UNITED STATES

SECURITIES AND EXCHANGE COMMISSION



Washington, D.C.  20549

FORM
10-K





(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, 2004

OR

[    ] 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:    333-115858-13

Structured Asset Securities Corporation

(Exact
Name of Registrant as Specified in its Charter)

|Delaware                                                   | 74-2440850                                
|---------------------------------------------------------- | ------------------------------------------
|(State or Other Jurisdiction
      Of
      Incorporation) | (I.R.S. Employer
      Identification No.)



|745 Seventh Avenue, 7th Floor
      New York, New York(Address of PrincipalExecutive Offices) | 10019
      (Zip Code)
|--------------------------------------------------------------------------------------------- | ----------------------



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

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates Series 2004-17XS

(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 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.

[X] Yes            [    ] 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 Rule 12b-2 of the Act).

[    ] Yes            [ X ] No





PART I

Item 1.

Business.

Not applicable.

Item 2.

Properties.

Not applicable.

Item 3.

Legal Proceedings.

There were no legal proceedings.

Item 4.

Submission of Matters to a Vote of Security Holders.

There were no matters submitted to a vote of the Security Holders.



PART II

Item 5.

Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

As of December 31, 2004, the Trust had 17 holders of record of the Certificates, computed in accordance with Rule 12g5-1 under the Securities Exchange Act of 1934,
as amended.

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.

Not applicable.

Item 9A.

Controls and Procedures.

Not applicable.

Item 9B.

Other Information.

Not applicable.



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 and Related Stockholder Matters.

Not applicable.

Item 13.

Certain Relationships and Related Transactions.

Not applicable.

Item 14.

Principal Accounting Fees and Services.

Not applicable.



PART IV

Item 15.

Exhibits, Financial Statement Schedules.

(a)

1. Not Applicable

2. Not Applicable

3. Exhibits

31.1 Sarbanes-Oxley Certification

99.1 Independent Accountant's Servicing Report for the year ended

(a) Aurora Loan Services LLC (formerly known as Aurora Loan Services Inc.), as Servicer(b) Chase Manhattan Mortgage Corporation, as Servicer(c) Colonial Savings, F.A., as Servicer(d) Greenpoint Mortgage Funding, Inc., as Servicer(e) National City Mortgage Co., as Servicer(f) Ocwen Federal Bank FSB, as Servicer(g) Third Federal Savings & Loan Association of Cleveland, as Servicer(h) Wachovia Mortgage Corporation, as Servicer

99.2 Report of Management as to compliance with minimum servicing standards for the year ended

(a) Aurora Loan Services LLC (formerly known as Aurora Loan Services Inc.), as Servicer(b) Chase Manhattan Mortgage Corporation, as Servicer(c) Colonial Savings, F.A., as Servicer(d) Greenpoint Mortgage Funding, Inc., as Servicer(e) National City Mortgage Co., as Servicer(f) Ocwen Federal Bank FSB, as Servicer(g) Third Federal Savings & Loan Association of Cleveland, as Servicer(h) Wachovia Mortgage Corporation, as Servicer

99.3 Annual Statement of Compliance for the year ended December 31, 2004

(a) Aurora Loan Services LLC (formerly known as Aurora Loan Services Inc.), as Master Servicer

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

(b)

See (a) 3 above

(c)

Not Applicable



SIGNATURES

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.

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2004-17XS

Date:

March 29, 2005

By:

/s/ E. Todd Whittemore

Name:

E. Todd Whittemore

Title:

Executive Vice President

Company:

Aurora Loan Services LLC (formerly known as Aurora Loan Services Inc.)





EXHIBIT INDEX

31.1 Sarbanes-Oxley Certification

99.1 Independent Accountant's Servicing Report for the year ended

(a) Aurora Loan Services LLC (formerly known as Aurora Loan Services Inc.), as Servicer(b) Chase Manhattan Mortgage Corporation, as Servicer(c) Colonial Savings, F.A., as Servicer(d) Greenpoint Mortgage Funding, Inc., as Servicer(e) National City Mortgage Co., as Servicer(f) Ocwen Federal Bank FSB, as Servicer(g) Third Federal Savings & Loan Association of Cleveland, as Servicer(h) Wachovia Mortgage Corporation, as Servicer

99.2 Report of Management as to compliance with minimum servicing standards for the year ended

(a) Aurora Loan Services LLC (formerly known as Aurora Loan Services Inc.), as Servicer(b) Chase Manhattan Mortgage Corporation, as Servicer(c) Colonial Savings, F.A., as Servicer(d) Greenpoint Mortgage Funding, Inc., as Servicer(e) National City Mortgage Co., as Servicer(f) Ocwen Federal Bank FSB, as Servicer(g) Third Federal Savings & Loan Association of Cleveland, as Servicer(h) Wachovia Mortgage Corporation, as Servicer

99.3 Annual Statement of Compliance for the year ended December 31, 2004

(a) Aurora Loan Services LLC (formerly known as Aurora Loan Services Inc.), as Master Servicer

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



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Exhibit 31.1: Sarbanes-Oxley Certification

Re: Structured Asset Securities Corporation, Mortgage Pass-Through Certificates, Series 2004-17XS

I, E. Todd Whittemore, Executive Vice President of Aurora Loan Services LLC (formerly known as 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 Asset Securities Corporation Mortgage Pass-Through Certificates Series 2004-17XS;

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 Trust 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 Trust 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 Trust 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:

U.S. Bank National Association, as TrusteeChase Manhattan Mortgage Corporation, as ServicerColonial Savings, F.A., as ServicerGreenpoint Mortgage Funding, Inc., as ServicerNational City Mortgage Co., as ServicerOcwen Federal Bank FSB, as ServicerThird Federal Savings & Loan Association of Cleveland, as ServicerWachovia Mortgage Corporation, as Servicer

Date:

March 29, 2005

Signature:

/s/ E. Todd Whittemore

Title:

Executive Vice President

Company:

Aurora Loan Services LLC (formerly known as Aurora Loan Services Inc.)

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