SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 10-K/A

[X]      Annual  report  pursuant  to  Section  13 or  15(d)  of the  Securities
         Exchange Act of 1934 for the period from June 30, 1997 (Commencement of
         Operations) to December 31, 1997

[  ]     Transition report pursuant to Section 13 or 15(d) of the
         Securities Exchange Act of 1934 for the transition period from   to


                         Commission File Number 333-25751


      CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP., SERIES 1997-C1
             (Exact name of registrant as specified in its charter)


       Delaware                                               13-3320910
State or Other Jurisdiction                                 (IRS Employer
   of Incorporation )                                      Identification No.)

Eleven Madison Ave.
 New York, New York                                            10010
(Address of Principal                                         (Zip Code)
    Executive Offices)

       Registrant's telephone number, including area code :(212)325-2000


Securities registered pursuant to Section 12(b) of the Act:  None
Securities registered pursuant to Section 12(g) of the Act:  None

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes X No

     Indicate by check mark if disclosure of delinquent  filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

Documents incorporated by reference:  None

                Page 1 of 4                       This report consists of 10
                                                  consecutively numbered pages.

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                             AMENDMENT NUMBER 1 OF 1







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         (2)  Financial Statement Schedules:

              Omitted.

         (3)  Exhibits:

               Annual Statement of Compliance, filed as Exhibit 99.1 hereto.

               Annual Servicing Reports, filed as Exhibit 99.2 hereto.

(b)   Reports on Form 8-K:  The following Current Reports on Form 8-K were
      filed by the Registrant  during the last quarter of 1997.

A Current  Report on Form 8-K, dated December 3, 1997, was filed for the purpose
of filing the Monthly Certificateholder  Statements for payments made on October
20, 1997 and  November  20, 1997,  respectively.  A Current  Report on Form 8-K,
dated  January  5,  1998,  was  filed for the  purpose  of  filing  the  Monthly
Certificateholder  Statement  for payment made on December  22, 1997.  The items
reported in such Current Report were Item 5 (Other Events).

(c)      Exhibits to this report are listed in Item (14)(a)(3) above.




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SIGNATURE

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  registrant  has duly  caused  this report to be signed on its
behalf by the undersigned thereunto duly authorized.
   
                                 THE CHASE MANHATTAN BANK,
                                  not in its individual capacity but solely as
                                  Trustee under the Agreement referred to herein

Date: August 24, 1998       By:  /s/  Norma Catone
                                 -----------------------------------
                                   Norma Catone
                                   The Chase Manhattan Bank
                                   Vice President


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INDEX TO EXHIBITS

Exhibit
Number           Description of Exhibits                        Page

99.1      Annual Statement of Compliance                         6              

99.2      Annual Servicing Report                                8




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                                  EXHIBIT 99.1

                         ANNUAL STATEMENT OF COMPLIANCE




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<PAGE>

First Union National Bank
Structured Products and Servicing
NC0828
301 South College Street, TW-9
Charlotte, North Caroline 28288-0828
704 374-2487
Fax 704 383-0387
Toll Free 800 786-9819


                             OFFICER'S CERTIFICATE

     Reference is hereby made to that certain  Pooling and  Servicing  Agreement
dated as of June 1,  1997 by and  among  Credit  Suisse  First  Boston  Mortgage
Securities  Corp., as Depositor,  First Union National Bank as Servicer,  Lennar
Partners,  Inc., as Special  Servicer,  and The Chase Manhattan Bank, as Trustee
with respect to Commercial Mortgage  Pass-Through  Certificates,  Series 1997-C1
(the  "Agreement").  Capitalized  terms used herein not otherwise  defined shall
have the meanings assigned in the Agreement.

