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

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

Commission File Number: 333-91334-25

Bear Stearns Asset Backed Securities Trust
Asset Backed Certificates
Series 2004-SD1

(Exact name of registrant as specified in its charter)

New York 54-2147339
(State or other jurisdiction of 54-2147340
incorporation or organization) (I.R.S. Employer
Identification No.)

c/o Wells Fargo Bank, N.A.
9062 Old Annapolis Road
Columbia, MD 21045
(Address of principal executive offices) (Zip Code)

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

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 ( 229.405 of this chapter) 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.

Not applicable.

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.

PART I

Item 1. Business.

Omitted.

Item 2. Properties.

See Item 15(a), Exhibits 99.1, 99.2, and 99.3, for information
provided in lieu of information required by Item 102 of
Regulation S-K.

Item 3. Legal Proceedings.

The registrant knows of no material pending legal proceedings
involving the trust created under the Pooling and Servicing
Agreement (the Trust), the Trustee, the Servicer or the
registrant with respect to the Trust other than routine
litigation incidental to the duties of the respective parties.

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

None.

PART II

Item 5. Market for registrant's Common Equity and Related Stockholder
Matters and Issuer Purchases of Equity Securities.

No established public trading market for the Certificates exists.

Records provided to the Trust by the DTC and the Trustee
indicate that as of December 31, 2004, the total number of holders
of record for the Series of Certificates is 17.

Item 6. Selected Financial Data.

Omitted.

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

Omitted.

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

Not applicable.

Item 8. Financial Statements and Supplementary Data.

See Item 15(a), Exhibits 99.1, 99.2, 99.3, for information
provided in lieu of information required by Item 302 of
Regulation S-K.

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.

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.

Not applicable.

Item 14. Principal Accounting Fees and Services.

Not applicable.

PART IV

Item 15. Exhibits, Financial Statement Schedules.

(a) Exhibits

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

(99.1) Annual Independent Accountants' Servicing Reports concerning
servicing activities.

<s> <c>
a) Bank of America, N.A., as Servicer <F1>
b) EMC Mortgage Corp, as Servicer <F1>
c) Washington Mutual Bank, F.A., as Servicer <F1>
d) Wells Fargo Bank, N.A., as Servicer <F1>

(99.2) Report of Management as to Compliance with Minimum Servicing
Standards.

<s> <c>
a) Bank of America, N.A., as Servicer <F1>
b) EMC Mortgage Corp, as Servicer <F1>
c) Washington Mutual Bank, F.A., as Servicer <F1>
d) Wells Fargo Bank, N.A., as Servicer <F1>

(99.3) Annual Statements of Compliance under the Pooling and Servicing
Agreements.

<s> <c>
a) Bank of America, N.A., as Servicer <F1>
b) EMC Mortgage Corp, as Servicer <F1>
c) Washington Mutual Bank, F.A., as Servicer <F1>
d) Wells Fargo Bank, N.A., as Servicer <F1>

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

(b) Not applicable.

(99.5) Reliance Certifications Mandated under the Pooling and Servicing
Agreement for the year ended December 31, 2004

<s> <c>
a) Bank of America, N.A., as Servicer <F2>
b) EMC Mortgage Corp, as Servicer <F2>
c) Washington Mutual Bank, F.A., as Servicer <F2>
d) Wells Fargo Bank, N.A., as Servicer <F2>

<F1> Filed herewith.

<F2> Certification has been received.

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:

Bear Stearns Asset Backed Securities Trust
Asset Backed Certificates
Series 2004-SD1
(Registrant)

Signed: Wells Fargo Bank, N.A. as Master Servicer

By: Dawn Hammond, Vice President

By: /s/ Dawn Hammond, Vice President

Dated: March 30, 2005

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.

(a)(i) No annual report is provided to the Certificateholders other than
with respect to aggregate principal and interest distributions.

(a)(ii) No proxy statement, form of proxy or other proxy soliciting
material has been sent to any Certificateholder with respect to any
annual or other meeting of Certificateholders.

Exhibit Index

Exhibit No.

