<PAGE>

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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-K/A

[X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
      ACT OF 1934

FOR THE FISCAL YEAR ENDED: DECEMBER 31, 2004 OR

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

FOR THE TRANSITION PERIOD FROM __________ TO _________.

COMMISSION FILE NUMBER: 333-115296-05

SEQUOIA RESIDENTIAL FUNDING, INC. (AS DEPOSITOR UNDER THE POOLING AND SERVICING
AGREEMENT, DATED AUGUST 1, 2004, PROVIDING FOR THE ISSUANCE OF THE SEQUOIA
MORTGAGE TRUST 2004-8, MORTGAGE PASS-THROUGH CERTIFICATES)

                        SEQUOIA RESIDENTIAL FUNDING, INC.
             (Exact Name of registrant as specified in its charter)

            DELAWARE                                     35-2170972
(State or other jurisdiction of             (I.R.S. employer identification no.)
incorporation or organization)

           ONE BELVEDERE PLACE
                SUITE 330
             MILL VALLEY, CA                                    94941
(Address of principal executive offices)                      (Zip code)

                                 (415) 389-7373
              (Registrant's telephone number, including area code)

Securities registered pursuant to              Securities registered pursuant to
     Section 12(b) of the Act:                     Section 12(g) of the Act:

               NONE                                            NONE
         (Title of class)                                (Title of class)

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 stock held by non-affiliates of
Registrant. The aggregate market value shall be computed by reference to the
price at which the stock was sold, or the average bid and asked prices of such
stock, as of the last business day of the Registrant's most recently completed
second fiscal quarter:

                                 NOT APPLICABLE

                      Documents incorporated by reference:

                                 NOT APPLICABLE

<PAGE>

                        SEQUOIA RESIDENTIAL FUNDING, INC.
        SEQUOIA MORTGAGE TRUST 2004-8, MORTGAGE PASS-THROUGH CERTIFICATES

                                      INDEX

<TABLE>
<CAPTION>
                                                                                                                      Page
                                                                                                                      ----
<S>                                                                                                                   <C>
PART I       .....................................................................................................      3
             ITEM 1   -  BUSINESS.................................................................................      3
             ITEM 2   -  PROPERTIES...............................................................................      3
             ITEM 3   -  LEGAL PROCEEDINGS........................................................................      3
             ITEM 4   -  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS......................................      3

PART II      .....................................................................................................      3
             ITEM 5   -  MARKET FOR REGISTRANT'S COMMON STOCK, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES
                         OF EQUITY SECURITIES.....................................................................      3
             ITEM 6   -  SELECTED FINANCIAL DATA..................................................................      3
             ITEM 7   -  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS....      3
             ITEM 7A  -  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK...............................      3
             ITEM 8   -  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA..............................................      3
             ITEM 9   -  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE.....      3
             ITEM 9A  -  CONTROLS AND PROCEDURES..................................................................      4
             ITEM 9B  -  OTHER INFORMATION........................................................................      4

PART III     .....................................................................................................      4
             ITEM 10  -  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.......................................      4
             ITEM 11  -  EXECUTIVE COMPENSATION...................................................................      4
             ITEM 12  -  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT...........................      4
             ITEM 13  -  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS...........................................      5
             ITEM 14  -  PRINCIPAL ACCOUNTANT FEES AND SERVICES...................................................      5

PART IV      .....................................................................................................      6
             ITEM 15  -  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K..........................      6

SIGNATURES   .....................................................................................................      8

CERTIFICATION.....................................................................................................      9

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............................................     10

INDEX TO EXHIBITS ................................................................................................     10
</TABLE>

                                       2

<PAGE>

                                     PART I

ITEM 1 -    BUSINESS

            Not Applicable.

ITEM 2 -    PROPERTIES

            Sequoia Residential Funding, Inc. (the "Depositor") will furnish
information regarding the Mortgaged Properties by reference to the Annual
Compliance Certificates to be filed herein under Item 15.

ITEM 3 -    LEGAL PROCEEDINGS

            The Depositor is not aware of any material pending legal proceedings
involving either the Mortgage Pass-Through Certificates, the Sequoia Mortgage
2004-8 Trust (the "Trust); the Pooling and Servicing Agreement; the Trustee; the
Depositor; the Seller; the Master Servicer or the Servicers which relates to the
Trust.

ITEM 4 -    SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

            No matter has been submitted to a vote of the holders of beneficial
interests in the Trust through the solicitation of proxies or otherwise.

