,
</TABLE>
 
                                      S-22
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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  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 AP  Certificates, which  do  not bear  interest,  is
                                  solely  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
                                  AP  Certificates is  displayed in a  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
                                  AP 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   AP
                                  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 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 AP  CERTIFICATES WILL BE INFLUENCED BY
                                  PRINCIPAL PAYMENTS  SOLELY WITH  RESPECT TO  THE  DISCOUNT
                                  MORTGAGE LOANS.
                                  REINVESTMENT  RISK.    As  stated  above,  if  an  Offered
                                  Certificate is purchased at an amount equal to its  unpaid
                                  principal balance (that is, 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 AP  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.
                                  Consequently,  the  amount   of  principal   distributions
                                  available  to  an 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
</TABLE>
 
                                      S-23
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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  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. 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  AP 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  LIFE OF  THE COMPANION CERTIFICATES
                                  WILL BE HIGHLY SENSITIVE TO THE RATE OF PREPAYMENTS ON THE
                                  MORTGAGE LOANS  AT RATES  AT OR  ABOVE CERTAIN  PREPAYMENT
                                  LEVELS  BECAUSE  PAYMENTS  OF PRINCIPAL  ALLOCATED  TO THE
                                  CLASS A CERTIFICATES IN  EXCESS OF SUCH PREPAYMENT  LEVELS
                                  WILL  BE PAID TO THE HOLDERS OF THE COMPANION CERTIFICATES
                                  WHILE SUCH CERTIFICATES REMAIN OUTSTANDING PRIOR TO  BEING
                                  PAID  TO THE HOLDERS  OF THE TAC  CERTIFICATES AND THE PAC
                                  CERTIFICATES.
                                  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.
                                  See   "Description  of   the  Certificates   --  Principal
                                  (Including Prepayments)  --  Allocation of  Amount  to  be
                                  Distributed"  and "-- Principal Payment Characteristics of
                                  the  PAC  Certificates,  the  TAC  Certificates  and   the
                                  Companion Certificates" in this Prospectus Supplement.
Federal Income Tax Status.......  An  election will be  made to treat the  Trust Estate as a
                                  real estate mortgage investment conduit (the "REMIC")  for
                                  federal  income tax  purposes. The  Class A-1,  Class A-2,
                                  Class A-3, Class A-4 and Class A-5 Certificates, the Class
                                  AP 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
                                  REMIC  and the  Class A-R Certificate  will constitute the
                                  "residual interest" in the REMIC.
                                  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.   The   Class         Certificates   will   be
</TABLE>
 
                                      S-24
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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
                                  Certificates  will be issued  with original issue discount
                                  in  an  amount  equal  to  the  excess  of  their  initial
                                  principal  balances  (plus      days  of  interest  at the
                                  pass-through rates  thereon) over  their respective  issue
                                  prices. It is also anticipated that the Class A- and Class
                                  A-  Certificates will be issued at  a premium and that the
                                  Class
                                  Certificates will be issued with DE MINIMIS original issue
                                  discount for federal  income tax purposes.  It is  further
                                  anticipated  that  the Class  B-1,  Class B-2,  Class B-3,
                                  Class B-4 and Class B-5  Certificates will be issued  with
                                  original issue discount for federal income tax purposes.
                                  The  holder of the Class  A-R Certificate will be required
                                  to include  the taxable  income or  loss of  the REMIC  in
                                  determining  its federal taxable income. It is anticipated
                                  that all or a substantial portion of the taxable income of
                                  the REMIC includible  by the  Class A-R  Certificateholder
                                  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
                                  CERTIFICATE MAY BE SIGNIFICANTLY  LOWER THAN WOULD BE  THE
                                  CASE  IF THE  CLASS A-R CERTIFICATE  WERE TAXED  AS A DEBT
                                  INSTRUMENT,  OR  MAY  BE  NEGATIVE.  FURTHER,  SIGNIFICANT
                                  RESTRICTIONS  APPLY  TO  THE  TRANSFER  OF  THE  CLASS A-R
                                  CERTIFICATE. THE CLASS A-R CERTIFICATE WILL BE  CONSIDERED
                                  A  "NONECONOMIC RESIDUAL  INTEREST," 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 and Class  M 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 CERTIFICATES ARE SUBORDINATED  TO
                                  THE  SENIOR CERTIFICATES, THE CLASS M CERTIFICATES MAY NOT
                                  BE TRANSFERRED UNLESS THE  TRANSFEREE HAS DELIVERED (I)  A
                                  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  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.
</TABLE>
 
                                      S-25
<PAGE>
 
<TABLE>
<S>                               <C>
                                  THE  CLASS  A-R CERTIFICATE  MAY  NOT BE  PURCHASED  BY OR
                                  TRANSFERRED TO A PLAN. See "ERISA Considerations" in  this
                                  Prospectus Supplement and in the Prospectus.
Legal Investment................  [The   Offered  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 Offered
                                  Certificates are legal investments for certain entities to
                                  the extent  provided  in  such  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 rated securities.] [The Offered Certificates will
                                  not  constitute  "mortgage related  securities"  under the
                                  Secondary Mortgage  Market Enhancement  Act of  1984  (the
                                  "Enhancement  Act").  The appropriate  characterization of
                                  the Offered  Certificates under  various legal  investment
                                  restrictions, and thus the ability of investors subject to
                                  these  restrictions to purchase  Offered Certificates, may
                                  be subject to significant interpretive 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  Offered
                                  Certificates will constitute legal investments for  them.]
                                  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 Investment"  in this  Prospectus
                                  Supplement.
</TABLE>
 
                                      S-26
<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 AP 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 by  Norwest Mortgage  of Mortgage  Loans as  a result  of  defective
documentation   or  by  the  appropriate  Representing  Party  for  breaches  of
representations and warranties,  optional purchase  by the  Seller of  defaulted
Mortgage  Loans and optional purchase by Norwest Mortgage 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 AP 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 AP 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 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 Senior Certificates and  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 Senior  Certificates and the Class M Certificates,
all to the  extent described herein  under "Description of  the Certificates  --
Subordination of Class M and Class B Certificates."
 
BOOK-ENTRY SYSTEM FOR CERTAIN CLASSES AND SUBCLASSES OF CERTIFICATES
 
    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 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 and Special Considerations --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-27
<PAGE>
                        DESCRIPTION OF THE CERTIFICATES
 
DENOMINATIONS
 
    The   Offered  Certificates,  other   than  the  Class   A-R  and  Class  AP
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. The Class A-R Certificate will be issued as a single Certificate
with a  denomination of  $           initial  principal  balance. The  Class  AP
Certificates  will  be  issued  in  minimum  denominations  of  $100,000 initial
principal balance  and integral  multiples of  $1 initial  principal balance  in
excess  thereof, except that one  of the Class AP  Certificates may be issued in
any denomination in excess of $100,000 initial principal balance.
 
DEFINITIVE FORM
 
    Offered Certificates  issued  in  fully registered,  certificated  form  are
referred  to herein  as "Definitive Certificates."  The Class A-R,  Class AP and
Class M Certificates will be issued as Definitive Certificates. Distributions of
principal of, and interest on, the  Definitive Certificates will be made by  the
Trustee  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 Trustee or other certificate registrar. No service charge will be imposed
for any  registration of  transfer  or exchange,  but  the Trustee  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 the Class A, Class AP, Class M and Class B Certificates will be made monthly,
to the extent of each Subclass' 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           199 . With respect  to
the Class A Certificates, such distributions will be made, to the extent of each
Subclass's  entitlement thereto,  in an  aggregate amount  equal to  the Class A
Distribution  Amount.  With   respect  to  the   Class  AP  Certificates,   such
distributions  will  be  made,  to  the extent  of  the  Class  AP Certificates'
entitlement thereto, on each Distribution Date  in an amount equal to the  Class
AP Principal Distribution Amount after all amounts in respect of interest due on
the  Class A  Certificates for such  Distribution Date  including all previously
unpaid Class A Subclass Interest Shortfall Amounts with respect to any  Subclass
of   Class  A  Certificates  have  been  paid.  With  respect  to  the  Class  M
Certificates, such distributions  will be  made, to the  extent of  the Class  M
Certificates'  entitlement thereto,  on each  Distribution Date  in an aggregate
amount equal to the Class M Distribution Amount after all amounts in respect  of
interest  and principal due on the Class A Certificates and principal due on the
Class AP
 
                                      S-28
<PAGE>
Certificates for such Distribution Date including all previously unpaid Class  A
Subclass  Interest Shortfall  Amounts with  respect to  any Subclass  of Class A
Certificates have been paid. See  "Description of the Certificates --  Interest"
herein.  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 Trustee 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 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 (net of related servicing, master servicing and trustee fees) 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) 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 as adjusted in respect
    of Prepayment Interest Shortfalls  and, if applicable, Curtailment  Interest
    Shortfalls  as described under "Description of the Certificates -- Interest"
    below, (ii) the  Master Servicer  Fee, (iii) the  Trustee Fee  and (iv)  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, partial principal prepayments and
    Partial  Liquidation Proceeds received  by the related  Servicer on or after
    the Determination Date  occurring in  the month in  which such  Distribution
    Date occurs, and all related payments of interest on such amounts;
 
        (f) 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, Master Servicer Fee
    or Trustee Fees to which such Servicer, the Master Servicer or the  Trustee,
    respectively,  is entitled, or which represents unpaid Fixed Retained Yield,
    and  the  portion  of  net  Liquidation  Proceeds  used  to  reimburse   any
    unreimbursed Periodic Advances;
 
        (g) 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;
 
                                      S-29
<PAGE>
        (h) reinvestment  earnings  on  payments  received  in  respect  of  the
    Mortgage Loans or on other amounts on deposit in the Certificate Account;
 
        (i) Net Foreclosure Profits; and
 
         (j)  the amount  of any  recoveries in  respect of  principal which had
    previously been allocated as a loss to one or more Classes or Subclasses  of
    the Certificates.
 
    The "Remittance Date" with respect to any Distribution Date will be the 18th
day  of each month, or if any day  is not a business day, the preceding business
day.
 
    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 Trustee 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 Trustee 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, 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, 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, to  the Class  A and  Class AP  Certificates pro  rata,
based on their respective class optimal principal amounts, (A) to the Subclasses
of  Class  A Certificates,  in an  aggregate amount  up to  the Class  A 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  to  the  Class  A
Certificates"  and (B) to the Class AP Certificates in an amount up to the Class
AP Optimal Principal Amount;
 
    FOURTH, to  the Class  AP  Certificates in  an amount  up  to the  Class  AP
Deferred  Amount, but only, first  from amounts otherwise distributable (without
regard to this priority) to the  Subclasses of Class B Certificates pursuant  to
priority  EIGHTH clause (C) 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;
 
    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  AP
Deferred Amount in accordance with priority FOURTH; and
 
    EIGHTH,  sequentially, to the Class B-1, Class B-2, 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
 
                                      S-30
<PAGE>
interest shortfall amount and (C) finally, an amount up to its 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 EIGHTH 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 AP
Deferred Amount in accordance with priority FOURTH.
 
    The "Class A 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 undivided percentage interest (the "Percentage Interest") represented by
any Offered Certificate  of a  Subclass or any  Class in  distributions to  such
Subclass  or Class  will be  equal to  the percentage  obtained by  dividing the
initial principal balance of such Certificate by the aggregate initial principal
balance of all Certificates of such Subclass or Class, as the case may be.
 
INTEREST
 
    The amount  of  interest  that will  accrue  on  each Subclass  of  Class  A
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 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 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 Offered Certificates (the "Pass-Through Rate") is the
percentage set forth on the cover of this Prospectus Supplement.
 
    No interest will accrue on the Class AP 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     %
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
Class, 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    % 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  as of any Determination Date will be the principal balance of such
Subclass   on    the   date    of   initial    issuance   of    the   Class    A
 
                                      S-31
<PAGE>
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'  pro rata share  of the  principal portion of
Excess Special Hazard Losses, Excess  Fraud Losses and Excess Bankruptcy  Losses
previously  allocated  to the  holders  of Class  A  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 may be subject to further reduction in an amount equal to
such Subclass' pro rata share of the difference, if any, between (a) the Class A
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 (Class AP 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 on the basis of their then-outstanding  Class
A  Subclass Principal Balances  immediately prior to  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 AP Principal Balance"  as of any Determination  Date will be the
principal balance of the Class AP  Certificates on the date of initial  issuance
of  the Class  AP Certificates  less (i)  all amounts  previously distributed to
holders of the Class  AP Certificates in reduction  of the principal balance  of
such  Class  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 previously
allocated to the holders  of the Class AP  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 AP  Principal Balance will be
subject to further reduction in  an amount equal to the  excess, if any, of  (a)
the  Class AP Principal Balance as of  such Determination Date without regard to
this provision over  (b) the  Adjusted Pool Amount  (Class AP  Portion) for  the
preceding Distribution Date.
 
    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 previously  allocated 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  sum
of  (i) the Class A  Principal Balance and (ii)  the Class AP Principal Balance,
each 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 previously allocated  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) Class A Principal Balance, (ii) the Class
AP Principal Balance, (iii) the Class M  Principal Balance and (iv) 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,
 
                                      S-32
<PAGE>
principal prepayments  and Liquidation  Proceeds in  respect of  principal)  and
distributed  to holders  of the Series  199 - 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 (Class AP
Portion)" will equal the sum as to each Mortgage Loan outstanding at the Cut-Off
Date of the product of (A) the Class AP 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 199 - 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 ranging  from    % to    % per
annum, (ii)  the Master  Servicing Fee  Rate as  set forth  in the  Pooling  and
Servicing  Agreement, (iii)  the Trustee  Fee Rate  and (iv)  the Fixed Retained
Yield Rate,  if  any, for  such  Mortgage  Loan. The  initial  weighted  average
Servicing  Fee Rate of the Mortgage  Loans is approximately     % per annum. 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
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. [Interest shortfalls resulting from principal
prepayments in full are referred to herein as "Prepayment Interest  Shortfalls."
Prepayment  Interest Shortfalls occurring with respect to Mortgage Loans will be
offset to the extent of the aggregate Servicing Fees due to the related Servicer
in respect of the related Distribution Date. Interest shortfalls resulting  from
the  timing of the receipt  of partial principal prepayments  and of net Partial
Liquidation Proceeds with respect  to the Mortgage Loans  will not be offset  by
Servicing  Fees payable to the related Servicer, but instead will be borne first
by the Class B Certificates, then by the Class M Certificates and finally by the
Class A Certificates. See "Description  of the Certificates -- Subordination  of
Class  M  and  Class  B  Certificates"  herein.  As  to  any  Distribution Date,
Prepayment Interest  Shortfalls to  the extent  that they  exceed the  aggregate
Servicing Fees payable to the related Servicer or Servicers on such Distribution
Date  are referred to herein as "Non-Supported Interest Shortfalls"] and will be
allocated to (i) the Class A  Certificates according to the percentage  obtained
by  dividing the then-outstanding  Class A Principal  Balance by the  sum of the
then-outstanding Class A 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 Principal Balance, Class M Principal Balance and
Class  B  Principal Balance  and (iii)  the Subclasses  of Class  B Certificates
according to the percentage  obtained by dividing  the then-outstanding Class  B
Subclass   Principal  Balance  of   each  such  Subclass  by   the  sum  of  the
then-outstanding Class A 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 will  be
allocated  among the Subclasses of Class A Certificates pro rata on the basis of
their respective Class A Subclass Interest Accrual Amounts without regard to any
reduction pursuant to this paragraph, for such Distribution Date. See "Servicing
of the Mortgage Loans -- Adjustment to Servicing Fee in Connection with  Prepaid
Mortgage Loans" in the Prospectus.
 
                                      S-33
<PAGE>
    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 or Subclass and among the Subclasses  of Class A Certificates pro rata  on
the basis of their respective Class A 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 Class B Certificates and then to  the Class M Certificates will result  from
the  priority of distributions  first to the holders  of the Senior Certificates
and then to the  Class M Certificateholders 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' 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 pro rata in  accordance with each such  Subclass' Class A  Subclass
Interest  Accrual Amount. Amounts so allocated will be distributed in respect of
interest to each Subclass  of Class A Certificates.  Any difference between  the
portion  of  the  Pool Distribution  Amount  distributed in  respect  of current
interest to  each 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 Subclass, the "Class A Subclass Interest Shortfall
Amount")  will  be  added  to  the  amount  to  be  distributed  on   subsequent
Distribution Dates 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 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 each Subclass of Class
A  Certificates, (ii) the sum of the  unpaid Class A Subclass Interest Shortfall
Amounts with respect  to each  Subclass of Class  A Certificates  and (iii)  the
Class  A Optimal  Principal Amount (collectively  with the  amounts described in
clauses (i) and (ii), the  "Class A Optimal Amount"),  (B) the Class AP  Optimal
Principal  Amount (collectively  with the  amount described  in clause  (A), the
"Senior  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 Senior  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
Senior 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.
 
                                      S-34
<PAGE>
    Subject to the payment of any Class AP Deferred Amount, on each Distribution
Date on which the Pool Distribution Amount exceeds the sum of the Senior 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 and  in
respect of interest and then principal on the Subclasses of Class B Certificates
in numerical order. 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.
 
    On any Distribution Date on which the Pool Distribution Amount is less  than
the  Senior 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  Certificate of any  Subclass or of any
Class AP or Class M Certificate at any time is equal to the product of the Class
A Subclass Principal Balance of such Subclass or the Class AP Principal  Balance
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 or  Class M
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 of each Subclass of Class
A Certificates  and the  approximate  initial Class  AP  and Class  M  Principal
Balances are set forth on the cover of this Prospectus Supplement.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS A CERTIFICATES
 
    Distributions  in  reduction  of  the  principal  balance  of  the  Class  A
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  Principal  Distribution  Amount") up  to  the  Class  A  Optimal
Principal Amount.
 
    The  "Class A  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 Classes A/M/B 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 the Scheduled Principal Balance of
       such  Mortgage Loan which,  during the month preceding  the month of such
       Distribution Date was repurchased by  a Representing Party, as  described
       under  the  heading  "Description  of  the  Mortgage  Loans  -- Mandatory
       Repurchase or Substitution of Mortgage Loans" herein,
 
    (iii) The Class A Prepayment Percentage of (a) the aggregate net Liquidation
       Proceeds (other  than  net  Partial Liquidation  Proceeds)  on  any  such
       Mortgage  Loan that became a Liquidated  Loan during such preceding month
       (excluding the  portion thereof,  if  any, constituting  Net  Foreclosure
       Profits,  as  defined  under  "--  Additional  Rights  of  the  Class A-R
       Certificateholder" below), less the amounts allocable to principal of any
       unreimbursed Periodic  Advances  previously  made with  respect  to  such
       Liquidated  Loan  and  the  portion  of  such  net  Liquidation  Proceeds
       allocable to  interest  and (b)  the  aggregate net  Partial  Liquidation
       Proceeds  on any such Mortgage Loan received  by any Servicer on or after
       the Determination
 
                                      S-35
<PAGE>
       Date  occurring  in  the  month   preceding  the  month  in  which   such
       Distribution Date occurs and prior to the Determination Date occurring in
       the  month  in which  such Determination  Date  occurs, less  the amounts
       allocable to  principal of  any unreimbursed  Periodic Advances  and  the
       portion of the net Partial Liquidation Proceeds allocable to interest,
 
    (iv) the Class A Prepayment Percentage of the Scheduled Principal Balance of
       each  Mortgage Loan  which was the  subject of a  principal prepayment in
       full during the period from and  including the Determination Date in  the
       month  preceding  the month  of  such Distribution  Date  up to  (but not
       including)  the  Determination  Date  occurring  in  the  month  of  such
       Distribution Date,
 
    (v)  the Class A Prepayment Percentage  of all partial principal prepayments
       received by any Servicer with respect  to such Mortgage Loan on or  after
       the  Determination Date  occurring in  the month  preceding the  month in
       which such Distribution Date occurs  and prior to the Determination  Date
       occurring in the month in which such Distribution Date occurs, and
 
    (vi)  the Class A Percentage of  the difference between the unpaid principal
       balance of any such  Mortgage Loan substituted  for a defective  Mortgage
       Loan during the month preceding the month in which such Distribution Date
       occurs  and the unpaid principal balance of such defective Mortgage Loan,
       less the amount allocable  to the principal  portion of any  unreimbursed
       advances in respect of such defective Mortgage Loan.
 
