UNITED STATES
                       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, 2004

[ ]   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 333-115858-21

                    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.)


745 Seventh Avenue, 7th Floor
New York, NY                                              10019
(Address of principal executive offices)                 (Zip Code)

Registrant's telephone number, including area code : (212) 526-7000

                 Structured Adjustable Rate Mortgage Loan Trust
               Mortgage Pass-Through Certificates Series 2004-15
            (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]

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Exchange Act Rule 12b-2). Yes  No [X]

State the aggregate market value of the voting and non-voting common equity held
by non-affiliates  computed by reference to the price at which the common equity
was last sold, or the average bid and asked price of such common  equity,  as of
the last business day of the registrant's most recently  completed second fiscal
quarter.     Not Applicable.

Indicate the number of shares outstanding of each of the registrant's classes of
common stock, as of the latest practicable date.      Not Applicable.

                      Documents Incorporated by Reference

List hereunder the following documents if incorporated by reference and the Part
of the Form 10-K  (e.g.  Part I, Part II,  etc.)  into  which  the  document  is
incorporated:  (1)Any  annual  report  to  security  holders;  (2) Any  proxy or
information  statement;  and (3)Any  prospectus filed pursuant to Rule 424(b) or
(c) under the  Securities Act of 1933.  The listed  documents  should be clearly
described for  identification  purposes (e.g.  annual report to security holders
for fiscal year ended December 24, 1980).           Not Applicable.


<PAGE>

PART I

Item 1.  Business.

         Not Applicable.

Item 2.  Properties.

         Not Applicable.

Item 3.  Legal Proceedings.

     The Registrant is not aware of any material legal  proceeding  with respect
to, the Company,  the Master Servicer,  the Servicers or the Trustee, as related
to the Trust.

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

     No matter was  submitted  to a vote or consent of the 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, Related Stockholder Matters and
         Issuer Purchases of Equity Securities.

     The Trust does not issue stock. There is currently no established secondary
market for the  Certificates.  As of December 31, 2004, the number of holders of
each Class of Offered Certificates was 16.

Item 6.  Selected Financial Data.

         Not Applicable.

Item 7.  Management's Discussion and Analysis of Financial Condition and
         Results of Operation.

         Not Applicable.

Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

         Not Applicable.

Item 8.  Financial Statements and Supplementary Data.

         Not Applicable.

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

         None.

Item 9A. Controls and Procedures.

         Not Applicable.

Item 9B. Other Information.

         None.

                                      -2-
<PAGE>

PART III

Item 10. Directors and Executive Officers of the Registrant.

         Not Applicable.

Item 11. Executive Compensation.

         Not Applicable.

Item 12. Security Ownership of Certain Beneficial Owners and Management.

         Not Applicable.

Item 13. Certain Relationships and Related Transactions.

         No reportable transactions have occurred.

Item 14. Principal Accounting Fees and Services.

         Not Applicable.

PART IV

Item 15. Exhibits, Financial Statement Schedules.

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

    (1) Financial Statements:

         Not Applicable.

    (2)  Financial Statement Schedules:

         Not Applicable.

    (3)  Exhibits:

     Rule 13a-14(a)/15d-14(a) Certification, filed as 33.1 hereto.

     Annual  Independent  Accountants'  Servicing Report,  filed as Exhibit 99.1
        hereto.

     Report of  Management as to Compliance  with Minimum  Servicing  Standards,
        filed as Exhibit 99.2 herto.

     Annual Statement as to Compliance, filed as Exhibit 99.3 hereto.

     Aggregate Statement of Principal and Interest Distributions to
       Certificateholders as of December 31, 2004, filed as Exhibit 99.4 hereto.

(b) Exhibits to this report are listed in Item (15)(a)(3) above.

(c) Not Applicable.
                                      -3-

<PAGE>

Structured  Adjustable  Rate  Mortgage  Loan Trust
Mortgage Pass-Through Certificates Series 2004-15
-----------------------------------------------------------------------------


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.


