SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                   FORM 10-K/A
                                 Amendment No.1


(Mark One)

/     x / ANNUAL  REPORT  PURSUANT  TO  SECTION  13 OR  15(d) OF THE  SECURITIES
      EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 1999 or

/   / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
      SECURITIES EXCHANGE ACT OF 1934


      Commission File No.:   333-51771-03

Credit Suisse First Boston Mortgage Securities, Inc.
Commercial Mortgage Pass-Through Certificates Series 1999-C1
        (Exact name of registrant as specified in its charter)



New York                         52-2212068
                                 52-2212067
(State or other jurisdiction     (I.R.S. Employer
 of incorporation or              Identification  No.)
 organization)

c/o Wells Fargo Bank Minnesota, N.A.
11000 Broken Land Parkway
Columbia, Maryland                            21044
(Address of principal executive offices)     (ZIP Code)


Registrant's telephone number, including area code:
     (410) 884-2000

Securities to be registered pursuant to Section 12(b) of the Act:

     NONE

Securities to be 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 ___


This Amendment No. 1 on Form 10-K/A amends Item 14 of the original Annual Report
on Form 10-K (the  "Original  Form 10-K") filed on March 24, 2000,  on behalf of
Credit  Suisse  First  Boston  Mortgage  Securities,  Inc.  Commercial  Mortgage
Pass-Through Certificates Series 1999-C1 established pursuant to the Pooling and
Servicing  Agreement among Credit Suisse First Boston Mortgage Securities Corp.,
as Depositor, Chase Manhattan Bank as Trustee, and Wells Fargo Bank Minnesota,
National Association, as Servicer, Lenanar Partners, Inc., as Special Servicer,
and Wells Fargo Bank Minnesota, N.A., as Certificate  Administrator and
Custodian  pursuant to which the Credit Suisse First Boston Mortgage
Securities,  Inc. Commercial Mortgage  Pass-Through Certificates  Series
1999-C1  registered  under the  Securities Act of 1933 the "Certificates")
were issued.


Item 14 of the original Form 10K is amended in its entirety to read as follows:

Item 14.  Exhibits, Financial Statement Schedules, and Reports
          on Form 8-K.

          (a) Exhibits

              (99.1) Annual   Independent    Accountants'    Servicing   Reports
                     concerning servicing activities for the year ended December
                     31, 1999.

                   a)   Wells Fargo Bank, N.A., as  Servicer <F1>
                   b)   Lennar Partners, INC., as Special Servicer <F1>


              (99.2) Report  of  Management   as  to  Compliance   with  Minimum
                     Servicing Standards for the year ended December 31, 1999.

                   a)   Wells Fargo Bank, N.A., as Servicer <F1>
                   b)   Lennar Partners, INC., as Special Servicer <F1>

              (99.3) Annual  Statements  of  Compliance  under the  Pooling  and
                     Servicing Agreements for the year ended December 31, 1999.

                   a)   Wells Fargo Bank, N.A., as Servicer <F1>
                   b)   Lennar Partners, INC., as Special Servicer <F3>


              (99.4) Aggregate Statement of Principal and
                      Interest Distributions to Certificate Holders. <F2>

            (b)  On December 3, 1999 and December 29, 1999, reports on Form 8-K
                 were filed by the Company in order to provide the statements
                 for the monthly  distributions to holders of the Certificates.
                 No other reports on Form 8-K have been filed during the last
                 quarter of the period covered by this report.



            (c) Not applicable.

            (d)  Omitted.

<F1>  Filed herewith.
<F2>  Previously filed.
<F3>  Such document is not filed  herewith  since such document was not received
      by the reporting person.


                           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:


Credit Suisse First Boston Mortgage Securities
Commercial Mortgage Pass-Through Certificates Series 1999-C1

Signed:   The Chase Manhattan Bank, as Trustee

By:   Andreas Auer, Assistant Vice President
By:  /s/  Andreas Auer, Assistant Vice President

Dated:  June 7, 2001


Exhibit Index

Exhibit No.