    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, each Subclass of Class  A Certificates then outstanding 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  "Classes A/M/B Fraction"  with respect to any  Mortgage Loan will equal
the Net Mortgage Interest Rate for such Mortgage Loan divided by    %.
 
    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  and to  the payment  of
principal  due on such Due Date, and  irrespective of any delinquency in payment
by the mortgagor and any net Partial Liquidation Proceeds applied as of such Due
Date and any principal prepayments in  full received prior to the  Determination
Date in the month of such Due Date.
 
    "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. 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 "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
 
                                      S-36
<PAGE>
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  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
loss 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. 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. Liquidated Loan  Losses (including Special  Hazard Losses and  Fraud
Losses) and Bankruptcy Losses are referred to herein as "Realized Losses."
 
    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 Principal Balance as of such
date (before taking into account distributions in reduction of principal balance
on such date)  by the Pool  Balance (Classes A/M/B  Portion). The "Pool  Balance
(Classes  A/M/B Portion)" is the  sum for each outstanding  Mortgage Loan of the
product of (i) the Classes  A/M/B 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
   %.  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 and
will increase as a result  of the allocation of Realized  Losses to the Class  B
and  Class M  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
- ----------------------------  ------------------------------------------------------------------------------------
<C>                           <S>
through.....................  100%;
through.....................  the Class A Percentage, plus 70% of the Subordinated Percentage;
through.....................  the Class A Percentage, plus 60% of the Subordinated Percentage;
through.....................  the Class A Percentage, plus 40% of the Subordinated Percentage;
through.....................  the Class A Percentage, plus 20% of the Subordinated Percentage; and
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 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) cumulative
Realized Losses  with  respect to  the  Mortgage Loans  exceed  (a) 30%  of  the
principal  balance of the Subordinated Certificates  as of the Cut-Off Date (the
"Original Subordinated Principal
 
                                      S-37
<PAGE>
Balance") if such Distribution Date occurs  between and including            and
         ,  (b)  35%  of the  Original  Subordinated Principal  Balance  if such
Distribution Date occurs between and including           and          , (c)  40%
of  the Original Subordinated Principal Balance if such Distribution Date occurs
between and including              and              ,  (d) 45%  of the  Original
Subordinated  Principal  Balance if  such Distribution  Date occurs  between and
including            and            , and (e)  50% of the Original  Subordinated
Principal  Balance if such Distribution Date occurs  during or after           .
This disproportionate allocation of certain  unscheduled payments in respect  of
principal  will have the effect of accelerating  the amortization of the Class A
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 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 of full and partial principal prepayments and other amounts in  the
percentage required above would reduce the outstanding Class A 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 Principal Balance to
zero.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS AP CERTIFICATES
 
    Distributions in reduction of the Class AP Principal Balance will be made on
each Distribution Date in  an aggregate amount equal  to the Class AP  Principal
Distribution  Amount. The "Class AP  Principal 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 AP 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  AP
Deferred Amount.
 
    The  "Class AP 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 Class  AP 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,
 
    (ii) the Scheduled Principal Balance of such Mortgage Loan which, during the
       month preceding the month of such Distribution Date was repurchased by  a
       Representing  Party, as described  under the heading  "Description of the
       Mortgage Loans -- Mandatory Repurchase or Substitution of Mortgage Loans"
       herein,
 
    (iii) the sum of (a) the aggregate net Liquidation Proceeds (other than  net
       Partial  Liquidation Proceeds)  on any such  Mortgage Loan  that became a
       Liquidated Loan  during  such  preceding  month  (excluding  the  portion
       thereof,  if any, constituting Net Foreclosure Profits), less the amounts
       allocable to principal of  any unreimbursed Periodic Advances  previously
       made  with respect to  such Liquidated Loan  and the portion  of such net
       Liquidation Proceeds  allocable to  interest and  (b) the  aggregate  net
       Partial  Liquidation Proceeds  on any  such Mortgage  Loan received  by a
       Servicer on  or  after the  Determination  Date occurring  in  the  month
       preceding  the month in which such  Distribution Date occurs and prior to
       the Determination Date occurring in the month in which such  Distribution
       Date  occurs, less the amounts allocable to principal of any unreimbursed
       Periodic Advances and the portion of the net Partial Liquidation Proceeds
       allocable to interest,
 
                                      S-38
<PAGE>
    (iv) the Scheduled  Principal Balance of  such Mortgage Loan  which was  the
       subject  of a  principal prepayment  in full  during the  period from and
       including the Determination Date in the month preceding the month of such
       Distribution Date  up  to  (but not  including)  the  Determination  Date
       occurring in the month of such Distribution Date,
 
    (v) all partial principal prepayments received by a Servicer on or after the
       Determination  Date occurring in  the month preceding  the month in which
       such Distribution  Date  occurs  and  prior  to  the  Determination  Date
       occurring in the month in which such Distribution Date occurs, and
 
    (vi)  the  difference  between  the unpaid  principal  balance  of  any such
       Mortgage Loan substituted for a defective Mortgage Loan during the  month
       preceding the month in which such Distribution Date occurs and the unpaid
       principal  balance  of  such  defective 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  AP 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 AP Optimal Principal Amount for all prior Distribution Dates
exceeds the  amounts distributed  on the  Class AP  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  AP  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 in any  month preceding the month of the  current
Distribution  Date of (a) the Class AP  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 AP
Certificates on prior Distribution Dates pursuant to priority FOURTH of the Pool
Distribution Amount Allocation. On  or after the Cross-Over  Date, the Class  AP
Deferred  Amount will be zero. No interest  will accrue on any Class AP Deferred
Amount.
 
    The "Class AP  Fraction" with  respect to  any Discount  Mortgage Loan  will
equal  the  difference  between 1.0  and  the  Classes A/M/B  Fraction  for such
Mortgage Loan. The Class AP Fraction with respect to each Mortgage Loan that  is
not a Discount Mortgage Loan will be zero.
 
    The  "Pool Balance (Class AP Portion)" is the sum for each Discount Mortgage
Loan of the product of the Scheduled Principal Balance of such Mortgage Loan and
the Class AP Fraction for such Mortgage Loan.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS M 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  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 Classes A/M/B 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,
 
                                      S-39
<PAGE>
    (ii) 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  a Representing Party, as described
       under the  heading  "Description  of  the  Mortgage  Loans  --  Mandatory
       Repurchase or Substitution of Mortgage Loans" herein,
 
    (iii) the Class M Prepayment Percentage of (a) the aggregate net Liquidation
       Proceeds  (other  than  net  Partial Liquidation  Proceeds)  on  any such
       Mortgage Loan that became a  Liquidated Loan during such preceding  month
       (excluding  the  portion thereof,  if  any, constituting  Net Foreclosure
       Profits), less the  amounts allocable  to principal  of any  unreimbursed
       Periodic  Advances previously made  with respect to  such Liquidated Loan
       and the portion of  such net Liquidation  Proceeds allocable to  interest
       and  (b)  the  aggregate net  Partial  Liquidation Proceeds  on  any such
       Mortgage Loan received by a Servicer  on or after the Determination  Date
       occurring  in the  month preceding the  month in  which such Distribution
       Date occurs and prior to the Determination Date occurring in the month in
       which such  Distribution  Date  occurs, less  the  amounts  allocable  to
       principal  of any unreimbursed  Periodic Advances and  the portion of the
       net Partial Liquidation Proceeds allocable to interest,
 
    (iv) the Class M Prepayment Percentage of the Scheduled Principal Balance of
       such Mortgage Loan  which was the  subject of a  principal prepayment  in
       full  during the period from and  including the Determination Date in the
       month preceding  the month  of  such Distribution  Date  up to  (but  not
       including)  the  Determination  Date  occurring  in  the  month  of  such
       Distribution Date,
 
    (v) the Class M Prepayment  Percentage of all partial principal  prepayments
       received by a Servicer with respect to such Mortgage Loan on or after the
       Determination  Date occurring in  the month preceding  the month in which
       such Distribution  Date  occurs  and  prior  to  the  Determination  Date
       occurring in the month in which such Distribution Date occurs, and
 
    (vi)  the Class M Percentage of  the difference between the unpaid principal
       balance of any such  Mortgage Loan substituted  for a defective  Mortgage
       Loan during the month preceding the month in which such Distribution Date
       occurs  and the unpaid principal balance of such defective Mortgage Loan,
       less the  amounts allocable  to principal  of any  unreimbursed  Periodic
       Advances  with respect to such defective  Mortgage Loan. See "The Pooling
       and Servicing Agreement -- Assignment  of Mortgage Loans to the  Trustee"
       in the Prospectus.
 
    The  principal distribution to  the holders of Class  M Certificates will be
reduced on any Distribution Date on which (i) the principal balance of the Class
M 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  Senior Certificates  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 will instead be distributed pro rata to the holders of the
Class A Certificates.
 
    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, the  Class M  Certificates will be  entitled to  their pro  rata
share  of such recovery up to the amount  by which the Class M 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.
 
                                      S-40
<PAGE>
    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
and  the Class M Prepayment Percentage for  such Distribution Date. In the 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  and the Class M Prepayment Percentage 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 and the Class  M Prepayment Percentage 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 and the Class  M Prepayment Percentage 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 Principal Balance,  initial Class M  Principal Balance  and
initial  Class B Principal Balance. The  Original Class M Fractional Interest is
expected to be approximately    %. 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  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 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       %.  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  Principal Balance,  the  Class M  Principal  Balance and  the  Class B
Principal Balance.
 
                                      S-41
<PAGE>
    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
Principal Balance,  initial  Class  M  Principal Balance  and  initial  Class  B
Principal  Balance. The Original Class B-2 Fractional Interest is expected to be
approximately       %. 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  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  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       %.  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 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 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    %. 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 Principal  Balance,
the Class M Principal Balance and the Class B Principal Balance.
 
    ALLOCATION OF AMOUNT TO BE DISTRIBUTED
 
    On  each Distribution Date occurring prior to the Cross-Over Date, the Class
A Principal  Distribution Amount  will  be allocated  among and  distributed  in
reduction  of the Class A Subclass Principal Balances of the other Subclasses of
Class A Certificates as follows:
 
                        [INSERT DISTRIBUTION PRIORITIES]
 
    As used above, the "PAC Principal Amount" for any Distribution Date and  for
the  PAC Certificates means  the amount, if  any, that would  reduce the Class A
Subclass Principal Balance  of such Subclass  to the percentage  of its  initial
Class A Subclass Principal Balance shown in the following tables with respect to
such Distribution Date.
 
    As  used above, the "TAC Principal Amount" for any Distribution Date and for
the TAC Certificates means  the amount, if  any, that would  reduce the Class  A
Subclass  Principal Balance  of such Subclass  to the percentage  of its initial
Class A Subclass Principal Balance shown in the following tables with respect to
such Distribution Date.
 
    Notwithstanding the foregoing,  on each  Distribution Date  occurring on  or
after  the Cross-Over  Date, the Class  A Principal Distribution  Amount will be
distributed among the Subclasses of Class A 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.
 
                                      S-42
<PAGE>
    Any  amounts distributed on  a Distribution Date  to the holders  of Class A
Certificates 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.  Amounts distributed on any  Distribution
Date  to the holders  of the Class AP  and Class M  Certificates in reduction of
principal balance will  be allocated among  the holders of  each such Class  pro
rata in accordance with their respective Percentage Interests.
 
    The  following tables set forth for each Distribution Date the planned Class
A Subclass Principal Balance for the  PAC Certificates and the targeted Class  A
Subclass  Principal  Balance  of  the  TAC  Certificates,  each  expressed  as a
percentage of the initial Class A Subclass Principal Balance.
 
            PLANNED CLASS A SUBCLASS PRINCIPAL BALANCE AS PERCENTAGE
   OF THE INITIAL CLASS A SUBCLASS PRINCIPAL BALANCE OF THE PAC CERTIFICATES
 
<TABLE>
<CAPTION>
                                                   PERCENTAGE OF
                                                  INITIAL CLASS A
                                                      SUBCLASS
DISTRIBUTION DATE                                PRINCIPAL BALANCE
- ---------------------------------------------  ----------------------
<S>                                            <C>
</TABLE>
 
           TARGETED CLASS A SUBCLASS PRINCIPAL BALANCE AS PERCENTAGE
   OF THE INITIAL CLASS A SUBCLASS PRINCIPAL BALANCE OF THE TAC CERTIFICATES
 
<TABLE>
<CAPTION>
                                                   PERCENTAGE OF
                                                  INITIAL CLASS A
                                                      SUBCLASS
DISTRIBUTION DATE                                PRINCIPAL BALANCE
- ---------------------------------------------  ----------------------
<S>                                            <C>
</TABLE>
 
    PRINCIPAL PAYMENT CHARACTERISTICS OF THE PAC CERTIFICATES, THE TAC
CERTIFICATES AND THE COMPANION CERTIFICATES
 
    The percentages of the  initial Class A Subclass  Principal Balances of  the
PAC Certificates and the TAC Certificates set forth in the preceding tables were
calculated  using the  assumptions described  in the       paragraph  on page S-
herein. Based on such assumptions, the Class A Subclass Principal Balance of the
PAC Certificates  would be  reduced to  the percentage  of its  initial Class  A
Subclass   Principal  Balance  indicated  in   the  preceding  tables  for  each
Distribution Date if  prepayments on the  Mortgage Loans occur  at any  constant
rate  between approximately     %  SPA (as defined  herein under "Prepayment and
Yield Considerations") and approximately     %  SPA. Based on such  assumptions,
the  Class A Subclass Principal Balance of the TAC Certificates would be reduced
to the percentage  of its Class  A Subclass Principal  Balance indicated in  the
preceding tables for each Distribution Date if prepayments on the Mortgage Loans
occur  at a  CONSTANT rate  of approximately      %  SPA. However,  IT IS HIGHLY
UNLIKELY THAT PRINCIPAL  PREPAYMENTS ON  THE MORTGAGE  LOANS WILL  OCCUR AT  ANY
CONSTANT  RATE  OR THAT  THE MORTGAGE  LOANS WILL  PREPAY AT  THE SAME  RATE. In
addition, even if principal  prepayments were to occur  at constant rate,  there
may  be differences between the characteristics of the mortgage loans ultimately
included  in   the   Trust   Estate   and   the   Mortgage   Loans   which   are
 
                                      S-43
<PAGE>
expected  to  be  included, as  described  herein.  Therefore, there  can  be no
assurance that the Class A Subclass Principal Balance of the PAC Certificates or
the TAC Certificates, after the application  of the distributions to be made  on
any Distribution Date, will be equal to the applicable percentage of the initial
Class  A Subclass Principal Balance for  such Distribution Date specified in the
preceding tables.
 
    As  discussed  under  "Prepayment  and  Yield  Considerations"  herein,  the
weighted  average life of a Subclass or  Class of Offered Certificates 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 investors. The weighted average life of
each Subclass of Class A Certificates  will be affected, to varying degrees,  by
the  rate of principal  payments (including prepayments)  on the Mortgage Loans,
the timing of changes in such rate of payment and the priority of  distributions
in  reduction  of  principal of  the  Class  A Certificates  and  the  timing of
reductions of  the  principal balances  of  the  PAC Certificates  and  the  TAC
Certificates  and to  their respective  planned principal  balances and targeted
principal balances. The interaction of these factors may have different  effects
on  the Subclasses of  Class A Certificates, including  the PAC Certificates and
the TAC Certificates,  and the  effects on any  Subclass may  vary at  different
times during the life of such Subclass. Further, to the extent that the purchase
prices  paid  by  investors for  the  Class  A Certificates,  including  the PAC
Certificates and the TAC Certificates  represent discounts or premiums to  their
respective initial principal balances, variability in the weighted average lives
of  such  Certificates could  result  in variability  in  the related  yields to
maturity. See "Prepayment and Yield Considerations" herein.
 
    The weighted average lives of the PAC Certificates will vary under different
prepayment scenarios.  To  the extent  that  principal prepayments  occur  at  a
CONSTANT rate that is slower than approximately    % SPA with respect to the PAC
Certificates,  the Class  A Principal  Distribution Amount  on each Distribution
Date may be  insufficient to make  distributions in reduction  of the  principal
balances  of the PAC Certificates in an amount that would reduce their principal
balance to  their planned  principal  balance for  such Distribution  Date.  The
weighted  average lives  of the PAC  Certificates may therefore  be extended, as
illustrated by the tables on page S-  .
 
    To the extent that such principal prepayments occur at a CONSTANT rate  that
is  higher than approximately    % SPA with respect to the PAC Certificates, the
weighted average lives of the PAC Certificates may be shortened, as  illustrated
by the tables on page S-  .
 
    To the extent that principal prepayments are made at a CONSTANT rate that is
slower than approximately    % SPA, the Class A Principal Distribution Amount on
each Distribution Date may be insufficient to make distributions in reduction of
the  principal balance of  the TAC Certificates  in an amount  that would reduce
their  principal  balance   to  their  targeted   principal  balance  for   such
Distribution  Date.  The  weighted average  lives  of the  TAC  Certificates may
therefore be extended, as illustrated by the tables on page S-  . To the  extent
that  such principal prepayments  occur at a  CONSTANT rate that  is higher than
approximately    % SPA, the  weighted average lives of the TAC Certificates  may
be shortened as illustrated by the tables on page S-  .
 
    The  weighted  average life  of the  Companion  Certificates will  be highly
sensitive to  the rate  of  principal payments  (including prepayments)  on  the
Mortgage Loans. See "Prepayment and Yield Considerations" herein.
 
    The  extent to which the planned principal balances will be achieved and the
sensitivity of the  PAC Certificates  to principal prepayments  on the  Mortgage
Loans  will depend, in part, upon the  period of time during which the Companion
Certificates and the TAC Certificates  remain outstanding. On each  Distribution
Date,  the excess of the  Class A Principal Amount  of the PAC Principal Amounts
("Excess Principal Payment") for such  Distribution Date will be distributed  to
the  Companion Certificates and the TAC Certificates before being distributed to
the PAC  Certificates, in  accordance with  the proportions  and priorities  set
forth  above under "-- Allocation of Amount to be Distributed." This is intended
to decrease the likelihood  that the principal balance  of the PAC  Certificates
will  be reduced  below the  planned principal  balance on  a given Distribution
Date. As  such, and  in  accordance with  the  priorities described  above,  the
Companion    Certificates   and   the   TAC   Certificates   support   the   PAC
 
                                      S-44
<PAGE>
Certificates. However, under certain  relatively fast prepayment scenarios,  the
PAC  Certificates may continue to be outstanding  when the Subclasses of Class A
Certificates that support the PAC Certificates are no longer outstanding.  Under
such  circumstances, all  Excess Principal Payments  will be applied  to the PAC
Certificates and in accordance with the priorities described herein. Thus,  when
the  principal balances of  the Companion Certificates  and the TAC Certificates
have been reduced to  zero, the PAC Certificates,  if then outstanding will,  in
accordance  with the  proportions and  priorities set  forth above,  become more
sensitive to the rate of prepayment on the Mortgage Loans as such Subclass  will
receive  all Excess  Principal Payments until  the principal balance  of the PAC
Certificates has been reduced to zero. Conversely, under certain relatively slow
prepayment scenarios,  the Class  A  Principal Distribution  Amount may  not  be
sufficient  to pay the PAC Principal Amount  for the PAC Certificates on a given
Distribution Date.  In  such  cases,  the Class  A  Principal  Amount  for  each
subsequent  Distribution Date will be applied  in accordance with the priorities
described herein such that the  Companion Certificates and the TAC  Certificates
will  not receive  any distributions  in reduction  of their  principal balances
until the outstanding principal balance of the PAC Certificates has reached  the
planned  principal balance for such Distribution Date. As a result, the weighted
average life of the PAC Certificates may  be extended if such Subclass does  not
receive its PAC Principal Amount on a Distribution Date.
 