               By:  Aurora Loan Services LLC (fka Aurora Loan Services Inc.),
                      as Master Servicer
                   /s/ E. Todd Whittemore
                   --------------------------------------
             Name:  E. Todd Whittemore
            Title:  Executive Vice President

             Date:  March 30, 2005



                                      -4-
<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.

                                      -5-
<PAGE>


                                 EXHIBIT INDEX

Exhibit Description

33.1    Rule 13a-14(a)/15d-14(a) Certification

99.1    Annual Independent Accountant's Servicing Report

        Aurora Loan Services LLC (fka Aurora Loan Services Inc.), as Servicer
        CitiMortgage,  Inc., as Servicer
        Colonial Savings, F.A., as Servicer


99.2    Report of Management as to Compliance with Minimum Servicing Standards

        Aurora Loan Services LLC (fka Aurora Loan Services Inc.), as Servicer
        CitiMortgage,  Inc., as Servicer
        Colonial Savings, F.A., as Servicer


99.3    Annual Statement as to Compliance

        Aurora Loan Services LLC (fka Aurora Loan Services Inc.),
                as Master Servicer

99.4    Aggregate Statement of Principal and Interest Distributions to
           Certificateholders as of December 31, 2004

                                      -6-
<PAGE>

                                  Exhibit 33.1
                     Rule 13a-14(a)/15d-14(a) Certification
                                 -------------

                                  Certification
                 Structured Adjustable Rate Mortgage Loan Trust
               Mortgage Pass-Through Certificates Series 2004-15

     I, E. Todd Whittemore, Executive Vice President of Aurora Loan Services LLC
(fka Aurora Loan Services Inc.), certify that:

     1. I have reviewed this annual report on Form 10-K, and all reports on Form
8-K  containing  distribution  or servicing  reports filed in respect of periods
included in the year covered by this annual  report,  of  Structured  Adjustable
Rate Mortgage Loan Trust Mortgage Pass-Through Certificates Series 2004-15;

     2. Based on my knowledge,  the  information  in these  reports,  taken as a
whole, does not contain any untrue statement of a material fact or omit to state
a  material  fact  necessary  to make  the  statements  made,  in  light  of the
circumstances  under which such  statements  were made, not misleading as of the
last day of the period covered by this annual report;

     3.  Based  on my  knowledge,  the  distribution  or  servicing  information
required to be provided  to the  trustee by the  servicer  under the pooling and
servicing, or similar,  agreement, for inclusion in these reports is included in
these reports;

     4. I am responsible for reviewing the activities  performed by the servicer
under the  pooling  and  servicing,  or  similar,  agreement  and based  upon my
knowledge and the annual  compliance  review required under that agreement,  and
except as disclosed in the reports,  the servicer has fulfilled its  obligations
under that agreement; and

     5. The  reports  disclose  all  significant  deficiencies  relating  to the
servicer's compliance with the minimum servicing standards based upon the report
provided by an  independent  public  accountant,  after  conducting  a review in
compliance with the Uniform Single  Attestation  Program for Mortgage Bankers or
similar  procedure,  as set forth in the  pooling  and  servicing,  or  similar,
agreement, that is included in these reports.

     In giving the certifications above, I have reasonably relied on information
provided  to me by  the  following  unaffiliated  parties:  CitiMortgage,  Inc.,
Colonial Savings, F.A., as Servicer, and JPMorgan Chase Bank, N.A., as Trustee.



Date: March 30, 2005

  By: /s/ E. Todd Whittemore
      ------------------------
     E. Todd Whittemore
     Executive Vice President
     Aurora Loan Services LLC (fka Aurora Loan Services Inc.)


                                      -7-

                                  EXHIBIT 99.1
                Annual Independent Accountants' Servicing Report


<page>

Ernst & Young LLP
Suite 3300
370 17th Street
Denver, Colorado  80202-5663
Telephone:  (720) 931-4000
Facsimile:  (720) 931-4444
www.ey.com


                       Report of Independent Accountants

Board of Directors
Aurora Loan Services Inc.