Ex-31.1 Rule 13a-14(a)/15d-14(a) Certification

I, Dawn Hammond, 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 Bear Stearns Asset Backed Securities Trust Asset Backed
Certificates, Series 2004-SD1 Trust;

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 master
servicer under the pooling and servicing, or similar, agreement, and
based on upon my knowledge and the annual compliance review required
under that agreement, and except as disclosed in the reports, the
master 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:
Bank of America, N.A. as Servicer, EMC Mortgage Corp as Servicer,
Washington Mutual Bank, F.A. as Servicer.

Date: March 30, 2005

/s/ Dawn Hammond
Signature

Vice President
Title

EX-99.1 (a)
(Logo) PricewaterhouseCoopers

PricewaterhouseCoopers LLP
214 N. Tryon Street
Ste 3600
Charlotte NC 28202

Telephone (704) 344 7500
Facsimile (704) 344 4100

Report of Independent Accountants

To the Board of Directors and Shareholder of Bank of America, N.A.

We have examined managements assertion concerning the mortgage division of
Bank of America, N.A.s (the "Company"), an operating division of
Bank of America, N.A., compliance with the minimum servicing standards
identified in the Mortgage Bankers Association of Americas Uniform Single
Attestation Program for Mortgage Bankers ("USAP") as of and for the year ended
December 31, 2004 included in the accompanying management assertion (see
Exhibit 1). Management is responsible for the Companys compliance with those
minimum servicing standards. Our responsibility is to express an opinion on
managements assertion about the Companys 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 Companys 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 the Companys compliance with the minimum servicing
standards.

In our opinion, managements 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.

/s/ PriceWaterhouseCoopers LLP
March 11, 2005

Exhibit 1

Bank of America
(Logo)

Bank of America
475 CrossPoint Parkway
PO Box 9000
Getzville, NY 14068-9000

Managements Assertion Concerning Compliance
with USAP Minimum Servicing Standards

March 11, 2005

As of and for the year ended December 31, 2004, Bank of America, N.A. (the
"Company"), has complied in all material respects with the minimum servicing
standards set forth in the Mortgage Bankers Association of Americas Uniform
Single Attestation Program for Mortgage Bankers ("USAP").

As of and for this same period, the Company had in effect a fidelity bond and
errors and omissions policy in the amounts of $325,000,000 and $180,000,000,
respectively.

/s/ Floyd S. Robinson
Floyd S. Robinson
Senior Vice President
President Consumer Real Estate
Bank of America, N.A.

/s/ H. Randall Chestnut
H. Randall Chestnut
Senior Vice President
Bank of America, N.A.

/s/ Mike Kula
Mike Kula
Senior Vice President
Finance Executive
Bank of America, N.A.

/s/ Robert Caruso
Robert Caruso
Senior Vice President
National Servicing Executive
Bank of America, N.A.

/s/ J. Mark Hanson
J. Mark Hanson
Senior Vice President
Bank of America, N.A.

EX-99.1 (b)
(logo) Deloitte

Deloitte & Touche LLP
Two World Financial Center
New York, NY 10281-1414
USA

Tel: +1 212 436 2000
Fax: +1 212 436 5000
www.deloitte.com

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholder of
EMC Mortgage Corporation

We have examined EMC Mortgage Corporation's (the "Company") (a wholly owned
subsidiary of The Bear Stearns Companies Inc.) compliance with its established
minimum servicing standards described in the accompanying Management's
Assertion dated February 24, 2005, as of and for the year ended November 30,
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 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
standards.

Our examination disclosed the following material noncompliance in regards to
resolving reconciling items within ninety (90) calendar days of their original
identification, applicable to the Company during the year ended November 30,
2004. The reconciliations in three of the twenty custodial bank accounts
selected for testing included twenty three reconciling items which were
resolved after 90 calendar days from their original identification.

In our opinion, except for the material noncompliance described in the
preceding paragraph, the Company complied, in all material respects, with the
aforementioned minimum servicing standards as of and for the year ended
November 30, 2004 based on the criteria set forth in Appendix A.

/s/ Deloitte & Touche LLP

February 24, 2005

Member of
Deloitte Touche Tohmatsu

APPENDIX A

MINIMUM SERVICING STANDARDS AS SET FORTH IN THE MORTGAGE
BANKERS ASSOCIATION OF AMERICA'S UNIFORM SINGLE ATTESTATION
PROGRAM FOR MORTGAGE BANKERS

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:
* be mathematically accurate;
* be prepared within forty-five (45) calendar days after the cutoff date;
* be reviewed and approved by someone other than the person who prepared
the reconciliation; and
* 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 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 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 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. Unused 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 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 updated 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
(e.g., 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.