    The extent to which the targeted principal balances will be achieved and the
sensitivity  of the  TAC Certificates to  principal prepayments  on the Mortgage
Loans will depend, in part, upon the  period of time during which the  Companion
Certificates  remain outstanding.  On each  Distribution Date,  Excess Principal
Payments over  the TAC  Principal  Amount for  such  Distribution Date  will  be
distributed  to the Companion Certificates, before  being distributed to the TAC
Certificates, in  accordance  with the  priorities  set forth  above  under  "--
Allocation  of  Amount to  be  Distributed." This  is  intended to  decrease the
likelihood that the principal  balance of the TAC  Certificates will be  reduced
below  the targeted principal balance on such Distribution Date. As such, and in
accordance with  the  priorities  described above,  the  Companion  Certificates
support  the TAC Certificates. However, under certain relatively fast prepayment
scenarios, the  TAC  Certificates  may  continue  to  be  outstanding  when  the
Companion  Certificates are no longer outstanding. Under such circumstances, all
Excess Principal Payments will  be applied to the  TAC Certificates. Thus,  when
the  principal balance of  the Companion Certificates has  been reduced to zero,
the TAC  Certificates,  if  then  outstanding,  will,  in  accordance  with  the
proportions  and priorities set forth herein,  become more sensitive to the rate
of prepayment on  the Mortgage Loans  as such Subclass  will receive all  Excess
Principal  Payments until the principal balance of the TAC Certificates has been
reduced to zero. Conversely, under certain relatively slow prepayment scenarios,
Excess Principal  Payments,  if  any, may  not  be  sufficient to  pay  the  TAC
Principal  Amount for the TAC Certificates on a given Distribution Date. In such
cases, Excess Principal Payments for  such subsequent Distribution Date will  be
applied  in accordance with the proportions and priorities described herein such
that the Companion Certificates will not receive any distributions in  reduction
of  their principal balance  until the outstanding principal  balance of the TAC
Certificates has reached  the targeted principal  balance for such  Distribution
Date.  As a  result, the weighted  average life  of the TAC  Certificates may be
extended if such  Subclass does  not receive its  TAC Principal  Amount on  such
Distribution Date.
 
    Because  any Excess  Principal Payments  for any  Distribution Date  will be
distributed to  Certificateholders on  such Distribution  Date, the  ability  to
distribute the PAC Principal Amount and TAC Principal Amount on any Distribution
Date  will not be enhanced by the averaging of high and low principal prepayment
rates on the  Mortgage Loans over  several Distribution Dates,  as might be  the
case if any such Excess Principal Payments were held for future applications and
not distributed monthly. There is no assurance that, with respect to the Class A
Principal  Amount  (i)  distributions  in  reduction  of  the  Class  A Subclass
Principal Balance  of the  PAC Certificates  or the  TAC Certificates  will  not
commence  significantly earlier  than the first  Distribution Date  shown in the
preceding tables relating to such  Subclass, (ii) distributions in reduction  of
the Class A Subclass Principal Balance of
 
                                      S-45
<PAGE>
PAC  Certificates or the TAC Certificates  will not commence significantly later
than the first Distribution Date shown in the preceding tables relating to  such
Subclass  or (iii) the Class A Subclass Principal Balance of PAC Certificates or
the TAC  Certificates will  not  be reduced  to  zero significantly  earlier  or
significantly  later  than the  last Distribution  Date  shown in  the preceding
tables.
 
EXAMPLE OF DISTRIBUTION TO CERTIFICATEHOLDERS
 
    The following  chart  sets  forth  an example  of  the  application  of  the
provisions  described above under "-- Distributions"  to the first two months of
the Trust Estate's existence:
 
<TABLE>
<CAPTION>
1(A).........................  Cut-Off Date.
<S>                            <C>
2 -- 31(B)...................  The applicable Servicer receives any liquidation
                               proceeds for liquidated Mortgage Loans and interest
                               thereon to date of liquidation.
31(C)........................  Record Date.
1 -- 16(D)...................  The applicable Servicer receives scheduled payments
                               of principal and interest due on 1.
17(E)........................  Determination Date.
18(F)........................  Remittance Date.
25(G)........................  Distribution Date
</TABLE>
 
- ------------------------
(A) The initial unpaid principal balance of the Mortgage Loans in a Trust Estate
    would be the aggregate unpaid principal balance of the Mortgage Loans at the
    close of business on           1, after deducting principal payments due  on
    or  before such date. Those principal payments  due on or before           1
    and the related interest payments, would not be part of the Trust Estate and
    would be remitted by the applicable Servicer to the Seller when received.
 
(B) Liquidation Proceeds received during  this period would  be credited to  the
    Certificate  Account for distribution to  Certificateholders on the February
    25 Distribution Date.  When a Mortgage  Loan is liquidated  or an  insurance
    claim  with respect to  a Mortgage Loan  is settled, interest  on the amount
    liquidated or  received  in  settlement  is collected  only  from  the  last
    scheduled Due Date to the date of liquidation or settlement.
 
(C) Distributions in the month of February will be made to Certificateholders of
    record at the close of business on this date.
 
(D) Schedule  monthly  payments on  the Mortgage  Loans due  on February  1, and
    principal prepayments  and  Partial  Liquidation Proceeds  received  by  the
    applicable  Servicer in  reduction of  the unpaid  principal balance  of any
    Mortgage Loan  prior to  February  17, will  be  deposited in  the  Servicer
    Custodial  Account as received  by such Servicer and  will be distributed to
    Certificateholders  on  the  February  25  Distribution  Date.   Liquidation
    Proceeds  (other  than  Partial  Liquidation  Proceeds),  and  proceeds with
    respect to the repurchase or purchase of any of the Mortgage Loans, in  each
    case  received  during this  period, and  principal prepayments  and Partial
    Liquidation Proceeds received on or after February 17, will be deposited  in
    the Certificate Account but will not be distributed to Certificateholders on
    the February 25 Distribution Date. Instead, such amounts will be credited to
    the  Certificate Account for distribution to Certificateholders on the March
    25 Distribution  Date. When  a Mortgage  Loan is  prepaid in  part and  such
    payment  is applied as of a date other  than a Due Date, interest is charged
    on such payment only to the date applied. To the extent funds are  available
    from  the aggregate Servicing  Fees relating to  mortgagor payments or other
    recoveries distributed  to Certificateholders  on the  related  Distribution
    Date,   the  applicable  Servicer  would   make  an  additional  payment  to
    Certificateholders with respect to any Mortgage Loan that prepaid in full on
    or after the Determination  Date in the month  preceding the month in  which
    such   Distribution  Date  occurs  equal  to   the  amount  of  interest  on
 
                                      S-46
<PAGE>
    such Mortgage Loan at the Net Mortgage Interest Rate for such Mortgage  Loan
    from  the  date of  such prepayment  in full  through the  end of  the month
    preceding the month in which such Distribution Date occurs.
 
(E) As of the close of business on February 17, each Servicer will determine the
    amounts of  Periodic Advances  to be  made by  such Servicer  in respect  of
    Mortgage  Loans serviced thereby and the  Master Servicer will determine the
    amounts  of  principal  and  interest  which  will  be  distributed  to  the
    Certificateholders, including scheduled payments due on or before February 1
    which  have been received on or before the close of business on February 16,
    principal prepayments  and Partial  Liquidation  Proceeds received  by  each
    Servicer  in reduction of the unpaid  principal balance of any Mortgage Loan
    prior  to  February  17  and   liquidation  proceeds  (other  than   Partial
    Liquidation  Proceeds),  and  proceeds  with respect  to  the  repurchase or
    purchase of any of the Mortgage Loans, received during the period commencing
    January 2 and ending on January  31. The Master Servicer will calculate  the
    amounts  to be distributed to each  Class of Certificates and will determine
    the Percentage Interest of each Subclass  or Subclass of Certificates to  be
    used in connection with the March 25 Distribution Date.
 
(F) Each  Servicer will be required  to remit to the  Certificate Account on the
    February 18  Remittance  Date  all  amounts on  deposit  in  the  respective
    Servicer   Custodial   Account   (other  than   amounts   held   for  future
    distribution).
 
(G) The Master Servicer,  or the  paying agent acting  on behalf  of the  Master
    Servicer,  will make distributions to Certificateholders  on the 25th day of
    each month or if such 25th day is  not a business day, on the next  business
    day.
 
    Succeeding  monthly periods  follow the pattern  of (B)  through (F), except
that the period in (B) begins on the seventeenth of the previous month.
 
ADDITIONAL RIGHTS OF THE CLASS A-R CERTIFICATEHOLDER
 
    The Class A-R Certificate 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 holder of the Class A-R  Certificate
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  199   -
Certificates,  after distributions in respect of any accrued but unpaid interest
on the  Series  199 -  Certificates  and  after distributions  in  reduction  of
principal  balance  have reduced  the  principal balances  of  the Series  199 -
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 199 - Certificates on such date.
 
    In  addition,  the  Class A-R  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 (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  199 - 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
 
                                      S-47
<PAGE>
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 Trustee,  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 Trustee,  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  Trustee, 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.
 
[FOR SERIES WITH A FINANCIAL GUARANTY INSURANCE POLICY:
FINANCIAL SECURITY ASSURANCE INC.
 
    GENERAL.    Financial Security  Assurance Inc.  ("Financial Security")  is a
monoline insurance company incorporated in 1984  under the laws of the State  of
New  York. Financial Security is licensed, directly or through its subsidiaries,
to engage  in  financial guaranty  insurance  business  in all  50  states,  the
District of Columbia and Puerto Rico.
 
    Financial  Security  and its  subsidiaries  are engaged  exclusively  in the
business of  writing financial  guaranty insurance,  principally in  respect  of
securities  offered  in  domestic  and foreign  markets.  In  general, financial
guaranty insurance consists of the issuance of a guaranty of scheduled  payments
of  an  issuer's securities  --  thereby enhancing  the  credit rating  of those
securities -- in  consideration for  the payment of  a premium  to the  insurer.
Financial   Security  and  its  subsidiaries  principally  insure  asset-backed,
collateralized and municipal securities.  Asset-backed securities are  generally
supported   by  residential  mortgage  loans,  consumer  or  trade  receivables,
securities or other assets  having an ascertainable cash  flow or market  value.
Collateralized  securities  include  public  utility  first  mortgage  bonds and
sale/leaseback obligation bonds. Municipal securities consist largely of general
obligation bonds, special revenue bonds  and other special obligations of  state
and  local governments. Financial Security  insures both newly issued securities
sold in the  primary market  and outstanding  securities sold  in the  secondary
market that satisfy Financial Security's underwriting criteria.
 
    Financial  Security  is  a  wholly owned  subsidiary  of  Financial Security
Assurance Holdings Ltd. ("Holdings"), a New York Stock Exchange listed  company.
Major shareholders of Holdings include Fund American Enterprises Holdings, Inc.,
U.S.  West Capital Corporation and the Tokio Marine and Fire Insurance Co., Ltd.
No shareholder of Holdings is obligated to pay any debt of Financial Security or
any claim under any insurance policy issued by Financial Security or to make any
additional contribution to the capital of Financial Security.
 
    The principal executive  offices of  Financial Security are  located at  350
Park Avenue, New York, New York 10022, and its telephone number at that location
is (212) 826-0100. At December 31, 1995, Financial Security and its subsidiaries
had 187 employees.
 
    REINSURANCE.     Pursuant  to  an  intercompany  agreement,  liabilities  on
financial  guaranty  insurance  written  or  reinsured  from  third  parties  by
Financial   Security  or  any  of   its  domestic  operating  insurance  company
subsidiaries are reinsured  among such  companies on  an agreed-upon  percentage
substantially  proportional to  their respective capital,  surplus and reserves,
subject  to  applicable  statutory  risk  limitations.  In  addition,  Financial
Security  reinsures a portion of its  liabilities under certain of its financial
guaranty insurance  policies with  other reinsurers  under various  quota  share
 
                                      S-48
<PAGE>
treaties and on a transaction-by-transaction basis. Such reinsurance is utilized
by  Financial Security as  a risk management  device and to  comply with certain
statutory and rating agency requirements; it  does not alter or limit  Financial
Security's obligations under any financial guaranty insurance policy.
 
    RATING OF CLAIMS-PAYING ABILITY.  Financial Security's claims-paying ability
is  rated "Aaa" by Moody's  and "AAA" by S&P,  Nippon Investors Service Inc. and
Standard & Poor's (Australia) Pty. Ltd.  Such ratings reflect only the views  of
the  respective rating  agencies, are not  recommendations to buy,  sell or hold
securities and are subject to revision or withdrawal at any time by such  rating
agencies.
 
    CAPITALIZATION.    The  following  table sets  forth  the  capitalization of
Financial Security and its wholly owned  subsidiaries on the basis of  generally
accepted accounting principles as of December 31, 1995 (in thousands):
 
<TABLE>
<CAPTION>
                                                                             DECEMBER 31, 1995
                                                                             -----------------
<S>                                                                          <C>
Unearned Premium Reserve (net of prepaid reinsurance premiums).............    $     330,349
Shareholder's Equity:
  Common Stock.............................................................           15,000
  Additional Paid-In Capital...............................................          681,470
  Unrealized Gain on Investments (net of deferred income taxes)............           19,694
  Accumulated Earnings.....................................................           73,822
                                                                             -----------------
Total Shareholder's Equity.................................................    $     789,986
                                                                             -----------------
Total Unearned Premium Reserve and Shareholder's Equity....................    $   1,120,335
                                                                             -----------------
                                                                             -----------------
</TABLE>
 
    For  further information concerning Financial Security, see the Consolidated
Financial Statements  of  Financial Security  and  Subsidiaries, and  the  notes
thereto, incorporated by reference herein. Copies of the statutory quarterly and
annual  statements  filed with  the State  of New  York Insurance  Department by
Financial Security are available upon request to the State of New York Insurance
Department.
 
    INCORPORATION OF  CERTAIN  DOCUMENTS  BY  REFERENCE.   In  addition  to  the
documents described under "Incorporation of Certain Information by Reference" in
the  Prospectus, the consolidated financial statements of Financial Security and
subsidiaries for the year  ended December 31, 1995  included as exhibits to  the
following  document,  which  has been  filed  with the  Securities  and Exchange
Commission by Holdings, are hereby incorporated by reference in the Registration
Statement to which the Prospectus and this Prospectus Supplement form a part:
 
        (a) Annual Report on Form 10-K  of Holdings for the year ended  December
    31,  1995, which Report included as  an exhibit Financial Security's audited
    consolidated financial statements for the year ended December 31, 1995.
 
       [(b) Reference quarterly reports, as applicable.]
 
    All financial statements of Financial Security and Subsidiaries included  in
documents filed by Holdings pursuant to Section 13(a), 13(c), 14 or 15(d) of the
Securities  Exchange Act of 1934, as amended (the "Exchange Act"), subsequent to
the date  of this  Prospectus Supplement  and prior  to the  termination of  the
offering  of the  Certificates shall be  deemed to be  incorporated by reference
into this Prospectus  Supplement and  to be a  part hereof  from the  respective
dates of filing such documents.
 
    INSURANCE  REGULATION.    Financial  Security  is  licensed  and  subject to
regulation as a financial guaranty insurance  corporation under the laws of  the
State  of New York, its  state of domicile. In  addition, Financial Security and
its insurance subsidiaries are  subject to regulation by  insurance laws of  the
various  other jurisdictions  in which  they are licensed  to do  business. As a
financial guaranty insurance corporation licensed to do business in the State of
New York, Financial Security is subject to
 
                                      S-49
<PAGE>
Article 69 of the New York Insurance  Law which, among other things, limits  the
business of each such insurer to financial guaranty insurance and related lines,
requires  that  each  insurer  maintain  a  minimum  surplus  to  policyholders,
establishes contingency, loss and unearned premium reserve requirements for each
such insurer, and limits  the size of  individual transactions ("single  risks")
and  the volume of transactions ("aggregate  risks") that may be underwritten by
each such insurer. Other provisions of the New York Insurance Law, applicable to
non-life insurance companies such as  Financial Security, regulate, among  other
things,   permitted  investments,   payment  of   dividends,  transactions  with
affiliates,  mergers,  consolidations,  acquisitions  or  sales  of  assets  and
incurrence of liability for borrowings.]
 
RESTRICTIONS ON TRANSFER OF THE CLASS A-R AND CLASS M CERTIFICATES
 
    The  Class A-R Certificate will be  subject to the following restrictions on
transfer, and the Class  A-R 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
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 Certificate may be transferred
to or registered in  the name of  any person unless  (i) the proposed  purchaser
provides  to  the Trustee  an affidavit  (or,  to the  extent acceptable  to the
Trustee, 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 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 Trustee that
it has no actual knowledge that such affidavit 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
Certificate in excess  of cash  flows generated  thereby, (iii)  intends to  pay
taxes associated with holding the Class A-R Certificate as such taxes become due
and  (iv) will not  transfer the Class  A-R Certificate to  any person or entity
that does  not provide  a similar  affidavit (or  letter). The  transferor  must
certify  in writing to the Trustee 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.
 
    In  addition,  the  Class  A-R  Certificate  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 Certificate  in connection with the  conduct of a trade or
business within the United States and  furnishes the transferor and the  Trustee
with  an effective  Internal Revenue  Service Form  4224 or  (ii) the transferee
delivers to  both the  transferor and  the Trustee  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  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,
or an estate or trust that is  subject to U.S. 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 Trustee 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.
 
                                      S-50
<PAGE>
    The  Class A-R Certificate may not be purchased by or transferred to a Plan.
Because the Class M  Certificates are subordinated  to the Senior  Certificates,
the  Class  M 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 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 cause to be included in the statement delivered to holders
of Class A, Class AP and Class M 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  Certificates and  to the  Class M  Certificates, any  Class A  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 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 Principal Balance, the Class AP Principal Balance, the Class M
Principal  Balance, the Class  A Subclass Principal Balance  of each Subclass of
Class A Certificates after  giving effect to the  distribution of principal  and
the allocation of the principal portion of Realized Losses to such Subclass with
respect  to such Distribution Date, (iv)  the Adjusted Pool Amount, the Adjusted
Pool Amount (Class AP 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 and  Class
M  Percentage  for the  following Distribution  Date  (without giving  effect to
partial prepayments  and net  Partial Liquidation  Proceeds received  after  the
Determination  Date in  the current month  that are  applied as of  the Due Date
occurring in such month),  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.  See "Servicing  of the  Mortgage
Loans -- Reports to Certificateholders" in the Prospectus.
 
    Copies  of the foregoing  reports are available upon  written request to the
Trustee at its corporate trust office.  See "Pooling and Servicing Agreement  --
Trustee" 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  Senior Certificates and 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  Senior Certificates and the Class M  Certificates,
all to the extent described below. This subordination is intended to enhance the
likelihood  of timely receipt by the holders  of the Senior Certificates (to the
extent of the subordination  of the Class  M and Class  B Certificates) and  the
holders  of the Class M Certificates (to  the extent of the subordination of the
Class B Certificates) of the full amount of their scheduled monthly payments  of
interest  and principal and to afford the holders of the Senior Certificates (to
the extent of the subordination of the Class M and Class B Certificates) and the
holders of the Class M Certificates (to  the extent of the subordination of  the
Class  B  Certificates)  protection  against  Realized  Losses,  as  more  fully
described below. If Realized Losses  exceed the credit support provided  through
subordination  to the  Senior Certificates  and the  Class M  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 Senior Certificates
and the Class M Certificates.
 
                                      S-51
<PAGE>
    The protection afforded to  the holders of Senior  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 and the amount of principal due  the
Class   AP  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 AP Deferred Amount) and  interest due the Class M
Certificateholders on each Distribution Date  from the Pool Distribution  Amount
with   respect  to  such  date  (after  all  required  payments  on  the  Senior
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.
 