99.1      Annual Independent Accountants' Servicing Reports concerning servicing
          activities for the year ended December 31, 1999.

                   a)   Wells Fargo Bank, N.A., as Servicer <F1>
                   b)   Lennar Partners, INC., as Special Servicer <F1>



99.2      Report of Management as to Compliance with Minimum Servicing Standards
          for the year ended December 31, 1999.

                   a)   Wells Fargo Bank, N.A., as  Servicer <F1>
                   b)   Lennar Partners, INC., as Special Servicer <F1>



99.3      Annual  Statements  of  Compliance  under the  Pooling  and  Servicing
          Agreements for the year ended December 31, 1999.

                   a)   Wells Fargo Bank, N.A., as Servicer <F1>
                   b)   Lennar Partners, INC., as Special Servicer <F3>



99.4      Aggregate Statement of Principal and Interest Distributions to
          Certificate Holders.<F2>

<F1>  Filed herewith.
<F2>  Previously filed.
<F3>  Such document is not filed  herewith  since such document was not received
      by the reporting person.


    EX-99.1 (a)
   Annual Independant Accountant's Servicing Report


(LOGO) KPMG

2500 Ruan Center
666 Grand Avenue
Des Moines, IA 50309

INDEPENDENT ACCOUNTANTS' REPORT

The Board of Directors
Norwest Mortgage, Inc.:

We  have  examined  management's  assertion  about  Norwest  Mortgage  Banking's
compliance  with the minimum  servicing  standards  identified  in the  Mortgage
Bankers Association of America's Uniform Single Attestation Program for Mortgage
Bankers (USAP) as of and for the year ended  December 31, 1999,  included in the
accompanying  management  assertion.   Management  is  responsible  for  Norwest
Mortgage  Banking's  compliance  with those  minimum  servicing  standards.  Our
responsibility  is to express an opinion  on  management's  assertion  about the
entity'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 Norwest Mortgage Banking's compliance
with the minimum servicing  standards and performing such other procedures as we
considered  necessary  in the  circumstances.  We believe  that our  examination
provides a reasonable basis for our opinion.  Our examination does not provide a
legal  determination on Norwest Mortgage  Banking's  compliance with the minimum
servicing standards.

In our opinion,  management's  assertion that Norwest  Mortgage Banking complied
with the aforementioned minimum servicing standards as of and for the year ended
December 31, 1999, is fairly stated, in all material respects.

January l8,2000

KPMG LLP

                    EX-99.1 (b)
                    Annual Independant Accountant's Servicing Report


(LOGO) Deloitte & Touche

Deloitte & Touche LLP
Certified Public Accountants
Suite 400
200 South Biscayne Boulevard
Miami, Florida 33131-2310
Telephone: (305) 358-4141
Facsimile: (305) 372-3160


INDEPENDENT ACCOUNTANTS' REPORT

To the Board of Directors of
Lennar Partners, Inc.:

We have  examined  management's  assertion  about Lennar  Partners,  Inc.'s (the
"Company")  compliance with the minimum  servicing  standards  identified in the
Mortgage Banker's  Association of America's Uniform Single  Attestation  Program
for Mortgage Bankers (USAP) as applicable to the special servicing of commercial
and  multifamily  mortgage  loans as of and for the year ended December 31, 1999
included in the accompanying management assertion. Management is responsible for
the Company's compliance with those applicable minimum servicing standards.  Our
responsibility  is to express an opinion  on  management's  assertion  about the
entity'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
applicable  minimum servicing  standards and performing such other procedures as
we considered  necessary in the  circumstances.  We believe that our examination
provides a reasonable basis for our opinion.  Our examination 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, 1999 is fairly stated, in all material respects.