EX-99.1 (c)
(logo) Deloitte

Deloitte & Touche LLP
Suite 3300
925 Fourth Avenue
Seattle, WA 98104-1126
USA
Tel: *1 206 716 7000
www.deloitte.com

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors
Washington Mutual Bank, FA and Subsidiaries

We have examined management's assertion that Washington Mutual Bank, FA and
Subsidiaries (the "Company") has complied as of and for the year ended
December 31, 2004, with its established minimum servicing standards for single
family residential mortgages identified in the accompanying Management's
Assertion, dated March 7, 2005. 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, 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
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 based on the
criteria set forth in Appendix I.

/s/ Deloitte & Touche LLP

March 7, 2005

Member of
Deloitte Touche Tohmatsu

Washington Mutual

MANAGEMENT'S ASSERTION

As of and for the year ended December 31, 2004, Washington Mutual Bank, FA and
Subsidiaries (the "Company") has complied, in all material respects, with the
Company's established minimum servicing standards for single family residential
mortgages as set forth in 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 (as subsidiary of Washington Mutual,
Inc.) was covered by a fidelity bond in the amount of $110 million and errors
and omissions policy in the amount of $20 million.

/s/ Craig Chapman
Craig Chapman
President
Commercial Banking

/s/ Conrad Vasquez
Conrad Vasquez
Senior Vice President
Home Loans-Service Delivery

/s/ Dyan Beito
Dyan Beito
Division Executive
Service Delivery and Enterprise Contact Center

March 7, 2005

1201 3rd Avenue
Seattle, WA 98101

Washington Mutual

WASHINGTON MUTUAL BANK, FA AND SUBSIDIARIES

APPENDIX I: MINIMUM SERVICING STANDARDS FOR SINGLE FAMILY RESIDENTIAL
MORTGAGES AS SET FORTH IN THE MORTGAGE BANKERS ASSOCIATION OF
AMERICA'S UNIFORM SINGLE ATTESTATION PROGRAM FOR MORTGAGE BANKERS

Washington Mutual

WASHINGTON MUTUAL BANK, FA AND SUBSIDIARIES

APPENDIX I: MINIMUM SERVICING STANDARDS FOR SINGLE FAMILY RESIDENTIAL
MORTGAGES AS SET FORTH IN THE MORTGAGE BANKERS ASSOCIATION OF
AMERICA'S UNIFORM SINGLE ATTESTATION PROGRAM FOR MORTGAGE BANKERS

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:

* be mathematically accurate;

* be prepared within forty-five (45) calendar days after the cutoff date;

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

* 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 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 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 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.

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. Unused checks shall be safeguarded so as to prevent unauthorized access.

IV. INVESTOR ACCOUNTING AND REPORTING

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 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 updated 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
(e.g., illness or unemployment).

VII. INSURANCE POLICIES

1201 3rd Avenue
Seattle, WA 98101

EX-99.1 (d)
(logo) KPMG

KPMG LLP
2500 Ruan Center
666 Grand Avenue
Des Moines, IA 50309

Independent Accountants' Report

The Board of Directors
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.:

We have examined management's assertion, included in the accompanying
Assertion of Management of Wells Fargo Home Mortgage, a division of Wells
Fargo Bank, N.A. (the Company), that 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) 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.

/s/ KPMG LLP

February 23, 2005

EX-99.2 (a)
Exhibit I

Bank of America
(logo)

Bank of America
475 CrossPoint Parkway
PO Box 9000
Getzville, NY 14068.9000

Management's Assertion Concerning Compliance
with USAP Minimum Servicing Standards

March 11, 2005

As of and for the year ended December 31, 2004, Bank of America, N.A. (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 Program for Mortgage Bankers ("USAP").

As of and for this same period, the Company had in effect a fidelity bond and
errors and omissions policy in the amounts of $325,000,000 and $180,000,000,
respectively.

/s/ Floyd S. Robinson
Floyd S. Robinson
Senior Vice President
President Consumer Real Estate
Bank of America, N.A.

/s/ H. Randall Chestnut
H. Randall Chestnut
Senior Vice President
Bank of America, N.A.

/s/ Mike Kula
Mike Kula
Senior Vice President
Finance Executive
Bank of America, N.A.