    The  Subclasses  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 Senior Optimal  Amount, the Class  AP
Deferred  Amount  and the  Class  M Optimal  Amount  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
Senior  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 date  on which the Subordinated Percentage
has been  reduced 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  AP  Principal Balance,  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 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 Trustee  does
not  advance and (iv) any  interest shortfalls resulting from  the timing of the
receipt of partial  principal prepayments and  net Partial Liquidation  Proceeds
with respect to Mortgage Loans will result from the priority of distributions of
the Pool Distribution Amount first to the holders of the Senior Certificates and
then   to  the  Class   M  Certificateholders  as   described  above  under  "--
Distributions."
 
                                      S-52
<PAGE>
    The allocation of the principal portion of Realized 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 Principal
Balance and  Class AP  Principal Balance  such that  (i) the  Class A  Principal
Balance  equals the Adjusted Pool Amount less the Adjusted Pool Amount (Class AP
Portion) as of the preceding Distribution  Date and (ii) the Class AP  Principal
Balance  equals the Adjusted Pool Amount (Class  AP Portion) as of the preceding
Distribution Date. The principal  portion of such  Realized Losses allocated  to
the  Class A  Certificates will  be allocated  to the  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 pro  rata  in accordance  with  their respective  Class A
Subclass Interest 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 and Classes of the Class A, Class M and
Class  B Certificates pro rata based  on their outstanding principal balances in
proportion to the Classes A/M/B  Fraction of such losses  and (b) in respect  of
Discount Mortgage Loans, to the Class AP Certificates in proportion to the Class
AP 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. (Any such losses so allocated to the Class A 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
with respect to the principal portion of such losses and their Class A  Subclass
Interest  Accrual  Amounts  without regard  to  any reduction  pursuant  to this
sentence, with respect  to the interest  portion of such  losses, and among  the
outstanding  Class A  Certificates within each  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 Senior
Certificates  on a particular Distribution Date  (other than any portion thereof
representing the  difference between  the Class  A Percentage  of the  Scheduled
Principal  Balances of Liquidated Loans and the Class A Prepayment Percentage of
such amounts), then the percentage of  principal payments on the Mortgage  Loans
to  which the holders  of the Class  A 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 Class B Certificates, 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  (i) among the
Class A, Class M  and Class B  Certificates and (ii) to  the extent such  Excess
Special  Hazard Losses arise with respect  to Discount Mortgage Loans, the Class
AP 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
 
                                      S-53
<PAGE>
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  199 -  Certificates, the  "Special Hazard  Loss
Amount"  with respect thereto will be equal to approximately    % (approximately
$      ) 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 (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  on the  Class A,  Class AP  and Class  M Certificates,  as evidenced by
letters to that  effect delivered by  [Moody's] [Fitch] [DCR]  and [S&P] to  the
Master  Servicer and the Trustee. 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  Class B Certificates, 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 (i) among the Class  A, Class M and Class  B Certificates and (ii)  to
the  extent such  Excess Fraud  Losses arise  with respect  to Discount Mortgage
Loans, the Class AP 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
199 - Certificates, the "Fraud Loss  Amount" with respect thereto will be  equal
to  approximately     % (approximately $        ) 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 Class B  Certificates, 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 (i) among the  Class A, Class M and Class B
Certificates and (ii)  to the extent  such Excess Bankruptcy  Losses arise  with
respect  to Discount Mortgage Loans, the Class AP 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
 
                                      S-54
<PAGE>
"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  199  -
Certificates, the "Bankruptcy Loss Amount" with respect thereto will be equal to
approximately     %  (approximately $         )  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 and  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 or Class M Certificates since such
anniversary.  The  Bankruptcy  Loss  Amount  and  the  related  coverage  levels
described  above  may  be reduced  or  modified upon  written  confirmation from
[Moody's] [Fitch] [DCR] and [S&P] that  such reduction or modification will  not
adversely  affect the then-current ratings assigned to the Class A, Class AP and
Class M Certificates by [Moody's] [Fitch]  [DCR] and [S&P]. 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 Trustee 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  initial principal  balance of  the Class  B Certificates  in  the
aggregate  will be approximately $         ,  the risk of Special Hazard Losses,
Fraud Losses  and Bankruptcy  Losses will  be separately  borne by  the Class  B
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 they will bear to the full extent of their
initial  principal  balance.  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  of
approximately        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           promissory notes, to have an aggregate unpaid
principal balance as of the Cut-Off Date (the "Cut-Off Date Aggregate  Principal
Balance")  of  approximately $              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       of the Mortgage Loans  in
the  Trust Estate, representing approximately    % of the Cut-Off Date Aggregate
Principal Balance of the Mortgage Loans will be secured by Co-op Shares and that
     of the Mortgage Loans, representing approximately    % of the Cut-Off  Date
Aggregate  Principal Balance of the Mortgage  Loans, will be Buy-Down Loans. 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.
 
    As  of the Cut-Off  Date, each Mortgage  Loan is expected  to have an unpaid
principal balance  of not  less than  approximately $              or more  than
approximately  $            ,  and the  average unpaid principal  balance of the
Mortgage Loans is expected to  be approximately $           . The latest  stated
maturity date of any of the Mortgage Loans is expected to be             ,     ;
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,         of the Mortgaged  Properties, which  secure
approximately       % of  the Cut-Off  Date Aggregate  Principal Balance  of the
Mortgage Loans, are expected to be owner occupied primary residences and      of
the Mortgaged
 
- ------------------------
(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 199 - 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
    199 -  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>
Properties,  which  secure approximately       % of  the Cut-Off  Date Aggregate
Principal Balance of the Mortgage Loans,  are expected to be non-owner  occupied
or  second homes. See "The Mortgage Loan Programs -- Mortgage Loan Underwriting"
in the Prospectus.
 
    It is expected  that one  of the Mortgage  Loans representing  approximately
   %  of the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans will
be  subject  to  a  subsidy  agreement,  which,  except  under  certain  limited
circumstances,  requires the employer of the mortgagor  to make a portion of the
payments on the related Mortgage Loans (a "Subsidy Loan") for specified periods.
The Subsidy Loan  was underwritten  by Norwest Mortgage.  The subsidy  agreement
relating  to the Subsidy Loan generally  will provide that monthly payments made
by the related  mortgagor will be  less than the  scheduled monthly payments  on
such  Mortgage  Loans, with  the present  value of  the resulting  difference in
payments being provided by the employer  of the mortgagor in advance,  generally
on  an annual  basis. Subsidy Loans  are offered by  employers generally through
either a graduated or fixed subsidy loan program, or a combination thereof.  The
effective  subsidized rates under  the various programs  offered generally range
from one to  five percentage  points below the  interest rate  specified in  the
related  mortgage  note.  These  subsidized  rates  are  used  to  calculate the
applicable debt-to-income ratios that are used to evaluate the  creditworthiness
of  prospective  borrowers. This  procedure  may enable  certain  mortgagors who
otherwise would not  meet Norwest Mortgage's  underwriting guidelines to  obtain
mortgage  loans. As of the Cut-Off Date, it is expected that the Subsidy Loan in
the Trust Estate will be offered by an employer through a graduated subsidy loan
program  with  a  term  of  five  years  or  less.  See  "Prepayment  and  Yield
Considerations" herein.
 
    Subsidy amounts paid by the employer will be deposited by the Servicer in an
account  (the "Subsidy Account")  maintained by the Servicer,  which will not be
part of the Trust Estate or the REMIC. Funds in the Subsidy Account with respect
to each Subsidy  Loan will be  withdrawn by  the Servicer and  deposited in  the
Servicer  Custodial Account  on the  business day  following the  receipt by the
Servicer of the mortgagor's monthly payment to which such funds relate. Funds in
the Subsidy Account with respect to a Subsidy Loan will not be withdrawn by  the
Servicer,  and  are  not  permitted  to be  applied  under  the  related subsidy
agreement, during any period in which  such Subsidy Loan is in default.  Despite
the  existence of the subsidy agreement, the mortgagor remains liable for making
all scheduled payments on  a Subsidy Loan.  From time to time,  the amount of  a
subsidy  payment or the term  of a subsidy agreement may,  upon the request of a
corporate employer, be modified.
 
    As of the Cut-Off  Date, there were     Mortgage  Loans having an  aggregate
unpaid  principal balance  of approximately  $             ,  a range  of unpaid
principal balances of approximately $          to approximately $          ,  an
average  unpaid principal  balance of  approximately $             ,  a range of
interest rates from    % to    % per annum, a weighted average interest rate  of
approximately     % per annum, a  range of remaining terms to stated maturity of
   months to    months, a weighted average remaining term to stated maturity  of
approximately     months,  a range of original  Loan-to-Value Ratios of     % to
   %, a weighted average original Loan-to-Value Ratio of approximately    %  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          % in [STATES].
 
    As of the  Cut-Off Date, there  were             Mortgage  Loans other  than
Discount  Mortgage  Loans  having  an  aggregate  unpaid  principal  balance  of
approximately $         , a range of unpaid principal balances of  approximately
$           to approximately $          , an average unpaid principal balance of
approximately $         , a range of interest rates from    % to    % per annum,
a weighted average interest  rate of approximately     % per  annum, a range  of
remaining terms to stated maturity of    months to    months, a weighted average
remaining  term  to stated  maturity  of approximately       months, a  range of
original Loan-to-Value Ratios  of     %  to     %, a  weighted average  original
Loan-to-Value  Ratio  of  approximately        %  and  the  following geographic
concentration of Mortgaged Properties securing Mortgage Loans in excess of 5.00%
of the  aggregate unpaid  principal balance  of the  Mortgage Loans  other  than
Discount Mortgage Loans: approximately    % in [STATES].
 
                                      S-57
<PAGE>
    The  Mortgage Loans have been acquired  by the Seller from Norwest Mortgage.
The Mortgage Loans  that Norwest  Mortgage sells to  the Seller  will have  been
either  originated  by Norwest  Mortgage or  acquired  by Norwest  Mortgage from
various entities (each, a "Correspondent") which either originated the  Mortgage
Loans or acquired the Mortgage Loans pursuant to mortgage loan purchase programs
operated  by such Correspondents. Approximately     % (by Cut-Off Date Aggregate
Principal Balance) of  the Mortgage  Loans (the  "Norwest Mortgage  Underwritten
Loans")   were  generally  originated  in  conformity  with  Norwest  Mortgage's
underwriting standards  applied  either  by  Norwest  Mortgage  or  by  eligible
originators  to whom Norwest Mortgage  had delegated all underwriting functions.
In certain instances,  exceptions to Norwest  Mortgage's underwriting  standards
may have been granted by Norwest Mortgage to such originators. See "The Mortgage
Loan  Programs -- Mortgage  Loan Underwriting" in  the Prospectus. Approximately
   % and     %  (by Cut-Off Date  Aggregate Principal Balance)  of the  Mortgage
Loans  (the "Pool Certification Underwritten Loans")  will have been reviewed by
GEMICO and UGRIC, respectively, to ensure compliance with such company's credit,
appraisal and underwriting standards. Neither the Series 199 - Certificates  nor
the  Mortgage Loans  are insured or  guaranteed under a  mortgage pool insurance
policy issued by GEMICO or UGRIC. The Pool Certification Underwritten Loans were
evaluated  by  Norwest  Mortgage  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 by  Norwest Mortgage. The  remaining approximate     %  (by
Cut-Off  Date  Aggregate Principal  Balance) of  the  Mortgage Loans  (the "Bulk
Purchase  Underwritten  Loans")  will  have  been  underwritten  under   varying
standards which have been reviewed and accepted by Norwest Mortgage. Neither the
Seller   nor  Norwest  Mortgage  has  underwritten  any  of  the  Bulk  Purchase
Underwritten Loans.  See "--  Mortgage Underwriting  Standards" below  and  "The
Mortgage Loan Programs -- Mortgage Loan Underwriting" in the Prospectus.
 
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
                                                                                                  CUT-OFF DATE
                                                                 NUMBER      AGGREGATE UNPAID      AGGREGATE
                                                              OF MORTGAGE       PRINCIPAL          PRINCIPAL
MORTGAGE INTEREST RATE                                           LOANS           BALANCE            BALANCE
- -----------------------------------------------------------  --------------  ----------------  ------------------
 
<S>                                                          <C>             <C>               <C>
</TABLE>
 
    As  of the Cut-Off Date, the weighted  average Mortgage Interest Rate of the
Mortgage Loans is  expected to be  approximately          %  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 as  set forth  in the
Pooling and Servicing Agreement  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        % per
annum.
 
                                      S-58
<PAGE>
                       REMAINING TERMS TO STATED MATURITY
 
<TABLE>
<CAPTION>
                                                                                                 PERCENTAGE OF
                                                                                                  CUT-OFF DATE
                                                                 NUMBER      AGGREGATE UNPAID      AGGREGATE
                                                              OF MORTGAGE       PRINCIPAL          PRINCIPAL
              REMAINING STATED TERM (MONTHS)                     LOANS           BALANCE            BALANCE
- -----------------------------------------------------------  --------------  ----------------  ------------------
 
<S>                                                          <C>             <C>               <C>
</TABLE>
 
    As of  the Cut-Off  Date,  the weighted  average  remaining term  to  stated
maturity of the Mortgage Loans is expected to be approximately    months.
 
                              YEARS OF ORIGINATION
 
<TABLE>
<CAPTION>
                                                                                                 PERCENTAGE OF
                                                                                                  CUT-OFF DATE
                                                                 NUMBER      AGGREGATE UNPAID      AGGREGATE
                                                              OF MORTGAGE       PRINCIPAL          PRINCIPAL
YEAR OF ORIGINATION                                              LOANS           BALANCE            BALANCE
- -----------------------------------------------------------  --------------  ----------------  ------------------
 
<S>                                                          <C>             <C>               <C>
</TABLE>
 
    It  is  expected that  the earliest  month  and year  of origination  of any
Mortgage Loan was           and  the latest  month and year  of origination  was
         .
 
                         ORIGINAL LOAN-TO-VALUE RATIOS
 
<TABLE>
<CAPTION>
                                                                                                 PERCENTAGE OF
                                                                                                  CUT-OFF DATE
                                                                 NUMBER      AGGREGATE UNPAID      AGGREGATE
                                                              OF MORTGAGE       PRINCIPAL          PRINCIPAL
ORIGINAL LOAN-TO-VALUE RATIO                                     LOANS           BALANCE            BALANCE
- -----------------------------------------------------------  --------------  ----------------  ------------------
 
<S>                                                          <C>             <C>               <C>
</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       % and        %,
respectively, and the weighted average Loan-to-Value Ratio at origination of the
Mortgage  Loans is expected to be approximately    %. 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 of the Mortgage Loans
having Loan-to-Value  Ratios  at  origination in  excess  of  80%,  representing
approximately    % (by Cut-Off Date Aggregate Principal Balance) of the Mortgage
Loans, were originated without primary mortgage insurance.
 
                                      S-59
<PAGE>
                       MORTGAGE LOAN DOCUMENTATION LEVELS
 
<TABLE>
<CAPTION>
                                                                                                 PERCENTAGE OF
                                                                                                  CUT-OFF DATE
                                                                 NUMBER      AGGREGATE UNPAID      AGGREGATE
                                                              OF MORTGAGE       PRINCIPAL          PRINCIPAL
DOCUMENTATION LEVEL                                              LOANS           BALANCE            BALANCE
- -----------------------------------------------------------  --------------  ----------------  ------------------
 
<S>                                                          <C>             <C>               <C>
</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."
 
                   ORIGINAL MORTGAGE LOAN PRINCIPAL BALANCES
 
<TABLE>
<CAPTION>
                                                                                                 PERCENTAGE OF
                                                                                                  CUT-OFF DATE
                                                                 NUMBER      AGGREGATE UNPAID      AGGREGATE
                                                              OF MORTGAGE       PRINCIPAL          PRINCIPAL
ORIGINAL MORTGAGE LOAN PRINCIPAL BALANCE                         LOANS           BALANCE            BALANCE
- -----------------------------------------------------------  --------------  ----------------  ------------------
 
<S>                                                          <C>             <C>               <C>
</TABLE>
 
    As of the Cut-Off Date, the average unpaid principal balance of the Mortgage
Loans is expected to be approximately $           . 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    %
and      %, respectively.  See  "The Trust  Estates --  Mortgage Loans"  in  the
Prospectus.
 
                              MORTGAGED PROPERTIES
 
<TABLE>
<CAPTION>
                                                                                                 PERCENTAGE OF
                                                                                                  CUT-OFF DATE
                                                                 NUMBER      AGGREGATE UNPAID      AGGREGATE
                                                              OF MORTGAGE       PRINCIPAL          PRINCIPAL
PROPERTY                                                         LOANS           BALANCE            BALANCE
- -----------------------------------------------------------  --------------  ----------------  ------------------
 
<S>                                                          <C>             <C>               <C>
</TABLE>
 
                GEOGRAPHIC DISTRIBUTION OF MORTGAGED PROPERTIES
 
<TABLE>
<CAPTION>
                                                                                                    PERCENTAGE OF
                                                                  NUMBER       AGGREGATE UNPAID      CUT-OFF DATE
                                                                OF MORTGAGE       PRINCIPAL      AGGREGATE PRINCIPAL
GEOGRAPHIC AREA                                                    LOANS           BALANCE             BALANCE
- ------------------------------------------------------------  ---------------  ----------------  --------------------
 
<S>                                                           <C>              <C>               <C>
</TABLE>
 
                                      S-60
<PAGE>
    No  more than  approximately     %  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.
 
                         ORIGINATORS OF MORTGAGE LOANS
 
<TABLE>
<CAPTION>
                                                                                                    PERCENTAGE OF
                                                                  NUMBER       AGGREGATE UNPAID      CUT-OFF DATE
                                                                OF MORTGAGE       PRINCIPAL      AGGREGATE PRINCIPAL
ORIGINATOR                                                         LOANS           BALANCE             BALANCE
- ------------------------------------------------------------  ---------------  ----------------  --------------------
 
<S>                                                           <C>              <C>               <C>
</TABLE>
 
    It  is expected that, as of the Mortgage Loan Cut-off Date,               of
the "Other  Originators" will  have accounted  for approximately      %  of  the
Mortgage  Loan 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
                                                                  NUMBER       AGGREGATE UNPAID      CUT-OFF DATE
                                                                OF MORTGAGE       PRINCIPAL      AGGREGATE PRINCIPAL
LOAN PURPOSE                                                       LOANS           BALANCE             BALANCE
- ------------------------------------------------------------  ---------------  ----------------  --------------------
 
<S>                                                           <C>              <C>               <C>
</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.
 
                             SUBSIDY LOAN PROGRAMS
 
<TABLE>
<CAPTION>
                                                                                                    PERCENTAGE OF
                                                                  NUMBER       AGGREGATE UNPAID      CUT-OFF DATE
                                                                OF MORTGAGE       PRINCIPAL      AGGREGATE PRINCIPAL
PROGRAM AND TERM                                                   LOANS           BALANCE             BALANCE
- ------------------------------------------------------------  ---------------  ----------------  --------------------
 
<S>                                                           <C>              <C>               <C>
</TABLE>
 
                                      S-61
<PAGE>
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 199  -
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
 
    The  [Master Servicer][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 by a borrower
meeting Norwest Mortgage's underwriting guidelines 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.
 
MORTGAGE UNDERWRITING STANDARDS
 
    Approximately       % (by  Cut-Off Date Aggregate  Principal Balance) of the
Mortgage Loans  (the  "Norwest  Mortgage  Underwritten  Loans")  were  generally
originated  in conformity with Norwest Mortgage's underwriting standards. In the
case of certain Mortgage Loans underwritten pursuant to a Delegated Underwriting
(as defined in the Prospectus under "The Mortgage Loan Programs -- Mortgage Loan
Underwriting")  arrangement,  exceptions  to  Norwest  Mortgage's   underwriting
standards  may have  been approved by  Norwest Mortgage. See  "The Mortgage Loan
Programs -- Mortgage Loan Underwriting" in the Prospectus.
 