                                     PART II

ITEM 5 -    MARKET FOR REGISTRANT'S COMMON STOCK, RELATED STOCKHOLDER MATTERS
            AND ISSUER PURCHASES OF EQUITY SECURITIES

            To the best knowledge of the Depositor, there is no established
public trading market for the Certificates.

            The Certificates issued by the Trust are held by the Depository
Trust Company ("DTC") which in turn maintains records of holders of beneficial
interests in the Certificates. Based on information obtained by the Trust from
DTC, as of December 31, 2004, there were seven (7) holders of the Class A-1
Certificates, thirteen (13) holders of the Class A-2 Certificates, four (4)
holders of the Class X-A Certificates, one (1) holder of the Class X-B
Certificates, two (2) holders of the Class B-1 Certificates, one (1) holder of
the Class B-2 Certificates, and one (1) holder of the Class B-3 Certificates.

ITEM 6 -    SELECTED FINANCIAL DATA

            Not Applicable.

ITEM 7 -    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
            RESULTS OF OPERATIONS

            Not Applicable.

ITEM 7A -   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

            Not Applicable.

ITEM 8 -    FINANCIAL STATEMENTS AND SUPPLEMENTARY INFORMATION

            Not Applicable.

ITEM 9 -    CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
            FINANCIAL DISCLOSURE

            There were no changes of accountants or disagreements on accounting
or financial disclosures between the Depositor and its accountants.

                                       3

<PAGE>

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

            The Depositor is a Delaware corporation and indirect wholly-owned
subsidiary of Redwood Trust, Inc. The Trust is a grantor trust established under
the Pooling and Servicing Agreement.

            The following table sets forth (i) the identification of each entity
owning more than 5% of the outstanding principal amount of each class of the
Pass-Through Certificates; (ii) the principal amount of each class of the
Pass-Through Certificates owned by each and (iii) the percent that the principal
amount of each class of the Pass-Through Certificates owned by such entity
represents of the outstanding principal amount of such class of Pass-Through
Certificates. The information set forth in the table for the Certificates is
based upon information obtained by the Trust from DTC and represents ownership
of beneficial interest in the Certificates held by DTC. The Depositor is not
aware of any Schedules 13D or 13G filed with the Securities and Exchange
Commission in respect of the Certificates.

CLASS A-1

<TABLE>
<CAPTION>
Identification    Principal Amount Owned    Percentage of Outstanding Amount
--------------    ----------------------    --------------------------------
<S>               <C>                       <C>
BANK OF NY              $164,000,000                    44.93%
FORTIS LLC              $ 50,000,000                    13.70%
JPMCBNA                 $ 30,000,000                     8.22%
CITIBANK                $ 20,000,000                     5.48%

MELLON TR               $ 99,200,000                    27.17%
</TABLE>

CLASS A-2

<TABLE>
<CAPTION>
Identification    Principal Amount Owned    Percentage of Outstanding Amount
--------------    ----------------------    --------------------------------
<S>               <C>                       <C>
BANK OF NY              $30,810,000                      7.37%
DRESDNER                $25,000,000                      5.98%
ML SFKPG                $65,000,000                     15.56%
SG AMERICA              $25,000,000                      5.98%
JPMCBNA                 $29,500,000                      7.06%

SSB&T                   $85,770,000                     20.52%
</TABLE>

                                       4

<PAGE>

CLASS X-A

<TABLE>
<CAPTION>
Identification    Principal Amount Owned    Percentage of Outstanding Amount
--------------    ----------------------    --------------------------------
<S>               <C>                       <C>
BANC OF AM              $ 79,884,201                    10.20%
MERRIL                  $383,570,709                    48.98%
BEAR STERN              $ 83,001,000                    10.60%
LHMNGV/LBI              $236,643,090                    30.22%
</TABLE>

CLASS X-B

<TABLE>
<CAPTION>
Identification    Principal Amount Owned    Percentage of Outstanding Amount
--------------    ----------------------    --------------------------------
<S>               <C>                       <C>
CITIBANK                $24,600,000                     100.00%
</TABLE>

CLASS B-1

<TABLE>
<CAPTION>
Identification    Principal Amount Owned    Percentage of Outstanding Amount
--------------    ----------------------    --------------------------------
<S>               <C>                       <C>
BANK OF NY              $8,200,000                         50%
JPMCBNA                 $8,200,000                         50%
</TABLE>

CLASS B-2

<TABLE>
<CAPTION>
Identification    Principal Amount Owned    Percentage of Outstanding Amount
--------------    ----------------------    --------------------------------
<S>               <C>                       <C>
BANK OF NY              $8,200,000                        100%
</TABLE>

CLASS B-3

<TABLE>
<CAPTION>
Identification    Principal Amount Owned    Percentage of Outstanding Amount
--------------    ----------------------    --------------------------------
<S>               <C>                       <C>
WELLS BKNA              $4,100,000                      100.00%
</TABLE>

ITEM 13 -   CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

            None.

