SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 10-K

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

Documents incorporated by reference:  None



<PAGE>

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

PART I

Item 1.  Business

         Omitted.

Item 2.  Properties

         Omitted.

Item 3.  Legal Proceedings

     The Registrant is not aware of any material legal  proceeding  with respect
to a Pool, the Trustee, the Servicer or, Structured Asset Securities Corporation
with respect to a Pool, other than ordinary routine litigation incidental to the
duties of the  Trustee or  Servicer  under the  related  Pooling  and  Servicing
Agreement.

Item 4.  Submission of Matters to a Vote of Security Holders

     No matter  was  submitted  to a vote or consent of holders of each Class of
Offered Certificates during the fiscal year covered by this report.

PART II

Item 5.  Market for Registrant's Common Equity and Related Stockholder Matters

     The Trust does not issue stock. There is currently no established secondary
market for the  Certificates.  As of December 31, 1999, the number of holders of
each Class of Offered Certificates was 14.

Item 6.  Selected Financial Data

         Omitted.

Item 7.  Management's Discussion and Analysis of Financial condition and
         Results of Operations

         Omitted.

Item 8.  Financial Statements and Supplementary Data

         Omitted.

Item 9.  Changes in and Disagreements with Accountants on Accounting and
         Financial Disclosure

     There was no change of accountants or disagreement  with accountants on any
matter of accounting principles or practices or financial disclosure.


<PAGE>

PART III

Item 10. Directors and Executive Officers of the Registrant

         Omitted.

Item 11. Executive Compensation

         Omitted.

Item 12. Security Ownership of Certain Beneficial Owners and Management

         Omitted.

Item 13. Certain Relationships and Related Transactions

         No reportable transactions have occurred.

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.


<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:  March 30, 2000          By: /s/ Kimberly K Costa
                                    -----------------------------------
                                    Kimberly K Costa
                                    Vice President




<PAGE>


SUPPLEMENTAL  INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO SECTION
15(D) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED SECURITIES PURSUANT TO
SECTION 12 OF THE ACT.

The  registrant  has not sent an annual report or proxy material to its security
holders.  The registrant  will not be sending an annual report or proxy material
to its security holders subsequent to the filing of this form.





                                 EXHIBIT INDEX

Exhibit     Description

 99.1       Annual Statement of Compliance
 99.2       Annual Independent Public Accountant's Servicing Report





EXHIBIT 99.1 - Servicer's Annual Statement of Compliance
  To be supplied upon receipt by the Trustee



EXHIBIT 99.2 - Annual Independent Public Accountant's Servicing Report
  To be supplied upon receipt by the Trustee