    Approximately     % and     % (by Cut-Off Date Aggregate Principal  Balance)
of the Mortgage Loans will have been reviewed by GEMICO and UGRIC, respectively,
to  ensure  compliance  with  such company's  respective  credit,  appraisal and
underwriting standards  generally to  assess the  eligibility of  such  Mortgage
Loans  for inclusion in a mortgage pool to  be insured by such company. See "The
Mortgage Loan Programs -- Mortgage Loan Underwriting" in the Prospectus.
 
    Neither the Series 199 - Certificates nor the Mortgage Loans are insured  or
guaranteed under a mortgage pool insurance policy issued by GEMICO or UGRIC.
 
    The Pool Certification Underwritten Loans were evaluated by Norwest Mortgage
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  by Norwest
Mortgage.
 
    [The remaining  approximate        % (by  Cut-Off Date  Aggregate  Principal
Balance)  of the  Mortgage Loans (the  "Bulk Purchase  Underwritten Loans") will
have been underwritten  under varying  standards. Norwest Mortgage  has in  each
case  reviewed the underwriting  standards applied and  determined that the Bulk
Purchase Underwritten Loans would have  qualified for origination under  Norwest
Mortgage's  underwriting standards together  with customary exceptions therefrom
reflecting the exercise of underwriting discretion. Any such exceptions did  not
constitute material departures from Norwest Mortgage's underwriting standards.]
 
                                      S-62
<PAGE>
            NORWEST MORTGAGE DELINQUENCY AND FORECLOSURE EXPERIENCE
 
    The  following  tables  set  forth  certain  information  concerning  recent
delinquency, foreclosure and loan loss  experience on the conventional  mortgage
loans  included in  Norwest Mortgage's  mortgage loan  servicing portfolio which
were originated by Norwest Mortgage for its own account or for the account of an
affiliate or acquired by Norwest Mortgage for its own account or for the account
of an affiliate  and underwritten to  Norwest Mortgage's underwriting  standards
(the  "Program  Loans"), on  the  Program Loans  which  are fixed  interest rate
mortgage loans ("Fixed Program Loans"), including, in both cases, mortgage loans
originated in connection with the purchases of residences by relocated employees
("Relocation Mortgage Loans")  and on  the Fixed  Program Loans  other than  the
Relocation   Mortgage   Loans  ("Fixed   Non-relocation  Program   Loans").  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. There
can be no assurance that the  delinquency, foreclosure and loan loss  experience
set  forth  with  respect to  Norwest  Mortgage's total  servicing  portfolio of
Program Loans, which includes 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  Norwest
Mortgage's  servicing portfolios of Fixed  Program Loans or Fixed Non-relocation
Program 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.  Furthermore,  there can  be no
assurance that the  future experience  on the  Mortgage Loans  generally or  the
Mortgage  Loans serviced  by Norwest Mortgage,  all of which  are fixed interest
rate mortgage loans  having original terms  to stated maturity  of       months,
approximately      % (by Cut-Off  Date Aggregate Principal Balance) of which are
serviced by Other Servicers and approximately      % (by Cut-Off Date  Aggregate
Principal  Balance)  of  which  were  underwritten  to  various  pool  insurers'
standards will be comparable to that of the total Program Loans or Fixed Program
Loans.
 
    Historically, Relocation  Mortgage  Loans, which  constitute  a  significant
percentage  of the Mortgage  Loans currently serviced  by Norwest Mortgage, have
experienced a significantly lower rate of delinquency and foreclosure than other
mortgage loans  included in  the portfolios  of total  Program Loans  and  Fixed
Program  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 of approximately
    years and none of which are Relocation Mortgage Loans, will be comparable to
that of  the  total  Program  Loans,  the  Fixed  Program  Loans  or  the  Fixed
Non-relocation Program Loans.
 
    The  following tables reflect rapid growth  during recent periods in Norwest
Mortgage's mortgage loan servicing  portfolio as a  result of the  substantially
higher  volume of new loan originations  and acquisitions of recently originated
mortgage 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 Norwest Mortgage's
total servicing portfolio could rise significantly above the rates indicated  in
the following tables.
 
                                      S-63
<PAGE>
                              TOTAL PROGRAM 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, 1993        DECEMBER 31, 1994        DECEMBER 31 1995
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Total Portfolio of
 Program Loans...........               $                        $                        $
 
Period of Delinquency (1)
  30 to 59 days..........               $                        $                        $
  60 to 89 days..........
  90 days or more........
Total Delinquent Loans...               $                        $                        $
 
Percent of Portfolio.....            %           %            %           %            %           %
 
<CAPTION>
 
                                    AS OF                    AS OF                    AS OF
                              DECEMBER 31, 199         DECEMBER 31, 199         DECEMBER 31, 1995
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Foreclosures (2).........               $                        $                        $
Foreclosure Ratio (3)....            %                        %                        %
<CAPTION>
                                 YEAR ENDED               YEAR ENDED               YEAR ENDED
                              DECEMBER 31, 199         DECEMBER 31, 199         DECEMBER 31, 1995
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Net Gain (Loss) (4)......               ($        )              ($        )              ($        )
Net Gain (Loss) Ratio
 (5).....................           (%)                      (%)                      (%)
</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 PROGRAM 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, 199         DECEMBER 31, 199            JUNE 30 199
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Total Portfolio of Fixed
 Program Loans...........               $                        $                        $
 
Period of Delinquency (1)
  30 to 59 days..........               $                        $                        $
  60 to 89 days..........
  90 days or more........
Total Delinquent Loans...               $                        $                        $
 
Percent of Fixed Program
 Loan Portfolio..........            %           %            %           %            %           %
 
<CAPTION>
 
                                    AS OF                    AS OF                    AS OF
                              DECEMBER 31, 199         DECEMBER 31, 199           JUNE 30, 199
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Foreclosures (2).........               $                        $                        $
Foreclosure Ratio (3)....            %                        %                        %
<CAPTION>
                                 YEAR ENDED               YEAR ENDED            SIX MONTHS ENDED
                              DECEMBER 31, 199         DECEMBER 31, 199           JUNE 30, 199
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Net Gain (Loss) (4)......               $                        $                        $
Net Gain (Loss) Ratio
 (5).....................            %                        %                        %
</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-65
<PAGE>
                       FIXED NON-RELOCATION PROGRAM 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, 199         DECEMBER 31, 199           JUNE 30, 199
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Total Portfolio of Fixed
 Non-relocation Program
 Loans...................               $                        $                        $
 
Period of Delinquency (1)
  30 to 59 days..........               $                        $                        $
  60 to 89 days..........
  90 days or more........
Total Delinquent Loans...               $                        $                        $
 
Percent of Fixed Non-
 relocation Program Loan
 Portfolio...............            %            %           %            %           %            %
 
<CAPTION>
 
                                    AS OF                    AS OF                    AS OF
                              DECEMBER 31, 199         DECEMBER 31, 199           JUNE 30, 199
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Foreclosures (2).........               $                        $                        $
Foreclosure Ratio (3)....            %                        %                        %
<CAPTION>
 
                                 YEAR ENDED               YEAR ENDED            SIX MONTHS ENDED
                              DECEMBER 31, 199         DECEMBER 31, 199           JUNE 30, 199
                           -----------------------  -----------------------  -----------------------
                                                 (DOLLAR AMOUNTS IN THOUSANDS)
<S>                        <C>          <C>         <C>          <C>         <C>          <C>
Net Gain (Loss) (4)......               $                        $                        $
Net Gain (Loss) Ratio
 (5).....................            %                        %                        %
</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-66
<PAGE>
    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.
 
                      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 Representing Party
of Mortgage  Loans  as  a  result of  defective  documentation  or  breaches  of
representations and warranties and optional purchases by Norwest Mortgage 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  Classes A/M/B Fraction, to the holders  of
the  Class A 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 AP Certificates in proportion to the interest of the
Class AP Certificates in such Discount Mortgage Loan represented by the Class AP
Fraction. 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
 
                                      S-67
<PAGE>
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 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.
 
    The  effect of subsidy agreements on the rate of prepayment of Subsidy Loans
is uncertain. The rate of  prepayment on Subsidy Loans  may be affected by  such
factors  as the relationship between prevailing mortgage rates and the effective
interest rates  on  such  Subsidy  Loans, the  remaining  term  of  the  subsidy
agreements, and requests by the related employers for refinance or modification.
The  subsidy agreement  relating to  a Subsidy  Loan generally  provides that if
prevailing market rates of  interest on mortgage loans  similar to such  Subsidy
Loan  decline relative to the Mortgage Interest Rate of such Subsidy Loan by the
percentage set forth in the subsidy agreement, the employer may request that the
mortgagor refinance such  Subsidy Loan.  In the event  the mortgagor  refinances
such  Subsidy Loan, the Subsidy Loan will be  prepaid, and the new loan will not
be included  in the  Trust Estate.  If  the mortgagor  fails to  refinance  such
Subsidy  Loan,  the employer  may terminate  the  related subsidy  agreement. In
addition, the termination of  the subsidy agreement relating  to a Subsidy  Loan
for  any  reason  (whether  due  to  the  mortgagor's  failure  to  refinance or
otherwise) may increase the financial burden of the mortgagor, who may not  have
otherwise  qualified  for  a  mortgage under  Norwest  Mortgage's  mortgage loan
underwriting guidelines, and may consequently increase the risk of default  with
respect  to the related Mortgage Loan. See "The Trust Estates -- Mortgage Loans"
and  "The  Mortgage  Loan  Programs  --  Mortgage  Loan  Underwriting"  in   the
Prospectus.  From time to time, the amount of the subsidy payment or the term of
the subsidy  agreement may,  upon  the request  of  the corporate  employer,  be
modified.
 
    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,
 
                                      S-68
<PAGE>
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)  the  Servicer  elects  to  encourage the
refinancing of any defaulted Mortgage Loan  rather than to permit an  assumption
thereof  by  a mortgagor  meeting  the Servicer's  underwriting  guidelines. 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  199 - 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 AP 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. 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 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  AP
CERTIFICATES WILL BE  INFLUENCED BY  PRINCIPAL PAYMENTS SOLELY  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.
 
    The  yield to maturity  on the Class  M Certificates will  be more sensitive
than the yield to maturity on the Senior 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  Senior  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 Senior 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 Senior Certificates.
 
    The  yield to maturity on the  Offered Certificates and more particularly on
the Class M Certificates may be affected by the geographic concentration of  the
Mortgaged  Properties securing the Mortgage Loans,  and the yield to maturity on
the Class  AP  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  and  floods,  which  may  adversely  affect  property  values.  Any
deterioration  in housing prices in California, as well  as              and the
other  states  in  which   the  Mortgaged  Properties   are  located,  and   any
deterioration of economic conditions in such states which
 
                                      S-69
<PAGE>
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.
 
    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 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 are 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 AP Certificates, the risk that a slower than  anticipated
rate of principal payments on the Mortgage Loans, or in the case of the Class AP
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 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 AP 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
Certificateholder's 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 Certificate 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 CERTIFICATE MAY BE SIGNIFICANTLY  LOWER THAN WOULD BE THE CASE IF
THE CLASS A-R CERTIFICATE WERE TAXED AS A DEBT INSTRUMENT, OR MAY BE NEGATIVE.
 
    As referred to herein, the weighted average  life of a Subclass or Class  of
the  Offered Certificates 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 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.
 
    THE WEIGHTED  AVERAGE LIFE  OF  THE COMPANION  CERTIFICATES WILL  BE  HIGHLY
SENSITIVE  TO  THE RATE  OF PRINCIPAL  PAYMENTS  (INCLUDING PREPAYMENTS)  ON THE
MORTGAGE LOANS.  Specifically, if  prepayments  result in  a Class  A  Principal
Amount  equal to or  less than the sum  of the PAC Principal  Amount and the TAC
Principal Amount  on  any Distribution  Date,  the Companion  Certificates  will
receive  no distributions in  reduction of principal  on such Distribution Date.
Further, on each Distribution Date up  to an including the Distribution Date  on
which  the Class A  Subclass Principal Balance of  the Companion Certificates is
reduced to zero, any Excess Principal  Payments for such Distribution Date  will
be
 
                                      S-70
<PAGE>
applied  to  the  Companion Certificates  before  being distributed  to  the TAC
Certificates and  the PAC  Certificates in  the proportions  and priorities  set
forth  above  under "Description  of  the Certificates  --  Principal (Including
Prepayments)." See  "Description of  the  Certificates --  Principal  (Including
Prepayments)  -- Principal Payment Characteristics  of the PAC Certificates, the
TAC Certificates and the Companion Certificates."
 
    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  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,  "     %  SPA" assumes
prepayment rates equal to    % of SPA, and so forth. 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, that (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
              199  , (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  Norwest Mortgage 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                199 at the
respective constant percentages of SPA set forth in the tables and there are  no
partial  principal prepayments or Prepayment Interest Shortfalls, (v) the Series
199 Certificates will be issued on               , 199 and (vi) distributions to
Certificateholders will be  made on the  25th day of  each month, commencing  in
199  . 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,  initial principal balances  of the Class  AP and Class  M
Certificates,  the actual  weighted average lives  of the Subclasses  of Class A
Certificates and the Class AP and Class M Certificates and the date on which the
Class A Subclass Principal Balance of  any Subclass of Class A Certificates  and
the  principal balances of the Class AP  and Class M 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 such Subclass and, in the case of the Class AP and Class M Certificates, of
the  initial principal balances  of the Class  AP and Class  M Certificates that
would be outstanding after  each of the dates  shown at constant percentages  of
SPA presented.
 
                                      S-71
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                               CLASS A-1                                              CLASS A-2
                                          CERTIFICATES AT THE                                    CERTIFICATES AT THE
                                         FOLLOWING PERCENTAGES                                  FOLLOWING PERCENTAGES
                                                OF SPA                                                 OF SPA
              ---------------------------------------------------------------------------  -------------------------------
 
DISTRIBUTION
    DATE         0%          %          %          %          %          %          %         0%          %          %
<S>           <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
 
<CAPTION>
DISTRIBUTION
    DATE          %          %          %          %
<S>           <C>        <C>        <C>        <C>
</TABLE>
 
- ------------------------------
(1)  The  weighted average life  of an Offered Certificate  is determined by (i)
     multiplying the  amount  of each  distribution  in 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  distributions in  reduction of
     principal balance referred to in clause (i).
 
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                               CLASS A-3                                              CLASS A-4
                                          CERTIFICATES AT THE                                    CERTIFICATES AT THE
                                         FOLLOWING PERCENTAGES                                  FOLLOWING PERCENTAGES
                                                OF SPA                                                 OF SPA
              ---------------------------------------------------------------------------  -------------------------------
 
DISTRIBUTION
    DATE         0%          %          %          %          %          %          %         0%          %          %
<S>           <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
 
<CAPTION>
DISTRIBUTION
    DATE          %          %          %          %
<S>           <C>        <C>        <C>        <C>
</TABLE>
 
- ------------------------------
(1)  The weighted average life  of an Offered Certificate  is determined by  (i)
     multiplying  the  amount of  each  distribution in  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  distributions in  reduction  of
     principal balance referred to in clause (i).
 
                                      S-72
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                               CLASS A-5                                              CLASS A-R
                                          CERTIFICATES AT THE                                    CERTIFICATE AT THE
                                         FOLLOWING PERCENTAGES                                  FOLLOWING PERCENTAGES
                                                OF SPA                                                 OF SPA
              ---------------------------------------------------------------------------  -------------------------------
 
DISTRIBUTION
    DATE         0%          %          %          %          %          %          %         0%          %          %
<S>           <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
 
<CAPTION>
DISTRIBUTION
    DATE          %          %          %          %
<S>           <C>        <C>        <C>        <C>
</TABLE>
 
- ------------------------------
(1)  The  weighted average life  of an Offered Certificate  is determined by (i)
     multiplying the  amount  of each  distribution  in 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  distributions in  reduction of
     principal balance referred to in clause (i).
 
    Interest accrued on the Class A and Class M 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 Certificates and the Class M 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 Classes 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 assumptions  set
forth  in  clauses (i)  through (vii)  of the  first full  paragraph on  page S-
hereof. 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 AP CERTIFICATES
 
    THE  YIELD  TO AN  INVESTOR  IN THE  CLASS  AP CERTIFICATES  WILL  BE HIGHLY
SENSITIVE TO THE RATE AND  TIMING OF PRINCIPAL PAYMENTS (INCLUDING  PREPAYMENTS)
OF 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 AP 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  AP CERTIFICATES  THAN WOULD  BE THE  CASE IF  THE DISCOUNT
MORTGAGE LOANS PREPAID AT THE SAME RATE AS THE OTHER MORTGAGE LOANS.
 
                                      S-73
<PAGE>
    The following table indicates the sensitivity to various rates of prepayment
on the Discount Mortgage Loans of the pre-tax yields to maturity on a  corporate
bond  equivalent ("CBE") basis  of the Class  AP Certificates. Such calculations
are  based  on  distributions  made  in  accordance  with  "Description  of  the
Certificates"  above, on the assumptions described  in clauses (i) through (vii)
of the first full paragraph on page  S- and on the further assumptions that  (i)
the  Class AP Certificates  will be purchased  on                    , 199 at an
aggregate purchase price of    %  of the initial Class AP Principal Balance  and
(ii)  distributions to holders of the Class  AP Certificates will be made on the
25th day of each month commencing in               199 .
 
  SENSITIVITY OF THE PRE-TAX YIELD ON THE CLASS AP CERTIFICATES TO PREPAYMENTS
 
<TABLE>
<CAPTION>
                                                         PERCENTAGES OF SPA
                                --------------------------------------------------------------------
 
                                   0%        %         %         %         %         %         %
                                --------  --------  --------  --------  --------  --------  --------
<S>                             <C>       <C>       <C>       <C>       <C>       <C>       <C>
Pre-Tax Yield (CBE)...........          %         %         %         %         %         %         %
</TABLE>
 
    The pre-tax yields 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 AP  Certificates,  would  cause the
discounted present  value of  such assumed  stream  of cash  flows to  equal  an
assumed  aggregate purchase price for the Class AP Certificates of approximately
   % of the initial Class AP 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 AP Certificates and consequently
does not  purport to  reflect  the return  on any  investment  in the  Class  AP
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  OR THAT ALL  OF THE DISCOUNT  MORTGAGE LOANS WILL
PREPAY AT THE SAME RATE. 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 on the Class AP
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.
 
                        POOLING AND SERVICING AGREEMENT
GENERAL
 
    The Series  199 -  Certificates will  be issued  pursuant to  a Pooling  and
Servicing Agreement to be dated as of the date of initial issuance of the Series
199 - Certificates (the "Pooling and Servicing Agreement") among the Seller, the
Master  Servicer  and  the Trustee.  Reference  is  made to  the  Prospectus for
important additional  information  regarding the  terms  and conditions  of  the
Pooling  and Underlying Servicing  Agreement and the  Series 199 - 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, (iv)  the rights of  the Trustee  to receive the
proceeds of all insurance policies and performance bonds, if any, required to be
maintained pursuant to the Pooling  and Servicing Agreement, (v) certain  rights
of  the Seller to the enforcement of  representations and warranties made by the
Representing Parties relating to the Mortgage Loans, and (vi) the rights of  the
Trustee under the Norwest Mortgage Loan Purchase Agreement.
 