ITEM 14     PRINCIPAL ACCOUNTANT FEES AND SERVICES

            Not Applicable.

                                       5

<PAGE>

                                     PART IV

ITEM 15 -   EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

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

                  1.    Financial Statements:

                        Not applicable.

                  2.    Financial Statement Schedules:

                        Not applicable.

                  3.    Exhibits:

<TABLE>
<CAPTION>
Exhibit No.                               Description
-----------                               -----------
<S>                     <C>
31.1                    Sarbanes-Oxley Certification.

99.1                    Statement of Compliance of the Servicer pursuant to
                        Section 7.04(a) of The Master Servicing Agreement
                        between RWT Holdings, Inc. ("RWT") and Morgan Stanley
                        Dean Witter Credit Corporation, dated August 1, 2002, as
                        modified by the related Acknowledgements (the
                        "RWT/Morgan Servicing Agreement").

99.2                    Report of Independent Accountant pursuant to Section
                        7.04(b) of the RWT/Morgan Servicing Agreement.

99.3                    Statement of Compliance of the Servicer pursuant to
                        Section 6.04 of The Mortgage Loan Flow Purchase, Sale
                        and Servicing Agreement, dated as of August 1, 2002,
                        between RWT and GreenPoint Mortgage Funding, Inc., as
                        modified by the related Acknowledgements (the
                        "RWT/GreenPoint Servicing Agreement").

99.4                    Report of Independent Account pursuant to Section 6.05
                        of the RWT/GreenPoint Servicing Agreement.

99.5                    Statement of Compliance of the Servicer pursuant to
                        Section 7.04 of The Mortgage Loan Flow Purchase, Sale &
                        Servicing Agreement among RWT, Cendant Mortgage
                        Corporation ("Cendant") and Bishop's Gate Residential
                        Mortgage Trust (formerly known as Cendant Residential
                        Mortgage Trust), as Sellers, and Cendant, as Servicer,
                        dated August 1, 2002, as modified by the related
                        Acknowledgements (the "RWT/Cendant Servicing
                        Agreement").

99.6                    Report of Independent Accountant pursuant to Section
                        7.05 of the RWT/Cendant Servicing Agreement.

99.7                    Statement of Compliance of the Servicer pursuant to
                        Section 11.20 of the Flow Mortgage Loan Sale and
                        Servicing Agreement, dated as of April 1, 2003, between
                        RWT and Bank of America, N.A., as modified by the
                        related Acknowledgements (the "RWT/Bank of America
                        Servicing Agreement").

99.8                    Report of Independent Accountant pursuant to Section
                        11.21 of the RWT/Bank of America Servicing Agreement.

99.9                    Statement of Compliance of the Servicer pursuant to
                        Section 6.04 of
</TABLE>

                                       6

<PAGE>

<TABLE>
<S>                     <C>
                        the Loan Servicing Agreement, dated as of February 1,
                        2004 between RWT and GMAC Mortgage Corporation, as
                        modified by the related Acknowledgements (the "RWT/GMAC
                        Servicing Agreement").

99.10                   Report of Independent Accountant pursuant to Section
                        6.05 of the RWT/GMAC Servicing Agreement.
</TABLE>

(b)   Reports on Form 8-K field during the last quarter of the period covered by
      this report.

<TABLE>
<CAPTION>
DATE OF REPORTS ON FORM 8-K   ITEMS REPORTED/FINANCIAL STATEMENTS FILED
<S>                           <C>
August 27, 2004               Report filing Computational Materials and
                              Collateral Term Sheet

September 15, 2004            Report filing the Pooling and Servicing Agreement
                              and the Tax Opinion

October 6, 2004               Trustee's Monthly Report for the September
                              Distribution to Certificateholders

November 5, 2004              Trustee's Monthly Report for the October
                              Distribution to Certificateholders

December 3, 2004              Trustee's Monthly Report for the November
                              Distribution to Certificateholders

January 5, 2005               Trustee's Monthly Report for the December
                              Distribution to Certificateholders
</TABLE>

                                       7

<PAGE>

                                   SIGNATURES

      Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Depositor has duly caused this Report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                   SEQUOIA RESIDENTIAL FUNDING, INC.