     Pursuant to Section  3.13 of this  Agreement I,  Timothy E.  Steward,  Vice
President of First Union National Bank, as Servicer (the "Servicer"),  do hereby
certify that:

  1. A review of the servicing operations of the Servicer during the period 
     from June 30, 1997 and through December 231, 1997 and of performance 
     under the Agreement during such period has been made under my supervision;

  2. To the best of my knowledge, based on such review, the Servicer has 
     fulfilled all its obligations under the Agreement in all material respects
     throughout the period June 30, 1997 through December 31, 1997.

  3. To the best of my knowledge, each related sub-servicer has fulfilled its 
     obligations under its sub-servicing agreement in all material respects 
     throughout the period June 30, 1997 through December 31, 1997.

  4. The Servicer has received no notice regarding qualification, or
     challenging the status, of the Upper-Tier REMIC or Lower-Tier REMIC as a 
     REMIC from the Internal Revenue Service or any other governmental agency 
     or body.

     IN WITNESS WHEREOF, the undersigned has executed this Certificate as of 
the 25th day of March 1998.


BY: /s/ Timothy E. Steward
---------------------------
Timothy E. Steward
Vice President
First Union National Bank

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<PAGE>




                                  EXHIBIT 99.2

                            ANNUAL SERVICING REPORTS




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<PAGE>

First Union National Bank
Structured Products and Servicing
NC0828
301 South College Street, TW-9
Charlotte, North Caroline 28288-0828
704 374-2487
Fax 704 383-0387
Toll Free 800 786-9819



                        MANAGEMENT'S ASSERTION REGARDING
                  COMPLIANCE WITH MINIMUM SERVICING STANDARDS

     As of and for the year ended December 31, 1997, First Union National Bank's
Commercial  Loan  Servicing  Division (the Company) has complied in all material
respects with the minimum servicing  standards set forth in the Mortgage Bankers
Association of America's (MBA's) Uniform Single Attestation Program for Mortgage
Bankers (USAP), except for the minimum servicing standards V.4. and VI.1., which
the MBA has interpreted as being inapplicable to the servicing of commercial and
multifamily  loans.  As of and for this same  period,  the Company had in effect
fidelity bond and errors and  omissions  policies in the amounts of $100 million
and $20 million, respectively.

BY: /s/ Timothy S. Ryan
-------------------------
Timothy S. Ryan                         March 6, 1998
Vice President
First Union National Bank


BY: /s/John M. Church
-------------------------
John M. Church                          March 6, 1998
Senior Vice President
First Union National Bank            



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KPMG PEAT MARWICK LLP
SUITE 2800
TWO FIRST UNION CENTER
CHARLOTTE, NC  28262-8290


                        Independent Accountant's Report



The Board of Directors
First Union National Bank:

We have examined  management's  assertion about First Union National Bank's
Commercial Loan Servicing  Division's (the Company)  compliance with the minimum
servicing standards  identified in the Mortgage Bankers Association of America's
Uniform  Single  Attestation  Program for Mortgage  Bankers  (USAP),  except for
minimum  servicing  standards V.4. and VI.1.,  which the MBA has  interpreted as
being  inapplicable to the servicing of commercial and multifamily  loans, as of
and for the year ended December 31, 1997 included in the accompanying management
assertion.  Management is responsible for the Company's  compliance with minimum
servicing standards. Our responsibility is to express an opinion on management's
assertion about the Company's compliance based on our examination.

Our examination was made in accordance with standards established by the 
American Institute of Certified Public Accountants and, accordingly, included
examining, on a test basis, evidence about the Company's compliance with the
appliable minimum servicing standards and performing such other procedures
as we considered necessary in the circumstances.  We believe that our 
examiniation provides a reasonable basis for our opinion.  Our examiniation does
not provide a legal determination on the Company's compliance with the
applicable minimum servicing standards. 

In our opinion, management's assertion that the Company complied with the
aforementioned applicable minimum servicing standards as of and for the year
ended December 31, 1997 is fairly stated, in all material respects. 


/s/ KPMG Peat Marwick LLP
-------------------------
KPMG Peat Marwick LLP
March 6, 1998


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