                                      S-74
<PAGE>
DISTRIBUTIONS
 
    Distributions  (other than the final distribution in retirement of the Class
A Certificates of each 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 any  holder of  a Class  A Certificate  evidencing at  least  a
$5,000,000  initial principal balance  or any holder  of a Class  AP, Class M or
Offered Class B Certificate evidencing a 100% Percentage Interest, 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 Subclass of Offered Certificates
will  be made only upon presentation and surrender of the related Certificate at
the office or agency appointed by the  Trustee 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, the Trustee and the  Master Servicer 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 Trustee
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
199 - 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  199 - Certificates  equal to the  product of (i) the
then applicable Class A Percentage and  (ii) the ratio obtained by dividing  the
Pool  Balance (Classes A/M/B  Portion) by the  sum of the  Pool Balance (Classes
A/M/B Portion)  and the  Pool Balance  (Class AP  Portion) (the  "Classes  A/M/B
Voting Interest"); the holders of the Class AP Certificates will collectively be
entitled  to a  percentage of the  aggregate Voting Interest  represented by all
Series 199 - Certificates equal to the percentage obtained by dividing the  Pool
Balance  (Class AP Portion) by the sum of the Pool Balance (Class A/M/B Portion)
and the Pool Balance (Class AP 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 199  -  Certificates equal  to  the
product  of (i) the ratio obtained by  dividing the Class M Principal Balance by
the sum of the Class A Principal Balance, the Class M Principal Balance and  the
Class  B  Principal Balance  and  (ii) the  Classes  A/M/B Voting  Interest. The
aggregate Voting Interests of each Subclass of Class A Certificates on any  date
will be equal to the product of (a) the Class A Voting Interest on such date and
(b)  the fraction obtained by dividing the Class A Subclass Principal Balance of
such Subclass on such date by  the aggregate Class A Subclass Principal  Balance
of  the Class A Certificates 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
Subclass  will have a  Voting Interest in  such Subclass equal  to such holder's
Percentage Interest in such Subclass. Unless Definitive Certificates are  issued
as  described above, Beneficial  Owners of Book-Entry  Certificates may exercise
their voting rights only through DTC Participants.
 
TRUSTEE
 
    The Trustee for the Series 199 - Certificates will  be                  ,  a
[national  banking association].  The Corporate Trust  Office of  the Trustee is
located at                               . The Trustee  will be responsible  for
monitoring  the compliance of the Master Servicer with the Pooling and Servicing
Agreement and the Underlying Servicing Agreements and make Periodic Advances  to
the  limited extent described herein with respect to the Mortgage Loans serviced
by Norwest Mortgage if
 
                                      S-75
<PAGE>
Norwest Mortgage, as Servicer, fails to make a Periodic Advance required by  the
Underlying  Servicing Agreement. See "The Pooling and Servicing Agreement -- The
Trustee" in the  Prospectus. The  Trustee will be  entitled to  a "Trustee  Fee"
payable  monthly equal to  the product of  (i) 1/12th of  a fixed percentage per
annum as set  forth in  the Pooling and  Servicing Agreement  (the "Trustee  Fee
Rate") and (ii) the aggregate Scheduled Principal Balances of the Mortgage Loans
as of the first day of each month.
 
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,  service
Mortgage Loans in the event a Servicer is terminated and a successor servicer is
not  appointed, provide  certain reports to  the Trustee  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  a
fixed  percentage per annum as set forth  in the Pooling and Servicing Agreement
(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.
 
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  199  -
Certificates, on any Distribution Date when the Pool Scheduled Principal Balance
is  less than     %  of the Cut-Off  Date Aggregate Principal  Balance. Any such
purchase will be made only in  connection with a "qualified liquidation" of  the
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 REMIC will be distributed to the holder of  the
Class A-R Certificate. See "Description of the Certificates -- Additional Rights
of  the  Class  A-R Certificateholder"  herein  and "The  Pooling  and Servicing
Agreement -- Termination; Purchase of Mortgage Loans" in the Prospectus.
 
                                      S-76
<PAGE>
                        SERVICING OF THE MORTGAGE LOANS
 
    Norwest Mortgage will service approximately     % (by Cut-Off Date Aggregate
Principal  Balance) of  the Mortgage Loans  and the 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  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.
 
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................................................                       %
                                                                                            %
                                                                                            %
                                                                                            %
                                                                                            %
                                                                                            %
                                                                                            %
                                                                                            %
                                                                                            %
                                                                                     -------
    Total............................................................                 100.00%
                                                                                     -------
                                                                                     -------
</TABLE>
 
    Certain information with respect to the loan servicing experience of Norwest
Mortgage  is set  forth under "Norwest  Mortgage --  Delinquency and Foreclosure
Experience."
 
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;
 
                                      S-77
<PAGE>
        (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 Prepayment  Interest Shortfalls 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;
 
        (e) all proceeds of any Mortgage Loans, or property acquired in  respect
    thereof,  liquidated, foreclosed,  purchased or repurchased  pursuant to the
    Pooling and Servicing  Agreement (other than  Partial Liquidation  Proceeds)
    received by such Servicer on or after the Due Date occurring in the month in
    which  such  Distribution Date  occurs, all  principal prepayments  in full,
    partial principal prepayments and  Partial Liquidation Proceeds on  Mortgage
    Loans  received on or after the Determination Date occurring in the month in
    which such Distribution Date occurs, 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
 
        (h)  reinvestment  earnings  on  payments  received  in  respect  of the
    Mortgage Loans  or on  other  amounts on  deposit  in the  related  Servicer
    Custodial Account.
 
FIXED RETAINED YIELD; SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    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 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, as of the
Cut-Off Date, is expected to range from approximately     % to     % 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 Servicing  Fees payable to
such Servicer with respect  to the Mortgage Loans  serviced by Norwest  Mortgage
are  subject to reduction  in any month to  cover Prepayment Interest Shortfalls
with respect to such Mortgage Loans.
 
    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)     %, (b) the Servicing Fee Rate, (c) the Master Servicing Fee  Rate
and  (d) the Trustee 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 information  regarding other possible compensation to  the
Servicer.  The servicing fees and other expenses  of the REMIC will be allocated
to a holder of the Class A-R  Certificate who is an individual, estate or  trust
(whether  such  Certificate is  held  directly or  through  certain pass-through
entities) as additional  gross income  without a  corresponding 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. See  "Certain Federal Income Tax  Consequences
- --  Federal Income  Tax Consequences  for REMIC  Certificates --  Limitations on
Deduction of Certain Expenses" in the Prospectus.
 
                                      S-78
<PAGE>
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.
 
    An  election will be  made to treat  the Trust Estate,  and the Trust Estate
will qualify, as a REMIC for federal  income tax purposes. The Class A-1,  Class
A-2,  Class A-3, Class A-4 and Class A-5 Certificates, the Class AP Certificates
and  the  Class  M  Certificates  (collectively,  the  "Regular  Certificates"),
together  with the  Class B-1,  Class B-2,  Class B-3,  Class B-4  and Class B-5
Certificates, will be designated as the regular interests in the REMIC, and  the
Class  A-R Certificate will be designated as the residual interest in the REMIC.
The Class  A-R Certificate  is  a "Residual  Certificate"  for purposes  of  the
Prospectus.
 
    The Offered Certificates will be treated as "qualifying real property loans"
for  mutual savings banks and domestic  building and loan associations, "regular
or residual interests in a REMIC"  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 AP Certificates will be issued with original issue discount in  an
amount  equal to the excess of the  initial principal balance thereof over their
respective issue  prices. It  is anticipated  that  the Class  A- and  Class  A-
Certificates  and the  Class M Certificates  will be issued  with original issue
discount in an amount equal to the  excess of the initial principal balances  of
such  Subclasses or Class over their  respective issue prices (including accrued
interest). It is further anticipated that the Class A- and Class A- Certificates
will be issued at a  premium and that the Class  A- Certificates will be  issued
with  DE MINIMIS original  issue discount for federal  income tax purposes. Each
Subclass of the Class B Certificates, which are not offered hereby, also will be
treated as issued with original issue discount for federal income tax purposes.
 
    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 will be calculated using     % SPA. No representation is made as to the
actual rate at which the Mortgage Loans will prepay.
 
RESIDUAL CERTIFICATE
 
    The holder of the Class A-R  Certificate must include the taxable income  or
loss  of the  REMIC in  determining its  federal taxable  income. The  Class A-R
Certificate will remain outstanding for federal
 
                                      S-79
<PAGE>
income tax  purposes  until  there  are  no  Certificates  of  any  other  Class
outstanding.   PROSPECTIVE   INVESTORS  ARE   CAUTIONED   THAT  THE   CLASS  A-R
CERTIFICATEHOLDER'S REMIC  TAXABLE  INCOME AND  THE  TAX LIABILITY  THEREON  MAY
EXCEED,  AND MAY SUBSTANTIALLY EXCEED, CASH  DISTRIBUTIONS TO SUCH HOLDER 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 REMIC
includible by the holder of the Class A-R Certificate will be treated as "excess
inclusion" income, resulting  in (i)  the inability of  such holder  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.
 
    Under  the REMIC Regulations, because the fair market value of the Class A-R
Certificate will not exceed 2% of the  fair market value of the REMIC the  Class
A-R  Certificate will not have "significant value," and thrift institutions will
not be  permitted to  offset  their net  operating  losses against  such  excess
inclusion  income. In addition,  the Class A-R Certificate  will be considered a
"noneconomic residual interest," 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 Certificate 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  Certificate in excess  of
cash flows generated thereby, (iii) intends to pay taxes associated with holding
the  Class A-R Certificate as  such taxes become due  and (iv) will not transfer
the Class  A-R Certificate  to any  person or  entity that  does not  provide  a
similar  affidavit. The transferor must certify  in writing to the Trustee 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 Certificate 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
and Class M 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 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  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  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 Certificate should consult
its tax advisors.
 
    DUE  TO  THE  SPECIAL TAX  TREATMENT  OF RESIDUAL  INTERESTS,  THE EFFECTIVE
AFTER-TAX RETURN OF THE  CLASS A-R CERTIFICATE MAY  BE SIGNIFICANTLY LOWER  THAN
WOULD  BE THE CASE IF THE CLASS A-R CERTIFICATE WERE TAXED AS A DEBT INSTRUMENT,
OR MAY BE NEGATIVE.
 
    See "Certain Federal Income Tax Consequences" in the Prospectus.
 
                                      S-80
<PAGE>
                              ERISA CONSIDERATIONS
 
    The Class A-R  Certificate may  not 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 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 Certificate  and for purposes of  the following discussion all
references to  the Offered  Certificates are  deemed to  exclude the  Class  A-R
Certificate.
 
    In  addition, under  current law  the purchase  and holding  of the  Class M
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 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 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, exceed 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 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, the Master Servicer or the  Trustee
to  any obligation in addition to those  undertaken in the Pooling and Servicing
Agreement. The  Class  M 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 Certificates and for purposes
of  the  following discussion  all references  to  the Offered  Certificates are
deemed to exclude the Class M 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 Plan.  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                   ,  the DOL  issued  to the  Underwriter  an individual
administrative exemption, Prohibited Transaction Exemption            ,     Fed.
Reg.         (the "Exemption"), from
 
                                      S-81
<PAGE>
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,  other than  the Class  A-R Certificate,  by an ERISA
Plan, provided that specified conditions are met.
 
    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  Offered  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  Offered 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 Offered 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.] [The Offered
Certificates  will  not  constitute  "mortgage  related  securities"  under  the
Secondary  Mortgage Market Enhancement Act of  1984 (the "Enhancement Act"). The
appropriate characterization  of the  Offered Certificates  under various  legal
investment  restrictions, and  thus the  ability of  investors subject  to these
restrictions to purchase  Offered Certificates,  may be  subject to  significant
interpretive  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 Offered  Certificates will  constitute legal
investments for them.] Investors should consult with their own legal advisors in
determining whether and  to what  extent Offered  Certificates constitute  legal
investments for such investors. 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
 
                                      S-82
<PAGE>
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 may obtain copies of  the
reports  included in  monthly statements  to Certificateholders  described under
"Description of Certificates -- Reports" upon written request to the Trustee  at
the Corporate Trust Office.
 
                                  UNDERWRITING
 
    Subject  to the terms and conditions  of the underwriting agreement dated as
of            , 199  (the "Underwriting Agreement") among Norwest Mortgage,  the
Seller  and  [Underwriter],  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       %  of the  initial
aggregate  principal balance of the  Class A, Class AP  and Class M Certificates
plus accrued interest  thereon, other  than on an  amount equal  to the  initial
aggregate  principal balance of the Class AP Certificates, from           1, 199
to (but not including)             , 199 , 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  Class A, Class AP and  Class M Certificates has not
been allocated among the Class  A, Class AP and  Class M Certificates nor  among
the  Subclasses of  Class A Certificates.  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
Underwriter by           ,           .
 
[FOR SERIES WITH A FINANCIAL GUARANTY INSURANCE POLICY:
 
                                    EXPERTS
 
    The consolidated balance  sheets of  Financial Security  Assurance Inc.  and
Subsidiaries  as of  December 31,  1995 and December  31, 1994,  and the related
consolidated statements of  income, changes  in shareholder's  equity, and  cash
flows  for  each of  the  three years  in the  period  ended December  31, 1995,
incorporated by reference in this  Prospectus Supplement have been  incorporated
herein,  in  reliance on  the report  of Coopers  & Lybrand  L.L.P., independent
accountants, given on  the authority  of that firm  as experts  in auditing  and
accounting.]
 
                                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 199 - ] Certificates.
 
                                      S-83
<PAGE>
                                    RATINGS
 
    It  is a condition to the issuance of  the Class A and Class AP Certificates
that they  will have  been  rated [["Aaa"  by  Moody's Investors  Service,  Inc.
("Moody's")]  ["AAA" by [Fitch Investors Service, L.P. ("Fitch")] [Duff & Phelps
Credit Rating  Co. ("DCR")]]  [and] ["AAA"  and "AAAr"  by Standard  and  Poor's
("S&P")]]  and [["Aa"  by Moody's]  ["AA" by  [Fitch] [DCR]  [S&P]] [and]["A" by
[Moody's] [Fitch] [DCR] [S&P]] [and] [["Baa" by Moody's] ["BBB" by [Fitch] [DCR]
[S&P]. 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 Moody's  on mortgage pass-through  certificates address the
likelihood of the receipt  by certificateholders of  all distributions to  which
such  certificateholders  are  entitled.  Moody's  rating  opinions  address the
structural, legal and issuer aspects associated with the certificates, including
the nature of the underlying mortgage loans and the credit quality of the credit
support provider, if any.  Moody's ratings on  pass-through certificates do  not
represent any assessment of the likelihood that principal prepayments may differ
from those originally anticipated.]
 
    [The  ratings assigned by DCR  to mortgage pass-through certificates address
the likelihood  of the  receipt by  certificateholders of  all distributions  to
which  they are entitled under the  transaction structure. DCR's ratings reflect
its analysis of  the riskiness of  the mortgage  loans and its  analysis of  the
structure  of the  transaction as  set forth  in the  operative documents. DCR's
ratings do not  address the effect  on the certificates'  yield attributable  to
prepayments  or recoveries  on the underlying  mortgage loans.  In addition, the
rating of the Class A-R Certificate does not assess the likelihood of return  to
the  investor in the Class A-R Certificate, except  to the extent of the Class A
Subclass Principal Balance thereof and interest thereon.]
 
    [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 [Moody's]  [DCR] [S&P] and
[Fitch], 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 [Moody's]  [DCR] [S&P]  and
[Fitch].
 
                                      S-84
<PAGE>
                              INDEX OF SIGNIFICANT
                       PROSPECTUS SUPPLEMENT DEFINITIONS
 
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Adjusted Pool Amount.....................................................................................  S-32
Adjusted Pool Amount (Class AP Portion)..................................................................  S-33
Adjustment Amount........................................................................................  S-54
Aggregate Current Bankruptcy Losses......................................................................  S-55
Aggregate Current Fraud Losses...........................................................................  S-54
Aggregate Current Special Hazard Losses..................................................................  S-54
Bankruptcy Loss..........................................................................................  S-37
Bankruptcy Loss Amount...................................................................................  S-55
Beneficial Owner.........................................................................................  S-28
Book-Entry Certificates..................................................................................  S-3
Bulk Purchase Underwritten Loans.........................................................................  S-13
CBE......................................................................................................  S-74
Cede.....................................................................................................  S-28
Certificateholder........................................................................................  S-3
Certificates.............................................................................................  S-7
CGC......................................................................................................  S-49
CGIC.....................................................................................................  S-49
Class A Certificates.....................................................................................  Cover
Class A Distribution Amount..............................................................................  S-31
Class A Optimal Amount...................................................................................  S-34
Class A Optimal Principal Amount.........................................................................  S-35
Class A Percentage.......................................................................................  S-37
Class A Prepayment Percentage............................................................................  S-37
Class A Principal Balance................................................................................  S-32
Class A Principal Distribution Amount....................................................................  S-35
Class A Subclass Interest Accrual Amount.................................................................  S-31
Class A Subclass Interest Shortfall Amount...............................................................  S-34
Class A Subclass Principal Balance.......................................................................  S-31
Class A Voting Interest..................................................................................  S-75
Class AP Certificates....................................................................................  Cover
Class AP Deferred Amount.................................................................................  S-39
Class AP Fraction........................................................................................  S-39
Class AP Optimal Principal Amount........................................................................  S-38
Class AP Principal Balance...............................................................................  S-32
Class AP Principal Distribution Amount...................................................................  S-38
Class B Certificates.....................................................................................  Cover
Class B Principal Balance................................................................................  S-32
Class B Subclass Interest Accrual Amount.................................................................  S-31
Class B Subclass Principal Balance.......................................................................  S-32
Class M Certificates.....................................................................................  Cover
Class M Distribution Amount..............................................................................  S-31
Class M Interest Accrual Amount..........................................................................  S-31
Class M Interest Shortfall Amount........................................................................  S-34
Class M Optimal Amount...................................................................................  S-35
Class M Optimal Principal Amount.........................................................................  S-39
Class M Percentage.......................................................................................  S-40
Class M Prepayment Percentage............................................................................  S-40
Class M Principal Balance................................................................................  S-32
Class M Principal Distribution Amount....................................................................  S-39
</TABLE>
 
                                      S-85
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Classes A/M/B Fraction...................................................................................  S-36
Classes A/M/B Voting Interest............................................................................  S-75
Closing Date.............................................................................................  S-12
Co-op Shares.............................................................................................  S-56
Code.....................................................................................................  S-25
Companion Certificates...................................................................................  Cover
Cooperatives.............................................................................................  S-56
Correspondent............................................................................................  S-2
Cross-Over Date..........................................................................................  S-52
Current Class B-1 Fractional Interest....................................................................  S-41
Current Class B-2 Fractional Interest....................................................................  S-42
Current Class B-3 Fractional Interest....................................................................  S-42
Current Class B-4 Fractional Interest....................................................................  S-42
Current Class M Fractional Interest......................................................................  S-41
Cut-Off Date Aggregate Principal Balance.................................................................  S-56
DCR......................................................................................................  S-8
Debt Service Reduction...................................................................................  S-37
Deficient Valuation......................................................................................  S-37
Definitive Certificates..................................................................................  S-10
Determination Date.......................................................................................  S-29
Discount Mortgage Loans..................................................................................  S-3
Distribution Date........................................................................................  S-2
DOL......................................................................................................  S-81
DTC......................................................................................................  S-10
Enhancement Act..........................................................................................  S-26
ERISA....................................................................................................  S-25
ERISA Plan...............................................................................................  S-81
Excess Bankruptcy Losses.................................................................................  S-55
Excess Fraud Losses......................................................................................  S-54
Excess Principal Payment.................................................................................  S-44
Excess Special Hazard Loss...............................................................................  S-54
Exchange Act.............................................................................................  S-50
Exemption................................................................................................  S-81
Financial Security.......................................................................................  S-48
Fitch....................................................................................................  S-8
Fixed Non-relocation Program Loans.......................................................................  S-63
Fixed Program Loans......................................................................................  S-63
Fixed Retained Yield.....................................................................................  S-78
Fraud Loss...............................................................................................  S-37
Fraud Loss Amount........................................................................................  S-54
Fund American............................................................................................  S-48
GEMICO...................................................................................................  S-13
Holdings.................................................................................................  S-48
Liquidated Loan..........................................................................................  S-36
Liquidated Loan Loss.....................................................................................  S-36
Master Servicer..........................................................................................  S-2
Master Servicing Fee.....................................................................................  S-76
Master Servicing Fee Rate................................................................................  S-76
Moody's..................................................................................................  S-8
Mortgage Loans...........................................................................................  S-2
Mortgaged Properties.....................................................................................  S-56
</TABLE>
 