                                    By: /s/ Harold F. Zagunis
                                        ----------------------------------------
                                    Name: Harold F. Zagunis
                                    Title: Chief Financial Officer and Secretary

Date: May 31, 2005.

                                       8

<PAGE>

                                  CERTIFICATION

      I, Harold F. Zagunis, Chief Financial Officer and Secretary of Sequoia
Residential Funding, Inc., a Delaware corporation, hereby certify that:

      1. I have reviewed this annual report on Form 10-K/A, and all reports on
Form 8-K containing distribution or servicing reports filed in respect of the
Certificates for periods included in the year covered by this annual report, of
Sequoia Residential Funding, Inc.;

      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 agreement, for inclusion in these reports is included in these
reports;

      4. Based on my knowledge and upon the annual compliance statement included
in the report and required to be delivered to the trustee in accordance with the
terms of the pooling and servicing agreement, and except as disclosed in the
reports, the servicer has fulfilled its obligations under the servicing
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 Attestation Program for Mortgage Bankers or similar
procedure, as set forth in the pooling and servicing 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: Morgan Stanley
Dean Witter Credit Corporation, as Servicer, GreenPoint Mortgage Funding, Inc.,
as Servicer, Cendant Mortgage Corporation, as Servicer, Bank of America, N.A.,
as Servicer, and GMAC Mortgage Corporation, as Servicer.

Date: May 31, 2005

/s/ Harold F. Zagunis
---------------------------------------------
Signature
Name: Harold F. Zagunis
Title: Chief Financial Officer and Secretary

                                       9

<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.

      No annual report, proxy statement, proxy materials or otherwise were sent
to Certificateholders.

                               INDEX TO EXHIBITS
                                   Item 15(C)

<TABLE>
<CAPTION>
Exhibit No.                               Description
-----------                               -----------
<S>               <C>
31.1              Sarbanes-Oxley Certification.

99.1              Statement of Compliance of the Servicer pursuant to Section
                  7.04(a) of The Master Servicing Agreement between RWT
                  Holdings, Inc. ("RWT") and Morgan Stanley Dean Witter Credit
                  Corporation, dated August 1, 2002, as modified by the related
                  Acknowledgements (the "RWT/ Morgan Servicing Agreement").

99.2              Report of Independent Accountant pursuant to Section 7.04(b)
                  of the RWT/Morgan Servicing Agreement.

99.3              Statement of Compliance of the Servicer pursuant to Section
                  6.04 of The Mortgage Loan Flow Purchase, Sale and Servicing
                  Agreement, dated as of August 1, 2002, between RWT and
                  GreenPoint Mortgage Funding, Inc., as modified by the related
                  Acknowledgements (the "RWT/GreenPoint Servicing Agreement").

99.4              Report of Independent Account pursuant to Section 6.05 of
                  RWT/GreenPoint Servicing Agreement.

99.5              Statement of Compliance of the Servicer pursuant to Section
                  7.04 of The Mortgage Loan Flow Purchase, Sale & Servicing
                  Agreement among RWT, Cendant Mortgage Corporation ("Cendant")
                  and Bishop's Gate Residential Mortgage Trust (formerly known
                  as Cendant Residential Mortgage Trust), as Sellers, and
                  Cendant, as Servicer, dated August 1, 2002, as modified by the
                  related Acknowledgements (the "RWT/Cendant Servicing
                  Agreement").

99.6              Report of Independent Accountant pursuant to Section 7.05 of
                  the RWT/Cendant Servicing Agreement.

99.7              Statement of Compliance of the Servicer pursuant to Section
                  11.20 of the Flow Mortgage Loan Sale and Servicing Agreement,
                  dated as of April 1, 2003, between RWT and Bank of America,
                  N.A., as modified by the related Acknowledgements (the
                  "RWT/Bank of America Servicing Agreement").

99.8              Report of Independent Accountant pursuant to Section 11.21 of
                  the RWT/Bank of America Servicing Agreement.

99.9              Statement of Compliance of the Servicer pursuant to Section
                  6.04 of the Loan Servicing Agreement, dated as of February 1,
                  2004, between RWT and GMAC Mortgage Corporation, as modified
                  by the related Acknowledgements (the "RWT/GMAC Servicing
                  Agreement").
</TABLE>

                                       10

<PAGE>

99.10             Report of Independent Accountant pursuant to Section 6.05 of
                  the RWT/GMAC Servicing Agreement.

                                       11