Deloitte & Touche LLP


March 1, 2000


(LOGO) Deloitte Touche
       Tohmatsu



   EX-99.2 (a)
  Report of Management

(LOGO) NORWEST MORTGAGE

Norwest Mortgage, Inc.
Home Campus
Des Moines, IA 50328
515/221 - 7300

Management Assertion

As of, and for the year ended December 31, 1999,  Norwest  Mortgage  Banking has
complied in all material respects with the minimum servicing standards set forth
in the Mortgage  Bankers  Association of America's  Uniform  Single  Attestation
Program for Mortgage Bankers.  As of, and for the same period,  Norwest Mortgage
Banking had in effect a fidelity bond along with an errors and omissions  policy
in the amounts of $50 million and $10 million, respectively.

Pete Wissinger
President and Chief Operating Officer
January 8, 2000
Date

Robert K. Chapman
Executive Vice President and Chief Financial Officer
January 8, 2000
Date

Mike Heid
Executive Vice President Loan Servicing
January 8, 2000
Date





   EX-99.2 (b)
   Report of Management


(LOGO) LENNAR PARTNERS
An LNR Company

March 1, 2000

Norwest Bank Minnesota, N.A.
Corporate Trust Department,
11000 Broken Land Parkway,
Columbia, Maryland 21044-3562,

Attention: Corporate Trust Services (CMBS)-First Union Commercial Mortgage Trust
           Commercial Mortgage Pass-Through Certificates,
           FUNB Series 1999-C1

Re:        Annual Independent Public Accountant's Servicing Report
           FUNB Series 1999-C1
           Commercial Mortgage Pass-Through Certificates


To whom it may concern:

As of and for the year ended  December  31,  1999,  Lennar  Partners,  Inc.  has
complied  in  all  material  respects  with  the  applicable  minimum  servicing
standards set forth in the Mortgage  Bankers  Association  of America's  Uniform
Single Attestation Program for Mortgage Bankers applicable to the commercial and
multifamily  mortgages  for the special  servicer as noted in the  attachment to
this assertion.  As of and for this same period,  Lennar  Partners,  Inc. had in
effect a fidelity bond in the amount of  $7,500,000  and an errors and omissions
policy in the amount of $10,000,000.

Sincerely,

LENNAR PARTNERS, INC.

Susan K. Chapman
Vice President


CC: First Union Capital Markets Group,
    One First Union Center, DC6,
    Charlotte, North Carolina 28288-1075
    Attention:Craig Lieberman, First Union Commercial Mortgage Trust,
    Commercial Mortgage Pass-Through Certificates, FUNB Series 1999-C1

         760  Northwest  107th Avenue  Suite 400  Miami,  Florida 33172
                 Telephone: (305) 220-4300  Fax:  (205) 226-342





  EX-99.3 (a)
  Annual Statement of Compliance


(LOGO)WELLS FARGO BANK

1320 Willow Pass Rd., Suite 205
PO. Box 4036
Concord, CA 94524
(800) 986-9711


                        ANNUAL STATEMENT AS TO COMPLIANCE
                              OFFICER'S CERTIFICATE




Re: Credit Suisse First Boston Mortgage Securities Corp., Commercial Mortgage
Pass-Through Certificates, Series 1999-C 1

In accordance with Section 3.13 of that certain Pooling and Servicing  Agreement
dated  October 11, 1999  ("Agreement"),  executed by and between  Credit  Suisse
First  Boston  Mortgage  Securities  Corp.,  ("Depositor"),  Wells  Fargo  Bank,
National Association ("Servicer"), Lennar Partners ("Special Servicer"), and The
Chase Manhattan Bank ("Trustee"),  as authorized officer of Servicer,  I certify
that (i) a review of the activities and  performance of the Servicer  during the
preceding calendar year has been made under my supervision, and (ii) to the best
of my knowledge,  based on such review, Servicer has performed and fulfilled its
duties,  responsibilities  and  obligations  under the Agreement in all material
respects throughout such year.



Wells Fargo Bank, National Association
"Servicer"




By: Linda Fiduccia
Its: Senior Vice President

Date: April 10, 2000