                                      S-86
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Mortgages................................................................................................  S-56
NASCOR...................................................................................................  S-2
Net Foreclosure Profits..................................................................................  S-47
Net Mortgage Interest Rate...............................................................................  S-33
Net Partial Liquidation Proceeds.........................................................................  S-36
Non-Supported Interest Shortfalls........................................................................  S-16
Norwest Bank.............................................................................................  S-2
Norwest Mortgage.........................................................................................  S-2
Norwest Mortgage Underwritten Loans......................................................................  S-13
Offered Certificates.....................................................................................  Cover
Original Class B-1 Fractional Interest...................................................................  S-41
Original Class B-2 Fractional Interest...................................................................  S-42
Original Class B-3 Fractional Interest...................................................................  S-42
Original Class B-4 Fractional Interest...................................................................  S-42
Original Class M Fractional Interest.....................................................................  S-41
Original Subordinated Principal Balance..................................................................  S-37
Other Servicers..........................................................................................  S-77
PAC Certificates.........................................................................................  Cover
PAC Principal Amount.....................................................................................  S-42
Partial Liquidation Proceeds.............................................................................  S-36
Pass-Through Rate........................................................................................  S-15
Percentage Interest......................................................................................  S-31
Periodic Advance.........................................................................................  S-48
Plan.....................................................................................................  S-25
Pool Balance (Class AP Portion)..........................................................................  S-19
Pool Balance (Classes A/M/B Portion).....................................................................  S-19
Pool Certification Underwritten Loans....................................................................  S-13
Pool Distribution Amount.................................................................................  S-29
Pool Distribution Amount Allocation......................................................................  S-30
Pooling and Servicing Agreement..........................................................................  S-74
Prepayment Interest Shortfalls...........................................................................  S-33
Program Loans............................................................................................  S-63
Prospectus...............................................................................................  S-7
PTE 83-1.................................................................................................  S-81
PTE 95-60................................................................................................  S-81
Realized Losses..........................................................................................  S-37
Record Date..............................................................................................  S-29
Regular Certificates.....................................................................................  S-79
Relocation Mortgage Loans................................................................................  S-63
REMIC....................................................................................................  S-4
Remittance Date..........................................................................................  S-30
REO Property.............................................................................................  S-76
Residual Certificate.....................................................................................  S-79
S&P......................................................................................................  S-8
Scheduled Principal Balance..............................................................................  S-36
Securities Act...........................................................................................  S-82
Seller...................................................................................................  S-2
Senior Certificates......................................................................................  Cover
Senior Optimal Amount....................................................................................  S-34
Series 199 - Certificates................................................................................  Cover
Servicer.................................................................................................  S-2
</TABLE>
 
                                      S-87
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Servicer Custodial Account...............................................................................  S-77
Servicers................................................................................................  S-77
Servicing Fee Rate.......................................................................................  S-78
Similar Law..............................................................................................  S-25
SPA......................................................................................................  S-71
Special Hazard Loss......................................................................................  S-36
Special Hazard Loss Amount...............................................................................  S-54
Subclass.................................................................................................  Cover
Subordinated Certificates................................................................................  Cover
Subordinated Percentage..................................................................................  S-38
Subordinated Prepayment Percentage.......................................................................  S-38
Subsidy Account..........................................................................................  S-57
Subsidy Loan.............................................................................................  S-57
TAC Certificates.........................................................................................  Cover
TAC Principal Amount.....................................................................................  S-42
Tokio Marine.............................................................................................  S-48
Trust Estate.............................................................................................  S-2
Trustee..................................................................................................  S-8
Trustee Fee..............................................................................................  S-76
Trustee Fee Rate.........................................................................................  S-76
U.S. Person..............................................................................................  S-50
UGRIC....................................................................................................  S-13
Underlying Servicing Agreement...........................................................................  S-7
Underwriter..............................................................................................  Cover
Underwriting Agreement...................................................................................  S-83
US WEST..................................................................................................  S-48
</TABLE>
 
                                      S-88
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
   
             PROSPECTUS, SUBJECT TO COMPLETION, DATED MAY 28, 1996
    
 
                                     [LOGO]
                                     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           , 199
<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. 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
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.
 
                                       2
<PAGE>
               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...............................................................................         22
  Norwest Mortgage Underwriting............................................................................         22
</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......................................................................         34
    General................................................................................................         34
    Distributions of Interest..............................................................................         35
    Distributions of Principal.............................................................................         36
  Other Credit Enhancement.................................................................................         37
    Limited Guarantee......................................................................................         37
    Financial Guaranty Insurance Policy or Surety Bond.....................................................         38
    Letter of Credit.......................................................................................         38
    Pool Insurance Policies................................................................................         38
    Special Hazard Insurance Policies......................................................................         38
    Mortgagor Bankruptcy Bond..............................................................................         38
    Reserve Fund...........................................................................................         38
    Cross Support..........................................................................................         39
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......................................................................................         42
  The Servicers............................................................................................         43
  Payments on Mortgage Loans...............................................................................         43
  Periodic Advances and Limitations Thereon................................................................         46
  Adjustment to Servicing Fee in Connection with Prepaid Mortgage Loans....................................         47
  Collection and Other Servicing Procedures................................................................         47
  Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage Loans............................         48
  Insurance Policies.......................................................................................         50
  Fixed Retained Yield, Servicing Compensation and Payment of Expenses.....................................         51
  Evidence as to Compliance................................................................................         52
Certain Matters Regarding the Master Servicer..............................................................         52
The Pooling and Servicing Agreement........................................................................         53
  Assignment of Mortgage Loans to the Trustee..............................................................         53
  Optional Purchases.......................................................................................         55
  Reports to Certificateholders............................................................................         55
  List of Certificateholders...............................................................................         56
  Events of Default........................................................................................         56
  Rights Upon Event of Default.............................................................................         57
  Amendment................................................................................................         57
  Termination; Optional Purchase of Mortgage Loans.........................................................         58
  The Trustee..............................................................................................         59
Certain Legal Aspects of the Mortgage Loans................................................................         59
  General..................................................................................................         59
  Foreclosure..............................................................................................         60
  Foreclosure on Shares of Cooperatives....................................................................         61
  Rights of Redemption.....................................................................................         61
</TABLE>
 
                                       5
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
  Anti-Deficiency Legislation and Other Limitations on Lenders.............................................         62
  Soldiers' and Sailors' Civil Relief Act and Similar Laws.................................................         63
  Environmental Considerations.............................................................................         63
  "Due-on-Sale" Clauses....................................................................................         65
  Applicability of Usury Laws..............................................................................         66
  Enforceability of Certain Provisions.....................................................................         66
Certain Federal Income Tax Consequences....................................................................         66
  Federal Income Tax Consequences for REMIC Certificates...................................................         67
  General..................................................................................................         67
  Status of REMIC Certificates.............................................................................         67
  Qualification as a REMIC.................................................................................         68
  Taxation of Regular Certificates.........................................................................         69
    General................................................................................................         69
    Original Issue Discount................................................................................         70
    Acquisition Premium....................................................................................         72
    Variable Rate Regular Certificates.....................................................................         72
    Market Discount........................................................................................         74
    Premium................................................................................................         74
    Election to Treat All Interest Under the Constant Yield Method.........................................         75
    Treatment of Losses....................................................................................         75
    Sale or Exchange of Regular Certificates...............................................................         76
  Taxation of Residual Certificates........................................................................         76
    Taxation of REMIC Income...............................................................................         76
    Basis and Losses.......................................................................................         78
    Treatment of Certain Items of REMIC Income and Expense.................................................         78
    Original Issue Discount and Premium....................................................................         78
    Market Discount........................................................................................         79
    Premium................................................................................................         79
    Limitations on Offset or Exemption of REMIC Income.....................................................         79
    Tax-Related Restrictions on Transfer of Residual Certificates..........................................         80
    Disqualified Organizations.............................................................................         80
    Noneconomic Residual Interests.........................................................................         81
    Foreign Investors......................................................................................         82
    Sale or Exchange of a Residual Certificate.............................................................         82
    Mark to Market Regulations.............................................................................         83
  Taxes That May Be Imposed on the REMIC Pool..............................................................         83
    Prohibited Transactions................................................................................         83
    Contributions to the REMIC Pool After the Startup Day..................................................         83
    Net Income from Foreclosure Property...................................................................         84
  Liquidation of the REMIC Pool............................................................................         84
  Administrative Matters...................................................................................         84
  Limitations on Deduction of Certain Expenses.............................................................         84
  Taxation of Certain Foreign Investors....................................................................         85
    Regular Certificates...................................................................................         85
    Residual Certificates..................................................................................         85
  Backup Withholding.......................................................................................         86
  Reporting Requirements...................................................................................         86
</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...................................................................................         88
    Premium................................................................................................         88
    Original Issue Discount................................................................................         88
    Market Discount........................................................................................         88
    Recharacterization of Servicing Fees...................................................................         88
    Sale or Exchange of Certificates.......................................................................         89
  Stripped Certificates....................................................................................         90
    General................................................................................................         90
    Status of Stripped Certificates........................................................................         91
    Taxation of Stripped Certificates......................................................................         91
    Original Issue Discount................................................................................         91
    Sale or Exchange of Stripped Certificates..............................................................         92
    Purchase of More Than One Class of Stripped Certificates...............................................         92
    Possible Alternative Characterizations.................................................................         92
  Reporting Requirements and Backup Withholding............................................................         93
  Taxation of Certain Foreign Investors....................................................................         93
ERISA Considerations.......................................................................................         93
  General..................................................................................................         93
  Certain Requirements Under ERISA.........................................................................         94
    General................................................................................................         94
    Parties in Interest/Disqualified Persons...............................................................         94
    Delegation of Fiduciary Duty...........................................................................         94
  Administrative Exemptions................................................................................         95
    Individual Administrative Exemptions...................................................................         95
    PTE 83-1...............................................................................................         96
  Exempt Plans.............................................................................................         97
  Unrelated Business Taxable Income -- Residual Certificates...............................................         97
Legal Investment...........................................................................................         97
Plan of Distribution.......................................................................................         99
Use of Proceeds............................................................................................        100
Legal Matters..............................................................................................        100
Rating.....................................................................................................        100
Index of Significant Definitions...........................................................................        101
</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.  Prior to  the  PHMC Acquisition,
Norwest Mortgage serviced residential mortgage loans for its own account or  the
account  of others with  an aggregate unpaid  principal balance as  of March 31,
1996 of $         . Following the PHMC Acquisition, Norwest Mortgage became  the
servicer  of  residential  mortgage  loans with  an  aggregate  unpaid principal
balance as of  March 31,  1996 of $            and the subservicer  for PHMC  of
mortgage  loans with an aggregate unpaid principal  balance as of March 31, 1996
of $        .
 
                                  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.
 
                                       20
<PAGE>
    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 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.
 
                                       21
<PAGE>
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 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
 
                                       22
<PAGE>
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
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, in lieu of  a verification of employment, employment  information
may  be obtained  through V.I.E., Inc.,  an affiliate of  Norwest Mortgage, that
obtains employment  data  from  state  unemployment  insurance  departments.  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, all borrowers applying for loans generally 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 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
 
                                       23
<PAGE>
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 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
 
                                       24
<PAGE>
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 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%.  Only   primary  residences  (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
 
                                       25
<PAGE>
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  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.
 
                                       26
<PAGE>
    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.
 
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
 
                                       27
<PAGE>
    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;
 
          (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 13 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
 
                                       28
<PAGE>
    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;
 
          (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;
 
                                       29
<PAGE>
       (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 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
 
                                       30
<PAGE>
(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.
 
    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.
 
                                       31
<PAGE>
    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,  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
 
                                       32
<PAGE>
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 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.
 
                                       33
<PAGE>
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 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, as adjusted in respect of principal prepayments in
    full as  described in  "Servicing of  the Mortgage  Loans --  Adjustment  to
    Servicing  Fee in Connection  with Prepaid Mortgage  Loans" below, (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;
 
                                       34
<PAGE>
           (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;
 
           (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
 
                                       35
<PAGE>
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  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
 
                                       36
<PAGE>
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  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.
 
                                       37
<PAGE>
    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.
 
    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.
 
                                       38
<PAGE>
    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.
 
                      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
 
                                       39
<PAGE>
after the  Determination Date  in the  month preceding  the month  in which  the
related Distribution Date occurs and prior to the Due Date in the month in which
such  Distribution Date occurs, or, with respect to certain Underlying Servicing
Agreements,  during  the  month  preceding  the  month  in  which  the   related
Distribution  Date  occurs,  the related  Servicer  will pay  into  the Servicer
Custodial Account for remittance to the Certificate Account for such Series,  to
the  extent funds  are available for  such purpose from  the aggregate Servicing
Fees (or portion thereof as  specified in the applicable Prospectus  Supplement)
which  such Servicer  is entitled to  receive relating to  mortgagor payments or
other recoveries distributed to  Certificateholders on the related  Distribution
Date, the amount, if any, of interest at the Net Mortgage Interest Rate for such
Mortgage  Loan for the  period from the date  of such prepayment  in full to and
including the end  of the  month in  which such  prepayment in  full occurs.  No
comparable  offset against  the Servicing Fee  will be provided  with respect to
liquidations  of  any  Mortgage  Loans.  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. See "Servicing of the Mortgage Loans -- Adjustment
to Servicing Fee in Connection with Prepaid Mortgage Loans."
 
    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
 
                                       40
<PAGE>
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
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
 
                                       41
<PAGE>
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 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  loan 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.
 
                                       42
<PAGE>
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 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
 
                                       43
<PAGE>
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 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 18th
calendar day  of each  month  or such  other  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
 
                                       44
<PAGE>
         (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.
 
    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;
 
                                       45
<PAGE>
          (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);
 
         (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
 
                                       46
<PAGE>
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 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.
 
ADJUSTMENT TO SERVICING FEE IN CONNECTION WITH PREPAID MORTGAGE LOANS
 
    When a mortgagor prepays all or part of a Mortgage Loan, the mortgagor  pays
interest  on  the  amount  prepaid  only to  the  date  on  which  the principal
prepayment is applied to the principal balance thereof. To the extent  specified
in the applicable Prospectus Supplement, in order to mitigate the adverse effect
to  Certificateholders of a  Series resulting from the  prepayment of a Mortgage
Loan or a portion  thereof, the amount  of the aggregate  Servicing Fees may  be
offset by an amount equal to the related interest shortfall. Any such reductions
in the aggregate Servicing Fees will be made by the Servicer with respect to the
Mortgage  Loans under the applicable Underlying Servicing Agreement, but only to
the extent of the  aggregate amount of any  Servicing Fees otherwise payable  to
such  Servicer relating to mortgagor payments or other recoveries distributed on
the related Distribution Date.  The amount of any  offset against the  aggregate
Servicing  Fees will be  included in the  distributions to Certificateholders on
the Distribution  Date on  which the  related principal  prepayments are  passed
through to Certificateholders.
 
    Unless  such  an offset  against Servicing  Fees  with respect  to principal
prepayments or another form of offset is specified in the applicable  Prospectus
Supplement,  any interest shortfall arising from  full or partial prepayments or
liquidations will not be  so offset and will  be borne by Certificateholders  of
the applicable Series. See "Prepayment and Yield Considerations."
 
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
 
                                       47
<PAGE>
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 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
 
                                       48
<PAGE>
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
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
 
                                       49
<PAGE>
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
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
 
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<PAGE>
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  and prior  to deposit  of such  payments in  the Servicer
Custodial Account or Certificate  Account for such Series  or may withdraw  from
the  Servicer Custodial  Account or Certificate  Account, or  request the Master
Servicer to  withdraw from  the Certificate  Account for  remittance to  Norwest
Mortgage as Servicer, the Fixed Retained Yield after the entire payment has been
deposited  in such account.  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 Servicing  Agreement, subject, to  the
extent  specified  in the  applicable  Prospectus Supplement,  to  adjustment as
described above under "-- Adjustment to Servicing Fee in Connection with Prepaid
Mortgage Loans." 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
or  foreclosure 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
 
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<PAGE>
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. 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.
 
    Each  year the Master Servicer will review each Servicer's performance under
its Underlying  Servicing Agreement  and the  status of  any fidelity  bond  and
errors and omissions policy required to be maintained by such Servicer under the
Underlying Servicing Agreement.
 
                 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
 
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<PAGE>
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.
 
    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 is
discovered at any  time not to  be in conformance  with the representations  and
warranties Norwest Mortgage has made to the Seller,
 
                                       53
<PAGE>
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 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
 
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<PAGE>
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.
 
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;
 
                                       55
<PAGE>
           (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 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).
 
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<PAGE>
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).
 
    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
 
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<PAGE>
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 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
 
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<PAGE>
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 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
 
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<PAGE>
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.
 
    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.
 
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<PAGE>
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.
 
    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
 
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<PAGE>
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.
 
    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
 
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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.
 
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
 
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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.
 
    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
 
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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.
 
    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
 
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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 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
 
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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, 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 mutual savings bank or a domestic building and
loan association will  constitute "qualifying  real property  loans" within  the
meaning  of Code Section 593(d)(1) in the same proportion that the assets of the
REMIC Pool would be so treated.  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 Sections 593(d)(1)
and 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
 
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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  "qualifying  real
property  loans"  or  "loans...secured  by an  interest  in  real  property" for
purposes of Code Sections 593(d)(1) and 7701(a)(19)(C)(v), respectively, 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).
 
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
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
 
                                       68
<PAGE>
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  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.
 
                                       69
<PAGE>
    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 (the  "OID Regulations")  and proposed
Treasury  regulations  issued   on  December   16,  1994   (the  "Proposed   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 and  the Proposed  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  and the  Proposed 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  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
 
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<PAGE>
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  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.
 
                                       71
<PAGE>
    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.
 
    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 multiple of not less than zero nor 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 includes  a
rate  determined using a single  fixed formula and that is  based on one or more
qualified floating rates or the yield or changes in the price of actively traded
personal property. The Proposed OID  Regulations would expand the definition  of
objective  rate to include 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
 
                                       72
<PAGE>
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 and the Proposed
OID  Regulations. The Proposed 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  Proposed
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.
 
    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.
 
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<PAGE>
    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 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
 
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<PAGE>
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.
 
    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
 
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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 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
 
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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
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.
 
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<PAGE>
    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.
 
    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."
 
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<PAGE>
    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.
 
    LIMITATIONS ON OFFSET OR EXEMPTION OF REMIC INCOME
 
    Except in the case of certain thrift institutions, 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. 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
 
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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.
 
    An  exception  to  the  inability  of a  Residual  Holder  to  offset excess
inclusions with unrelated deductions  and net operating  losses applies to  Code
Section  593 institutions ("thrift institutions"). For purposes of applying this
rule, all  members of  an  affiliated group  filing  a consolidated  return  are
treated  as one taxpayer, except that  thrift institutions to which Code Section
593 applies,  together  with their  subsidiaries  formed to  issue  REMICs,  are
treated   as  separate   corporations.  Furthermore,  the   Code  provides  that
regulations may disallow the ability of  a thrift institution to use  deductions
to offset excess inclusions if necessary or appropriate to prevent the avoidance
of  tax. A thrift institution may not so offset its excess inclusions unless the
Residual Certificates  have "significant  value," which  requires that  (i)  the
Residual  Certificates have an issue  price that is at least  equal to 2% of the
aggregate  of  the  issue  prices  of  all  Residual  Certificates  and  Regular
Certificates  with respect to the REMIC  Pool, and (ii) the anticipated weighted
average life of  the Residual Certificates  is at least  20% of the  anticipated
weighted  average life of the REMIC  Pool. The anticipated weighted average life
of the Residual  Certificates is based  on all distributions  anticipated to  be
received with respect thereto (using the Prepayment Assumption). The anticipated
weighted  average life of the REMIC Pool  is the aggregate weighted average life
of  all  classes   of  interests   therein  (computed   using  all   anticipated
distributions  on a regular interest with  nominal or no principal). Finally, an
ordering rule under the REMIC Regulations provides that a thrift institution may
only offset  its excess  inclusion income  with deductions  after it  has  first
applied  its deductions against  income that is not  excess inclusion income. If
applicable, the Prospectus Supplement  with respect to a  Series will set  forth
whether  the  Residual Certificates  are  expected to  have  "significant value"
within the meaning of the REMIC Regulations.
 