/s/ Robert Caruso
Robert Caruso
Senior Vice President
National Servicing Executive
Bank of America, N.A.

/s/ J. Mark Hanson
J. Mark Hanson
Senior Vice President
Bank of America, N.A.

EX-99.2 (b)
(logo) EMC
Mortgage Corporation

February 24, 2005

MANAGEMENT'S ASSERTION

As of and for the year ended November 30, 2004, EMC Mortgage Corporation (the
"Company") (a wholly owned subsidiary of The Bear Stearns Companies, Inc.),
has complied, in all material respects, with the Company's established
minimum servicing standards, except as discussed below, for residential
mortgage loans as set forth in Appendix A (the "Standards"). The Standards
are based on the Mortgage Bankers Association of America's Uniform Single
Attestation Program for Mortgage Bankers.

During the year ended November 30, 2004, the Company determined it was
materially noncompliant with regards to resolving reconciling items within
ninety (90) calendar days of their original identification as specified by
its established minimum servicing standards. Twenty three reconciling items
in three of the twenty custodial bank account reconciliations selected for
testing during the accountants' examination were resolved after 90 calendar
days from their original identification.

As of and for this same period, the Company had in effect a fidelity bond in
the amount of $100,000,000 and $210,000,000 for the periods from December 1,
2003 to September 29, 2004 and from September 30, 2004 to November 30, 2004,
respectively, and an errors and omissions policy in the amount of $15,000,000
and $20,000,000 for the periods from December 1, 2003 to January 31, 2004 and
from February 1, 2004 to November 30, 2004, respectively.

/s/ Ralene Ruyle
Ralene Ruyle, President

/s/ Norton Wells
F. Norton Wells, Executive Vice President

/s/ Judith L. Leto
Judith L. Leto, CFO and Senior Vice President

Two MacArthur Ridge, 909 Hidden Ridge Drive, Suite 200, Irving, Texas 75038
Mailing Address: P.O. Box 141358 Irving, Texas 75014-1358

(logo) Mortgage Bankers Association
investing in communities
MEMBER 2004

APPENDIX A

MINIMUM SERVICING STANDARDS AS SET FORTH IN THE MORTGAGE
BANKERS ASSOCIATION OF AMERICA'S UNIFORM SINGLE ATTESTATION
PROGRAM FOR MORTGAGE BANKERS

I. CUSTODIAL BANK ACCOUNTS

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 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 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 business days to the mortgagor's or investor's records
maintained by the servicing entity.

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. Unused checks shall be safeguarded so as to prevent unauthorized access.

IV. INVESTOR ACCOUNTING AND REPORTING

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 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

VII.INSURANCE POLICIES

EX-99.2 (c)
Washington Mutual

MANAGEMENT'S ASSERTION

/s/ Craig Chapman
Craig Chapman
President
Commercial Banking

/s/ Conrad Vasquez
Conrad Vasquez
Senior Vice President
Home Loans-Service Delivery

/s/ Dyan Beito
Dyan Beito
Division Executive
Service Delivery and Enterprise Contact Center

March 7, 2005

1201 3rd Avenue
Seattle, WA 98101

Washington Mutual

WASHINGTON MUTUAL BANK, FA AND SUBSIDIARIES

APPENDIX I: MINIMUM SERVICING STANDARDS FOR SINGLE FAMILY RESIDENTIAL
MORTGAGES AS SET FORTH IN THE MORTGAGE BANKERS ASSOCIATION OF
AMERICA'S UNIFORM SINGLE ATTESTATION PROGRAM FOR MORTGAGE BANKERS

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:

* be mathematically accurate;

* be prepared within forty-five (45) calendar days after the cutoff date;

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

* 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 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 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 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.

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. Unused checks shall be safeguarded so as to prevent unauthorized access.

IV. INVESTOR ACCOUNTING AND REPORTING

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 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 updated 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
(e.g., illness or unemployment).

VII. INSURANCE POLICIES

1201 3rd Avenue
Seattle, WA 98101

EX-99.2 (d)
(logo) Wells Fargo Home Mortgage

1 Home Campus
Des Moines, IA 50328

Assertion of Management of Wells Fargo Home Mortgage, a division of Wells
Fargo Bank, N.A

As of and for the year ended December 31, 2004, Wells Fargo Home Mortgage, a
division of Wells Fargo Bank, N.A. (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 Program for
Mortgage Bankers.