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 servicing  standards  identified in Exhibit A to the Report of
Management (the  "specified  minimum  servicing  standards") as set forth in the
Mortgage Bankers Association of America's Uniform Single Attestation Program for
Mortgage Bankers ("USAP") during the year ended November 30, 2004. Management is
responsible for the Company's  compliance with those specified 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
specified 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  specified  minimum
servicing standards.

In our  opinion,  management's  assertion  that the Company  complied  with the
aforementioned  specified  minimum  servicing  standards  during  the year ended
November 30, 2003, is fairly stated, in all material respects.


By:  /s/ Ernst & Young LLP
---------------------------
February 11, 2005


<page>


KPMG
Suite 900                                       Telephone  314-444-1400
10 South Broadway                               Fax        314-444-1470
St. Louis, MO  63102-1761                       Internet www.us.kpmg.com


                        Independent Accountants' Report

The Boards of Directors
CitiMortgage, Inc. and CitiMortgage Asset Management, Inc.:

We have examined management's assertion, included in the accompanying management
assertion,  that  CitiMortgage,  Inc. and subsidiaries  and  CitiMortgage  Asset
Management,  Inc. (collectively  referred to as 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, as of and for
the year ended December 31, 2004.  Management is  responsible  for the Company's
compliance with those 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  conducted  in  accordance  with   attestation   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 minimum servicing  standards  specified above 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 minimum servicing standards.

In our  opinion,  management's  assertion  that the  Company  complied  with the
aforementioned minimum servicing standards as of and for the year ended December
31, 2004, is fairly stated, in all material respects.


By:  /s/  KPMG
--------------------
St. Louis, Missouri
March 4, 2005

<page>



                       PAYNE FALKNER SMITH & JONES, P.C.
                       ---------------------------------
                          Certified Public Accountants


Report of Independent Auditors on Compliance with Requirements of the Uniform
                 Single Attestation Program for Mortgage Bankers


Board of Directors and Stockholder
of Colonial Savings, F.A.

We examined  management's  assertion about Colonial Savings,  F.A.  ("Colonial")
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  September 30, 2004,  included in
the accompanying management's assertion about Colonial's compliance based on our
examination.

Our examination was made in accordance with attestation standards established by
the  American  Institute  of  Certified  Public  Accountants  and,  accordingly,
included examining,  on a test basis,  evidence about Colonial'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  Colonial's   compliance  with  the  minimum  servicing
standards.

In  our  opinion,   management's  assertion  that  Colonial  complied  with  the
aforementioned  minimum  servicing  standards  as of  and  for  the  year  ended
September 30, 2004, is fairly stated, in all material aspects.

/s/ Payne Falkner Smith & Jones, P.C.
--------------------------------------
November 10, 2004


<page>


Deloitte & Touche LLP
Suite 1800
150 Fayetteville Street Mall
Raleigh, NC  27601
USA
www.deloitte.com


REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Board of Directors of
RBC Centura Banks, Inc.

We have examined management's assertion that RBC Centura Bank (the
"Company") has complied as of and for the year ended December 31, 2004, with its
established minimum servicing standards described in the accompanying
Management's Assertion, dated March 27, 2005. Management is responsible for the
Company's compliance with those minimum servicing standards. Our responsibility
is to express an opinion on the Company's compliance based on our examination.

Our examination was conducted in accordance with attestation standards
established by the American Institute of Certified Public Accountants as adopted
by the Public Company Accounting Oversight Board and, accordingly, included
examining, on a test basis, evidence about the Company's compliance with its
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 its minimum servicing
standands.

In our opinion, management's assertion that the Company complied with the
aforementioned minimum servicing standards as of and for the year ended December
31, 2004, is fairly stated, in all material respects based on the criteria set
for Appendix I.