    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 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
 
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<PAGE>
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 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
 
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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  thereof, or an estate or trust  that
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
 
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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.
 
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.
 
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<PAGE>
    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  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
 
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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 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)
 
                                       85
<PAGE>
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 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
 
                                       86
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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 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 financial  institution described  in Code
           Section 593(a)  will  be  considered to  represent  "qualifying  real
    property  loans" within the meaning of Code Section 593(d)(1), provided that
    the  real  property  securing  the   Mortgage  Loans  represented  by   that
    Certificate is of the type described in such section of the Code.
 
       3.  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).
 
       4.  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
 
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    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,  2  and  3  of the
immediately preceding  paragraph. Code  Section 593(d)(1)(C)  provides that  the
term  "qualifying real  property loan"  does not include  a loan  "to the extent
secured by a  deposit in  or share  of the  taxpayer." The  application of  this
provision  to a Buy-Down  Fund is uncertain,  but may require  that a taxpayer's
investment in  a Buy-Down  Loan  be reduced  by the  Buy-Down  Fund. As  to  the
treatment  of  Buy-Down Loans  as "qualifying  real  property loans"  under Code
Section 593(d)(1) if the exception of Code Section 593(d)(1)(C) is inapplicable,
as "loans...secured  by  an  interest  in  real  property"  under  Code  Section
7701(a)(19)(C)(v)  or as "real  estate assets" under  Code Section 856(c)(5)(A),
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 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
 
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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 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
 
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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 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
 
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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. 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.
 
    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.
 
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    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 and the Proposed OID  Regulations. The Proposed 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 Proposed 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.
 
    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
 
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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 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,
 
                                       93
<PAGE>
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.
 
    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,
 
                                       94
<PAGE>
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 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.
 
                                       95
<PAGE>
    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 "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
 
                                       96
<PAGE>
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.
 
    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,
 
                                       97
<PAGE>
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).
 
    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.
 
                                       98
<PAGE>
                              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.
 
    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
 
                                       99
<PAGE>
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.
 
                                      100
<PAGE>
                        INDEX OF SIGNIFICANT DEFINITIONS
 
<TABLE>
<CAPTION>
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<S>                                                                                                        <C>
Accrual Certificates.....................................................................................         35
Advances.................................................................................................         46
ALTA.....................................................................................................         25
Balloon Loan.............................................................................................         18
Balloon Period...........................................................................................         18
Bankruptcy Code..........................................................................................         62
Bankruptcy Loss..........................................................................................         36
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
DCR......................................................................................................         95
Deferred Interest........................................................................................         17
Definitive Certificates..................................................................................         11
Delegated Underwriting...................................................................................         21
Department...............................................................................................         94
Depository...............................................................................................         43
Detailed Information.....................................................................................          2
Disqualified Organization................................................................................         80
Distribution Date........................................................................................         10
DTC......................................................................................................         12
DTC Participants.........................................................................................         32
Due Date.................................................................................................         16
Due on Sale..............................................................................................         64
Eligible Custodial Account...............................................................................         44
ERISA....................................................................................................         11
Excess Bankruptcy Losses.................................................................................         36
Excess Fraud Losses......................................................................................         36
Excess Special Hazard Losses.............................................................................         36
FDIC.....................................................................................................         43
FHLBB....................................................................................................         64
FHLMC....................................................................................................         25
Fitch....................................................................................................         95
Fixed Retained Yield.....................................................................................         35
FNMA.....................................................................................................         25
Fraud Loss...............................................................................................         36
Garn Act.................................................................................................         64
GEMICO...................................................................................................         25
Indirect DTC Participants................................................................................         32
IRA......................................................................................................         93
</TABLE>
 
                                      101
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
Joint Ventures...........................................................................................         20
<S>                                                                                                        <C>
Liquidation Proceeds.....................................................................................         44
Loan Stores..............................................................................................         20
Master Servicer..........................................................................................      cover
Master Servicing Fee.....................................................................................         35
Moody's..................................................................................................         95
Mortgage Loans...........................................................................................      cover
Mortgage Notes...........................................................................................         15
Mortgaged Properties.....................................................................................         15
Mortgages................................................................................................         15
NASCOR...................................................................................................      cover
Net Foreclosure Profits..................................................................................         34
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..........................................................................................         69
Other Advances...........................................................................................         46
OTS......................................................................................................         64
Pass-Through Rate........................................................................................          9
Pass-Through Entity......................................................................................         81
Paying Agent.............................................................................................         46
Percentage Interest......................................................................................         33
Periodic Advances........................................................................................         10
PHMC.....................................................................................................         19
PHMC Mortgage Loans......................................................................................         19
Plans....................................................................................................         93
Policy Statement.........................................................................................         98
Pool Distribution Amount.................................................................................         33
Pool Insurers............................................................................................         25
Pooling and Servicing Agreement..........................................................................          8
Prepayment Assumption....................................................................................         71
Program Loans............................................................................................         42
Proposed Mark to Market Regulations......................................................................         83
Proposed OID Regulations.................................................................................         69
PTE 83-1.................................................................................................         96
Qualified Mortgage.......................................................................................         30
Rating Agency............................................................................................         12
Record Date..............................................................................................         10
Regular Certificateholder................................................................................         69
Regular Certificates.....................................................................................         31
Regulations..............................................................................................         94
Relief Act...............................................................................................         63
REMIC....................................................................................................      cover
REMIC Certificates.......................................................................................         67
REMIC Pool...............................................................................................         67
REMIC Regulations........................................................................................         66
</TABLE>
 
                                      102
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
Remittance Date..........................................................................................         44
<S>                                                                                                        <C>
Reserve Fund.............................................................................................         38
Residual Certificates....................................................................................         31
Residual Holders.........................................................................................         76
Restricted Group.........................................................................................         96
Rules....................................................................................................         32
S&P......................................................................................................         95
Securities Act...........................................................................................          2
Seller...................................................................................................      cover
Senior Certificates......................................................................................      cover
Series...................................................................................................      cover
Servicer.................................................................................................      cover
Servicer Custodial Account...............................................................................         43
Servicing Account........................................................................................         47
Servicing Fee............................................................................................         35
Special Hazard Loss......................................................................................         37
Standard Hazard Insurance Policy.........................................................................         49
Startup Day..............................................................................................         67
Stripped Certificateholder...............................................................................         91
Stripped Certificates....................................................................................         90
Subclass.................................................................................................      cover
Subordinated Certificates................................................................................      cover
Subsidy Account..........................................................................................         17
Subsidy Loans............................................................................................         17
Subsidy Payments.........................................................................................         17
Superlien................................................................................................         63
Title V..................................................................................................         65
T.O.P. Loans.............................................................................................         25
Treasury Regulations.....................................................................................         54
Trust Estate.............................................................................................      cover
Trustee..................................................................................................         58
Trustee Fee..............................................................................................         35
U.S. Person..............................................................................................         82
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>
 
                                      103
<PAGE>
- ------------------------------------------------
                                ------------------------------------------------
- ------------------------------------------------
                                ------------------------------------------------
 
    NO  DEALER, SALESMAN  OR ANY  OTHER PERSON HAS  BEEN AUTHORIZED  TO GIVE ANY
INFORMATION OR TO MAKE  ANY REPRESENTATIONS OTHER THAN  THOSE CONTAINED IN  THIS
PROSPECTUS  SUPPLEMENT AND  THE ACCOMPANYING  PROSPECTUS IN  CONNECTION WITH THE
OFFER MADE BY THIS PROSPECTUS  SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS,  AND,
IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS 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 THE  SOLICITATION OF  ANY OFFER  TO BUY  ANY SECURITIES  OTHER THAN THE
SECURITIES  DESCRIBED  IN  THIS  PROSPECTUS  SUPPLEMENT  AND  THE   ACCOMPANYING
PROSPECTUS,  NOR DO THEY  CONSTITUTE AN OFFER  TO SELL OR  A SOLICITATION OF ANY
OFFER TO BUY SUCH SECURITIES BY ANYONE  IN ANY JURISDICTION IN WHICH SUCH  OFFER
OR  SOLICITATION IS NOT AUTHORIZED, OR IN  WHICH THE PERSON MAKING SUCH OFFER OR
SOLICITATION IS NOT QUALIFIED TO DO SO, OR TO ANY PERSON TO WHOM IT IS  UNLAWFUL
TO  MAKE SUCH  OFFER OR  SOLICITATION. NEITHER  THE DELIVERY  OF THIS PROSPECTUS
SUPPLEMENT OR THE  ACCOMPANYING PROSPECTUS  NOR ANY SALE  MADE HEREUNDER  SHALL,
UNDER  ANY  CIRCUMSTANCES, CREATE  ANY  IMPLICATION THAT  INFORMATION  HEREIN IS
CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.
                           --------------------------
 
                                     INDEX
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                   PAGE
                                                 ---------
<S>                                              <C>
Table of Contents..............................        S-5
Summary Information............................        S-7
Risk Factors...................................       S-27
Description of the Certificates................       S-28
Description of Mortgage Loans..................       S-57
Norwest Mortgage Delinquency and Foreclosure
 Experience....................................       S-64
Prepayment and Yield Considerations............       S-68
Pooling and Servicing Agreement................       S-75
Servicing of the Mortgage Loans................       S-78
Federal Income Tax Considerations..............       S-80
ERISA Considerations...........................       S-82
Legal Investment...............................       S-83
Secondary Market...............................       S-83
Underwriting...................................       S-84
Legal Matters..................................       S-84
[Experts.......................................       S-84]
Use of Proceeds................................       S-84
Ratings........................................       S-85
Index of Significant Prospectus Supplement
 Definitions...................................       S-86
 
                        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
Mortgage Loan Production Sources...............         20
Description of the Certificates................         30
Prepayment and Yield Considerations............         38
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..................................        100
Rating.........................................        100
Index of Significant Definitions...............        101
</TABLE>
 
                                   $
                                 (APPROXIMATE)
 
                                     [LOGO]
 
                                     SELLER
 
                             MORTGAGE PASS-THROUGH
                           CERTIFICATES, SERIES 199 -
 
                             ---------------------
 
                             PROSPECTUS SUPPLEMENT
                             ---------------------
 
                                 [UNDERWRITER]
 
- ------------------------------------------------
                                ------------------------------------------------
- ------------------------------------------------
                                ------------------------------------------------
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
    The  expenses expected  to be incurred  in connection with  the issuance and
distribution  of  the  securities  being  registered,  other  than  underwriting
compensation,  are  as  set  forth  below.  All  such  expenses  except  for the
registration fees are estimated.
 
<TABLE>
<S>                                                              <C>
SEC Registration Fee...........................................  $1,724,138
Legal Fees and Expenses........................................   1,170,000
Accounting Fees and Expenses...................................     288,000
Trustee's Fees and Expenses
 (including counsel fees)......................................     180,000
Printing and Engraving Fees....................................     448,200
Rating Agency Fees.............................................   2,475,000
Miscellaneous..................................................      85,500
                                                                 ----------
    Total......................................................  $6,370,838
                                                                 ----------
                                                                 ----------
</TABLE>
 
   
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
    
 
    Section 145 of the Delaware General Corporation Law provides that a Delaware
corporation may indemnify any persons, including officers and directors, who are
made, or  are threatened  to be  made,  parties to  any threatened,  pending  or
completed   legal  action,   suit  or   proceeding,  whether   civil,  criminal,
administrative or investigative (other than an action by or in the right of such
corporation), by reason of  the fact that  such person is or  was an officer  or
director  of  such corporation,  or is  or was  serving at  the request  of such
corporation as a director, officer, employee or agent of another corporation  or
enterprise.  The  indemnity may  include  expenses (including  attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred
by such person in connection with such action, suit or proceeding, provided such
officer or director acted in good faith  and in a manner he reasonably  believed
to  be in or not  opposed to the corporation's  best interests and, for criminal
proceedings, had no reasonable cause to believe that his conduct was illegal.  A
Delaware  corporation may indemnify officers and directors in an action by or in
the right  of  the  corporation  under  the  same  conditions,  except  that  no
indemnification  is  permitted  without  judicial  approval  if  the  officer or
director is  adjudged to  be liable  to  the corporation.  Where an  officer  or
director  is successful on the merits or  otherwise in the defense of any action
referred to above, the corporation must indemnify him against the expenses which
such officer or director actually and reasonably incurred.
 
                                      II-1
<PAGE>
    The  By-laws   of  Norwest   Asset   Securities  Corporation   provide   for
indemnification  of officers and  directors to the full  extent permitted by the
Delaware General Corporation Law.
 
    The Pooling and Servicing Agreements for each Series of Certificates provide
either that the Registrant and the partners, directors, officers, employees  and
agents  of  the  Registrant,  or  that the  Master  Servicer  and  the partners,
directors, officers,  employees  and agents  of  the Master  Servicer,  will  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.
 
ITEM 16.  EXHIBITS.
 
   
<TABLE>
<CAPTION>
EXHIBIT NO.                                            DESCRIPTION
- -----------  -----------------------------------------------------------------------------------------------
<C>          <S>
       *1.1  Form of Underwriting Agreement.
       *3.1  Certificate of Incorporation of Norwest Asset Securities Corporation.
       *3.2  By-laws of Norwest Asset Securities Corporation.
       *4.1  Form of Pooling and Servicing Agreement.
       *5.1  Opinion of Cadwalader, Wickersham & Taft with respect to certain matters involving the
              Certificates.
       *8.1  Opinion of Cadwalader, Wickersham & Taft as to tax matters.
      *10.1  Form of Servicing Agreement.
      *23.1  Consent of Cadwalader, Wickersham & Taft (included as part of Exhibits 5.1 and 8.1).
      *23.2  Consent of Coopers & Lybrand regarding Financial Security Assurance Inc.
      *24.1  Power of Attorney.
      *24.2  Power of Attorney.
       24.3  Power of Attorney (included on page II-5 of this Registration Statement).
</TABLE>
    
 
- ------------------------
*Previously filed.
 
ITEM 17.  UNDERTAKINGS.
 
    (a) Undertaking pursuant to Rule 415.
 
    The undersigned Registrant hereby undertakes:
 
        (1)  to file, during any period in which offers or sales are being made,
    a post-effective amendment to this Registration Statement:
 
                                      II-2
<PAGE>
           (i) to include  any prospectus  required by Section  10(a)(3) of  the
       Securities Act of 1933;
 
           (ii)  to reflect in the Prospectus  any facts or events arising after
       the effective  date of  the Registration  Statement (or  the most  recent
       post-effective   amendment  thereof)   which,  individually   or  in  the
       aggregate, represent a fundamental change in the information set forth in
       the Registration Statement;
 
          (iii) to include any material information with respect to the plan  of
       distribution  not previously  disclosed in the  Registration Statement or
       any material change to such information in the Registration Statement.
 
        (2) that,  for  the  purpose  of determining  any  liability  under  the
    Securities  Act of 1933, each such  post-effective amendment shall be deemed
    to be  a  new registration  statement  relating to  the  securities  offered
    therein, and the offering of such securities at that time shall be deemed to
    be the initial bona fide offering thereof; and
 
        (3)  to remove from registration by  means of a post-effective amendment
    any  of  the  securities  being  registered  which  remain  unsold  at   the
    termination of the offering.
 
    (b) Undertaking in respect of indemnification.
 
    Insofar  as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to  directors, officers and controlling persons of  the
Registrant  pursuant to the  foregoing provisions, or  otherwise, the Registrant
has been advised that in the  opinion of the Securities and Exchange  Commission
such indemnification is against public policy as expressed in the Securities Act
of  1933  and  is, therefore,  unenforceable.  In  the event  that  a  claim for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
Registrant  of expenses incurred  or paid by a  director, officer or controlling
person of  the Registrant  in the  successful  defense of  any action,  suit  or
proceeding) is asserted by such officer or controlling person in connection with
the  securities being registered, the Registrant  will, unless in the opinion of
its counsel the matter  has been settled by  controlling precedent, submit to  a
court  of appropriate jurisdiction the  question whether such indemnification by
it is against public policy as expressed in the Securities Act of 1933 and  will
be governed by the final adjudication of such issue.
 
                                      II-3
<PAGE>
   
                                   SIGNATURES
    
 
   
    Pursuant  to the requirements of the  Securities Act of 1933, the Registrant
certifies that it has  reasonable grounds to  believe that it  meets all of  the
requirements  for  filing on  Form S-3  and has  duly caused  this Pre-Effective
Amendment No. 2 to Form S-3 Registration Statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Edison, State of  New
Jersey on May 28, 1996.
    
 
   
                                          By:     /s/ LAWRENCE D. RUBENSTEIN
                                             -----------------------------------
                                             Name:  Lawrence D. Rubenstein
                                             Title:  Vice President and General
                                                     Counsel
    
 
                                      II-4
<PAGE>
    KNOW  ALL MEN  BY THESE PRESENTS,  that each person  whose signature appears
below constitutes  and  appoints Stephen  D.  Morrison, Alta  Jones  and  Robert
Gorsche,  and each  of them, his  true and lawful  attorneys-in-fact and agents,
with full power of substitution and  resubstitution, for and in his name,  place
and  stead, in any and  all capacities to sign  any or all amendments (including
post-effective amendments) to this Registration  Statement and any or all  other
documents  in  connection therewith,  and to  file the  same, with  all exhibits
thereto, with  the  Securities  and  Exchange  Commission,  granting  unto  said
attorneys-in-fact and agents full power and authority to do and perform each and
every  act  and  thing requisite  and  necessary to  be  done in  and  about the
premises, as fully  to all intents  and purposes as  might or could  be done  in
person,  hereby  ratifying and  confirming all  that said  attorneys-in-fact and
agents, or their substitute or substitutes, may lawfully do or cause to be  done
by virtue hereof.
 
   
    PURSUANT   TO  THE  REQUIREMENTS  OF  THE   SECURITIES  ACT  OF  1933,  THIS
PRE-EFFECTIVE AMENDMENT NO. 2 TO FORM S-3 REGISTRATION STATEMENT HAS BEEN SIGNED
BELOW BY THE FOLLOWING PERSONS IN THE CAPACITIES AND ON THE DATES INDICATED.
    
 
   
<TABLE>
<CAPTION>
                         NAME                                            TITLE                         DATE
- -------------------------------------------------------  --------------------------------------  ----------------
 
<C>                                                      <S>                                     <C>
                     /s/ STEPHEN D. MORRISON
      -------------------------------------------        President, Secretary and Director         May 28, 1996
                  Stephen D. Morrison
 
                                     *
      -------------------------------------------        Senior Vice President, Chief Financial    May 28, 1996
                      Alta Jones                          Officer and Chief Accounting Officer
 
                                     *
      -------------------------------------------        Director                                  May 28, 1996
                    Robert Gorsche
 
                        /s/ JAMES B. SVINTH
      -------------------------------------------        Senior Vice President and Director        May 28, 1996
                    James B. Svinth
 
*By:        /s/ STEPHEN D. MORRISON
     -------------------------------------------
     Stephen D. Morrison
     ATTORNEY-IN-FACT
</TABLE>
    
 
                                      II-5
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBIT                                             DESCRIPTION
- ---------  -----------------------------------------------------------------------------------------------
<C>        <S>                                                                                              <C>
    *1.1   Form of Underwriting Agreement.
    *3.1   Certificate of Incorporation of Norwest Asset Securities Corporation.
    *3.2   By-laws of Norwest Asset Securities Corporation.
    *4.1   Form of Pooling and Servicing Agreement.
    *5.1   Opinion of Cadwalader, Wickersham & Taft with respect to certain matters involving the
            Certificates.
    *8.1   Opinion of Cadwalader, Wickersham & Taft as to tax matters.
   *10.1   Form of Servicing Agreement.
   *23.1   Consent of Cadwalader, Wickersham & Taft (included as part of Exhibits 5.1 and 8.1).
   *23.2   Consent of Coopers & Lybrand regarding Financial Security Assurance, Inc.
   *24.1   Power of Attorney.
   *24.2   Power of Attorney.
    24.3   Power of Attorney (included on page II-5 of this Registration Statement).
</TABLE>
    
 
- ------------------------
*  Previously filed.


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