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 fiscal year ended December 31, 1999

[ ]     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  333-68513-03

                    STRUCTURED ASSET SECURITIES CORPORATION
             (Exact name of registrant as specified in its charter)

         Delaware                                           74-2440850
(State or other jurisdiction of                           I.R.S. Employer
incorporation or organization)                            Identification No.)


200 Vessey Street
New York, NY                                              10285
(Address of principal executive offices)                 (Zip Code)

Registrant's telephone number, including area code : (212) 526-5594

   Structured Asset Securities Corporation Mortgage Pass-Through Certificates
                                Series 1999-ALS1
            (Title of each class of securities covered by this Form)

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 the Form 10-K/A or any amendment to
this Form 10-K/A. [X]

Documents incorporated by reference:  None



<PAGE>

Structured Asset Securities Corporation Mortgage Pass-Through Certificates
Series 1999-ALS1
--------------------------------------------------------


PART IV

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

(a) The following documents are filed as part of this report:

    (1) Financial Statements:

         Omitted.

    (2)  Financial Statement Schedules:

         Omitted.

    (3)  Exhibits:

     Annual  Servicer  Statement of  Compliance, filed as Exhibit 99.1 hereto.
     Annual Statement of  Independent  Accountants Report for the Servicer,
        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 1999.

     Current Reports on Form 8-K, dated, October 27, 1999, November 26, 1999 and
     December 27, 1999, were filed for the purpose of filing the Monthly
     Statement sent to the Holders of the Offered  Certificates for payments
     made on the same dates. 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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<PAGE>


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:  December 5, 2000          By: /s/ Kimberly K Costa
                                    -----------------------------------
                                    Kimberly K Costa
                                    Vice President




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<PAGE>
INDEX TO EXHIBITS

Exhibit
Number           Description of Exhibits

99.1      Annual Statement of Compliance

99.2      Annual Independent Public Accountant's Servicing Report



                                      -4-



                                  EXHIBIT 99.1

                         ANNUAL STATEMENT OF COMPLIANCE




                                      -5-



Aurora Loan Services Inc
Corporate Headquarters
2530 S. Parker Rd., Suite 601
Aurora, CO  80014
Phone 303-632-3000


May 10, 2000

Capital Markets Fidiciary Services
The Chase Manhattan Bank
450 West 33rd Street, 14th Floor
New York, NY 10001-2697

RE:    SASCO Series 1998-ALS1, Series 1999-ALS1, and Series 1999-ALS2
       Annual Officer's Certificate as to Compliance

Dear Capital Markets Fidiciary Services Manager:

The undersigned Officer certifies the following for the period ending on
December 31, 1999:

     1. I have reviewed the  activities and  performance of the Master  Servicer
during the preceding calendar year under the terms of the Trust Agreements and
to the best of this Officer's  knowledge,  the Master Servicer has fulfilled all
of its duties,  responsibilities  or obligations under the Agreements;

     2. Based on said review and to the best of this  Officer's  knowledge,  the
Master  Servicer  is not in  default of its  obligations  under the terms of the
Trust Agreements  in any  material  respect,  or, if there is a  default  in the
fulfillment of its obligations, a description of each default or failure and the
nature and status  thereof has been reported to this Officer;


     3. To the best of this Officer's knowledge,  nothing has arose to lead this
Officer to believe  that its Servicer  has failed to perform  any of its duties,
responsibilities  and  obligations  under its  Servicing  Agreement  during  the
preceding calendar year;

     4. To the best of this Officer's knowledge,  the Servicer is not in default
of its  obligations  under the terms of its Servicing  Agreement in any material
respect,  or, if there is a default in the  fulfillment  of its  obligations,  a
description  of each  default or failure  and the nature and status  thereof has
been reported to this Officer;

     5. The Master  Servicer has  received  from its  Servicer  such  Servicer's
annual certificate  of compliance  and a copy of such  Servicer's  annual audit
report,  in each case to the  extent  required  under the  applicable  Servicing
Agreement.

Certified By:

By: /s/ E. Todd Whittemore
        Sr Vice President, Master Servicing

                                      -6-

<PAGE>


                                  EXHIBIT 99.2

              Annual Independent Public Accountant's Servicing Report

                                      -7-





Ernest & Young LLP                                         phone: 303 534-4300
Suite 400                                                   fax: 303 354-6750
370 17th Street
Denver, Colorado 80202-5663

                 Report on Management's Assertion on Compliance
               with Minimum Servicing Standards Set Forth in the
            Uniform Single Attestation Program for Mortgage Bankers

                       Report of Independent Auditors

Board of Directors
Aurora Loan Services Inc.

by: s/s Ernest & Young LLP

     We have  examined  management's  assertion,  included  in the  accompanying
report  titled  Report of  Management,  that  Aurora  Loan  Services  Inc.  (the
"Company")  complied  with the  minimum  servicing  standards  set  forth in the
Mortgage Bankers Association of America's Uniform single Attestation Program for
Mortgage Bankers ("USAP") during the year ended November 30, 1999. Management is
responsible  for  the  Company's   compliance  with  those   requirements.   Our
responsibility  is to express an opinion on  management's  assertions  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 those
requirements 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 specified requirements.

     In our opinion,  management's  assertion that the Company complied with the
aforementioned  requirements  during the year ended November 30, 1999, is fairly
stated, in all material respects.

February 18, 2000

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