By:  /s/ Deloitte & Touche LLP
---------------------------
March 29, 2005


<page>

                                  EXHIBIT 99.2
     Report of Management as to Compliance with Minimum Servicing Standards

<page>


Aurora Loan Services

                              Report of Management

We, as members of management of Aurora Loan Services, Inc. (the  "Company"), are
responsible  for  complying  with  the  servicing  standards  identified  in the
attached Exhibit A (the "specified minimum servicing standards") as set forth in
the Mortgage Bankers Association of America's Uniform Single Attestation Program
for Mortgage  Bankers  (USAP).  We are also  responsible  for  establishing  and
maintaining  effective  internal  control over  compliance  with these specified
minimum  servicing  standards.  We have performed an evaluation of the Company's
compliance  with the specified  minimum  servicing  standards as of November 30,
2004 and for the year then  ended.  Based on this  evaluation,  we  assert  that
during the year ended November 30, 2004, the Company  complied,  in all material
respects, with the specified minimum servicing standards.

As of and for this same period, the Company had in effect a fidelity bond and an
errors and omissions policy in the amounts of $60 million and 470, million,
respectively.

                                Very truly yours,

                                /s/ Bruce Witherell
                                ---------------------------
                                Bruce Witherell
                                Chief Executive Officer

                                /s/ Rick W. Skogg
                                ----------------------------
                                Rick W. Skogg
                                Co-Chief Operating Officer

                                /s/ Roy Browning
                                -----------------------------
                                Roy Browning
                                Chief Financial Officer

                                /s/ William Napier
                                ---------------------------
                                William Napier
                                Controller


February 11, 2005


                                                                   Exhibit A
                     Specified Minimum Servicing Standards

I.   Custodial Bank Accounts

1.   Reconciliations shall be prepared on a monthly basis for all custodial bank
     accounts and related bank clearing accounts. These reconciliations shall:

        a.   be mathematically accurate;

        b.   be prepared within forty-five (45) calendar days after the cutoff
             date. The cutoff  date is the date as of which a bank  account  is
             reconciled  every  month. It may, or may not, coincide with a
             prescribed  investor  reporting date but shall be consistent from
             period to period;

        c.   be reviewed and approved by someone  other than the person who
             prepared the reconciliation; and

        d.   document  explanations for reconciling items. These reconciling
             items shall  be  resolved   within  ninety  (90) calendar days  of
             their original  identification.

2.   Funds of the servicing  entity shall be advanced in cases where there is an
     overdraft in an investor's or a mortgagor's account.

3.   Each  custodial   account  shall  be  maintained  at  a  federally  insured
     depository institution in trust for the applicable investor.

4.   Escrow  funds  held in  trust  for a  mortgagor  shall be  returned  to the
     mortgagor within thirty (30) calendar days of payoff of the mortgage loan.

II.  Mortgage Payments

1.   Mortgage  payments  shall be deposited into the custodial bank accounts and
     related bank clearing accounts within two (2) business days of receipt.

2.   Mortgage  payments made in accordance with the  mortgagor's  loan documents
     shall be posted to the applicable mortgagor records within two (2) business
     days of receipt.

3.   Mortgage  payments  shall be allocated to principal,  interest,  insurance,
     taxes or  other  escrow  items in  accordance  with  the  mortgagor's  loan
     documents.

4.   Mortgage  payments  identified  as  loan  payoffs  shall  be  allocated  in
     accordance with the mortgagor's loan documents.

III. Disbursements

1.   Disbursements  made via wire  transfer on behalf of a mortgagor or investor
     shall be made only by authorized personnel.

2.   Disbursements  made on behalf of a mortgagor  or  investor  shall be posted
     within two (2)  business  days to the  mortgagor's  or  investor's  records
     maintained by the servicing entity.

3.   Tax and  insurance  payments  shall be made on or  before  the  penalty  or
     insurance policy  expiration dates, as indicated on tax bills and insurance
     premium notices, respectively, provided that such support has been received
     by the  servicing  entity at least thirty (30) calendar days prior to these
     dates.