As of and for this same period, the Company had in effect a fidelity bond
along with an errors and omissions policy in the amounts of $100 million and
$20 million, respectively.

/s/ Michael J. Heid
February 23, 2005
Michael J. Heid, Division President, Capital Markets, Finance, & Administration
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.

/s/ Franklin R. Codel
February 23. 2005
Franklin R. Codel, Executive Vice President, Finance and Corporate Real Estate
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.

/s/ Michael Lepore
February 23. 2005
Michael Lepore, Executive Vice President, Institutional Lending
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.

/s/ Mary Coffin
February 23, 2005
Mary Coffin, Executive Vice President, Servicing & Post Closing
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.

Wells Fargo Home Mortgage
Is a division of Wells Fargo Bank, N.A.

EX-99.3 (a)
BSABS 2004-SD1. BSABS 2004-SD2, BSALTA 2004-11

BANK OF AMERICA MORTGAGE SECURITIES, INC.
MORTGAGE PASS-THROUGH CERTIFICATES,
SERIES SET FORTH ON EXHIBIT 1 HERETO

OFFICER'S CERTIFICATE PURSUANT TO SECTION 11.20
OF THE AGREEMENTS LISTED ON EXHIBIT 1 HERETO

I, H. Randall Chestnut, Senior Vice President of Bank of America, N.A.,
(the "Servicer"), hereby certify pursuant to Section 11.20 of the Pooling
and Servicing Agreements listed on Exhibit 1 hereto (collectively, the
"Agreements") that: (a) a review of the activities of the Servicer during
calendar year 2004 and of the performance of the Servicer under the Agreements
has been made under my supervision, and (b) to the best of my knowledge, based
on such review, the Servicer has fulfilled all its obligations under the
Agreements throughout calendar year 2004.

Dated: March 15, 2005

BA MORTGAGE, LLC,
as Servicer

By: /s/ H. Randall Chestnut
Name: H. Randall Chestnut
Title: Senior Vice President

EXHIBIT 1
DEAL NAME DATE
1. BSABS 2004-SD1 03/30/2004
2. BSABS 2004-SD2 04/30/2004
3. BSALTA 2004-11 09/30/2004

EX-99.3 (b)
(logo) EMC
Mortgage corporation
Proven Performance

Wells Fargo Bank Minnesota, N.A.
9062 Old Annapolis Rd.
Columbia, MD 21045
Attention: Master Servicing

RE: Officer's Certificate

Dear Master Servicer:

The undersigned Officer certifies the following for the 2004 fiscal year:

(A) I have reviewed the activities and performance of the Servicer during
the preceding fiscal year under the terms of the Servicing Agreement,
Trust Agreement, Pooling and Servicing Agreement and/or Seller/Servicer
Guide and to the best of these Officers' knowledge, the Servicer has
fulfilled all of its duties, responsibilities or obligations under these
Agreements throughout such year, or, if there has been a default or
failure of the servicer to perform any of such duties, responsibilities
or obligations, a description of each default or failure and the nature
and status thereof has been reported to Wells Fargo Bank Minnesota, N.A;

(B) I have confirmed that the Servicer is currently an approved FNMA of
FHLMC servicer in good standing;

(C) I have confirmed that the Fidelity Bond, the Errors and Omissions
Insurance Policy and any other bonds required under the terms of the
Servicing Agreement, Trust Agreement, Pooling and Servicing Agreement
and/or Seller/Servicer Guide are in full force and effect;

(D) All premiums for each Hazard Insurance Policy, Flood Insurance Policy
(if applicable) and Primary Mortgage Insurance Policy (if applicable),
with respect to each Mortgaged Property, have been paid and that all such
insurance policies are in full force and effect;

(E) All real estate taxes, governmental assessments and any other expenses
accrued and due, that if not paid could result in a lien or encumbrance
on any Mortgaged Property, have been paid, or if any such costs or
expenses have not been paid with respect to any Mortgaged Property, the
reason for the non-payment has been reported to Wells Fargo Bank
Minnesota, N.A.;

(F) All Custodial Accounts have been reconciled and are properly funded; and

(G) All annual reports of Foreclosure and Abandonment of Mortgage Property
required per section 6050H, 6050J and 6050P of the Internal Revenue Code,
respectively, have been prepared and filed.