4.   Any late payment  penalties paid in conjunction with the payment of any tax
     bill or insurance premium notice shall be paid from the servicing  entity's
     funds and not charged to the mortgagor,  unless the late payment was due to
     the mortgagor's error or omission.

5.   Amounts  remitted to investors per the  servicer's  investor  reports shall
     agree with cancelled  checks,  or other form of payment,  or custodial bank
     statements.

6.   Unissued checks shall be safeguarded so as to prevent unauthorized access.

IV.  Investor Accounting and Reporting

1.   The servicing  entity's investor reports shall agree with, or reconcile to,
     investors'  records  on a monthly  basis as to the total  unpaid  principal
     balance and number of loans serviced by the servicing entity.

V.   Mortgagor Loan Accounting

1.   The servicing entity's mortgage loan records shall agree with, or reconcile
     to, the records of mortgagors with respect to the unpaid principal  balance
     on a monthly basis.

2.   Adjustments on adjustable rate mortgage (ARM) loans shall be computed based
     on the related mortgage note and any ARM rider.

3.   Escrow accounts shall be analyzed,  in accordance with the mortgagor's loan
     documents, on at least an annual basis.

4.   Interest on escrow  accounts  shall be paid, or credited,  to mortgagors in
     accordance with the applicable state laws.

VI.  Delinquencies

1.   Records  documenting  collection  efforts  shall be  maintained  during the
     period a loan is in default  and shall be undated  at least  monthly.  Such
     records shall  describe the entity's  activities  in monitoring  delinquent
     loans  including,  for example,  phone calls,  letters and mortgage payment
     rescheduling  plans in cases  where the  delinquency  is  deemed  temporary
     (i.e., illness or unemployment).

VII. Insurance Policies

1.   A fidelity bond and errors and  omissions  policy shall be in effect on the
     servicing entity  throughout the reporting period in the amount of coverage
     represented to investors in management's assertion.


<page>

CitiMortgage, Inc.
1000 Technology Drive
Mail Staton 822
O'Fallon, Missouri 63304


                        MANAGEMENT ASSERTION

As of and  for  the  year  ended  December  31,  2004,  CitiMortgage,  Inc.  and
subsidiaries and CitiMortgage Asset Management,  Inc.  (collectively referred to
as the  Company)  has  complied,  in all  material  respects,  with the  minimum
servicing  standards set forth in the Mortgage Bankers  Association of America's
Uniform Single Attestation for Mortgage Bankers. As of and for this same period,
the Company had in effect a fidelity  bond policy of $300 million and errors and
omissions policy in the amount of $50 million.


Very truly yours,

By:   /s/ David Schneider
      ----------------------
      David Schneider, President & Chief Operating Officer of CitiMortgage, Inc.

By:   /s/ Bill Beckmann
      ----------------------
      Bill Beckmann, President, CitiGroup Real Estate Servicing and Technology

By:   /s/ Arlene Hyde
      ----------------------
      Arlene Hyde, Managing Director Servicing Division of Citigroup Real
      Estate Servicing and Technology

By:   /s/ Paul Ince
      ----------------------
      Paul Ince, Chief Financial Officer of CitiMortgage, Inc.

March 4, 2005


<page>

    Management's Assertion Concerning Compliance with USAP Minimum Servicing
                                   Standards

November 10, 2004


As of and for the year ended September 30, 2004, Colonial Savings, F.A. 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 this same period, Colonial Savings, F.A. had in effect a fidelity
bond and errors and omissions policy in the amount of $10,000,000.


/s/ Jim E. DuBose
-----------------
Jim E. DuBose
President and Chief Executive Officer

/s/ Ben Dempsey
---------------
Ben Dempsey
Senior Vice President and Chief Financial Officer


<page>

RBC Centura                                     Mortgage Loan Administration
                                                P. O. Box 7000
                                                Rocky Mount, NC  27802-0700

                                                                Exhibit I



                             Management's Assertion


March 27, 2005

As of and for the year ended December 31, 2004, RBC Centura Bank (the
"Company"), has complied in all material respects with the Company's established
minimum servicing standards for residential mortgage loans as set forth in the
Appendix I (the "Standards"). The Standards are based on the Mortgage Banker's
Association of America's Uniform Single Attestation Program for Mortgage
Bankers.

As of and for this same period, the Company had in effect a fidelity bond
in the amount of $15,000,000 single, $30,000,000 aggregate liability and errors
and omissions policy in the amount of $15,000,000 aggregate liability.



/s/ Scott M. Custer
---------------------------------------------
Scott M. Custer, Chief Executive Officer


Terry S. Earley
-------------------------------------------
/s/ Terry S. Earley, Chief Financial Officer


/s/ Andrea Bolger
-----------------------------------------------
Andrea Bolger, Chief Credit and Risk Officer


Philip S. Einhorn
----------------------------------------------
Philip S. Einhorn, Vice President of Servicing
<page>


                                  EXHIBIT 99.3
                       Annual Statement as to Compliance


Aurora Loan Services
a Lehman Brothers Company

Via UPS

February 25, 2005

Diane Wallace
JPMorgan Chase Bank
4 New York Plaza, 6th floor
New York, NY 10004

RE:      SASCO Series 2002-21A, 2002-25A, 2002-27A, 2003-2A, 2003-BC1, 2003-BC2,
         2003-9A, 2003-AM1, 2003-24A, 2003-BC3, 2003-31A, 2003-37A, 2003-40A
         SARM Series:  2004-2, 2004-3AC, 2004-6, 2004-8, 2004-11, 2004-13,
         2004-15, 2004-17
         Annual Officer's Certificate as to Compliance

Dear Ms. Wallace:

     The  undersigned  Officer  certifies the following for the period ending on
December 31, 2004:

     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,  or, if any such  certificate  or report has not been received by the
Master  Servicer,  the Master Servicer is using its best  reasonable  efforts to
obtain such certificate or report.

Certified By:

/s/ R. Peter Karr
---------------------------
R. Peter Karr
Senior Vice President
Master Servicing Division

<page>

                                  EXHIBIT 99.4
         Aggregate Statement of Principal and Interest Distributions to
                   Certificateholders as of December 31, 2004

<TABLE>
<S>     <C>    <C>    <C>    <C>    <C>    <C>

-----------------------------------------------------------------------------------------------------------------------------------
                                  DISTRIBUTION IN DOLLARS
-----------------------------------------------------------------------------------------------------------------------------------
CUSIP        ORIGINAL PRIN        PAID PRIN          PAID INT          TOTAL PAID    ENDING PRIN BALANCE      CERT POOL FACTOR

863579DE5    202,611,000.00      21,407,738.97     3,462,388.51     24,870,127.48         181,203,261.03             894.34068748
863579DF2      4,997,000.00           2,716.88        58,981.46         61,698.34           4,994,283.12             999.45629778
863579DG0      3,476,000.00           1,889.90        47,674.94         49,564.84           3,474,110.10             999.45630035
863579DH8      2,498,000.00           1,358.17        41,691.13         43,049.30           2,496,641.83             999.45629704
863579DJ4     10,969,773.38               0.00        58,119.54         58,119.54          10,969,773.38           1,000.00000000
863579DK1            100.00             100.00             0.68            100.68                   0.00               0.00000000
863579DL9      1,738,000.00             944.96        31,074.65         32,019.61           1,737,055.04             999.45629459
863579DM7      1,086,000.00             590.45        19,417.19         20,007.64           1,085,409.55             999.45630755
863579DN5        871,817.00             474.00        15,587.70         16,061.70             871,343.00             999.45630792
N/A105145              0.00               0.00         4,489.50          4,489.50                   0.00           1,000.00000000
U8599YAL6              0.01               0.00             0.00              0.00                   0.01           1,000.00000000
U8599YAM4              0.01               0.00             0.00               0.00                  0.01           1,000.00000000
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>