Certified by:

/s/ Sue Stepanek
Sue Stepanek
Executive Vice President

March 4, 2005
Date

Two MacArthur Ridge 909 Hidden Ridge Drive, Suite 200 Irving, Texas 75038
Mailing Address: P.O. Box 141358, Irving, Texas 75014-1358

(logo)
Member
Mortgage Bankers
Association of America

EX-99.3 (c)
OFFICER'S CERTIFICATE
ANNUAL STATEMENT OF COMPLIANCE

Reference is hereby made to Bear Stearns Asset Backed Securities Trust 2003-SD1,
2003-SD2, and 2004-SD1, Asset Backed Certificates, Series 2003-SD1, 2003-SD2,
and 2004-SD1 (the "Securitizations"). Washington Mutual Bank, FA (the
"Servicer") services mortgage loans in connection with the Securitizations
(the "Mortgage Loans") pursuant to the terms of that certain Servicing Agreement
dated as of June 1, 2003 between Washington Mutual Bank, FA (the "Servicer") and
EMC Mortgage Corporation (the "Owner") (as from time to time amended or replaced
by a reconstituted servicing or other successor servicing agreement, the
"Servicing Agreement").

I, Conrad Vasquez, an authorized officer of the Servicer, certify for the
benefit of the Master Servicer and the Trustee with respect to the calendar year
immediately preceding the date of this Officer's Certificate (the "Relevant
Year"), as follows:

1. A review of the activities of the Servicer during the Relevant Year and of
performance under the Servicing Agreement has been made under my
supervision;

2. To the best of my knowledge, based on such review, the Servicer has
fulfilled all of its obligations under the Servicing Agreement in all
material respects throughout the Relevant Year;

DATED as of March 11, 2005

Washington Mutual Bank, FA

By: /s/ Conrad Vasquez

Name: Conrad Vasquez
Title: Senior Vice President

EX-99.3 (d)
(logo) WELLS FARGO HOME MORTGAGE

Wells Fargo Home Mortgage
One Home Campus
Des Moines, IA 50328-0001

March 1, 2005

Re: 2004 Annual Certification

We hereby certify to the best of our knowledge and belief that for the
calendar year of 2004:

1. All real estate taxes, bonds assessments and other lienable items have
been paid.

2. All FHA mortgage insurance, private mortgage insurance premiums, and
flood insurance have been paid (if applicable).

3. Hazard insurance policies held by us meet the requirements as specified
in the servicing agreement, or those of a normal prudent lender if not
specified, and those premiums due have been paid.

4. We have made all property inspections as required.

5. Fidelity bond and Errors and Omissions insurance coverage currently
exists.

6. That the Officer signing this certificate has reviewed the activities
and performance of the Servicer during the preceding fiscal year under the
terms of the Servicing Agreement, Trust Agreement, Pooling and Servicing
Agreement and/or Seller/Servicer Guide or similar agreements and to the
best of this officer's knowledge, the Servicer has fulfilled all of its
duties, responsibilities or obligations of such agreement throughout the
year, or if there has been a default or failure of the servicer to perform
any of such duties, responsibilities or obligations, a description of each
default or failure and the nature and status thereof has been reported.

Sincerely,

/s/ John B. Brown

John B. Brown
Vice President
Wells Fargo Home Mortgage Inc.

Wells Fargo Home Mortgage
is a division of Wells Fargo Bank, N.A.

Ex-99.4

Schedule of Year-To-Date Principal and Interest Distributions to
Certificateholders

Class Interest Principal Losses Ending Balance
<s> <c> <c> <c> <c>
A-1 1,171,360.12 46,137,033.28 0.00 71,866,966.72
A-2 1,205,803.47 0.00 0.00 80,997,000.00
B 91,451.52 0.00 0.00 2,217,006.00
BIO 3,501,089.11 0.00 0.00 177,808,252.79
M-1 306,419.40 0.00 0.00 8,204,000.00
M-2 260,985.87 0.00 0.00 6,541,000.00
M-3 237,806.28 0.00 0.00 5,765,000.00
OC 0.00 0.00 0.00 2,217,280.07
R-1 0.00 50.00 0.00 0.00
R-2 0.00 50.00 0.00 0.00